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03be97ab
KS		 1
2/*
3 * Introduction
4 * ************
5 *
6 * The following notes assume that you are familiar with the YAML specification
7 * (http://yaml.org/spec/cvs/current.html). We mostly follow it, although in
8 * some cases we are less restrictive that it requires.
9 *
10 * The process of transforming a YAML stream into a sequence of events is
11 * divided on two steps: Scanning and Parsing.
12 *
13 * The Scanner transforms the input stream into a sequence of tokens, while the
14 * parser transform the sequence of tokens produced by the Scanner into a
15 * sequence of parsing events.
16 *
17 * The Scanner is rather clever and complicated. The Parser, on the contrary,
18 * is a straightforward implementation of a recursive-descendant parser (or,
19 * LL(1) parser, as it is usually called).
20 *
21 * Actually there are two issues of Scanning that might be called "clever", the
22 * rest is quite straightforward. The issues are "block collection start" and
23 * "simple keys". Both issues are explained below in details.
24 *
25 * Here the Scanning step is explained and implemented. We start with the list
26 * of all the tokens produced by the Scanner together with short descriptions.
27 *
28 * Now, tokens:
29 *
30 * STREAM-START(encoding) # The stream start.
31 * STREAM-END # The stream end.
32 * VERSION-DIRECTIVE(major,minor) # The '%YAML' directive.
33 * TAG-DIRECTIVE(handle,prefix) # The '%TAG' directive.
34 * DOCUMENT-START # '---'
35 * DOCUMENT-END # '...'
36 * BLOCK-SEQUENCE-START # Indentation increase denoting a block
37 * BLOCK-MAPPING-START # sequence or a block mapping.
38 * BLOCK-END # Indentation decrease.
39 * FLOW-SEQUENCE-START # '['
40 * FLOW-SEQUENCE-END # ']'
41 * BLOCK-SEQUENCE-START # '{'
42 * BLOCK-SEQUENCE-END # '}'
43 * BLOCK-ENTRY # '-'
44 * FLOW-ENTRY # ','
45 * KEY # '?' or nothing (simple keys).
46 * VALUE # ':'
47 * ALIAS(anchor) # '*anchor'
48 * ANCHOR(anchor) # '&anchor'
49 * TAG(handle,suffix) # '!handle!suffix'
50 * SCALAR(value,style) # A scalar.
51 *
52 * The following two tokens are "virtual" tokens denoting the beginning and the
53 * end of the stream:
54 *
55 * STREAM-START(encoding)
56 * STREAM-END
57 *
58 * We pass the information about the input stream encoding with the
59 * STREAM-START token.
60 *
61 * The next two tokens are responsible for tags:
62 *
63 * VERSION-DIRECTIVE(major,minor)
64 * TAG-DIRECTIVE(handle,prefix)
65 *
66 * Example:
67 *
68 * %YAML 1.1
69 * %TAG ! !foo
70 * %TAG !yaml! tag:yaml.org,2002:
71 * ---
72 *
73 * The correspoding sequence of tokens:
74 *
75 * STREAM-START(utf-8)
76 * VERSION-DIRECTIVE(1,1)
77 * TAG-DIRECTIVE("!","!foo")
78 * TAG-DIRECTIVE("!yaml","tag:yaml.org,2002:")
79 * DOCUMENT-START
80 * STREAM-END
81 *
82 * Note that the VERSION-DIRECTIVE and TAG-DIRECTIVE tokens occupy a whole
83 * line.
84 *
85 * The document start and end indicators are represented by:
86 *
87 * DOCUMENT-START
88 * DOCUMENT-END
89 *
90 * Note that if a YAML stream contains an implicit document (without '---'
91 * and '...' indicators), no DOCUMENT-START and DOCUMENT-END tokens will be
92 * produced.
93 *
94 * In the following examples, we present whole documents together with the
95 * produced tokens.
96 *
97 * 1. An implicit document:
98 *
99 * 'a scalar'
100 *
101 * Tokens:
102 *
103 * STREAM-START(utf-8)
104 * SCALAR("a scalar",single-quoted)
105 * STREAM-END
106 *
107 * 2. An explicit document:
108 *
109 * ---
110 * 'a scalar'
111 * ...
112 *
113 * Tokens:
114 *
115 * STREAM-START(utf-8)
116 * DOCUMENT-START
117 * SCALAR("a scalar",single-quoted)
118 * DOCUMENT-END
119 * STREAM-END
120 *
121 * 3. Several documents in a stream:
122 *
123 * 'a scalar'
124 * ---
125 * 'another scalar'
126 * ---
127 * 'yet another scalar'
128 *
129 * Tokens:
130 *
131 * STREAM-START(utf-8)
132 * SCALAR("a scalar",single-quoted)
133 * DOCUMENT-START
134 * SCALAR("another scalar",single-quoted)
135 * DOCUMENT-START
136 * SCALAR("yet another scalar",single-quoted)
137 * STREAM-END
138 *
139 * We have already introduced the SCALAR token above. The following tokens are
140 * used to describe aliases, anchors, tag, and scalars:
141 *
142 * ALIAS(anchor)
143 * ANCHOR(anchor)
144 * TAG(handle,suffix)
145 * SCALAR(value,style)
146 *
147 * The following series of examples illustrate the usage of these tokens:
148 *
149 * 1. A recursive sequence:
150 *
151 * &A [ *A ]
152 *
153 * Tokens:
154 *
155 * STREAM-START(utf-8)
156 * ANCHOR("A")
157 * FLOW-SEQUENCE-START
158 * ALIAS("A")
159 * FLOW-SEQUENCE-END
160 * STREAM-END
161 *
162 * 2. A tagged scalar:
163 *
164 * !!float "3.14" # A good approximation.
165 *
166 * Tokens:
167 *
168 * STREAM-START(utf-8)
169 * TAG("!!","float")
170 * SCALAR("3.14",double-quoted)
171 * STREAM-END
172 *
173 * 3. Various scalar styles:
174 *
175 * --- # Implicit empty plain scalars do not produce tokens.
176 * --- a plain scalar
177 * --- 'a single-quoted scalar'
178 * --- "a double-quoted scalar"
179 * --- |-
180 * a literal scalar
181 * --- >-
182 * a folded
183 * scalar
184 *
185 * Tokens:
186 *
187 * STREAM-START(utf-8)
188 * DOCUMENT-START
189 * DOCUMENT-START
190 * SCALAR("a plain scalar",plain)
191 * DOCUMENT-START
192 * SCALAR("a single-quoted scalar",single-quoted)
193 * DOCUMENT-START
194 * SCALAR("a double-quoted scalar",double-quoted)
195 * DOCUMENT-START
196 * SCALAR("a literal scalar",literal)
197 * DOCUMENT-START
198 * SCALAR("a folded scalar",folded)
199 * STREAM-END
200 *
201 * Now it's time to review collection-related tokens. We will start with
202 * flow collections:
203 *
204 * FLOW-SEQUENCE-START
205 * FLOW-SEQUENCE-END
206 * FLOW-MAPPING-START
207 * FLOW-MAPPING-END
208 * FLOW-ENTRY
209 * KEY
210 * VALUE
211 *
212 * The tokens FLOW-SEQUENCE-START, FLOW-SEQUENCE-END, FLOW-MAPPING-START, and
213 * FLOW-MAPPING-END represent the indicators '[', ']', '{', and '}'
214 * correspondingly. FLOW-ENTRY represent the ',' indicator. Finally the
215 * indicators '?' and ':', which are used for denoting mapping keys and values,
216 * are represented by the KEY and VALUE tokens.
217 *
218 * The following examples show flow collections:
219 *
220 * 1. A flow sequence:
221 *
222 * [item 1, item 2, item 3]
223 *
224 * Tokens:
225 *
226 * STREAM-START(utf-8)
227 * FLOW-SEQUENCE-START
228 * SCALAR("item 1",plain)
229 * FLOW-ENTRY
230 * SCALAR("item 2",plain)
231 * FLOW-ENTRY
232 * SCALAR("item 3",plain)
233 * FLOW-SEQUENCE-END
234 * STREAM-END
235 *
236 * 2. A flow mapping:
237 *
238 * {
239 * a simple key: a value, # Note that the KEY token is produced.
240 * ? a complex key: another value,
241 * }
242 *
243 * Tokens:
244 *
245 * STREAM-START(utf-8)
246 * FLOW-MAPPING-START
247 * KEY
248 * SCALAR("a simple key",plain)
249 * VALUE
250 * SCALAR("a value",plain)
251 * FLOW-ENTRY
252 * KEY
253 * SCALAR("a complex key",plain)
254 * VALUE
255 * SCALAR("another value",plain)
256 * FLOW-ENTRY
257 * FLOW-MAPPING-END
258 * STREAM-END
259 *
260 * A simple key is a key which is not denoted by the '?' indicator. Note that
261 * the Scanner still produce the KEY token whenever it encounters a simple key.
262 *
263 * For scanning block collections, the following tokens are used (note that we
264 * repeat KEY and VALUE here):
265 *
266 * BLOCK-SEQUENCE-START
267 * BLOCK-MAPPING-START
268 * BLOCK-END
269 * BLOCK-ENTRY
270 * KEY
271 * VALUE
272 *
273 * The tokens BLOCK-SEQUENCE-START and BLOCK-MAPPING-START denote indentation
274 * increase that precedes a block collection (cf. the INDENT token in Python).
275 * The token BLOCK-END denote indentation decrease that ends a block collection
276 * (cf. the DEDENT token in Python). However YAML has some syntax pecularities
277 * that makes detections of these tokens more complex.
278 *
279 * The tokens BLOCK-ENTRY, KEY, and VALUE are used to represent the indicators
280 * '-', '?', and ':' correspondingly.
281 *
282 * The following examples show how the tokens BLOCK-SEQUENCE-START,
283 * BLOCK-MAPPING-START, and BLOCK-END are emitted by the Scanner:
284 *
285 * 1. Block sequences:
286 *
287 * - item 1
288 * - item 2
289 * -
290 * - item 3.1
291 * - item 3.2
292 * -
293 * key 1: value 1
294 * key 2: value 2
295 *
296 * Tokens:
297 *
298 * STREAM-START(utf-8)
299 * BLOCK-SEQUENCE-START
300 * BLOCK-ENTRY
301 * SCALAR("item 1",plain)
302 * BLOCK-ENTRY
303 * SCALAR("item 2",plain)
304 * BLOCK-ENTRY
305 * BLOCK-SEQUENCE-START
306 * BLOCK-ENTRY
307 * SCALAR("item 3.1",plain)
308 * BLOCK-ENTRY
309 * SCALAR("item 3.2",plain)
310 * BLOCK-END
311 * BLOCK-ENTRY
312 * BLOCK-MAPPING-START
313 * KEY
314 * SCALAR("key 1",plain)
315 * VALUE
316 * SCALAR("value 1",plain)
317 * KEY
318 * SCALAR("key 2",plain)
319 * VALUE
320 * SCALAR("value 2",plain)
321 * BLOCK-END
322 * BLOCK-END
323 * STREAM-END
324 *
325 * 2. Block mappings:
326 *
327 * a simple key: a value # The KEY token is produced here.
328 * ? a complex key
329 * : another value
330 * a mapping:
331 * key 1: value 1
332 * key 2: value 2
333 * a sequence:
334 * - item 1
335 * - item 2
336 *
337 * Tokens:
338 *
339 * STREAM-START(utf-8)
340 * BLOCK-MAPPING-START
341 * KEY
342 * SCALAR("a simple key",plain)
343 * VALUE
344 * SCALAR("a value",plain)
345 * KEY
346 * SCALAR("a complex key",plain)
347 * VALUE
348 * SCALAR("another value",plain)
349 * KEY
350 * SCALAR("a mapping",plain)
351 * BLOCK-MAPPING-START
352 * KEY
353 * SCALAR("key 1",plain)
354 * VALUE
355 * SCALAR("value 1",plain)
356 * KEY
357 * SCALAR("key 2",plain)
358 * VALUE
359 * SCALAR("value 2",plain)
360 * BLOCK-END
361 * KEY
362 * SCALAR("a sequence",plain)
363 * VALUE
364 * BLOCK-SEQUENCE-START
365 * BLOCK-ENTRY
366 * SCALAR("item 1",plain)
367 * BLOCK-ENTRY
368 * SCALAR("item 2",plain)
369 * BLOCK-END
370 * BLOCK-END
371 * STREAM-END
372 *
373 * YAML does not always require to start a new block collection from a new
374 * line. If the current line contains only '-', '?', and ':' indicators, a new
375 * block collection may start at the current line. The following examples
376 * illustrate this case:
377 *
378 * 1. Collections in a sequence:
379 *
380 * - - item 1
381 * - item 2
382 * - key 1: value 1
383 * key 2: value 2
384 * - ? complex key
385 * : complex value
386 *
387 * Tokens:
388 *
389 * STREAM-START(utf-8)
390 * BLOCK-SEQUENCE-START
391 * BLOCK-ENTRY
392 * BLOCK-SEQUENCE-START
393 * BLOCK-ENTRY
394 * SCALAR("item 1",plain)
395 * BLOCK-ENTRY
396 * SCALAR("item 2",plain)
397 * BLOCK-END
398 * BLOCK-ENTRY
399 * BLOCK-MAPPING-START
400 * KEY
401 * SCALAR("key 1",plain)
402 * VALUE
403 * SCALAR("value 1",plain)
404 * KEY
405 * SCALAR("key 2",plain)
406 * VALUE
407 * SCALAR("value 2",plain)
408 * BLOCK-END
409 * BLOCK-ENTRY
410 * BLOCK-MAPPING-START
411 * KEY
412 * SCALAR("complex key")
413 * VALUE
414 * SCALAR("complex value")
415 * BLOCK-END
416 * BLOCK-END
417 * STREAM-END
418 *
419 * 2. Collections in a mapping:
420 *
421 * ? a sequence
422 * : - item 1
423 * - item 2
424 * ? a mapping
425 * : key 1: value 1
426 * key 2: value 2
427 *
428 * Tokens:
429 *
430 * STREAM-START(utf-8)
431 * BLOCK-MAPPING-START
432 * KEY
433 * SCALAR("a sequence",plain)
434 * VALUE
435 * BLOCK-SEQUENCE-START
436 * BLOCK-ENTRY
437 * SCALAR("item 1",plain)
438 * BLOCK-ENTRY
439 * SCALAR("item 2",plain)
440 * BLOCK-END
441 * KEY
442 * SCALAR("a mapping",plain)
443 * VALUE
444 * BLOCK-MAPPING-START
445 * KEY
446 * SCALAR("key 1",plain)
447 * VALUE
448 * SCALAR("value 1",plain)
449 * KEY
450 * SCALAR("key 2",plain)
451 * VALUE
452 * SCALAR("value 2",plain)
453 * BLOCK-END
454 * BLOCK-END
455 * STREAM-END
456 *
457 * YAML also permits non-indented sequences if they are included into a block
458 * mapping. In this case, the token BLOCK-SEQUENCE-START is not produced:
459 *
460 * key:
461 * - item 1 # BLOCK-SEQUENCE-START is NOT produced here.
462 * - item 2
463 *
464 * Tokens:
465 *
466 * STREAM-START(utf-8)
467 * BLOCK-MAPPING-START
468 * KEY
469 * SCALAR("key",plain)
470 * VALUE
471 * BLOCK-ENTRY
472 * SCALAR("item 1",plain)
473 * BLOCK-ENTRY
474 * SCALAR("item 2",plain)
475 * BLOCK-END
476 */
477
625fcfe9 478#include "yaml_private.h"
03be97ab 479
f2b59d4d
KS		 480/*
481 * Ensure that the buffer contains the required number of characters.
482 * Return 1 on success, 0 on failure (reader error or memory error).
483 */
484
625fcfe9
KS		 485#define CACHE(parser,length) \
486 (parser->unread >= (length) \
487 ? 1 \
f2b59d4d
KS		 488 : yaml_parser_update_buffer(parser, (length)))
489
eb9cceb5
KS		 490/*
491 * Advance the buffer pointer.
492 */
493
625fcfe9
KS		 494#define SKIP(parser) \
495 (parser->mark.index ++, \
496 parser->mark.column ++, \
497 parser->unread --, \
e35af832 498 parser->buffer.pointer += WIDTH(parser->buffer))
e71095e3 499
625fcfe9 500#define SKIP_LINE(parser) \
e35af832 501 (IS_CRLF(parser->buffer) ? \
625fcfe9
KS		 502 (parser->mark.index += 2, \
503 parser->mark.column = 0, \
504 parser->mark.line ++, \
505 parser->unread -= 2, \
506 parser->buffer.pointer += 2) : \
e35af832 507 IS_BREAK(parser->buffer) ? \
625fcfe9
KS		 508 (parser->mark.index ++, \
509 parser->mark.column = 0, \
510 parser->mark.line ++, \
511 parser->unread --, \
e35af832 512 parser->buffer.pointer += WIDTH(parser->buffer)) : 0)
e71095e3
KS		 513
514/*
515 * Copy a character to a string buffer and advance pointers.
