/
stmd.js
1547 lines (1390 loc) · 45.8 KB
/
stmd.js
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
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
// stmd.js - CommonMark in javascript
// Copyright (C) 2014 John MacFarlane
// License: BSD3.
// Basic usage:
//
// var stmd = require('stmd');
// var parser = new stmd.DocParser();
// var renderer = new stmd.HtmlRenderer();
// console.log(renderer.render(parser.parse('Hello *world*')));
(function(exports) {
// Some regexps used in inline parser:
var ESCAPABLE = '[!"#$%&\'()*+,./:;<=>?@[\\\\\\]^_`{|}~-]';
var ESCAPED_CHAR = '\\\\' + ESCAPABLE;
var IN_DOUBLE_QUOTES = '"(' + ESCAPED_CHAR + '|[^"\\x00])*"';
var IN_SINGLE_QUOTES = '\'(' + ESCAPED_CHAR + '|[^\'\\x00])*\'';
var IN_PARENS = '\\((' + ESCAPED_CHAR + '|[^)\\x00])*\\)';
var REG_CHAR = '[^\\\\()\\x00-\\x20]';
var IN_PARENS_NOSP = '\\((' + REG_CHAR + '|' + ESCAPED_CHAR + ')*\\)';
var TAGNAME = '[A-Za-z][A-Za-z0-9]*';
var BLOCKTAGNAME = '(?:article|header|aside|hgroup|iframe|blockquote|hr|body|li|map|button|object|canvas|ol|caption|output|col|p|colgroup|pre|dd|progress|div|section|dl|table|td|dt|tbody|embed|textarea|fieldset|tfoot|figcaption|th|figure|thead|footer|footer|tr|form|ul|h1|h2|h3|h4|h5|h6|video|script|style)';
var ATTRIBUTENAME = '[a-zA-Z_:][a-zA-Z0-9:._-]*';
var UNQUOTEDVALUE = "[^\"'=<>`\\x00-\\x20]+";
var SINGLEQUOTEDVALUE = "'[^']*'";
var DOUBLEQUOTEDVALUE = '"[^"]*"';
var ATTRIBUTEVALUE = "(?:" + UNQUOTEDVALUE + "|" + SINGLEQUOTEDVALUE + "|" + DOUBLEQUOTEDVALUE + ")";
var ATTRIBUTEVALUESPEC = "(?:" + "\\s*=" + "\\s*" + ATTRIBUTEVALUE + ")";
var ATTRIBUTE = "(?:" + "\\s+" + ATTRIBUTENAME + ATTRIBUTEVALUESPEC + "?)";
var OPENTAG = "<" + TAGNAME + ATTRIBUTE + "*" + "\\s*/?>";
var CLOSETAG = "</" + TAGNAME + "\\s*[>]";
var OPENBLOCKTAG = "<" + BLOCKTAGNAME + ATTRIBUTE + "*" + "\\s*/?>";
var CLOSEBLOCKTAG = "</" + BLOCKTAGNAME + "\\s*[>]";
var HTMLCOMMENT = "<!--([^-]+|[-][^-]+)*-->";
var PROCESSINGINSTRUCTION = "[<][?].*?[?][>]";
var DECLARATION = "<![A-Z]+" + "\\s+[^>]*>";
var CDATA = "<!\\[CDATA\\[([^\\]]+|\\][^\\]]|\\]\\][^>])*\\]\\]>";
var HTMLTAG = "(?:" + OPENTAG + "|" + CLOSETAG + "|" + HTMLCOMMENT + "|" +
PROCESSINGINSTRUCTION + "|" + DECLARATION + "|" + CDATA + ")";
var HTMLBLOCKOPEN = "<(?:" + BLOCKTAGNAME + "[\\s/>]" + "|" +
"/" + BLOCKTAGNAME + "[\\s>]" + "|" + "[?!])";
var reHtmlTag = new RegExp('^' + HTMLTAG, 'i');
var reHtmlBlockOpen = new RegExp('^' + HTMLBLOCKOPEN, 'i');
var reLinkTitle = new RegExp(
'^(?:"(' + ESCAPED_CHAR + '|[^"\\x00])*"' +
'|' +
'\'(' + ESCAPED_CHAR + '|[^\'\\x00])*\'' +
'|' +
'\\((' + ESCAPED_CHAR + '|[^)\\x00])*\\))');
var reLinkDestinationBraces = new RegExp(
