Ruby 2.1.5p273(2014-11-13revision48405)

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scanner.c
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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
478 #include "yaml_private.h"
479
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
485 #define CACHE(parser,length) \
486 (parser->unread >= (length) \
487 ? 1 \
488 : yaml_parser_update_buffer(parser, (length)))
489
490 /*
491 * Advance the buffer pointer.
492 */
493
494 #define SKIP(parser) \
495 (parser->mark.index ++, \
496 parser->mark.column ++, \
497 parser->unread --, \
498 parser->buffer.pointer += WIDTH(parser->buffer))
499
500 #define SKIP_LINE(parser) \
501 (IS_CRLF(parser->buffer) ? \
502 (parser->mark.index += 2, \
503 parser->mark.column = 0, \
504 parser->mark.line ++, \
505 parser->unread -= 2, \
506 parser->buffer.pointer += 2) : \
507 IS_BREAK(parser->buffer) ? \
508 (parser->mark.index ++, \
509 parser->mark.column = 0, \
510 parser->mark.line ++, \
511 parser->unread --, \
512 parser->buffer.pointer += WIDTH(parser->buffer)) : 0)
513
514 /*
515 * Copy a character to a string buffer and advance pointers.
516 */
517
518 #define READ(parser,string) \
519 (STRING_EXTEND(parser,string) ? \
520 (COPY(string,parser->buffer), \
521 parser->mark.index ++, \
522 parser->mark.column ++, \
523 parser->unread --, \
524 1) : 0)
525
526 /*
527 * Copy a line break character to a string buffer and advance pointers.
528 */
529
530 #define READ_LINE(parser,string) \
531 (STRING_EXTEND(parser,string) ? \
532 (((CHECK_AT(parser->buffer,'\r',0) \
533 && CHECK_AT(parser->buffer,'\n',1)) ? /* CR LF -> LF */ \
534 (*((string).pointer++) = (yaml_char_t) '\n', \
535 parser->buffer.pointer += 2, \
536 parser->mark.index += 2, \
537 parser->mark.column = 0, \
538 parser->mark.line ++, \
539 parser->unread -= 2) : \
540 (CHECK_AT(parser->buffer,'\r',0) \
541 || CHECK_AT(parser->buffer,'\n',0)) ? /* CR|LF -> LF */ \
542 (*((string).pointer++) = (yaml_char_t) '\n', \
543 parser->buffer.pointer ++, \
544 parser->mark.index ++, \
545 parser->mark.column = 0, \
546 parser->mark.line ++, \
547 parser->unread --) : \
548 (CHECK_AT(parser->buffer,'\xC2',0) \
549 && CHECK_AT(parser->buffer,'\x85',1)) ? /* NEL -> LF */ \
550 (*((string).pointer++) = (yaml_char_t) '\n', \
551 parser->buffer.pointer += 2, \
552 parser->mark.index ++, \
553 parser->mark.column = 0, \
554 parser->mark.line ++, \
555 parser->unread --) : \
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 */ \
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)
568
569 /*
570 * Public API declarations.
571 */
572
573 YAML_DECLARE(int)
574 yaml_parser_scan(yaml_parser_t *parser, yaml_token_t *token);
575
576 /*
577 * Error handling.
578 */
579
580 static int
581 yaml_parser_set_scanner_error(yaml_parser_t *parser, const char *context,
582 yaml_mark_t context_mark, const char *problem);
583
584 /*
585 * High-level token API.
586 */
587
588 YAML_DECLARE(int)
589 yaml_parser_fetch_more_tokens(yaml_parser_t *parser);
590
591 static int
592 yaml_parser_fetch_next_token(yaml_parser_t *parser);
593
594 /*
595 * Potential simple keys.
596 */
597
598 static int
599 yaml_parser_stale_simple_keys(yaml_parser_t *parser);
600
601 static int
602 yaml_parser_save_simple_key(yaml_parser_t *parser);
603
604 static int
605 yaml_parser_remove_simple_key(yaml_parser_t *parser);
606
607 static int
608 yaml_parser_increase_flow_level(yaml_parser_t *parser);
609
610 static int
611 yaml_parser_decrease_flow_level(yaml_parser_t *parser);
612
613 /*
614 * Indentation treatment.
615 */
616
617 static int
618 yaml_parser_roll_indent(yaml_parser_t *parser, ptrdiff_t column,
619 ptrdiff_t number, yaml_token_type_t type, yaml_mark_t mark);
620
621 static int
622 yaml_parser_unroll_indent(yaml_parser_t *parser, ptrdiff_t column);
623
624 /*
625 * Token fetchers.