516 */
517
625fcfe9
KS		 518#define READ(parser,string) \
519 (STRING_EXTEND(parser,string) ? \
e35af832 520 (COPY(string,parser->buffer), \
625fcfe9
KS		 521 parser->mark.index ++, \
522 parser->mark.column ++, \
523 parser->unread --, \
524 1) : 0)
92d41fe1
KS		 525
526/*
527 * Copy a line break character to a string buffer and advance pointers.
528 */
529
625fcfe9
KS		 530#define READ_LINE(parser,string) \
531 (STRING_EXTEND(parser,string) ? \
e35af832
KS		 532 (((CHECK_AT(parser->buffer,'\r',0) \
533 && CHECK_AT(parser->buffer,'\n',1)) ? /* CR LF -> LF */ \
92d41fe1 534 (*((string).pointer++) = (yaml_char_t) '\n', \
625fcfe9
KS		 535 parser->buffer.pointer += 2, \
536 parser->mark.index += 2, \
537 parser->mark.column = 0, \
538 parser->mark.line ++, \
92d41fe1 539 parser->unread -= 2) : \
e35af832
KS		 540 (CHECK_AT(parser->buffer,'\r',0) \
541 || CHECK_AT(parser->buffer,'\n',0)) ? /* CR|LF -> LF */ \
92d41fe1 542 (*((string).pointer++) = (yaml_char_t) '\n', \
625fcfe9
KS		 543 parser->buffer.pointer ++, \
544 parser->mark.index ++, \
545 parser->mark.column = 0, \
546 parser->mark.line ++, \
92d41fe1 547 parser->unread --) : \
e35af832
KS		 548 (CHECK_AT(parser->buffer,'\xC2',0) \
549 && CHECK_AT(parser->buffer,'\x85',1)) ? /* NEL -> LF */ \
92d41fe1 550 (*((string).pointer++) = (yaml_char_t) '\n', \
625fcfe9
KS		 551 parser->buffer.pointer += 2, \
552 parser->mark.index ++, \
553 parser->mark.column = 0, \
554 parser->mark.line ++, \
92d41fe1 555 parser->unread --) : \
e35af832
KS		 556 (CHECK_AT(parser->buffer,'\xE2',0) && \
557 CHECK_AT(parser->buffer,'\x80',1) && \
558 (CHECK_AT(parser->buffer,'\xA8',2) || \
559 CHECK_AT(parser->buffer,'\xA9',2))) ? /* LS|PS -> LS|PS */ \
625fcfe9
KS		 560 (*((string).pointer++) = *(parser->buffer.pointer++), \
561 *((string).pointer++) = *(parser->buffer.pointer++), \
562 *((string).pointer++) = *(parser->buffer.pointer++), \
563 parser->mark.index ++, \
564 parser->mark.column = 0, \
565 parser->mark.line ++, \
566 parser->unread --) : 0), \
567 1) : 0)
92d41fe1 568
625fcfe9
KS		 569/*
570 * Public API declarations.
571 */
e71095e3 572
625fcfe9
KS		 573YAML_DECLARE(int)
574yaml_parser_scan(yaml_parser_t *parser, yaml_token_t *token);
92d41fe1 575
625fcfe9
KS		 576/*
577 * Error handling.
578 */
92d41fe1 579
e71095e3 580static int
625fcfe9
KS		 581yaml_parser_set_scanner_error(yaml_parser_t *parser, const char *context,
582 yaml_mark_t context_mark, const char *problem);
e71095e3 583
03be97ab
KS		 584/*
585 * High-level token API.
586 */
587
625fcfe9 588YAML_DECLARE(int)
03be97ab
KS		 589yaml_parser_fetch_more_tokens(yaml_parser_t *parser);
590
591static int
592yaml_parser_fetch_next_token(yaml_parser_t *parser);
593
594/*
595 * Potential simple keys.
596 */
597
598static int
599yaml_parser_stale_simple_keys(yaml_parser_t *parser);
600
601static int
602yaml_parser_save_simple_key(yaml_parser_t *parser);
603
604static int
605yaml_parser_remove_simple_key(yaml_parser_t *parser);
606
eb9cceb5
KS		 607static int
608yaml_parser_increase_flow_level(yaml_parser_t *parser);
609
610static int
611yaml_parser_decrease_flow_level(yaml_parser_t *parser);
612
03be97ab
KS		 613/*
614 * Indentation treatment.
615 */
616
617static int
eb9cceb5
KS		 618yaml_parser_roll_indent(yaml_parser_t *parser, int column,
619 int number, yaml_token_type_t type, yaml_mark_t mark);
03be97ab
KS		 620
621static int
f2b59d4d 622yaml_parser_unroll_indent(yaml_parser_t *parser, int column);
03be97ab
KS		 623
624/*
625 * Token fetchers.
626 */
627
628static int
629yaml_parser_fetch_stream_start(yaml_parser_t *parser);
630
631static int
632yaml_parser_fetch_stream_end(yaml_parser_t *parser);
633
634static int
635yaml_parser_fetch_directive(yaml_parser_t *parser);
636
03be97ab
KS		 637static int
638yaml_parser_fetch_document_indicator(yaml_parser_t *parser,
639 yaml_token_type_t type);
640
03be97ab
KS		 641static int
642yaml_parser_fetch_flow_collection_start(yaml_parser_t *parser,
643 yaml_token_type_t type);
644
03be97ab
KS		 645static int
646yaml_parser_fetch_flow_collection_end(yaml_parser_t *parser,
647 yaml_token_type_t type);
648
649static int
650yaml_parser_fetch_flow_entry(yaml_parser_t *parser);
651
652static int
653yaml_parser_fetch_block_entry(yaml_parser_t *parser);
654
655static int
656yaml_parser_fetch_key(yaml_parser_t *parser);
657
658static int
659yaml_parser_fetch_value(yaml_parser_t *parser);
660
661static int
eb9cceb5 662yaml_parser_fetch_anchor(yaml_parser_t *parser, yaml_token_type_t type);
03be97ab
KS		 663
664static int
665yaml_parser_fetch_tag(yaml_parser_t *parser);
666
03be97ab
KS		 667static int
668yaml_parser_fetch_block_scalar(yaml_parser_t *parser, int literal);
669
03be97ab
KS		 670static int
671yaml_parser_fetch_flow_scalar(yaml_parser_t *parser, int single);
672
673static int
674yaml_parser_fetch_plain_scalar(yaml_parser_t *parser);
675
676/*
677 * Token scanners.
678 */
679
680static int
681yaml_parser_scan_to_next_token(yaml_parser_t *parser);
682
625fcfe9
KS		 683static int
684yaml_parser_scan_directive(yaml_parser_t *parser, yaml_token_t *token);
03be97ab
KS		 685
686static int
687yaml_parser_scan_directive_name(yaml_parser_t *parser,
688 yaml_mark_t start_mark, yaml_char_t **name);
689
690static int
e71095e3 691yaml_parser_scan_version_directive_value(yaml_parser_t *parser,
03be97ab
KS		 692 yaml_mark_t start_mark, int *major, int *minor);
693
694static int
e71095e3 695yaml_parser_scan_version_directive_number(yaml_parser_t *parser,
03be97ab
KS		 696 yaml_mark_t start_mark, int *number);
697
698static int
699yaml_parser_scan_tag_directive_value(yaml_parser_t *parser,
e71095e3 700 yaml_mark_t mark, yaml_char_t **handle, yaml_char_t **prefix);
03be97ab 701
625fcfe9
KS		 702static int
703yaml_parser_scan_anchor(yaml_parser_t *parser, yaml_token_t *token,
03be97ab
KS		 704 yaml_token_type_t type);
705
625fcfe9
KS		 706static int
707yaml_parser_scan_tag(yaml_parser_t *parser, yaml_token_t *token);
03be97ab
KS		 708
709static int
710yaml_parser_scan_tag_handle(yaml_parser_t *parser, int directive,
711 yaml_mark_t start_mark, yaml_char_t **handle);
712
713static int
714yaml_parser_scan_tag_uri(yaml_parser_t *parser, int directive,
e71095e3
KS		 715 yaml_char_t *head, yaml_mark_t start_mark, yaml_char_t **uri);
716
717static int
718yaml_parser_scan_uri_escapes(yaml_parser_t *parser, int directive,
719 yaml_mark_t start_mark, yaml_string_t *string);
03be97ab 720
625fcfe9
KS		 721static int
722yaml_parser_scan_block_scalar(yaml_parser_t *parser, yaml_token_t *token,
723 int literal);
03be97ab 724
92d41fe1
KS		 725static int
726yaml_parser_scan_block_scalar_breaks(yaml_parser_t *parser,
727 int *indent, yaml_string_t *breaks,
728 yaml_mark_t start_mark, yaml_mark_t *end_mark);
729
625fcfe9
KS		 730static int
731yaml_parser_scan_flow_scalar(yaml_parser_t *parser, yaml_token_t *token,
732 int single);
03be97ab 733
625fcfe9
KS		 734static int
735yaml_parser_scan_plain_scalar(yaml_parser_t *parser, yaml_token_t *token);
03be97ab 736
f2b59d4d 737/*
625fcfe9 738 * Get the next token.
f2b59d4d
KS		 739 */
740
625fcfe9
KS		 741YAML_DECLARE(int)
742yaml_parser_scan(yaml_parser_t *parser, yaml_token_t *token)
f2b59d4d 743{
f2b59d4d 744 assert(parser); /* Non-NULL parser object is expected. */
625fcfe9 745 assert(token); /* Non-NULL token object is expected. */
f2b59d4d 746
5a00d8fe
KS		 747 /* Erase the token object. */
748
749 memset(token, 0, sizeof(yaml_token_t));
750
625fcfe9 751 /* No tokens after STREAM-END or error. */
f2b59d4d 752
625fcfe9 753 if (parser->stream_end_produced || parser->error) {
625fcfe9 754 return 1;
7e32c194
KS		 755 }
756
f2b59d4d
KS		 757 /* Ensure that the tokens queue contains enough tokens. */
758
625fcfe9
KS		 759 if (!parser->token_available) {
760 if (!yaml_parser_fetch_more_tokens(parser))
761 return 0;
92d41fe1
KS		 762 }
763
625fcfe9
KS		 764 /* Fetch the next token from the queue. */
765
766 *token = DEQUEUE(parser, parser->tokens);
767 parser->token_available = 0;
768 parser->tokens_parsed ++;
e71095e3 769
625fcfe9
KS		 770 if (token->type == YAML_STREAM_END_TOKEN) {
771 parser->stream_end_produced = 1;
e71095e3
KS		 772 }
773
e71095e3
KS		 774 return 1;
775}
776
f2b59d4d
KS		 777/*
778 * Set the scanner error and return 0.
779 */
780
781static int
782yaml_parser_set_scanner_error(yaml_parser_t *parser, const char *context,
783 yaml_mark_t context_mark, const char *problem)
784{
785 parser->error = YAML_SCANNER_ERROR;
786 parser->context = context;
787 parser->context_mark = context_mark;
788 parser->problem = problem;
625fcfe9 789 parser->problem_mark = parser->mark;
7e32c194
KS		 790
791 return 0;
f2b59d4d
KS		 792}
793
f2b59d4d
KS		 794/*
795 * Ensure that the tokens queue contains at least one token which can be
796 * returned to the Parser.
797 */
798
625fcfe9 799YAML_DECLARE(int)
f2b59d4d
KS		 800yaml_parser_fetch_more_tokens(yaml_parser_t *parser)
801{
802 int need_more_tokens;
f2b59d4d
KS		 803
804 /* While we need more tokens to fetch, do it. */
805
806 while (1)
807 {
808 /*
809 * Check if we really need to fetch more tokens.
810 */
811
812 need_more_tokens = 0;
813
625fcfe9 814 if (parser->tokens.head == parser->tokens.tail)
f2b59d4d
KS		 815 {
816 /* Queue is empty. */
817
818 need_more_tokens = 1;
819 }
820 else
821 {
625fcfe9
KS		 822 yaml_simple_key_t *simple_key;
823
f2b59d4d
KS		 824 /* Check if any potential simple key may occupy the head position. */
825
7e32c194
KS		 826 if (!yaml_parser_stale_simple_keys(parser))
827 return 0;
828
625fcfe9
KS		 829 for (simple_key = parser->simple_keys.start;
830 simple_key != parser->simple_keys.top; simple_key++) {
831 if (simple_key->possible
832 && simple_key->token_number == parser->tokens_parsed) {
f2b59d4d
KS		 833 need_more_tokens = 1;
834 break;
835 }
836 }
837 }
838
839 /* We are finished. */
840
841 if (!need_more_tokens)
842 break;
843
844 /* Fetch the next token. */
845
846 if (!yaml_parser_fetch_next_token(parser))
847 return 0;
848 }
849
625fcfe9
KS		 850 parser->token_available = 1;
851
f2b59d4d
KS		 852 return 1;
853}
854
855/*
856 * The dispatcher for token fetchers.
857 */
858
859static int
860yaml_parser_fetch_next_token(yaml_parser_t *parser)
861{
862 /* Ensure that the buffer is initialized. */
863
625fcfe9 864 if (!CACHE(parser, 1))
f2b59d4d
KS		 865 return 0;
866
867 /* Check if we just started scanning. Fetch STREAM-START then. */
868
869 if (!parser->stream_start_produced)
870 return yaml_parser_fetch_stream_start(parser);
871
872 /* Eat whitespaces and comments until we reach the next token. */
873
874 if (!yaml_parser_scan_to_next_token(parser))
875 return 0;
876
7e32c194
KS		 877 /* Remove obsolete potential simple keys. */
878
879 if (!yaml_parser_stale_simple_keys(parser))
880 return 0;
881
f2b59d4d
KS		 882 /* Check the indentation level against the current column. */
883
625fcfe9 884 if (!yaml_parser_unroll_indent(parser, parser->mark.column))
f2b59d4d
KS		 885 return 0;
886
887 /*
888 * Ensure that the buffer contains at least 4 characters. 4 is the length
889 * of the longest indicators ('--- ' and '... ').
890 */
891
625fcfe9 892 if (!CACHE(parser, 4))
f2b59d4d
KS		 893 return 0;
894
895 /* Is it the end of the stream? */
896
e35af832 897 if (IS_Z(parser->buffer))
f2b59d4d
KS		 898 return yaml_parser_fetch_stream_end(parser);
899
900 /* Is it a directive? */
901
e35af832 902 if (parser->mark.column == 0 && CHECK(parser->buffer, '%'))
f2b59d4d
KS		 903 return yaml_parser_fetch_directive(parser);
904
905 /* Is it the document start indicator? */
906
625fcfe9 907 if (parser->mark.column == 0
e35af832
KS		 908 && CHECK_AT(parser->buffer, '-', 0)
909 && CHECK_AT(parser->buffer, '-', 1)
910 && CHECK_AT(parser->buffer, '-', 2)
911 && IS_BLANKZ_AT(parser->buffer, 3))
eb9cceb5
KS		 912 return yaml_parser_fetch_document_indicator(parser,
913 YAML_DOCUMENT_START_TOKEN);
f2b59d4d
KS		 914
915 /* Is it the document end indicator? */
916
625fcfe9 917 if (parser->mark.column == 0
e35af832
KS		 918 && CHECK_AT(parser->buffer, '.', 0)
919 && CHECK_AT(parser->buffer, '.', 1)
920 && CHECK_AT(parser->buffer, '.', 2)
921 && IS_BLANKZ_AT(parser->buffer, 3))
eb9cceb5
KS		 922 return yaml_parser_fetch_document_indicator(parser,
923 YAML_DOCUMENT_END_TOKEN);
f2b59d4d
KS		 924
925 /* Is it the flow sequence start indicator? */
926
e35af832 927 if (CHECK(parser->buffer, '['))
eb9cceb5
KS		 928 return yaml_parser_fetch_flow_collection_start(parser,
929 YAML_FLOW_SEQUENCE_START_TOKEN);
f2b59d4d
KS		 930
931 /* Is it the flow mapping start indicator? */
932
e35af832 933 if (CHECK(parser->buffer, '{'))
eb9cceb5
KS		 934 return yaml_parser_fetch_flow_collection_start(parser,
935 YAML_FLOW_MAPPING_START_TOKEN);
f2b59d4d
KS		 936
937 /* Is it the flow sequence end indicator? */
938
e35af832 939 if (CHECK(parser->buffer, ']'))
eb9cceb5
KS		 940 return yaml_parser_fetch_flow_collection_end(parser,
941 YAML_FLOW_SEQUENCE_END_TOKEN);
f2b59d4d
KS		 942
943 /* Is it the flow mapping end indicator? */
944
e35af832 945 if (CHECK(parser->buffer, '}'))
eb9cceb5
KS		 946 return yaml_parser_fetch_flow_collection_end(parser,
947 YAML_FLOW_MAPPING_END_TOKEN);
f2b59d4d
KS		 948
949 /* Is it the flow entry indicator? */
950
e35af832 951 if (CHECK(parser->buffer, ','))
f2b59d4d
KS		 952 return yaml_parser_fetch_flow_entry(parser);
953
954 /* Is it the block entry indicator? */
955
e35af832 956 if (CHECK(parser->buffer, '-') && IS_BLANKZ_AT(parser->buffer, 1))
f2b59d4d
KS		 957 return yaml_parser_fetch_block_entry(parser);
958
959 /* Is it the key indicator? */
960
e35af832
KS		 961 if (CHECK(parser->buffer, '?')
