Fix regression in HTML handling (telegram). Closes #734

* Revert back to blackfriday v1
* Add testing

18 files changed, 2311 insertions, 2533 deletions

diff --git a/vendor/github.com/russross/blackfriday/.travis.yml b/vendor/github.com/russross/blackfriday/.travis.yml
index a4eb2577..2f3351d7 100644
--- a/vendor/github.com/russross/blackfriday/.travis.yml
+++ b/vendor/github.com/russross/blackfriday/.travis.yml
@@ -1,18 +1,17 @@
-# Travis CI (http://travis-ci.org/) is a continuous integration service for
-# open source projects. This file configures it to run unit tests for
-# blackfriday.
-
+sudo: false
 language: go
-
 go:
-    - 1.5
-    - 1.6
-    - 1.7
-
+  - "1.9.x"
+  - "1.10.x"
+  - tip
+matrix:
+  fast_finish: true
+  allow_failures:
+    - go: tip
 install:
-    - go get -d -t -v ./...
-    - go build -v ./...
-
+  - # Do nothing. This is needed to prevent default install action "go get -t -v ./..." from happening here (we want it to happen inside script step).
 script:
-    - go test -v ./...
-    - go test -run=^$ -bench=BenchmarkReference -benchmem
+  - go get -t -v ./...
+  - diff -u <(echo -n) <(gofmt -d -s .)
+  - go tool vet .
+  - go test -v -race ./...
diff --git a/vendor/github.com/russross/blackfriday/README.md b/vendor/github.com/russross/blackfriday/README.md
index 2e0db355..3c62e137 100644
--- a/vendor/github.com/russross/blackfriday/README.md
+++ b/vendor/github.com/russross/blackfriday/README.md
@@ -1,4 +1,6 @@
-Blackfriday [![Build Status](https://travis-ci.org/russross/blackfriday.svg?branch=master)](https://travis-ci.org/russross/blackfriday)
+Blackfriday
+[![Build Status][BuildSVG]][BuildURL]
+[![Godoc][GodocV2SVG]][GodocV2URL]
 ===========
 
 Blackfriday is a [Markdown][1] processor implemented in [Go][2]. It
@@ -16,27 +18,27 @@ It started as a translation from C of [Sundown][3].
 Installation
 ------------
 
-Blackfriday is compatible with any modern Go release. With Go 1.7 and git
-installed:
+Blackfriday is compatible with any modern Go release. With Go and git installed:
 
-    go get gopkg.in/russross/blackfriday.v2
+    go get -u gopkg.in/russross/blackfriday.v2
 
-will download, compile, and install the package into your `$GOPATH`
-directory hierarchy. Alternatively, you can achieve the same if you
-import it into a project:
-
-    import "gopkg.in/russross/blackfriday.v2"
-
-and `go get` without parameters.
+will download, compile, and install the package into your `$GOPATH` directory
+hierarchy.
 
 
 Versions
 --------
 
 Currently maintained and recommended version of Blackfriday is `v2`. It's being
-developed on its own branch: https://github.com/russross/blackfriday/v2. You
-should install and import it via [gopkg.in][6] at
-`gopkg.in/russross/blackfriday.v2`.
+developed on its own branch: https://github.com/russross/blackfriday/tree/v2 and the
+documentation is available at
+https://godoc.org/gopkg.in/russross/blackfriday.v2.
+
+It is `go get`-able via [gopkg.in][6] at `gopkg.in/russross/blackfriday.v2`,
+but we highly recommend using package management tool like [dep][7] or
+[Glide][8] and make use of semantic versioning. With package management you
+should import `github.com/russross/blackfriday` and specify that you're using
+version 2.0.0.
 
 Version 2 offers a number of improvements over v1:
 
@@ -56,9 +58,43 @@ Potential drawbacks:
   v2. See issue [#348](https://github.com/russross/blackfriday/issues/348) for
   tracking.
 
+If you are still interested in the legacy `v1`, you can import it from
+`github.com/russross/blackfriday`. Documentation for the legacy v1 can be found
+here: https://godoc.org/github.com/russross/blackfriday
+
+### Known issue with `dep`
+
+There is a known problem with using Blackfriday v1 _transitively_ and `dep`.
+Currently `dep` prioritizes semver versions over anything else, and picks the
+latest one, plus it does not apply a `[[constraint]]` specifier to transitively
+pulled in packages. So if you're using something that uses Blackfriday v1, but
+that something does not use `dep` yet, you will get Blackfriday v2 pulled in and
+your first dependency will fail to build.
+
+There are couple of fixes for it, documented here:
+https://github.com/golang/dep/blob/master/docs/FAQ.md#how-do-i-constrain-a-transitive-dependencys-version
+
+Meanwhile, `dep` team is working on a more general solution to the constraints
+on transitive dependencies problem: https://github.com/golang/dep/issues/1124.
+
+
 Usage
 -----
 
+### v1
+
+For basic usage, it is as simple as getting your input into a byte
+slice and calling:
+
+    output := blackfriday.MarkdownBasic(input)
+
+This renders it with no extensions enabled. To get a more useful
+feature set, use this instead:
+
+    output := blackfriday.MarkdownCommon(input)
+
+### v2
+
 For the most sensible markdown processing, it is as simple as getting your input
 into a byte slice and calling:
 
@@ -85,7 +121,7 @@ Here's an example of simple usage of Blackfriday together with Bluemonday:
 ```go
 import (
     "github.com/microcosm-cc/bluemonday"
-    "github.com/russross/blackfriday"
+    "gopkg.in/russross/blackfriday.v2"
 )
 
 // ...
@@ -93,11 +129,21 @@ unsafe := blackfriday.Run(input)
 html := bluemonday.UGCPolicy().SanitizeBytes(unsafe)
 ```
 
-### Custom options
+### Custom options, v1
+
+If you want to customize the set of options, first get a renderer
+(currently only the HTML output engine), then use it to
+call the more general `Markdown` function. For examples, see the
+implementations of `MarkdownBasic` and `MarkdownCommon` in
+`markdown.go`.
+
+### Custom options, v2
 
 If you want to customize the set of options, use `blackfriday.WithExtensions`,
 `blackfriday.WithRenderer` and `blackfriday.WithRefOverride`.
 
+### `blackfriday-tool`
+
 You can also check out `blackfriday-tool` for a more complete example
 of how to use it. Download and install it using:
 
@@ -117,6 +163,22 @@ installed in `$GOPATH/bin`.  This is a statically-linked binary that
 can be copied to wherever you need it without worrying about
 dependencies and library versions.
 
+### Sanitized anchor names
+
+Blackfriday includes an algorithm for creating sanitized anchor names
+corresponding to a given input text. This algorithm is used to create
+anchors for headings when `EXTENSION_AUTO_HEADER_IDS` is enabled. The
+algorithm has a specification, so that other packages can create
+compatible anchor names and links to those anchors.
+
+The specification is located at https://godoc.org/github.com/russross/blackfriday#hdr-Sanitized_Anchor_Names.
+
+[`SanitizedAnchorName`](https://godoc.org/github.com/russross/blackfriday#SanitizedAnchorName) exposes this functionality, and can be used to
+create compatible links to the anchor names generated by blackfriday.
+This algorithm is also implemented in a small standalone package at
+[`github.com/shurcooL/sanitized_anchor_name`](https://godoc.org/github.com/shurcooL/sanitized_anchor_name). It can be useful for clients
+that want a small package and don't need full functionality of blackfriday.
+
 
 Features
 --------
@@ -184,7 +246,7 @@ implements the following extensions:
     and supply a language (to make syntax highlighting simple). Just
     mark it like this:
 
-        ```go
+        ``` go
         func getTrue() bool {
             return true
         }
@@ -193,6 +255,15 @@ implements the following extensions:
     You can use 3 or more backticks to mark the beginning of the
     block, and the same number to mark the end of the block.
 
+    To preserve classes of fenced code blocks while using the bluemonday
+    HTML sanitizer, use the following policy:
+
+    ``` go
+    p := bluemonday.UGCPolicy()
+    p.AllowAttrs("class").Matching(regexp.MustCompile("^language-[a-zA-Z0-9]+$")).OnElements("code")
+    html := p.SanitizeBytes(unsafe)
+    ```
+
 *   **Definition lists**. A simple definition list is made of a single-line
     term followed by a colon and the definition for that term.
 
@@ -218,8 +289,10 @@ implements the following extensions:
 *   **Strikethrough**. Use two tildes (`~~`) to mark text that
     should be crossed out.
 
-*   **Hard line breaks**. With this extension enabled newlines in the input
-    translate into line breaks in the output. This extension is off by default.
+*   **Hard line breaks**. With this extension enabled (it is off by
+    default in the `MarkdownBasic` and `MarkdownCommon` convenience
+    functions), newlines in the input translate into line breaks in
+    the output.
 
 *   **Smart quotes**. Smartypants-style punctuation substitution is
     supported, turning normal double- and single-quote marks into
@@ -258,15 +331,21 @@ are a few of note:
 *   [LaTeX output](https://bitbucket.org/ambrevar/blackfriday-latex):
     renders output as LaTeX.
 
+*   [bfchroma](https://github.com/Depado/bfchroma/): provides convenience
+    integration with the [Chroma](https://github.com/alecthomas/chroma) code
+    highlighting library. bfchroma is only compatible with v2 of Blackfriday and
+    provides a drop-in renderer ready to use with Blackfriday, as well as
+    options and means for further customization.
+
 
-Todo
+TODO
 ----
 
 *   More unit testing
-*   Improve unicode support. It does not understand all unicode
+*   Improve Unicode support. It does not understand all Unicode
     rules (about what constitutes a letter, a punctuation symbol,
     etc.), so it may fail to detect word boundaries correctly in
-    some instances. It is safe on all utf-8 input.
+    some instances. It is safe on all UTF-8 input.
 
 
 License
@@ -281,3 +360,10 @@ License
    [4]: https://godoc.org/gopkg.in/russross/blackfriday.v2#Parse "Parse func"
    [5]: https://github.com/microcosm-cc/bluemonday "Bluemonday"
    [6]: https://labix.org/gopkg.in "gopkg.in"
+   [7]: https://github.com/golang/dep/ "dep"
+   [8]: https://github.com/Masterminds/glide "Glide"
+
+   [BuildSVG]: https://travis-ci.org/russross/blackfriday.svg?branch=master
+   [BuildURL]: https://travis-ci.org/russross/blackfriday
+   [GodocV2SVG]: https://godoc.org/gopkg.in/russross/blackfriday.v2?status.svg
+   [GodocV2URL]: https://godoc.org/gopkg.in/russross/blackfriday.v2
diff --git a/vendor/github.com/russross/blackfriday/block.go b/vendor/github.com/russross/blackfriday/block.go
index d7da33f2..45c21a6c 100644
--- a/vendor/github.com/russross/blackfriday/block.go
+++ b/vendor/github.com/russross/blackfriday/block.go
@@ -15,26 +15,18 @@ package blackfriday
 
 import (
 	"bytes"
-	"html"
-	"regexp"
-
-	"github.com/shurcooL/sanitized_anchor_name"
-)
-
-const (
-	charEntity = "&(?:#x[a-f0-9]{1,8}|#[0-9]{1,8}|[a-z][a-z0-9]{1,31});"
-	escapable  = "[!\"#$%&'()*+,./:;<=>?@[\\\\\\]^_`{|}~-]"
-)
-
-var (
-	reBackslashOrAmp      = regexp.MustCompile("[\\&]")
-	reEntityOrEscapedChar = regexp.MustCompile("(?i)\\\\" + escapable + "|" + charEntity)
+	"strings"
+	"unicode"
 )
 
 // Parse block-level data.
 // Note: this function and many that it calls assume that
 // the input buffer ends with a newline.
-func (p *Markdown) block(data []byte) {
+func (p *parser) block(out *bytes.Buffer, data []byte) {
+	if len(data) == 0 || data[len(data)-1] != '\n' {
+		panic("block input is missing terminating newline")
+	}
+
 	// this is called recursively: enforce a maximum depth
 	if p.nesting >= p.maxNesting {
 		return
@@ -43,14 +35,14 @@ func (p *Markdown) block(data []byte) {
 
 	// parse out one block-level construct at a time
 	for len(data) > 0 {
-		// prefixed heading:
+		// prefixed header:
 		//
-		// # Heading 1
-		// ## Heading 2
+		// # Header 1
+		// ## Header 2
 		// ...
-		// ###### Heading 6
-		if p.isPrefixHeading(data) {
-			data = data[p.prefixHeading(data):]
+		// ###### Header 6
+		if p.isPrefixHeader(data) {
+			data = data[p.prefixHeader(out, data):]
 			continue
 		}
 
@@ -60,7 +52,7 @@ func (p *Markdown) block(data []byte) {
 		//     ...
 		// </div>
 		if data[0] == '<' {
-			if i := p.html(data, true); i > 0 {
+			if i := p.html(out, data, true); i > 0 {
 				data = data[i:]
 				continue
 			}
@@ -71,9 +63,9 @@ func (p *Markdown) block(data []byte) {
 		// % stuff
 		// % more stuff
 		// % even more stuff
-		if p.extensions&Titleblock != 0 {
+		if p.flags&EXTENSION_TITLEBLOCK != 0 {
 			if data[0] == '%' {
-				if i := p.titleBlock(data, true); i > 0 {
+				if i := p.titleBlock(out, data, true); i > 0 {
 					data = data[i:]
 					continue
 				}
@@ -95,13 +87,13 @@ func (p *Markdown) block(data []byte) {
 		//         return b
 		//      }
 		if p.codePrefix(data) > 0 {
-			data = data[p.code(data):]
+			data = data[p.code(out, data):]
 			continue
 		}
 
 		// fenced code block:
 		//
-		// ``` go
+		// ``` go info string here
 		// func fact(n int) int {
 		//     if n <= 1 {
 		//         return n
@@ -109,8 +101,8 @@ func (p *Markdown) block(data []byte) {
 		//     return n * fact(n-1)
 		// }
 		// ```
-		if p.extensions&FencedCode != 0 {
-			if i := p.fencedCodeBlock(data, true); i > 0 {
+		if p.flags&EXTENSION_FENCED_CODE != 0 {
+			if i := p.fencedCodeBlock(out, data, true); i > 0 {
 				data = data[i:]
 				continue
 			}
@@ -124,9 +116,9 @@ func (p *Markdown) block(data []byte) {
 		// or
 		// ______
 		if p.isHRule(data) {
-			p.addBlock(HorizontalRule, nil)
+			p.r.HRule(out)
 			var i int
-			for i = 0; i < len(data) && data[i] != '\n'; i++ {
+			for i = 0; data[i] != '\n'; i++ {
 			}
 			data = data[i:]
 			continue
@@ -137,7 +129,7 @@ func (p *Markdown) block(data []byte) {
 		// > A big quote I found somewhere
 		// > on the web
 		if p.quotePrefix(data) > 0 {
-			data = data[p.quote(data):]
+			data = data[p.quote(out, data):]
 			continue
 		}
 
@@ -147,8 +139,8 @@ func (p *Markdown) block(data []byte) {
 		// ------|-----|---------
 		// Bob   | 31  | 555-1234
 		// Alice | 27  | 555-4321
-		if p.extensions&Tables != 0 {
-			if i := p.table(data); i > 0 {
+		if p.flags&EXTENSION_TABLES != 0 {
+			if i := p.table(out, data); i > 0 {
 				data = data[i:]
 				continue
 			}
@@ -161,7 +153,7 @@ func (p *Markdown) block(data []byte) {
 		//
 		// also works with + or -
 		if p.uliPrefix(data) > 0 {
-			data = data[p.list(data, 0):]
+			data = data[p.list(out, data, 0):]
 			continue
 		}
 
@@ -170,7 +162,7 @@ func (p *Markdown) block(data []byte) {
 		// 1. Item 1
 		// 2. Item 2
 		if p.oliPrefix(data) > 0 {
-			data = data[p.list(data, ListTypeOrdered):]
+			data = data[p.list(out, data, LIST_TYPE_ORDERED):]
 			continue
 		}
 
@@ -182,62 +174,55 @@ func (p *Markdown) block(data []byte) {
 		//
 		// Term 2
 		// :   Definition c
-		if p.extensions&DefinitionLists != 0 {
+		if p.flags&EXTENSION_DEFINITION_LISTS != 0 {
 			if p.dliPrefix(data) > 0 {
-				data = data[p.list(data, ListTypeDefinition):]
+				data = data[p.list(out, data, LIST_TYPE_DEFINITION):]
 				continue
 			}
 		}
 
 		// anything else must look like a normal paragraph
-		// note: this finds underlined headings, too
-		data = data[p.paragraph(data):]
+		// note: this finds underlined headers, too
+		data = data[p.paragraph(out, data):]
 	}
 
 	p.nesting--
 }
 
-func (p *Markdown) addBlock(typ NodeType, content []byte) *Node {
-	p.closeUnmatchedBlocks()
-	container := p.addChild(typ, 0)
-	container.content = content
-	return container
-}
-
-func (p *Markdown) isPrefixHeading(data []byte) bool {
+func (p *parser) isPrefixHeader(data []byte) bool {
 	if data[0] != '#' {
 		return false
 	}
 
-	if p.extensions&SpaceHeadings != 0 {
+	if p.flags&EXTENSION_SPACE_HEADERS != 0 {
 		level := 0
-		for level < 6 && level < len(data) && data[level] == '#' {
+		for level < 6 && data[level] == '#' {
 			level++
 		}
-		if level == len(data) || data[level] != ' ' {
+		if data[level] != ' ' {
 			return false
 		}
 	}
 	return true
 }
 
-func (p *Markdown) prefixHeading(data []byte) int {
+func (p *parser) prefixHeader(out *bytes.Buffer, data []byte) int {
 	level := 0
-	for level < 6 && level < len(data) && data[level] == '#' {
+	for level < 6 && data[level] == '#' {
 		level++
 	}
 	i := skipChar(data, level, ' ')
 	end := skipUntilChar(data, i, '\n')
 	skip := end
 	id := ""
-	if p.extensions&HeadingIDs != 0 {
+	if p.flags&EXTENSION_HEADER_IDS != 0 {
 		j, k := 0, 0
-		// find start/end of heading id
+		// find start/end of header id
 		for j = i; j < end-1 && (data[j] != '{' || data[j+1] != '#'); j++ {
 		}
 		for k = j + 1; k < end && data[k] != '}'; k++ {
 		}
-		// extract heading id iff found
+		// extract header id iff found
 		if j < end && k < end {
 			id = string(data[j+2 : k])
 			end = j
@@ -257,41 +242,45 @@ func (p *Markdown) prefixHeading(data []byte) int {
 		end--
 	}
 	if end > i {
-		if id == "" && p.extensions&AutoHeadingIDs != 0 {
-			id = sanitized_anchor_name.Create(string(data[i:end]))
+		if id == "" && p.flags&EXTENSION_AUTO_HEADER_IDS != 0 {
+			id = SanitizedAnchorName(string(data[i:end]))
 		}
-		block := p.addBlock(Heading, data[i:end])
-		block.HeadingID = id
-		block.Level = level
+		work := func() bool {
+			p.inline(out, data[i:end])
+			return true
+		}
+		p.r.Header(out, work, level, id)
 	}
 	return skip
 }
 
-func (p *Markdown) isUnderlinedHeading(data []byte) int {
-	// test of level 1 heading
+func (p *parser) isUnderlinedHeader(data []byte) int {
+	// test of level 1 header
 	if data[0] == '=' {
 		i := skipChar(data, 1, '=')
 		i = skipChar(data, i, ' ')
-		if i < len(data) && data[i] == '\n' {
+		if data[i] == '\n' {
 			return 1
+		} else {
+			return 0
 		}
-		return 0
 	}
 
-	// test of level 2 heading
+	// test of level 2 header
 	if data[0] == '-' {
 		i := skipChar(data, 1, '-')
 		i = skipChar(data, i, ' ')
-		if i < len(data) && data[i] == '\n' {
+		if data[i] == '\n' {
 			return 2
+		} else {
+			return 0
 		}
-		return 0
 	}
 
 	return 0
 }
 
-func (p *Markdown) titleBlock(data []byte, doRender bool) int {
+func (p *parser) titleBlock(out *bytes.Buffer, data []byte, doRender bool) int {
 	if data[0] != '%' {
 		return 0
 	}
@@ -305,17 +294,12 @@ func (p *Markdown) titleBlock(data []byte, doRender bool) int {
 	}
 
 	data = bytes.Join(splitData[0:i], []byte("\n"))
-	consumed := len(data)
-	data = bytes.TrimPrefix(data, []byte("% "))
-	data = bytes.Replace(data, []byte("\n% "), []byte("\n"), -1)
-	block := p.addBlock(Heading, data)
-	block.Level = 1
-	block.IsTitleblock = true
-
-	return consumed
+	p.r.TitleBlock(out, data)
+
+	return len(data)
 }
 
-func (p *Markdown) html(data []byte, doRender bool) int {
+func (p *parser) html(out *bytes.Buffer, data []byte, doRender bool) int {
 	var i, j int
 
 	// identify the opening tag
@@ -327,12 +311,17 @@ func (p *Markdown) html(data []byte, doRender bool) int {
 	// handle special cases
 	if !tagfound {
 		// check for an HTML comment
-		if size := p.htmlComment(data, doRender); size > 0 {
+		if size := p.htmlComment(out, data, doRender); size > 0 {
 			return size
 		}
 
 		// check for an <hr> tag
-		if size := p.htmlHr(data, doRender); size > 0 {
+		if size := p.htmlHr(out, data, doRender); size > 0 {
+			return size
+		}
+
+		// check for HTML CDATA
+		if size := p.htmlCDATA(out, data, doRender); size > 0 {
 			return size
 		}
 
@@ -407,42 +396,60 @@ func (p *Markdown) html(data []byte, doRender bool) int {
 		for end > 0 && data[end-1] == '\n' {
 			end--
 		}
-		finalizeHTMLBlock(p.addBlock(HTMLBlock, data[:end]))
+		p.r.BlockHtml(out, data[:end])
 	}
 
 	return i
 }
 
-func finalizeHTMLBlock(block *Node) {
-	block.Literal = block.content
-	block.content = nil
-}
-
-// HTML comment, lax form
-func (p *Markdown) htmlComment(data []byte, doRender bool) int {
-	i := p.inlineHTMLComment(data)
-	// needs to end with a blank line
-	if j := p.isEmpty(data[i:]); j > 0 {
-		size := i + j
+func (p *parser) renderHTMLBlock(out *bytes.Buffer, data []byte, start int, doRender bool) int {
+	// html block needs to end with a blank line
+	if i := p.isEmpty(data[start:]); i > 0 {
+		size := start + i
 		if doRender {
 			// trim trailing newlines
 			end := size
 			for end > 0 && data[end-1] == '\n' {
 				end--
 			}
-			block := p.addBlock(HTMLBlock, data[:end])
-			finalizeHTMLBlock(block)
+			p.r.BlockHtml(out, data[:end])
 		}
 		return size
 	}
 	return 0
 }
 
-// HR, which is the only self-closing block tag considered
-func (p *Markdown) htmlHr(data []byte, doRender bool) int {
-	if len(data) < 4 {
+// HTML comment, lax form
+func (p *parser) htmlComment(out *bytes.Buffer, data []byte, doRender bool) int {
+	i := p.inlineHTMLComment(out, data)
+	return p.renderHTMLBlock(out, data, i, doRender)
+}
+
+// HTML CDATA section
+func (p *parser) htmlCDATA(out *bytes.Buffer, data []byte, doRender bool) int {
+	const cdataTag = "<![cdata["
+	const cdataTagLen = len(cdataTag)
+	if len(data) < cdataTagLen+1 {
 		return 0
 	}
+	if !bytes.Equal(bytes.ToLower(data[:cdataTagLen]), []byte(cdataTag)) {
+		return 0
+	}
+	i := cdataTagLen
+	// scan for an end-of-comment marker, across lines if necessary
+	for i < len(data) && !(data[i-2] == ']' && data[i-1] == ']' && data[i] == '>') {
+		i++
+	}
+	i++
+	// no end-of-comment marker
+	if i >= len(data) {
+		return 0
+	}
+	return p.renderHTMLBlock(out, data, i, doRender)
+}
+
+// HR, which is the only self-closing block tag considered
+func (p *parser) htmlHr(out *bytes.Buffer, data []byte, doRender bool) int {
 	if data[0] != '<' || (data[1] != 'h' && data[1] != 'H') || (data[2] != 'r' && data[2] != 'R') {
 		return 0
 	}
@@ -450,31 +457,22 @@ func (p *Markdown) htmlHr(data []byte, doRender bool) int {
 		// not an <hr> tag after all; at least not a valid one
 		return 0
 	}
+
 	i := 3
-	for i < len(data) && data[i] != '>' && data[i] != '\n' {
+	for data[i] != '>' && data[i] != '\n' {
 		i++
 	}
-	if i < len(data) && data[i] == '>' {
-		i++
-		if j := p.isEmpty(data[i:]); j > 0 {
-			size := i + j
-			if doRender {
-				// trim newlines
-				end := size
-				for end > 0 && data[end-1] == '\n' {
-					end--
-				}
-				finalizeHTMLBlock(p.addBlock(HTMLBlock, data[:end]))
-			}
-			return size
-		}
+
+	if data[i] == '>' {
+		return p.renderHTMLBlock(out, data, i+1, doRender)
 	}
+
 	return 0
 }
 
-func (p *Markdown) htmlFindTag(data []byte) (string, bool) {
+func (p *parser) htmlFindTag(data []byte) (string, bool) {
 	i := 0
-	for i < len(data) && isalnum(data[i]) {
+	for isalnum(data[i]) {
 		i++
 	}
 	key := string(data[:i])
@@ -484,11 +482,9 @@ func (p *Markdown) htmlFindTag(data []byte) (string, bool) {
 	return "", false
 }
 
-func (p *Markdown) htmlFindEnd(tag string, data []byte) int {
+func (p *parser) htmlFindEnd(tag string, data []byte) int {
 	// assume data[0] == '<' && data[1] == '/' already tested
-	if tag == "hr" {
-		return 2
-	}
+
 	// check if tag is a match
 	closetag := []byte("</" + tag + ">")
 	if !bytes.HasPrefix(data, closetag) {
@@ -508,7 +504,7 @@ func (p *Markdown) htmlFindEnd(tag string, data []byte) int {
 		return i
 	}
 
-	if p.extensions&LaxHTMLBlocks != 0 {
+	if p.flags&EXTENSION_LAX_HTML_BLOCKS != 0 {
 		return i
 	}
 	if skip = p.isEmpty(data[i:]); skip == 0 {
@@ -519,7 +515,7 @@ func (p *Markdown) htmlFindEnd(tag string, data []byte) int {
 	return i + skip
 }
 
-func (*Markdown) isEmpty(data []byte) int {
+func (*parser) isEmpty(data []byte) int {
 	// it is okay to call isEmpty on an empty buffer
 	if len(data) == 0 {
 		return 0
@@ -531,13 +527,10 @@ func (*Markdown) isEmpty(data []byte) int {
 			return 0
 		}
 	}
-	if i < len(data) && data[i] == '\n' {
-		i++
-	}
-	return i
+	return i + 1
 }
 
-func (*Markdown) isHRule(data []byte) bool {
+func (*parser) isHRule(data []byte) bool {
 	i := 0
 
 	// skip up to three spaces
@@ -553,7 +546,7 @@ func (*Markdown) isHRule(data []byte) bool {
 
 	// the whole line must be the char or whitespace
 	n := 0
-	for i < len(data) && data[i] != '\n' {
+	for data[i] != '\n' {
 		switch {
 		case data[i] == c:
 			n++
@@ -569,7 +562,8 @@ func (*Markdown) isHRule(data []byte) bool {
 // isFenceLine checks if there's a fence line (e.g., ``` or ``` go) at the beginning of data,
 // and returns the end index if so, or 0 otherwise. It also returns the marker found.
 // If syntax is not nil, it gets set to the syntax specified in the fence line.
-func isFenceLine(data []byte, syntax *string, oldmarker string) (end int, marker string) {
+// A final newline is mandatory to recognize the fence line, unless newlineOptional is true.
+func isFenceLine(data []byte, info *string, oldmarker string, newlineOptional bool) (end int, marker string) {
 	i, size := 0, 0
 
 	// skip up to three spaces
@@ -605,26 +599,26 @@ func isFenceLine(data []byte, syntax *string, oldmarker string) (end int, marker
 	}
 
 	// TODO(shurcooL): It's probably a good idea to simplify the 2 code paths here
-	// into one, always get the syntax, and discard it if the caller doesn't care.
-	if syntax != nil {
-		syn := 0
+	// into one, always get the info string, and discard it if the caller doesn't care.
+	if info != nil {
+		infoLength := 0
 		i = skipChar(data, i, ' ')
 
 		if i >= len(data) {
-			if i == len(data) {
+			if newlineOptional && i == len(data) {
 				return i, marker
 			}
 			return 0, ""
 		}
 
-		syntaxStart := i
+		infoStart := i
 
 		if data[i] == '{' {
 			i++
-			syntaxStart++
+			infoStart++
 
 			for i < len(data) && data[i] != '}' && data[i] != '\n' {
-				syn++
+				infoLength++
 				i++
 			}
 
@@ -634,55 +628,55 @@ func isFenceLine(data []byte, syntax *string, oldmarker string) (end int, marker
 
 			// strip all whitespace at the beginning and the end
 			// of the {} block
-			for syn > 0 && isspace(data[syntaxStart]) {
-				syntaxStart++
-				syn--
+			for infoLength > 0 && isspace(data[infoStart]) {
+				infoStart++
+				infoLength--
 			}
 
-			for syn > 0 && isspace(data[syntaxStart+syn-1]) {
-				syn--
+			for infoLength > 0 && isspace(data[infoStart+infoLength-1]) {
+				infoLength--
 			}
 
 			i++
 		} else {
-			for i < len(data) && !isspace(data[i]) {
-				syn++
+			for i < len(data) && !isverticalspace(data[i]) {
+				infoLength++
 				i++
 			}
 		}
 