'^(?:[<](?:[^<>\\n\\\\\\x00]' + '|' + ESCAPED_CHAR + '|' + '\\\\)*[>])');
var reLinkDestination = new RegExp(
'^(?:' + REG_CHAR + '+|' + ESCAPED_CHAR + '|' + IN_PARENS_NOSP + ')*');
var reEscapable = new RegExp(ESCAPABLE);
var reAllEscapedChar = new RegExp('\\\\(' + ESCAPABLE + ')', 'g');
var reEscapedChar = new RegExp('^\\\\(' + ESCAPABLE + ')');
var reAllTab = /\t/g;
var reHrule = /^(?:(?:\* *){3,}|(?:_ *){3,}|(?:- *){3,}) *$/;
// Matches a character with a special meaning in markdown,
// or a string of non-special characters.
var reMain = /^(?:[\n`\[\]\\!<&*_]|[^\n`\[\]\\!<&*_]+)/m;
// UTILITY FUNCTIONS
// Replace backslash escapes with literal characters.
var unescape = function(s) {
return s.replace(reAllEscapedChar, '$1');
};
// Returns true if string contains only space characters.
var isBlank = function(s) {
return /^\s*$/.test(s);
};
// Normalize reference label: collapse internal whitespace
// to single space, remove leading/trailing whitespace, case fold.
var normalizeReference = function(s) {
return s.trim()
.replace(/\s+/,' ')
.toUpperCase();
};
// Attempt to match a regex in string s at offset offset.
// Return index of match or null.
var matchAt = function(re, s, offset) {
var res = s.slice(offset).match(re);
if (res) {
return offset + res.index;
} else {
return null;
}
};
// Convert tabs to spaces on each line using a 4-space tab stop.
var detabLine = function(text) {
if (text.indexOf('\t') == -1) {
return text;
} else {
var lastStop = 0;
return text.replace(reAllTab, function(match, offset) {
var result = ' '.slice((offset - lastStop) % 4);
lastStop = offset + 1;
return result;
});
}
};
// INLINE PARSER
// These are methods of an InlineParser object, defined below.
// An InlineParser keeps track of a subject (a string to be
// parsed) and a position in that subject.
// If re matches at current position in the subject, advance
// position in subject and return the match; otherwise return null.
var match = function(re) {
var match = re.exec(this.subject.slice(this.pos));
if (match) {
this.pos += match.index + match[0].length;
return match[0];
} else {
return null;
}
};
// Returns the character at the current subject position, or null if
// there are no more characters.
var peek = function() {
return this.subject.charAt(this.pos) || null;
};
// Parse zero or more space characters, including at most one newline
var spnl = function() {
this.match(/^ *(?:\n *)?/);
return 1;
};
// All of the parsers below try to match something at the current position
// in the subject. If they succeed in matching anything, they
// push an inline element onto the 'inlines' list. They return the
// number of characters parsed (possibly 0).