962 && (parser->flow_level || IS_BLANKZ_AT(parser->buffer, 1)))
f2b59d4d
KS		 963 return yaml_parser_fetch_key(parser);
964
965 /* Is it the value indicator? */
966
e35af832
KS		 967 if (CHECK(parser->buffer, ':')
968 && (parser->flow_level || IS_BLANKZ_AT(parser->buffer, 1)))
f2b59d4d
KS		 969 return yaml_parser_fetch_value(parser);
970
971 /* Is it an alias? */
972
e35af832 973 if (CHECK(parser->buffer, '*'))
eb9cceb5 974 return yaml_parser_fetch_anchor(parser, YAML_ALIAS_TOKEN);
f2b59d4d
KS		 975
976 /* Is it an anchor? */
977
e35af832 978 if (CHECK(parser->buffer, '&'))
eb9cceb5 979 return yaml_parser_fetch_anchor(parser, YAML_ANCHOR_TOKEN);
f2b59d4d
KS		 980
981 /* Is it a tag? */
982
e35af832 983 if (CHECK(parser->buffer, '!'))
f2b59d4d
KS		 984 return yaml_parser_fetch_tag(parser);
985
986 /* Is it a literal scalar? */
987
e35af832 988 if (CHECK(parser->buffer, '|') && !parser->flow_level)
f2b59d4d
KS		 989 return yaml_parser_fetch_block_scalar(parser, 1);
990
991 /* Is it a folded scalar? */
992
e35af832 993 if (CHECK(parser->buffer, '>') && !parser->flow_level)
f2b59d4d
KS		 994 return yaml_parser_fetch_block_scalar(parser, 0);
995
996 /* Is it a single-quoted scalar? */
997
e35af832 998 if (CHECK(parser->buffer, '\''))
f2b59d4d
KS		 999 return yaml_parser_fetch_flow_scalar(parser, 1);
1000
1001 /* Is it a double-quoted scalar? */
1002
e35af832 1003 if (CHECK(parser->buffer, '"'))
f2b59d4d
KS		 1004 return yaml_parser_fetch_flow_scalar(parser, 0);
1005
1006 /*
1007 * Is it a plain scalar?
1008 *
1009 * A plain scalar may start with any non-blank characters except
1010 *
1011 * '-', '?', ':', ',', '[', ']', '{', '}',
1012 * '#', '&', '*', '!', '|', '>', '\'', '\"',
1013 * '%', '@', '`'.
1014 *
7e32c194
KS		 1015 * In the block context (and, for the '-' indicator, in the flow context
1016 * too), it may also start with the characters
f2b59d4d
KS		 1017 *
1018 * '-', '?', ':'
1019 *
1020 * if it is followed by a non-space character.
1021 *
1022 * The last rule is more restrictive than the specification requires.
1023 */
1024
e35af832
KS		 1025 if (!(IS_BLANKZ(parser->buffer) || CHECK(parser->buffer, '-')
1026 || CHECK(parser->buffer, '?') || CHECK(parser->buffer, ':')
1027 || CHECK(parser->buffer, ',') || CHECK(parser->buffer, '[')
1028 || CHECK(parser->buffer, ']') || CHECK(parser->buffer, '{')
1029 || CHECK(parser->buffer, '}') || CHECK(parser->buffer, '#')
1030 || CHECK(parser->buffer, '&') || CHECK(parser->buffer, '*')
1031 || CHECK(parser->buffer, '!') || CHECK(parser->buffer, '|')
1032 || CHECK(parser->buffer, '>') || CHECK(parser->buffer, '\'')
1033 || CHECK(parser->buffer, '"') || CHECK(parser->buffer, '%')
1034 || CHECK(parser->buffer, '@') || CHECK(parser->buffer, '`')) ||
1035 (CHECK(parser->buffer, '-') && !IS_BLANK_AT(parser->buffer, 1)) ||
f2b59d4d 1036 (!parser->flow_level &&
e35af832
KS		 1037 (CHECK(parser->buffer, '?') || CHECK(parser->buffer, ':'))
1038 && !IS_BLANKZ_AT(parser->buffer, 1)))
f2b59d4d
KS		 1039 return yaml_parser_fetch_plain_scalar(parser);
1040
1041 /*
1042 * If we don't determine the token type so far, it is an error.
1043 */
1044
625fcfe9
KS		 1045 return yaml_parser_set_scanner_error(parser,
1046 "while scanning for the next token", parser->mark,
1047 "found character that cannot start any token");
f2b59d4d
KS		 1048}
1049
eb9cceb5
KS		 1050/*
1051 * Check the list of potential simple keys and remove the positions that
1052 * cannot contain simple keys anymore.
1053 */
1054
1055static int
1056yaml_parser_stale_simple_keys(yaml_parser_t *parser)
1057{
625fcfe9 1058 yaml_simple_key_t *simple_key;
eb9cceb5
KS		 1059
1060 /* Check for a potential simple key for each flow level. */
1061
625fcfe9
KS		 1062 for (simple_key = parser->simple_keys.start;
1063 simple_key != parser->simple_keys.top; simple_key ++)
eb9cceb5 1064 {
eb9cceb5
KS		 1065 /*
1066 * The specification requires that a simple key
1067 *
1068 * - is limited to a single line,
1069 * - is shorter than 1024 characters.
1070 */
1071
625fcfe9
KS		 1072 if (simple_key->possible
1073 && (simple_key->mark.line < parser->mark.line
1074 || simple_key->mark.index+1024 < parser->mark.index)) {
eb9cceb5
KS		 1075
1076 /* Check if the potential simple key to be removed is required. */
1077
1078 if (simple_key->required) {
1079 return yaml_parser_set_scanner_error(parser,
1080 "while scanning a simple key", simple_key->mark,
6be8109b 1081 "could not find expected ':'");
eb9cceb5
KS		 1082 }
1083
625fcfe9 1084 simple_key->possible = 0;
eb9cceb5
KS		 1085 }
1086 }
1087
1088 return 1;
1089}
1090
1091/*
1092 * Check if a simple key may start at the current position and add it if
1093 * needed.
1094 */
1095
1096static int
1097yaml_parser_save_simple_key(yaml_parser_t *parser)
1098{
1099 /*
1100 * A simple key is required at the current position if the scanner is in
1101 * the block context and the current column coincides with the indentation
1102 * level.
1103 */
1104
625fcfe9 1105 int required = (!parser->flow_level
0174ed6e 1106 && parser->indent == (int)parser->mark.column);
eb9cceb5
KS		 1107
1108 /*
1109 * A simple key is required only when it is the first token in the current
1110 * line. Therefore it is always allowed. But we add a check anyway.
1111 */
1112
1113 assert(parser->simple_key_allowed || !required); /* Impossible. */
1114
1115 /*
1116 * If the current position may start a simple key, save it.
1117 */
1118
1119 if (parser->simple_key_allowed)
1120 {
625fcfe9
KS		 1121 yaml_simple_key_t simple_key = { 1, required,
1122 parser->tokens_parsed + parser->tokens.tail - parser->tokens.head,
0174ed6e
KS		 1123 { 0, 0, 0 } };
1124 simple_key.mark = parser->mark;
eb9cceb5
KS		 1125
1126 if (!yaml_parser_remove_simple_key(parser)) return 0;
1127
625fcfe9 1128 *(parser->simple_keys.top-1) = simple_key;
eb9cceb5
KS		 1129 }
1130
1131 return 1;
1132}
1133
1134/*
1135 * Remove a potential simple key at the current flow level.
1136 */
1137
1138static int
1139yaml_parser_remove_simple_key(yaml_parser_t *parser)
1140{
625fcfe9 1141 yaml_simple_key_t *simple_key = parser->simple_keys.top-1;
eb9cceb5 1142
625fcfe9 1143 if (simple_key->possible)
eb9cceb5
KS		 1144 {
1145 /* If the key is required, it is an error. */
1146
1147 if (simple_key->required) {
1148 return yaml_parser_set_scanner_error(parser,
1149 "while scanning a simple key", simple_key->mark,
6be8109b 1150 "could not find expected ':'");
eb9cceb5 1151 }
625fcfe9 1152 }
eb9cceb5 1153
625fcfe9 1154 /* Remove the key from the stack. */
eb9cceb5 1155
625fcfe9 1156 simple_key->possible = 0;
eb9cceb5
KS		 1157
1158 return 1;
1159}
1160
1161/*
1162 * Increase the flow level and resize the simple key list if needed.
1163 */
1164
1165static int
1166yaml_parser_increase_flow_level(yaml_parser_t *parser)
1167{
625fcfe9 1168 yaml_simple_key_t empty_simple_key = { 0, 0, 0, { 0, 0, 0 } };
eb9cceb5 1169
625fcfe9 1170 /* Reset the simple key on the next level. */
eb9cceb5 1171
625fcfe9
KS		 1172 if (!PUSH(parser, parser->simple_keys, empty_simple_key))
1173 return 0;
1174
1175 /* Increase the flow level. */
eb9cceb5 1176
625fcfe9 1177 parser->flow_level++;
eb9cceb5
KS		 1178
1179 return 1;
1180}
1181
1182/*
1183 * Decrease the flow level.
1184 */
1185
1186static int
1187yaml_parser_decrease_flow_level(yaml_parser_t *parser)
1188{
c9b74def
KS		 1189 yaml_simple_key_t dummy_key; /* Used to eliminate a compiler warning. */
1190
625fcfe9
KS		 1191 if (parser->flow_level) {
1192 parser->flow_level --;
c9b74def 1193 dummy_key = POP(parser, parser->simple_keys);
eb9cceb5
KS		 1194 }
1195
eb9cceb5
KS		 1196 return 1;
1197}
1198
1199/*
1200 * Push the current indentation level to the stack and set the new level
1201 * the current column is greater than the indentation level. In this case,
1202 * append or insert the specified token into the token queue.
1203 *
1204 */
1205
1206static int
1207yaml_parser_roll_indent(yaml_parser_t *parser, int column,
1208 int number, yaml_token_type_t type, yaml_mark_t mark)
1209{
625fcfe9 1210 yaml_token_t token;
eb9cceb5
KS		 1211
1212 /* In the flow context, do nothing. */
1213
1214 if (parser->flow_level)
1215 return 1;
1216
1217 if (parser->indent < column)
1218 {
eb9cceb5
KS		 1219 /*
1220 * Push the current indentation level to the stack and set the new
1221 * indentation level.
1222 */
1223
625fcfe9
KS		 1224 if (!PUSH(parser, parser->indents, parser->indent))
1225 return 0;
1226
eb9cceb5
KS		 1227 parser->indent = column;
1228
625fcfe9 1229 /* Create a token and insert it into the queue. */
eb9cceb5 1230
625fcfe9 1231 TOKEN_INIT(token, type, mark, mark);
eb9cceb5 1232
625fcfe9
KS		 1233 if (number == -1) {
1234 if (!ENQUEUE(parser, parser->tokens, token))
1235 return 0;
1236 }
1237 else {
1238 if (!QUEUE_INSERT(parser,
1239 parser->tokens, number - parser->tokens_parsed, token))
1240 return 0;
eb9cceb5
KS		 1241 }
1242 }
1243
1244 return 1;
1245}
1246
1247/*
1248 * Pop indentation levels from the indents stack until the current level
1249 * becomes less or equal to the column. For each intendation level, append
1250 * the BLOCK-END token.
1251 */
1252
1253
1254static int
1255yaml_parser_unroll_indent(yaml_parser_t *parser, int column)
1256{
625fcfe9 1257 yaml_token_t token;
eb9cceb5
KS		 1258
1259 /* In the flow context, do nothing. */
1260
1261 if (parser->flow_level)
1262 return 1;
1263
1264 /* Loop through the intendation levels in the stack. */
1265
1266 while (parser->indent > column)
1267 {
625fcfe9 1268 /* Create a token and append it to the queue. */
eb9cceb5 1269
625fcfe9 1270 TOKEN_INIT(token, YAML_BLOCK_END_TOKEN, parser->mark, parser->mark);
eb9cceb5 1271
625fcfe9 1272 if (!ENQUEUE(parser, parser->tokens, token))
eb9cceb5 1273 return 0;
eb9cceb5
KS		 1274
1275 /* Pop the indentation level. */
1276
625fcfe9 1277 parser->indent = POP(parser, parser->indents);
eb9cceb5
KS		 1278 }
1279
1280 return 1;
1281}
1282
1283/*
1284 * Initialize the scanner and produce the STREAM-START token.
1285 */
1286
1287static int
1288yaml_parser_fetch_stream_start(yaml_parser_t *parser)
1289{
625fcfe9
KS		 1290 yaml_simple_key_t simple_key = { 0, 0, 0, { 0, 0, 0 } };
1291 yaml_token_t token;
eb9cceb5
KS		 1292
1293 /* Set the initial indentation. */
1294
1295 parser->indent = -1;
1296
625fcfe9
KS		 1297 /* Initialize the simple key stack. */
1298
1299 if (!PUSH(parser, parser->simple_keys, simple_key))
1300 return 0;
1301
eb9cceb5
KS		 1302 /* A simple key is allowed at the beginning of the stream. */
1303
1304 parser->simple_key_allowed = 1;
1305
1306 /* We have started. */
1307
1308 parser->stream_start_produced = 1;
1309
625fcfe9 1310 /* Create the STREAM-START token and append it to the queue. */
eb9cceb5 1311
625fcfe9
KS		 1312 STREAM_START_TOKEN_INIT(token, parser->encoding,
1313 parser->mark, parser->mark);
eb9cceb5 1314
625fcfe9 1315 if (!ENQUEUE(parser, parser->tokens, token))
eb9cceb5 1316 return 0;
eb9cceb5
KS		 1317
1318 return 1;
1319}
1320
1321/*
1322 * Produce the STREAM-END token and shut down the scanner.
1323 */
1324
1325static int
1326yaml_parser_fetch_stream_end(yaml_parser_t *parser)
1327{
625fcfe9 1328 yaml_token_t token;
eb9cceb5 1329
c83b67a6
KS		 1330 /* Force new line. */
1331
1332 if (parser->mark.column != 0) {
1333 parser->mark.column = 0;
1334 parser->mark.line ++;
1335 }
1336
eb9cceb5
KS		 1337 /* Reset the indentation level. */
1338
1339 if (!yaml_parser_unroll_indent(parser, -1))
1340 return 0;
1341
7e32c194 1342 /* Reset simple keys. */
eb9cceb5 1343
7e32c194
KS		 1344 if (!yaml_parser_remove_simple_key(parser))
1345 return 0;
1346
1347 parser->simple_key_allowed = 0;
eb9cceb5 1348
625fcfe9 1349 /* Create the STREAM-END token and append it to the queue. */
eb9cceb5 1350
625fcfe9 1351 STREAM_END_TOKEN_INIT(token, parser->mark, parser->mark);
eb9cceb5 1352
625fcfe9 1353 if (!ENQUEUE(parser, parser->tokens, token))
eb9cceb5 1354 return 0;
eb9cceb5
KS		 1355
1356 return 1;
1357}
1358
1359/*
625fcfe9 1360 * Produce a VERSION-DIRECTIVE or TAG-DIRECTIVE token.
eb9cceb5
KS		 1361 */
1362
1363static int
1364yaml_parser_fetch_directive(yaml_parser_t *parser)
1365{
625fcfe9 1366 yaml_token_t token;
eb9cceb5
KS		 1367
1368 /* Reset the indentation level. */
1369
1370 if (!yaml_parser_unroll_indent(parser, -1))
1371 return 0;
1372
1373 /* Reset simple keys. */
1374
1375 if (!yaml_parser_remove_simple_key(parser))
1376 return 0;
1377
1378 parser->simple_key_allowed = 0;
1379
1380 /* Create the YAML-DIRECTIVE or TAG-DIRECTIVE token. */
1381
625fcfe9
KS		 1382 if (!yaml_parser_scan_directive(parser, &token))
1383 return 0;
eb9cceb5
KS		 1384
1385 /* Append the token to the queue. */
1386
625fcfe9
KS		 1387 if (!ENQUEUE(parser, parser->tokens, token)) {
1388 yaml_token_delete(&token);
eb9cceb5
KS		 1389 return 0;
1390 }
1391
1392 return 1;
1393}
1394
1395/*
1396 * Produce the DOCUMENT-START or DOCUMENT-END token.