-		*syntax = string(data[syntaxStart : syntaxStart+syn])
+		*info = strings.TrimSpace(string(data[infoStart : infoStart+infoLength]))
 	}
 
 	i = skipChar(data, i, ' ')
 	if i >= len(data) || data[i] != '\n' {
-		if i == len(data) {
+		if newlineOptional && i == len(data) {
 			return i, marker
 		}
 		return 0, ""
 	}
+
 	return i + 1, marker // Take newline into account.
 }
 
 // fencedCodeBlock returns the end index if data contains a fenced code block at the beginning,
 // or 0 otherwise. It writes to out if doRender is true, otherwise it has no side effects.
 // If doRender is true, a final newline is mandatory to recognize the fenced code block.
-func (p *Markdown) fencedCodeBlock(data []byte, doRender bool) int {
-	var syntax string
-	beg, marker := isFenceLine(data, &syntax, "")
+func (p *parser) fencedCodeBlock(out *bytes.Buffer, data []byte, doRender bool) int {
+	var infoString string
+	beg, marker := isFenceLine(data, &infoString, "", false)
 	if beg == 0 || beg >= len(data) {
 		return 0
 	}
 
 	var work bytes.Buffer
-	work.Write([]byte(syntax))
-	work.WriteByte('\n')
 
 	for {
 		// safe to assume beg < len(data)
 
 		// check for the end of the code block
-		fenceEnd, _ := isFenceLine(data[beg:], nil, marker)
+		newlineOptional := !doRender
+		fenceEnd, _ := isFenceLine(data[beg:], nil, marker, newlineOptional)
 		if fenceEnd != 0 {
 			beg += fenceEnd
 			break
@@ -704,55 +698,24 @@ func (p *Markdown) fencedCodeBlock(data []byte, doRender bool) int {
 	}
 
 	if doRender {
-		block := p.addBlock(CodeBlock, work.Bytes()) // TODO: get rid of temp buffer
-		block.IsFenced = true
-		finalizeCodeBlock(block)
+		p.r.BlockCode(out, work.Bytes(), infoString)
 	}
 
 	return beg
 }
 
-func unescapeChar(str []byte) []byte {
-	if str[0] == '\\' {
-		return []byte{str[1]}
-	}
-	return []byte(html.UnescapeString(string(str)))
-}
-
-func unescapeString(str []byte) []byte {
-	if reBackslashOrAmp.Match(str) {
-		return reEntityOrEscapedChar.ReplaceAllFunc(str, unescapeChar)
-	}
-	return str
-}
-
-func finalizeCodeBlock(block *Node) {
-	if block.IsFenced {
-		newlinePos := bytes.IndexByte(block.content, '\n')
-		firstLine := block.content[:newlinePos]
-		rest := block.content[newlinePos+1:]
-		block.Info = unescapeString(bytes.Trim(firstLine, "\n"))
-		block.Literal = rest
-	} else {
-		block.Literal = block.content
-	}
-	block.content = nil
-}
-
-func (p *Markdown) table(data []byte) int {
-	table := p.addBlock(Table, nil)
-	i, columns := p.tableHeader(data)
+func (p *parser) table(out *bytes.Buffer, data []byte) int {
+	var header bytes.Buffer
+	i, columns := p.tableHeader(&header, data)
 	if i == 0 {
-		p.tip = table.Parent
-		table.Unlink()
 		return 0
 	}
 
-	p.addBlock(TableBody, nil)
+	var body bytes.Buffer
 
 	for i < len(data) {
 		pipes, rowStart := 0, i
-		for ; i < len(data) && data[i] != '\n'; i++ {
+		for ; data[i] != '\n'; i++ {
 			if data[i] == '|' {
 				pipes++
 			}
@@ -764,12 +727,12 @@ func (p *Markdown) table(data []byte) int {
 		}
 
 		// include the newline in data sent to tableRow
-		if i < len(data) && data[i] == '\n' {
-			i++
-		}
-		p.tableRow(data[rowStart:i], columns, false)
+		i++
+		p.tableRow(&body, data[rowStart:i], columns, false)
 	}
 
+	p.r.Table(out, header.Bytes(), body.Bytes(), columns)
+
 	return i
 }
 
@@ -782,10 +745,10 @@ func isBackslashEscaped(data []byte, i int) bool {
 	return backslashes&1 == 1
 }
 
-func (p *Markdown) tableHeader(data []byte) (size int, columns []CellAlignFlags) {
+func (p *parser) tableHeader(out *bytes.Buffer, data []byte) (size int, columns []int) {
 	i := 0
 	colCount := 1
-	for i = 0; i < len(data) && data[i] != '\n'; i++ {
+	for i = 0; data[i] != '\n'; i++ {
 		if data[i] == '|' && !isBackslashEscaped(data, i) {
 			colCount++
 		}
@@ -797,11 +760,7 @@ func (p *Markdown) tableHeader(data []byte) (size int, columns []CellAlignFlags)
 	}
 
 	// include the newline in the data sent to tableRow
-	j := i
-	if j < len(data) && data[j] == '\n' {
-		j++
-	}
-	header := data[:j]
+	header := data[:i+1]
 
 	// column count ignores pipes at beginning or end of line
 	if data[0] == '|' {
@@ -811,7 +770,7 @@ func (p *Markdown) tableHeader(data []byte) (size int, columns []CellAlignFlags)
 		colCount--
 	}
 
-	columns = make([]CellAlignFlags, colCount)
+	columns = make([]int, colCount)
 
 	// move on to the header underline
 	i++
@@ -827,29 +786,27 @@ func (p *Markdown) tableHeader(data []byte) (size int, columns []CellAlignFlags)
 	// each column header is of form: / *:?-+:? *|/ with # dashes + # colons >= 3
 	// and trailing | optional on last column
 	col := 0
-	for i < len(data) && data[i] != '\n' {
+	for data[i] != '\n' {
 		dashes := 0
 
 		if data[i] == ':' {
 			i++
-			columns[col] |= TableAlignmentLeft
+			columns[col] |= TABLE_ALIGNMENT_LEFT
 			dashes++
 		}
-		for i < len(data) && data[i] == '-' {
+		for data[i] == '-' {
 			i++
 			dashes++
 		}
-		if i < len(data) && data[i] == ':' {
+		if data[i] == ':' {
 			i++
-			columns[col] |= TableAlignmentRight
+			columns[col] |= TABLE_ALIGNMENT_RIGHT
 			dashes++
 		}
-		for i < len(data) && data[i] == ' ' {
+		for data[i] == ' ' {
 			i++
 		}
-		if i == len(data) {
-			return
-		}
+
 		// end of column test is messy
 		switch {
 		case dashes < 3:
@@ -860,12 +817,12 @@ func (p *Markdown) tableHeader(data []byte) (size int, columns []CellAlignFlags)
 			// marker found, now skip past trailing whitespace
 			col++
 			i++
-			for i < len(data) && data[i] == ' ' {
+			for data[i] == ' ' {
 				i++
 			}
 
 			// trailing junk found after last column
-			if col >= colCount && i < len(data) && data[i] != '\n' {
+			if col >= colCount && data[i] != '\n' {
 				return
 			}
 
@@ -886,31 +843,27 @@ func (p *Markdown) tableHeader(data []byte) (size int, columns []CellAlignFlags)
 		return
 	}
 
-	p.addBlock(TableHead, nil)
-	p.tableRow(header, columns, true)
-	size = i
-	if size < len(data) && data[size] == '\n' {
-		size++
-	}
+	p.tableRow(out, header, columns, true)
+	size = i + 1
 	return
 }
 
-func (p *Markdown) tableRow(data []byte, columns []CellAlignFlags, header bool) {
-	p.addBlock(TableRow, nil)
+func (p *parser) tableRow(out *bytes.Buffer, data []byte, columns []int, header bool) {
 	i, col := 0, 0
+	var rowWork bytes.Buffer
 
 	if data[i] == '|' && !isBackslashEscaped(data, i) {
 		i++
 	}
 
 	for col = 0; col < len(columns) && i < len(data); col++ {
-		for i < len(data) && data[i] == ' ' {
+		for data[i] == ' ' {
 			i++
 		}
 
 		cellStart := i
 
-		for i < len(data) && (data[i] != '|' || isBackslashEscaped(data, i)) && data[i] != '\n' {
+		for (data[i] != '|' || isBackslashEscaped(data, i)) && data[i] != '\n' {
 			i++
 		}
 
@@ -919,33 +872,42 @@ func (p *Markdown) tableRow(data []byte, columns []CellAlignFlags, header bool)
 		// skip the end-of-cell marker, possibly taking us past end of buffer
 		i++
 
-		for cellEnd > cellStart && cellEnd-1 < len(data) && data[cellEnd-1] == ' ' {
+		for cellEnd > cellStart && data[cellEnd-1] == ' ' {
 			cellEnd--
 		}
 
-		cell := p.addBlock(TableCell, data[cellStart:cellEnd])
-		cell.IsHeader = header
-		cell.Align = columns[col]
+		var cellWork bytes.Buffer
+		p.inline(&cellWork, data[cellStart:cellEnd])
+
+		if header {
+			p.r.TableHeaderCell(&rowWork, cellWork.Bytes(), columns[col])
+		} else {
+			p.r.TableCell(&rowWork, cellWork.Bytes(), columns[col])
+		}
 	}
 
 	// pad it out with empty columns to get the right number
 	for ; col < len(columns); col++ {
-		cell := p.addBlock(TableCell, nil)
-		cell.IsHeader = header
-		cell.Align = columns[col]
+		if header {
+			p.r.TableHeaderCell(&rowWork, nil, columns[col])
+		} else {
+			p.r.TableCell(&rowWork, nil, columns[col])
+		}
 	}
 
 	// silently ignore rows with too many cells
+
+	p.r.TableRow(out, rowWork.Bytes())
 }
 
 // returns blockquote prefix length
-func (p *Markdown) quotePrefix(data []byte) int {
+func (p *parser) quotePrefix(data []byte) int {
 	i := 0
-	for i < 3 && i < len(data) && data[i] == ' ' {
+	for i < 3 && data[i] == ' ' {
 		i++
 	}
-	if i < len(data) && data[i] == '>' {
-		if i+1 < len(data) && data[i+1] == ' ' {
+	if data[i] == '>' {
+		if data[i+1] == ' ' {
 			return i + 2
 		}
 		return i + 1
@@ -955,7 +917,7 @@ func (p *Markdown) quotePrefix(data []byte) int {
 
 // blockquote ends with at least one blank line
 // followed by something without a blockquote prefix
-func (p *Markdown) terminateBlockquote(data []byte, beg, end int) bool {
+func (p *parser) terminateBlockquote(data []byte, beg, end int) bool {
 	if p.isEmpty(data[beg:]) <= 0 {
 		return false
 	}
@@ -966,8 +928,7 @@ func (p *Markdown) terminateBlockquote(data []byte, beg, end int) bool {
 }
 
 // parse a blockquote fragment
-func (p *Markdown) quote(data []byte) int {
-	block := p.addBlock(BlockQuote, nil)
+func (p *parser) quote(out *bytes.Buffer, data []byte) int {
 	var raw bytes.Buffer
 	beg, end := 0, 0
 	for beg < len(data) {
@@ -975,9 +936,9 @@ func (p *Markdown) quote(data []byte) int {
 		// Step over whole lines, collecting them. While doing that, check for
 		// fenced code and if one's found, incorporate it altogether,
 		// irregardless of any contents inside it
-		for end < len(data) && data[end] != '\n' {
-			if p.extensions&FencedCode != 0 {
-				if i := p.fencedCodeBlock(data[end:], false); i > 0 {
+		for data[end] != '\n' {
+			if p.flags&EXTENSION_FENCED_CODE != 0 {
+				if i := p.fencedCodeBlock(out, data[end:], false); i > 0 {
 					// -1 to compensate for the extra end++ after the loop:
 					end += i - 1
 					break
@@ -985,47 +946,44 @@ func (p *Markdown) quote(data []byte) int {
 			}
 			end++
 		}
-		if end < len(data) && data[end] == '\n' {
-			end++
-		}
+		end++
+
 		if pre := p.quotePrefix(data[beg:]); pre > 0 {
 			// skip the prefix
 			beg += pre
 		} else if p.terminateBlockquote(data, beg, end) {
 			break
 		}
+
 		// this line is part of the blockquote
 		raw.Write(data[beg:end])
 		beg = end
 	}
-	p.block(raw.Bytes())
-	p.finalize(block)
+
+	var cooked bytes.Buffer
+	p.block(&cooked, raw.Bytes())
+	p.r.BlockQuote(out, cooked.Bytes())
 	return end
 }
 
 // returns prefix length for block code
-func (p *Markdown) codePrefix(data []byte) int {
-	if len(data) >= 1 && data[0] == '\t' {
-		return 1
-	}
-	if len(data) >= 4 && data[0] == ' ' && data[1] == ' ' && data[2] == ' ' && data[3] == ' ' {
+func (p *parser) codePrefix(data []byte) int {
+	if data[0] == ' ' && data[1] == ' ' && data[2] == ' ' && data[3] == ' ' {
 		return 4
 	}
 	return 0
 }
 
-func (p *Markdown) code(data []byte) int {
+func (p *parser) code(out *bytes.Buffer, data []byte) int {
 	var work bytes.Buffer
 
 	i := 0
 	for i < len(data) {
 		beg := i
-		for i < len(data) && data[i] != '\n' {
-			i++
-		}
-		if i < len(data) && data[i] == '\n' {
+		for data[i] != '\n' {
 			i++
 		}
+		i++
 
 		blankline := p.isEmpty(data[beg:i]) > 0
 		if pre := p.codePrefix(data[beg:i]); pre > 0 {
@@ -1036,7 +994,7 @@ func (p *Markdown) code(data []byte) int {
 			break
 		}
 
-		// verbatim copy to the working buffer
+		// verbatim copy to the working buffeu
 		if blankline {
 			work.WriteByte('\n')
 		} else {
@@ -1056,183 +1014,122 @@ func (p *Markdown) code(data []byte) int {
 
 	work.WriteByte('\n')
 
-	block := p.addBlock(CodeBlock, work.Bytes()) // TODO: get rid of temp buffer
-	block.IsFenced = false
-	finalizeCodeBlock(block)
+	p.r.BlockCode(out, work.Bytes(), "")
 
 	return i
 }
 
 // returns unordered list item prefix
-func (p *Markdown) uliPrefix(data []byte) int {
+func (p *parser) uliPrefix(data []byte) int {
 	i := 0
+
 	// start with up to 3 spaces
-	for i < len(data) && i < 3 && data[i] == ' ' {
+	for i < 3 && data[i] == ' ' {
 		i++
 	}
-	if i >= len(data)-1 {
-		return 0
-	}
-	// need one of {'*', '+', '-'} followed by a space or a tab
+
+	// need a *, +, or - followed by a space
 	if (data[i] != '*' && data[i] != '+' && data[i] != '-') ||
-		(data[i+1] != ' ' && data[i+1] != '\t') {
+		data[i+1] != ' ' {
 		return 0
 	}
 	return i + 2
 }
 
 // returns ordered list item prefix
-func (p *Markdown) oliPrefix(data []byte) int {
+func (p *parser) oliPrefix(data []byte) int {
 	i := 0
 
 	// start with up to 3 spaces
-	for i < 3 && i < len(data) && data[i] == ' ' {
+	for i < 3 && data[i] == ' ' {
 		i++
 	}
 
 	// count the digits
 	start := i
-	for i < len(data) && data[i] >= '0' && data[i] <= '9' {
+	for data[i] >= '0' && data[i] <= '9' {
 		i++
 	}
-	if start == i || i >= len(data)-1 {
-		return 0
-	}
 
-	// we need >= 1 digits followed by a dot and a space or a tab
-	if data[i] != '.' || !(data[i+1] == ' ' || data[i+1] == '\t') {
+	// we need >= 1 digits followed by a dot and a space
+	if start == i || data[i] != '.' || data[i+1] != ' ' {
 		return 0
 	}
 	return i + 2
 }
 
 // returns definition list item prefix
-func (p *Markdown) dliPrefix(data []byte) int {
-	if len(data) < 2 {
-		return 0
-	}
+func (p *parser) dliPrefix(data []byte) int {
 	i := 0
-	// need a ':' followed by a space or a tab
-	if data[i] != ':' || !(data[i+1] == ' ' || data[i+1] == '\t') {
+
+	// need a : followed by a spaces
+	if data[i] != ':' || data[i+1] != ' ' {
 		return 0
 	}
-	for i < len(data) && data[i] == ' ' {
+	for data[i] == ' ' {
 		i++
 	}
 	return i + 2
 }
 
 // parse ordered or unordered list block
-func (p *Markdown) list(data []byte, flags ListType) int {
+func (p *parser) list(out *bytes.Buffer, data []byte, flags int) int {
 	i := 0
-	flags |= ListItemBeginningOfList
-	block := p.addBlock(List, nil)
-	block.ListFlags = flags
-	block.Tight = true
-
-	for i < len(data) {
-		skip := p.listItem(data[i:], &flags)
-		if flags&ListItemContainsBlock != 0 {
-			block.ListData.Tight = false
-		}
-		i += skip
-		if skip == 0 || flags&ListItemEndOfList != 0 {
-			break
-		}
-		flags &= ^ListItemBeginningOfList
-	}
-
-	above := block.Parent
-	finalizeList(block)
-	p.tip = above
-	return i
-}
-
-// Returns true if block ends with a blank line, descending if needed
-// into lists and sublists.
-func endsWithBlankLine(block *Node) bool {
-	// TODO: figure this out. Always false now.
-	for block != nil {
-		//if block.lastLineBlank {
-		//return true
-		//}
-		t := block.Type
-		if t == List || t == Item {
-			block = block.LastChild
-		} else {
-			break
-		}
-	}
-	return false
-}
+	flags |= LIST_ITEM_BEGINNING_OF_LIST
+	work := func() bool {
+		for i < len(data) {
+			skip := p.listItem(out, data[i:], &flags)
+			i += skip
 
-func finalizeList(block *Node) {
-	block.open = false
-	item := block.FirstChild
-	for item != nil {
-		// check for non-final list item ending with blank line:
-		if endsWithBlankLine(item) && item.Next != nil {
-			block.ListData.Tight = false
-			break
-		}
-		// recurse into children of list item, to see if there are spaces
-		// between any of them:
-		subItem := item.FirstChild
-		for subItem != nil {
-			if endsWithBlankLine(subItem) && (item.Next != nil || subItem.Next != nil) {
-				block.ListData.Tight = false
+			if skip == 0 || flags&LIST_ITEM_END_OF_LIST != 0 {
 				break
 			}
-			subItem = subItem.Next
+			flags &= ^LIST_ITEM_BEGINNING_OF_LIST
 		}
-		item = item.Next
+		return true
 	}
+
+	p.r.List(out, work, flags)
+	return i
 }
 
 // Parse a single list item.
 // Assumes initial prefix is already removed if this is a sublist.
-func (p *Markdown) listItem(data []byte, flags *ListType) int {
+func (p *parser) listItem(out *bytes.Buffer, data []byte, flags *int) int {
 	// keep track of the indentation of the first line
 	itemIndent := 0
-	if data[0] == '\t' {
-		itemIndent += 4
-	} else {
-		for itemIndent < 3 && data[itemIndent] == ' ' {
-			itemIndent++
-		}
+	for itemIndent < 3 && data[itemIndent] == ' ' {
+		itemIndent++
 	}
 
-	var bulletChar byte = '*'
 	i := p.uliPrefix(data)
 	if i == 0 {
 		i = p.oliPrefix(data)
-	} else {
-		bulletChar = data[i-2]
 	}
 	if i == 0 {
 		i = p.dliPrefix(data)
 		// reset definition term flag
 		if i > 0 {
-			*flags &= ^ListTypeTerm
+			*flags &= ^LIST_TYPE_TERM
 		}
 	}
 	if i == 0 {
-		// if in definition list, set term flag and continue
-		if *flags&ListTypeDefinition != 0 {
-			*flags |= ListTypeTerm
+		// if in defnition list, set term flag and continue
+		if *flags&LIST_TYPE_DEFINITION != 0 {
+			*flags |= LIST_TYPE_TERM
 		} else {
 			return 0
 		}
 	}
 
 	// skip leading whitespace on first line
-	for i < len(data) && data[i] == ' ' {
+	for data[i] == ' ' {
 		i++
 	}
 
 	// find the end of the line
 	line := i
-	for i > 0 && i < len(data) && data[i-1] != '\n' {
+	for i > 0 && data[i-1] != '\n' {
 		i++
 	}
 
@@ -1246,13 +1143,14 @@ func (p *Markdown) listItem(data []byte, flags *ListType) int {
 	// process the following lines
 	containsBlankLine := false
 	sublist := 0
+	codeBlockMarker := ""
 
 gatherlines:
 	for line < len(data) {
 		i++
 
 		// find the end of this line
-		for i < len(data) && data[i-1] != '\n' {
+		for data[i-1] != '\n' {
 			i++
 		}
 
@@ -1260,24 +1158,40 @@ gatherlines:
 		// and move on to the next line
 		if p.isEmpty(data[line:i]) > 0 {
 			containsBlankLine = true
+			raw.Write(data[line:i])
 			line = i
 			continue
 		}
 
 		// calculate the indentation
 		indent := 0
-		indentIndex := 0
-		if data[line] == '\t' {
-			indentIndex++
-			indent += 4
-		} else {
-			for indent < 4 && line+indent < i && data[line+indent] == ' ' {
-				indent++
-				indentIndex++
-			}
+		for indent < 4 && line+indent < i && data[line+indent] == ' ' {
+			indent++
 		}
 
-		chunk := data[line+indentIndex : i]
+		chunk := data[line+indent : i]
+
+		if p.flags&EXTENSION_FENCED_CODE != 0 {
+			// determine if in or out of codeblock
+			// if in codeblock, ignore normal list processing
+			_, marker := isFenceLine(chunk, nil, codeBlockMarker, false)
+			if marker != "" {
+				if codeBlockMarker == "" {
+					// start of codeblock
+					codeBlockMarker = marker
+				} else {
+					// end of codeblock.
+					*flags |= LIST_ITEM_CONTAINS_BLOCK
+					codeBlockMarker = ""
+				}
+			}
+			// we are in a codeblock, write line, and continue
+			if codeBlockMarker != "" || marker != "" {
+				raw.Write(data[line+indent : i])
+				line = i
+				continue gatherlines
+			}
+		}
 
 		// evaluate how this line fits in
 		switch {
@@ -1287,7 +1201,15 @@ gatherlines:
 			p.dliPrefix(chunk) > 0:
 
 			if containsBlankLine {
-				*flags |= ListItemContainsBlock
+				// end the list if the type changed after a blank line
+				if indent <= itemIndent &&
+					((*flags&LIST_TYPE_ORDERED != 0 && p.uliPrefix(chunk) > 0) ||
+						(*flags&LIST_TYPE_ORDERED == 0 && p.oliPrefix(chunk) > 0)) {
+
+					*flags |= LIST_ITEM_END_OF_LIST
+					break gatherlines
+				}
+				*flags |= LIST_ITEM_CONTAINS_BLOCK
 			}
 
 			// to be a nested list, it must be indented more
@@ -1301,89 +1223,93 @@ gatherlines:
 				sublist = raw.Len()
 			}
 
-		// is this a nested prefix heading?
-		case p.isPrefixHeading(chunk):
-			// if the heading is not indented, it is not nested in the list
+		// is this a nested prefix header?
+		case p.isPrefixHeader(chunk):
+			// if the header is not indented, it is not nested in the list
 			// and thus ends the list
 			if containsBlankLine && indent < 4 {
-				*flags |= ListItemEndOfList
+				*flags |= LIST_ITEM_END_OF_LIST
 				break gatherlines
 			}
-			*flags |= ListItemContainsBlock
+			*flags |= LIST_ITEM_CONTAINS_BLOCK
 
 		// anything following an empty line is only part
 		// of this item if it is indented 4 spaces
 		// (regardless of the indentation of the beginning of the item)
 		case containsBlankLine && indent < 4:
-			if *flags&ListTypeDefinition != 0 && i < len(data)-1 {
+			if *flags&LIST_TYPE_DEFINITION != 0 && i < len(data)-1 {
 				// is the next item still a part of this list?
 				next := i
-				for next < len(data) && data[next] != '\n' {
+				for data[next] != '\n' {
 					next++
 				}
 				for next < len(data)-1 && data[next] == '\n' {
 					next++
 				}
 				if i < len(data)-1 && data[i] != ':' && data[next] != ':' {
-					*flags |= ListItemEndOfList
+					*flags |= LIST_ITEM_END_OF_LIST
 				}
 			} else {
-				*flags |= ListItemEndOfList
+				*flags |= LIST_ITEM_END_OF_LIST
 			}
 			break gatherlines
 
 		// a blank line means this should be parsed as a block
 		case containsBlankLine:
-			raw.WriteByte('\n')
-			*flags |= ListItemContainsBlock
+			*flags |= LIST_ITEM_CONTAINS_BLOCK
 		}
 
-		// if this line was preceded by one or more blanks,
-		// re-introduce the blank into the buffer
-		if containsBlankLine {
-			containsBlankLine = false
-			raw.WriteByte('\n')
-		}
+		containsBlankLine = false
 
 		// add the line into the working buffer without prefix
-		raw.Write(data[line+indentIndex : i])
+		raw.Write(data[line+indent : i])
 
 		line = i
 	}
 
-	rawBytes := raw.Bytes()
+	// If reached end of data, the Renderer.ListItem call we're going to make below
+	// is definitely the last in the list.
+	if line >= len(data) {
+		*flags |= LIST_ITEM_END_OF_LIST
+	}
 
-	block := p.addBlock(Item, nil)
-	block.ListFlags = *flags
-	block.Tight = false
-	block.BulletChar = bulletChar
-	block.Delimiter = '.' // Only '.' is possible in Markdown, but ')' will also be possible in CommonMark
+	rawBytes := raw.Bytes()
 
 	// render the contents of the list item
-	if *flags&ListItemContainsBlock != 0 && *flags&ListTypeTerm == 0 {
+	var cooked bytes.Buffer
+	if *flags&LIST_ITEM_CONTAINS_BLOCK != 0 && *flags&LIST_TYPE_TERM == 0 {
 		// intermediate render of block item, except for definition term
 		if sublist > 0 {
-			p.block(rawBytes[:sublist])
-			p.block(rawBytes[sublist:])
+			p.block(&cooked, rawBytes[:sublist])
+			p.block(&cooked, rawBytes[sublist:])
 		} else {
-			p.block(rawBytes)
+			p.block(&cooked, rawBytes)
 		}
 	} else {
 		// intermediate render of inline item
 		if sublist > 0 {
-			child := p.addChild(Paragraph, 0)
-			child.content = rawBytes[:sublist]
-			p.block(rawBytes[sublist:])
+			p.inline(&cooked, rawBytes[:sublist])
+			p.block(&cooked, rawBytes[sublist:])
 		} else {
-			child := p.addChild(Paragraph, 0)
-			child.content = rawBytes
+			p.inline(&cooked, rawBytes)
 		}
 	}
+
+	// render the actual list item
+	cookedBytes := cooked.Bytes()
+	parsedEnd := len(cookedBytes)
+
+	// strip trailing newlines
+	for parsedEnd > 0 && cookedBytes[parsedEnd-1] == '\n' {
+		parsedEnd--
+	}
+	p.r.ListItem(out, cookedBytes[:parsedEnd], *flags)
+
 	return line
 }
 
 // render a single paragraph that has already been parsed out
-func (p *Markdown) renderParagraph(data []byte) {
+func (p *parser) renderParagraph(out *bytes.Buffer, data []byte) {
 	if len(data) == 0 {
 		return
 	}
@@ -1394,29 +1320,27 @@ func (p *Markdown) renderParagraph(data []byte) {
 		beg++
 	}
 
-	end := len(data)
 	// trim trailing newline
-	if data[len(data)-1] == '\n' {
-		end--
-	}
+	end := len(data) - 1
 
 	// trim trailing spaces
 	for end > beg && data[end-1] == ' ' {
 		end--
 	}
 
-	p.addBlock(Paragraph, data[beg:end])
+	work := func() bool {
+		p.inline(out, data[beg:end])
+		return true
+	}
+	p.r.Paragraph(out, work)
 }
 
-func (p *Markdown) paragraph(data []byte) int {
+func (p *parser) paragraph(out *bytes.Buffer, data []byte) int {
 	// prev: index of 1st char of previous line
 	// line: index of 1st char of current line
 	// i: index of cursor/end of current line
 	var prev, line, i int
-	tabSize := TabSizeDefault
-	if p.extensions&TabSizeEight != 0 {
-		tabSize = TabSizeDouble
-	}
+
 	// keep going until we find something to mark the end of the paragraph
 	for i < len(data) {
 		// mark the beginning of the current line
@@ -1424,32 +1348,24 @@ func (p *Markdown) paragraph(data []byte) int {
 		current := data[i:]
 		line = i
 
-		// did we find a reference or a footnote? If so, end a paragraph
-		// preceding it and report that we have consumed up to the end of that
-		// reference:
-		if refEnd := isReference(p, current, tabSize); refEnd > 0 {
-			p.renderParagraph(data[:i])
-			return i + refEnd
-		}
-
 		// did we find a blank line marking the end of the paragraph?
 		if n := p.isEmpty(current); n > 0 {
 			// did this blank line followed by a definition list item?
-			if p.extensions&DefinitionLists != 0 {
+			if p.flags&EXTENSION_DEFINITION_LISTS != 0 {
 				if i < len(data)-1 && data[i+1] == ':' {
-					return p.list(data[prev:], ListTypeDefinition)
+					return p.list(out, data[prev:], LIST_TYPE_DEFINITION)
 				}
 			}
 
-			p.renderParagraph(data[:i])
+			p.renderParagraph(out, data[:i])
 			return i + n
 		}
 
-		// an underline under some text marks a heading, so our paragraph ended on prev line
+		// an underline under some text marks a header, so our paragraph ended on prev line
 		if i > 0 {
-			if level := p.isUnderlinedHeading(current); level > 0 {
+			if level := p.isUnderlinedHeader(current); level > 0 {
 				// render the paragraph
-				p.renderParagraph(data[:prev])
+				p.renderParagraph(out, data[:prev])
 