// Attempt to parse backticks, adding either a backtick code span or a
// literal sequence of backticks to the 'inlines' list.
var parseBackticks = function(inlines) {
var startpos = this.pos;
var ticks = this.match(/^`+/);
if (!ticks) {
return 0;
}
var afterOpenTicks = this.pos;
var foundCode = false;
var match;
while (!foundCode && (match = this.match(/`+/m))) {
if (match == ticks) {
inlines.push({ t: 'Code', c: this.subject.slice(afterOpenTicks,
this.pos - ticks.length)
.replace(/[ \n]+/g,' ')
.trim() });
return (this.pos - startpos);
}
}
// If we got here, we didn't match a closing backtick sequence.
inlines.push({ t: 'Str', c: ticks });
this.pos = afterOpenTicks;
return (this.pos - startpos);
};
// Parse a backslash-escaped special character, adding either the escaped
// character, a hard line break (if the backslash is followed by a newline),
// or a literal backslash to the 'inlines' list.
var parseEscaped = function(inlines) {
var subj = this.subject,
pos = this.pos;
if (subj.charAt(pos) === '\\') {
if (subj.charAt(pos + 1) === '\n') {
inlines.push({ t: 'Hardbreak' });
this.pos = this.pos + 2;
return 2;
} else if (reEscapable.test(subj.charAt(pos + 1))) {
inlines.push({ t: 'Str', c: subj.charAt(pos + 1) });
this.pos = this.pos + 2;
return 2;
} else {
this.pos++;
inlines.push({t: 'Str', c: '\\'});
return 1;
}
} else {
return 0;
}
};
// Attempt to parse an autolink (URL or email in pointy brackets).
var parseAutolink = function(inlines) {
var m;
var dest;
if ((m = this.match(/^<([a-zA-Z0-9.!#$%&'*+\/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*)>/))) { // email autolink
dest = m.slice(1,-1);
inlines.push({ t: 'Link', label: [{ t: 'Str', c: dest }],
destination: 'mailto:' + dest });
return m.length;
} else if ((m = this.match(/^<(?:coap|doi|javascript|aaa|aaas|about|acap|cap|cid|crid|data|dav|dict|dns|file|ftp|geo|go|gopher|h323|http|https|iax|icap|im|imap|info|ipp|iris|iris.beep|iris.xpc|iris.xpcs|iris.lwz|ldap|mailto|mid|msrp|msrps|mtqp|mupdate|news|nfs|ni|nih|nntp|opaquelocktoken|pop|pres|rtsp|service|session|shttp|sieve|sip|sips|sms|snmp|soap.beep|soap.beeps|tag|tel|telnet|tftp|thismessage|tn3270|tip|tv|urn|vemmi|ws|wss|xcon|xcon-userid|xmlrpc.beep|xmlrpc.beeps|xmpp|z39.50r|z39.50s|adiumxtra|afp|afs|aim|apt|attachment|aw|beshare|bitcoin|bolo|callto|chrome|chrome-extension|com-eventbrite-attendee|content|cvs|dlna-playsingle|dlna-playcontainer|dtn|dvb|ed2k|facetime|feed|finger|fish|gg|git|gizmoproject|gtalk|hcp|icon|ipn|irc|irc6|ircs|itms|jar|jms|keyparc|lastfm|ldaps|magnet|maps|market|message|mms|ms-help|msnim|mumble|mvn|notes|oid|palm|paparazzi|platform|proxy|psyc|query|res|resource|rmi|rsync|rtmp|secondlife|sftp|sgn|skype|smb|soldat|spotify|ssh|steam|svn|teamspeak|things|udp|unreal|ut2004|ventrilo|view-source|webcal|wtai|wyciwyg|xfire|xri|ymsgr):[^<>\x00-\x20]*>/i))) {
dest = m.slice(1,-1);
inlines.push({ t: 'Link', label: [{ t: 'Str', c: dest }],
destination: dest });
return m.length;
} else {
return 0;
}
};
// Attempt to parse a raw HTML tag.
var parseHtmlTag = function(inlines) {
var m = this.match(reHtmlTag);
if (m) {
inlines.push({ t: 'Html', c: m });
return m.length;
} else {
return 0;
}
};
// Scan a sequence of characters == c, and return information about
// the number of delimiters and whether they are positioned such that
// they can open and/or close emphasis or strong emphasis. A utility
// function for strong/emph parsing.
