summaryrefslogtreecommitdiff
path: root/src/cmark.h
blob: fc20409e90868b00bfda4de95aa19b9c68a49323 (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
#ifndef CMARK_H
#define CMARK_H

#include <stdio.h>
#include <cmark_export.h>
#include <cmark_version.h>

#ifdef __cplusplus
extern "C" {
#endif

/** # NAME
 *
 * **cmark** - CommonMark parsing, manipulating, and rendering
 */

/** # DESCRIPTION
 *
 * ## Simple Interface
 */

/** Convert 'text' (assumed to be a UTF-8 encoded string with length
 * 'len' from CommonMark Markdown to HTML, returning a null-terminated,
 * UTF-8-encoded string.
 */
CMARK_EXPORT
char *cmark_markdown_to_html(const char *text, int len);

/** ## Node Structure
 */

typedef enum {
	/* Error status */
	CMARK_NODE_NONE,

	/* Block */
	CMARK_NODE_DOCUMENT,
	CMARK_NODE_BLOCK_QUOTE,
	CMARK_NODE_LIST,
	CMARK_NODE_ITEM,
	CMARK_NODE_CODE_BLOCK,
	CMARK_NODE_HTML,
	CMARK_NODE_PARAGRAPH,
	CMARK_NODE_HEADER,
	CMARK_NODE_HRULE,

	CMARK_NODE_FIRST_BLOCK = CMARK_NODE_DOCUMENT,
	CMARK_NODE_LAST_BLOCK  = CMARK_NODE_HRULE,

	/* Inline */
	CMARK_NODE_TEXT,
	CMARK_NODE_SOFTBREAK,
	CMARK_NODE_LINEBREAK,
	CMARK_NODE_CODE,
	CMARK_NODE_INLINE_HTML,
	CMARK_NODE_EMPH,
	CMARK_NODE_STRONG,
	CMARK_NODE_LINK,
	CMARK_NODE_IMAGE,

	CMARK_NODE_FIRST_INLINE = CMARK_NODE_TEXT,
	CMARK_NODE_LAST_INLINE  = CMARK_NODE_IMAGE,
} cmark_node_type;


typedef enum {
	CMARK_NO_LIST,
	CMARK_BULLET_LIST,
	CMARK_ORDERED_LIST
}  cmark_list_type;

typedef enum {
	CMARK_NO_DELIM,
	CMARK_PERIOD_DELIM,
	CMARK_PAREN_DELIM
} cmark_delim_type;

typedef struct cmark_node cmark_node;
typedef struct cmark_parser cmark_parser;
typedef struct cmark_iter cmark_iter;

typedef enum {
	CMARK_EVENT_NONE,
	CMARK_EVENT_DONE,
	CMARK_EVENT_ENTER,
	CMARK_EVENT_EXIT
} cmark_event_type;

/**
 * ## Creating and Destroying Nodes
 */

/** Creates a new node of type 'type'.  Note that the node may have
 * other required properties, which it is the caller's responsibility
 * to assign.
 */
CMARK_EXPORT cmark_node*
cmark_node_new(cmark_node_type type);

/** Frees the memory allocated for a node.
 */
CMARK_EXPORT void
cmark_node_free(cmark_node *node);

/**
 * ## Tree Traversal
 */

/** Returns the next node in the sequence after 'node', or NULL if
 * there is none.
 */
CMARK_EXPORT cmark_node*
cmark_node_next(cmark_node *node);

/** Returns the previous node in the sequence after 'node', or NULL if
 * there is none.
 */
CMARK_EXPORT cmark_node*
cmark_node_previous(cmark_node *node);

/** Returns the parent of 'node', or NULL if there is none.
 */
CMARK_EXPORT cmark_node*
cmark_node_parent(cmark_node *node);

/** Returns the first child of 'node', or NULL if 'node' has no children.
 */
CMARK_EXPORT cmark_node*
cmark_node_first_child(cmark_node *node);

/** Returns the last child of 'node', or NULL if 'node' has no children.
 */
CMARK_EXPORT cmark_node*
cmark_node_last_child(cmark_node *node);