 				// ignore leading and trailing whitespace
 				eol := i - 1
@@ -1460,17 +1376,24 @@ func (p *Markdown) paragraph(data []byte) int {
 					eol--
 				}
 
+				// render the header
+				// this ugly double closure avoids forcing variables onto the heap
+				work := func(o *bytes.Buffer, pp *parser, d []byte) func() bool {
+					return func() bool {
+						pp.inline(o, d)
+						return true
+					}
+				}(out, p, data[prev:eol])
+
 				id := ""
-				if p.extensions&AutoHeadingIDs != 0 {
-					id = sanitized_anchor_name.Create(string(data[prev:eol]))
+				if p.flags&EXTENSION_AUTO_HEADER_IDS != 0 {
+					id = SanitizedAnchorName(string(data[prev:eol]))
 				}
 
-				block := p.addBlock(Heading, data[prev:eol])
-				block.Level = level
-				block.HeadingID = id
+				p.r.Header(out, work, level, id)
 
 				// find the end of the underline
-				for i < len(data) && data[i] != '\n' {
+				for data[i] != '\n' {
 					i++
 				}
 				return i
@@ -1478,72 +1401,74 @@ func (p *Markdown) paragraph(data []byte) int {
 		}
 
 		// if the next line starts a block of HTML, then the paragraph ends here
-		if p.extensions&LaxHTMLBlocks != 0 {
-			if data[i] == '<' && p.html(current, false) > 0 {
+		if p.flags&EXTENSION_LAX_HTML_BLOCKS != 0 {
+			if data[i] == '<' && p.html(out, current, false) > 0 {
 				// rewind to before the HTML block
-				p.renderParagraph(data[:i])
+				p.renderParagraph(out, data[:i])
 				return i
 			}
 		}
 
-		// if there's a prefixed heading or a horizontal rule after this, paragraph is over
-		if p.isPrefixHeading(current) || p.isHRule(current) {
-			p.renderParagraph(data[:i])
+		// if there's a prefixed header or a horizontal rule after this, paragraph is over
+		if p.isPrefixHeader(current) || p.isHRule(current) {
+			p.renderParagraph(out, data[:i])
 			return i
 		}
 
 		// if there's a fenced code block, paragraph is over
-		if p.extensions&FencedCode != 0 {
-			if p.fencedCodeBlock(current, false) > 0 {
-				p.renderParagraph(data[:i])
+		if p.flags&EXTENSION_FENCED_CODE != 0 {
+			if p.fencedCodeBlock(out, current, false) > 0 {
+				p.renderParagraph(out, data[:i])
 				return i
 			}
 		}
 
 		// if there's a definition list item, prev line is a definition term
-		if p.extensions&DefinitionLists != 0 {
+		if p.flags&EXTENSION_DEFINITION_LISTS != 0 {
 			if p.dliPrefix(current) != 0 {
-				ret := p.list(data[prev:], ListTypeDefinition)
-				return ret
+				return p.list(out, data[prev:], LIST_TYPE_DEFINITION)
 			}
 		}
 
 		// if there's a list after this, paragraph is over
-		if p.extensions&NoEmptyLineBeforeBlock != 0 {
+		if p.flags&EXTENSION_NO_EMPTY_LINE_BEFORE_BLOCK != 0 {
 			if p.uliPrefix(current) != 0 ||
 				p.oliPrefix(current) != 0 ||
 				p.quotePrefix(current) != 0 ||
 				p.codePrefix(current) != 0 {
-				p.renderParagraph(data[:i])
+				p.renderParagraph(out, data[:i])
 				return i
 			}
 		}
 
 		// otherwise, scan to the beginning of the next line
-		nl := bytes.IndexByte(data[i:], '\n')
-		if nl >= 0 {
-			i += nl + 1
-		} else {
-			i += len(data[i:])
+		for data[i] != '\n' {
+			i++
 		}
-	}
-
-	p.renderParagraph(data[:i])
-	return i
-}
-
-func skipChar(data []byte, start int, char byte) int {
-	i := start
-	for i < len(data) && data[i] == char {
 		i++
 	}
+
+	p.renderParagraph(out, data[:i])
 	return i
 }
 
-func skipUntilChar(text []byte, start int, char byte) int {
-	i := start
-	for i < len(text) && text[i] != char {
-		i++
+// SanitizedAnchorName returns a sanitized anchor name for the given text.
+//
+// It implements the algorithm specified in the package comment.
+func SanitizedAnchorName(text string) string {
+	var anchorName []rune
+	futureDash := false
+	for _, r := range text {
+		switch {
+		case unicode.IsLetter(r) || unicode.IsNumber(r):
+			if futureDash && len(anchorName) > 0 {
+				anchorName = append(anchorName, '-')
+			}
+			futureDash = false
+			anchorName = append(anchorName, unicode.ToLower(r))
+		default:
+			futureDash = true
+		}
 	}
-	return i
+	return string(anchorName)
 }
diff --git a/vendor/github.com/russross/blackfriday/doc.go b/vendor/github.com/russross/blackfriday/doc.go
index 5b3fa987..9656c42a 100644
--- a/vendor/github.com/russross/blackfriday/doc.go
+++ b/vendor/github.com/russross/blackfriday/doc.go
@@ -1,18 +1,32 @@
-// Package blackfriday is a markdown processor.
+// Package blackfriday is a Markdown processor.
 //
-// It translates plain text with simple formatting rules into an AST, which can
-// then be further processed to HTML (provided by Blackfriday itself) or other
-// formats (provided by the community).
+// It translates plain text with simple formatting rules into HTML or LaTeX.
 //
-// The simplest way to invoke Blackfriday is to call the Run function. It will
-// take a text input and produce a text output in HTML (or other format).
+// Sanitized Anchor Names
 //
-// A slightly more sophisticated way to use Blackfriday is to create a Markdown
-// processor and to call Parse, which returns a syntax tree for the input
-// document. You can leverage Blackfriday's parsing for content extraction from
-// markdown documents. You can assign a custom renderer and set various options
-// to the Markdown processor.
+// Blackfriday includes an algorithm for creating sanitized anchor names
+// corresponding to a given input text. This algorithm is used to create
+// anchors for headings when EXTENSION_AUTO_HEADER_IDS is enabled. The
+// algorithm is specified below, so that other packages can create
+// compatible anchor names and links to those anchors.
 //
-// If you're interested in calling Blackfriday from command line, see
-// https://github.com/russross/blackfriday-tool.
+// The algorithm iterates over the input text, interpreted as UTF-8,
+// one Unicode code point (rune) at a time. All runes that are letters (category L)
+// or numbers (category N) are considered valid characters. They are mapped to
+// lower case, and included in the output. All other runes are considered
+// invalid characters. Invalid characters that preceed the first valid character,
+// as well as invalid character that follow the last valid character
+// are dropped completely. All other sequences of invalid characters
+// between two valid characters are replaced with a single dash character '-'.
+//
+// SanitizedAnchorName exposes this functionality, and can be used to
+// create compatible links to the anchor names generated by blackfriday.
+// This algorithm is also implemented in a small standalone package at
+// github.com/shurcooL/sanitized_anchor_name. It can be useful for clients
+// that want a small package and don't need full functionality of blackfriday.
 package blackfriday
+
+// NOTE: Keep Sanitized Anchor Name algorithm in sync with package
+//       github.com/shurcooL/sanitized_anchor_name.
+//       Otherwise, users of sanitized_anchor_name will get anchor names
+//       that are incompatible with those generated by blackfriday.
diff --git a/vendor/github.com/russross/blackfriday/esc.go b/vendor/github.com/russross/blackfriday/esc.go
deleted file mode 100644
index 6385f27c..00000000
--- a/vendor/github.com/russross/blackfriday/esc.go
+++ /dev/null
@@ -1,34 +0,0 @@
-package blackfriday
-
-import (
-	"html"
-	"io"
-)
-
-var htmlEscaper = [256][]byte{
-	'&': []byte("&amp;"),
-	'<': []byte("&lt;"),
-	'>': []byte("&gt;"),
-	'"': []byte("&quot;"),
-}
-
-func escapeHTML(w io.Writer, s []byte) {
-	var start, end int
-	for end < len(s) {
-		escSeq := htmlEscaper[s[end]]
-		if escSeq != nil {
-			w.Write(s[start:end])
-			w.Write(escSeq)
-			start = end + 1
-		}
-		end++
-	}
-	if start < len(s) && end <= len(s) {
-		w.Write(s[start:end])
-	}
-}
-
-func escLink(w io.Writer, text []byte) {
-	unesc := html.UnescapeString(string(text))
-	escapeHTML(w, []byte(unesc))
-}
diff --git a/vendor/github.com/russross/blackfriday/go.mod b/vendor/github.com/russross/blackfriday/go.mod
new file mode 100644
index 00000000..b05561a0
--- /dev/null
+++ b/vendor/github.com/russross/blackfriday/go.mod
@@ -0,0 +1 @@
+module github.com/russross/blackfriday
diff --git a/vendor/github.com/russross/blackfriday/html.go b/vendor/github.com/russross/blackfriday/html.go
index 25fb185e..e0a6c69c 100644
--- a/vendor/github.com/russross/blackfriday/html.go
+++ b/vendor/github.com/russross/blackfriday/html.go
@@ -18,62 +18,46 @@ package blackfriday
 import (
 	"bytes"
 	"fmt"
-	"io"
 	"regexp"
+	"strconv"
 	"strings"
 )
 
-// HTMLFlags control optional behavior of HTML renderer.
-type HTMLFlags int
-
-// HTML renderer configuration options.
+// Html renderer configuration options.
 const (
-	HTMLFlagsNone           HTMLFlags = 0
-	SkipHTML                HTMLFlags = 1 << iota // Skip preformatted HTML blocks
-	SkipImages                                    // Skip embedded images
-	SkipLinks                                     // Skip all links
-	Safelink                                      // Only link to trusted protocols
-	NofollowLinks                                 // Only link with rel="nofollow"
-	NoreferrerLinks                               // Only link with rel="noreferrer"
-	HrefTargetBlank                               // Add a blank target
-	CompletePage                                  // Generate a complete HTML page
-	UseXHTML                                      // Generate XHTML output instead of HTML
-	FootnoteReturnLinks                           // Generate a link at the end of a footnote to return to the source
-	Smartypants                                   // Enable smart punctuation substitutions
-	SmartypantsFractions                          // Enable smart fractions (with Smartypants)
-	SmartypantsDashes                             // Enable smart dashes (with Smartypants)
-	SmartypantsLatexDashes                        // Enable LaTeX-style dashes (with Smartypants)
-	SmartypantsAngledQuotes                       // Enable angled double quotes (with Smartypants) for double quotes rendering
-	SmartypantsQuotesNBSP                         // Enable « French guillemets » (with Smartypants)
-	TOC                                           // Generate a table of contents
+	HTML_SKIP_HTML                 = 1 << iota // skip preformatted HTML blocks
+	HTML_SKIP_STYLE                            // skip embedded <style> elements
+	HTML_SKIP_IMAGES                           // skip embedded images
+	HTML_SKIP_LINKS                            // skip all links
+	HTML_SAFELINK                              // only link to trusted protocols
+	HTML_NOFOLLOW_LINKS                        // only link with rel="nofollow"
+	HTML_NOREFERRER_LINKS                      // only link with rel="noreferrer"
+	HTML_HREF_TARGET_BLANK                     // add a blank target
+	HTML_TOC                                   // generate a table of contents
+	HTML_OMIT_CONTENTS                         // skip the main contents (for a standalone table of contents)
+	HTML_COMPLETE_PAGE                         // generate a complete HTML page
+	HTML_USE_XHTML                             // generate XHTML output instead of HTML
+	HTML_USE_SMARTYPANTS                       // enable smart punctuation substitutions
+	HTML_SMARTYPANTS_FRACTIONS                 // enable smart fractions (with HTML_USE_SMARTYPANTS)
+	HTML_SMARTYPANTS_DASHES                    // enable smart dashes (with HTML_USE_SMARTYPANTS)
+	HTML_SMARTYPANTS_LATEX_DASHES              // enable LaTeX-style dashes (with HTML_USE_SMARTYPANTS and HTML_SMARTYPANTS_DASHES)
+	HTML_SMARTYPANTS_ANGLED_QUOTES             // enable angled double quotes (with HTML_USE_SMARTYPANTS) for double quotes rendering
+	HTML_SMARTYPANTS_QUOTES_NBSP               // enable "French guillemets" (with HTML_USE_SMARTYPANTS)
+	HTML_FOOTNOTE_RETURN_LINKS                 // generate a link at the end of a footnote to return to the source
 )
 
 var (
-	htmlTagRe = regexp.MustCompile("(?i)^" + htmlTag)
-)
+	alignments = []string{
+		"left",
+		"right",
+		"center",
+	}
 
-const (
-	htmlTag = "(?:" + openTag + "|" + closeTag + "|" + htmlComment + "|" +
-		processingInstruction + "|" + declaration + "|" + cdata + ")"
-	closeTag              = "</" + tagName + "\\s*[>]"
-	openTag               = "<" + tagName + attribute + "*" + "\\s*/?>"
-	attribute             = "(?:" + "\\s+" + attributeName + attributeValueSpec + "?)"
-	attributeValue        = "(?:" + unquotedValue + "|" + singleQuotedValue + "|" + doubleQuotedValue + ")"
-	attributeValueSpec    = "(?:" + "\\s*=" + "\\s*" + attributeValue + ")"
-	attributeName         = "[a-zA-Z_:][a-zA-Z0-9:._-]*"
-	cdata                 = "<!\\[CDATA\\[[\\s\\S]*?\\]\\]>"
-	declaration           = "<![A-Z]+" + "\\s+[^>]*>"
-	doubleQuotedValue     = "\"[^\"]*\""
-	htmlComment           = "<!---->|<!--(?:-?[^>-])(?:-?[^-])*-->"
-	processingInstruction = "[<][?].*?[?][>]"
-	singleQuotedValue     = "'[^']*'"
-	tagName               = "[A-Za-z][A-Za-z0-9-]*"
-	unquotedValue         = "[^\"'=<>`\\x00-\\x20]+"
+	// TODO: improve this regexp to catch all possible entities:
+	htmlEntity = regexp.MustCompile(`&[a-z]{2,5};`)
 )
 
-// HTMLRendererParameters is a collection of supplementary parameters tweaking
-// the behavior of various parts of HTML renderer.
-type HTMLRendererParameters struct {
+type HtmlRendererParameters struct {
 	// Prepend this text to each relative URL.
 	AbsolutePrefix string
 	// Add this text to each footnote anchor, to ensure uniqueness.
@@ -82,34 +66,34 @@ type HTMLRendererParameters struct {
 	// HTML_FOOTNOTE_RETURN_LINKS flag is enabled. If blank, the string
 	// <sup>[return]</sup> is used.
 	FootnoteReturnLinkContents string
-	// If set, add this text to the front of each Heading ID, to ensure
+	// If set, add this text to the front of each Header ID, to ensure
 	// uniqueness.
-	HeadingIDPrefix string
-	// If set, add this text to the back of each Heading ID, to ensure uniqueness.
-	HeadingIDSuffix string
-
-	Title string // Document title (used if CompletePage is set)
-	CSS   string // Optional CSS file URL (used if CompletePage is set)
-	Icon  string // Optional icon file URL (used if CompletePage is set)
-
-	Flags HTMLFlags // Flags allow customizing this renderer's behavior
+	HeaderIDPrefix string
+	// If set, add this text to the back of each Header ID, to ensure uniqueness.
+	HeaderIDSuffix string
 }
 
-// HTMLRenderer is a type that implements the Renderer interface for HTML output.
+// Html is a type that implements the Renderer interface for HTML output.
 //
-// Do not create this directly, instead use the NewHTMLRenderer function.
-type HTMLRenderer struct {
-	HTMLRendererParameters
-
+// Do not create this directly, instead use the HtmlRenderer function.
+type Html struct {
+	flags    int    // HTML_* options
 	closeTag string // how to end singleton tags: either " />" or ">"
+	title    string // document title
+	css      string // optional css file url (used with HTML_COMPLETE_PAGE)
 
-	// Track heading IDs to prevent ID collision in a single generation.
-	headingIDs map[string]int
+	parameters HtmlRendererParameters
 
-	lastOutputLen int
-	disableTags   int
+	// table of contents data
+	tocMarker    int
+	headerCount  int
+	currentLevel int
+	toc          *bytes.Buffer
 
-	sr *SPRenderer
+	// Track header IDs to prevent ID collision in a single generation.
+	headerIDs map[string]int
+
+	smartypants *smartypantsRenderer
 }
 
 const (
@@ -117,824 +101,838 @@ const (
 	htmlClose  = ">"
 )
 
-// NewHTMLRenderer creates and configures an HTMLRenderer object, which
+// HtmlRenderer creates and configures an Html object, which
 // satisfies the Renderer interface.
-func NewHTMLRenderer(params HTMLRendererParameters) *HTMLRenderer {
+//
+// flags is a set of HTML_* options ORed together.
+// title is the title of the document, and css is a URL for the document's
+// stylesheet.
+// title and css are only used when HTML_COMPLETE_PAGE is selected.
+func HtmlRenderer(flags int, title string, css string) Renderer {
+	return HtmlRendererWithParameters(flags, title, css, HtmlRendererParameters{})
+}
+
+func HtmlRendererWithParameters(flags int, title string,
+	css string, renderParameters HtmlRendererParameters) Renderer {
 	// configure the rendering engine
 	closeTag := htmlClose
-	if params.Flags&UseXHTML != 0 {
+	if flags&HTML_USE_XHTML != 0 {
 		closeTag = xhtmlClose
 	}
 
-	if params.FootnoteReturnLinkContents == "" {
-		params.FootnoteReturnLinkContents = `<sup>[return]</sup>`
+	if renderParameters.FootnoteReturnLinkContents == "" {
+		renderParameters.FootnoteReturnLinkContents = `<sup>[return]</sup>`
 	}
 
-	return &HTMLRenderer{
-		HTMLRendererParameters: params,
-
+	return &Html{
+		flags:      flags,
 		closeTag:   closeTag,
-		headingIDs: make(map[string]int),
+		title:      title,
+		css:        css,
+		parameters: renderParameters,
+
+		headerCount:  0,
+		currentLevel: 0,
+		toc:          new(bytes.Buffer),
 
-		sr: NewSmartypantsRenderer(params.Flags),
+		headerIDs: make(map[string]int),
+
+		smartypants: smartypants(flags),
 	}
 }
 
-func isHTMLTag(tag []byte, tagname string) bool {
-	found, _ := findHTMLTagPos(tag, tagname)
-	return found
+// Using if statements is a bit faster than a switch statement. As the compiler
+// improves, this should be unnecessary this is only worthwhile because
+// attrEscape is the single largest CPU user in normal use.
+// Also tried using map, but that gave a ~3x slowdown.
+func escapeSingleChar(char byte) (string, bool) {
+	if char == '"' {
+		return "&quot;", true
+	}
+	if char == '&' {
+		return "&amp;", true
+	}
+	if char == '<' {
+		return "&lt;", true
+	}
+	if char == '>' {
+		return "&gt;", true
+	}
+	return "", false
 }
 
-// Look for a character, but ignore it when it's in any kind of quotes, it
-// might be JavaScript
-func skipUntilCharIgnoreQuotes(html []byte, start int, char byte) int {
-	inSingleQuote := false
-	inDoubleQuote := false
-	inGraveQuote := false
-	i := start
-	for i < len(html) {
-		switch {
-		case html[i] == char && !inSingleQuote && !inDoubleQuote && !inGraveQuote:
-			return i
-		case html[i] == '\'':
-			inSingleQuote = !inSingleQuote
-		case html[i] == '"':
-			inDoubleQuote = !inDoubleQuote
-		case html[i] == '`':
-			inGraveQuote = !inGraveQuote
+func attrEscape(out *bytes.Buffer, src []byte) {
+	org := 0
+	for i, ch := range src {
+		if entity, ok := escapeSingleChar(ch); ok {
+			if i > org {
+				// copy all the normal characters since the last escape
+				out.Write(src[org:i])
+			}
+			org = i + 1
+			out.WriteString(entity)
 		}
-		i++
 	}
-	return start
+	if org < len(src) {
+		out.Write(src[org:])
+	}
 }
 
-func findHTMLTagPos(tag []byte, tagname string) (bool, int) {
-	i := 0
-	if i < len(tag) && tag[0] != '<' {
-		return false, -1
+func entityEscapeWithSkip(out *bytes.Buffer, src []byte, skipRanges [][]int) {
+	end := 0
+	for _, rang := range skipRanges {
+		attrEscape(out, src[end:rang[0]])
+		out.Write(src[rang[0]:rang[1]])
+		end = rang[1]
 	}
-	i++
-	i = skipSpace(tag, i)
+	attrEscape(out, src[end:])
+}
 
-	if i < len(tag) && tag[i] == '/' {
-		i++
+func (options *Html) GetFlags() int {
+	return options.flags
+}
+
+func (options *Html) TitleBlock(out *bytes.Buffer, text []byte) {
+	text = bytes.TrimPrefix(text, []byte("% "))
+	text = bytes.Replace(text, []byte("\n% "), []byte("\n"), -1)
+	out.WriteString("<h1 class=\"title\">")
+	out.Write(text)
+	out.WriteString("\n</h1>")
+}
+
+func (options *Html) Header(out *bytes.Buffer, text func() bool, level int, id string) {
+	marker := out.Len()
+	doubleSpace(out)
+
+	if id == "" && options.flags&HTML_TOC != 0 {
+		id = fmt.Sprintf("toc_%d", options.headerCount)
 	}
 
-	i = skipSpace(tag, i)
-	j := 0
-	for ; i < len(tag); i, j = i+1, j+1 {
-		if j >= len(tagname) {
-			break
+	if id != "" {
+		id = options.ensureUniqueHeaderID(id)
+
+		if options.parameters.HeaderIDPrefix != "" {
+			id = options.parameters.HeaderIDPrefix + id
 		}
 
-		if strings.ToLower(string(tag[i]))[0] != tagname[j] {
-			return false, -1
+		if options.parameters.HeaderIDSuffix != "" {
+			id = id + options.parameters.HeaderIDSuffix
 		}
+
+		out.WriteString(fmt.Sprintf("<h%d id=\"%s\">", level, id))
+	} else {
+		out.WriteString(fmt.Sprintf("<h%d>", level))
 	}
 
-	if i == len(tag) {
-		return false, -1
+	tocMarker := out.Len()
+	if !text() {
+		out.Truncate(marker)
+		return
 	}
 
-	rightAngle := skipUntilCharIgnoreQuotes(tag, i, '>')
-	if rightAngle >= i {
-		return true, rightAngle
+	// are we building a table of contents?
+	if options.flags&HTML_TOC != 0 {
+		options.TocHeaderWithAnchor(out.Bytes()[tocMarker:], level, id)
 	}
 
-	return false, -1
+	out.WriteString(fmt.Sprintf("</h%d>\n", level))
 }
 
-func skipSpace(tag []byte, i int) int {
-	for i < len(tag) && isspace(tag[i]) {
-		i++
+func (options *Html) BlockHtml(out *bytes.Buffer, text []byte) {
+	if options.flags&HTML_SKIP_HTML != 0 {
+		return
 	}
-	return i
+
+	doubleSpace(out)
+	out.Write(text)
+	out.WriteByte('\n')
 }
 
-func isRelativeLink(link []byte) (yes bool) {
-	// a tag begin with '#'
-	if link[0] == '#' {
-		return true
-	}
+func (options *Html) HRule(out *bytes.Buffer) {
+	doubleSpace(out)
+	out.WriteString("<hr")
+	out.WriteString(options.closeTag)
+	out.WriteByte('\n')
+}
 
-	// link begin with '/' but not '//', the second maybe a protocol relative link
-	if len(link) >= 2 && link[0] == '/' && link[1] != '/' {
-		return true
-	}
+func (options *Html) BlockCode(out *bytes.Buffer, text []byte, info string) {
+	doubleSpace(out)
 
-	// only the root '/'
-	if len(link) == 1 && link[0] == '/' {
-		return true
+	endOfLang := strings.IndexAny(info, "\t ")
+	if endOfLang < 0 {
+		endOfLang = len(info)
 	}
-
-	// current directory : begin with "./"
-	if bytes.HasPrefix(link, []byte("./")) {
-		return true
+	lang := info[:endOfLang]
+	if len(lang) == 0 || lang == "." {
+		out.WriteString("<pre><code>")
+	} else {
+		out.WriteString("<pre><code class=\"language-")
+		attrEscape(out, []byte(lang))
+		out.WriteString("\">")
 	}
+	attrEscape(out, text)
+	out.WriteString("</code></pre>\n")
+}
 
-	// parent directory : begin with "../"
-	if bytes.HasPrefix(link, []byte("../")) {
-		return true
-	}
+func (options *Html) BlockQuote(out *bytes.Buffer, text []byte) {
+	doubleSpace(out)
+	out.WriteString("<blockquote>\n")
+	out.Write(text)
+	out.WriteString("</blockquote>\n")
+}
 
-	return false
+func (options *Html) Table(out *bytes.Buffer, header []byte, body []byte, columnData []int) {
+	doubleSpace(out)
+	out.WriteString("<table>\n<thead>\n")
+	out.Write(header)
+	out.WriteString("</thead>\n\n<tbody>\n")
+	out.Write(body)
+	out.WriteString("</tbody>\n</table>\n")
 }
 
-func (r *HTMLRenderer) ensureUniqueHeadingID(id string) string {
-	for count, found := r.headingIDs[id]; found; count, found = r.headingIDs[id] {
-		tmp := fmt.Sprintf("%s-%d", id, count+1)
+func (options *Html) TableRow(out *bytes.Buffer, text []byte) {
+	doubleSpace(out)
+	out.WriteString("<tr>\n")
+	out.Write(text)
+	out.WriteString("\n</tr>\n")
+}
 
-		if _, tmpFound := r.headingIDs[tmp]; !tmpFound {
-			r.headingIDs[id] = count + 1
-			id = tmp
-		} else {
-			id = id + "-1"
-		}
+func (options *Html) TableHeaderCell(out *bytes.Buffer, text []byte, align int) {
+	doubleSpace(out)
+	switch align {
+	case TABLE_ALIGNMENT_LEFT:
+		out.WriteString("<th align=\"left\">")
+	case TABLE_ALIGNMENT_RIGHT:
+		out.WriteString("<th align=\"right\">")
+	case TABLE_ALIGNMENT_CENTER:
+		out.WriteString("<th align=\"center\">")
+	default:
+		out.WriteString("<th>")
 	}
 
-	if _, found := r.headingIDs[id]; !found {
-		r.headingIDs[id] = 0
+	out.Write(text)
+	out.WriteString("</th>")
+}
+
+func (options *Html) TableCell(out *bytes.Buffer, text []byte, align int) {
+	doubleSpace(out)
+	switch align {
+	case TABLE_ALIGNMENT_LEFT:
+		out.WriteString("<td align=\"left\">")
+	case TABLE_ALIGNMENT_RIGHT:
+		out.WriteString("<td align=\"right\">")
+	case TABLE_ALIGNMENT_CENTER:
+		out.WriteString("<td align=\"center\">")
+	default:
+		out.WriteString("<td>")
 	}
 
-	return id
+	out.Write(text)
+	out.WriteString("</td>")
 }
 
-func (r *HTMLRenderer) addAbsPrefix(link []byte) []byte {
-	if r.AbsolutePrefix != "" && isRelativeLink(link) && link[0] != '.' {
-		newDest := r.AbsolutePrefix
-		if link[0] != '/' {
-			newDest += "/"
-		}
-		newDest += string(link)
-		return []byte(newDest)
-	}
-	return link
+func (options *Html) Footnotes(out *bytes.Buffer, text func() bool) {
+	out.WriteString("<div class=\"footnotes\">\n")
+	options.HRule(out)
+	options.List(out, text, LIST_TYPE_ORDERED)
+	out.WriteString("</div>\n")
+}
+
+func (options *Html) FootnoteItem(out *bytes.Buffer, name, text []byte, flags int) {
+	if flags&LIST_ITEM_CONTAINS_BLOCK != 0 || flags&LIST_ITEM_BEGINNING_OF_LIST != 0 {
+		doubleSpace(out)
+	}
+	slug := slugify(name)
+	out.WriteString(`<li id="`)
+	out.WriteString(`fn:`)
+	out.WriteString(options.parameters.FootnoteAnchorPrefix)
+	out.Write(slug)
+	out.WriteString(`">`)
+	out.Write(text)
+	if options.flags&HTML_FOOTNOTE_RETURN_LINKS != 0 {
+		out.WriteString(` <a class="footnote-return" href="#`)
+		out.WriteString(`fnref:`)
+		out.WriteString(options.parameters.FootnoteAnchorPrefix)
+		out.Write(slug)
+		out.WriteString(`">`)
+		out.WriteString(options.parameters.FootnoteReturnLinkContents)
+		out.WriteString(`</a>`)
+	}
+	out.WriteString("</li>\n")
 }
 