var scanDelims = function(c) {
var numdelims = 0;
var first_close_delims = 0;
var char_before, char_after;
var startpos = this.pos;
char_before = this.pos === 0 ? '\n' :
this.subject.charAt(this.pos - 1);
while (this.peek() === c) {
numdelims++;
this.pos++;
}
char_after = this.peek() || '\n';
var can_open = numdelims > 0 && numdelims <= 3 && !(/\s/.test(char_after));
var can_close = numdelims > 0 && numdelims <= 3 && !(/\s/.test(char_before));
if (c === '_') {
can_open = can_open && !((/[a-z0-9]/i).test(char_before));
can_close = can_close && !((/[a-z0-9]/i).test(char_after));
}
this.pos = startpos;
return { numdelims: numdelims,
can_open: can_open,
can_close: can_close };
};
// Attempt to parse emphasis or strong emphasis in an efficient way,
// with no backtracking.
var parseEmphasis = function(inlines) {
var startpos = this.pos;
var c ;
var first_close = 0;
var nxt = this.peek();
if (nxt == '*' || nxt == '_') {
c = nxt;
} else {
return 0;
}
var numdelims;
var delimpos;
// Get opening delimiters.
res = this.scanDelims(c);
numdelims = res.numdelims;
this.pos += numdelims;
// We provisionally add a literal string. If we match appropriate
// closing delimiters, we'll change this to Strong or Emph.
inlines.push({t: 'Str',
c: this.subject.substr(this.pos - numdelims, numdelims)});
// Record the position of this opening delimiter:
delimpos = inlines.length - 1;
if (!res.can_open || numdelims === 0) {
return 0;
}
var first_close_delims = 0;
switch (numdelims) {
case 1: // we started with * or _
while (true) {
res = this.scanDelims(c);
if (res.numdelims >= 1 && res.can_close) {
this.pos += 1;
// Convert the inline at delimpos, currently a string with the delim,
// into an Emph whose contents are the succeeding inlines
inlines[delimpos].t = 'Emph';
inlines[delimpos].c = inlines.slice(delimpos + 1);
inlines.splice(delimpos + 1, inlines.length - delimpos - 1);
break;
} else {
if (this.parseInline(inlines) === 0) {
break;
}
}
}
return (this.pos - startpos);
case 2: // We started with ** or __
while (true) {
res = this.scanDelims(c);
if (res.numdelims >= 2 && res.can_close) {
this.pos += 2;
inlines[delimpos].t = 'Strong';
inlines[delimpos].c = inlines.slice(delimpos + 1);
inlines.splice(delimpos + 1, inlines.length - delimpos - 1);
break;
} else {
if (this.parseInline(inlines) === 0) {
break;
}
}
}
return (this.pos - startpos);
case 3: // We started with *** or ___
while (true) {
res = this.scanDelims(c);
if (res.numdelims >= 1 && res.numdelims <= 3 && res.can_close &&
res.numdelims != first_close_delims) {
if (first_close_delims === 1 && numdelims > 2) {
res.numdelims = 2;
} else if (first_close_delims === 2) {
res.numdelims = 1;
} else if (res.numdelims === 3) {
// If we opened with ***, then we interpret *** as ** followed by *
// giving us <strong><em>
res.numdelims = 1;
}
this.pos += res.numdelims;
if (first_close > 0) { // if we've already passed the first closer:
inlines[delimpos].t = first_close_delims === 1 ? 'Strong' : 'Emph';
inlines[delimpos].c = [
{ t: first_close_delims === 1 ? 'Emph' : 'Strong',
c: inlines.slice(delimpos + 1, first_close)}
].concat(inlines.slice(first_close + 1));
inlines.splice(delimpos + 1);
break;
} else { // this is the first closer; for now, add literal string;
// we'll change this when he hit the second closer
inlines.push({t: 'Str',
c: this.subject.slice(this.pos - res.numdelims,
this.pos) });
first_close = inlines.length - 1;
first_close_delims = res.numdelims;
}
} else { // parse another inline element, til we hit the end
if (this.parseInline(inlines) === 0) {
break;
}
}
}
return (this.pos - startpos);
default:
return res;
}
return 0;
};
// Attempt to parse link title (sans quotes), returning the string
// or null if no match.