/**
 * ## Iterator
 *
 * 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 'cmark_event_type' of `CMARK_EVENT_EXIT`).  The iterator will
 * return `CMARK_EVENT_DONE` when it reaches the root node again.
 * One natural application is an HTML renderer, where an `ENTER` event
 * outputs an open tag and an `EXIT` 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.
 *
 *     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);
 *     }
 *
 * Iterators will never return `EXIT` events for leaf nodes, which are nodes
 * of type:
 *
 * * CMARK_NODE_HTML
 * * CMARK_NODE_HRULE
 * * CMARK_NODE_CODE_BLOCK
 * * CMARK_NODE_TEXT
 * * CMARK_NODE_SOFTBREAK
 * * CMARK_NODE_LINEBREAK
 * * CMARK_NODE_CODE
 * * CMARK_NODE_INLINE_HTML
 *
 * Nodes must only be modified after an `EXIT` event, or an `ENTER` event for
 * leaf nodes.
 */

/** Creates a new iterator starting at 'root'.  The current node and event
 * type are undefined until `cmark_iter_next` is called for the first time.
 */
CMARK_EXPORT
cmark_iter*
cmark_iter_new(cmark_node *root);

/** Frees the memory allocated for an iterator.
 */
CMARK_EXPORT
void
cmark_iter_free(cmark_iter *iter);

/** Advances to the next node and returns the event type (`CMARK_EVENT_ENTER`,
 * `CMARK_EVENT_EXIT` or `CMARK_EVENT_DONE`).
 */
CMARK_EXPORT
cmark_event_type
cmark_iter_next(cmark_iter *iter);

/** Returns the current node.
 */
CMARK_EXPORT
cmark_node*
cmark_iter_get_node(cmark_iter *iter);

/** Returns the current event type.
 */
CMARK_EXPORT
cmark_event_type
cmark_iter_get_event_type(cmark_iter *iter);

/** Returns the root node.
 */
CMARK_EXPORT
cmark_node*
cmark_iter_get_root(cmark_iter *iter);

/** Resets the iterator so that the current node is 'current' and
 * the event type is 'event_type'.  The new current node must be a
 * descendant of the root node or the root node itself.
 */
CMARK_EXPORT
void
cmark_iter_reset(cmark_iter *iter, cmark_node *current,
                 cmark_event_type event_type);

/**
 * ## Accessors
 */

/** Returns the user data of 'node'.
 */
CMARK_EXPORT void*
cmark_node_get_user_data(cmark_node *node);

/** Sets arbitrary user data for 'node'.  Returns 1 on success,
 * 0 on failure.
 */
CMARK_EXPORT int
cmark_node_set_user_data(cmark_node *node, void *user_data);

/** Returns the type of 'node', or `CMARK_NODE_NONE` on error.
 */
CMARK_EXPORT cmark_node_type
cmark_node_get_type(cmark_node *node);

/** Like 'cmark_node_get_type', but returns a string representation
    of the type, or `"<unknown>"`.
 */
CMARK_EXPORT
const char*
cmark_node_get_type_string(cmark_node *node);

/** Returns the string contents of 'node', or NULL if none.
 */
CMARK_EXPORT const char*
cmark_node_get_literal(cmark_node *node);

/** Sets the string contents of 'node'.  Returns 1 on success,
 * 0 on failure.
 */
CMARK_EXPORT int
cmark_node_set_literal(cmark_node *node, const char *content);

/** Returns the header level of 'node', or 0 if 'node' is not a header.
 */
CMARK_EXPORT int
cmark_node_get_header_level(cmark_node *node);

/** Sets the header level of 'node', returning 1 on success and 0 on error.
 */
CMARK_EXPORT int
cmark_node_set_header_level(cmark_node *node, int level);

/** Returns the list type of 'node', or `CMARK_NO_LIST` if 'node'
 * is not a list.
 */
CMARK_EXPORT cmark_list_type
cmark_node_get_list_type(cmark_node *node);

/** Sets the list type of 'node', returning 1 on success and 0 on error.
 */
CMARK_EXPORT int
cmark_node_set_list_type(cmark_node *node, cmark_list_type type);

/** Returns the list delimiter type of 'node', or `CMARK_NO_DELIM` if 'node'
 * is not a list.
 */
CMARK_EXPORT cmark_delim_type
cmark_node_get_list_delim(cmark_node *node);