1397 */
1398
1399static int
1400yaml_parser_fetch_document_indicator(yaml_parser_t *parser,
1401 yaml_token_type_t type)
1402{
1403 yaml_mark_t start_mark, end_mark;
625fcfe9 1404 yaml_token_t token;
eb9cceb5
KS		 1405
1406 /* Reset the indentation level. */
1407
1408 if (!yaml_parser_unroll_indent(parser, -1))
1409 return 0;
1410
1411 /* Reset simple keys. */
1412
1413 if (!yaml_parser_remove_simple_key(parser))
1414 return 0;
1415
1416 parser->simple_key_allowed = 0;
1417
1418 /* Consume the token. */
1419
625fcfe9 1420 start_mark = parser->mark;
eb9cceb5 1421
625fcfe9
KS		 1422 SKIP(parser);
1423 SKIP(parser);
1424 SKIP(parser);
eb9cceb5 1425
625fcfe9 1426 end_mark = parser->mark;
eb9cceb5
KS		 1427
1428 /* Create the DOCUMENT-START or DOCUMENT-END token. */
1429
625fcfe9 1430 TOKEN_INIT(token, type, start_mark, end_mark);
eb9cceb5
KS		 1431
1432 /* Append the token to the queue. */
1433
625fcfe9 1434 if (!ENQUEUE(parser, parser->tokens, token))
eb9cceb5 1435 return 0;
eb9cceb5
KS		 1436
1437 return 1;
1438}
1439
1440/*
1441 * Produce the FLOW-SEQUENCE-START or FLOW-MAPPING-START token.
1442 */
1443
1444static int
1445yaml_parser_fetch_flow_collection_start(yaml_parser_t *parser,
1446 yaml_token_type_t type)
1447{
1448 yaml_mark_t start_mark, end_mark;
625fcfe9 1449 yaml_token_t token;
eb9cceb5
KS		 1450
1451 /* The indicators '[' and '{' may start a simple key. */
1452
1453 if (!yaml_parser_save_simple_key(parser))
1454 return 0;
1455
1456 /* Increase the flow level. */
1457
1458 if (!yaml_parser_increase_flow_level(parser))
1459 return 0;
1460
1461 /* A simple key may follow the indicators '[' and '{'. */
1462
1463 parser->simple_key_allowed = 1;
1464
1465 /* Consume the token. */
1466
625fcfe9
KS		 1467 start_mark = parser->mark;
1468 SKIP(parser);
1469 end_mark = parser->mark;
eb9cceb5
KS		 1470
1471 /* Create the FLOW-SEQUENCE-START of FLOW-MAPPING-START token. */
1472
625fcfe9 1473 TOKEN_INIT(token, type, start_mark, end_mark);
eb9cceb5
KS		 1474
1475 /* Append the token to the queue. */
1476
625fcfe9 1477 if (!ENQUEUE(parser, parser->tokens, token))
eb9cceb5 1478 return 0;
eb9cceb5
KS		 1479
1480 return 1;
1481}
1482
1483/*
1484 * Produce the FLOW-SEQUENCE-END or FLOW-MAPPING-END token.
1485 */
1486
1487static int
1488yaml_parser_fetch_flow_collection_end(yaml_parser_t *parser,
1489 yaml_token_type_t type)
1490{
1491 yaml_mark_t start_mark, end_mark;
625fcfe9 1492 yaml_token_t token;
eb9cceb5
KS		 1493
1494 /* Reset any potential simple key on the current flow level. */
1495
1496 if (!yaml_parser_remove_simple_key(parser))
1497 return 0;
1498
1499 /* Decrease the flow level. */
1500
1501 if (!yaml_parser_decrease_flow_level(parser))
1502 return 0;
1503
1504 /* No simple keys after the indicators ']' and '}'. */
1505
1506 parser->simple_key_allowed = 0;
1507
1508 /* Consume the token. */
1509
625fcfe9
KS		 1510 start_mark = parser->mark;
1511 SKIP(parser);
1512 end_mark = parser->mark;
eb9cceb5
KS		 1513
1514 /* Create the FLOW-SEQUENCE-END of FLOW-MAPPING-END token. */
1515
625fcfe9 1516 TOKEN_INIT(token, type, start_mark, end_mark);
eb9cceb5
KS		 1517
1518 /* Append the token to the queue. */
1519
625fcfe9 1520 if (!ENQUEUE(parser, parser->tokens, token))
eb9cceb5 1521 return 0;
eb9cceb5
KS		 1522
1523 return 1;
1524}
1525
1526/*
1527 * Produce the FLOW-ENTRY token.
1528 */
1529
1530static int
1531yaml_parser_fetch_flow_entry(yaml_parser_t *parser)
1532{
1533 yaml_mark_t start_mark, end_mark;
625fcfe9 1534 yaml_token_t token;
eb9cceb5
KS		 1535
1536 /* Reset any potential simple keys on the current flow level. */
1537
1538 if (!yaml_parser_remove_simple_key(parser))
1539 return 0;
1540
1541 /* Simple keys are allowed after ','. */
1542
1543 parser->simple_key_allowed = 1;
1544
1545 /* Consume the token. */
1546
625fcfe9
KS		 1547 start_mark = parser->mark;
1548 SKIP(parser);
1549 end_mark = parser->mark;
eb9cceb5 1550
625fcfe9 1551 /* Create the FLOW-ENTRY token and append it to the queue. */
eb9cceb5 1552
625fcfe9 1553 TOKEN_INIT(token, YAML_FLOW_ENTRY_TOKEN, start_mark, end_mark);
eb9cceb5 1554
625fcfe9 1555 if (!ENQUEUE(parser, parser->tokens, token))
eb9cceb5 1556 return 0;
eb9cceb5
KS		 1557
1558 return 1;
1559}
1560
1561/*
1562 * Produce the BLOCK-ENTRY token.
1563 */
1564
1565static int
1566yaml_parser_fetch_block_entry(yaml_parser_t *parser)
1567{
1568 yaml_mark_t start_mark, end_mark;
625fcfe9 1569 yaml_token_t token;
eb9cceb5
KS		 1570
1571 /* Check if the scanner is in the block context. */
1572
1573 if (!parser->flow_level)
1574 {
1575 /* Check if we are allowed to start a new entry. */
1576
1577 if (!parser->simple_key_allowed) {
625fcfe9 1578 return yaml_parser_set_scanner_error(parser, NULL, parser->mark,
eb9cceb5
KS		 1579 "block sequence entries are not allowed in this context");
1580 }
1581
1582 /* Add the BLOCK-SEQUENCE-START token if needed. */
1583
625fcfe9
KS		 1584 if (!yaml_parser_roll_indent(parser, parser->mark.column, -1,
1585 YAML_BLOCK_SEQUENCE_START_TOKEN, parser->mark))
eb9cceb5
KS		 1586 return 0;
1587 }
1588 else
1589 {
1590 /*
1591 * It is an error for the '-' indicator to occur in the flow context,
1592 * but we let the Parser detect and report about it because the Parser
1593 * is able to point to the context.
1594 */
1595 }
1596
1597 /* Reset any potential simple keys on the current flow level. */
1598
1599 if (!yaml_parser_remove_simple_key(parser))
1600 return 0;
1601
1602 /* Simple keys are allowed after '-'. */
1603
1604 parser->simple_key_allowed = 1;
1605
1606 /* Consume the token. */
1607
625fcfe9
KS		 1608 start_mark = parser->mark;
1609 SKIP(parser);
1610 end_mark = parser->mark;
eb9cceb5 1611
625fcfe9 1612 /* Create the BLOCK-ENTRY token and append it to the queue. */
eb9cceb5 1613
625fcfe9 1614 TOKEN_INIT(token, YAML_BLOCK_ENTRY_TOKEN, start_mark, end_mark);
eb9cceb5 1615
625fcfe9 1616 if (!ENQUEUE(parser, parser->tokens, token))
eb9cceb5 1617 return 0;
eb9cceb5
KS		 1618
1619 return 1;
1620}
1621
1622/*
1623 * Produce the KEY token.
1624 */
1625
1626static int
1627yaml_parser_fetch_key(yaml_parser_t *parser)
1628{
1629 yaml_mark_t start_mark, end_mark;
625fcfe9 1630 yaml_token_t token;
eb9cceb5
KS		 1631
1632 /* In the block context, additional checks are required. */
1633
1634 if (!parser->flow_level)
1635 {
1636 /* Check if we are allowed to start a new key (not nessesary simple). */
1637
1638 if (!parser->simple_key_allowed) {
625fcfe9 1639 return yaml_parser_set_scanner_error(parser, NULL, parser->mark,
eb9cceb5
KS		 1640 "mapping keys are not allowed in this context");
1641 }
1642
1643 /* Add the BLOCK-MAPPING-START token if needed. */
1644
625fcfe9
KS		 1645 if (!yaml_parser_roll_indent(parser, parser->mark.column, -1,
1646 YAML_BLOCK_MAPPING_START_TOKEN, parser->mark))
eb9cceb5
KS		 1647 return 0;
1648 }
1649
1650 /* Reset any potential simple keys on the current flow level. */
1651
1652 if (!yaml_parser_remove_simple_key(parser))
1653 return 0;
1654
1655 /* Simple keys are allowed after '?' in the block context. */
1656
1657 parser->simple_key_allowed = (!parser->flow_level);
1658
1659 /* Consume the token. */
1660
625fcfe9
KS		 1661 start_mark = parser->mark;
1662 SKIP(parser);
1663 end_mark = parser->mark;
eb9cceb5 1664
625fcfe9 1665 /* Create the KEY token and append it to the queue. */
eb9cceb5 1666
625fcfe9 1667 TOKEN_INIT(token, YAML_KEY_TOKEN, start_mark, end_mark);
eb9cceb5 1668
625fcfe9 1669 if (!ENQUEUE(parser, parser->tokens, token))
eb9cceb5 1670 return 0;
eb9cceb5
KS		 1671
1672 return 1;
1673}
1674
1675/*
1676 * Produce the VALUE token.
1677 */
1678
1679static int
1680yaml_parser_fetch_value(yaml_parser_t *parser)
1681{
1682 yaml_mark_t start_mark, end_mark;
625fcfe9
KS		 1683 yaml_token_t token;
1684 yaml_simple_key_t *simple_key = parser->simple_keys.top-1;
eb9cceb5
KS		 1685
1686 /* Have we found a simple key? */
1687
625fcfe9 1688 if (simple_key->possible)
eb9cceb5 1689 {
eb9cceb5 1690
625fcfe9 1691 /* Create the KEY token and insert it into the queue. */
eb9cceb5 1692
625fcfe9 1693 TOKEN_INIT(token, YAML_KEY_TOKEN, simple_key->mark, simple_key->mark);
eb9cceb5 1694
625fcfe9
KS		 1695 if (!QUEUE_INSERT(parser, parser->tokens,
1696 simple_key->token_number - parser->tokens_parsed, token))
eb9cceb5 1697 return 0;
eb9cceb5
KS		 1698
1699 /* In the block context, we may need to add the BLOCK-MAPPING-START token. */
1700
625fcfe9 1701 if (!yaml_parser_roll_indent(parser, simple_key->mark.column,
eb9cceb5
KS		 1702 simple_key->token_number,
1703 YAML_BLOCK_MAPPING_START_TOKEN, simple_key->mark))
1704 return 0;
1705
625fcfe9 1706 /* Remove the simple key. */
eb9cceb5 1707
625fcfe9 1708 simple_key->possible = 0;
eb9cceb5
KS		 1709
1710 /* A simple key cannot follow another simple key. */
1711
1712 parser->simple_key_allowed = 0;
1713 }
1714 else
1715 {
1716 /* The ':' indicator follows a complex key. */
1717
1718 /* In the block context, extra checks are required. */
1719
1720 if (!parser->flow_level)
1721 {
1722 /* Check if we are allowed to start a complex value. */
1723
1724 if (!parser->simple_key_allowed) {
625fcfe9 1725 return yaml_parser_set_scanner_error(parser, NULL, parser->mark,
eb9cceb5
KS		 1726 "mapping values are not allowed in this context");
1727 }
1728
1729 /* Add the BLOCK-MAPPING-START token if needed. */
1730
625fcfe9
KS		 1731 if (!yaml_parser_roll_indent(parser, parser->mark.column, -1,
1732 YAML_BLOCK_MAPPING_START_TOKEN, parser->mark))
eb9cceb5
KS		 1733 return 0;
1734 }
1735
eb9cceb5
KS		 1736 /* Simple keys after ':' are allowed in the block context. */
1737
1738 parser->simple_key_allowed = (!parser->flow_level);
1739 }
1740
1741 /* Consume the token. */
1742
625fcfe9
KS		 1743 start_mark = parser->mark;
1744 SKIP(parser);
1745 end_mark = parser->mark;
eb9cceb5 1746
625fcfe9 1747 /* Create the VALUE token and append it to the queue. */
eb9cceb5 1748
625fcfe9 1749 TOKEN_INIT(token, YAML_VALUE_TOKEN, start_mark, end_mark);
eb9cceb5 1750
625fcfe9 1751 if (!ENQUEUE(parser, parser->tokens, token))
eb9cceb5 1752 return 0;
eb9cceb5
KS		 1753
1754 return 1;
1755}
1756
1757/*
1758 * Produce the ALIAS or ANCHOR token.
1759 */
1760
1761static int
1762yaml_parser_fetch_anchor(yaml_parser_t *parser, yaml_token_type_t type)
1763{
625fcfe9 1764 yaml_token_t token;
eb9cceb5
KS		 1765
1766 /* An anchor or an alias could be a simple key. */
1767
1768 if (!yaml_parser_save_simple_key(parser))
1769 return 0;
1770
1771 /* A simple key cannot follow an anchor or an alias. */
1772
1773 parser->simple_key_allowed = 0;
1774
625fcfe9 1775 /* Create the ALIAS or ANCHOR token and append it to the queue. */
eb9cceb5 1776
625fcfe9
KS		 1777 if (!yaml_parser_scan_anchor(parser, &token, type))
1778 return 0;
eb9cceb5 1779
625fcfe9
KS		 1780 if (!ENQUEUE(parser, parser->tokens, token)) {
1781 yaml_token_delete(&token);
eb9cceb5
KS		 1782 return 0;
1783 }
eb9cceb5
KS		 1784 return 1;
1785}
1786
1787/*
1788 * Produce the TAG token.
1789 */
1790
1791static int
1792yaml_parser_fetch_tag(yaml_parser_t *parser)
1793{
625fcfe9 1794 yaml_token_t token;
eb9cceb5
KS		 1795
1796 /* A tag could be a simple key. */
1797
1798 if (!yaml_parser_save_simple_key(parser))
1799 return 0;
1800
1801 /* A simple key cannot follow a tag. */
1802
1803 parser->simple_key_allowed = 0;
1804
625fcfe9 1805 /* Create the TAG token and append it to the queue. */
eb9cceb5 1806
625fcfe9
KS		 1807 if (!yaml_parser_scan_tag(parser, &token))
1808 return 0;
eb9cceb5 1809
625fcfe9
KS		 1810 if (!ENQUEUE(parser, parser->tokens, token)) {
1811 yaml_token_delete(&token);
eb9cceb5
KS		 1812 return 0;
1813 }
1814
1815 return 1;
1816}
1817
1818/*
1819 * Produce the SCALAR(...,literal) or SCALAR(...,folded) tokens.
1820 */
1821
1822static int
1823yaml_parser_fetch_block_scalar(yaml_parser_t *parser, int literal)
1824{
625fcfe9 1825 yaml_token_t token;
eb9cceb5
KS		 1826
1827 /* Remove any potential simple keys. */
1828
1829 if (!yaml_parser_remove_simple_key(parser))
1830 return 0;
1831
1832 /* A simple key may follow a block scalar. */
1833
1834 parser->simple_key_allowed = 1;
1835
625fcfe9 1836 /* Create the SCALAR token and append it to the queue. */
eb9cceb5 1837
625fcfe9
KS		 1838 if (!yaml_parser_scan_block_scalar(parser, &token, literal))
1839 return 0;
eb9cceb5 1840
625fcfe9
KS		 1841 if (!ENQUEUE(parser, parser->tokens, token)) {
1842 yaml_token_delete(&token);
eb9cceb5
KS		 1843 return 0;
1844 }
1845
1846 return 1;
1847}
1848
1849/*
1850 * Produce the SCALAR(...,single-quoted) or SCALAR(...,double-quoted) tokens.