var parseLinkTitle = function() {
var title = this.match(reLinkTitle);
if (title) {
// chop off quotes from title and unescape:
return unescape(title.substr(1, title.length - 2));
} else {
return null;
}
};
// Attempt to parse link destination, returning the string or
// null if no match.
var parseLinkDestination = function() {
var res = this.match(reLinkDestinationBraces);
if (res) { // chop off surrounding <..>:
return unescape(res.substr(1, res.length - 2));
} else {
res = this.match(reLinkDestination);
if (res !== null) {
return unescape(res);
} else {
return null;
}
}
};
// Attempt to parse a link label, returning number of characters parsed.
var parseLinkLabel = function() {
if (this.peek() != '[') {
return 0;
}
var startpos = this.pos;
var nest_level = 0;
if (this.label_nest_level > 0) {
// If we've already checked to the end of this subject
// for a label, even with a different starting [, we
// know we won't find one here and we can just return.
// This avoids lots of backtracking.
// Note: nest level 1 would be: [foo [bar]
// nest level 2 would be: [foo [bar [baz]
this.label_nest_level--;
return 0;
}
this.pos++; // advance past [
var c;
while ((c = this.peek()) && (c != ']' || nest_level > 0)) {
switch (c) {
case '`':
this.parseBackticks([]);
break;
case '<':
this.parseAutolink([]) || this.parseHtmlTag([]) || this.parseString([]);
break;
case '[': // nested []
nest_level++;
this.pos++;
break;
case ']': // nested []
nest_level--;
this.pos++;
break;
case '\\':
this.parseEscaped([]);
break;
default:
this.parseString([]);
}
}
if (c === ']') {
this.label_nest_level = 0;
this.pos++; // advance past ]
return this.pos - startpos;
} else {
if (!c) {
this.label_nest_level = nest_level;
}
this.pos = startpos;
return 0;
}
};
// Parse raw link label, including surrounding [], and return
// inline contents. (Note: this is not a method of InlineParser.)
var parseRawLabel = function(s) {
// note: parse without a refmap; we don't want links to resolve
// in nested brackets!
return new InlineParser().parse(s.substr(1, s.length - 2), {});
};
// Attempt to parse a link. If successful, add the link to
// inlines.
var parseLink = function(inlines) {
var startpos = this.pos;
var reflabel;
var n;
var dest;
var title;
n = this.parseLinkLabel();
if (n === 0) {
return 0;
}
var afterlabel = this.pos;
var rawlabel = this.subject.substr(startpos, n);
// if we got this far, we've parsed a label.
// Try to parse an explicit link: [label](url "title")
if (this.peek() == '(') {
this.pos++;
if (this.spnl() &&
((dest = this.parseLinkDestination()) !== null) &&
this.spnl() &&
// make sure there's a space before the title:
(/^\s/.test(this.subject.charAt(this.pos - 1)) &&
(title = this.parseLinkTitle() || '') || true) &&
this.spnl() &&
this.match(/^\)/)) {
inlines.push({ t: 'Link',
destination: dest,
title: title,
label: parseRawLabel(rawlabel) });
return this.pos - startpos;
} else {
this.pos = startpos;
return 0;
}
}
// If we're here, it wasn't an explicit link. Try to parse a reference link.
