summaryrefslogtreecommitdiff
path: root/man/man3/cmark.3
blob: 6edac7bea9afb841d2d03a5ac71c5a1c1fc31ebb (plain)
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
.TH cmark 3 "June 25, 2015" "LOCAL" "Library Functions Manual"
.SH
NAME
.PP
\f[B]cmark\f[] \- CommonMark parsing, manipulating, and rendering

.SH
DESCRIPTION
.SS
Simple Interface

.PP
\fIchar *\f[] \fBcmark_markdown_to_html\f[](\fIconst char *text\f[], \fIsize_t len\f[], \fIint options\f[])

.PP
Convert \f[I]text\f[] (assumed to be a UTF\-8 encoded string with length
\f[I]len\f[] from CommonMark Markdown to HTML, returning a null\-terminated,
UTF\-8\-encoded string.

.SS
Node Structure

.SS
Creating and Destroying Nodes

.PP
\fIcmark_node*\f[] \fBcmark_node_new\f[](\fIcmark_node_type type\f[])

.PP
Creates a new node of type \f[I]type\f[]\&.  Note that the node may have
other required properties, which it is the caller's responsibility
to assign.

.PP
\fIvoid\f[] \fBcmark_node_free\f[](\fIcmark_node *node\f[])

.PP
Frees the memory allocated for a node.

.SS
Tree Traversal

.PP
\fIcmark_node*\f[] \fBcmark_node_next\f[](\fIcmark_node *node\f[])

.PP
Returns the next node in the sequence after \f[I]node\f[], or NULL if
there is none.

.PP
\fIcmark_node*\f[] \fBcmark_node_previous\f[](\fIcmark_node *node\f[])

.PP
Returns the previous node in the sequence after \f[I]node\f[], or NULL if
there is none.

.PP
\fIcmark_node*\f[] \fBcmark_node_parent\f[](\fIcmark_node *node\f[])

.PP
Returns the parent of \f[I]node\f[], or NULL if there is none.

.PP
\fIcmark_node*\f[] \fBcmark_node_first_child\f[](\fIcmark_node *node\f[])

.PP
Returns the first child of \f[I]node\f[], or NULL if \f[I]node\f[] has no children.

.PP
\fIcmark_node*\f[] \fBcmark_node_last_child\f[](\fIcmark_node *node\f[])

.PP
Returns the last child of \f[I]node\f[], or NULL if \f[I]node\f[] has no children.

.SS
Iterator
.PP
An iterator will walk through a tree of nodes, starting from a root
node, returning one node at a time, together with information about
whether the node is being entered or exited.  The iterator will
first descend to a child node, if there is one.  When there is no
child, the iterator will go to the next sibling.  When there is no
next sibling, the iterator will return to the parent (but with
a \f[I]cmark_event_type\f[] of \f[C]CMARK_EVENT_EXIT\f[]).  The iterator will
return \f[C]CMARK_EVENT_DONE\f[] when it reaches the root node again.
One natural application is an HTML renderer, where an \f[C]ENTER\f[] event
outputs an open tag and an \f[C]EXIT\f[] event outputs a close tag.
An iterator might also be used to transform an AST in some systematic
way, for example, turning all level\-3 headers into regular paragraphs.
.IP
.nf
\f[C]
void
usage_example(cmark_node *root) {
    cmark_event_type ev_type;
    cmark_iter *iter = cmark_iter_new(root);

    while ((ev_type = cmark_iter_next(iter)) != CMARK_EVENT_DONE) {
        cmark_node *cur = cmark_iter_get_node(iter);
        // Do something with `cur` and `ev_type`
    }

    cmark_iter_free(iter);
}
\f[]
.fi
.PP
Iterators will never return \f[C]EXIT\f[] events for leaf nodes, which are nodes
of type:
.IP \[bu] 2
CMARK_NODE_HTML
.IP \[bu] 2
CMARK_NODE_HRULE
.IP \[bu] 2
CMARK_NODE_CODE_BLOCK
.IP \[bu] 2
CMARK_NODE_TEXT
.IP \[bu] 2
CMARK_NODE_SOFTBREAK
.IP \[bu] 2
CMARK_NODE_LINEBREAK
.IP \[bu] 2
CMARK_NODE_CODE
.IP \[bu] 2
CMARK_NODE_INLINE_HTML
.PP
Nodes must only be modified after an \f[C]EXIT\f[] event, or an \f[C]ENTER\f[] event for
leaf nodes.

.PP
\fIcmark_iter*\f[] \fBcmark_iter_new\f[](\fIcmark_node *root\f[])

.PP
Creates a new iterator starting at \f[I]root\f[]\&.  The current node and event
type are undefined until \f[C]cmark_iter_next\f[] is called for the first time.