/** Sets the list delimiter type of 'node', returning 1 on success and 0
 * on error.
 */
CMARK_EXPORT int
cmark_node_set_list_delim(cmark_node *node, cmark_delim_type delim);

/** Returns starting number of 'node', if it is an ordered list, otherwise 0.
 */
CMARK_EXPORT int
cmark_node_get_list_start(cmark_node *node);

/** Sets starting number of 'node', if it is an ordered list. Returns 1
 * on success, 0 on failure.
 */
CMARK_EXPORT int
cmark_node_set_list_start(cmark_node *node, int start);

/** Returns 1 if 'node' is a tight list, 0 otherwise.
 */
CMARK_EXPORT int
cmark_node_get_list_tight(cmark_node *node);

/** Sets the "tightness" of a list.  Returns 1 on success, 0 on failure.
 */
CMARK_EXPORT int
cmark_node_set_list_tight(cmark_node *node, int tight);

/** Returns the info string from a fenced code block, or NULL if none.
 */
CMARK_EXPORT const char*
cmark_node_get_fence_info(cmark_node *node);

/** Sets the info string in a fenced code block, returning 1 on
 * success and 0 on failure.
 */
CMARK_EXPORT int
cmark_node_set_fence_info(cmark_node *node, const char *info);

/** Gets the URL of a link or image 'node', or NULL if none.
 */
CMARK_EXPORT const char*
cmark_node_get_url(cmark_node *node);

/** Sets the URL of a link or image 'node'. Returns 1 on success,
 * 0 on failure.
 */
CMARK_EXPORT int
cmark_node_set_url(cmark_node *node, const char *url);

/** Gets the title of a link or image 'node', or NULL if none.
 */
CMARK_EXPORT const char*
cmark_node_get_title(cmark_node *node);

/** Sets the title of a link or image 'node'. Returns 1 on success,
 * 0 on failure.
 */
CMARK_EXPORT int
cmark_node_set_title(cmark_node *node, const char *title);

/** Returns the line on which 'node' begins.
 */
CMARK_EXPORT int
cmark_node_get_start_line(cmark_node *node);

/** Returns the column at which 'node' begins.
 */
CMARK_EXPORT int
cmark_node_get_start_column(cmark_node *node);

/** Returns the line on which 'node' ends.
 */
CMARK_EXPORT int
cmark_node_get_end_line(cmark_node *node);

/** Returns the column at which 'node' ends.
 */
CMARK_EXPORT int
cmark_node_get_end_column(cmark_node *node);

/**
 * ## Tree Manipulation
 */

/** Unlinks a 'node', removing it from the tree, but not freeing its
 * memory.  (Use 'cmark_node_free' for that.)
 */
CMARK_EXPORT void
cmark_node_unlink(cmark_node *node);

/** Inserts 'sibling' before 'node'.  Returns 1 on success, 0 on failure.
 */
CMARK_EXPORT int
cmark_node_insert_before(cmark_node *node, cmark_node *sibling);

/** Inserts 'sibling' after 'node'. Returns 1 on success, 0 on failure.
 */
CMARK_EXPORT int
cmark_node_insert_after(cmark_node *node, cmark_node *sibling);

/** Adds 'child' to the beginning of the children of 'node'.
 * Returns 1 on success, 0 on failure.
 */
CMARK_EXPORT int
cmark_node_prepend_child(cmark_node *node, cmark_node *child);

/** Adds 'child' to the end of the children of 'node'.
 * Returns 1 on success, 0 on failure.
 */
CMARK_EXPORT int
cmark_node_append_child(cmark_node *node, cmark_node *child);

/** Consolidates adjacent text nodes.
 */
CMARK_EXPORT void
cmark_consolidate_text_nodes(cmark_node *root);

/**
 * ## Parsing
 *
 * Simple interface:
 *
 *     cmark_node *document = cmark_parse_document("Hello *world*", 12);
 *
 * Streaming interface:
 *
 *     cmark_parser *parser = cmark_parser_new();
 *     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);
 */

/** Creates a new parser object.
 */
CMARK_EXPORT
cmark_parser *cmark_parser_new();

/** Frees memory allocated for a parser object.
 */
CMARK_EXPORT
void cmark_parser_free(cmark_parser *parser);

/** Feeds a string of length 'len' to 'parser'.
 */
CMARK_EXPORT
void cmark_parser_feed(cmark_parser *parser, const char *buffer, size_t len);

