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
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
|
import logging
from ..common.utils import charCodeAt, isSpace, normalizeReference
from .state_block import StateBlock
LOGGER = logging.getLogger(__name__)
def reference(state: StateBlock, startLine, _endLine, silent):
LOGGER.debug(
"entering reference: %s, %s, %s, %s", state, startLine, _endLine, silent
)
lines = 0
pos = state.bMarks[startLine] + state.tShift[startLine]
maximum = 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.srcCharCode[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 < maximum:
# /* ] */ /* \ */ /* : */
if state.srcCharCode[pos] == 0x5D and state.srcCharCode[pos - 1] != 0x5C:
if pos + 1 == maximum:
return False
if state.srcCharCode[pos + 1] != 0x3A:
return False
break
pos += 1
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"
while nextLine < endLine and not state.isEmpty(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:
nextLine += 1
continue
# quirk for blockquotes, this line should already be checked by that rule
if state.sCount[nextLine] < 0:
nextLine += 1
continue
# Some tags can terminate paragraph without empty line.
terminate = False
for terminatorRule in terminatorRules:
if terminatorRule(state, nextLine, endLine, True):
terminate = True
break
if terminate:
break
nextLine += 1
string = state.getLines(startLine, nextLine, state.blkIndent, False).strip()
maximum = len(string)
labelEnd = None
pos = 1
while pos < maximum:
ch = charCodeAt(string, pos)
if ch == 0x5B: # /* [ */
return False
elif ch == 0x5D: # /* ] */
labelEnd = pos
break
elif ch == 0x0A: # /* \n */
lines += 1
elif ch == 0x5C: # /* \ */
pos += 1
if pos < maximum and charCodeAt(string, pos) == 0x0A:
lines += 1
pos += 1
if (
labelEnd is None or labelEnd < 0 or charCodeAt(string, labelEnd + 1) != 0x3A
): # /* : */
return False
# [label]: destination 'title'
# ^^^ skip optional whitespace here
pos = labelEnd + 2
while pos < maximum:
ch = charCodeAt(string, pos)
if ch == 0x0A:
lines += 1
elif isSpace(ch):
pass
else:
break
pos += 1
# [label]: destination 'title'
# ^^^^^^^^^^^ parse this
res = state.md.helpers.parseLinkDestination(string, pos, maximum)
if not res.ok:
return False
href = state.md.normalizeLink(res.str)
if not 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
while pos < maximum:
ch = charCodeAt(string, pos)
if ch == 0x0A:
lines += 1
elif isSpace(ch):
pass
else:
break
pos += 1
# [label]: destination 'title'
# ^^^^^^^ parse this
res = state.md.helpers.parseLinkTitle(string, pos, maximum)
if pos < maximum and start != pos and 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 < maximum:
ch = charCodeAt(string, pos)
if not isSpace(ch):
break
pos += 1
if pos < maximum and charCodeAt(string, 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 < maximum:
ch = charCodeAt(string, pos)
if not isSpace(ch):
break
pos += 1
if pos < maximum and charCodeAt(string, pos) != 0x0A:
# garbage at the end of the line
return False
label = normalizeReference(string[1:labelEnd])
if not label:
# CommonMark 0.20 disallows empty labels
return False
# Reference can not terminate anything. This check is for safety only.
if silent:
return True
if "references" not in state.env:
state.env["references"] = {}
state.line = startLine + lines + 1
# note, this is not part of markdown-it JS, but is useful for renderers
if state.md.options.get("inline_definitions", False):
token = state.push("definition", "", 0)
token.meta = {
"id": label,
"title": title,
"url": href,
"label": string[1:labelEnd],
}
token.map = [startLine, state.line]
if label not in state.env["references"]:
state.env["references"][label] = {
"title": title,
"href": href,
"map": [startLine, state.line],
}
else:
state.env.setdefault("duplicate_refs", []).append(
{
"title": title,
"href": href,
"label": label,
"map": [startLine, state.line],
}
)
state.parentType = oldParentType
return True
|