626 */
627
628 static int
629 yaml_parser_fetch_stream_start(yaml_parser_t *parser);
630
631 static int
632 yaml_parser_fetch_stream_end(yaml_parser_t *parser);
633
634 static int
635 yaml_parser_fetch_directive(yaml_parser_t *parser);
636
637 static int
638 yaml_parser_fetch_document_indicator(yaml_parser_t *parser,
639 yaml_token_type_t type);
640
641 static int
642 yaml_parser_fetch_flow_collection_start(yaml_parser_t *parser,
643 yaml_token_type_t type);
644
645 static int
646 yaml_parser_fetch_flow_collection_end(yaml_parser_t *parser,
647 yaml_token_type_t type);
648
649 static int
650 yaml_parser_fetch_flow_entry(yaml_parser_t *parser);
651
652 static int
653 yaml_parser_fetch_block_entry(yaml_parser_t *parser);
654
655 static int
656 yaml_parser_fetch_key(yaml_parser_t *parser);
657
658 static int
659 yaml_parser_fetch_value(yaml_parser_t *parser);
660
661 static int
662 yaml_parser_fetch_anchor(yaml_parser_t *parser, yaml_token_type_t type);
663
664 static int
665 yaml_parser_fetch_tag(yaml_parser_t *parser);
666
667 static int
668 yaml_parser_fetch_block_scalar(yaml_parser_t *parser, int literal);
669
670 static int
671 yaml_parser_fetch_flow_scalar(yaml_parser_t *parser, int single);
672
673 static int
674 yaml_parser_fetch_plain_scalar(yaml_parser_t *parser);
675
676 /*
677 * Token scanners.
678 */
679
680 static int
681 yaml_parser_scan_to_next_token(yaml_parser_t *parser);
682
683 static int
684 yaml_parser_scan_directive(yaml_parser_t *parser, yaml_token_t *token);
685
686 static int
687 yaml_parser_scan_directive_name(yaml_parser_t *parser,
688 yaml_mark_t start_mark, yaml_char_t **name);
689
690 static int
691 yaml_parser_scan_version_directive_value(yaml_parser_t *parser,
692 yaml_mark_t start_mark, int *major, int *minor);
693
694 static int
695 yaml_parser_scan_version_directive_number(yaml_parser_t *parser,
696 yaml_mark_t start_mark, int *number);
697
698 static int
699 yaml_parser_scan_tag_directive_value(yaml_parser_t *parser,
700 yaml_mark_t mark, yaml_char_t **handle, yaml_char_t **prefix);
701
702 static int
703 yaml_parser_scan_anchor(yaml_parser_t *parser, yaml_token_t *token,
704 yaml_token_type_t type);
705
706 static int
707 yaml_parser_scan_tag(yaml_parser_t *parser, yaml_token_t *token);
708
709 static int
710 yaml_parser_scan_tag_handle(yaml_parser_t *parser, int directive,
711 yaml_mark_t start_mark, yaml_char_t **handle);
712
713 static int
714 yaml_parser_scan_tag_uri(yaml_parser_t *parser, int directive,
715 yaml_char_t *head, yaml_mark_t start_mark, yaml_char_t **uri);
716
717 static int
718 yaml_parser_scan_uri_escapes(yaml_parser_t *parser, int directive,
719 yaml_mark_t start_mark, yaml_string_t *string);
720
721 static int
722 yaml_parser_scan_block_scalar(yaml_parser_t *parser, yaml_token_t *token,
723 int literal);
724
725 static int
726 yaml_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
730 static int
731 yaml_parser_scan_flow_scalar(yaml_parser_t *parser, yaml_token_t *token,
732 int single);
733
734 static int
735 yaml_parser_scan_plain_scalar(yaml_parser_t *parser, yaml_token_t *token);
736
737 /*
738 * Get the next token.