/** Finish parsing and return a pointer to a tree of nodes.
 */
CMARK_EXPORT
cmark_node *cmark_parser_finish(cmark_parser *parser);

/** Parse a CommonMark document in 'buffer' of length 'len'.
 * Returns a pointer to a tree of nodes.
 */
CMARK_EXPORT
cmark_node *cmark_parse_document(const char *buffer, size_t len, int options);

/** Parse a CommonMark document in file 'f', returning a pointer to
 * a tree of nodes.
 */
CMARK_EXPORT
cmark_node *cmark_parse_file(FILE *f, int options);

/**
 * ## Rendering
 */

/** Render a 'node' tree as XML.
 */
CMARK_EXPORT
char *cmark_render_xml(cmark_node *root, int options);

/** Render a 'node' tree as an HTML fragment.  It is up to the user
 * to add an appropriate header and footer.
 */
CMARK_EXPORT
char *cmark_render_html(cmark_node *root, int options);

/** Render a 'node' tree as a groff man page, without the header.
 */
CMARK_EXPORT
char *cmark_render_man(cmark_node *root, int options);

/** Default writer options.
 */
#define CMARK_OPT_DEFAULT 0

/** Include a `data-sourcepos` attribute on all block elements.
 */
#define CMARK_OPT_SOURCEPOS 1

/** Render `softbreak` elements as hard line breaks.
 */
#define CMARK_OPT_HARDBREAKS 2

/** Normalize tree by consolidating adjacent text nodes.
 */
#define CMARK_OPT_NORMALIZE 4

/** Convert straight quotes to curly, --- to em dashes, -- to en dashes.
 */
#define CMARK_OPT_SMARTPUNCT 8

/**
 * ## Version information
 */

/** The library version as integer for runtime checks. Also available as
 * macro CMARK_VERSION for compile time checks.
 *
 * * Bits 16-23 contain the major version.
 * * Bits 8-15 contain the minor version.
 * * Bits 0-7 contain the patchlevel.
 *
 * In hexadecimal format, the number 0x010203 represents version 1.2.3.
 */
CMARK_EXPORT
extern const int cmark_version;

/** The library version string for runtime checks. Also available as
 * macro CMARK_VERSION_STRING for compile time checks.
 */
CMARK_EXPORT
extern const char cmark_version_string[];

/** # AUTHORS
 *
 * John MacFarlane, Vicent Marti,  Kārlis Gaņģis, Nick Wellnhofer.
 */

#ifndef CMARK_NO_SHORT_NAMES
#define NODE_DOCUMENT             CMARK_NODE_DOCUMENT
#define NODE_BLOCK_QUOTE          CMARK_NODE_BLOCK_QUOTE
#define NODE_LIST                 CMARK_NODE_LIST
#define NODE_ITEM                 CMARK_NODE_ITEM
#define NODE_CODE_BLOCK           CMARK_NODE_CODE_BLOCK
#define NODE_HTML                 CMARK_NODE_HTML
#define NODE_PARAGRAPH            CMARK_NODE_PARAGRAPH
#define NODE_HEADER		    CMARK_NODE_HEADER
#define NODE_HRULE                CMARK_NODE_HRULE
#define NODE_TEXT                 CMARK_NODE_TEXT
#define NODE_SOFTBREAK            CMARK_NODE_SOFTBREAK
#define NODE_LINEBREAK            CMARK_NODE_LINEBREAK
#define NODE_CODE                 CMARK_NODE_CODE
#define NODE_INLINE_HTML          CMARK_NODE_INLINE_HTML
#define NODE_EMPH                 CMARK_NODE_EMPH
#define NODE_STRONG               CMARK_NODE_STRONG
#define NODE_LINK                 CMARK_NODE_LINK
#define NODE_IMAGE                CMARK_NODE_IMAGE
#define NODE_LINK_LABEL           CMARK_NODE_LINK_LABEL
#define BULLET_LIST               CMARK_BULLET_LIST
#define ORDERED_LIST              CMARK_ORDERED_LIST
#define PERIOD_DELIM              CMARK_PERIOD_DELIM
#define PAREN_DELIM               CMARK_PAREN_DELIM
#endif

#ifdef __cplusplus
}
#endif

#endif