1851 */
1852
1853static int
1854yaml_parser_fetch_flow_scalar(yaml_parser_t *parser, int single)
1855{
625fcfe9 1856 yaml_token_t token;
eb9cceb5
KS		 1857
1858 /* A plain scalar could be a simple key. */
1859
1860 if (!yaml_parser_save_simple_key(parser))
1861 return 0;
1862
1863 /* A simple key cannot follow a flow scalar. */
1864
1865 parser->simple_key_allowed = 0;
1866
625fcfe9 1867 /* Create the SCALAR token and append it to the queue. */
eb9cceb5 1868
625fcfe9
KS		 1869 if (!yaml_parser_scan_flow_scalar(parser, &token, single))
1870 return 0;
eb9cceb5 1871
625fcfe9
KS		 1872 if (!ENQUEUE(parser, parser->tokens, token)) {
1873 yaml_token_delete(&token);
eb9cceb5
KS		 1874 return 0;
1875 }
1876
1877 return 1;
1878}
1879
1880/*
1881 * Produce the SCALAR(...,plain) token.
1882 */
1883
1884static int
1885yaml_parser_fetch_plain_scalar(yaml_parser_t *parser)
1886{
625fcfe9 1887 yaml_token_t token;
eb9cceb5
KS		 1888
1889 /* A plain scalar could be a simple key. */
1890
1891 if (!yaml_parser_save_simple_key(parser))
1892 return 0;
1893
1894 /* A simple key cannot follow a flow scalar. */
1895
1896 parser->simple_key_allowed = 0;
1897
625fcfe9 1898 /* Create the SCALAR token and append it to the queue. */
eb9cceb5 1899
625fcfe9
KS		 1900 if (!yaml_parser_scan_plain_scalar(parser, &token))
1901 return 0;
eb9cceb5 1902
625fcfe9
KS		 1903 if (!ENQUEUE(parser, parser->tokens, token)) {
1904 yaml_token_delete(&token);
eb9cceb5
KS		 1905 return 0;
1906 }
1907
1908 return 1;
1909}
1910
e71095e3
KS		 1911/*
1912 * Eat whitespaces and comments until the next token is found.
1913 */
1914
1915static int
1916yaml_parser_scan_to_next_token(yaml_parser_t *parser)
1917{
1918 /* Until the next token is not found. */
1919
1920 while (1)
1921 {
1922 /* Allow the BOM mark to start a line. */
1923
625fcfe9 1924 if (!CACHE(parser, 1)) return 0;
e71095e3 1925
e35af832 1926 if (parser->mark.column == 0 && IS_BOM(parser->buffer))
625fcfe9 1927 SKIP(parser);
e71095e3
KS		 1928
1929 /*
1930 * Eat whitespaces.
1931 *
1932 * Tabs are allowed:
1933 *
1934 * - in the flow context;
1935 * - in the block context, but not at the beginning of the line or
1936 * after '-', '?', or ':' (complex value).
1937 */
1938
625fcfe9 1939 if (!CACHE(parser, 1)) return 0;
e71095e3 1940
e35af832 1941 while (CHECK(parser->buffer,' ') ||
e71095e3 1942 ((parser->flow_level || !parser->simple_key_allowed) &&
e35af832 1943 CHECK(parser->buffer, '\t'))) {
625fcfe9
KS		 1944 SKIP(parser);
1945 if (!CACHE(parser, 1)) return 0;
e71095e3
KS		 1946 }
1947
1948 /* Eat a comment until a line break. */
1949
e35af832
KS		 1950 if (CHECK(parser->buffer, '#')) {
1951 while (!IS_BREAKZ(parser->buffer)) {
625fcfe9
KS		 1952 SKIP(parser);
1953 if (!CACHE(parser, 1)) return 0;
e71095e3
KS		 1954 }
1955 }
1956
1957 /* If it is a line break, eat it. */
1958
e35af832 1959 if (IS_BREAK(parser->buffer))
e71095e3 1960 {
625fcfe9
KS		 1961 if (!CACHE(parser, 2)) return 0;
1962 SKIP_LINE(parser);
e71095e3
KS		 1963
1964 /* In the block context, a new line may start a simple key. */
1965
1966 if (!parser->flow_level) {
1967 parser->simple_key_allowed = 1;
1968 }
1969 }
1970 else
1971 {
1972 /* We have found a token. */
1973
1974 break;
1975 }
1976 }
1977
1978 return 1;
1979}
1980
1981/*
1982 * Scan a YAML-DIRECTIVE or TAG-DIRECTIVE token.
1983 *
1984 * Scope:
1985 * %YAML 1.1 # a comment \n
1986 * ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
1987 * %TAG !yaml! tag:yaml.org,2002: \n
1988 * ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
1989 */
1990
625fcfe9
KS		 1991int
1992yaml_parser_scan_directive(yaml_parser_t *parser, yaml_token_t *token)
e71095e3
KS		 1993{
1994 yaml_mark_t start_mark, end_mark;
1995 yaml_char_t *name = NULL;
1996 int major, minor;
1997 yaml_char_t *handle = NULL, *prefix = NULL;
e71095e3
KS		 1998
1999 /* Eat '%'. */
2000
625fcfe9 2001 start_mark = parser->mark;
e71095e3 2002
625fcfe9 2003 SKIP(parser);
e71095e3
KS		 2004
2005 /* Scan the directive name. */
2006
2007 if (!yaml_parser_scan_directive_name(parser, start_mark, &name))
2008 goto error;
2009
2010 /* Is it a YAML directive? */
2011
2012 if (strcmp((char *)name, "YAML") == 0)
2013 {
2014 /* Scan the VERSION directive value. */
2015
2016 if (!yaml_parser_scan_version_directive_value(parser, start_mark,
2017 &major, &minor))
2018 goto error;
2019
625fcfe9 2020 end_mark = parser->mark;
e71095e3
KS		 2021
2022 /* Create a VERSION-DIRECTIVE token. */
2023
625fcfe9 2024 VERSION_DIRECTIVE_TOKEN_INIT(*token, major, minor,
e71095e3 2025 start_mark, end_mark);
e71095e3
KS		 2026 }
2027
2028 /* Is it a TAG directive? */
2029
2030 else if (strcmp((char *)name, "TAG") == 0)
2031 {
2032 /* Scan the TAG directive value. */
2033
2034 if (!yaml_parser_scan_tag_directive_value(parser, start_mark,
2035 &handle, &prefix))
2036 goto error;
2037
625fcfe9 2038 end_mark = parser->mark;
e71095e3
KS		 2039
2040 /* Create a TAG-DIRECTIVE token. */
2041
625fcfe9 2042 TAG_DIRECTIVE_TOKEN_INIT(*token, handle, prefix,
e71095e3 2043 start_mark, end_mark);
e71095e3
KS		 2044 }
2045
2046 /* Unknown directive. */
2047
2048 else
2049 {
92d41fe1 2050 yaml_parser_set_scanner_error(parser, "while scanning a directive",
e71095e3
KS		 2051 start_mark, "found uknown directive name");
2052 goto error;
2053 }
2054
2055 /* Eat the rest of the line including any comments. */
2056
625fcfe9
KS		 2057 if (!CACHE(parser, 1)) goto error;
2058
e35af832 2059 while (IS_BLANK(parser->buffer)) {
625fcfe9
KS		 2060 SKIP(parser);
2061 if (!CACHE(parser, 1)) goto error;
e71095e3
KS		 2062 }
2063
e35af832
KS		 2064 if (CHECK(parser->buffer, '#')) {
2065 while (!IS_BREAKZ(parser->buffer)) {
625fcfe9
KS		 2066 SKIP(parser);
2067 if (!CACHE(parser, 1)) goto error;
e71095e3
KS		 2068 }
2069 }
2070
2071 /* Check if we are at the end of the line. */
2072
e35af832 2073 if (!IS_BREAKZ(parser->buffer)) {
92d41fe1 2074 yaml_parser_set_scanner_error(parser, "while scanning a directive",
6be8109b 2075 start_mark, "did not find expected comment or line break");
e71095e3
KS		 2076 goto error;
2077 }
2078
2079 /* Eat a line break. */
2080
e35af832 2081 if (IS_BREAK(parser->buffer)) {
625fcfe9
KS		 2082 if (!CACHE(parser, 2)) goto error;
2083 SKIP_LINE(parser);
e71095e3
KS		 2084 }
2085
2086 yaml_free(name);
2087
625fcfe9 2088 return 1;
e71095e3
KS		 2089
2090error:
e71095e3
KS		 2091 yaml_free(prefix);
2092 yaml_free(handle);
2093 yaml_free(name);
625fcfe9 2094 return 0;
e71095e3
KS		 2095}
2096
2097/*
2098 * Scan the directive name.
2099 *
2100 * Scope:
2101 * %YAML 1.1 # a comment \n
2102 * ^^^^
2103 * %TAG !yaml! tag:yaml.org,2002: \n
2104 * ^^^
2105 */
2106
2107static int
2108yaml_parser_scan_directive_name(yaml_parser_t *parser,
2109 yaml_mark_t start_mark, yaml_char_t **name)
2110{
625fcfe9 2111 yaml_string_t string = NULL_STRING;
e71095e3 2112
625fcfe9 2113 if (!STRING_INIT(parser, string, INITIAL_STRING_SIZE)) goto error;
e71095e3
KS		 2114
2115 /* Consume the directive name. */
2116
625fcfe9 2117 if (!CACHE(parser, 1)) goto error;
e71095e3 2118
e35af832 2119 while (IS_ALPHA(parser->buffer))
e71095e3 2120 {
625fcfe9
KS		 2121 if (!READ(parser, string)) goto error;
2122 if (!CACHE(parser, 1)) goto error;
e71095e3
KS		 2123 }
2124
2125 /* Check if the name is empty. */
2126
625fcfe9 2127 if (string.start == string.pointer) {
e71095e3 2128 yaml_parser_set_scanner_error(parser, "while scanning a directive",
6be8109b 2129 start_mark, "could not find expected directive name");
e71095e3
KS		 2130 goto error;
2131 }
2132
2133 /* Check for an blank character after the name. */
2134
e35af832 2135 if (!IS_BLANKZ(parser->buffer)) {
e71095e3
KS		 2136 yaml_parser_set_scanner_error(parser, "while scanning a directive",
2137 start_mark, "found unexpected non-alphabetical character");
2138 goto error;
2139 }
2140
625fcfe9 2141 *name = string.start;
e71095e3
KS		 2142
2143 return 1;
2144
2145error:
625fcfe9 2146 STRING_DEL(parser, string);
e71095e3
KS		 2147 return 0;
2148}
2149
2150/*
2151 * Scan the value of VERSION-DIRECTIVE.
2152 *
2153 * Scope:
2154 * %YAML 1.1 # a comment \n
2155 * ^^^^^^
2156 */
2157
2158static int
2159yaml_parser_scan_version_directive_value(yaml_parser_t *parser,
2160 yaml_mark_t start_mark, int *major, int *minor)
2161{
2162 /* Eat whitespaces. */
2163
625fcfe9 2164 if (!CACHE(parser, 1)) return 0;
e71095e3 2165
e35af832 2166 while (IS_BLANK(parser->buffer)) {
625fcfe9
KS		 2167 SKIP(parser);
2168 if (!CACHE(parser, 1)) return 0;
e71095e3
KS		 2169 }
2170
2171 /* Consume the major version number. */
2172
2173 if (!yaml_parser_scan_version_directive_number(parser, start_mark, major))
2174 return 0;
2175
2176 /* Eat '.'. */
2177
e35af832 2178 if (!CHECK(parser->buffer, '.')) {
e71095e3
KS		 2179 return yaml_parser_set_scanner_error(parser, "while scanning a %YAML directive",
2180 start_mark, "did not find expected digit or '.' character");
2181 }
2182
625fcfe9 2183 SKIP(parser);
e71095e3
KS		 2184
2185 /* Consume the minor version number. */
2186
2187 if (!yaml_parser_scan_version_directive_number(parser, start_mark, minor))
2188 return 0;
ab01bac8
KS		 2189
2190 return 1;
e71095e3
KS		 2191}
2192
2193#define MAX_NUMBER_LENGTH 9
2194
2195/*
2196 * Scan the version number of VERSION-DIRECTIVE.
2197 *
2198 * Scope:
2199 * %YAML 1.1 # a comment \n
2200 * ^
2201 * %YAML 1.1 # a comment \n
2202 * ^
2203 */
2204
2205static int
2206yaml_parser_scan_version_directive_number(yaml_parser_t *parser,
2207 yaml_mark_t start_mark, int *number)
2208{
2209 int value = 0;
2210 size_t length = 0;
2211
2212 /* Repeat while the next character is digit. */
2213
625fcfe9 2214 if (!CACHE(parser, 1)) return 0;
e71095e3 2215
e35af832 2216 while (IS_DIGIT(parser->buffer))
e71095e3
KS		 2217 {
2218 /* Check if the number is too long. */
2219
2220 if (++length > MAX_NUMBER_LENGTH) {
2221 return yaml_parser_set_scanner_error(parser, "while scanning a %YAML directive",
2222 start_mark, "found extremely long version number");
2223 }
2224
e35af832 2225 value = value*10 + AS_DIGIT(parser->buffer);
e71095e3 2226
625fcfe9 2227 SKIP(parser);
e71095e3 2228
625fcfe9 2229 if (!CACHE(parser, 1)) return 0;
e71095e3
KS		 2230 }
2231
2232 /* Check if the number was present. */
2233
2234 if (!length) {
2235 return yaml_parser_set_scanner_error(parser, "while scanning a %YAML directive",
2236 start_mark, "did not find expected version number");
2237 }
2238
2239 *number = value;
2240
2241 return 1;
2242}
2243
2244/*
2245 * Scan the value of a TAG-DIRECTIVE token.
2246 *
2247 * Scope:
2248 * %TAG !yaml! tag:yaml.org,2002: \n
2249 * ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
2250 */
2251
2252static int
2253yaml_parser_scan_tag_directive_value(yaml_parser_t *parser,
2254 yaml_mark_t start_mark, yaml_char_t **handle, yaml_char_t **prefix)
2255{
2256 yaml_char_t *handle_value = NULL;
2257 yaml_char_t *prefix_value = NULL;
2258
2259 /* Eat whitespaces. */
2260
625fcfe9 2261 if (!CACHE(parser, 1)) goto error;
e71095e3 2262
e35af832 2263 while (IS_BLANK(parser->buffer)) {
625fcfe9
KS		 2264 SKIP(parser);
2265 if (!CACHE(parser, 1)) goto error;
e71095e3
KS		 2266 }
2267
2268 /* Scan a handle. */
2269
2270 if (!yaml_parser_scan_tag_handle(parser, 1, start_mark, &handle_value))
2271 goto error;
2272
2273 /* Expect a whitespace. */
2274
625fcfe9 2275 if (!CACHE(parser, 1)) goto error;
e71095e3 2276
e35af832 2277 if (!IS_BLANK(parser->buffer)) {
e71095e3
KS		 2278 yaml_parser_set_scanner_error(parser, "while scanning a %TAG directive",
2279 start_mark, "did not find expected whitespace");
2280 goto error;
2281 }
2282
2283 /* Eat whitespaces. */
2284
e35af832 2285 while (IS_BLANK(parser->buffer)) {
625fcfe9
KS		 2286 SKIP(parser);
2287 if (!CACHE(parser, 1)) goto error;
e71095e3
KS		 2288 }
2289
2290 /* Scan a prefix. */
2291
2292 if (!yaml_parser_scan_tag_uri(parser, 1, NULL, start_mark, &prefix_value))
2293 goto error;
2294
2295 /* Expect a whitespace or line break. */
2296
625fcfe9 2297 if (!CACHE(parser, 1)) goto error;
e71095e3 2298
e35af832 2299 if (!IS_BLANKZ(parser->buffer)) {
e71095e3
KS		 2300 yaml_parser_set_scanner_error(parser, "while scanning a %TAG directive",
2301 start_mark, "did not find expected whitespace or line break");
2302 goto error;
2303 }
2304
2305 *handle = handle_value;
2306 *prefix = prefix_value;
2307
2308 return 1;
2309
2310error:
2311 yaml_free(handle_value);
2312 yaml_free(prefix_value);
2313 return 0;
2314}
2315
625fcfe9
KS		 2316static int
2317yaml_parser_scan_anchor(yaml_parser_t *parser, yaml_token_t *token,
e71095e3
KS		 2318 yaml_token_type_t type)
2319{
2320 int length = 0;
2321 yaml_mark_t start_mark, end_mark;
625fcfe9 2322 yaml_string_t string = NULL_STRING;
e71095e3 2323
625fcfe9 2324 if (!STRING_INIT(parser, string, INITIAL_STRING_SIZE)) goto error;
e71095e3
KS		 2325
2326 /* Eat the indicator character. */
2327
625fcfe9 2328 start_mark = parser->mark;
e71095e3 2329
625fcfe9 2330 SKIP(parser);
e71095e3
KS		 2331
2332 /* Consume the value. */
2333
625fcfe9 2334 if (!CACHE(parser, 1)) goto error;
e71095e3 2335
e35af832 2336 while (IS_ALPHA(parser->buffer)) {
625fcfe9
KS		 2337 if (!READ(parser, string)) goto error;
2338 if (!CACHE(parser, 1)) goto error;
e71095e3
KS		 2339 length ++;
2340 }
2341
625fcfe9 2342 end_mark = parser->mark;
e71095e3
KS		 2343
2344 /*
2345 * Check if length of the anchor is greater than 0 and it is followed by
2346 * a whitespace character or one of the indicators:
2347 *
2348 * '?', ':', ',', ']', '}', '%', '@', '`'.