-func appendLinkAttrs(attrs []string, flags HTMLFlags, link []byte) []string {
-	if isRelativeLink(link) {
-		return attrs
+func (options *Html) List(out *bytes.Buffer, text func() bool, flags int) {
+	marker := out.Len()
+	doubleSpace(out)
+
+	if flags&LIST_TYPE_DEFINITION != 0 {
+		out.WriteString("<dl>")
+	} else if flags&LIST_TYPE_ORDERED != 0 {
+		out.WriteString("<ol>")
+	} else {
+		out.WriteString("<ul>")
 	}
-	val := []string{}
-	if flags&NofollowLinks != 0 {
-		val = append(val, "nofollow")
+	if !text() {
+		out.Truncate(marker)
+		return
 	}
-	if flags&NoreferrerLinks != 0 {
-		val = append(val, "noreferrer")
+	if flags&LIST_TYPE_DEFINITION != 0 {
+		out.WriteString("</dl>\n")
+	} else if flags&LIST_TYPE_ORDERED != 0 {
+		out.WriteString("</ol>\n")
+	} else {
+		out.WriteString("</ul>\n")
+	}
+}
+
+func (options *Html) ListItem(out *bytes.Buffer, text []byte, flags int) {
+	if (flags&LIST_ITEM_CONTAINS_BLOCK != 0 && flags&LIST_TYPE_DEFINITION == 0) ||
+		flags&LIST_ITEM_BEGINNING_OF_LIST != 0 {
+		doubleSpace(out)
 	}
-	if flags&HrefTargetBlank != 0 {
-		attrs = append(attrs, "target=\"_blank\"")
+	if flags&LIST_TYPE_TERM != 0 {
+		out.WriteString("<dt>")
+	} else if flags&LIST_TYPE_DEFINITION != 0 {
+		out.WriteString("<dd>")
+	} else {
+		out.WriteString("<li>")
 	}
-	if len(val) == 0 {
-		return attrs
+	out.Write(text)
+	if flags&LIST_TYPE_TERM != 0 {
+		out.WriteString("</dt>\n")
+	} else if flags&LIST_TYPE_DEFINITION != 0 {
+		out.WriteString("</dd>\n")
+	} else {
+		out.WriteString("</li>\n")
 	}
-	attr := fmt.Sprintf("rel=%q", strings.Join(val, " "))
-	return append(attrs, attr)
 }
 
-func isMailto(link []byte) bool {
-	return bytes.HasPrefix(link, []byte("mailto:"))
-}
+func (options *Html) Paragraph(out *bytes.Buffer, text func() bool) {
+	marker := out.Len()
+	doubleSpace(out)
 
-func needSkipLink(flags HTMLFlags, dest []byte) bool {
-	if flags&SkipLinks != 0 {
-		return true
+	out.WriteString("<p>")
+	if !text() {
+		out.Truncate(marker)
+		return
 	}
-	return flags&Safelink != 0 && !isSafeLink(dest) && !isMailto(dest)
+	out.WriteString("</p>\n")
 }
 
-func isSmartypantable(node *Node) bool {
-	pt := node.Parent.Type
-	return pt != Link && pt != CodeBlock && pt != Code
-}
+func (options *Html) AutoLink(out *bytes.Buffer, link []byte, kind int) {
+	skipRanges := htmlEntity.FindAllIndex(link, -1)
+	if options.flags&HTML_SAFELINK != 0 && !isSafeLink(link) && kind != LINK_TYPE_EMAIL {
+		// mark it but don't link it if it is not a safe link: no smartypants
+		out.WriteString("<tt>")
+		entityEscapeWithSkip(out, link, skipRanges)
+		out.WriteString("</tt>")
+		return
+	}
 
-func appendLanguageAttr(attrs []string, info []byte) []string {
-	if len(info) == 0 {
-		return attrs
+	out.WriteString("<a href=\"")
+	if kind == LINK_TYPE_EMAIL {
+		out.WriteString("mailto:")
+	} else {
+		options.maybeWriteAbsolutePrefix(out, link)
 	}
-	endOfLang := bytes.IndexAny(info, "\t ")
-	if endOfLang < 0 {
-		endOfLang = len(info)
+
+	entityEscapeWithSkip(out, link, skipRanges)
+
+	var relAttrs []string
+	if options.flags&HTML_NOFOLLOW_LINKS != 0 && !isRelativeLink(link) {
+		relAttrs = append(relAttrs, "nofollow")
+	}
+	if options.flags&HTML_NOREFERRER_LINKS != 0 && !isRelativeLink(link) {
+		relAttrs = append(relAttrs, "noreferrer")
+	}
+	if len(relAttrs) > 0 {
+		out.WriteString(fmt.Sprintf("\" rel=\"%s", strings.Join(relAttrs, " ")))
 	}
-	return append(attrs, fmt.Sprintf("class=\"language-%s\"", info[:endOfLang]))
-}
 
-func (r *HTMLRenderer) tag(w io.Writer, name []byte, attrs []string) {
-	w.Write(name)
-	if len(attrs) > 0 {
-		w.Write(spaceBytes)
-		w.Write([]byte(strings.Join(attrs, " ")))
+	// blank target only add to external link
+	if options.flags&HTML_HREF_TARGET_BLANK != 0 && !isRelativeLink(link) {
+		out.WriteString("\" target=\"_blank")
+	}
+
+	out.WriteString("\">")
+
+	// Pretty print: if we get an email address as
+	// an actual URI, e.g. `mailto:foo@bar.com`, we don't
+	// want to print the `mailto:` prefix
+	switch {
+	case bytes.HasPrefix(link, []byte("mailto://")):
+		attrEscape(out, link[len("mailto://"):])
+	case bytes.HasPrefix(link, []byte("mailto:")):
+		attrEscape(out, link[len("mailto:"):])
+	default:
+		entityEscapeWithSkip(out, link, skipRanges)
 	}
-	w.Write(gtBytes)
-	r.lastOutputLen = 1
-}
 
-func footnoteRef(prefix string, node *Node) []byte {
-	urlFrag := prefix + string(slugify(node.Destination))
-	anchor := fmt.Sprintf(`<a rel="footnote" href="#fn:%s">%d</a>`, urlFrag, node.NoteID)
-	return []byte(fmt.Sprintf(`<sup class="footnote-ref" id="fnref:%s">%s</sup>`, urlFrag, anchor))
+	out.WriteString("</a>")
 }
 
-func footnoteItem(prefix string, slug []byte) []byte {
-	return []byte(fmt.Sprintf(`<li id="fn:%s%s">`, prefix, slug))
+func (options *Html) CodeSpan(out *bytes.Buffer, text []byte) {
+	out.WriteString("<code>")
+	attrEscape(out, text)
+	out.WriteString("</code>")
 }
 
-func footnoteReturnLink(prefix, returnLink string, slug []byte) []byte {
-	const format = ` <a class="footnote-return" href="#fnref:%s%s">%s</a>`
-	return []byte(fmt.Sprintf(format, prefix, slug, returnLink))
+func (options *Html) DoubleEmphasis(out *bytes.Buffer, text []byte) {
+	out.WriteString("<strong>")
+	out.Write(text)
+	out.WriteString("</strong>")
 }
 
-func itemOpenCR(node *Node) bool {
-	if node.Prev == nil {
-		return false
+func (options *Html) Emphasis(out *bytes.Buffer, text []byte) {
+	if len(text) == 0 {
+		return
 	}
-	ld := node.Parent.ListData
-	return !ld.Tight && ld.ListFlags&ListTypeDefinition == 0
+	out.WriteString("<em>")
+	out.Write(text)
+	out.WriteString("</em>")
 }
 
-func skipParagraphTags(node *Node) bool {
-	grandparent := node.Parent.Parent
-	if grandparent == nil || grandparent.Type != List {
-		return false
+func (options *Html) maybeWriteAbsolutePrefix(out *bytes.Buffer, link []byte) {
+	if options.parameters.AbsolutePrefix != "" && isRelativeLink(link) && link[0] != '.' {
+		out.WriteString(options.parameters.AbsolutePrefix)
+		if link[0] != '/' {
+			out.WriteByte('/')
+		}
 	}
-	tightOrTerm := grandparent.Tight || node.Parent.ListFlags&ListTypeTerm != 0
-	return grandparent.Type == List && tightOrTerm
 }
 
-func cellAlignment(align CellAlignFlags) string {
-	switch align {
-	case TableAlignmentLeft:
-		return "left"
-	case TableAlignmentRight:
-		return "right"
-	case TableAlignmentCenter:
-		return "center"
-	default:
-		return ""
+func (options *Html) Image(out *bytes.Buffer, link []byte, title []byte, alt []byte) {
+	if options.flags&HTML_SKIP_IMAGES != 0 {
+		return
+	}
+
+	out.WriteString("<img src=\"")
+	options.maybeWriteAbsolutePrefix(out, link)
+	attrEscape(out, link)
+	out.WriteString("\" alt=\"")
+	if len(alt) > 0 {
+		attrEscape(out, alt)
+	}
+	if len(title) > 0 {
+		out.WriteString("\" title=\"")
+		attrEscape(out, title)
 	}
+
+	out.WriteByte('"')
+	out.WriteString(options.closeTag)
 }
 
-func (r *HTMLRenderer) out(w io.Writer, text []byte) {
-	if r.disableTags > 0 {
-		w.Write(htmlTagRe.ReplaceAll(text, []byte{}))
-	} else {
-		w.Write(text)
+func (options *Html) LineBreak(out *bytes.Buffer) {
+	out.WriteString("<br")
+	out.WriteString(options.closeTag)
+	out.WriteByte('\n')
+}
+
+func (options *Html) Link(out *bytes.Buffer, link []byte, title []byte, content []byte) {
+	if options.flags&HTML_SKIP_LINKS != 0 {
+		// write the link text out but don't link it, just mark it with typewriter font
+		out.WriteString("<tt>")
+		attrEscape(out, content)
+		out.WriteString("</tt>")
+		return
+	}
+
+	if options.flags&HTML_SAFELINK != 0 && !isSafeLink(link) {
+		// write the link text out but don't link it, just mark it with typewriter font
+		out.WriteString("<tt>")
+		attrEscape(out, content)
+		out.WriteString("</tt>")
+		return
+	}
+
+	out.WriteString("<a href=\"")
+	options.maybeWriteAbsolutePrefix(out, link)
+	attrEscape(out, link)
+	if len(title) > 0 {
+		out.WriteString("\" title=\"")
+		attrEscape(out, title)
+	}
+	var relAttrs []string
+	if options.flags&HTML_NOFOLLOW_LINKS != 0 && !isRelativeLink(link) {
+		relAttrs = append(relAttrs, "nofollow")
+	}
+	if options.flags&HTML_NOREFERRER_LINKS != 0 && !isRelativeLink(link) {
+		relAttrs = append(relAttrs, "noreferrer")
+	}
+	if len(relAttrs) > 0 {
+		out.WriteString(fmt.Sprintf("\" rel=\"%s", strings.Join(relAttrs, " ")))
 	}
-	r.lastOutputLen = len(text)
+
+	// blank target only add to external link
+	if options.flags&HTML_HREF_TARGET_BLANK != 0 && !isRelativeLink(link) {
+		out.WriteString("\" target=\"_blank")
+	}
+
+	out.WriteString("\">")
+	out.Write(content)
+	out.WriteString("</a>")
+	return
 }
 
-func (r *HTMLRenderer) cr(w io.Writer) {
-	if r.lastOutputLen > 0 {
-		r.out(w, nlBytes)
+func (options *Html) RawHtmlTag(out *bytes.Buffer, text []byte) {
+	if options.flags&HTML_SKIP_HTML != 0 {
+		return
+	}
+	if options.flags&HTML_SKIP_STYLE != 0 && isHtmlTag(text, "style") {
+		return
 	}
+	if options.flags&HTML_SKIP_LINKS != 0 && isHtmlTag(text, "a") {
+		return
+	}
+	if options.flags&HTML_SKIP_IMAGES != 0 && isHtmlTag(text, "img") {
+		return
+	}
+	out.Write(text)
 }
 
-var (
-	nlBytes    = []byte{'\n'}
-	gtBytes    = []byte{'>'}
-	spaceBytes = []byte{' '}
-)
+func (options *Html) TripleEmphasis(out *bytes.Buffer, text []byte) {
+	out.WriteString("<strong><em>")
+	out.Write(text)
+	out.WriteString("</em></strong>")
+}
 
-var (
-	brTag              = []byte("<br>")
-	brXHTMLTag         = []byte("<br />")
-	emTag              = []byte("<em>")
-	emCloseTag         = []byte("</em>")
-	strongTag          = []byte("<strong>")
-	strongCloseTag     = []byte("</strong>")
-	delTag             = []byte("<del>")
-	delCloseTag        = []byte("</del>")
-	ttTag              = []byte("<tt>")
-	ttCloseTag         = []byte("</tt>")
-	aTag               = []byte("<a")
-	aCloseTag          = []byte("</a>")
-	preTag             = []byte("<pre>")
-	preCloseTag        = []byte("</pre>")
-	codeTag            = []byte("<code>")
-	codeCloseTag       = []byte("</code>")
-	pTag               = []byte("<p>")
-	pCloseTag          = []byte("</p>")
-	blockquoteTag      = []byte("<blockquote>")
-	blockquoteCloseTag = []byte("</blockquote>")
-	hrTag              = []byte("<hr>")
-	hrXHTMLTag         = []byte("<hr />")
-	ulTag              = []byte("<ul>")
-	ulCloseTag         = []byte("</ul>")
-	olTag              = []byte("<ol>")
-	olCloseTag         = []byte("</ol>")
-	dlTag              = []byte("<dl>")
-	dlCloseTag         = []byte("</dl>")
-	liTag              = []byte("<li>")
-	liCloseTag         = []byte("</li>")
-	ddTag              = []byte("<dd>")
-	ddCloseTag         = []byte("</dd>")
-	dtTag              = []byte("<dt>")
-	dtCloseTag         = []byte("</dt>")
-	tableTag           = []byte("<table>")
-	tableCloseTag      = []byte("</table>")
-	tdTag              = []byte("<td")
-	tdCloseTag         = []byte("</td>")
-	thTag              = []byte("<th")
-	thCloseTag         = []byte("</th>")
-	theadTag           = []byte("<thead>")
-	theadCloseTag      = []byte("</thead>")
-	tbodyTag           = []byte("<tbody>")
-	tbodyCloseTag      = []byte("</tbody>")
-	trTag              = []byte("<tr>")
-	trCloseTag         = []byte("</tr>")
-	h1Tag              = []byte("<h1")
-	h1CloseTag         = []byte("</h1>")
-	h2Tag              = []byte("<h2")
-	h2CloseTag         = []byte("</h2>")
-	h3Tag              = []byte("<h3")
-	h3CloseTag         = []byte("</h3>")
-	h4Tag              = []byte("<h4")
-	h4CloseTag         = []byte("</h4>")
-	h5Tag              = []byte("<h5")
-	h5CloseTag         = []byte("</h5>")
-	h6Tag              = []byte("<h6")
-	h6CloseTag         = []byte("</h6>")
-
-	footnotesDivBytes      = []byte("\n<div class=\"footnotes\">\n\n")
-	footnotesCloseDivBytes = []byte("\n</div>\n")
-)
+func (options *Html) StrikeThrough(out *bytes.Buffer, text []byte) {
+	out.WriteString("<del>")
+	out.Write(text)
+	out.WriteString("</del>")
+}
 
-func headingTagsFromLevel(level int) ([]byte, []byte) {
-	switch level {
-	case 1:
-		return h1Tag, h1CloseTag
-	case 2:
-		return h2Tag, h2CloseTag
-	case 3:
-		return h3Tag, h3CloseTag
-	case 4:
-		return h4Tag, h4CloseTag
-	case 5:
-		return h5Tag, h5CloseTag
-	default:
-		return h6Tag, h6CloseTag
-	}
+func (options *Html) FootnoteRef(out *bytes.Buffer, ref []byte, id int) {
+	slug := slugify(ref)
+	out.WriteString(`<sup class="footnote-ref" id="`)
+	out.WriteString(`fnref:`)
+	out.WriteString(options.parameters.FootnoteAnchorPrefix)
+	out.Write(slug)
+	out.WriteString(`"><a href="#`)
+	out.WriteString(`fn:`)
+	out.WriteString(options.parameters.FootnoteAnchorPrefix)
+	out.Write(slug)
+	out.WriteString(`">`)
+	out.WriteString(strconv.Itoa(id))
+	out.WriteString(`</a></sup>`)
+}
+
+func (options *Html) Entity(out *bytes.Buffer, entity []byte) {
+	out.Write(entity)
 }
 
-func (r *HTMLRenderer) outHRTag(w io.Writer) {
-	if r.Flags&UseXHTML == 0 {
-		r.out(w, hrTag)
+func (options *Html) NormalText(out *bytes.Buffer, text []byte) {
+	if options.flags&HTML_USE_SMARTYPANTS != 0 {
+		options.Smartypants(out, text)
 	} else {
-		r.out(w, hrXHTMLTag)
+		attrEscape(out, text)
 	}
 }
 
-// RenderNode is a default renderer of a single node of a syntax tree. For
-// block nodes it will be called twice: first time with entering=true, second
-// time with entering=false, so that it could know when it's working on an open
-// tag and when on close. It writes the result to w.
-//
-// The return value is a way to tell the calling walker to adjust its walk
-// pattern: e.g. it can terminate the traversal by returning Terminate. Or it
-// can ask the walker to skip a subtree of this node by returning SkipChildren.
-// The typical behavior is to return GoToNext, which asks for the usual
-// traversal to the next node.
-func (r *HTMLRenderer) RenderNode(w io.Writer, node *Node, entering bool) WalkStatus {
-	attrs := []string{}
-	switch node.Type {
-	case Text:
-		if r.Flags&Smartypants != 0 {
-			var tmp bytes.Buffer
-			escapeHTML(&tmp, node.Literal)
-			r.sr.Process(w, tmp.Bytes())
-		} else {
-			if node.Parent.Type == Link {
-				escLink(w, node.Literal)
-			} else {
-				escapeHTML(w, node.Literal)
-			}
-		}
-	case Softbreak:
-		r.cr(w)
-		// TODO: make it configurable via out(renderer.softbreak)
-	case Hardbreak:
-		if r.Flags&UseXHTML == 0 {
-			r.out(w, brTag)
-		} else {
-			r.out(w, brXHTMLTag)
-		}
-		r.cr(w)
-	case Emph:
-		if entering {
-			r.out(w, emTag)
-		} else {
-			r.out(w, emCloseTag)
-		}
-	case Strong:
-		if entering {
-			r.out(w, strongTag)
-		} else {
-			r.out(w, strongCloseTag)
-		}
-	case Del:
-		if entering {
-			r.out(w, delTag)
-		} else {
-			r.out(w, delCloseTag)
-		}
-	case HTMLSpan:
-		if r.Flags&SkipHTML != 0 {
-			break
-		}
-		r.out(w, node.Literal)
-	case Link:
-		// mark it but don't link it if it is not a safe link: no smartypants
-		dest := node.LinkData.Destination
-		if needSkipLink(r.Flags, dest) {
-			if entering {
-				r.out(w, ttTag)
-			} else {
-				r.out(w, ttCloseTag)
-			}
-		} else {
-			if entering {
-				dest = r.addAbsPrefix(dest)
-				var hrefBuf bytes.Buffer
-				hrefBuf.WriteString("href=\"")
-				escLink(&hrefBuf, dest)
-				hrefBuf.WriteByte('"')
-				attrs = append(attrs, hrefBuf.String())
-				if node.NoteID != 0 {
-					r.out(w, footnoteRef(r.FootnoteAnchorPrefix, node))
-					break
-				}
-				attrs = appendLinkAttrs(attrs, r.Flags, dest)
-				if len(node.LinkData.Title) > 0 {
-					var titleBuff bytes.Buffer
-					titleBuff.WriteString("title=\"")
-					escapeHTML(&titleBuff, node.LinkData.Title)
-					titleBuff.WriteByte('"')
-					attrs = append(attrs, titleBuff.String())
-				}
-				r.tag(w, aTag, attrs)
-			} else {
-				if node.NoteID != 0 {
-					break
-				}
-				r.out(w, aCloseTag)
-			}
-		}
-	case Image:
-		if r.Flags&SkipImages != 0 {
-			return SkipChildren
-		}
-		if entering {
-			dest := node.LinkData.Destination
-			dest = r.addAbsPrefix(dest)
-			if r.disableTags == 0 {
-				//if options.safe && potentiallyUnsafe(dest) {
-				//out(w, `<img src="" alt="`)
-				//} else {
-				r.out(w, []byte(`<img src="`))
-				escLink(w, dest)
-				r.out(w, []byte(`" alt="`))
-				//}
-			}
-			r.disableTags++
-		} else {
-			r.disableTags--
-			if r.disableTags == 0 {
-				if node.LinkData.Title != nil {
-					r.out(w, []byte(`" title="`))
-					escapeHTML(w, node.LinkData.Title)
-				}
-				r.out(w, []byte(`" />`))
-			}
-		}
-	case Code:
-		r.out(w, codeTag)
-		escapeHTML(w, node.Literal)
-		r.out(w, codeCloseTag)
-	case Document:
-		break
-	case Paragraph:
-		if skipParagraphTags(node) {
-			break
-		}
-		if entering {
-			// TODO: untangle this clusterfuck about when the newlines need
-			// to be added and when not.
-			if node.Prev != nil {
-				switch node.Prev.Type {
-				case HTMLBlock, List, Paragraph, Heading, CodeBlock, BlockQuote, HorizontalRule:
-					r.cr(w)
-				}
-			}
-			if node.Parent.Type == BlockQuote && node.Prev == nil {
-				r.cr(w)
-			}
-			r.out(w, pTag)
-		} else {
-			r.out(w, pCloseTag)
-			if !(node.Parent.Type == Item && node.Next == nil) {
-				r.cr(w)
-			}
-		}
-	case BlockQuote:
-		if entering {
-			r.cr(w)
-			r.out(w, blockquoteTag)
-		} else {
-			r.out(w, blockquoteCloseTag)
-			r.cr(w)
-		}
-	case HTMLBlock:
-		if r.Flags&SkipHTML != 0 {
-			break
-		}
-		r.cr(w)
-		r.out(w, node.Literal)
-		r.cr(w)
-	case Heading:
-		openTag, closeTag := headingTagsFromLevel(node.Level)
-		if entering {
-			if node.IsTitleblock {
-				attrs = append(attrs, `class="title"`)
-			}
-			if node.HeadingID != "" {
-				id := r.ensureUniqueHeadingID(node.HeadingID)
-				if r.HeadingIDPrefix != "" {
-					id = r.HeadingIDPrefix + id
-				}
-				if r.HeadingIDSuffix != "" {
-					id = id + r.HeadingIDSuffix
-				}
-				attrs = append(attrs, fmt.Sprintf(`id="%s"`, id))
-			}
-			r.cr(w)
-			r.tag(w, openTag, attrs)
-		} else {
-			r.out(w, closeTag)
-			if !(node.Parent.Type == Item && node.Next == nil) {
-				r.cr(w)
-			}
-		}
-	case HorizontalRule:
-		r.cr(w)
-		r.outHRTag(w)
-		r.cr(w)
-	case List:
-		openTag := ulTag
-		closeTag := ulCloseTag
-		if node.ListFlags&ListTypeOrdered != 0 {
-			openTag = olTag
-			closeTag = olCloseTag
-		}
-		if node.ListFlags&ListTypeDefinition != 0 {
-			openTag = dlTag
-			closeTag = dlCloseTag
-		}
-		if entering {
-			if node.IsFootnotesList {
-				r.out(w, footnotesDivBytes)
-				r.outHRTag(w)
-				r.cr(w)
-			}
-			r.cr(w)
-			if node.Parent.Type == Item && node.Parent.Parent.Tight {
-				r.cr(w)
-			}
-			r.tag(w, openTag[:len(openTag)-1], attrs)
-			r.cr(w)
-		} else {
-			r.out(w, closeTag)
-			//cr(w)
-			//if node.parent.Type != Item {
-			//	cr(w)
-			//}
-			if node.Parent.Type == Item && node.Next != nil {
-				r.cr(w)
-			}
-			if node.Parent.Type == Document || node.Parent.Type == BlockQuote {
-				r.cr(w)
+func (options *Html) Smartypants(out *bytes.Buffer, text []byte) {
+	smrt := smartypantsData{false, false}
+
+	// first do normal entity escaping
+	var escaped bytes.Buffer
+	attrEscape(&escaped, text)
+	text = escaped.Bytes()
+
+	mark := 0
+	for i := 0; i < len(text); i++ {
+		if action := options.smartypants[text[i]]; action != nil {
+			if i > mark {
+				out.Write(text[mark:i])
 			}
-			if node.IsFootnotesList {
-				r.out(w, footnotesCloseDivBytes)
+
+			previousChar := byte(0)
+			if i > 0 {
+				previousChar = text[i-1]
 			}
+			i += action(out, &smrt, previousChar, text[i:])
+			mark = i + 1
 		}
-	case Item:
-		openTag := liTag
-		closeTag := liCloseTag
-		if node.ListFlags&ListTypeDefinition != 0 {
-			openTag = ddTag
-			closeTag = ddCloseTag
-		}
-		if node.ListFlags&ListTypeTerm != 0 {
-			openTag = dtTag
-			closeTag = dtCloseTag
+	}
+
+	if mark < len(text) {
+		out.Write(text[mark:])
+	}
+}
+
+func (options *Html) DocumentHeader(out *bytes.Buffer) {
+	if options.flags&HTML_COMPLETE_PAGE == 0 {
+		return
+	}
+
+	ending := ""
+	if options.flags&HTML_USE_XHTML != 0 {
+		out.WriteString("<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Transitional//EN\" ")
+		out.WriteString("\"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd\">\n")
+		out.WriteString("<html xmlns=\"http://www.w3.org/1999/xhtml\">\n")
+		ending = " /"
+	} else {
+		out.WriteString("<!DOCTYPE html>\n")
+		out.WriteString("<html>\n")
+	}
+	out.WriteString("<head>\n")
+	out.WriteString("  <title>")
+	options.NormalText(out, []byte(options.title))
+	out.WriteString("</title>\n")
+	out.WriteString("  <meta name=\"GENERATOR\" content=\"Blackfriday Markdown Processor v")
+	out.WriteString(VERSION)
+	out.WriteString("\"")
+	out.WriteString(ending)
+	out.WriteString(">\n")
+	out.WriteString("  <meta charset=\"utf-8\"")
+	out.WriteString(ending)
+	out.WriteString(">\n")
+	if options.css != "" {
+		out.WriteString("  <link rel=\"stylesheet\" type=\"text/css\" href=\"")
+		attrEscape(out, []byte(options.css))
+		out.WriteString("\"")
+		out.WriteString(ending)
+		out.WriteString(">\n")
+	}
+	out.WriteString("</head>\n")
+	out.WriteString("<body>\n")
+
+	options.tocMarker = out.Len()
+}
+
+func (options *Html) DocumentFooter(out *bytes.Buffer) {
+	// finalize and insert the table of contents
+	if options.flags&HTML_TOC != 0 {
+		options.TocFinalize()
+
+		// now we have to insert the table of contents into the document
+		var temp bytes.Buffer
+
+		// start by making a copy of everything after the document header
+		temp.Write(out.Bytes()[options.tocMarker:])
+
+		// now clear the copied material from the main output buffer
+		out.Truncate(options.tocMarker)
+
+		// corner case spacing issue
+		if options.flags&HTML_COMPLETE_PAGE != 0 {
+			out.WriteByte('\n')
 		}
-		if entering {
-			if itemOpenCR(node) {
-				r.cr(w)
-			}
-			if node.ListData.RefLink != nil {
-				slug := slugify(node.ListData.RefLink)
-				r.out(w, footnoteItem(r.FootnoteAnchorPrefix, slug))
-				break
-			}
-			r.out(w, openTag)
-		} else {
-			if node.ListData.RefLink != nil {
-				slug := slugify(node.ListData.RefLink)
-				if r.Flags&FootnoteReturnLinks != 0 {
-					r.out(w, footnoteReturnLink(r.FootnoteAnchorPrefix, r.FootnoteReturnLinkContents, slug))
-				}
-			}
-			r.out(w, closeTag)
-			r.cr(w)
+
+		// insert the table of contents
+		out.WriteString("<nav>\n")
+		out.Write(options.toc.Bytes())
+		out.WriteString("</nav>\n")
+
+		// corner case spacing issue
+		if options.flags&HTML_COMPLETE_PAGE == 0 && options.flags&HTML_OMIT_CONTENTS == 0 {
+			out.WriteByte('\n')
 		}
-	case CodeBlock:
-		attrs = appendLanguageAttr(attrs, node.Info)
-		r.cr(w)
-		r.out(w, preTag)
-		r.tag(w, codeTag[:len(codeTag)-1], attrs)
-		escapeHTML(w, node.Literal)
-		r.out(w, codeCloseTag)
-		r.out(w, preCloseTag)
-		if node.Parent.Type != Item {
-			r.cr(w)
+
+		// write out everything that came after it
+		if options.flags&HTML_OMIT_CONTENTS == 0 {
+			out.Write(temp.Bytes())
 		}
-	case Table:
-		if entering {
-			r.cr(w)
-			r.out(w, tableTag)
-		} else {
-			r.out(w, tableCloseTag)
-			r.cr(w)
+	}
+
+	if options.flags&HTML_COMPLETE_PAGE != 0 {
+		out.WriteString("\n</body>\n")
+		out.WriteString("</html>\n")
+	}
+
+}
+
+func (options *Html) TocHeaderWithAnchor(text []byte, level int, anchor string) {
+	for level > options.currentLevel {
+		switch {
+		case bytes.HasSuffix(options.toc.Bytes(), []byte("</li>\n")):
+			// this sublist can nest underneath a header
+			size := options.toc.Len()
+			options.toc.Truncate(size - len("</li>\n"))
+
+		case options.currentLevel > 0:
+			options.toc.WriteString("<li>")
 		}
-	case TableCell:
-		openTag := tdTag
-		closeTag := tdCloseTag
-		if node.IsHeader {
-			openTag = thTag
-			closeTag = thCloseTag
+		if options.toc.Len() > 0 {
+			options.toc.WriteByte('\n')
 		}
-		if entering {
-			align := cellAlignment(node.Align)
-			if align != "" {
-				attrs = append(attrs, fmt.Sprintf(`align="%s"`, align))
-			}
-			if node.Prev == nil {
-				r.cr(w)
-			}
-			r.tag(w, openTag, attrs)
-		} else {
-			r.out(w, closeTag)
-			r.cr(w)
+		options.toc.WriteString("<ul>\n")
+		options.currentLevel++
+	}
+
+	for level < options.currentLevel {
+		options.toc.WriteString("</ul>")
+		if options.currentLevel > 1 {
+			options.toc.WriteString("</li>\n")
 		}
-	case TableHead:
-		if entering {
-			r.cr(w)
-			r.out(w, theadTag)
-		} else {
-			r.out(w, theadCloseTag)
-			r.cr(w)
+		options.currentLevel--
+	}
+
+	options.toc.WriteString("<li><a href=\"#")
+	if anchor != "" {
+		options.toc.WriteString(anchor)
+	} else {
+		options.toc.WriteString("toc_")
+		options.toc.WriteString(strconv.Itoa(options.headerCount))
+	}
+	options.toc.WriteString("\">")
+	options.headerCount++
+
+	options.toc.Write(text)
+
+	options.toc.WriteString("</a></li>\n")
+}
+
+func (options *Html) TocHeader(text []byte, level int) {
+	options.TocHeaderWithAnchor(text, level, "")
+}
+
+func (options *Html) TocFinalize() {
+	for options.currentLevel > 1 {
+		options.toc.WriteString("</ul></li>\n")
+		options.currentLevel--
+	}
+
+	if options.currentLevel > 0 {
+		options.toc.WriteString("</ul>\n")
+	}
+}
+
+func isHtmlTag(tag []byte, tagname string) bool {
+	found, _ := findHtmlTagPos(tag, tagname)
+	return found
+}
+
+// Look for a character, but ignore it when it's in any kind of quotes, it
+// might be JavaScript
+func skipUntilCharIgnoreQuotes(html []byte, start int, char byte) int {
+	inSingleQuote := false
+	inDoubleQuote := false
+	inGraveQuote := false
+	i := start
+	for i < len(html) {
+		switch {
+		case html[i] == char && !inSingleQuote && !inDoubleQuote && !inGraveQuote:
+			return i
+		case html[i] == '\'':
+			inSingleQuote = !inSingleQuote
+		case html[i] == '"':
+			inDoubleQuote = !inDoubleQuote
+		case html[i] == '`':
+			inGraveQuote = !inGraveQuote
 		}
-	case TableBody:
-		if entering {
-			r.cr(w)
-			r.out(w, tbodyTag)
-			// XXX: this is to adhere to a rather silly test. Should fix test.
-			if node.FirstChild == nil {
-				r.cr(w)
-			}
-		} else {
-			r.out(w, tbodyCloseTag)
-			r.cr(w)
+		i++
+	}
+	return start
+}
+
+func findHtmlTagPos(tag []byte, tagname string) (bool, int) {
+	i := 0
+	if i < len(tag) && tag[0] != '<' {
+		return false, -1
+	}
+	i++
+	i = skipSpace(tag, i)
+
+	if i < len(tag) && tag[i] == '/' {
+		i++
+	}
+
+	i = skipSpace(tag, i)
+	j := 0
+	for ; i < len(tag); i, j = i+1, j+1 {
+		if j >= len(tagname) {
+			break
 		}
-	case TableRow:
-		if entering {
-			r.cr(w)
-			r.out(w, trTag)
-		} else {
-			r.out(w, trCloseTag)
-			r.cr(w)
+
+		if strings.ToLower(string(tag[i]))[0] != tagname[j] {
+			return false, -1
 		}
-	default:
-		panic("Unknown node type " + node.Type.String())
 	}
-	return GoToNext
+
+	if i == len(tag) {
+		return false, -1
+	}
+
+	rightAngle := skipUntilCharIgnoreQuotes(tag, i, '>')
+	if rightAngle > i {
+		return true, rightAngle
+	}
+
+	return false, -1
 }
 