// first, see if there's another label
var savepos = this.pos;
this.spnl();
var beforelabel = this.pos;
n = this.parseLinkLabel();
if (n == 2) {
// empty second label
reflabel = rawlabel;
} else if (n > 0) {
reflabel = this.subject.slice(beforelabel, beforelabel + n);
} else {
this.pos = savepos;
reflabel = rawlabel;
}
// lookup rawlabel in refmap
var link = this.refmap[normalizeReference(reflabel)];
if (link) {
inlines.push({t: 'Link',
destination: link.destination,
title: link.title,
label: parseRawLabel(rawlabel) });
return this.pos - startpos;
} else {
this.pos = startpos;
return 0;
}
// Nothing worked, rewind:
this.pos = startpos;
return 0;
};
// Attempt to parse an entity, adding to inlines if successful.
var parseEntity = function(inlines) {
var m;
if ((m = this.match(/^&(?:#x[a-f0-9]{1,8}|#[0-9]{1,8}|[a-z][a-z0-9]{1,31});/i))) {
inlines.push({ t: 'Entity', c: m });
return m.length;
} else {
return 0;
}
};
// Parse a run of ordinary characters, or a single character with
// a special meaning in markdown, as a plain string, adding to inlines.
var parseString = function(inlines) {
var m;
if ((m = this.match(reMain))) {
inlines.push({ t: 'Str', c: m });
return m.length;
} else {
return 0;
}
};
// Parse a newline. If it was preceded by two spaces, return a hard
// line break; otherwise a soft line break.
var parseNewline = function(inlines) {
if (this.peek() == '\n') {
this.pos++;
var last = inlines[inlines.length - 1];
if (last && last.t == 'Str' && last.c.slice(-2) == ' ') {
last.c = last.c.replace(/ *$/,'');
inlines.push({ t: 'Hardbreak' });
} else {
if (last && last.t == 'Str' && last.c.slice(-1) == ' ') {
last.c = last.c.slice(0, -1);
}
inlines.push({ t: 'Softbreak' });
}
return 1;
} else {
return 0;
}
};
// Attempt to parse an image. If the opening '!' is not followed
// by a link, add a literal '!' to inlines.
var parseImage = function(inlines) {
if (this.match(/^!/)) {
var n = this.parseLink(inlines);
if (n === 0) {
inlines.push({ t: 'Str', c: '!' });
return 1;
} else if (inlines[inlines.length - 1] &&
inlines[inlines.length - 1].t == 'Link') {
inlines[inlines.length - 1].t = 'Image';
return n+1;
} else {
throw "Shouldn't happen";
}
} else {
return 0;
}
};
// Attempt to parse a link reference, modifying refmap.
var parseReference = function(s, refmap) {
this.subject = s;
this.pos = 0;
var rawlabel;
var dest;
var title;
var matchChars;
var startpos = this.pos;
var match;
// label:
matchChars = this.parseLinkLabel();
if (matchChars === 0) {
return 0;
} else {
rawlabel = this.subject.substr(0, matchChars);
}
// colon:
if (this.peek() === ':') {
this.pos++;
} else {
this.pos = startpos;
return 0;
}
// link url
this.spnl();
dest = this.parseLinkDestination();
if (dest === null || dest.length === 0) {
this.pos = startpos;
return 0;
}
var beforetitle = this.pos;
this.spnl();
title = this.parseLinkTitle();
if (title === null) {
title = '';
// rewind before spaces
this.pos = beforetitle;
}
// make sure we're at line end:
if (this.match(/^ *(?:\n|$)/) === null) {
this.pos = startpos;
return 0;
}
var normlabel = normalizeReference(rawlabel);
if (!refmap[normlabel]) {
refmap[normlabel] = { destination: dest, title: title };
}
return this.pos - startpos;
};
// Parse the next inline element in subject, advancing subject position
// and adding the result to 'inlines'.