2349 */
2350
e35af832
KS		 2351 if (!length || !(IS_BLANKZ(parser->buffer) || CHECK(parser->buffer, '?')
2352 || CHECK(parser->buffer, ':') || CHECK(parser->buffer, ',')
2353 || CHECK(parser->buffer, ']') || CHECK(parser->buffer, '}')
2354 || CHECK(parser->buffer, '%') || CHECK(parser->buffer, '@')
2355 || CHECK(parser->buffer, '`'))) {
e71095e3
KS		 2356 yaml_parser_set_scanner_error(parser, type == YAML_ANCHOR_TOKEN ?
2357 "while scanning an anchor" : "while scanning an alias", start_mark,
2358 "did not find expected alphabetic or numeric character");
2359 goto error;
2360 }
2361
2362 /* Create a token. */
2363
625fcfe9
KS		 2364 if (type == YAML_ANCHOR_TOKEN) {
2365 ANCHOR_TOKEN_INIT(*token, string.start, start_mark, end_mark);
2366 }
2367 else {
2368 ALIAS_TOKEN_INIT(*token, string.start, start_mark, end_mark);
92d41fe1 2369 }
e71095e3 2370
625fcfe9 2371 return 1;
e71095e3
KS		 2372
2373error:
625fcfe9 2374 STRING_DEL(parser, string);
e71095e3
KS		 2375 return 0;
2376}
2377
2378/*
2379 * Scan a TAG token.
2380 */
2381
625fcfe9
KS		 2382static int
2383yaml_parser_scan_tag(yaml_parser_t *parser, yaml_token_t *token)
e71095e3
KS		 2384{
2385 yaml_char_t *handle = NULL;
2386 yaml_char_t *suffix = NULL;
e71095e3
KS		 2387 yaml_mark_t start_mark, end_mark;
2388
625fcfe9 2389 start_mark = parser->mark;
e71095e3
KS		 2390
2391 /* Check if the tag is in the canonical form. */
2392
625fcfe9 2393 if (!CACHE(parser, 2)) goto error;
e71095e3 2394
e35af832 2395 if (CHECK_AT(parser->buffer, '<', 1))
e71095e3
KS		 2396 {
2397 /* Set the handle to '' */
2398
2399 handle = yaml_malloc(1);
2400 if (!handle) goto error;
2401 handle[0] = '\0';
2402
2403 /* Eat '!<' */
2404
625fcfe9
KS		 2405 SKIP(parser);
2406 SKIP(parser);
e71095e3
KS		 2407
2408 /* Consume the tag value. */
2409
2410 if (!yaml_parser_scan_tag_uri(parser, 0, NULL, start_mark, &suffix))
2411 goto error;
2412
2413 /* Check for '>' and eat it. */
2414
e35af832 2415 if (!CHECK(parser->buffer, '>')) {
e71095e3
KS		 2416 yaml_parser_set_scanner_error(parser, "while scanning a tag",
2417 start_mark, "did not find the expected '>'");
2418 goto error;
2419 }
2420
625fcfe9 2421 SKIP(parser);
e71095e3
KS		 2422 }
2423 else
2424 {
2425 /* The tag has either the '!suffix' or the '!handle!suffix' form. */
2426
2427 /* First, try to scan a handle. */
2428
2429 if (!yaml_parser_scan_tag_handle(parser, 0, start_mark, &handle))
2430 goto error;
2431
2432 /* Check if it is, indeed, handle. */
2433
2434 if (handle[0] == '!' && handle[1] != '\0' && handle[strlen((char *)handle)-1] == '!')
2435 {
2436 /* Scan the suffix now. */
2437
2438 if (!yaml_parser_scan_tag_uri(parser, 0, NULL, start_mark, &suffix))
2439 goto error;
2440 }
2441 else
2442 {
2443 /* It wasn't a handle after all. Scan the rest of the tag. */
2444
2445 if (!yaml_parser_scan_tag_uri(parser, 0, handle, start_mark, &suffix))
2446 goto error;
2447
2448 /* Set the handle to '!'. */
2449
2450 yaml_free(handle);
2451 handle = yaml_malloc(2);
2452 if (!handle) goto error;
2453 handle[0] = '!';
2454 handle[1] = '\0';
7e32c194
KS		 2455
2456 /*
625fcfe9
KS		 2457 * A special case: the '!' tag. Set the handle to '' and the
2458 * suffix to '!'.
7e32c194
KS		 2459 */
2460
2461 if (suffix[0] == '\0') {
2462 yaml_char_t *tmp = handle;
2463 handle = suffix;
2464 suffix = tmp;
2465 }
e71095e3
KS		 2466 }
2467 }
2468
2469 /* Check the character which ends the tag. */
2470
625fcfe9 2471 if (!CACHE(parser, 1)) goto error;
e71095e3 2472
e35af832 2473 if (!IS_BLANKZ(parser->buffer)) {
e71095e3 2474 yaml_parser_set_scanner_error(parser, "while scanning a tag",
6be8109b 2475 start_mark, "did not find expected whitespace or line break");
e71095e3
KS		 2476 goto error;
2477 }
2478
625fcfe9 2479 end_mark = parser->mark;
e71095e3
KS		 2480
2481 /* Create a token. */
2482
625fcfe9 2483 TAG_TOKEN_INIT(*token, handle, suffix, start_mark, end_mark);
e71095e3 2484
625fcfe9 2485 return 1;
e71095e3
KS		 2486
2487error:
2488 yaml_free(handle);
2489 yaml_free(suffix);
625fcfe9 2490 return 0;
e71095e3
KS		 2491}
2492
2493/*
2494 * Scan a tag handle.
2495 */
2496
2497static int
2498yaml_parser_scan_tag_handle(yaml_parser_t *parser, int directive,
2499 yaml_mark_t start_mark, yaml_char_t **handle)
2500{
625fcfe9 2501 yaml_string_t string = NULL_STRING;
e71095e3 2502
625fcfe9 2503 if (!STRING_INIT(parser, string, INITIAL_STRING_SIZE)) goto error;
e71095e3
KS		 2504
2505 /* Check the initial '!' character. */
2506
625fcfe9 2507 if (!CACHE(parser, 1)) goto error;
e71095e3 2508
e35af832 2509 if (!CHECK(parser->buffer, '!')) {
e71095e3
KS		 2510 yaml_parser_set_scanner_error(parser, directive ?
2511 "while scanning a tag directive" : "while scanning a tag",
2512 start_mark, "did not find expected '!'");
2513 goto error;
2514 }
2515
2516 /* Copy the '!' character. */
2517
625fcfe9 2518 if (!READ(parser, string)) goto error;
e71095e3
KS		 2519
2520 /* Copy all subsequent alphabetical and numerical characters. */
2521
625fcfe9 2522 if (!CACHE(parser, 1)) goto error;
e71095e3 2523
e35af832 2524 while (IS_ALPHA(parser->buffer))
e71095e3 2525 {
625fcfe9
KS		 2526 if (!READ(parser, string)) goto error;
2527 if (!CACHE(parser, 1)) goto error;
e71095e3
KS		 2528 }
2529
2530 /* Check if the trailing character is '!' and copy it. */
2531
e35af832 2532 if (CHECK(parser->buffer, '!'))
e71095e3 2533 {
625fcfe9 2534 if (!READ(parser, string)) goto error;
e71095e3
KS		 2535 }
2536 else
2537 {
2538 /*
7e32c194
KS		 2539 * It's either the '!' tag or not really a tag handle. If it's a %TAG
2540 * directive, it's an error. If it's a tag token, it must be a part of
2541 * URI.
e71095e3
KS		 2542 */
2543
625fcfe9 2544 if (directive && !(string.start[0] == '!' && string.start[1] == '\0')) {
7e32c194 2545 yaml_parser_set_scanner_error(parser, "while parsing a tag directive",
e71095e3
KS		 2546 start_mark, "did not find expected '!'");
2547 goto error;
2548 }
2549 }
2550
625fcfe9 2551 *handle = string.start;
e71095e3
KS		 2552
2553 return 1;
2554
2555error:
625fcfe9 2556 STRING_DEL(parser, string);
e71095e3
KS		 2557 return 0;
2558}
2559
2560/*
2561 * Scan a tag.
2562 */
2563
2564static int
2565yaml_parser_scan_tag_uri(yaml_parser_t *parser, int directive,
2566 yaml_char_t *head, yaml_mark_t start_mark, yaml_char_t **uri)
2567{
2568 size_t length = head ? strlen((char *)head) : 0;
625fcfe9 2569 yaml_string_t string = NULL_STRING;
e71095e3 2570
625fcfe9 2571 if (!STRING_INIT(parser, string, INITIAL_STRING_SIZE)) goto error;
e71095e3
KS		 2572
2573 /* Resize the string to include the head. */
2574
0174ed6e 2575 while (string.end - string.start <= (int)length) {
625fcfe9
KS		 2576 if (!yaml_string_extend(&string.start, &string.pointer, &string.end)) {
2577 parser->error = YAML_MEMORY_ERROR;
2578 goto error;
2579 }
e71095e3
KS		 2580 }
2581
7e32c194
KS		 2582 /*
2583 * Copy the head if needed.
2584 *
2585 * Note that we don't copy the leading '!' character.
2586 */
e71095e3 2587
7e32c194 2588 if (length > 1) {
625fcfe9 2589 memcpy(string.start, head+1, length-1);
7e32c194 2590 string.pointer += length-1;
e71095e3
KS		 2591 }
2592
2593 /* Scan the tag. */
2594
625fcfe9 2595 if (!CACHE(parser, 1)) goto error;
e71095e3
KS		 2596
2597 /*
2598 * The set of characters that may appear in URI is as follows:
2599 *
2600 * '0'-'9', 'A'-'Z', 'a'-'z', '_', '-', ';', '/', '?', ':', '@', '&',
2601 * '=', '+', '$', ',', '.', '!', '~', '*', '\'', '(', ')', '[', ']',
2602 * '%'.
2603 */
2604
e35af832
KS		 2605 while (IS_ALPHA(parser->buffer) || CHECK(parser->buffer, ';')
2606 || CHECK(parser->buffer, '/') || CHECK(parser->buffer, '?')
2607 || CHECK(parser->buffer, ':') || CHECK(parser->buffer, '@')
2608 || CHECK(parser->buffer, '&') || CHECK(parser->buffer, '=')
2609 || CHECK(parser->buffer, '+') || CHECK(parser->buffer, '$')
2610 || CHECK(parser->buffer, ',') || CHECK(parser->buffer, '.')
2611 || CHECK(parser->buffer, '!') || CHECK(parser->buffer, '~')
2612 || CHECK(parser->buffer, '*') || CHECK(parser->buffer, '\'')
2613 || CHECK(parser->buffer, '(') || CHECK(parser->buffer, ')')
2614 || CHECK(parser->buffer, '[') || CHECK(parser->buffer, ']')
2615 || CHECK(parser->buffer, '%'))
e71095e3 2616 {
e71095e3
KS		 2617 /* Check if it is a URI-escape sequence. */
2618
e35af832 2619 if (CHECK(parser->buffer, '%')) {
e71095e3
KS		 2620 if (!yaml_parser_scan_uri_escapes(parser,
2621 directive, start_mark, &string)) goto error;
2622 }
2623 else {
625fcfe9 2624 if (!READ(parser, string)) goto error;
e71095e3
KS		 2625 }
2626
2627 length ++;
625fcfe9 2628 if (!CACHE(parser, 1)) goto error;
e71095e3
KS		 2629 }
2630
2631 /* Check if the tag is non-empty. */
2632
2633 if (!length) {
625fcfe9
KS		 2634 if (!STRING_EXTEND(parser, string))
2635 goto error;
2636
e71095e3
KS		 2637 yaml_parser_set_scanner_error(parser, directive ?
2638 "while parsing a %TAG directive" : "while parsing a tag",
2639 start_mark, "did not find expected tag URI");
2640 goto error;
2641 }
2642
625fcfe9 2643 *uri = string.start;
e71095e3
KS		 2644
2645 return 1;
2646
2647error:
625fcfe9 2648 STRING_DEL(parser, string);
e71095e3
KS		 2649 return 0;
2650}
2651
2652/*
2653 * Decode an URI-escape sequence corresponding to a single UTF-8 character.
2654 */
2655
2656static int
2657yaml_parser_scan_uri_escapes(yaml_parser_t *parser, int directive,
2658 yaml_mark_t start_mark, yaml_string_t *string)
2659{
2660 int width = 0;
2661
2662 /* Decode the required number of characters. */
2663
2664 do {
2665
2666 unsigned char octet = 0;
2667
2668 /* Check for a URI-escaped octet. */
2669
625fcfe9 2670 if (!CACHE(parser, 3)) return 0;
e71095e3 2671
e35af832
KS		 2672 if (!(CHECK(parser->buffer, '%')
2673 && IS_HEX_AT(parser->buffer, 1)
2674 && IS_HEX_AT(parser->buffer, 2))) {
e71095e3
KS		 2675 return yaml_parser_set_scanner_error(parser, directive ?
2676 "while parsing a %TAG directive" : "while parsing a tag",
2677 start_mark, "did not find URI escaped octet");
2678 }
2679
2680 /* Get the octet. */
2681
e35af832 2682 octet = (AS_HEX_AT(parser->buffer, 1) << 4) + AS_HEX_AT(parser->buffer, 2);
e71095e3
KS		 2683
2684 /* If it is the leading octet, determine the length of the UTF-8 sequence. */
2685
2686 if (!width)
2687 {
2688 width = (octet & 0x80) == 0x00 ? 1 :
2689 (octet & 0xE0) == 0xC0 ? 2 :
2690 (octet & 0xF0) == 0xE0 ? 3 :
2691 (octet & 0xF8) == 0xF0 ? 4 : 0;
2692 if (!width) {
2693 return yaml_parser_set_scanner_error(parser, directive ?
2694 "while parsing a %TAG directive" : "while parsing a tag",
2695 start_mark, "found an incorrect leading UTF-8 octet");
2696 }
2697 }
2698 else
2699 {
2700 /* Check if the trailing octet is correct. */
2701
2702 if ((octet & 0xC0) != 0x80) {
2703 return yaml_parser_set_scanner_error(parser, directive ?
2704 "while parsing a %TAG directive" : "while parsing a tag",
2705 start_mark, "found an incorrect trailing UTF-8 octet");
2706 }
2707 }
2708
2709 /* Copy the octet and move the pointers. */
2710
2711 *(string->pointer++) = octet;
625fcfe9
KS		 2712 SKIP(parser);
2713 SKIP(parser);
2714 SKIP(parser);
e71095e3
KS		 2715
2716 } while (--width);
2717
2718 return 1;
2719}
2720
92d41fe1
KS		 2721/*
2722 * Scan a block scalar.