.PP
\fIvoid\f[] \fBcmark_iter_free\f[](\fIcmark_iter *iter\f[])

.PP
Frees the memory allocated for an iterator.

.PP
\fIcmark_event_type\f[] \fBcmark_iter_next\f[](\fIcmark_iter *iter\f[])

.PP
Advances to the next node and returns the event type (\f[C]CMARK_EVENT_ENTER\f[],
\f[C]CMARK_EVENT_EXIT\f[] or \f[C]CMARK_EVENT_DONE\f[]).

.PP
\fIcmark_node*\f[] \fBcmark_iter_get_node\f[](\fIcmark_iter *iter\f[])

.PP
Returns the current node.

.PP
\fIcmark_event_type\f[] \fBcmark_iter_get_event_type\f[](\fIcmark_iter *iter\f[])

.PP
Returns the current event type.

.PP
\fIcmark_node*\f[] \fBcmark_iter_get_root\f[](\fIcmark_iter *iter\f[])

.PP
Returns the root node.

.PP
\fIvoid\f[] \fBcmark_iter_reset\f[](\fIcmark_iter *iter\f[], \fIcmark_node *current\f[], \fIcmark_event_type event_type\f[])

.PP
Resets the iterator so that the current node is \f[I]current\f[] and
the event type is \f[I]event_type\f[]\&.  The new current node must be a
descendant of the root node or the root node itself.

.SS
Accessors

.PP
\fIvoid*\f[] \fBcmark_node_get_user_data\f[](\fIcmark_node *node\f[])

.PP
Returns the user data of \f[I]node\f[]\&.

.PP
\fIint\f[] \fBcmark_node_set_user_data\f[](\fIcmark_node *node\f[], \fIvoid *user_data\f[])

.PP
Sets arbitrary user data for \f[I]node\f[]\&.  Returns 1 on success,
0 on failure.

.PP
\fIcmark_node_type\f[] \fBcmark_node_get_type\f[](\fIcmark_node *node\f[])

.PP
Returns the type of \f[I]node\f[], or \f[C]CMARK_NODE_NONE\f[] on error.

.PP
\fIconst char*\f[] \fBcmark_node_get_type_string\f[](\fIcmark_node *node\f[])

.PP
Like \f[I]cmark_node_get_type\f[], but returns a string representation
of the type, or \f[C]"<unknown>"\f[]\&.

.PP
\fIconst char*\f[] \fBcmark_node_get_literal\f[](\fIcmark_node *node\f[])

.PP
Returns the string contents of \f[I]node\f[], or NULL if none.

.PP
\fIint\f[] \fBcmark_node_set_literal\f[](\fIcmark_node *node\f[], \fIconst char *content\f[])

.PP
Sets the string contents of \f[I]node\f[]\&.  Returns 1 on success,
0 on failure.

.PP
\fIint\f[] \fBcmark_node_get_header_level\f[](\fIcmark_node *node\f[])

.PP
Returns the header level of \f[I]node\f[], or 0 if \f[I]node\f[] is not a header.

.PP
\fIint\f[] \fBcmark_node_set_header_level\f[](\fIcmark_node *node\f[], \fIint level\f[])

.PP
Sets the header level of \f[I]node\f[], returning 1 on success and 0 on error.

.PP
\fIcmark_list_type\f[] \fBcmark_node_get_list_type\f[](\fIcmark_node *node\f[])

.PP
Returns the list type of \f[I]node\f[], or \f[C]CMARK_NO_LIST\f[] if \f[I]node\f[]
is not a list.

.PP
\fIint\f[] \fBcmark_node_set_list_type\f[](\fIcmark_node *node\f[], \fIcmark_list_type type\f[])

.PP
Sets the list type of \f[I]node\f[], returning 1 on success and 0 on error.

.PP
\fIcmark_delim_type\f[] \fBcmark_node_get_list_delim\f[](\fIcmark_node *node\f[])

.PP
Returns the list delimiter type of \f[I]node\f[], or \f[C]CMARK_NO_DELIM\f[] if \f[I]node\f[]
is not a list.

.PP
\fIint\f[] \fBcmark_node_set_list_delim\f[](\fIcmark_node *node\f[], \fIcmark_delim_type delim\f[])

.PP
Sets the list delimiter type of \f[I]node\f[], returning 1 on success and 0
on error.

.PP
\fIint\f[] \fBcmark_node_get_list_start\f[](\fIcmark_node *node\f[])

.PP
Returns starting number of \f[I]node\f[], if it is an ordered list, otherwise 0.