var parseInline = function(inlines) {
var c = this.peek();
var res;
switch(c) {
case '\n':
res = this.parseNewline(inlines);
break;
case '\\':
res = this.parseEscaped(inlines);
break;
case '`':
res = this.parseBackticks(inlines);
break;
case '*':
case '_':
res = this.parseEmphasis(inlines);
break;
case '[':
res = this.parseLink(inlines);
break;
case '!':
res = this.parseImage(inlines);
break;
case '<':
res = this.parseAutolink(inlines) ||
this.parseHtmlTag(inlines);
break;
case '&':
res = this.parseEntity(inlines);
break;
default:
}
return res || this.parseString(inlines);
};
// Parse s as a list of inlines, using refmap to resolve references.
var parseInlines = function(s, refmap) {
this.subject = s;
this.pos = 0;
this.refmap = refmap || {};
var inlines = [];
while (this.parseInline(inlines)) ;
return inlines;
};
// The InlineParser object.
function InlineParser(){
return {
subject: '',
label_nest_level: 0, // used by parseLinkLabel method
pos: 0,
refmap: {},
match: match,
peek: peek,
spnl: spnl,
parseBackticks: parseBackticks,
parseEscaped: parseEscaped,
parseAutolink: parseAutolink,
parseHtmlTag: parseHtmlTag,
scanDelims: scanDelims,
parseEmphasis: parseEmphasis,
parseLinkTitle: parseLinkTitle,
parseLinkDestination: parseLinkDestination,
parseLinkLabel: parseLinkLabel,
parseLink: parseLink,
parseEntity: parseEntity,
parseString: parseString,
parseNewline: parseNewline,
parseImage: parseImage,
parseReference: parseReference,
parseInline: parseInline,
parse: parseInlines
};
}
// DOC PARSER
// These are methods of a DocParser object, defined below.
var makeBlock = function(tag, start_line, start_column) {
return { t: tag,
open: true,
last_line_blank: false,
start_line: start_line,
start_column: start_column,
end_line: start_line,
children: [],
parent: null,
// string_content is formed by concatenating strings, in finalize:
string_content: "",
strings: [],
inline_content: []
};
};
// Returns true if parent block can contain child block.
var canContain = function(parent_type, child_type) {
return ( parent_type == 'Document' ||
parent_type == 'BlockQuote' ||
parent_type == 'ListItem' ||
(parent_type == 'List' && child_type == 'ListItem') );
};
// Returns true if block type can accept lines of text.
var acceptsLines = function(block_type) {
return ( block_type == 'Paragraph' ||
block_type == 'IndentedCode' ||
block_type == 'FencedCode' );
};
// Returns true if block ends with a blank line, descending if needed
// into lists and sublists.
var endsWithBlankLine = function(block) {
if (block.last_line_blank) {
return true;
}
if ((block.t == 'List' || block.t == 'ListItem') && block.children.length > 0) {
return endsWithBlankLine(block.children[block.children.length - 1]);
} else {
return false;
}
};
// Break out of all containing lists, resetting the tip of the
// document to the parent of the highest list, and finalizing
// all the lists. (This is used to implement the "two blank lines
// break of of all lists" feature.)
var breakOutOfLists = function(block, line_number) {
var b = block;
var last_list = null;
do {
if (b.t === 'List') {
last_list = b;
}
b = b.parent;
} while (b);
if (last_list) {
while (block != last_list) {
this.finalize(block, line_number);
block = block.parent;
}
this.finalize(last_list, line_number);
this.tip = last_list.parent;
}
};
// Add a line to the block at the tip. We assume the tip
// can accept lines -- that check should be done before calling this.
var addLine = function(ln, offset) {
var s = ln.slice(offset);
if (!(this.tip.open)) {
throw({ msg: "Attempted to add line (" + ln + ") to closed container." });
}
this.tip.strings.push(s);
};
// Add block of type tag as a child of the tip. If the tip can't
// accept children, close and finalize it and try its parent,
// and so on til we find a block that can accept children.