739 */
740
741 YAML_DECLARE(int)
742 yaml_parser_scan(yaml_parser_t *parser, yaml_token_t *token)
743 {
744 assert(parser); /* Non-NULL parser object is expected. */
745 assert(token); /* Non-NULL token object is expected. */
746
747 /* Erase the token object. */
748
749 memset(token, 0, sizeof(yaml_token_t));
750
751 /* No tokens after STREAM-END or error. */
752
753 if (parser->stream_end_produced || parser->error) {
754 return 1;
755 }
756
757 /* Ensure that the tokens queue contains enough tokens. */
758
759 if (!parser->token_available) {
760 if (!yaml_parser_fetch_more_tokens(parser))
761 return 0;
762 }
763
764 /* Fetch the next token from the queue. */
765
766 *token = DEQUEUE(parser, parser->tokens);
767 parser->token_available = 0;
768 parser->tokens_parsed ++;
769
770 if (token->type == YAML_STREAM_END_TOKEN) {
771 parser->stream_end_produced = 1;
772 }
773
774 return 1;
775 }
776
777 /*
778 * Set the scanner error and return 0.
779 */
780
781 static int
782 yaml_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;
789 parser->problem_mark = parser->mark;
790
791 return 0;
792 }
793
794 /*
795 * Ensure that the tokens queue contains at least one token which can be
796 * returned to the Parser.
797 */
798
799 YAML_DECLARE(int)
800 yaml_parser_fetch_more_tokens(yaml_parser_t *parser)
801 {
802 int need_more_tokens;
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
814 if (parser->tokens.head == parser->tokens.tail)
815 {
816 /* Queue is empty. */
817
818 need_more_tokens = 1;
819 }
820 else
821 {
822 yaml_simple_key_t *simple_key;
823
824 /* Check if any potential simple key may occupy the head position. */
825
826 if (!yaml_parser_stale_simple_keys(parser))
827 return 0;
828
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) {
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
850 parser->token_available = 1;
851
852 return 1;
853 }
854
855 /*
856 * The dispatcher for token fetchers.
857 */
858
859 static int
860 yaml_parser_fetch_next_token(yaml_parser_t *parser)
861 {
862 /* Ensure that the buffer is initialized. */
863
864 if (!CACHE(parser, 1))
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
877 /* Remove obsolete potential simple keys. */
878
879 if (!yaml_parser_stale_simple_keys(parser))
880 return 0;
881
882 /* Check the indentation level against the current column. */
883
884 if (!yaml_parser_unroll_indent(parser, parser->mark.column))
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
892 if (!CACHE(parser, 4))
893 return 0;
894
895 /* Is it the end of the stream? */
896
897 if (IS_Z(parser->buffer))
898 return yaml_parser_fetch_stream_end(parser);
899
900 /* Is it a directive? */
901
902 if (parser->mark.column == 0 && CHECK(parser->buffer, '%'))
903 return yaml_parser_fetch_directive(parser);
904
905 /* Is it the document start indicator? */
906
907 if (parser->mark.column == 0
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))
912 return yaml_parser_fetch_document_indicator(parser,
913 YAML_DOCUMENT_START_TOKEN);
914
915 /* Is it the document end indicator? */
916
917 if (parser->mark.column == 0
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))
922 return yaml_parser_fetch_document_indicator(parser,
923 YAML_DOCUMENT_END_TOKEN);
924
925 /* Is it the flow sequence start indicator? */
926
927 if (CHECK(parser->buffer, '['))
928 return yaml_parser_fetch_flow_collection_start(parser,
929 YAML_FLOW_SEQUENCE_START_TOKEN);
930
931 /* Is it the flow mapping start indicator? */
932
933 if (CHECK(parser->buffer, '{'))
934 return yaml_parser_fetch_flow_collection_start(parser,
935 YAML_FLOW_MAPPING_START_TOKEN);
936
937 /* Is it the flow sequence end indicator? */
938
939 if (CHECK(parser->buffer, ']'))
940 return yaml_parser_fetch_flow_collection_end(parser,
941 YAML_FLOW_SEQUENCE_END_TOKEN);
942
943 /* Is it the flow mapping end indicator? */
944
945 if (CHECK(parser->buffer, '}'))
946 return yaml_parser_fetch_flow_collection_end(parser,
947 YAML_FLOW_MAPPING_END_TOKEN);
948
949 /* Is it the flow entry indicator? */
950
951 if (CHECK(parser->buffer, ','))
952 return yaml_parser_fetch_flow_entry(parser);
953
954 /* Is it the block entry indicator? */
955
956 if (CHECK(parser->buffer, '-') && IS_BLANKZ_AT(parser->buffer, 1))
957 return yaml_parser_fetch_block_entry(parser);
958
959 /* Is it the key indicator? */
960
961 if (CHECK(parser->buffer, '?')
