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
185
186
187
188
189
190
191
192
193
194
195
196
197
198
|
'use strict';
var normalizeReference = require('../common/utils').normalizeReference;
var isSpace = require('../common/utils').isSpace;
module.exports = function reference(state, startLine, _endLine, silent) {
var ch,
destEndPos,
destEndLineNo,
endLine,
href,
i,
l,
label,
labelEnd,
oldParentType,
res,
start,
str,
terminate,
terminatorRules,
title,
lines = 0,
pos = state.bMarks[startLine] + state.tShift[startLine],
max = state.eMarks[startLine],
nextLine = startLine + 1;
// if it's indented more than 3 spaces, it should be a code block
if (state.sCount[startLine] - state.blkIndent >= 4) { return false; }
if (state.src.charCodeAt(pos) !== 0x5B/* [ */) { return false; }
// Simple check to quickly interrupt scan on [link](url) at the start of line.
// Can be useful on practice: https://github.com/markdown-it/markdown-it/issues/54
while (++pos < max) {
if (state.src.charCodeAt(pos) === 0x5D /* ] */ &&
state.src.charCodeAt(pos - 1) !== 0x5C/* \ */) {
if (pos + 1 === max) { return false; }
if (state.src.charCodeAt(pos + 1) !== 0x3A/* : */) { return false; }
break;
}
}
endLine = state.lineMax;
// jump line-by-line until empty one or EOF
terminatorRules = state.md.block.ruler.getRules('reference');
oldParentType = state.parentType;
state.parentType = 'reference';
for (; nextLine < endLine && !state.isEmpty(nextLine); nextLine++) {
// this would be a code block normally, but after paragraph
// it's considered a lazy continuation regardless of what's there
if (state.sCount[nextLine] - state.blkIndent > 3) { continue; }
// quirk for blockquotes, this line should already be checked by that rule
if (state.sCount[nextLine] < 0) { continue; }
// Some tags can terminate paragraph without empty line.
terminate = false;
for (i = 0, l = terminatorRules.length; i < l; i++) {
if (terminatorRules[i](state, nextLine, endLine, true)) {
terminate = true;
break;
}
}
if (terminate) { break; }
}
str = state.getLines(startLine, nextLine, state.blkIndent, false).trim();
max = str.length;
for (pos = 1; pos < max; pos++) {
ch = str.charCodeAt(pos);
if (ch === 0x5B /* [ */) {
return false;
} else if (ch === 0x5D /* ] */) {
labelEnd = pos;
break;
} else if (ch === 0x0A /* \n */) {
lines++;
} else if (ch === 0x5C /* \ */) {
pos++;
if (pos < max && str.charCodeAt(pos) === 0x0A) {
lines++;
}
}
}
if (labelEnd < 0 || str.charCodeAt(labelEnd + 1) !== 0x3A/* : */) { return false; }
// [label]: destination 'title'
// ^^^ skip optional whitespace here
for (pos = labelEnd + 2; pos < max; pos++) {
ch = str.charCodeAt(pos);
if (ch === 0x0A) {
lines++;
} else if (isSpace(ch)) {
/*eslint no-empty:0*/
} else {
break;
}
}
// [label]: destination 'title'
// ^^^^^^^^^^^ parse this
res = state.md.helpers.parseLinkDestination(str, pos, max);
if (!res.ok) { return false; }
href = state.md.normalizeLink(res.str);
if (!state.md.validateLink(href)) { return false; }
pos = res.pos;
lines += res.lines;
// save cursor state, we could require to rollback later
destEndPos = pos;
destEndLineNo = lines;
// [label]: destination 'title'
// ^^^ skipping those spaces
start = pos;
for (; pos < max; pos++) {
ch = str.charCodeAt(pos);
if (ch === 0x0A) {
lines++;
} else if (isSpace(ch)) {
/*eslint no-empty:0*/
} else {
break;
}
}
// [label]: destination 'title'
// ^^^^^^^ parse this
res = state.md.helpers.parseLinkTitle(str, pos, max);
if (pos < max && start !== pos && res.ok) {
title = res.str;
pos = res.pos;
lines += res.lines;
} else {
title = '';
pos = destEndPos;
lines = destEndLineNo;
}
// skip trailing spaces until the rest of the line
while (pos < max) {
ch = str.charCodeAt(pos);
if (!isSpace(ch)) { break; }
pos++;
}
if (pos < max && str.charCodeAt(pos) !== 0x0A) {
if (title) {
// garbage at the end of the line after title,
// but it could still be a valid reference if we roll back
title = '';
pos = destEndPos;
lines = destEndLineNo;
while (pos < max) {
ch = str.charCodeAt(pos);
if (!isSpace(ch)) { break; }
pos++;
}
}
}
if (pos < max && str.charCodeAt(pos) !== 0x0A) {
// garbage at the end of the line
return false;
}
label = normalizeReference(str.slice(1, labelEnd));
if (!label) {
// CommonMark 0.20 disallows empty labels
return false;
}
// Reference can not terminate anything. This check is for safety only.
/*istanbul ignore if*/
if (silent) { return true; }
if (typeof state.env.references === 'undefined') {
state.env.references = {};
}
if (typeof state.env.references[label] === 'undefined') {
state.env.references[label] = { title: title, href: href };
}
state.parentType = oldParentType;
state.line = startLine + lines + 1;
return true;
};
|