-// RenderHeader writes HTML document preamble and TOC if requested.
-func (r *HTMLRenderer) RenderHeader(w io.Writer, ast *Node) {
-	r.writeDocumentHeader(w)
-	if r.Flags&TOC != 0 {
-		r.writeTOC(w, ast)
+func skipUntilChar(text []byte, start int, char byte) int {
+	i := start
+	for i < len(text) && text[i] != char {
+		i++
 	}
+	return i
 }
 
-// RenderFooter writes HTML document footer.
-func (r *HTMLRenderer) RenderFooter(w io.Writer, ast *Node) {
-	if r.Flags&CompletePage == 0 {
-		return
+func skipSpace(tag []byte, i int) int {
+	for i < len(tag) && isspace(tag[i]) {
+		i++
 	}
-	io.WriteString(w, "\n</body>\n</html>\n")
+	return i
 }
 
-func (r *HTMLRenderer) writeDocumentHeader(w io.Writer) {
-	if r.Flags&CompletePage == 0 {
-		return
+func skipChar(data []byte, start int, char byte) int {
+	i := start
+	for i < len(data) && data[i] == char {
+		i++
 	}
-	ending := ""
-	if r.Flags&UseXHTML != 0 {
-		io.WriteString(w, "<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Transitional//EN\" ")
-		io.WriteString(w, "\"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd\">\n")
-		io.WriteString(w, "<html xmlns=\"http://www.w3.org/1999/xhtml\">\n")
-		ending = " /"
-	} else {
-		io.WriteString(w, "<!DOCTYPE html>\n")
-		io.WriteString(w, "<html>\n")
+	return i
+}
+
+func doubleSpace(out *bytes.Buffer) {
+	if out.Len() > 0 {
+		out.WriteByte('\n')
 	}
-	io.WriteString(w, "<head>\n")
-	io.WriteString(w, "  <title>")
-	if r.Flags&Smartypants != 0 {
-		r.sr.Process(w, []byte(r.Title))
-	} else {
-		escapeHTML(w, []byte(r.Title))
-	}
-	io.WriteString(w, "</title>\n")
-	io.WriteString(w, "  <meta name=\"GENERATOR\" content=\"Blackfriday Markdown Processor v")
-	io.WriteString(w, Version)
-	io.WriteString(w, "\"")
-	io.WriteString(w, ending)
-	io.WriteString(w, ">\n")
-	io.WriteString(w, "  <meta charset=\"utf-8\"")
-	io.WriteString(w, ending)
-	io.WriteString(w, ">\n")
-	if r.CSS != "" {
-		io.WriteString(w, "  <link rel=\"stylesheet\" type=\"text/css\" href=\"")
-		escapeHTML(w, []byte(r.CSS))
-		io.WriteString(w, "\"")
-		io.WriteString(w, ending)
-		io.WriteString(w, ">\n")
-	}
-	if r.Icon != "" {
-		io.WriteString(w, "  <link rel=\"icon\" type=\"image/x-icon\" href=\"")
-		escapeHTML(w, []byte(r.Icon))
-		io.WriteString(w, "\"")
-		io.WriteString(w, ending)
-		io.WriteString(w, ">\n")
-	}
-	io.WriteString(w, "</head>\n")
-	io.WriteString(w, "<body>\n\n")
-}
-
-func (r *HTMLRenderer) writeTOC(w io.Writer, ast *Node) {
-	buf := bytes.Buffer{}
-
-	inHeading := false
-	tocLevel := 0
-	headingCount := 0
-
-	ast.Walk(func(node *Node, entering bool) WalkStatus {
-		if node.Type == Heading && !node.HeadingData.IsTitleblock {
-			inHeading = entering
-			if entering {
-				node.HeadingID = fmt.Sprintf("toc_%d", headingCount)
-				if node.Level == tocLevel {
-					buf.WriteString("</li>\n\n<li>")
-				} else if node.Level < tocLevel {
-					for node.Level < tocLevel {
-						tocLevel--
-						buf.WriteString("</li>\n</ul>")
-					}
-					buf.WriteString("</li>\n\n<li>")
-				} else {
-					for node.Level > tocLevel {
-						tocLevel++
-						buf.WriteString("\n<ul>\n<li>")
-					}
-				}
-
-				fmt.Fprintf(&buf, `<a href="#toc_%d">`, headingCount)
-				headingCount++
-			} else {
-				buf.WriteString("</a>")
-			}
-			return GoToNext
-		}
+}
 
-		if inHeading {
-			return r.RenderNode(&buf, node, entering)
-		}
+func isRelativeLink(link []byte) (yes bool) {
+	// a tag begin with '#'
+	if link[0] == '#' {
+		return true
+	}
 
-		return GoToNext
-	})
+	// link begin with '/' but not '//', the second maybe a protocol relative link
+	if len(link) >= 2 && link[0] == '/' && link[1] != '/' {
+		return true
+	}
 
-	for ; tocLevel > 0; tocLevel-- {
-		buf.WriteString("</li>\n</ul>")
+	// only the root '/'
+	if len(link) == 1 && link[0] == '/' {
+		return true
 	}
 
-	if buf.Len() > 0 {
-		io.WriteString(w, "<nav>\n")
-		w.Write(buf.Bytes())
-		io.WriteString(w, "\n\n</nav>\n")
+	// current directory : begin with "./"
+	if bytes.HasPrefix(link, []byte("./")) {
+		return true
 	}
-	r.lastOutputLen = buf.Len()
+
+	// parent directory : begin with "../"
+	if bytes.HasPrefix(link, []byte("../")) {
+		return true
+	}
+
+	return false
+}
+
+func (options *Html) ensureUniqueHeaderID(id string) string {
+	for count, found := options.headerIDs[id]; found; count, found = options.headerIDs[id] {
+		tmp := fmt.Sprintf("%s-%d", id, count+1)
+
+		if _, tmpFound := options.headerIDs[tmp]; !tmpFound {
+			options.headerIDs[id] = count + 1
+			id = tmp
+		} else {
+			id = id + "-1"
+		}
+	}
+
+	if _, found := options.headerIDs[id]; !found {
+		options.headerIDs[id] = 0
+	}
+
+	return id
 }
diff --git a/vendor/github.com/russross/blackfriday/inline.go b/vendor/github.com/russross/blackfriday/inline.go
index 3d633106..4483b8f1 100644
--- a/vendor/github.com/russross/blackfriday/inline.go
+++ b/vendor/github.com/russross/blackfriday/inline.go
@@ -22,9 +22,6 @@ import (
 var (
 	urlRe    = `((https?|ftp):\/\/|\/)[-A-Za-z0-9+&@#\/%?=~_|!:,.;\(\)]+`
 	anchorRe = regexp.MustCompile(`^(<a\shref="` + urlRe + `"(\stitle="[^"<>]+")?\s?>` + urlRe + `<\/a>)`)
-
-	// TODO: improve this regexp to catch all possible entities:
-	htmlEntityRe = regexp.MustCompile(`&[a-z]{2,5};`)
 )
 
 // Functions to parse text within a block
@@ -32,89 +29,87 @@ var (
 // data is the complete block being rendered
 // offset is the number of valid chars before the current cursor
 
-func (p *Markdown) inline(currBlock *Node, data []byte) {
-	// handlers might call us recursively: enforce a maximum depth
-	if p.nesting >= p.maxNesting || len(data) == 0 {
+func (p *parser) inline(out *bytes.Buffer, data []byte) {
+	// this is called recursively: enforce a maximum depth
+	if p.nesting >= p.maxNesting {
 		return
 	}
 	p.nesting++
-	beg, end := 0, 0
-	for end < len(data) {
-		handler := p.inlineCallback[data[end]]
-		if handler != nil {
-			if consumed, node := handler(p, data, end); consumed == 0 {
-				// No action from the callback.
-				end++
-			} else {
-				// Copy inactive chars into the output.
-				currBlock.AppendChild(text(data[beg:end]))
-				if node != nil {
-					currBlock.AppendChild(node)
-				}
-				// Skip past whatever the callback used.
-				beg = end + consumed
-				end = beg
-			}
-		} else {
+
+	i, end := 0, 0
+	for i < len(data) {
+		// copy inactive chars into the output
+		for end < len(data) && p.inlineCallback[data[end]] == nil {
 			end++
 		}
-	}
-	if beg < len(data) {
-		if data[end-1] == '\n' {
-			end--
+
+		p.r.NormalText(out, data[i:end])
+
+		if end >= len(data) {
+			break
+		}
+		i = end
+
+		// call the trigger
+		handler := p.inlineCallback[data[end]]
+		if consumed := handler(p, out, data, i); consumed == 0 {
+			// no action from the callback; buffer the byte for later
+			end = i + 1
+		} else {
+			// skip past whatever the callback used
+			i += consumed
+			end = i
 		}
-		currBlock.AppendChild(text(data[beg:end]))
 	}
+
 	p.nesting--
 }
 
 // single and double emphasis parsing
-func emphasis(p *Markdown, data []byte, offset int) (int, *Node) {
+func emphasis(p *parser, out *bytes.Buffer, data []byte, offset int) int {
 	data = data[offset:]
 	c := data[0]
+	ret := 0
 
 	if len(data) > 2 && data[1] != c {
 		// whitespace cannot follow an opening emphasis;
 		// strikethrough only takes two characters '~~'
 		if c == '~' || isspace(data[1]) {
-			return 0, nil
+			return 0
 		}
-		ret, node := helperEmphasis(p, data[1:], c)
-		if ret == 0 {
-			return 0, nil
+		if ret = helperEmphasis(p, out, data[1:], c); ret == 0 {
+			return 0
 		}
 
-		return ret + 1, node
+		return ret + 1
 	}
 
 	if len(data) > 3 && data[1] == c && data[2] != c {
 		if isspace(data[2]) {
-			return 0, nil
+			return 0
 		}
-		ret, node := helperDoubleEmphasis(p, data[2:], c)
-		if ret == 0 {
-			return 0, nil
+		if ret = helperDoubleEmphasis(p, out, data[2:], c); ret == 0 {
+			return 0
 		}
 
-		return ret + 2, node
+		return ret + 2
 	}
 
 	if len(data) > 4 && data[1] == c && data[2] == c && data[3] != c {
 		if c == '~' || isspace(data[3]) {
-			return 0, nil
+			return 0
 		}
-		ret, node := helperTripleEmphasis(p, data, 3, c)
-		if ret == 0 {
-			return 0, nil
+		if ret = helperTripleEmphasis(p, out, data, 3, c); ret == 0 {
+			return 0
 		}
 
-		return ret + 3, node
+		return ret + 3
 	}
 
-	return 0, nil
+	return 0
 }
 
-func codeSpan(p *Markdown, data []byte, offset int) (int, *Node) {
+func codeSpan(p *parser, out *bytes.Buffer, data []byte, offset int) int {
 	data = data[offset:]
 
 	nb := 0
@@ -136,7 +131,7 @@ func codeSpan(p *Markdown, data []byte, offset int) (int, *Node) {
 
 	// no matching delimiter?
 	if i < nb && end >= len(data) {
-		return 0, nil
+		return 0
 	}
 
 	// trim outside whitespace
@@ -152,36 +147,43 @@ func codeSpan(p *Markdown, data []byte, offset int) (int, *Node) {
 
 	// render the code span
 	if fBegin != fEnd {
-		code := NewNode(Code)
-		code.Literal = data[fBegin:fEnd]
-		return end, code
+		p.r.CodeSpan(out, data[fBegin:fEnd])
 	}
 
-	return end, nil
+	return end
+
 }
 
 // newline preceded by two spaces becomes <br>
-func maybeLineBreak(p *Markdown, data []byte, offset int) (int, *Node) {
-	origOffset := offset
-	for offset < len(data) && data[offset] == ' ' {
-		offset++
+// newline without two spaces works when EXTENSION_HARD_LINE_BREAK is enabled
+func lineBreak(p *parser, out *bytes.Buffer, data []byte, offset int) int {
+	// remove trailing spaces from out
+	outBytes := out.Bytes()
+	end := len(outBytes)
+	eol := end
+	for eol > 0 && outBytes[eol-1] == ' ' {
+		eol--
 	}
+	out.Truncate(eol)
 
-	if offset < len(data) && data[offset] == '\n' {
-		if offset-origOffset >= 2 {
-			return offset - origOffset + 1, NewNode(Hardbreak)
-		}
-		return offset - origOffset, nil
+	precededByTwoSpaces := offset >= 2 && data[offset-2] == ' ' && data[offset-1] == ' '
+	precededByBackslash := offset >= 1 && data[offset-1] == '\\' // see http://spec.commonmark.org/0.18/#example-527
+	precededByBackslash = precededByBackslash && p.flags&EXTENSION_BACKSLASH_LINE_BREAK != 0
+
+	if p.flags&EXTENSION_JOIN_LINES != 0 {
+		return 1
 	}
-	return 0, nil
-}
 
-// newline without two spaces works when HardLineBreak is enabled
-func lineBreak(p *Markdown, data []byte, offset int) (int, *Node) {
-	if p.extensions&HardLineBreak != 0 {
-		return 1, NewNode(Hardbreak)
+	// should there be a hard line break here?
+	if p.flags&EXTENSION_HARD_LINE_BREAK == 0 && !precededByTwoSpaces && !precededByBackslash {
+		return 0
+	}
+
+	if precededByBackslash && eol > 0 {
+		out.Truncate(eol - 1)
 	}
-	return 0, nil
+	p.r.LineBreak(out)
+	return 1
 }
 
 type linkType int
@@ -200,43 +202,27 @@ func isReferenceStyleLink(data []byte, pos int, t linkType) bool {
 	return pos < len(data)-1 && data[pos] == '[' && data[pos+1] != '^'
 }
 
-func maybeImage(p *Markdown, data []byte, offset int) (int, *Node) {
-	if offset < len(data)-1 && data[offset+1] == '[' {
-		return link(p, data, offset)
-	}
-	return 0, nil
-}
-
-func maybeInlineFootnote(p *Markdown, data []byte, offset int) (int, *Node) {
-	if offset < len(data)-1 && data[offset+1] == '[' {
-		return link(p, data, offset)
-	}
-	return 0, nil
-}
-
 // '[': parse a link or an image or a footnote
-func link(p *Markdown, data []byte, offset int) (int, *Node) {
+func link(p *parser, out *bytes.Buffer, data []byte, offset int) int {
 	// no links allowed inside regular links, footnote, and deferred footnotes
 	if p.insideLink && (offset > 0 && data[offset-1] == '[' || len(data)-1 > offset && data[offset+1] == '^') {
-		return 0, nil
+		return 0
 	}
 
 	var t linkType
 	switch {
 	// special case: ![^text] == deferred footnote (that follows something with
 	// an exclamation point)
-	case p.extensions&Footnotes != 0 && len(data)-1 > offset && data[offset+1] == '^':
+	case p.flags&EXTENSION_FOOTNOTES != 0 && len(data)-1 > offset && data[offset+1] == '^':
 		t = linkDeferredFootnote
 	// ![alt] == image
-	case offset >= 0 && data[offset] == '!':
+	case offset > 0 && data[offset-1] == '!':
 		t = linkImg
-		offset++
 	// ^[text] == inline footnote
 	// [^refId] == deferred footnote
-	case p.extensions&Footnotes != 0:
-		if offset >= 0 && data[offset] == '^' {
+	case p.flags&EXTENSION_FOOTNOTES != 0:
+		if offset > 0 && data[offset-1] == '^' {
 			t = linkInlineFootnote
-			offset++
 		} else if len(data)-1 > offset && data[offset+1] == '^' {
 			t = linkDeferredFootnote
 		}
@@ -249,7 +235,7 @@ func link(p *Markdown, data []byte, offset int) (int, *Node) {
 
 	var (
 		i                       = 1
-		noteID                  int
+		noteId                  int
 		title, link, altContent []byte
 		textHasNl               = false
 	)
@@ -258,6 +244,8 @@ func link(p *Markdown, data []byte, offset int) (int, *Node) {
 		i++
 	}
 
+	brace := 0
+
 	// look for the matching closing bracket
 	for level := 1; level > 0 && i < len(data); i++ {
 		switch {
@@ -279,12 +267,11 @@ func link(p *Markdown, data []byte, offset int) (int, *Node) {
 	}
 
 	if i >= len(data) {
-		return 0, nil
+		return 0
 	}
 
 	txtE := i
 	i++
-	var footnoteNode *Node
 
 	// skip any amount of whitespace or newline
 	// (this is much more lax than original markdown syntax)
@@ -292,8 +279,8 @@ func link(p *Markdown, data []byte, offset int) (int, *Node) {
 		i++
 	}
 
-	// inline style link
 	switch {
+	// inline style link
 	case i < len(data) && data[i] == '(':
 		// skip initial whitespace
 		i++
@@ -304,14 +291,27 @@ func link(p *Markdown, data []byte, offset int) (int, *Node) {
 
 		linkB := i
 
-		// look for link end: ' " )
+		// look for link end: ' " ), check for new opening braces and take this
+		// into account, this may lead for overshooting and probably will require
+		// some fine-tuning.
 	findlinkend:
 		for i < len(data) {
 			switch {
 			case data[i] == '\\':
 				i += 2
 
-			case data[i] == ')' || data[i] == '\'' || data[i] == '"':
+			case data[i] == '(':
+				brace++
+				i++
+
+			case data[i] == ')':
+				if brace <= 0 {
+					break findlinkend
+				}
+				brace--
+				i++
+
+			case data[i] == '\'' || data[i] == '"':
 				break findlinkend
 
 			default:
@@ -320,7 +320,7 @@ func link(p *Markdown, data []byte, offset int) (int, *Node) {
 		}
 
 		if i >= len(data) {
-			return 0, nil
+			return 0
 		}
 		linkE := i
 
@@ -345,7 +345,7 @@ func link(p *Markdown, data []byte, offset int) (int, *Node) {
 			}
 
 			if i >= len(data) {
-				return 0, nil
+				return 0
 			}
 
 			// skip whitespace after title
@@ -397,7 +397,7 @@ func link(p *Markdown, data []byte, offset int) (int, *Node) {
 			i++
 		}
 		if i >= len(data) {
-			return 0, nil
+			return 0
 		}
 		linkE := i
 
@@ -427,7 +427,7 @@ func link(p *Markdown, data []byte, offset int) (int, *Node) {
 		// find the reference with matching id
 		lr, ok := p.getRef(string(id))
 		if !ok {
-			return 0, nil
+			return 0
 		}
 
 		// keep link and title from reference
@@ -464,10 +464,9 @@ func link(p *Markdown, data []byte, offset int) (int, *Node) {
 			}
 		}
 
-		footnoteNode = NewNode(Item)
 		if t == linkInlineFootnote {
 			// create a new reference
-			noteID = len(p.notes) + 1
+			noteId = len(p.notes) + 1
 
 			var fragment []byte
 			if len(id) > 0 {
@@ -478,18 +477,18 @@ func link(p *Markdown, data []byte, offset int) (int, *Node) {
 				}
 				copy(fragment, slugify(id))
 			} else {
-				fragment = append([]byte("footnote-"), []byte(strconv.Itoa(noteID))...)
+				fragment = append([]byte("footnote-"), []byte(strconv.Itoa(noteId))...)
 			}
 
 			ref := &reference{
-				noteID:   noteID,
+				noteId:   noteId,
 				hasBlock: false,
 				link:     fragment,
 				title:    id,
-				footnote: footnoteNode,
 			}
 
 			p.notes = append(p.notes, ref)
+			p.notesRecord[string(ref.link)] = struct{}{}
 
 			link = ref.link
 			title = ref.title
@@ -497,26 +496,40 @@ func link(p *Markdown, data []byte, offset int) (int, *Node) {
 			// find the reference with matching id
 			lr, ok := p.getRef(string(id))
 			if !ok {
-				return 0, nil
+				return 0
 			}
 
-			if t == linkDeferredFootnote {
-				lr.noteID = len(p.notes) + 1
-				lr.footnote = footnoteNode
+			if t == linkDeferredFootnote && !p.isFootnote(lr) {
+				lr.noteId = len(p.notes) + 1
 				p.notes = append(p.notes, lr)
+				p.notesRecord[string(lr.link)] = struct{}{}
 			}
 
 			// keep link and title from reference
 			link = lr.link
 			// if inline footnote, title == footnote contents
 			title = lr.title
-			noteID = lr.noteID
+			noteId = lr.noteId
 		}
 
 		// rewind the whitespace
 		i = txtE + 1
 	}
 
+	// build content: img alt is escaped, link content is parsed
+	var content bytes.Buffer
+	if txtE > 1 {
+		if t == linkImg {
+			content.Write(data[1:txtE])
+		} else {
+			// links cannot contain other links, so turn off link parsing temporarily
+			insideLink := p.insideLink
+			p.insideLink = true
+			p.inline(&content, data[1:txtE])
+			p.insideLink = insideLink
+		}
+	}
+
 	var uLink []byte
 	if t == linkNormal || t == linkImg {
 		if len(link) > 0 {
@@ -526,54 +539,49 @@ func link(p *Markdown, data []byte, offset int) (int, *Node) {
 		}
 
 		// links need something to click on and somewhere to go
-		if len(uLink) == 0 || (t == linkNormal && txtE <= 1) {
-			return 0, nil
+		if len(uLink) == 0 || (t == linkNormal && content.Len() == 0) {
+			return 0
 		}
 	}
 
 	// call the relevant rendering function
-	var linkNode *Node
 	switch t {
 	case linkNormal:
-		linkNode = NewNode(Link)
-		linkNode.Destination = normalizeURI(uLink)
-		linkNode.Title = title
 		if len(altContent) > 0 {
-			linkNode.AppendChild(text(altContent))
+			p.r.Link(out, uLink, title, altContent)
 		} else {
-			// links cannot contain other links, so turn off link parsing
-			// temporarily and recurse
-			insideLink := p.insideLink
-			p.insideLink = true
-			p.inline(linkNode, data[1:txtE])
-			p.insideLink = insideLink
+			p.r.Link(out, uLink, title, content.Bytes())
 		}
 
 	case linkImg:
-		linkNode = NewNode(Image)
-		linkNode.Destination = uLink
-		linkNode.Title = title
-		linkNode.AppendChild(text(data[1:txtE]))
-		i++
+		outSize := out.Len()
+		outBytes := out.Bytes()
+		if outSize > 0 && outBytes[outSize-1] == '!' {
+			out.Truncate(outSize - 1)
+		}
 
-	case linkInlineFootnote, linkDeferredFootnote:
-		linkNode = NewNode(Link)
-		linkNode.Destination = link
-		linkNode.Title = title
-		linkNode.NoteID = noteID
-		linkNode.Footnote = footnoteNode
-		if t == linkInlineFootnote {
-			i++
+		p.r.Image(out, uLink, title, content.Bytes())
+
+	case linkInlineFootnote:
+		outSize := out.Len()
+		outBytes := out.Bytes()
+		if outSize > 0 && outBytes[outSize-1] == '^' {
+			out.Truncate(outSize - 1)
 		}
 
+		p.r.FootnoteRef(out, link, noteId)
+
+	case linkDeferredFootnote:
+		p.r.FootnoteRef(out, link, noteId)
+
 	default:
-		return 0, nil
+		return 0
 	}
 
-	return i, linkNode
+	return i
 }
 
-func (p *Markdown) inlineHTMLComment(data []byte) int {
+func (p *parser) inlineHTMLComment(out *bytes.Buffer, data []byte) int {
 	if len(data) < 5 {
 		return 0
 	}
@@ -592,75 +600,44 @@ func (p *Markdown) inlineHTMLComment(data []byte) int {
 	return i + 1
 }
 
-func stripMailto(link []byte) []byte {
-	if bytes.HasPrefix(link, []byte("mailto://")) {
-		return link[9:]
-	} else if bytes.HasPrefix(link, []byte("mailto:")) {
-		return link[7:]
-	} else {
-		return link
-	}
-}
-
-// autolinkType specifies a kind of autolink that gets detected.
-type autolinkType int
-
-// These are the possible flag values for the autolink renderer.
-const (
-	notAutolink autolinkType = iota
-	normalAutolink
-	emailAutolink
-)
-
 // '<' when tags or autolinks are allowed
-func leftAngle(p *Markdown, data []byte, offset int) (int, *Node) {
+func leftAngle(p *parser, out *bytes.Buffer, data []byte, offset int) int {
 	data = data[offset:]
-	altype, end := tagLength(data)
-	if size := p.inlineHTMLComment(data); size > 0 {
+	altype := LINK_TYPE_NOT_AUTOLINK
+	end := tagLength(data, &altype)
+	if size := p.inlineHTMLComment(out, data); size > 0 {
 		end = size
 	}
 	if end > 2 {
-		if altype != notAutolink {
+		if altype != LINK_TYPE_NOT_AUTOLINK {
 			var uLink bytes.Buffer
 			unescapeText(&uLink, data[1:end+1-2])
 			if uLink.Len() > 0 {
-				link := uLink.Bytes()
-				node := NewNode(Link)
-				node.Destination = link
-				if altype == emailAutolink {
-					node.Destination = append([]byte("mailto:"), link...)
-				}
-				node.AppendChild(text(stripMailto(link)))
-				return end, node
+				p.r.AutoLink(out, uLink.Bytes(), altype)
 			}
 		} else {
-			htmlTag := NewNode(HTMLSpan)
-			htmlTag.Literal = data[:end]
-			return end, htmlTag
+			p.r.RawHtmlTag(out, data[:end])
 		}
 	}
 
-	return end, nil
+	return end
 }
 
 // '\\' backslash escape
 var escapeChars = []byte("\\`*_{}[]()#+-.!:|&<>~")
 
-func escape(p *Markdown, data []byte, offset int) (int, *Node) {
+func escape(p *parser, out *bytes.Buffer, data []byte, offset int) int {
 	data = data[offset:]
 
 	if len(data) > 1 {
-		if p.extensions&BackslashLineBreak != 0 && data[1] == '\n' {
-			return 2, NewNode(Hardbreak)
-		}
 		if bytes.IndexByte(escapeChars, data[1]) < 0 {
-			return 0, nil
+			return 0
 		}
 
-		return 2, text(data[1:2])
+		p.r.NormalText(out, data[1:2])
 	}
 
-	return 2, nil
+	return 2
 }
 
 func unescapeText(ob *bytes.Buffer, src []byte) {
@@ -686,7 +663,7 @@ func unescapeText(ob *bytes.Buffer, src []byte) {
 
 // '&' escaped when it doesn't belong to an entity
 // valid entities are assumed to be anything matching &#?[A-Za-z0-9]+;
-func entity(p *Markdown, data []byte, offset int) (int, *Node) {
+func entity(p *parser, out *bytes.Buffer, data []byte, offset int) int {
 	data = data[offset:]
 
 	end := 1
@@ -702,70 +679,25 @@ func entity(p *Markdown, data []byte, offset int) (int, *Node) {
 	if end < len(data) && data[end] == ';' {
 		end++ // real entity
 	} else {
-		return 0, nil // lone '&'
+		return 0 // lone '&'
 	}
 
-	ent := data[:end]
-	// undo &amp; escaping or it will be converted to &amp;amp; by another
-	// escaper in the renderer
-	if bytes.Equal(ent, []byte("&amp;")) {
-		ent = []byte{'&'}
-	}
+	p.r.Entity(out, data[:end])
 