var addChild = function(tag, line_number, offset) {
while (!canContain(this.tip.t, tag)) {
this.finalize(this.tip, line_number);
}
var column_number = offset + 1; // offset 0 = column 1
var newBlock = makeBlock(tag, line_number, column_number);
this.tip.children.push(newBlock);
newBlock.parent = this.tip;
this.tip = newBlock;
return newBlock;
};
// Parse a list marker and return data on the marker (type,
// start, delimiter, bullet character, padding) or null.
var parseListMarker = function(ln, offset) {
var rest = ln.slice(offset);
var match;
var spaces_after_marker;
var data = {};
if (rest.match(reHrule)) {
return null;
}
if ((match = rest.match(/^[*+-]( +|$)/))) {
spaces_after_marker = match[1].length;
data.type = 'Bullet';
data.bullet_char = match[0].charAt(0);
} else if ((match = rest.match(/^(\d+)([.)])( +|$)/))) {
spaces_after_marker = match[3].length;
data.type = 'Ordered';
data.start = parseInt(match[1]);
data.delimiter = match[2];
} else {
return null;
}
var blank_item = match[0].length === rest.length;
if (spaces_after_marker >= 5 ||
spaces_after_marker < 1 ||
blank_item) {
data.padding = match[0].length - spaces_after_marker + 1;
} else {
data.padding = match[0].length;
}
return data;
};
// Returns true if the two list items are of the same type,
// with the same delimiter and bullet character. This is used
// in agglomerating list items into lists.
var listsMatch = function(list_data, item_data) {
return (list_data.type === item_data.type &&
list_data.delimiter === item_data.delimiter &&
list_data.bullet_char === item_data.bullet_char);
};
// Analyze a line of text and update the document appropriately.
// We parse markdown text by calling this on each line of input,
// then finalizing the document.
var incorporateLine = function(ln, line_number) {
var all_matched = true;
var last_child;
var first_nonspace;
var offset = 0;
var match;
var data;
var blank;
var indent;
var last_matched_container;
var i;
var CODE_INDENT = 4;
var container = this.doc;
var oldtip = this.tip;
// Convert tabs to spaces:
ln = detabLine(ln);
// For each containing block, try to parse the associated line start.
// Bail out on failure: container will point to the last matching block.
// Set all_matched to false if not all containers match.
while (container.children.length > 0) {
last_child = container.children[container.children.length - 1];
if (!last_child.open) {
break;
}
container = last_child;
match = matchAt(/[^ ]/, ln, offset);
if (match === null) {
first_nonspace = ln.length;
blank = true;
} else {
first_nonspace = match;
blank = false;
}
indent = first_nonspace - offset;
switch (container.t) {
case 'BlockQuote':
var matched = indent <= 3 && ln.charAt(first_nonspace) === '>';
if (matched) {
offset = first_nonspace + 1;
if (ln.charAt(offset) === ' ') {
offset++;
}
} else {
all_matched = false;
}
break;
case 'ListItem':
if (indent >= container.list_data.marker_offset +
container.list_data.padding) {
offset += container.list_data.marker_offset +
container.list_data.padding;
} else if (blank) {
offset = first_nonspace;
} else {
all_matched = false;
}
break;
case 'IndentedCode':
if (indent >= CODE_INDENT) {
offset += CODE_INDENT;
} else if (blank) {
offset = first_nonspace;
} else {
all_matched = false;
}
break;
case 'ATXHeader':
case 'SetextHeader':
case 'HorizontalRule':
// a header can never container > 1 line, so fail to match:
all_matched = false;
break;
case 'FencedCode':
// skip optional spaces of fence offset
i = container.fence_offset;
while (i > 0 && ln.charAt(offset) === ' ') {
offset++;
i--;
}
break;
case 'HtmlBlock':
if (blank) {
all_matched = false;
}
break;
case 'Paragraph':
if (blank) {
container.last_line_blank = true;
all_matched = false;
}
break;
default:
}
if (!all_matched) {