.PP
\fIint\f[] \fBcmark_node_set_list_start\f[](\fIcmark_node *node\f[], \fIint start\f[])

.PP
Sets starting number of \f[I]node\f[], if it is an ordered list. Returns 1
on success, 0 on failure.

.PP
\fIint\f[] \fBcmark_node_get_list_tight\f[](\fIcmark_node *node\f[])

.PP
Returns 1 if \f[I]node\f[] is a tight list, 0 otherwise.

.PP
\fIint\f[] \fBcmark_node_set_list_tight\f[](\fIcmark_node *node\f[], \fIint tight\f[])

.PP
Sets the "tightness" of a list.  Returns 1 on success, 0 on failure.

.PP
\fIconst char*\f[] \fBcmark_node_get_fence_info\f[](\fIcmark_node *node\f[])

.PP
Returns the info string from a fenced code block, or NULL if none.

.PP
\fIint\f[] \fBcmark_node_set_fence_info\f[](\fIcmark_node *node\f[], \fIconst char *info\f[])

.PP
Sets the info string in a fenced code block, returning 1 on
success and 0 on failure.

.PP
\fIconst char*\f[] \fBcmark_node_get_url\f[](\fIcmark_node *node\f[])

.PP
Gets the URL of a link or image \f[I]node\f[], or NULL if none.

.PP
\fIint\f[] \fBcmark_node_set_url\f[](\fIcmark_node *node\f[], \fIconst char *url\f[])

.PP
Sets the URL of a link or image \f[I]node\f[]\&. Returns 1 on success,
0 on failure.

.PP
\fIconst char*\f[] \fBcmark_node_get_title\f[](\fIcmark_node *node\f[])

.PP
Gets the title of a link or image \f[I]node\f[], or NULL if none.

.PP
\fIint\f[] \fBcmark_node_set_title\f[](\fIcmark_node *node\f[], \fIconst char *title\f[])

.PP
Sets the title of a link or image \f[I]node\f[]\&. Returns 1 on success,
0 on failure.

.PP
\fIint\f[] \fBcmark_node_get_start_line\f[](\fIcmark_node *node\f[])

.PP
Returns the line on which \f[I]node\f[] begins.

.PP
\fIint\f[] \fBcmark_node_get_start_column\f[](\fIcmark_node *node\f[])

.PP
Returns the column at which \f[I]node\f[] begins.

.PP
\fIint\f[] \fBcmark_node_get_end_line\f[](\fIcmark_node *node\f[])

.PP
Returns the line on which \f[I]node\f[] ends.

.PP
\fIint\f[] \fBcmark_node_get_end_column\f[](\fIcmark_node *node\f[])

.PP
Returns the column at which \f[I]node\f[] ends.

.SS
Tree Manipulation

.PP
\fIvoid\f[] \fBcmark_node_unlink\f[](\fIcmark_node *node\f[])

.PP
Unlinks a \f[I]node\f[], removing it from the tree, but not freeing its
memory.  (Use \f[I]cmark_node_free\f[] for that.)

.PP
\fIint\f[] \fBcmark_node_insert_before\f[](\fIcmark_node *node\f[], \fIcmark_node *sibling\f[])

.PP
Inserts \f[I]sibling\f[] before \f[I]node\f[]\&.  Returns 1 on success, 0 on failure.

.PP
\fIint\f[] \fBcmark_node_insert_after\f[](\fIcmark_node *node\f[], \fIcmark_node *sibling\f[])

.PP
Inserts \f[I]sibling\f[] after \f[I]node\f[]\&. Returns 1 on success, 0 on failure.

.PP
\fIint\f[] \fBcmark_node_prepend_child\f[](\fIcmark_node *node\f[], \fIcmark_node *child\f[])

.PP
Adds \f[I]child\f[] to the beginning of the children of \f[I]node\f[]\&.
Returns 1 on success, 0 on failure.

.PP
\fIint\f[] \fBcmark_node_append_child\f[](\fIcmark_node *node\f[], \fIcmark_node *child\f[])

.PP
Adds \f[I]child\f[] to the end of the children of \f[I]node\f[]\&.
Returns 1 on success, 0 on failure.

.PP
\fIvoid\f[] \fBcmark_consolidate_text_nodes\f[](\fIcmark_node *root\f[])

.PP
Consolidates adjacent text nodes.