-	return end, text(ent)
+	return end
 }
 
 func linkEndsWithEntity(data []byte, linkEnd int) bool {
-	entityRanges := htmlEntityRe.FindAllIndex(data[:linkEnd], -1)
+	entityRanges := htmlEntity.FindAllIndex(data[:linkEnd], -1)
 	return entityRanges != nil && entityRanges[len(entityRanges)-1][1] == linkEnd
 }
 
-// hasPrefixCaseInsensitive is a custom implementation of
-//     strings.HasPrefix(strings.ToLower(s), prefix)
-// we rolled our own because ToLower pulls in a huge machinery of lowercasing
-// anything from Unicode and that's very slow. Since this func will only be
-// used on ASCII protocol prefixes, we can take shortcuts.
-func hasPrefixCaseInsensitive(s, prefix []byte) bool {
-	if len(s) < len(prefix) {
-		return false
-	}
-	delta := byte('a' - 'A')
-	for i, b := range prefix {
-		if b != s[i] && b != s[i]+delta {
-			return false
-		}
-	}
-	return true
-}
-
-var protocolPrefixes = [][]byte{
-	[]byte("http://"),
-	[]byte("https://"),
-	[]byte("ftp://"),
-	[]byte("file://"),
-	[]byte("mailto:"),
-}
-
-const shortestPrefix = 6 // len("ftp://"), the shortest of the above
-
-func maybeAutoLink(p *Markdown, data []byte, offset int) (int, *Node) {
-	// quick check to rule out most false hits
-	if p.insideLink || len(data) < offset+shortestPrefix {
-		return 0, nil
-	}
-	for _, prefix := range protocolPrefixes {
-		endOfHead := offset + 8 // 8 is the len() of the longest prefix
-		if endOfHead > len(data) {
-			endOfHead = len(data)
-		}
-		if hasPrefixCaseInsensitive(data[offset:endOfHead], prefix) {
-			return autoLink(p, data, offset)
-		}
+func autoLink(p *parser, out *bytes.Buffer, data []byte, offset int) int {
+	// quick check to rule out most false hits on ':'
+	if p.insideLink || len(data) < offset+3 || data[offset+1] != '/' || data[offset+2] != '/' {
+		return 0
 	}
-	return 0, nil
-}
 
-func autoLink(p *Markdown, data []byte, offset int) (int, *Node) {
 	// Now a more expensive check to see if we're not inside an anchor element
 	anchorStart := offset
 	offsetFromAnchor := 0
@@ -776,9 +708,8 @@ func autoLink(p *Markdown, data []byte, offset int) (int, *Node) {
 
 	anchorStr := anchorRe.Find(data[anchorStart:])
 	if anchorStr != nil {
-		anchorClose := NewNode(HTMLSpan)
-		anchorClose.Literal = anchorStr[offsetFromAnchor:]
-		return len(anchorStr) - offsetFromAnchor, anchorClose
+		out.Write(anchorStr[offsetFromAnchor:])
+		return len(anchorStr) - offsetFromAnchor
 	}
 
 	// scan backward for a word boundary
@@ -787,14 +718,14 @@ func autoLink(p *Markdown, data []byte, offset int) (int, *Node) {
 		rewind++
 	}
 	if rewind > 6 { // longest supported protocol is "mailto" which has 6 letters
-		return 0, nil
+		return 0
 	}
 
 	origData := data
 	data = data[offset-rewind:]
 
 	if !isSafeLink(data) {
-		return 0, nil
+		return 0
 	}
 
 	linkEnd := 0
@@ -871,17 +802,19 @@ func autoLink(p *Markdown, data []byte, offset int) (int, *Node) {
 		}
 	}
 
+	// we were triggered on the ':', so we need to rewind the output a bit
+	if out.Len() >= rewind {
+		out.Truncate(len(out.Bytes()) - rewind)
+	}
+
 	var uLink bytes.Buffer
 	unescapeText(&uLink, data[:linkEnd])
 
 	if uLink.Len() > 0 {
-		node := NewNode(Link)
-		node.Destination = uLink.Bytes()
-		node.AppendChild(text(uLink.Bytes()))
-		return linkEnd, node
+		p.r.AutoLink(out, uLink.Bytes(), LINK_TYPE_NORMAL)
 	}
 
-	return linkEnd, nil
+	return linkEnd - rewind
 }
 
 func isEndOfLink(char byte) bool {
@@ -914,17 +847,17 @@ func isSafeLink(link []byte) bool {
 }
 
 // return the length of the given tag, or 0 is it's not valid
-func tagLength(data []byte) (autolink autolinkType, end int) {
+func tagLength(data []byte, autolink *int) int {
 	var i, j int
 
 	// a valid tag can't be shorter than 3 chars
 	if len(data) < 3 {
-		return notAutolink, 0
+		return 0
 	}
 
 	// begins with a '<' optionally followed by '/', followed by letter or number
 	if data[0] != '<' {
-		return notAutolink, 0
+		return 0
 	}
 	if data[1] == '/' {
 		i = 2
@@ -933,11 +866,11 @@ func tagLength(data []byte) (autolink autolinkType, end int) {
 	}
 
 	if !isalnum(data[i]) {
-		return notAutolink, 0
+		return 0
 	}
 
 	// scheme test
-	autolink = notAutolink
+	*autolink = LINK_TYPE_NOT_AUTOLINK
 
 	// try to find the beginning of an URI
 	for i < len(data) && (isalnum(data[i]) || data[i] == '.' || data[i] == '+' || data[i] == '-') {
@@ -946,20 +879,21 @@ func tagLength(data []byte) (autolink autolinkType, end int) {
 
 	if i > 1 && i < len(data) && data[i] == '@' {
 		if j = isMailtoAutoLink(data[i:]); j != 0 {
-			return emailAutolink, i + j
+			*autolink = LINK_TYPE_EMAIL
+			return i + j
 		}
 	}
 
 	if i > 2 && i < len(data) && data[i] == ':' {
-		autolink = normalAutolink
+		*autolink = LINK_TYPE_NORMAL
 		i++
 	}
 
 	// complete autolink test: no whitespace or ' or "
 	switch {
 	case i >= len(data):
-		autolink = notAutolink
-	case autolink != notAutolink:
+		*autolink = LINK_TYPE_NOT_AUTOLINK
+	case *autolink != 0:
 		j = i
 
 		for i < len(data) {
@@ -974,20 +908,24 @@ func tagLength(data []byte) (autolink autolinkType, end int) {
 		}
 
 		if i >= len(data) {
-			return autolink, 0
+			return 0
 		}
 		if i > j && data[i] == '>' {
-			return autolink, i + 1
+			return i + 1
 		}
 
 		// one of the forbidden chars has been found
-		autolink = notAutolink
+		*autolink = LINK_TYPE_NOT_AUTOLINK
 	}
-	i += bytes.IndexByte(data[i:], '>')
-	if i < 0 {
-		return autolink, 0
+
+	// look for something looking like a tag end
+	for i < len(data) && data[i] != '>' {
+		i++
+	}
+	if i >= len(data) {
+		return 0
 	}
-	return autolink, i + 1
+	return i + 1
 }
 
 // look for the address part of a mail autolink and '>'
@@ -1006,13 +944,14 @@ func isMailtoAutoLink(data []byte) int {
 			nb++
 
 		case '-', '.', '_':
-			break
+			// Do nothing.
 
 		case '>':
 			if nb == 1 {
 				return i + 1
+			} else {
+				return 0
 			}
-			return 0
 		default:
 			return 0
 		}
@@ -1075,8 +1014,9 @@ func helperFindEmphChar(data []byte, c byte) int {
 			if data[i] != '[' && data[i] != '(' { // not a link
 				if tmpI > 0 {
 					return tmpI
+				} else {
+					continue
 				}
-				continue
 			}
 			cc := data[i]
 			i++
@@ -1095,7 +1035,7 @@ func helperFindEmphChar(data []byte, c byte) int {
 	return 0
 }
 
-func helperEmphasis(p *Markdown, data []byte, c byte) (int, *Node) {
+func helperEmphasis(p *parser, out *bytes.Buffer, data []byte, c byte) int {
 	i := 0
 
 	// skip one symbol if coming from emph3
@@ -1106,11 +1046,11 @@ func helperEmphasis(p *Markdown, data []byte, c byte) (int, *Node) {
 	for i < len(data) {
 		length := helperFindEmphChar(data[i:], c)
 		if length == 0 {
-			return 0, nil
+			return 0
 		}
 		i += length
 		if i >= len(data) {
-			return 0, nil
+			return 0
 		}
 
 		if i+1 < len(data) && data[i+1] == c {
@@ -1120,46 +1060,52 @@ func helperEmphasis(p *Markdown, data []byte, c byte) (int, *Node) {
 
 		if data[i] == c && !isspace(data[i-1]) {
 
-			if p.extensions&NoIntraEmphasis != 0 {
+			if p.flags&EXTENSION_NO_INTRA_EMPHASIS != 0 {
 				if !(i+1 == len(data) || isspace(data[i+1]) || ispunct(data[i+1])) {
 					continue
 				}
 			}
 
-			emph := NewNode(Emph)
-			p.inline(emph, data[:i])
-			return i + 1, emph
+			var work bytes.Buffer
+			p.inline(&work, data[:i])
+			p.r.Emphasis(out, work.Bytes())
+			return i + 1
 		}
 	}
 
-	return 0, nil
+	return 0
 }
 
-func helperDoubleEmphasis(p *Markdown, data []byte, c byte) (int, *Node) {
+func helperDoubleEmphasis(p *parser, out *bytes.Buffer, data []byte, c byte) int {
 	i := 0
 
 	for i < len(data) {
 		length := helperFindEmphChar(data[i:], c)
 		if length == 0 {
-			return 0, nil
+			return 0
 		}
 		i += length
 
 		if i+1 < len(data) && data[i] == c && data[i+1] == c && i > 0 && !isspace(data[i-1]) {
-			nodeType := Strong
-			if c == '~' {
-				nodeType = Del
+			var work bytes.Buffer
+			p.inline(&work, data[:i])
+
+			if work.Len() > 0 {
+				// pick the right renderer
+				if c == '~' {
+					p.r.StrikeThrough(out, work.Bytes())
+				} else {
+					p.r.DoubleEmphasis(out, work.Bytes())
+				}
 			}
-			node := NewNode(nodeType)
-			p.inline(node, data[:i])
-			return i + 2, node
+			return i + 2
 		}
 		i++
 	}
-	return 0, nil
+	return 0
 }
 
-func helperTripleEmphasis(p *Markdown, data []byte, offset int, c byte) (int, *Node) {
+func helperTripleEmphasis(p *parser, out *bytes.Buffer, data []byte, offset int, c byte) int {
 	i := 0
 	origData := data
 	data = data[offset:]
@@ -1167,7 +1113,7 @@ func helperTripleEmphasis(p *Markdown, data []byte, offset int, c byte) (int, *N
 	for i < len(data) {
 		length := helperFindEmphChar(data[i:], c)
 		if length == 0 {
-			return 0, nil
+			return 0
 		}
 		i += length
 
@@ -1179,36 +1125,30 @@ func helperTripleEmphasis(p *Markdown, data []byte, offset int, c byte) (int, *N
 		switch {
 		case i+2 < len(data) && data[i+1] == c && data[i+2] == c:
 			// triple symbol found
-			strong := NewNode(Strong)
-			em := NewNode(Emph)
-			strong.AppendChild(em)
-			p.inline(em, data[:i])
-			return i + 3, strong
+			var work bytes.Buffer
+
+			p.inline(&work, data[:i])
+			if work.Len() > 0 {
+				p.r.TripleEmphasis(out, work.Bytes())
+			}
+			return i + 3
 		case (i+1 < len(data) && data[i+1] == c):
 			// double symbol found, hand over to emph1
-			length, node := helperEmphasis(p, origData[offset-2:], c)
+			length = helperEmphasis(p, out, origData[offset-2:], c)
 			if length == 0 {
-				return 0, nil
+				return 0
+			} else {
+				return length - 2
 			}
-			return length - 2, node
 		default:
 			// single symbol found, hand over to emph2
-			length, node := helperDoubleEmphasis(p, origData[offset-1:], c)
+			length = helperDoubleEmphasis(p, out, origData[offset-1:], c)
 			if length == 0 {
-				return 0, nil
+				return 0
+			} else {
+				return length - 1
 			}
-			return length - 1, node
 		}
 	}
-	return 0, nil
-}
-
-func text(s []byte) *Node {
-	node := NewNode(Text)
-	node.Literal = s
-	return node
-}
-
-func normalizeURI(s []byte) []byte {
-	return s // TODO: implement
+	return 0
 }
diff --git a/vendor/github.com/russross/blackfriday/latex.go b/vendor/github.com/russross/blackfriday/latex.go
new file mode 100644
index 00000000..3d30d094
--- /dev/null
+++ b/vendor/github.com/russross/blackfriday/latex.go
@@ -0,0 +1,334 @@
+//
+// Blackfriday Markdown Processor
+// Available at http://github.com/russross/blackfriday
+//
+// Copyright © 2011 Russ Ross <russ@russross.com>.
+// Distributed under the Simplified BSD License.
+// See README.md for details.
+//
+
+//
+//
+// LaTeX rendering backend
+//
+//
+
+package blackfriday
+
+import (
+	"bytes"
+	"strings"
+)
+
+// Latex is a type that implements the Renderer interface for LaTeX output.
+//
+// Do not create this directly, instead use the LatexRenderer function.
+type Latex struct {
+}
+
+// LatexRenderer creates and configures a Latex object, which
+// satisfies the Renderer interface.
+//
+// flags is a set of LATEX_* options ORed together (currently no such options
+// are defined).
+func LatexRenderer(flags int) Renderer {
+	return &Latex{}
+}
+
+func (options *Latex) GetFlags() int {
+	return 0
+}
+
+// render code chunks using verbatim, or listings if we have a language
+func (options *Latex) BlockCode(out *bytes.Buffer, text []byte, info string) {
+	if info == "" {
+		out.WriteString("\n\\begin{verbatim}\n")
+	} else {
+		lang := strings.Fields(info)[0]
+		out.WriteString("\n\\begin{lstlisting}[language=")
+		out.WriteString(lang)
+		out.WriteString("]\n")
+	}
+	out.Write(text)
+	if info == "" {
+		out.WriteString("\n\\end{verbatim}\n")
+	} else {
+		out.WriteString("\n\\end{lstlisting}\n")
+	}
+}
+
+func (options *Latex) TitleBlock(out *bytes.Buffer, text []byte) {
+
+}
+
+func (options *Latex) BlockQuote(out *bytes.Buffer, text []byte) {
+	out.WriteString("\n\\begin{quotation}\n")
+	out.Write(text)
+	out.WriteString("\n\\end{quotation}\n")
+}
+
+func (options *Latex) BlockHtml(out *bytes.Buffer, text []byte) {
+	// a pretty lame thing to do...
+	out.WriteString("\n\\begin{verbatim}\n")
+	out.Write(text)
+	out.WriteString("\n\\end{verbatim}\n")
+}
+
+func (options *Latex) Header(out *bytes.Buffer, text func() bool, level int, id string) {
+	marker := out.Len()
+
+	switch level {
+	case 1:
+		out.WriteString("\n\\section{")
+	case 2:
+		out.WriteString("\n\\subsection{")
+	case 3:
+		out.WriteString("\n\\subsubsection{")
+	case 4:
+		out.WriteString("\n\\paragraph{")
+	case 5:
+		out.WriteString("\n\\subparagraph{")
+	case 6:
+		out.WriteString("\n\\textbf{")
+	}
+	if !text() {
+		out.Truncate(marker)
+		return
+	}
+	out.WriteString("}\n")
+}
+
+func (options *Latex) HRule(out *bytes.Buffer) {
+	out.WriteString("\n\\HRule\n")
+}
+
+func (options *Latex) List(out *bytes.Buffer, text func() bool, flags int) {
+	marker := out.Len()
+	if flags&LIST_TYPE_ORDERED != 0 {
+		out.WriteString("\n\\begin{enumerate}\n")
+	} else {
+		out.WriteString("\n\\begin{itemize}\n")
+	}
+	if !text() {
+		out.Truncate(marker)
+		return
+	}
+	if flags&LIST_TYPE_ORDERED != 0 {
+		out.WriteString("\n\\end{enumerate}\n")
+	} else {
+		out.WriteString("\n\\end{itemize}\n")
+	}
+}
+
+func (options *Latex) ListItem(out *bytes.Buffer, text []byte, flags int) {
+	out.WriteString("\n\\item ")
+	out.Write(text)
+}
+
+func (options *Latex) Paragraph(out *bytes.Buffer, text func() bool) {
+	marker := out.Len()
+	out.WriteString("\n")
+	if !text() {
+		out.Truncate(marker)
+		return
+	}
+	out.WriteString("\n")
+}
+
+func (options *Latex) Table(out *bytes.Buffer, header []byte, body []byte, columnData []int) {
+	out.WriteString("\n\\begin{tabular}{")
+	for _, elt := range columnData {
+		switch elt {
+		case TABLE_ALIGNMENT_LEFT:
+			out.WriteByte('l')
+		case TABLE_ALIGNMENT_RIGHT:
+			out.WriteByte('r')
+		default:
+			out.WriteByte('c')
+		}
+	}
+	out.WriteString("}\n")
+	out.Write(header)
+	out.WriteString(" \\\\\n\\hline\n")
+	out.Write(body)
+	out.WriteString("\n\\end{tabular}\n")
+}
+
+func (options *Latex) TableRow(out *bytes.Buffer, text []byte) {
+	if out.Len() > 0 {
+		out.WriteString(" \\\\\n")
+	}
+	out.Write(text)
+}
+
+func (options *Latex) TableHeaderCell(out *bytes.Buffer, text []byte, align int) {
+	if out.Len() > 0 {
+		out.WriteString(" & ")
+	}
+	out.Write(text)
+}
+
+func (options *Latex) TableCell(out *bytes.Buffer, text []byte, align int) {
+	if out.Len() > 0 {
+		out.WriteString(" & ")
+	}
+	out.Write(text)
+}
+
+// TODO: this
+func (options *Latex) Footnotes(out *bytes.Buffer, text func() bool) {
+
+}
+
+func (options *Latex) FootnoteItem(out *bytes.Buffer, name, text []byte, flags int) {
+
+}
+
+func (options *Latex) AutoLink(out *bytes.Buffer, link []byte, kind int) {
+	out.WriteString("\\href{")
+	if kind == LINK_TYPE_EMAIL {
+		out.WriteString("mailto:")
+	}
+	out.Write(link)
+	out.WriteString("}{")
+	out.Write(link)
+	out.WriteString("}")
+}
+
+func (options *Latex) CodeSpan(out *bytes.Buffer, text []byte) {
+	out.WriteString("\\texttt{")
+	escapeSpecialChars(out, text)
+	out.WriteString("}")
+}
+
+func (options *Latex) DoubleEmphasis(out *bytes.Buffer, text []byte) {
+	out.WriteString("\\textbf{")
+	out.Write(text)
+	out.WriteString("}")
+}
+
+func (options *Latex) Emphasis(out *bytes.Buffer, text []byte) {
+	out.WriteString("\\textit{")
+	out.Write(text)
+	out.WriteString("}")
+}
+
+func (options *Latex) Image(out *bytes.Buffer, link []byte, title []byte, alt []byte) {
+	if bytes.HasPrefix(link, []byte("http://")) || bytes.HasPrefix(link, []byte("https://")) {
+		// treat it like a link
+		out.WriteString("\\href{")
+		out.Write(link)
+		out.WriteString("}{")
+		out.Write(alt)
+		out.WriteString("}")
+	} else {
+		out.WriteString("\\includegraphics{")
+		out.Write(link)
+		out.WriteString("}")
+	}
+}
+
+func (options *Latex) LineBreak(out *bytes.Buffer) {
+	out.WriteString(" \\\\\n")
+}
+
+func (options *Latex) Link(out *bytes.Buffer, link []byte, title []byte, content []byte) {
+	out.WriteString("\\href{")
+	out.Write(link)
+	out.WriteString("}{")
+	out.Write(content)
+	out.WriteString("}")
+}
+
+func (options *Latex) RawHtmlTag(out *bytes.Buffer, tag []byte) {
+}
+
+func (options *Latex) TripleEmphasis(out *bytes.Buffer, text []byte) {
+	out.WriteString("\\textbf{\\textit{")
+	out.Write(text)
+	out.WriteString("}}")
+}
+
+func (options *Latex) StrikeThrough(out *bytes.Buffer, text []byte) {
+	out.WriteString("\\sout{")
+	out.Write(text)
+	out.WriteString("}")
+}
+
+// TODO: this
+func (options *Latex) FootnoteRef(out *bytes.Buffer, ref []byte, id int) {
+
+}
+
+func needsBackslash(c byte) bool {
+	for _, r := range []byte("_{}%$&\\~#") {
+		if c == r {
+			return true
+		}
+	}
+	return false
+}
+
+func escapeSpecialChars(out *bytes.Buffer, text []byte) {
+	for i := 0; i < len(text); i++ {
+		// directly copy normal characters
+		org := i
+
+		for i < len(text) && !needsBackslash(text[i]) {
+			i++
+		}
+		if i > org {
+			out.Write(text[org:i])
+		}
+
+		// escape a character
+		if i >= len(text) {
+			break
+		}
+		out.WriteByte('\\')
+		out.WriteByte(text[i])
+	}
+}
+
+func (options *Latex) Entity(out *bytes.Buffer, entity []byte) {
+	// TODO: convert this into a unicode character or something
+	out.Write(entity)
+}
+
+func (options *Latex) NormalText(out *bytes.Buffer, text []byte) {
+	escapeSpecialChars(out, text)
+}
+
+// header and footer
+func (options *Latex) DocumentHeader(out *bytes.Buffer) {
+	out.WriteString("\\documentclass{article}\n")
+	out.WriteString("\n")
+	out.WriteString("\\usepackage{graphicx}\n")
+	out.WriteString("\\usepackage{listings}\n")
+	out.WriteString("\\usepackage[margin=1in]{geometry}\n")
+	out.WriteString("\\usepackage[utf8]{inputenc}\n")
+	out.WriteString("\\usepackage{verbatim}\n")
+	out.WriteString("\\usepackage[normalem]{ulem}\n")
+	out.WriteString("\\usepackage{hyperref}\n")
+	out.WriteString("\n")
+	out.WriteString("\\hypersetup{colorlinks,%\n")
+	out.WriteString("  citecolor=black,%\n")
+	out.WriteString("  filecolor=black,%\n")
+	out.WriteString("  linkcolor=black,%\n")
+	out.WriteString("  urlcolor=black,%\n")
+	out.WriteString("  pdfstartview=FitH,%\n")
+	out.WriteString("  breaklinks=true,%\n")
+	out.WriteString("  pdfauthor={Blackfriday Markdown Processor v")
+	out.WriteString(VERSION)
+	out.WriteString("}}\n")
+	out.WriteString("\n")
+	out.WriteString("\\newcommand{\\HRule}{\\rule{\\linewidth}{0.5mm}}\n")
+	out.WriteString("\\addtolength{\\parskip}{0.5\\baselineskip}\n")
+	out.WriteString("\\parindent=0pt\n")
+	out.WriteString("\n")
+	out.WriteString("\\begin{document}\n")
+}
+
+func (options *Latex) DocumentFooter(out *bytes.Buffer) {
+	out.WriteString("\n\\end{document}\n")
+}
diff --git a/vendor/github.com/russross/blackfriday/markdown.go b/vendor/github.com/russross/blackfriday/markdown.go
index ff61cb05..41595d62 100644
--- a/vendor/github.com/russross/blackfriday/markdown.go
+++ b/vendor/github.com/russross/blackfriday/markdown.go
@@ -1,200 +1,230 @@
+//
 // Blackfriday Markdown Processor
 // Available at http://github.com/russross/blackfriday
 //
 // Copyright © 2011 Russ Ross <russ@russross.com>.
 // Distributed under the Simplified BSD License.
 // See README.md for details.
+//
+
+//
+//
+// Markdown parsing and processing
+//
+//
 
 package blackfriday
 
 import (
 	"bytes"
 	"fmt"
-	"io"
 	"strings"
 	"unicode/utf8"
 )
 
-//
-// Markdown parsing and processing
-//
-
-// Version string of the package. Appears in the rendered document when
-// CompletePage flag is on.
-const Version = "2.0"
-
-// Extensions is a bitwise or'ed collection of enabled Blackfriday's
-// extensions.
-type Extensions int
+const VERSION = "1.5"
 
 // These are the supported markdown parsing extensions.
 // OR these values together to select multiple extensions.
 const (
-	NoExtensions           Extensions = 0
-	NoIntraEmphasis        Extensions = 1 << iota // Ignore emphasis markers inside words
-	Tables                                        // Render tables
-	FencedCode                                    // Render fenced code blocks
-	Autolink                                      // Detect embedded URLs that are not explicitly marked
-	Strikethrough                                 // Strikethrough text using ~~test~~
-	LaxHTMLBlocks                                 // Loosen up HTML block parsing rules
-	SpaceHeadings                                 // Be strict about prefix heading rules
-	HardLineBreak                                 // Translate newlines into line breaks
-	TabSizeEight                                  // Expand tabs to eight spaces instead of four
-	Footnotes                                     // Pandoc-style footnotes
-	NoEmptyLineBeforeBlock                        // No need to insert an empty line to start a (code, quote, ordered list, unordered list) block
-	HeadingIDs                                    // specify heading IDs  with {#id}
-	Titleblock                                    // Titleblock ala pandoc
-	AutoHeadingIDs                                // Create the heading ID from the text
-	BackslashLineBreak                            // Translate trailing backslashes into line breaks
-	DefinitionLists                               // Render definition lists
-
-	CommonHTMLFlags HTMLFlags = UseXHTML | Smartypants |
-		SmartypantsFractions | SmartypantsDashes | SmartypantsLatexDashes
-
-	CommonExtensions Extensions = NoIntraEmphasis | Tables | FencedCode |
-		Autolink | Strikethrough | SpaceHeadings | HeadingIDs |
-		BackslashLineBreak | DefinitionLists
+	EXTENSION_NO_INTRA_EMPHASIS          = 1 << iota // ignore emphasis markers inside words
+	EXTENSION_TABLES                                 // render tables
+	EXTENSION_FENCED_CODE                            // render fenced code blocks
+	EXTENSION_AUTOLINK                               // detect embedded URLs that are not explicitly marked
+	EXTENSION_STRIKETHROUGH                          // strikethrough text using ~~test~~
+	EXTENSION_LAX_HTML_BLOCKS                        // loosen up HTML block parsing rules
+	EXTENSION_SPACE_HEADERS                          // be strict about prefix header rules
+	EXTENSION_HARD_LINE_BREAK                        // translate newlines into line breaks
+	EXTENSION_TAB_SIZE_EIGHT                         // expand tabs to eight spaces instead of four
+	EXTENSION_FOOTNOTES                              // Pandoc-style footnotes
+	EXTENSION_NO_EMPTY_LINE_BEFORE_BLOCK             // No need to insert an empty line to start a (code, quote, ordered list, unordered list) block
+	EXTENSION_HEADER_IDS                             // specify header IDs  with {#id}
+	EXTENSION_TITLEBLOCK                             // Titleblock ala pandoc
+	EXTENSION_AUTO_HEADER_IDS                        // Create the header ID from the text
+	EXTENSION_BACKSLASH_LINE_BREAK                   // translate trailing backslashes into line breaks
+	EXTENSION_DEFINITION_LISTS                       // render definition lists
+	EXTENSION_JOIN_LINES                             // delete newline and join lines
+
+	commonHtmlFlags = 0 |
+		HTML_USE_XHTML |
+		HTML_USE_SMARTYPANTS |
+		HTML_SMARTYPANTS_FRACTIONS |
+		HTML_SMARTYPANTS_DASHES |
+		HTML_SMARTYPANTS_LATEX_DASHES
+
+	commonExtensions = 0 |
+		EXTENSION_NO_INTRA_EMPHASIS |
+		EXTENSION_TABLES |
+		EXTENSION_FENCED_CODE |
+		EXTENSION_AUTOLINK |
+		EXTENSION_STRIKETHROUGH |
+		EXTENSION_SPACE_HEADERS |
+		EXTENSION_HEADER_IDS |
+		EXTENSION_BACKSLASH_LINE_BREAK |
+		EXTENSION_DEFINITION_LISTS
 )
 
-// ListType contains bitwise or'ed flags for list and list item objects.
-type ListType int
+// These are the possible flag values for the link renderer.
+// Only a single one of these values will be used; they are not ORed together.
+// These are mostly of interest if you are writing a new output format.
+const (
+	LINK_TYPE_NOT_AUTOLINK = iota
+	LINK_TYPE_NORMAL
+	LINK_TYPE_EMAIL
+)
 
 // These are the possible flag values for the ListItem renderer.
 // Multiple flag values may be ORed together.
 // These are mostly of interest if you are writing a new output format.
 const (
-	ListTypeOrdered ListType = 1 << iota
-	ListTypeDefinition
-	ListTypeTerm
-
-	ListItemContainsBlock
-	ListItemBeginningOfList // TODO: figure out if this is of any use now
-	ListItemEndOfList
+	LIST_TYPE_ORDERED = 1 << iota
+	LIST_TYPE_DEFINITION
+	LIST_TYPE_TERM
+	LIST_ITEM_CONTAINS_BLOCK
+	LIST_ITEM_BEGINNING_OF_LIST
+	LIST_ITEM_END_OF_LIST
 )
 
-// CellAlignFlags holds a type of alignment in a table cell.
-type CellAlignFlags int
-
 // These are the possible flag values for the table cell renderer.
 // Only a single one of these values will be used; they are not ORed together.
 // These are mostly of interest if you are writing a new output format.
 const (
-	TableAlignmentLeft CellAlignFlags = 1 << iota
-	TableAlignmentRight
-	TableAlignmentCenter = (TableAlignmentLeft | TableAlignmentRight)
+	TABLE_ALIGNMENT_LEFT = 1 << iota
+	TABLE_ALIGNMENT_RIGHT
+	TABLE_ALIGNMENT_CENTER = (TABLE_ALIGNMENT_LEFT | TABLE_ALIGNMENT_RIGHT)
 )
 