962 && (parser->flow_level || IS_BLANKZ_AT(parser->buffer, 1)))
963 return yaml_parser_fetch_key(parser);
964
965 /* Is it the value indicator? */
966
967 if (CHECK(parser->buffer, ':')
968 && (parser->flow_level || IS_BLANKZ_AT(parser->buffer, 1)))
969 return yaml_parser_fetch_value(parser);
970
971 /* Is it an alias? */
972
973 if (CHECK(parser->buffer, '*'))
974 return yaml_parser_fetch_anchor(parser, YAML_ALIAS_TOKEN);
975
976 /* Is it an anchor? */
977
978 if (CHECK(parser->buffer, '&'))
979 return yaml_parser_fetch_anchor(parser, YAML_ANCHOR_TOKEN);
980
981 /* Is it a tag? */
982
983 if (CHECK(parser->buffer, '!'))
984 return yaml_parser_fetch_tag(parser);
985
986 /* Is it a literal scalar? */
987
988 if (CHECK(parser->buffer, '|') && !parser->flow_level)
989 return yaml_parser_fetch_block_scalar(parser, 1);
990
991 /* Is it a folded scalar? */
992
993 if (CHECK(parser->buffer, '>') && !parser->flow_level)
994 return yaml_parser_fetch_block_scalar(parser, 0);
995
996 /* Is it a single-quoted scalar? */
997
998 if (CHECK(parser->buffer, '\''))
999 return yaml_parser_fetch_flow_scalar(parser, 1);
1000
1001 /* Is it a double-quoted scalar? */
1002
1003 if (CHECK(parser->buffer, '"'))
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 *
1015 * In the block context (and, for the '-' indicator, in the flow context
1016 * too), it may also start with the characters
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
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)) ||
1036 (!parser->flow_level &&
1037 (CHECK(parser->buffer, '?') || CHECK(parser->buffer, ':'))
1038 && !IS_BLANKZ_AT(parser->buffer, 1)))
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
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");
1048 }
1049
1050 /*
1051 * Check the list of potential simple keys and remove the positions that
1052 * cannot contain simple keys anymore.
1053 */
1054
1055 static int
1056 yaml_parser_stale_simple_keys(yaml_parser_t *parser)
1057 {
1058 yaml_simple_key_t *simple_key;
1059
1060 /* Check for a potential simple key for each flow level. */
1061
1062 for (simple_key = parser->simple_keys.start;
1063 simple_key != parser->simple_keys.top; simple_key ++)
1064 {
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
1072 if (simple_key->possible
1073 && (simple_key->mark.line < parser->mark.line
1074 || simple_key->mark.index+1024 < parser->mark.index)) {
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,
1081 "could not find expected ':'");
1082 }
1083
1084 simple_key->possible = 0;
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
1096 static int
1097 yaml_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
1105 int required = (!parser->flow_level
1106 && parser->indent == (ptrdiff_t)parser->mark.column);
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 {
1121 yaml_simple_key_t simple_key;
1122 simple_key.possible = 1;
1123 simple_key.required = required;
1124 simple_key.token_number =
1125 parser->tokens_parsed + (parser->tokens.tail - parser->tokens.head);
1126 simple_key.mark = parser->mark;
1127
1128 if (!yaml_parser_remove_simple_key(parser)) return 0;
1129
1130 *(parser->simple_keys.top-1) = simple_key;
1131 }
1132
1133 return 1;
1134 }
1135
1136 /*
1137 * Remove a potential simple key at the current flow level.
1138 */
1139
1140 static int
1141 yaml_parser_remove_simple_key(yaml_parser_t *parser)
1142 {
1143 yaml_simple_key_t *simple_key = parser->simple_keys.top-1;
1144
1145 if (simple_key->possible)
1146 {
1147 /* If the key is required, it is an error. */
1148
1149 if (simple_key->required) {
1150 return yaml_parser_set_scanner_error(parser,
1151 "while scanning a simple key", simple_key->mark,
1152 "could not find expected ':'");
1153 }
1154 }
1155
1156 /* Remove the key from the stack. */
1157
1158 simple_key->possible = 0;
1159
1160 return 1;
1161 }
1162
1163 /*
1164 * Increase the flow level and resize the simple key list if needed.