2723 */
2724
625fcfe9
KS		 2725static int
2726yaml_parser_scan_block_scalar(yaml_parser_t *parser, yaml_token_t *token,
2727 int literal)
92d41fe1
KS		 2728{
2729 yaml_mark_t start_mark;
2730 yaml_mark_t end_mark;
625fcfe9
KS		 2731 yaml_string_t string = NULL_STRING;
2732 yaml_string_t leading_break = NULL_STRING;
2733 yaml_string_t trailing_breaks = NULL_STRING;
92d41fe1
KS		 2734 int chomping = 0;
2735 int increment = 0;
2736 int indent = 0;
2737 int leading_blank = 0;
2738 int trailing_blank = 0;
2739
625fcfe9
KS		 2740 if (!STRING_INIT(parser, string, INITIAL_STRING_SIZE)) goto error;
2741 if (!STRING_INIT(parser, leading_break, INITIAL_STRING_SIZE)) goto error;
2742 if (!STRING_INIT(parser, trailing_breaks, INITIAL_STRING_SIZE)) goto error;
92d41fe1
KS		 2743
2744 /* Eat the indicator '|' or '>'. */
2745
625fcfe9 2746 start_mark = parser->mark;
92d41fe1 2747
625fcfe9 2748 SKIP(parser);
92d41fe1
KS		 2749
2750 /* Scan the additional block scalar indicators. */
2751
625fcfe9 2752 if (!CACHE(parser, 1)) goto error;
92d41fe1
KS		 2753
2754 /* Check for a chomping indicator. */
2755
e35af832 2756 if (CHECK(parser->buffer, '+') || CHECK(parser->buffer, '-'))
92d41fe1
KS		 2757 {
2758 /* Set the chomping method and eat the indicator. */
2759
e35af832 2760 chomping = CHECK(parser->buffer, '+') ? +1 : -1;
92d41fe1 2761
625fcfe9 2762 SKIP(parser);
92d41fe1
KS		 2763
2764 /* Check for an indentation indicator. */
2765
625fcfe9 2766 if (!CACHE(parser, 1)) goto error;
92d41fe1 2767
e35af832 2768 if (IS_DIGIT(parser->buffer))
92d41fe1
KS		 2769 {
2770 /* Check that the intendation is greater than 0. */
2771
e35af832 2772 if (CHECK(parser->buffer, '0')) {
92d41fe1
KS		 2773 yaml_parser_set_scanner_error(parser, "while scanning a block scalar",
2774 start_mark, "found an intendation indicator equal to 0");
2775 goto error;
2776 }
2777
2778 /* Get the intendation level and eat the indicator. */
2779
e35af832 2780 increment = AS_DIGIT(parser->buffer);
92d41fe1 2781
625fcfe9 2782 SKIP(parser);
92d41fe1
KS		 2783 }
2784 }
2785
2786 /* Do the same as above, but in the opposite order. */
2787
e35af832 2788 else if (IS_DIGIT(parser->buffer))
92d41fe1 2789 {
e35af832 2790 if (CHECK(parser->buffer, '0')) {
92d41fe1
KS		 2791 yaml_parser_set_scanner_error(parser, "while scanning a block scalar",
2792 start_mark, "found an intendation indicator equal to 0");
2793 goto error;
2794 }
2795
e35af832 2796 increment = AS_DIGIT(parser->buffer);
92d41fe1 2797
625fcfe9 2798 SKIP(parser);
92d41fe1 2799
625fcfe9 2800 if (!CACHE(parser, 1)) goto error;
92d41fe1 2801
e35af832
KS		 2802 if (CHECK(parser->buffer, '+') || CHECK(parser->buffer, '-')) {
2803 chomping = CHECK(parser->buffer, '+') ? +1 : -1;
625fcfe9
KS		 2804
2805 SKIP(parser);
92d41fe1
KS		 2806 }
2807 }
2808
2809 /* Eat whitespaces and comments to the end of the line. */
2810
625fcfe9 2811 if (!CACHE(parser, 1)) goto error;
92d41fe1 2812
e35af832 2813 while (IS_BLANK(parser->buffer)) {
625fcfe9
KS		 2814 SKIP(parser);
2815 if (!CACHE(parser, 1)) goto error;
92d41fe1
KS		 2816 }
2817
e35af832
KS		 2818 if (CHECK(parser->buffer, '#')) {
2819 while (!IS_BREAKZ(parser->buffer)) {
625fcfe9
KS		 2820 SKIP(parser);
2821 if (!CACHE(parser, 1)) goto error;
92d41fe1
KS		 2822 }
2823 }
2824
2825 /* Check if we are at the end of the line. */
2826
e35af832 2827 if (!IS_BREAKZ(parser->buffer)) {
92d41fe1 2828 yaml_parser_set_scanner_error(parser, "while scanning a block scalar",
6be8109b 2829 start_mark, "did not find expected comment or line break");
92d41fe1
KS		 2830 goto error;
2831 }
2832
2833 /* Eat a line break. */
2834
e35af832 2835 if (IS_BREAK(parser->buffer)) {
625fcfe9
KS		 2836 if (!CACHE(parser, 2)) goto error;
2837 SKIP_LINE(parser);
92d41fe1
KS		 2838 }
2839
625fcfe9 2840 end_mark = parser->mark;
92d41fe1
KS		 2841
2842 /* Set the intendation level if it was specified. */
2843
2844 if (increment) {
2845 indent = parser->indent >= 0 ? parser->indent+increment : increment;
2846 }
2847
2848 /* Scan the leading line breaks and determine the indentation level if needed. */
2849
21fbedd4 2850 if (!yaml_parser_scan_block_scalar_breaks(parser, &indent, &trailing_breaks,
92d41fe1
KS		 2851 start_mark, &end_mark)) goto error;
2852
2853 /* Scan the block scalar content. */
2854
625fcfe9 2855 if (!CACHE(parser, 1)) goto error;
92d41fe1 2856
0174ed6e 2857 while ((int)parser->mark.column == indent && !IS_Z(parser->buffer))
92d41fe1
KS		 2858 {
2859 /*
2860 * We are at the beginning of a non-empty line.
2861 */
2862
2863 /* Is it a trailing whitespace? */
2864
e35af832 2865 trailing_blank = IS_BLANK(parser->buffer);
92d41fe1
KS		 2866
2867 /* Check if we need to fold the leading line break. */
2868
625fcfe9 2869 if (!literal && (*leading_break.start == '\n')
92d41fe1
KS		 2870 && !leading_blank && !trailing_blank)
2871 {
2872 /* Do we need to join the lines by space? */
2873
625fcfe9
KS		 2874 if (*trailing_breaks.start == '\0') {
2875 if (!STRING_EXTEND(parser, string)) goto error;
92d41fe1
KS		 2876 *(string.pointer ++) = ' ';
2877 }
2878
625fcfe9 2879 CLEAR(parser, leading_break);
92d41fe1
KS		 2880 }
2881 else {
21fbedd4 2882 if (!JOIN(parser, string, leading_break)) goto error;
625fcfe9 2883 CLEAR(parser, leading_break);
92d41fe1
KS		 2884 }
2885
2886 /* Append the remaining line breaks. */
2887
21fbedd4 2888 if (!JOIN(parser, string, trailing_breaks)) goto error;
625fcfe9 2889 CLEAR(parser, trailing_breaks);
92d41fe1
KS		 2890
2891 /* Is it a leading whitespace? */
2892
e35af832 2893 leading_blank = IS_BLANK(parser->buffer);
92d41fe1
KS		 2894
2895 /* Consume the current line. */
2896
e35af832 2897 while (!IS_BREAKZ(parser->buffer)) {
625fcfe9
KS		 2898 if (!READ(parser, string)) goto error;
2899 if (!CACHE(parser, 1)) goto error;
92d41fe1
KS		 2900 }
2901
2902 /* Consume the line break. */
2903
625fcfe9 2904 if (!CACHE(parser, 2)) goto error;
92d41fe1 2905
625fcfe9 2906 if (!READ_LINE(parser, leading_break)) goto error;
92d41fe1
KS		 2907
2908 /* Eat the following intendation spaces and line breaks. */
2909
2910 if (!yaml_parser_scan_block_scalar_breaks(parser,
21fbedd4 2911 &indent, &trailing_breaks, start_mark, &end_mark)) goto error;
92d41fe1
KS		 2912 }
2913
2914 /* Chomp the tail. */
2915
2916 if (chomping != -1) {
21fbedd4 2917 if (!JOIN(parser, string, leading_break)) goto error;
92d41fe1
KS		 2918 }
2919 if (chomping == 1) {
21fbedd4 2920 if (!JOIN(parser, string, trailing_breaks)) goto error;
92d41fe1
KS		 2921 }
2922
2923 /* Create a token. */
2924
625fcfe9 2925 SCALAR_TOKEN_INIT(*token, string.start, string.pointer-string.start,
92d41fe1
KS		 2926 literal ? YAML_LITERAL_SCALAR_STYLE : YAML_FOLDED_SCALAR_STYLE,
2927 start_mark, end_mark);
92d41fe1 2928
625fcfe9
KS		 2929 STRING_DEL(parser, leading_break);
2930 STRING_DEL(parser, trailing_breaks);
92d41fe1 2931
625fcfe9 2932 return 1;
92d41fe1
KS		 2933
2934error:
625fcfe9
KS		 2935 STRING_DEL(parser, string);
2936 STRING_DEL(parser, leading_break);
2937 STRING_DEL(parser, trailing_breaks);
92d41fe1 2938
625fcfe9 2939 return 0;
92d41fe1
KS		 2940}
2941
2942/*
2943 * Scan intendation spaces and line breaks for a block scalar. Determine the
2944 * intendation level if needed.
2945 */
2946
2947static int
2948yaml_parser_scan_block_scalar_breaks(yaml_parser_t *parser,
2949 int *indent, yaml_string_t *breaks,
2950 yaml_mark_t start_mark, yaml_mark_t *end_mark)
2951{
2952 int max_indent = 0;
2953
625fcfe9 2954 *end_mark = parser->mark;
92d41fe1
KS		 2955
2956 /* Eat the intendation spaces and line breaks. */
2957
2958 while (1)
2959 {
2960 /* Eat the intendation spaces. */
2961
625fcfe9 2962 if (!CACHE(parser, 1)) return 0;
92d41fe1 2963
0174ed6e 2964 while ((!*indent || (int)parser->mark.column < *indent)
e35af832 2965 && IS_SPACE(parser->buffer)) {
625fcfe9
KS		 2966 SKIP(parser);
2967 if (!CACHE(parser, 1)) return 0;
92d41fe1
KS		 2968 }
2969
0174ed6e
KS		 2970 if ((int)parser->mark.column > max_indent)
2971 max_indent = (int)parser->mark.column;
92d41fe1
KS		 2972
2973 /* Check for a tab character messing the intendation. */
2974
0174ed6e 2975 if ((!*indent || (int)parser->mark.column < *indent)
e35af832 2976 && IS_TAB(parser->buffer)) {
92d41fe1
KS		 2977 return yaml_parser_set_scanner_error(parser, "while scanning a block scalar",
2978 start_mark, "found a tab character where an intendation space is expected");
2979 }
2980
2981 /* Have we found a non-empty line? */
2982
e35af832 2983 if (!IS_BREAK(parser->buffer)) break;
92d41fe1
KS		 2984
2985 /* Consume the line break. */
2986
625fcfe9
KS		 2987 if (!CACHE(parser, 2)) return 0;
2988 if (!READ_LINE(parser, *breaks)) return 0;
2989 *end_mark = parser->mark;
92d41fe1
KS		 2990 }
2991
2992 /* Determine the indentation level if needed. */
2993
2994 if (!*indent) {
2995 *indent = max_indent;
2996 if (*indent < parser->indent + 1)
2997 *indent = parser->indent + 1;
2998 if (*indent < 1)
2999 *indent = 1;
3000 }
3001
3002 return 1;
3003}
3004
21fbedd4
KS		 3005/*
3006 * Scan a quoted scalar.
3007 */
3008
625fcfe9
KS		 3009static int
3010yaml_parser_scan_flow_scalar(yaml_parser_t *parser, yaml_token_t *token,
3011 int single)
21fbedd4
KS		 3012{
3013 yaml_mark_t start_mark;
3014 yaml_mark_t end_mark;
625fcfe9
KS		 3015 yaml_string_t string = NULL_STRING;
3016 yaml_string_t leading_break = NULL_STRING;
3017 yaml_string_t trailing_breaks = NULL_STRING;
3018 yaml_string_t whitespaces = NULL_STRING;
21fbedd4
KS		 3019 int leading_blanks;
3020
625fcfe9
KS		 3021 if (!STRING_INIT(parser, string, INITIAL_STRING_SIZE)) goto error;
3022 if (!STRING_INIT(parser, leading_break, INITIAL_STRING_SIZE)) goto error;
3023 if (!STRING_INIT(parser, trailing_breaks, INITIAL_STRING_SIZE)) goto error;
3024 if (!STRING_INIT(parser, whitespaces, INITIAL_STRING_SIZE)) goto error;
21fbedd4
KS		 3025
3026 /* Eat the left quote. */
3027
625fcfe9 3028 start_mark = parser->mark;
21fbedd4 3029
625fcfe9 3030 SKIP(parser);
21fbedd4
KS		 3031
3032 /* Consume the content of the quoted scalar. */
3033
3034 while (1)
3035 {
3036 /* Check that there are no document indicators at the beginning of the line. */
3037
625fcfe9 3038 if (!CACHE(parser, 4)) goto error;
21fbedd4 3039
625fcfe9 3040 if (parser->mark.column == 0 &&
e35af832
KS		 3041 ((CHECK_AT(parser->buffer, '-', 0) &&
3042 CHECK_AT(parser->buffer, '-', 1) &&
3043 CHECK_AT(parser->buffer, '-', 2)) ||
3044 (CHECK_AT(parser->buffer, '.', 0) &&
3045 CHECK_AT(parser->buffer, '.', 1) &&
3046 CHECK_AT(parser->buffer, '.', 2))) &&
3047 IS_BLANKZ_AT(parser->buffer, 3))
21fbedd4
KS		 3048 {
3049 yaml_parser_set_scanner_error(parser, "while scanning a quoted scalar",
3050 start_mark, "found unexpected document indicator");
3051 goto error;
3052 }
3053
3054 /* Check for EOF. */
3055
e35af832 3056 if (IS_Z(parser->buffer)) {
21fbedd4
KS		 3057 yaml_parser_set_scanner_error(parser, "while scanning a quoted scalar",
3058 start_mark, "found unexpected end of stream");
3059 goto error;
3060 }
3061
3062 /* Consume non-blank characters. */
3063
625fcfe9 3064 if (!CACHE(parser, 2)) goto error;
21fbedd4
KS		 3065
3066 leading_blanks = 0;
3067
e35af832 3068 while (!IS_BLANKZ(parser->buffer))
21fbedd4
KS		 3069 {
3070 /* Check for an escaped single quote. */
3071
e35af832
KS		 3072 if (single && CHECK_AT(parser->buffer, '\'', 0)
3073 && CHECK_AT(parser->buffer, '\'', 1))
21fbedd4 3074 {
625fcfe9 3075 if (!STRING_EXTEND(parser, string)) goto error;
21fbedd4 3076 *(string.pointer++) = '\'';
625fcfe9
KS		 3077 SKIP(parser);
3078 SKIP(parser);
21fbedd4
KS		 3079 }
3080
3081 /* Check for the right quote. */
3082
e35af832 3083 else if (CHECK(parser->buffer, single ? '\'' : '"'))
21fbedd4
KS		 3084 {
3085 break;
3086 }
3087
3088 /* Check for an escaped line break. */
3089
e35af832
KS		 3090 else if (!single && CHECK(parser->buffer, '\\')
3091 && IS_BREAK_AT(parser->buffer, 1))
21fbedd4 3092 {
625fcfe9
KS		 3093 if (!CACHE(parser, 3)) goto error;
3094 SKIP(parser);
3095 SKIP_LINE(parser);
21fbedd4
KS		 3096 leading_blanks = 1;
3097 break;
3098 }
3099
3100 /* Check for an escape sequence. */
3101
e35af832 3102 else if (!single && CHECK(parser->buffer, '\\'))
21fbedd4 3103 {
0174ed6e 3104 size_t code_length = 0;
21fbedd4 3105
625fcfe9
KS		 3106 if (!STRING_EXTEND(parser, string)) goto error;
3107
21fbedd4
KS		 3108 /* Check the escape character. */
3109
625fcfe9 3110 switch (parser->buffer.pointer[1])
21fbedd4
KS		 3111 {
3112 case '0':
3113 *(string.pointer++) = '\0';
3114 break;
3115
3116 case 'a':
3117 *(string.pointer++) = '\x07';
3118 break;
3119
3120 case 'b':
3121 *(string.pointer++) = '\x08';
3122 break;
3123
3124 case 't':
3125 case '\t':
3126 *(string.pointer++) = '\x09';
3127 break;
3128
3129 case 'n':
3130 *(string.pointer++) = '\x0A';
3131 break;
3132
3133 case 'v':
3134 *(string.pointer++) = '\x0B';