 // The size of a tab stop.
 const (
-	TabSizeDefault = 4
-	TabSizeDouble  = 8
+	TAB_SIZE_DEFAULT = 4
+	TAB_SIZE_EIGHT   = 8
 )
 
 // blockTags is a set of tags that are recognized as HTML block tags.
 // Any of these can be included in markdown text without special escaping.
 var blockTags = map[string]struct{}{
-	"blockquote": struct{}{},
-	"del":        struct{}{},
-	"div":        struct{}{},
-	"dl":         struct{}{},
-	"fieldset":   struct{}{},
-	"form":       struct{}{},
-	"h1":         struct{}{},
-	"h2":         struct{}{},
-	"h3":         struct{}{},
-	"h4":         struct{}{},
-	"h5":         struct{}{},
-	"h6":         struct{}{},
-	"iframe":     struct{}{},
-	"ins":        struct{}{},
-	"math":       struct{}{},
-	"noscript":   struct{}{},
-	"ol":         struct{}{},
-	"pre":        struct{}{},
-	"p":          struct{}{},
-	"script":     struct{}{},
-	"style":      struct{}{},
-	"table":      struct{}{},
-	"ul":         struct{}{},
+	"blockquote": {},
+	"del":        {},
+	"div":        {},
+	"dl":         {},
+	"fieldset":   {},
+	"form":       {},
+	"h1":         {},
+	"h2":         {},
+	"h3":         {},
+	"h4":         {},
+	"h5":         {},
+	"h6":         {},
+	"iframe":     {},
+	"ins":        {},
+	"math":       {},
+	"noscript":   {},
+	"ol":         {},
+	"pre":        {},
+	"p":          {},
+	"script":     {},
+	"style":      {},
+	"table":      {},
+	"ul":         {},
 
 	// HTML5
-	"address":    struct{}{},
-	"article":    struct{}{},
-	"aside":      struct{}{},
-	"canvas":     struct{}{},
-	"figcaption": struct{}{},
-	"figure":     struct{}{},
-	"footer":     struct{}{},
-	"header":     struct{}{},
-	"hgroup":     struct{}{},
-	"main":       struct{}{},
-	"nav":        struct{}{},
-	"output":     struct{}{},
-	"progress":   struct{}{},
-	"section":    struct{}{},
-	"video":      struct{}{},
+	"address":    {},
+	"article":    {},
+	"aside":      {},
+	"canvas":     {},
+	"figcaption": {},
+	"figure":     {},
+	"footer":     {},
+	"header":     {},
+	"hgroup":     {},
+	"main":       {},
+	"nav":        {},
+	"output":     {},
+	"progress":   {},
+	"section":    {},
+	"video":      {},
 }
 
-// Renderer is the rendering interface. This is mostly of interest if you are
-// implementing a new rendering format.
+// Renderer is the rendering interface.
+// This is mostly of interest if you are implementing a new rendering format.
 //
-// Only an HTML implementation is provided in this repository, see the README
-// for external implementations.
+// When a byte slice is provided, it contains the (rendered) contents of the
+// element.
+//
+// When a callback is provided instead, it will write the contents of the
+// respective element directly to the output buffer and return true on success.
+// If the callback returns false, the rendering function should reset the
+// output buffer as though it had never been called.
+//
+// Currently Html and Latex implementations are provided
 type Renderer interface {
-	// RenderNode is the main rendering method. It will be called once for
-	// every leaf node and twice for every non-leaf node (first with
-	// entering=true, then with entering=false). The method should write its
-	// rendition of the node to the supplied writer w.
-	RenderNode(w io.Writer, node *Node, entering bool) WalkStatus
-
-	// RenderHeader is a method that allows the renderer to produce some
-	// content preceding the main body of the output document. The header is
-	// understood in the broad sense here. For example, the default HTML
-	// renderer will write not only the HTML document preamble, but also the
-	// table of contents if it was requested.
-	//
-	// The method will be passed an entire document tree, in case a particular
-	// implementation needs to inspect it to produce output.
-	//
-	// The output should be written to the supplied writer w. If your
-	// implementation has no header to write, supply an empty implementation.
-	RenderHeader(w io.Writer, ast *Node)
-
-	// RenderFooter is a symmetric counterpart of RenderHeader.
-	RenderFooter(w io.Writer, ast *Node)
+	// block-level callbacks
+	BlockCode(out *bytes.Buffer, text []byte, infoString string)
+	BlockQuote(out *bytes.Buffer, text []byte)
+	BlockHtml(out *bytes.Buffer, text []byte)
+	Header(out *bytes.Buffer, text func() bool, level int, id string)
+	HRule(out *bytes.Buffer)
+	List(out *bytes.Buffer, text func() bool, flags int)
+	ListItem(out *bytes.Buffer, text []byte, flags int)
+	Paragraph(out *bytes.Buffer, text func() bool)
+	Table(out *bytes.Buffer, header []byte, body []byte, columnData []int)
+	TableRow(out *bytes.Buffer, text []byte)
+	TableHeaderCell(out *bytes.Buffer, text []byte, flags int)
+	TableCell(out *bytes.Buffer, text []byte, flags int)
+	Footnotes(out *bytes.Buffer, text func() bool)
+	FootnoteItem(out *bytes.Buffer, name, text []byte, flags int)
+	TitleBlock(out *bytes.Buffer, text []byte)
+
+	// Span-level callbacks
+	AutoLink(out *bytes.Buffer, link []byte, kind int)
+	CodeSpan(out *bytes.Buffer, text []byte)
+	DoubleEmphasis(out *bytes.Buffer, text []byte)
+	Emphasis(out *bytes.Buffer, text []byte)
+	Image(out *bytes.Buffer, link []byte, title []byte, alt []byte)
+	LineBreak(out *bytes.Buffer)
+	Link(out *bytes.Buffer, link []byte, title []byte, content []byte)
+	RawHtmlTag(out *bytes.Buffer, tag []byte)
+	TripleEmphasis(out *bytes.Buffer, text []byte)
+	StrikeThrough(out *bytes.Buffer, text []byte)
+	FootnoteRef(out *bytes.Buffer, ref []byte, id int)
+
+	// Low-level callbacks
+	Entity(out *bytes.Buffer, entity []byte)
+	NormalText(out *bytes.Buffer, text []byte)
+
+	// Header and footer
+	DocumentHeader(out *bytes.Buffer)
+	DocumentFooter(out *bytes.Buffer)
+
+	GetFlags() int
 }
 
 // Callback functions for inline parsing. One such function is defined
 // for each character that triggers a response when parsing inline data.
-type inlineParser func(p *Markdown, data []byte, offset int) (int, *Node)
-
-// Markdown is a type that holds extensions and the runtime state used by
-// Parse, and the renderer. You can not use it directly, construct it with New.
-type Markdown struct {
-	renderer          Renderer
-	referenceOverride ReferenceOverrideFunc
-	refs              map[string]*reference
-	inlineCallback    [256]inlineParser
-	extensions        Extensions
-	nesting           int
-	maxNesting        int
-	insideLink        bool
+type inlineParser func(p *parser, out *bytes.Buffer, data []byte, offset int) int
+
+// Parser holds runtime state used by the parser.
+// This is constructed by the Markdown function.
+type parser struct {
+	r              Renderer
+	refOverride    ReferenceOverrideFunc
+	refs           map[string]*reference
+	inlineCallback [256]inlineParser
+	flags          int
+	nesting        int
+	maxNesting     int
+	insideLink     bool
 
 	// Footnotes need to be ordered as well as available to quickly check for
 	// presence. If a ref is also a footnote, it's stored both in refs and here
 	// in notes. Slice is nil if footnotes not enabled.
-	notes []*reference
-
-	doc                  *Node
-	tip                  *Node // = doc
-	oldTip               *Node
-	lastMatchedContainer *Node // = doc
-	allClosed            bool
+	notes       []*reference
+	notesRecord map[string]struct{}
 }
 
-func (p *Markdown) getRef(refid string) (ref *reference, found bool) {
-	if p.referenceOverride != nil {
-		r, overridden := p.referenceOverride(refid)
+func (p *parser) getRef(refid string) (ref *reference, found bool) {
+	if p.refOverride != nil {
+		r, overridden := p.refOverride(refid)
 		if overridden {
 			if r == nil {
 				return nil, false
@@ -202,7 +232,7 @@ func (p *Markdown) getRef(refid string) (ref *reference, found bool) {
 			return &reference{
 				link:     []byte(r.Link),
 				title:    []byte(r.Title),
-				noteID:   0,
+				noteId:   0,
 				hasBlock: false,
 				text:     []byte(r.Text)}, true
 		}
@@ -212,34 +242,9 @@ func (p *Markdown) getRef(refid string) (ref *reference, found bool) {
 	return ref, found
 }
 
-func (p *Markdown) finalize(block *Node) {
-	above := block.Parent
-	block.open = false
-	p.tip = above
-}
-
-func (p *Markdown) addChild(node NodeType, offset uint32) *Node {
-	return p.addExistingChild(NewNode(node), offset)
-}
-
-func (p *Markdown) addExistingChild(node *Node, offset uint32) *Node {
-	for !p.tip.canContain(node.Type) {
-		p.finalize(p.tip)
-	}
-	p.tip.AppendChild(node)
-	p.tip = node
-	return node
-}
-
-func (p *Markdown) closeUnmatchedBlocks() {
-	if !p.allClosed {
-		for p.oldTip != p.lastMatchedContainer {
-			parent := p.oldTip.Parent
-			p.finalize(p.oldTip)
-			p.oldTip = parent
-		}
-		p.allClosed = true
-	}
+func (p *parser) isFootnote(ref *reference) bool {
+	_, ok := p.notesRecord[string(ref.link)]
+	return ok
 }
 
 //
@@ -266,27 +271,102 @@ type Reference struct {
 // See the documentation in Options for more details on use-case.
 type ReferenceOverrideFunc func(reference string) (ref *Reference, overridden bool)
 
-// New constructs a Markdown processor. You can use the same With* functions as
-// for Run() to customize parser's behavior and the renderer.
-func New(opts ...Option) *Markdown {
-	var p Markdown
-	for _, opt := range opts {
-		opt(&p)
+// Options represents configurable overrides and callbacks (in addition to the
+// extension flag set) for configuring a Markdown parse.
+type Options struct {
+	// Extensions is a flag set of bit-wise ORed extension bits. See the
+	// EXTENSION_* flags defined in this package.
+	Extensions int
+
+	// ReferenceOverride is an optional function callback that is called every
+	// time a reference is resolved.
+	//
+	// In Markdown, the link reference syntax can be made to resolve a link to
+	// a reference instead of an inline URL, in one of the following ways:
+	//
+	//  * [link text][refid]
+	//  * [refid][]
+	//
+	// Usually, the refid is defined at the bottom of the Markdown document. If
+	// this override function is provided, the refid is passed to the override
+	// function first, before consulting the defined refids at the bottom. If
+	// the override function indicates an override did not occur, the refids at
+	// the bottom will be used to fill in the link details.
+	ReferenceOverride ReferenceOverrideFunc
+}
+
+// MarkdownBasic is a convenience function for simple rendering.
+// It processes markdown input with no extensions enabled.
+func MarkdownBasic(input []byte) []byte {
+	// set up the HTML renderer
+	htmlFlags := HTML_USE_XHTML
+	renderer := HtmlRenderer(htmlFlags, "", "")
+
+	// set up the parser
+	return MarkdownOptions(input, renderer, Options{Extensions: 0})
+}
+
+// Call Markdown with most useful extensions enabled
+// MarkdownCommon is a convenience function for simple rendering.
+// It processes markdown input with common extensions enabled, including:
+//
+// * Smartypants processing with smart fractions and LaTeX dashes
+//
+// * Intra-word emphasis suppression
+//
+// * Tables
+//
+// * Fenced code blocks
+//
+// * Autolinking
+//
+// * Strikethrough support
+//
+// * Strict header parsing
+//
+// * Custom Header IDs
+func MarkdownCommon(input []byte) []byte {
+	// set up the HTML renderer
+	renderer := HtmlRenderer(commonHtmlFlags, "", "")
+	return MarkdownOptions(input, renderer, Options{
+		Extensions: commonExtensions})
+}
+
+// Markdown is the main rendering function.
+// It parses and renders a block of markdown-encoded text.
+// The supplied Renderer is used to format the output, and extensions dictates
+// which non-standard extensions are enabled.
+//
+// To use the supplied Html or LaTeX renderers, see HtmlRenderer and
+// LatexRenderer, respectively.
+func Markdown(input []byte, renderer Renderer, extensions int) []byte {
+	return MarkdownOptions(input, renderer, Options{
+		Extensions: extensions})
+}
+
+// MarkdownOptions is just like Markdown but takes additional options through
+// the Options struct.
+func MarkdownOptions(input []byte, renderer Renderer, opts Options) []byte {
+	// no point in parsing if we can't render
+	if renderer == nil {
+		return nil
 	}
+
+	extensions := opts.Extensions
+
+	// fill in the render structure
+	p := new(parser)
+	p.r = renderer
+	p.flags = extensions
+	p.refOverride = opts.ReferenceOverride
 	p.refs = make(map[string]*reference)
 	p.maxNesting = 16
 	p.insideLink = false
-	docNode := NewNode(Document)
-	p.doc = docNode
-	p.tip = docNode
-	p.oldTip = docNode
-	p.lastMatchedContainer = docNode
-	p.allClosed = true
+
 	// register inline parsers
-	p.inlineCallback[' '] = maybeLineBreak
 	p.inlineCallback['*'] = emphasis
 	p.inlineCallback['_'] = emphasis
-	if p.extensions&Strikethrough != 0 {
+	if extensions&EXTENSION_STRIKETHROUGH != 0 {
 		p.inlineCallback['~'] = emphasis
 	}
 	p.inlineCallback['`'] = codeSpan
@@ -295,166 +375,116 @@ func New(opts ...Option) *Markdown {
 	p.inlineCallback['<'] = leftAngle
 	p.inlineCallback['\\'] = escape
 	p.inlineCallback['&'] = entity
-	p.inlineCallback['!'] = maybeImage
-	p.inlineCallback['^'] = maybeInlineFootnote
-	if p.extensions&Autolink != 0 {
-		p.inlineCallback['h'] = maybeAutoLink
-		p.inlineCallback['m'] = maybeAutoLink
-		p.inlineCallback['f'] = maybeAutoLink
-		p.inlineCallback['H'] = maybeAutoLink
-		p.inlineCallback['M'] = maybeAutoLink
-		p.inlineCallback['F'] = maybeAutoLink
-	}
-	if p.extensions&Footnotes != 0 {
+
+	if extensions&EXTENSION_AUTOLINK != 0 {
+		p.inlineCallback[':'] = autoLink
+	}
+
+	if extensions&EXTENSION_FOOTNOTES != 0 {
 		p.notes = make([]*reference, 0)
+		p.notesRecord = make(map[string]struct{})
 	}
-	return &p
+
+	first := firstPass(p, input)
+	second := secondPass(p, first)
+	return second
 }
 
-// Option customizes the Markdown processor's default behavior.
-type Option func(*Markdown)
+// first pass:
+// - normalize newlines
+// - extract references (outside of fenced code blocks)
+// - expand tabs (outside of fenced code blocks)
+// - copy everything else
+func firstPass(p *parser, input []byte) []byte {
+	var out bytes.Buffer
+	tabSize := TAB_SIZE_DEFAULT
+	if p.flags&EXTENSION_TAB_SIZE_EIGHT != 0 {
+		tabSize = TAB_SIZE_EIGHT
+	}
+	beg := 0
+	lastFencedCodeBlockEnd := 0
+	for beg < len(input) {
+		// Find end of this line, then process the line.
+		end := beg
+		for end < len(input) && input[end] != '\n' && input[end] != '\r' {
+			end++
+		}
 
-// WithRenderer allows you to override the default renderer.
-func WithRenderer(r Renderer) Option {
-	return func(p *Markdown) {
-		p.renderer = r
-	}
-}
+		if p.flags&EXTENSION_FENCED_CODE != 0 {
+			// track fenced code block boundaries to suppress tab expansion
+			// and reference extraction inside them:
+			if beg >= lastFencedCodeBlockEnd {
+				if i := p.fencedCodeBlock(&out, input[beg:], false); i > 0 {
+					lastFencedCodeBlockEnd = beg + i
+				}
+			}
+		}
 
-// WithExtensions allows you to pick some of the many extensions provided by
-// Blackfriday. You can bitwise OR them.
-func WithExtensions(e Extensions) Option {
-	return func(p *Markdown) {
-		p.extensions = e
-	}
-}
+		// add the line body if present
+		if end > beg {
+			if end < lastFencedCodeBlockEnd { // Do not expand tabs while inside fenced code blocks.
+				out.Write(input[beg:end])
+			} else if refEnd := isReference(p, input[beg:], tabSize); refEnd > 0 {
+				beg += refEnd
+				continue
+			} else {
+				expandTabs(&out, input[beg:end], tabSize)
+			}
+		}
 
-// WithNoExtensions turns off all extensions and custom behavior.
-func WithNoExtensions() Option {
-	return func(p *Markdown) {
-		p.extensions = NoExtensions
-		p.renderer = NewHTMLRenderer(HTMLRendererParameters{
-			Flags: HTMLFlagsNone,
-		})
+		if end < len(input) && input[end] == '\r' {
+			end++
+		}
+		if end < len(input) && input[end] == '\n' {
+			end++
+		}
+		out.WriteByte('\n')
+
+		beg = end
 	}
-}
 
-// WithRefOverride sets an optional function callback that is called every
-// time a reference is resolved.
-//
-// In Markdown, the link reference syntax can be made to resolve a link to
-// a reference instead of an inline URL, in one of the following ways:
-//
-//  * [link text][refid]
-//  * [refid][]
-//
-// Usually, the refid is defined at the bottom of the Markdown document. If
-// this override function is provided, the refid is passed to the override
-// function first, before consulting the defined refids at the bottom. If
-// the override function indicates an override did not occur, the refids at
-// the bottom will be used to fill in the link details.
-func WithRefOverride(o ReferenceOverrideFunc) Option {
-	return func(p *Markdown) {
-		p.referenceOverride = o
+	// empty input?
+	if out.Len() == 0 {
+		out.WriteByte('\n')
 	}
-}
 
-// Run is the main entry point to Blackfriday. It parses and renders a
-// block of markdown-encoded text.
-//
-// The simplest invocation of Run takes one argument, input:
-//     output := Run(input)
-// This will parse the input with CommonExtensions enabled and render it with
-// the default HTMLRenderer (with CommonHTMLFlags).
-//
-// Variadic arguments opts can customize the default behavior. Since Markdown
-// type does not contain exported fields, you can not use it directly. Instead,
-// use the With* functions. For example, this will call the most basic
-// functionality, with no extensions:
-//     output := Run(input, WithNoExtensions())
-//
-// You can use any number of With* arguments, even contradicting ones. They
-// will be applied in order of appearance and the latter will override the
-// former:
-//     output := Run(input, WithNoExtensions(), WithExtensions(exts),
-//         WithRenderer(yourRenderer))
-func Run(input []byte, opts ...Option) []byte {
-	r := NewHTMLRenderer(HTMLRendererParameters{
-		Flags: CommonHTMLFlags,
-	})
-	optList := []Option{WithRenderer(r), WithExtensions(CommonExtensions)}
-	optList = append(optList, opts...)
-	parser := New(optList...)
-	ast := parser.Parse(input)
-	var buf bytes.Buffer
-	parser.renderer.RenderHeader(&buf, ast)
-	ast.Walk(func(node *Node, entering bool) WalkStatus {
-		return parser.renderer.RenderNode(&buf, node, entering)
-	})
-	parser.renderer.RenderFooter(&buf, ast)
-	return buf.Bytes()
+	return out.Bytes()
 }
 
-// Parse is an entry point to the parsing part of Blackfriday. It takes an
-// input markdown document and produces a syntax tree for its contents. This
-// tree can then be rendered with a default or custom renderer, or
-// analyzed/transformed by the caller to whatever non-standard needs they have.
-// The return value is the root node of the syntax tree.
-func (p *Markdown) Parse(input []byte) *Node {
-	p.block(input)
-	// Walk the tree and finish up some of unfinished blocks
-	for p.tip != nil {
-		p.finalize(p.tip)
-	}
-	// Walk the tree again and process inline markdown in each block
-	p.doc.Walk(func(node *Node, entering bool) WalkStatus {
-		if node.Type == Paragraph || node.Type == Heading || node.Type == TableCell {
-			p.inline(node, node.content)
-			node.content = nil
-		}
-		return GoToNext
-	})
-	p.parseRefsToAST()
-	return p.doc
-}
+// second pass: actual rendering
+func secondPass(p *parser, input []byte) []byte {
+	var output bytes.Buffer
+
+	p.r.DocumentHeader(&output)
+	p.block(&output, input)
+
+	if p.flags&EXTENSION_FOOTNOTES != 0 && len(p.notes) > 0 {
+		p.r.Footnotes(&output, func() bool {
+			flags := LIST_ITEM_BEGINNING_OF_LIST
+			for i := 0; i < len(p.notes); i += 1 {
+				ref := p.notes[i]
+				var buf bytes.Buffer
+				if ref.hasBlock {
+					flags |= LIST_ITEM_CONTAINS_BLOCK
+					p.block(&buf, ref.title)
+				} else {
+					p.inline(&buf, ref.title)
+				}
+				p.r.FootnoteItem(&output, ref.link, buf.Bytes(), flags)
+				flags &^= LIST_ITEM_BEGINNING_OF_LIST | LIST_ITEM_CONTAINS_BLOCK
+			}
 
-func (p *Markdown) parseRefsToAST() {
-	if p.extensions&Footnotes == 0 || len(p.notes) == 0 {
-		return
+			return true
+		})
 	}
-	p.tip = p.doc
-	block := p.addBlock(List, nil)
-	block.IsFootnotesList = true
-	block.ListFlags = ListTypeOrdered
-	flags := ListItemBeginningOfList
-	// Note: this loop is intentionally explicit, not range-form. This is
-	// because the body of the loop will append nested footnotes to p.notes and
-	// we need to process those late additions. Range form would only walk over
-	// the fixed initial set.
-	for i := 0; i < len(p.notes); i++ {
-		ref := p.notes[i]
-		p.addExistingChild(ref.footnote, 0)
-		block := ref.footnote
-		block.ListFlags = flags | ListTypeOrdered
-		block.RefLink = ref.link
-		if ref.hasBlock {
-			flags |= ListItemContainsBlock
-			p.block(ref.title)
-		} else {
-			p.inline(block, ref.title)
-		}
-		flags &^= ListItemBeginningOfList | ListItemContainsBlock
-	}
-	above := block.Parent
-	finalizeList(block)
-	p.tip = above
-	block.Walk(func(node *Node, entering bool) WalkStatus {
-		if node.Type == Paragraph || node.Type == Heading {
-			p.inline(node, node.content)
-			node.content = nil
-		}
-		return GoToNext
-	})
+
+	p.r.DocumentFooter(&output)
+
+	if p.nesting != 0 {
+		panic("Nesting level did not end at zero")
+	}
+
+	return output.Bytes()
 }
 
 //
@@ -486,56 +516,18 @@ func (p *Markdown) parseRefsToAST() {
 //
 // are not yet supported.
 
-// reference holds all information necessary for a reference-style links or
-// footnotes.
-//
-// Consider this markdown with reference-style links:
-//
-//     [link][ref]
-//
-//     [ref]: /url/ "tooltip title"
-//
-// It will be ultimately converted to this HTML:
-//
-//     <p><a href=\"/url/\" title=\"title\">link</a></p>
-//
-// And a reference structure will be populated as follows:
-//
-//     p.refs["ref"] = &reference{
-//         link: "/url/",
-//         title: "tooltip title",
-//     }
-//
-// Alternatively, reference can contain information about a footnote. Consider
-// this markdown:
-//
-//     Text needing a footnote.[^a]
-//
-//     [^a]: This is the note
-//
-// A reference structure will be populated as follows:
-//
-//     p.refs["a"] = &reference{
-//         link: "a",
-//         title: "This is the note",
-//         noteID: <some positive int>,
-//     }
-//
-// TODO: As you can see, it begs for splitting into two dedicated structures
-// for refs and for footnotes.
+// References are parsed and stored in this struct.
 type reference struct {
 	link     []byte
 	title    []byte
-	noteID   int // 0 if not a footnote ref
+	noteId   int // 0 if not a footnote ref
 	hasBlock bool
-	footnote *Node // a link to the Item node within a list of footnotes
-
-	text []byte // only gets populated by refOverride feature with Reference.Text
+	text     []byte
 }
 
 func (r *reference) String() string {
-	return fmt.Sprintf("{link: %q, title: %q, text: %q, noteID: %d, hasBlock: %v}",
-		r.link, r.title, r.text, r.noteID, r.hasBlock)
+	return fmt.Sprintf("{link: %q, title: %q, text: %q, noteId: %d, hasBlock: %v}",
+		r.link, r.title, r.text, r.noteId, r.hasBlock)
 }
 
 // Check whether or not data starts with a reference link.
@@ -543,7 +535,7 @@ func (r *reference) String() string {
 // (in the render struct).
 // Returns the number of bytes to skip to move past it,
 // or zero if the first line is not a reference.
-func isReference(p *Markdown, data []byte, tabSize int) int {
+func isReference(p *parser, data []byte, tabSize int) int {
 	// up to 3 optional leading spaces
 	if len(data) < 4 {
 		return 0
@@ -553,18 +545,18 @@ func isReference(p *Markdown, data []byte, tabSize int) int {
 		i++
 	}
 
-	noteID := 0
+	noteId := 0
 
 	// id part: anything but a newline between brackets
 	if data[i] != '[' {
 		return 0
 	}
 	i++
-	if p.extensions&Footnotes != 0 {
+	if p.flags&EXTENSION_FOOTNOTES != 0 {
 		if i < len(data) && data[i] == '^' {
 			// we can set it to anything here because the proper noteIds will
 			// be assigned later during the second pass. It just has to be != 0
-			noteID = 1
+			noteId = 1
 			i++
 		}
 	}
@@ -576,11 +568,7 @@ func isReference(p *Markdown, data []byte, tabSize int) int {
 		return 0
 	}
 	idEnd := i
-	// footnotes can have empty ID, like this: [^], but a reference can not be
-	// empty like this: []. Break early if it's not a footnote and there's no ID
-	if noteID == 0 && idOffset == idEnd {
-		return 0
-	}
+
 	// spacer: colon (space | tab)* newline? (space | tab)*
 	i++
 	if i >= len(data) || data[i] != ':' {
@@ -611,7 +599,7 @@ func isReference(p *Markdown, data []byte, tabSize int) int {
 		hasBlock              bool
 	)
 
-	if p.extensions&Footnotes != 0 && noteID != 0 {
+	if p.flags&EXTENSION_FOOTNOTES != 0 && noteId != 0 {
 		linkOffset, linkEnd, raw, hasBlock = scanFootnote(p, data, i, tabSize)
 		lineEnd = linkEnd
 	} else {
@@ -624,11 +612,11 @@ func isReference(p *Markdown, data []byte, tabSize int) int {
 	// a valid ref has been found
 
 	ref := &reference{
-		noteID:   noteID,
+		noteId:   noteId,
 		hasBlock: hasBlock,
 	}
 
-	if noteID > 0 {
+	if noteId > 0 {
 		// reusing the link field for the id since footnotes don't have links
 		ref.link = data[idOffset:idEnd]
 		// if footnote, it's not really a title, it's the contained text
@@ -646,12 +634,15 @@ func isReference(p *Markdown, data []byte, tabSize int) int {
 	return lineEnd
 }
 
-func scanLinkRef(p *Markdown, data []byte, i int) (linkOffset, linkEnd, titleOffset, titleEnd, lineEnd int) {
+func scanLinkRef(p *parser, data []byte, i int) (linkOffset, linkEnd, titleOffset, titleEnd, lineEnd int) {
 	// link: whitespace-free sequence, optionally between angle brackets
 	if data[i] == '<' {
 		i++
 	}
 	linkOffset = i
+	if i == len(data) {
+		return
+	}
 	for i < len(data) && data[i] != ' ' && data[i] != '\t' && data[i] != '\n' && data[i] != '\r' {
 		i++
 	}
@@ -714,13 +705,13 @@ func scanLinkRef(p *Markdown, data []byte, i int) (linkOffset, linkEnd, titleOff
 	return
 }
 
-// The first bit of this logic is the same as Parser.listItem, but the rest
+// The first bit of this logic is the same as (*parser).listItem, but the rest
 // is much simpler. This function simply finds the entire block and shifts it
 // over by one tab if it is indeed a block (just returns the line if it's not).
 // blockEnd is the end of the section in the input buffer, and contents is the
 // extracted text that was shifted over one tab. It will need to be rendered at
 // the end of the document.
-func scanFootnote(p *Markdown, data []byte, i, indentSize int) (blockStart, blockEnd int, contents []byte, hasBlock bool) {
+func scanFootnote(p *parser, data []byte, i, indentSize int) (blockStart, blockEnd int, contents []byte, hasBlock bool) {
 	if i == 0 || len(data) == 0 {
 		return
 	}
@@ -813,7 +804,17 @@ func ispunct(c byte) bool {
 
 // Test if a character is a whitespace character.
 func isspace(c byte) bool {
-	return c == ' ' || c == '\t' || c == '\n' || c == '\r' || c == '\f' || c == '\v'
+	return ishorizontalspace(c) || isverticalspace(c)
+}
+
+// Test if a character is a horizontal whitespace character.
+func ishorizontalspace(c byte) bool {
+	return c == ' ' || c == '\t'
+}
+
+// Test if a character is a vertical whitespace character.
+func isverticalspace(c byte) bool {
+	return c == '\n' || c == '\r' || c == '\f' || c == '\v'
 }
 
