1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
|
// Copyright 2015 The Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package markdown
import (
"bytes"
"unicode/utf8"
)
type ParserBlock struct{}
type BlockRule func(*StateBlock, int, int, bool) bool
var blockRules []BlockRule
var nl = []byte{'\n'}
func normalizeNewlines(src []byte) ([]byte, int) {
if bytes.IndexByte(src, '\r') == -1 {
return src, bytes.Count(src, nl)
}
n := 0
buf := make([]byte, 0, len(src))
for i := 0; i < len(src); i++ {
switch ch := src[i]; ch {
case '\n':
n++
buf = append(buf, '\n')
case '\r':
buf = append(buf, '\n')
n++
if i < len(src)-1 && src[i+1] == '\n' {
i++
}
default:
buf = append(buf, ch)
}
}
return buf, n
}
func (b ParserBlock) Parse(src []byte, md *Markdown, env *Environment) []Token {
src, n := normalizeNewlines(src)
if len(src) == 0 || src[len(src)-1] != '\n' {
n++
}
n++
indentFound := false
start := 0
indent := 0
offset := 0
mem := make([]int, 0, n*5)
bMarks := mem[0:0:n]
eMarks := mem[n : n : n*2]
tShift := mem[n*2 : n*2 : n*3]
sCount := mem[n*3 : n*3 : n*4]
bsCount := mem[n*4 : n*4 : n*5]
_, lastRuneLen := utf8.DecodeLastRune(src)
lastRunePos := len(src) - lastRuneLen
for pos, r := range string(src) {
if !indentFound {
if runeIsSpace(r) {
indent++
if r == '\t' {
offset += 4 - offset%4
} else {
offset++
}
continue
}
indentFound = true
}
if r == '\n' || pos == lastRunePos {
if r != '\n' {
pos = len(src)
}
bMarks = append(bMarks, start)
eMarks = append(eMarks, pos)
tShift = append(tShift, indent)
sCount = append(sCount, offset)
bsCount = append(bsCount, 0)
indentFound = false
indent = 0
offset = 0
start = pos + 1
}
}
bMarks = append(bMarks, len(src))
eMarks = append(eMarks, len(src))
tShift = append(tShift, 0)
sCount = append(sCount, 0)
bsCount = append(bsCount, 0)
var s StateBlock
s.BMarks = bMarks
s.EMarks = eMarks
s.TShift = tShift
s.SCount = sCount
s.BSCount = bsCount
s.LineMax = n - 1
s.Src = string(src)
s.Md = md
s.Env = env
b.Tokenize(&s, s.Line, s.LineMax)
return s.Tokens
}
func (ParserBlock) Tokenize(s *StateBlock, startLine, endLine int) {
line := startLine
hasEmptyLines := false
maxNesting := s.Md.MaxNesting
for line < endLine {
line = s.SkipEmptyLines(line)
s.Line = line
if line >= endLine {
break
}
if s.SCount[line] < s.BlkIndent {
break
}
if s.Level >= maxNesting {
s.Line = endLine
break
}
for _, r := range blockRules {
if r(s, line, endLine, false) {
break
}
}
s.Tight = !hasEmptyLines
if s.IsLineEmpty(s.Line - 1) {
hasEmptyLines = true
}
line = s.Line
if line < endLine && s.IsLineEmpty(line) {
hasEmptyLines = true
line++
s.Line = line
}
}
}
|