3135 break;
3136
3137 case 'f':
3138 *(string.pointer++) = '\x0C';
3139 break;
3140
3141 case 'r':
3142 *(string.pointer++) = '\x0D';
3143 break;
3144
3145 case 'e':
3146 *(string.pointer++) = '\x1B';
3147 break;
3148
3149 case ' ':
3150 *(string.pointer++) = '\x20';
3151 break;
3152
3153 case '"':
3154 *(string.pointer++) = '"';
3155 break;
3156
3157 case '\'':
3158 *(string.pointer++) = '\'';
3159 break;
3160
7e32c194
KS		 3161 case '\\':
3162 *(string.pointer++) = '\\';
3163 break;
3164
21fbedd4
KS		 3165 case 'N': /* NEL (#x85) */
3166 *(string.pointer++) = '\xC2';
3167 *(string.pointer++) = '\x85';
3168 break;
3169
3170 case '_': /* #xA0 */
3171 *(string.pointer++) = '\xC2';
3172 *(string.pointer++) = '\xA0';
3173 break;
3174
3175 case 'L': /* LS (#x2028) */
3176 *(string.pointer++) = '\xE2';
3177 *(string.pointer++) = '\x80';
3178 *(string.pointer++) = '\xA8';
3179 break;
3180
3181 case 'P': /* PS (#x2029) */
3182 *(string.pointer++) = '\xE2';
3183 *(string.pointer++) = '\x80';
7e32c194 3184 *(string.pointer++) = '\xA9';
21fbedd4
KS		 3185 break;
3186
3187 case 'x':
3188 code_length = 2;
3189 break;
3190
3191 case 'u':
3192 code_length = 4;
3193 break;
3194
3195 case 'U':
3196 code_length = 8;
3197 break;
3198
3199 default:
3200 yaml_parser_set_scanner_error(parser, "while parsing a quoted scalar",
3201 start_mark, "found unknown escape character");
3202 goto error;
3203 }
3204
625fcfe9
KS		 3205 SKIP(parser);
3206 SKIP(parser);
21fbedd4
KS		 3207
3208 /* Consume an arbitrary escape code. */
3209
3210 if (code_length)
3211 {
3212 unsigned int value = 0;
0174ed6e 3213 size_t k;
21fbedd4
KS		 3214
3215 /* Scan the character value. */
3216
625fcfe9 3217 if (!CACHE(parser, code_length)) goto error;
21fbedd4
KS		 3218
3219 for (k = 0; k < code_length; k ++) {
e35af832 3220 if (!IS_HEX_AT(parser->buffer, k)) {
21fbedd4
KS		 3221 yaml_parser_set_scanner_error(parser, "while parsing a quoted scalar",
3222 start_mark, "did not find expected hexdecimal number");
3223 goto error;
3224 }
e35af832 3225 value = (value << 4) + AS_HEX_AT(parser->buffer, k);
21fbedd4
KS		 3226 }
3227
3228 /* Check the value and write the character. */
3229
3230 if ((value >= 0xD800 && value <= 0xDFFF) || value > 0x10FFFF) {
3231 yaml_parser_set_scanner_error(parser, "while parsing a quoted scalar",
3232 start_mark, "found invalid Unicode character escape code");
3233 goto error;
3234 }
3235
3236 if (value <= 0x7F) {
3237 *(string.pointer++) = value;
3238 }
3239 else if (value <= 0x7FF) {
3240 *(string.pointer++) = 0xC0 + (value >> 6);
3241 *(string.pointer++) = 0x80 + (value & 0x3F);
3242 }
3243 else if (value <= 0xFFFF) {
3244 *(string.pointer++) = 0xE0 + (value >> 12);
3245 *(string.pointer++) = 0x80 + ((value >> 6) & 0x3F);
3246 *(string.pointer++) = 0x80 + (value & 0x3F);
3247 }
3248 else {
3249 *(string.pointer++) = 0xF0 + (value >> 18);
3250 *(string.pointer++) = 0x80 + ((value >> 12) & 0x3F);
3251 *(string.pointer++) = 0x80 + ((value >> 6) & 0x3F);
3252 *(string.pointer++) = 0x80 + (value & 0x3F);
3253 }
3254
3255 /* Advance the pointer. */
3256
3257 for (k = 0; k < code_length; k ++) {
625fcfe9 3258 SKIP(parser);
21fbedd4
KS		 3259 }
3260 }
3261 }
3262
3263 else
3264 {
3265 /* It is a non-escaped non-blank character. */
3266
625fcfe9 3267 if (!READ(parser, string)) goto error;
21fbedd4
KS		 3268 }
3269
625fcfe9 3270 if (!CACHE(parser, 2)) goto error;
21fbedd4
KS		 3271 }
3272
3273 /* Check if we are at the end of the scalar. */
3274
e35af832 3275 if (CHECK(parser->buffer, single ? '\'' : '"'))
21fbedd4
KS		 3276 break;
3277
3278 /* Consume blank characters. */
3279
625fcfe9 3280 if (!CACHE(parser, 1)) goto error;
21fbedd4 3281
e35af832 3282 while (IS_BLANK(parser->buffer) || IS_BREAK(parser->buffer))
21fbedd4 3283 {
e35af832 3284 if (IS_BLANK(parser->buffer))
21fbedd4
KS		 3285 {
3286 /* Consume a space or a tab character. */
3287
3288 if (!leading_blanks) {
625fcfe9 3289 if (!READ(parser, whitespaces)) goto error;
21fbedd4 3290 }
7e32c194 3291 else {
625fcfe9 3292 SKIP(parser);
7e32c194 3293 }
21fbedd4
KS		 3294 }
3295 else
3296 {
625fcfe9 3297 if (!CACHE(parser, 2)) goto error;
21fbedd4
KS		 3298
3299 /* Check if it is a first line break. */
3300
3301 if (!leading_blanks)
3302 {
625fcfe9
KS		 3303 CLEAR(parser, whitespaces);
3304 if (!READ_LINE(parser, leading_break)) goto error;
21fbedd4
KS		 3305 leading_blanks = 1;
3306 }
3307 else
3308 {
625fcfe9 3309 if (!READ_LINE(parser, trailing_breaks)) goto error;
21fbedd4
KS		 3310 }
3311 }
625fcfe9 3312 if (!CACHE(parser, 1)) goto error;
21fbedd4
KS		 3313 }
3314
3315 /* Join the whitespaces or fold line breaks. */
3316
21fbedd4
KS		 3317 if (leading_blanks)
3318 {
3319 /* Do we need to fold line breaks? */
3320
625fcfe9
KS		 3321 if (leading_break.start[0] == '\n') {
3322 if (trailing_breaks.start[0] == '\0') {
3323 if (!STRING_EXTEND(parser, string)) goto error;
21fbedd4
KS		 3324 *(string.pointer++) = ' ';
3325 }
3326 else {
3327 if (!JOIN(parser, string, trailing_breaks)) goto error;
625fcfe9 3328 CLEAR(parser, trailing_breaks);
21fbedd4 3329 }
625fcfe9 3330 CLEAR(parser, leading_break);
21fbedd4
KS		 3331 }
3332 else {
3333 if (!JOIN(parser, string, leading_break)) goto error;
3334 if (!JOIN(parser, string, trailing_breaks)) goto error;
625fcfe9
KS		 3335 CLEAR(parser, leading_break);
3336 CLEAR(parser, trailing_breaks);
21fbedd4
KS		 3337 }
3338 }
3339 else
3340 {
3341 if (!JOIN(parser, string, whitespaces)) goto error;
625fcfe9 3342 CLEAR(parser, whitespaces);
21fbedd4
KS		 3343 }
3344 }
3345
3346 /* Eat the right quote. */
3347
625fcfe9 3348 SKIP(parser);
21fbedd4 3349
625fcfe9 3350 end_mark = parser->mark;
21fbedd4
KS		 3351
3352 /* Create a token. */
3353
625fcfe9 3354 SCALAR_TOKEN_INIT(*token, string.start, string.pointer-string.start,
21fbedd4
KS		 3355 single ? YAML_SINGLE_QUOTED_SCALAR_STYLE : YAML_DOUBLE_QUOTED_SCALAR_STYLE,
3356 start_mark, end_mark);
21fbedd4 3357
625fcfe9
KS		 3358 STRING_DEL(parser, leading_break);
3359 STRING_DEL(parser, trailing_breaks);
3360 STRING_DEL(parser, whitespaces);
21fbedd4 3361
625fcfe9 3362 return 1;
21fbedd4
KS		 3363
3364error:
625fcfe9
KS		 3365 STRING_DEL(parser, string);
3366 STRING_DEL(parser, leading_break);
3367 STRING_DEL(parser, trailing_breaks);
3368 STRING_DEL(parser, whitespaces);
21fbedd4 3369
625fcfe9 3370 return 0;
21fbedd4
KS		 3371}
3372
3373/*
3374 * Scan a plain scalar.
3375 */
3376
625fcfe9
KS		 3377static int
3378yaml_parser_scan_plain_scalar(yaml_parser_t *parser, yaml_token_t *token)
21fbedd4
KS		 3379{
3380 yaml_mark_t start_mark;
3381 yaml_mark_t end_mark;
625fcfe9
KS		 3382 yaml_string_t string = NULL_STRING;
3383 yaml_string_t leading_break = NULL_STRING;
3384 yaml_string_t trailing_breaks = NULL_STRING;
3385 yaml_string_t whitespaces = NULL_STRING;
21fbedd4
KS		 3386 int leading_blanks = 0;
3387 int indent = parser->indent+1;
3388
625fcfe9
KS		 3389 if (!STRING_INIT(parser, string, INITIAL_STRING_SIZE)) goto error;
3390 if (!STRING_INIT(parser, leading_break, INITIAL_STRING_SIZE)) goto error;
3391 if (!STRING_INIT(parser, trailing_breaks, INITIAL_STRING_SIZE)) goto error;
3392 if (!STRING_INIT(parser, whitespaces, INITIAL_STRING_SIZE)) goto error;
21fbedd4 3393
54815ffd 3394 start_mark = end_mark = parser->mark;
21fbedd4
KS		 3395
3396 /* Consume the content of the plain scalar. */
3397
3398 while (1)
3399 {
3400 /* Check for a document indicator. */
3401
625fcfe9 3402 if (!CACHE(parser, 4)) goto error;
21fbedd4 3403
625fcfe9 3404 if (parser->mark.column == 0 &&
e35af832
KS		 3405 ((CHECK_AT(parser->buffer, '-', 0) &&
3406 CHECK_AT(parser->buffer, '-', 1) &&
3407 CHECK_AT(parser->buffer, '-', 2)) ||
3408 (CHECK_AT(parser->buffer, '.', 0) &&
3409 CHECK_AT(parser->buffer, '.', 1) &&
3410 CHECK_AT(parser->buffer, '.', 2))) &&
3411 IS_BLANKZ_AT(parser->buffer, 3)) break;
21fbedd4
KS		 3412
3413 /* Check for a comment. */
3414
e35af832 3415 if (CHECK(parser->buffer, '#'))
21fbedd4
KS		 3416 break;
3417
3418 /* Consume non-blank characters. */
3419
e35af832 3420 while (!IS_BLANKZ(parser->buffer))
21fbedd4 3421 {
7e32c194 3422 /* Check for 'x:x' in the flow context. TODO: Fix the test "spec-08-13". */
21fbedd4 3423
e35af832
KS		 3424 if (parser->flow_level
3425 && CHECK(parser->buffer, ':')
3426 && !IS_BLANKZ_AT(parser->buffer, 1)) {
21fbedd4
KS		 3427 yaml_parser_set_scanner_error(parser, "while scanning a plain scalar",
3428 start_mark, "found unexpected ':'");
3429 goto error;
3430 }
3431
3432 /* Check for indicators that may end a plain scalar. */
3433
e35af832
KS		 3434 if ((CHECK(parser->buffer, ':') && IS_BLANKZ_AT(parser->buffer, 1))
3435 || (parser->flow_level &&
3436 (CHECK(parser->buffer, ',') || CHECK(parser->buffer, ':')
3437 || CHECK(parser->buffer, '?') || CHECK(parser->buffer, '[')
3438 || CHECK(parser->buffer, ']') || CHECK(parser->buffer, '{')
3439 || CHECK(parser->buffer, '}'))))
21fbedd4
KS		 3440 break;
3441
3442 /* Check if we need to join whitespaces and breaks. */
3443
625fcfe9 3444 if (leading_blanks || whitespaces.start != whitespaces.pointer)
21fbedd4 3445 {
21fbedd4
KS		 3446 if (leading_blanks)
3447 {
3448 /* Do we need to fold line breaks? */
3449
625fcfe9
KS		 3450 if (leading_break.start[0] == '\n') {
3451 if (trailing_breaks.start[0] == '\0') {
3452 if (!STRING_EXTEND(parser, string)) goto error;
21fbedd4
KS		 3453 *(string.pointer++) = ' ';
3454 }
3455 else {
3456 if (!JOIN(parser, string, trailing_breaks)) goto error;
625fcfe9 3457 CLEAR(parser, trailing_breaks);
21fbedd4 3458 }
625fcfe9 3459 CLEAR(parser, leading_break);
21fbedd4
KS		 3460 }
3461 else {
3462 if (!JOIN(parser, string, leading_break)) goto error;
3463 if (!JOIN(parser, string, trailing_breaks)) goto error;
625fcfe9
KS		 3464 CLEAR(parser, leading_break);
3465 CLEAR(parser, trailing_breaks);
21fbedd4
KS		 3466 }
3467
3468 leading_blanks = 0;
3469 }
3470 else
3471 {
3472 if (!JOIN(parser, string, whitespaces)) goto error;
625fcfe9 3473 CLEAR(parser, whitespaces);
21fbedd4
KS		 3474 }
3475 }
3476
3477 /* Copy the character. */
3478
625fcfe9 3479 if (!READ(parser, string)) goto error;
21fbedd4 3480
625fcfe9 3481 end_mark = parser->mark;
21fbedd4 3482
625fcfe9 3483 if (!CACHE(parser, 2)) goto error;
21fbedd4
KS		 3484 }
3485
3486 /* Is it the end? */
3487
e35af832 3488 if (!(IS_BLANK(parser->buffer) || IS_BREAK(parser->buffer)))
21fbedd4
KS		 3489 break;
3490
3491 /* Consume blank characters. */
3492
625fcfe9 3493 if (!CACHE(parser, 1)) goto error;
21fbedd4 3494
e35af832 3495 while (IS_BLANK(parser->buffer) || IS_BREAK(parser->buffer))
21fbedd4 3496 {
e35af832 3497 if (IS_BLANK(parser->buffer))
21fbedd4
KS		 3498 {
3499 /* Check for tab character that abuse intendation. */
3500
0174ed6e 3501 if (leading_blanks && (int)parser->mark.column < indent
e35af832 3502 && IS_TAB(parser->buffer)) {
21fbedd4
KS		 3503 yaml_parser_set_scanner_error(parser, "while scanning a plain scalar",
3504 start_mark, "found a tab character that violate intendation");
7e32c194 3505 goto error;
21fbedd4
KS		 3506 }
3507
3508 /* Consume a space or a tab character. */
3509
3510 if (!leading_blanks) {
625fcfe9 3511 if (!READ(parser, whitespaces)) goto error;
21fbedd4 3512 }
7e32c194 3513 else {
625fcfe9 3514 SKIP(parser);
7e32c194 3515 }
21fbedd4
KS		 3516 }
3517 else
3518 {
625fcfe9 3519 if (!CACHE(parser, 2)) goto error;
21fbedd4
KS		 3520
3521 /* Check if it is a first line break. */
3522
3523 if (!leading_blanks)
3524 {
625fcfe9
KS		 3525 CLEAR(parser, whitespaces);
3526 if (!READ_LINE(parser, leading_break)) goto error;
21fbedd4
KS		 3527 leading_blanks = 1;
3528 }
3529 else
3530 {
625fcfe9 3531 if (!READ_LINE(parser, trailing_breaks)) goto error;
21fbedd4
KS		 3532 }
3533 }
625fcfe9 3534 if (!CACHE(parser, 1)) goto error;
21fbedd4
KS		 3535 }
3536
3537 /* Check intendation level. */
3538
0174ed6e 3539 if (!parser->flow_level && (int)parser->mark.column < indent)
21fbedd4
KS		 3540 break;
3541 }
3542
3543 /* Create a token. */
3544
625fcfe9 3545 SCALAR_TOKEN_INIT(*token, string.start, string.pointer-string.start,
21fbedd4 3546 YAML_PLAIN_SCALAR_STYLE, start_mark, end_mark);
21fbedd4
KS		 3547
3548 /* Note that we change the 'simple_key_allowed' flag. */
3549
3550 if (leading_blanks) {
3551 parser->simple_key_allowed = 1;
3552 }
3553
625fcfe9
KS		 3554 STRING_DEL(parser, leading_break);
3555 STRING_DEL(parser, trailing_breaks);
3556 STRING_DEL(parser, whitespaces);
21fbedd4 3557
625fcfe9 3558 return 1;
21fbedd4
KS		 3559
3560error:
625fcfe9
KS		 3561 STRING_DEL(parser, string);
3562 STRING_DEL(parser, leading_break);
3563 STRING_DEL(parser, trailing_breaks);
3564 STRING_DEL(parser, whitespaces);
21fbedd4 3565
625fcfe9 3566 return 0;
21fbedd4
KS		 3567}
3568
Fast YAML 1.1 parser and emitter library
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