1165 */
1166
1167 static int
1168 yaml_parser_increase_flow_level(yaml_parser_t *parser)
1169 {
1170 yaml_simple_key_t empty_simple_key = { 0, 0, 0, { 0, 0, 0 } };
1171
1172 /* Reset the simple key on the next level. */
1173
1174 if (!PUSH(parser, parser->simple_keys, empty_simple_key))
1175 return 0;
1176
1177 /* Increase the flow level. */
1178
1179 if (parser->flow_level == INT_MAX) {
1180 parser->error = YAML_MEMORY_ERROR;
1181 return 0;
1182 }
1183
1184 parser->flow_level++;
1185
1186 return 1;
1187 }
1188
1189 /*
1190 * Decrease the flow level.
1191 */
1192
1193 static int
1194 yaml_parser_decrease_flow_level(yaml_parser_t *parser)
1195 {
1196 if (parser->flow_level) {
1197 parser->flow_level --;
1198 (void)POP(parser, parser->simple_keys);
1199 }
1200
1201 return 1;
1202 }
1203
1204 /*
1205 * Push the current indentation level to the stack and set the new level
1206 * the current column is greater than the indentation level. In this case,
1207 * append or insert the specified token into the token queue.
1208 *
1209 */
1210
1211 static int
1212 yaml_parser_roll_indent(yaml_parser_t *parser, ptrdiff_t column,
1213 ptrdiff_t number, yaml_token_type_t type, yaml_mark_t mark)
1214 {
1215 yaml_token_t token;
1216
1217 /* In the flow context, do nothing. */
1218
1219 if (parser->flow_level)
1220 return 1;
1221
1222 if (parser->indent < column)
1223 {
1224 /*
1225 * Push the current indentation level to the stack and set the new
1226 * indentation level.
1227 */
1228
1229 if (!PUSH(parser, parser->indents, parser->indent))
1230 return 0;
1231
1232 #if PTRDIFF_MAX > INT_MAX
1233 if (column > INT_MAX) {
1234 parser->error = YAML_MEMORY_ERROR;
1235 return 0;
1236 }
1237 #endif
1238
1239 parser->indent = (int)column;
1240
1241 /* Create a token and insert it into the queue. */
1242
1243 TOKEN_INIT(token, type, mark, mark);
1244
1245 if (number == -1) {
1246 if (!ENQUEUE(parser, parser->tokens, token))
1247 return 0;
1248 }
1249 else {
1250 if (!QUEUE_INSERT(parser,
1251 parser->tokens, number - parser->tokens_parsed, token))
1252 return 0;
1253 }
1254 }
1255
1256 return 1;
1257 }
1258
1259 /*
1260 * Pop indentation levels from the indents stack until the current level
1261 * becomes less or equal to the column. For each intendation level, append
1262 * the BLOCK-END token.
1263 */
1264
1265
1266 static int
1267 yaml_parser_unroll_indent(yaml_parser_t *parser, ptrdiff_t column)
1268 {
1269 yaml_token_t token;
1270
1271 /* In the flow context, do nothing. */
1272
1273 if (parser->flow_level)
1274 return 1;
1275
1276 /* Loop through the intendation levels in the stack. */
1277
1278 while (parser->indent > column)
1279 {
1280 /* Create a token and append it to the queue. */
1281
1282 TOKEN_INIT(token, YAML_BLOCK_END_TOKEN, parser->mark, parser->mark);
1283
1284 if (!ENQUEUE(parser, parser->tokens, token))
1285 return 0;
1286
1287 /* Pop the indentation level. */
1288
1289 parser->indent = POP(parser, parser->indents);
1290 }
1291
1292 return 1;
1293 }
1294
1295 /*
1296 * Initialize the scanner and produce the STREAM-START token.
1297 */
1298
1299 static int
1300 yaml_parser_fetch_stream_start(yaml_parser_t *parser)
1301 {
1302 yaml_simple_key_t simple_key = { 0, 0, 0, { 0, 0, 0 } };
1303 yaml_token_t token;
1304
1305 /* Set the initial indentation. */
1306
1307 parser->indent = -1;
1308
1309 /* Initialize the simple key stack. */
1310
1311 if (!PUSH(parser, parser->simple_keys, simple_key))
1312 return 0;
1313
1314 /* A simple key is allowed at the beginning of the stream. */
1315
1316 parser->simple_key_allowed = 1;
1317
1318 /* We have started. */
1319
1320 parser->stream_start_produced = 1;
1321
1322 /* Create the STREAM-START token and append it to the queue. */
1323
1324 STREAM_START_TOKEN_INIT(token, parser->encoding,
1325 parser->mark, parser->mark);
1326
1327 if (!ENQUEUE(parser, parser->tokens, token))
1328 return 0;
1329
1330 return 1;
1331 }
1332
1333 /*
1334 * Produce the STREAM-END token and shut down the scanner.