.SS
Parsing
.PP
Simple interface:
.IP
.nf
\f[C]
cmark_node *document = cmark_parse_document("Hello *world*", 12,
                                            CMARK_OPT_DEFAULT);
\f[]
.fi
.PP
Streaming interface:
.IP
.nf
\f[C]
cmark_parser *parser = cmark_parser_new(CMARK_OPT_DEFAULT);
FILE *fp = fopen("myfile.md", "r");
while ((bytes = fread(buffer, 1, sizeof(buffer), fp)) > 0) {
	   cmark_parser_feed(parser, buffer, bytes);
	   if (bytes < sizeof(buffer)) {
	       break;
	   }
}
document = cmark_parser_finish(parser);
cmark_parser_free(parser);
\f[]
.fi

.PP
\fIcmark_parser *\f[] \fBcmark_parser_new\f[](\fIint options\f[])

.PP
Creates a new parser object.

.PP
\fIvoid\f[] \fBcmark_parser_free\f[](\fIcmark_parser *parser\f[])

.PP
Frees memory allocated for a parser object.

.PP
\fIvoid\f[] \fBcmark_parser_feed\f[](\fIcmark_parser *parser\f[], \fIconst char *buffer\f[], \fIsize_t len\f[])

.PP
Feeds a string of length \f[I]len\f[] to \f[I]parser\f[]\&.

.PP
\fIcmark_node *\f[] \fBcmark_parser_finish\f[](\fIcmark_parser *parser\f[])

.PP
Finish parsing and return a pointer to a tree of nodes.

.PP
\fIcmark_node *\f[] \fBcmark_parse_document\f[](\fIconst char *buffer\f[], \fIsize_t len\f[], \fIint options\f[])

.PP
Parse a CommonMark document in \f[I]buffer\f[] of length \f[I]len\f[]\&.
Returns a pointer to a tree of nodes.

.PP
\fIcmark_node *\f[] \fBcmark_parse_file\f[](\fIFILE *f\f[], \fIint options\f[])

.PP
Parse a CommonMark document in file \f[I]f\f[], returning a pointer to
a tree of nodes.

.SS
Rendering

.PP
\fIchar *\f[] \fBcmark_render_xml\f[](\fIcmark_node *root\f[], \fIint options\f[])

.PP
Render a \f[I]node\f[] tree as XML.

.PP
\fIchar *\f[] \fBcmark_render_html\f[](\fIcmark_node *root\f[], \fIint options\f[])

.PP
Render a \f[I]node\f[] tree as an HTML fragment.  It is up to the user
to add an appropriate header and footer.

.PP
\fIchar *\f[] \fBcmark_render_man\f[](\fIcmark_node *root\f[], \fIint options\f[])

.PP
Render a \f[I]node\f[] tree as a groff man page, without the header.

.PP
\fIchar *\f[] \fBcmark_render_commonmark\f[](\fIcmark_node *root\f[], \fIint options\f[], \fIint width\f[])

.PP
Render a \f[I]node\f[] tree as a commonmark document.

.PP
.nf
\fC
.RS 0n
#define CMARK_OPT_DEFAULT 0
.RE
\f[]
.fi

.PP
Default writer options.

.PP
.nf
\fC
.RS 0n
#define CMARK_OPT_SOURCEPOS 1
.RE
\f[]
.fi

.PP
Include a \f[C]data\-sourcepos\f[] attribute on all block elements.

.PP
.nf
\fC
.RS 0n
#define CMARK_OPT_HARDBREAKS 2
.RE
\f[]
.fi

.PP
Render \f[C]softbreak\f[] elements as hard line breaks.

.PP
.nf
\fC
.RS 0n
#define CMARK_OPT_NORMALIZE 4
.RE
\f[]
.fi

.PP
Normalize tree by consolidating adjacent text nodes.

.PP
.nf
\fC
.RS 0n
#define CMARK_OPT_SMART 8
.RE
\f[]
.fi

.PP
Convert straight quotes to curly, \-\-\- to em dashes, \-\- to en dashes.

.PP
.nf
\fC
.RS 0n
#define CMARK_OPT_VALIDATE_UTF8 16
.RE
\f[]
.fi

.PP
Validate UTF\-8 in the input before parsing, replacing illegal
sequences with the replacement character U+FFFD.

.SS
Version information

.PP
\fIint\f[] \fBcmark_version\f[](\fI\f[])

.PP
The library version as integer for runtime checks. Also available as
macro CMARK_VERSION for compile time checks.
.IP \[bu] 2
Bits 16\-23 contain the major version.
.IP \[bu] 2
Bits 8\-15 contain the minor version.
.IP \[bu] 2
Bits 0\-7 contain the patchlevel.
.PP
In hexadecimal format, the number 0x010203 represents version 1.2.3.

.PP
\fIconst char *\f[] \fBcmark_version_string\f[](\fI\f[])

.PP
The library version string for runtime checks. Also available as
macro CMARK_VERSION_STRING for compile time checks.

.SH
AUTHORS
.PP
John MacFarlane, Vicent Marti,  Kārlis Gaņģis, Nick Wellnhofer.