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
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
|
// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
// See LICENSE.txt for license information.
package markdown
import (
"unicode/utf8"
)
func parseLinkDestination(markdown string, position int) (raw Range, next int, ok bool) {
if position >= len(markdown) {
return
}
if markdown[position] == '<' {
isEscaped := false
for offset, c := range []byte(markdown[position+1:]) {
if isEscaped {
isEscaped = false
if isEscapableByte(c) {
continue
}
}
if c == '\\' {
isEscaped = true
} else if c == '<' {
break
} else if c == '>' {
return Range{position + 1, position + 1 + offset}, position + 1 + offset + 1, true
} else if isWhitespaceByte(c) {
break
}
}
}
openCount := 0
isEscaped := false
for offset, c := range []byte(markdown[position:]) {
if isEscaped {
isEscaped = false
if isEscapableByte(c) {
continue
}
}
switch c {
case '\\':
isEscaped = true
case '(':
openCount++
case ')':
if openCount < 1 {
return Range{position, position + offset}, position + offset, true
}
openCount--
default:
if isWhitespaceByte(c) {
return Range{position, position + offset}, position + offset, true
}
}
}
return Range{position, len(markdown)}, len(markdown), true
}
func parseLinkTitle(markdown string, position int) (raw Range, next int, ok bool) {
if position >= len(markdown) {
return
}
originalPosition := position
var closer byte
switch markdown[position] {
case '"', '\'':
closer = markdown[position]
case '(':
closer = ')'
default:
return
}
position++
for position < len(markdown) {
switch markdown[position] {
case '\\':
position++
if position < len(markdown) && isEscapableByte(markdown[position]) {
position++
}
case closer:
return Range{originalPosition + 1, position}, position + 1, true
default:
position++
}
}
return
}
func parseLinkLabel(markdown string, position int) (raw Range, next int, ok bool) {
if position >= len(markdown) || markdown[position] != '[' {
return
}
originalPosition := position
position++
for position < len(markdown) {
switch markdown[position] {
case '\\':
position++
if position < len(markdown) && isEscapableByte(markdown[position]) {
position++
}
case '[':
return
case ']':
if position-originalPosition >= 1000 && utf8.RuneCountInString(markdown[originalPosition:position]) >= 1000 {
return
}
return Range{originalPosition + 1, position}, position + 1, true
default:
position++
}
}
return
}
// As a non-standard feature, we allow image links to specify dimensions of the image by adding "=WIDTHxHEIGHT"
// after the image destination but before the image title like .
// Both width and height are optional, but at least one of them must be specified.
func parseImageDimensions(markdown string, position int) (raw Range, next int, ok bool) {
if position >= len(markdown) {
return
}
originalPosition := position
// Read =
position += 1
if position >= len(markdown) {
return
}
// Read width
hasWidth := false
for position < len(markdown)-1 && isNumericByte(markdown[position]) {
hasWidth = true
position += 1
}
// Look for early end of dimensions
if isWhitespaceByte(markdown[position]) || markdown[position] == ')' {
return Range{originalPosition, position - 1}, position, true
}
// Read the x
if (markdown[position] != 'x' && markdown[position] != 'X') || position == len(markdown)-1 {
return
}
position += 1
// Read height
hasHeight := false
for position < len(markdown)-1 && isNumericByte(markdown[position]) {
hasHeight = true
position += 1
}
// Make sure the there's no trailing characters
if !isWhitespaceByte(markdown[position]) && markdown[position] != ')' {
return
}
if !hasWidth && !hasHeight {
// At least one of width or height is required
return
}
return Range{originalPosition, position - 1}, position, true
}
|