 // Test if a character is letter.
diff --git a/vendor/github.com/russross/blackfriday/node.go b/vendor/github.com/russross/blackfriday/node.go
deleted file mode 100644
index 51b9e8c1..00000000
--- a/vendor/github.com/russross/blackfriday/node.go
+++ /dev/null
@@ -1,354 +0,0 @@
-package blackfriday
-
-import (
-	"bytes"
-	"fmt"
-)
-
-// NodeType specifies a type of a single node of a syntax tree. Usually one
-// node (and its type) corresponds to a single markdown feature, e.g. emphasis
-// or code block.
-type NodeType int
-
-// Constants for identifying different types of nodes. See NodeType.
-const (
-	Document NodeType = iota
-	BlockQuote
-	List
-	Item
-	Paragraph
-	Heading
-	HorizontalRule
-	Emph
-	Strong
-	Del
-	Link
-	Image
-	Text
-	HTMLBlock
-	CodeBlock
-	Softbreak
-	Hardbreak
-	Code
-	HTMLSpan
-	Table
-	TableCell
-	TableHead
-	TableBody
-	TableRow
-)
-
-var nodeTypeNames = []string{
-	Document:       "Document",
-	BlockQuote:     "BlockQuote",
-	List:           "List",
-	Item:           "Item",
-	Paragraph:      "Paragraph",
-	Heading:        "Heading",
-	HorizontalRule: "HorizontalRule",
-	Emph:           "Emph",
-	Strong:         "Strong",
-	Del:            "Del",
-	Link:           "Link",
-	Image:          "Image",
-	Text:           "Text",
-	HTMLBlock:      "HTMLBlock",
-	CodeBlock:      "CodeBlock",
-	Softbreak:      "Softbreak",
-	Hardbreak:      "Hardbreak",
-	Code:           "Code",
-	HTMLSpan:       "HTMLSpan",
-	Table:          "Table",
-	TableCell:      "TableCell",
-	TableHead:      "TableHead",
-	TableBody:      "TableBody",
-	TableRow:       "TableRow",
-}
-
-func (t NodeType) String() string {
-	return nodeTypeNames[t]
-}
-
-// ListData contains fields relevant to a List and Item node type.
-type ListData struct {
-	ListFlags       ListType
-	Tight           bool   // Skip <p>s around list item data if true
-	BulletChar      byte   // '*', '+' or '-' in bullet lists
-	Delimiter       byte   // '.' or ')' after the number in ordered lists
-	RefLink         []byte // If not nil, turns this list item into a footnote item and triggers different rendering
-	IsFootnotesList bool   // This is a list of footnotes
-}
-
-// LinkData contains fields relevant to a Link node type.
-type LinkData struct {
-	Destination []byte // Destination is what goes into a href
-	Title       []byte // Title is the tooltip thing that goes in a title attribute
-	NoteID      int    // NoteID contains a serial number of a footnote, zero if it's not a footnote
-	Footnote    *Node  // If it's a footnote, this is a direct link to the footnote Node. Otherwise nil.
-}
-
-// CodeBlockData contains fields relevant to a CodeBlock node type.
-type CodeBlockData struct {
-	IsFenced    bool   // Specifies whether it's a fenced code block or an indented one
-	Info        []byte // This holds the info string
-	FenceChar   byte
-	FenceLength int
-	FenceOffset int
-}
-
-// TableCellData contains fields relevant to a TableCell node type.
-type TableCellData struct {
-	IsHeader bool           // This tells if it's under the header row
-	Align    CellAlignFlags // This holds the value for align attribute
-}
-
-// HeadingData contains fields relevant to a Heading node type.
-type HeadingData struct {
-	Level        int    // This holds the heading level number
-	HeadingID    string // This might hold heading ID, if present
-	IsTitleblock bool   // Specifies whether it's a title block
-}
-
-// Node is a single element in the abstract syntax tree of the parsed document.
-// It holds connections to the structurally neighboring nodes and, for certain
-// types of nodes, additional information that might be needed when rendering.
-type Node struct {
-	Type       NodeType // Determines the type of the node
-	Parent     *Node    // Points to the parent
-	FirstChild *Node    // Points to the first child, if any
-	LastChild  *Node    // Points to the last child, if any
-	Prev       *Node    // Previous sibling; nil if it's the first child
-	Next       *Node    // Next sibling; nil if it's the last child
-
-	Literal []byte // Text contents of the leaf nodes
-
-	HeadingData   // Populated if Type is Heading
-	ListData      // Populated if Type is List
-	CodeBlockData // Populated if Type is CodeBlock
-	LinkData      // Populated if Type is Link
-	TableCellData // Populated if Type is TableCell
-
-	content []byte // Markdown content of the block nodes
-	open    bool   // Specifies an open block node that has not been finished to process yet
-}
-
-// NewNode allocates a node of a specified type.
-func NewNode(typ NodeType) *Node {
-	return &Node{
-		Type: typ,
-		open: true,
-	}
-}
-
-func (n *Node) String() string {
-	ellipsis := ""
-	snippet := n.Literal
-	if len(snippet) > 16 {
-		snippet = snippet[:16]
-		ellipsis = "..."
-	}
-	return fmt.Sprintf("%s: '%s%s'", n.Type, snippet, ellipsis)
-}
-
-// Unlink removes node 'n' from the tree.
-// It panics if the node is nil.
-func (n *Node) Unlink() {
-	if n.Prev != nil {
-		n.Prev.Next = n.Next
-	} else if n.Parent != nil {
-		n.Parent.FirstChild = n.Next
-	}
-	if n.Next != nil {
-		n.Next.Prev = n.Prev
-	} else if n.Parent != nil {
-		n.Parent.LastChild = n.Prev
-	}
-	n.Parent = nil
-	n.Next = nil
-	n.Prev = nil
-}
-
-// AppendChild adds a node 'child' as a child of 'n'.
-// It panics if either node is nil.
-func (n *Node) AppendChild(child *Node) {
-	child.Unlink()
-	child.Parent = n
-	if n.LastChild != nil {
-		n.LastChild.Next = child
-		child.Prev = n.LastChild
-		n.LastChild = child
-	} else {
-		n.FirstChild = child
-		n.LastChild = child
-	}
-}
-
-// InsertBefore inserts 'sibling' immediately before 'n'.
-// It panics if either node is nil.
-func (n *Node) InsertBefore(sibling *Node) {
-	sibling.Unlink()
-	sibling.Prev = n.Prev
-	if sibling.Prev != nil {
-		sibling.Prev.Next = sibling
-	}
-	sibling.Next = n
-	n.Prev = sibling
-	sibling.Parent = n.Parent
-	if sibling.Prev == nil {
-		sibling.Parent.FirstChild = sibling
-	}
-}
-
-func (n *Node) isContainer() bool {
-	switch n.Type {
-	case Document:
-		fallthrough
-	case BlockQuote:
-		fallthrough
-	case List:
-		fallthrough
-	case Item:
-		fallthrough
-	case Paragraph:
-		fallthrough
-	case Heading:
-		fallthrough
-	case Emph:
-		fallthrough
-	case Strong:
-		fallthrough
-	case Del:
-		fallthrough
-	case Link:
-		fallthrough
-	case Image:
-		fallthrough
-	case Table:
-		fallthrough
-	case TableHead:
-		fallthrough
-	case TableBody:
-		fallthrough
-	case TableRow:
-		fallthrough
-	case TableCell:
-		return true
-	default:
-		return false
-	}
-}
-
-func (n *Node) canContain(t NodeType) bool {
-	if n.Type == List {
-		return t == Item
-	}
-	if n.Type == Document || n.Type == BlockQuote || n.Type == Item {
-		return t != Item
-	}
-	if n.Type == Table {
-		return t == TableHead || t == TableBody
-	}
-	if n.Type == TableHead || n.Type == TableBody {
-		return t == TableRow
-	}
-	if n.Type == TableRow {
-		return t == TableCell
-	}
-	return false
-}
-
-// WalkStatus allows NodeVisitor to have some control over the tree traversal.
-// It is returned from NodeVisitor and different values allow Node.Walk to
-// decide which node to go to next.
-type WalkStatus int
-
-const (
-	// GoToNext is the default traversal of every node.
-	GoToNext WalkStatus = iota
-	// SkipChildren tells walker to skip all children of current node.
-	SkipChildren
-	// Terminate tells walker to terminate the traversal.
-	Terminate
-)
-
-// NodeVisitor is a callback to be called when traversing the syntax tree.
-// Called twice for every node: once with entering=true when the branch is
-// first visited, then with entering=false after all the children are done.
-type NodeVisitor func(node *Node, entering bool) WalkStatus
-
-// Walk is a convenience method that instantiates a walker and starts a
-// traversal of subtree rooted at n.
-func (n *Node) Walk(visitor NodeVisitor) {
-	w := newNodeWalker(n)
-	for w.current != nil {
-		status := visitor(w.current, w.entering)
-		switch status {
-		case GoToNext:
-			w.next()
-		case SkipChildren:
-			w.entering = false
-			w.next()
-		case Terminate:
-			return
-		}
-	}
-}
-
-type nodeWalker struct {
-	current  *Node
-	root     *Node
-	entering bool
-}
-
-func newNodeWalker(root *Node) *nodeWalker {
-	return &nodeWalker{
-		current:  root,
-		root:     root,
-		entering: true,
-	}
-}
-
-func (nw *nodeWalker) next() {
-	if (!nw.current.isContainer() || !nw.entering) && nw.current == nw.root {
-		nw.current = nil
-		return
-	}
-	if nw.entering && nw.current.isContainer() {
-		if nw.current.FirstChild != nil {
-			nw.current = nw.current.FirstChild
-			nw.entering = true
-		} else {
-			nw.entering = false
-		}
-	} else if nw.current.Next == nil {
-		nw.current = nw.current.Parent
-		nw.entering = false
-	} else {
-		nw.current = nw.current.Next
-		nw.entering = true
-	}
-}
-
-func dump(ast *Node) {
-	fmt.Println(dumpString(ast))
-}
-
-func dumpR(ast *Node, depth int) string {
-	if ast == nil {
-		return ""
-	}
-	indent := bytes.Repeat([]byte("\t"), depth)
-	content := ast.Literal
-	if content == nil {
-		content = ast.content
-	}
-	result := fmt.Sprintf("%s%s(%q)\n", indent, ast.Type, content)
-	for n := ast.FirstChild; n != nil; n = n.Next {
-		result += dumpR(n, depth+1)
-	}
-	return result
-}
-
-func dumpString(ast *Node) string {
-	return dumpR(ast, 0)
-}
diff --git a/vendor/github.com/russross/blackfriday/smartypants.go b/vendor/github.com/russross/blackfriday/smartypants.go
index 3a220e94..f25bd07d 100644
--- a/vendor/github.com/russross/blackfriday/smartypants.go
+++ b/vendor/github.com/russross/blackfriday/smartypants.go
@@ -17,14 +17,11 @@ package blackfriday
 
 import (
 	"bytes"
-	"io"
 )
 
-// SPRenderer is a struct containing state of a Smartypants renderer.
-type SPRenderer struct {
+type smartypantsData struct {
 	inSingleQuote bool
 	inDoubleQuote bool
-	callbacks     [256]smartCallback
 }
 
 func wordBoundary(c byte) bool {
@@ -121,7 +118,7 @@ func smartQuoteHelper(out *bytes.Buffer, previousChar byte, nextChar byte, quote
 	return true
 }
 
-func (r *SPRenderer) smartSingleQuote(out *bytes.Buffer, previousChar byte, text []byte) int {
+func smartSingleQuote(out *bytes.Buffer, smrt *smartypantsData, previousChar byte, text []byte) int {
 	if len(text) >= 2 {
 		t1 := tolower(text[1])
 
@@ -130,7 +127,7 @@ func (r *SPRenderer) smartSingleQuote(out *bytes.Buffer, previousChar byte, text
 			if len(text) >= 3 {
 				nextChar = text[2]
 			}
-			if smartQuoteHelper(out, previousChar, nextChar, 'd', &r.inDoubleQuote, false) {
+			if smartQuoteHelper(out, previousChar, nextChar, 'd', &smrt.inDoubleQuote, false) {
 				return 1
 			}
 		}
@@ -155,7 +152,7 @@ func (r *SPRenderer) smartSingleQuote(out *bytes.Buffer, previousChar byte, text
 	if len(text) > 1 {
 		nextChar = text[1]
 	}
-	if smartQuoteHelper(out, previousChar, nextChar, 's', &r.inSingleQuote, false) {
+	if smartQuoteHelper(out, previousChar, nextChar, 's', &smrt.inSingleQuote, false) {
 		return 0
 	}
 
@@ -163,7 +160,7 @@ func (r *SPRenderer) smartSingleQuote(out *bytes.Buffer, previousChar byte, text
 	return 0
 }
 
-func (r *SPRenderer) smartParens(out *bytes.Buffer, previousChar byte, text []byte) int {
+func smartParens(out *bytes.Buffer, smrt *smartypantsData, previousChar byte, text []byte) int {
 	if len(text) >= 3 {
 		t1 := tolower(text[1])
 		t2 := tolower(text[2])
@@ -188,7 +185,7 @@ func (r *SPRenderer) smartParens(out *bytes.Buffer, previousChar byte, text []by
 	return 0
 }
 
-func (r *SPRenderer) smartDash(out *bytes.Buffer, previousChar byte, text []byte) int {
+func smartDash(out *bytes.Buffer, smrt *smartypantsData, previousChar byte, text []byte) int {
 	if len(text) >= 2 {
 		if text[1] == '-' {
 			out.WriteString("&mdash;")
@@ -205,7 +202,7 @@ func (r *SPRenderer) smartDash(out *bytes.Buffer, previousChar byte, text []byte
 	return 0
 }
 
-func (r *SPRenderer) smartDashLatex(out *bytes.Buffer, previousChar byte, text []byte) int {
+func smartDashLatex(out *bytes.Buffer, smrt *smartypantsData, previousChar byte, text []byte) int {
 	if len(text) >= 3 && text[1] == '-' && text[2] == '-' {
 		out.WriteString("&mdash;")
 		return 2
@@ -219,13 +216,13 @@ func (r *SPRenderer) smartDashLatex(out *bytes.Buffer, previousChar byte, text [
 	return 0
 }
 
-func (r *SPRenderer) smartAmpVariant(out *bytes.Buffer, previousChar byte, text []byte, quote byte, addNBSP bool) int {
+func smartAmpVariant(out *bytes.Buffer, smrt *smartypantsData, previousChar byte, text []byte, quote byte, addNBSP bool) int {
 	if bytes.HasPrefix(text, []byte("&quot;")) {
 		nextChar := byte(0)
 		if len(text) >= 7 {
 			nextChar = text[6]
 		}
-		if smartQuoteHelper(out, previousChar, nextChar, quote, &r.inDoubleQuote, addNBSP) {
+		if smartQuoteHelper(out, previousChar, nextChar, quote, &smrt.inDoubleQuote, addNBSP) {
 			return 5
 		}
 	}
@@ -238,18 +235,18 @@ func (r *SPRenderer) smartAmpVariant(out *bytes.Buffer, previousChar byte, text
 	return 0
 }
 
-func (r *SPRenderer) smartAmp(angledQuotes, addNBSP bool) func(*bytes.Buffer, byte, []byte) int {
+func smartAmp(angledQuotes, addNBSP bool) func(out *bytes.Buffer, smrt *smartypantsData, previousChar byte, text []byte) int {
 	var quote byte = 'd'
 	if angledQuotes {
 		quote = 'a'
 	}
 
-	return func(out *bytes.Buffer, previousChar byte, text []byte) int {
-		return r.smartAmpVariant(out, previousChar, text, quote, addNBSP)
+	return func(out *bytes.Buffer, smrt *smartypantsData, previousChar byte, text []byte) int {
+		return smartAmpVariant(out, smrt, previousChar, text, quote, addNBSP)
 	}
 }
 
-func (r *SPRenderer) smartPeriod(out *bytes.Buffer, previousChar byte, text []byte) int {
+func smartPeriod(out *bytes.Buffer, smrt *smartypantsData, previousChar byte, text []byte) int {
 	if len(text) >= 3 && text[1] == '.' && text[2] == '.' {
 		out.WriteString("&hellip;")
 		return 2
@@ -264,13 +261,13 @@ func (r *SPRenderer) smartPeriod(out *bytes.Buffer, previousChar byte, text []by
 	return 0
 }
 
-func (r *SPRenderer) smartBacktick(out *bytes.Buffer, previousChar byte, text []byte) int {
+func smartBacktick(out *bytes.Buffer, smrt *smartypantsData, previousChar byte, text []byte) int {
 	if len(text) >= 2 && text[1] == '`' {
 		nextChar := byte(0)
 		if len(text) >= 3 {
 			nextChar = text[2]
 		}
-		if smartQuoteHelper(out, previousChar, nextChar, 'd', &r.inDoubleQuote, false) {
+		if smartQuoteHelper(out, previousChar, nextChar, 'd', &smrt.inDoubleQuote, false) {
 			return 1
 		}
 	}
@@ -279,7 +276,7 @@ func (r *SPRenderer) smartBacktick(out *bytes.Buffer, previousChar byte, text []
 	return 0
 }
 
-func (r *SPRenderer) smartNumberGeneric(out *bytes.Buffer, previousChar byte, text []byte) int {
+func smartNumberGeneric(out *bytes.Buffer, smrt *smartypantsData, previousChar byte, text []byte) int {
 	if wordBoundary(previousChar) && previousChar != '/' && len(text) >= 3 {
 		// is it of the form digits/digits(word boundary)?, i.e., \d+/\d+\b
 		// note: check for regular slash (/) or fraction slash (⁄, 0x2044, or 0xe2 81 84 in utf-8)
@@ -321,7 +318,7 @@ func (r *SPRenderer) smartNumberGeneric(out *bytes.Buffer, previousChar byte, te
 	return 0
 }
 
-func (r *SPRenderer) smartNumber(out *bytes.Buffer, previousChar byte, text []byte) int {
+func smartNumber(out *bytes.Buffer, smrt *smartypantsData, previousChar byte, text []byte) int {
 	if wordBoundary(previousChar) && previousChar != '/' && len(text) >= 3 {
 		if text[0] == '1' && text[1] == '/' && text[2] == '2' {
 			if len(text) < 4 || wordBoundary(text[3]) && text[3] != '/' {
@@ -349,27 +346,27 @@ func (r *SPRenderer) smartNumber(out *bytes.Buffer, previousChar byte, text []by
 	return 0
 }
 
-func (r *SPRenderer) smartDoubleQuoteVariant(out *bytes.Buffer, previousChar byte, text []byte, quote byte) int {
+func smartDoubleQuoteVariant(out *bytes.Buffer, smrt *smartypantsData, previousChar byte, text []byte, quote byte) int {
 	nextChar := byte(0)
 	if len(text) > 1 {
 		nextChar = text[1]
 	}
-	if !smartQuoteHelper(out, previousChar, nextChar, quote, &r.inDoubleQuote, false) {
+	if !smartQuoteHelper(out, previousChar, nextChar, quote, &smrt.inDoubleQuote, false) {
 		out.WriteString("&quot;")
 	}
 
 	return 0
 }
 
-func (r *SPRenderer) smartDoubleQuote(out *bytes.Buffer, previousChar byte, text []byte) int {
-	return r.smartDoubleQuoteVariant(out, previousChar, text, 'd')
+func smartDoubleQuote(out *bytes.Buffer, smrt *smartypantsData, previousChar byte, text []byte) int {
+	return smartDoubleQuoteVariant(out, smrt, previousChar, text, 'd')
 }
 
-func (r *SPRenderer) smartAngledDoubleQuote(out *bytes.Buffer, previousChar byte, text []byte) int {
-	return r.smartDoubleQuoteVariant(out, previousChar, text, 'a')
+func smartAngledDoubleQuote(out *bytes.Buffer, smrt *smartypantsData, previousChar byte, text []byte) int {
+	return smartDoubleQuoteVariant(out, smrt, previousChar, text, 'a')
 }
 
-func (r *SPRenderer) smartLeftAngle(out *bytes.Buffer, previousChar byte, text []byte) int {
+func smartLeftAngle(out *bytes.Buffer, smrt *smartypantsData, previousChar byte, text []byte) int {
 	i := 0
 
 	for i < len(text) && text[i] != '>' {
@@ -380,78 +377,54 @@ func (r *SPRenderer) smartLeftAngle(out *bytes.Buffer, previousChar byte, text [
 	return i
 }
 
-type smartCallback func(out *bytes.Buffer, previousChar byte, text []byte) int
+type smartCallback func(out *bytes.Buffer, smrt *smartypantsData, previousChar byte, text []byte) int
 
-// NewSmartypantsRenderer constructs a Smartypants renderer object.
-func NewSmartypantsRenderer(flags HTMLFlags) *SPRenderer {
-	var (
-		r SPRenderer
+type smartypantsRenderer [256]smartCallback
 
-		smartAmpAngled      = r.smartAmp(true, false)
-		smartAmpAngledNBSP  = r.smartAmp(true, true)
-		smartAmpRegular     = r.smartAmp(false, false)
-		smartAmpRegularNBSP = r.smartAmp(false, true)
-
-		addNBSP = flags&SmartypantsQuotesNBSP != 0
-	)
+var (
+	smartAmpAngled      = smartAmp(true, false)
+	smartAmpAngledNBSP  = smartAmp(true, true)
+	smartAmpRegular     = smartAmp(false, false)
+	smartAmpRegularNBSP = smartAmp(false, true)
+)
 
-	if flags&SmartypantsAngledQuotes == 0 {
-		r.callbacks['"'] = r.smartDoubleQuote
+func smartypants(flags int) *smartypantsRenderer {
+	r := new(smartypantsRenderer)
+	addNBSP := flags&HTML_SMARTYPANTS_QUOTES_NBSP != 0
+	if flags&HTML_SMARTYPANTS_ANGLED_QUOTES == 0 {
+		r['"'] = smartDoubleQuote
 		if !addNBSP {
-			r.callbacks['&'] = smartAmpRegular
+			r['&'] = smartAmpRegular
 		} else {
-			r.callbacks['&'] = smartAmpRegularNBSP
+			r['&'] = smartAmpRegularNBSP
 		}
 	} else {
-		r.callbacks['"'] = r.smartAngledDoubleQuote
+		r['"'] = smartAngledDoubleQuote
 		if !addNBSP {
-			r.callbacks['&'] = smartAmpAngled
+			r['&'] = smartAmpAngled
 		} else {
-			r.callbacks['&'] = smartAmpAngledNBSP
+			r['&'] = smartAmpAngledNBSP
 		}
 	}
-	r.callbacks['\''] = r.smartSingleQuote
-	r.callbacks['('] = r.smartParens
-	if flags&SmartypantsDashes != 0 {
-		if flags&SmartypantsLatexDashes == 0 {
-			r.callbacks['-'] = r.smartDash
+	r['\''] = smartSingleQuote
+	r['('] = smartParens
+	if flags&HTML_SMARTYPANTS_DASHES != 0 {
+		if flags&HTML_SMARTYPANTS_LATEX_DASHES == 0 {
+			r['-'] = smartDash
 		} else {
-			r.callbacks['-'] = r.smartDashLatex
+			r['-'] = smartDashLatex
 		}
 	}
-	r.callbacks['.'] = r.smartPeriod
-	if flags&SmartypantsFractions == 0 {
-		r.callbacks['1'] = r.smartNumber
-		r.callbacks['3'] = r.smartNumber
+	r['.'] = smartPeriod
+	if flags&HTML_SMARTYPANTS_FRACTIONS == 0 {
+		r['1'] = smartNumber
+		r['3'] = smartNumber
 	} else {
 		for ch := '1'; ch <= '9'; ch++ {
-			r.callbacks[ch] = r.smartNumberGeneric
+			r[ch] = smartNumberGeneric
 		}
 	}
-	r.callbacks['<'] = r.smartLeftAngle
-	r.callbacks['`'] = r.smartBacktick
-	return &r
-}
-
-// Process is the entry point of the Smartypants renderer.
-func (r *SPRenderer) Process(w io.Writer, text []byte) {
-	mark := 0
-	for i := 0; i < len(text); i++ {
-		if action := r.callbacks[text[i]]; action != nil {
-			if i > mark {
-				w.Write(text[mark:i])
-			}
-			previousChar := byte(0)
-			if i > 0 {
-				previousChar = text[i-1]
-			}
-			var tmp bytes.Buffer
-			i += action(&tmp, previousChar, text[i:])
-			w.Write(tmp.Bytes())
-			mark = i + 1
-		}
-	}
-	if mark < len(text) {
-		w.Write(text[mark:])
-	}
+	r['<'] = smartLeftAngle
+	r['`'] = smartBacktick
+	return r
 }
diff --git a/vendor/github.com/shurcooL/sanitized_anchor_name/.travis.yml b/vendor/github.com/shurcooL/sanitized_anchor_name/.travis.yml
deleted file mode 100644
index 93b1fcdb..00000000
--- a/vendor/github.com/shurcooL/sanitized_anchor_name/.travis.yml
+++ /dev/null
@@ -1,16 +0,0 @@
-sudo: false
-language: go
-go:
-  - 1.x
-  - master
-matrix:
-  allow_failures:
-    - go: master
-  fast_finish: true
-install:
-  - # Do nothing. This is needed to prevent default install action "go get -t -v ./..." from happening here (we want it to happen inside script step).
-script:
-  - go get -t -v ./...
-  - diff -u <(echo -n) <(gofmt -d -s .)
-  - go tool vet .
-  - go test -v -race ./...
diff --git a/vendor/github.com/shurcooL/sanitized_anchor_name/LICENSE b/vendor/github.com/shurcooL/sanitized_anchor_name/LICENSE
deleted file mode 100644
index c35c17af..00000000
--- a/vendor/github.com/shurcooL/sanitized_anchor_name/LICENSE
+++ /dev/null
@@ -1,21 +0,0 @@
-MIT License
-
-Copyright (c) 2015 Dmitri Shuralyov
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in all
-copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-SOFTWARE.
diff --git a/vendor/github.com/shurcooL/sanitized_anchor_name/README.md b/vendor/github.com/shurcooL/sanitized_anchor_name/README.md
deleted file mode 100644
index 670bf0fe..00000000
--- a/vendor/github.com/shurcooL/sanitized_anchor_name/README.md
+++ /dev/null
@@ -1,36 +0,0 @@
-sanitized_anchor_name
-=====================
-
-[![Build Status](https://travis-ci.org/shurcooL/sanitized_anchor_name.svg?branch=master)](https://travis-ci.org/shurcooL/sanitized_anchor_name) [![GoDoc](https://godoc.org/github.com/shurcooL/sanitized_anchor_name?status.svg)](https://godoc.org/github.com/shurcooL/sanitized_anchor_name)
-
-Package sanitized_anchor_name provides a func to create sanitized anchor names.
-
-Its logic can be reused by multiple packages to create interoperable anchor names
-and links to those anchors.
-
-At this time, it does not try to ensure that generated anchor names
-are unique, that responsibility falls on the caller.
-
-Installation
-------------
-
-```bash
-go get -u github.com/shurcooL/sanitized_anchor_name
-```
-
-Example
--------
-
-```Go
-anchorName := sanitized_anchor_name.Create("This is a header")
-
-fmt.Println(anchorName)
-
-// Output:
-// this-is-a-header
-```
-
-License
--------
-
--	[MIT License](LICENSE)
diff --git a/vendor/github.com/shurcooL/sanitized_anchor_name/go.mod b/vendor/github.com/shurcooL/sanitized_anchor_name/go.mod
deleted file mode 100644
index 1e255347..00000000
--- a/vendor/github.com/shurcooL/sanitized_anchor_name/go.mod
+++ /dev/null
@@ -1 +0,0 @@
-module github.com/shurcooL/sanitized_anchor_name
diff --git a/vendor/github.com/shurcooL/sanitized_anchor_name/main.go b/vendor/github.com/shurcooL/sanitized_anchor_name/main.go
deleted file mode 100644
index 6a77d124..00000000
--- a/vendor/github.com/shurcooL/sanitized_anchor_name/main.go
+++ /dev/null
@@ -1,29 +0,0 @@
-// Package sanitized_anchor_name provides a func to create sanitized anchor names.
-//
-// Its logic can be reused by multiple packages to create interoperable anchor names
-// and links to those anchors.
-//
-// At this time, it does not try to ensure that generated anchor names
-// are unique, that responsibility falls on the caller.
-package sanitized_anchor_name // import "github.com/shurcooL/sanitized_anchor_name"
-
-import "unicode"
-
-// Create returns a sanitized anchor name for the given text.
-func Create(text string) string {
-	var anchorName []rune
-	var futureDash = false
-	for _, r := range text {
-		switch {
-		case unicode.IsLetter(r) || unicode.IsNumber(r):
-			if futureDash && len(anchorName) > 0 {
-				anchorName = append(anchorName, '-')
-			}
-			futureDash = false
-			anchorName = append(anchorName, unicode.ToLower(r))
-		default:
-			futureDash = true
-		}
-	}
-	return string(anchorName)
-}
diff --git a/vendor/modules.txt b/vendor/modules.txt
index 1d75c351..692dde6f 100644
--- a/vendor/modules.txt
+++ b/vendor/modules.txt
@@ -145,7 +145,7 @@ github.com/pkg/errors
 github.com/pmezard/go-difflib/difflib
 # github.com/rs/xid v1.2.1
 github.com/rs/xid
-# github.com/russross/blackfriday v2.0.0+incompatible
+# github.com/russross/blackfriday v1.5.2
 github.com/russross/blackfriday
 # github.com/saintfish/chardet v0.0.0-20120816061221-3af4cd4741ca
 github.com/saintfish/chardet
@@ -154,8 +154,6 @@ github.com/shazow/rateio
 # github.com/shazow/ssh-chat v0.0.0-20190125184227-81d7e1686296
 github.com/shazow/ssh-chat/sshd
 github.com/shazow/ssh-chat/internal/sanitize
-# github.com/shurcooL/sanitized_anchor_name v1.0.0
-github.com/shurcooL/sanitized_anchor_name
 # github.com/sirupsen/logrus v1.3.0
 github.com/sirupsen/logrus
 # github.com/skip2/go-qrcode v0.0.0-20190110000554-dc11ecdae0a9