1335 */
1336
1337 static int
1338 yaml_parser_fetch_stream_end(yaml_parser_t *parser)
1339 {
1340 yaml_token_t token;
1341
1342 /* Force new line. */
1343
1344 if (parser->mark.column != 0) {
1345 parser->mark.column = 0;
1346 parser->mark.line ++;
1347 }
1348
1349 /* Reset the indentation level. */
1350
1351 if (!yaml_parser_unroll_indent(parser, -1))
1352 return 0;
1353
1354 /* Reset simple keys. */
1355
1356 if (!yaml_parser_remove_simple_key(parser))
1357 return 0;
1358
1359 parser->simple_key_allowed = 0;
1360
1361 /* Create the STREAM-END token and append it to the queue. */
1362
1363 STREAM_END_TOKEN_INIT(token, parser->mark, parser->mark);
1364
1365 if (!ENQUEUE(parser, parser->tokens, token))
1366 return 0;
1367
1368 return 1;
1369 }
1370
1371 /*
1372 * Produce a VERSION-DIRECTIVE or TAG-DIRECTIVE token.
1373 */
1374
1375 static int
1376 yaml_parser_fetch_directive(yaml_parser_t *parser)
1377 {
1378 yaml_token_t token;
1379
1380 /* Reset the indentation level. */
1381
1382 if (!yaml_parser_unroll_indent(parser, -1))
1383 return 0;
1384
1385 /* Reset simple keys. */
1386
1387 if (!yaml_parser_remove_simple_key(parser))
1388 return 0;
1389
1390 parser->simple_key_allowed = 0;
1391
1392 /* Create the YAML-DIRECTIVE or TAG-DIRECTIVE token. */
1393
1394 if (!yaml_parser_scan_directive(parser, &token))
1395 return 0;
1396
1397 /* Append the token to the queue. */
1398
1399 if (!ENQUEUE(parser, parser->tokens, token)) {
1400 yaml_token_delete(&token);
1401 return 0;
1402 }
1403
1404 return 1;
1405 }
1406
1407 /*
1408 * Produce the DOCUMENT-START or DOCUMENT-END token.
1409 */
1410
1411 static int
1412 yaml_parser_fetch_document_indicator(yaml_parser_t *parser,
1413 yaml_token_type_t type)
1414 {
1415 yaml_mark_t start_mark, end_mark;
1416 yaml_token_t token;
1417
1418 /* Reset the indentation level. */
1419
1420 if (!yaml_parser_unroll_indent(parser, -1))
1421 return 0;
1422
1423 /* Reset simple keys. */
1424
1425 if (!yaml_parser_remove_simple_key(parser))
1426 return 0;
1427
1428 parser->simple_key_allowed = 0;
1429
1430 /* Consume the token. */
1431
1432 start_mark = parser->mark;
1433
1434 SKIP(parser);
1435 SKIP(parser);
1436 SKIP(parser);
1437
1438 end_mark = parser->mark;
1439
1440 /* Create the DOCUMENT-START or DOCUMENT-END token. */
1441
1442 TOKEN_INIT(token, type, start_mark, end_mark);
1443
1444 /* Append the token to the queue. */
1445
1446 if (!ENQUEUE(parser, parser->tokens, token))
1447 return 0;
1448
1449 return 1;
1450 }
1451
1452 /*
1453 * Produce the FLOW-SEQUENCE-START or FLOW-MAPPING-START token.
1454 */
1455
1456 static int
1457 yaml_parser_fetch_flow_collection_start(yaml_parser_t *parser,
1458 yaml_token_type_t type)
1459 {
1460 yaml_mark_t start_mark, end_mark;
1461 yaml_token_t token;
1462
1463 /* The indicators '[' and '{' may start a simple key. */
1464
1465 if (!yaml_parser_save_simple_key(parser))
1466 return 0;
1467
1468 /* Increase the flow level. */
1469
1470 if (!yaml_parser_increase_flow_level(parser))
1471 return 0;
1472
1473 /* A simple key may follow the indicators '[' and '{'. */
1474
1475 parser->simple_key_allowed = 1;
1476
1477 /* Consume the token. */
1478
1479 start_mark = parser->mark;
1480 SKIP(parser);
1481 end_mark = parser->mark;
1482
1483 /* Create the FLOW-SEQUENCE-START of FLOW-MAPPING-START token. */
1484
1485 TOKEN_INIT(token, type, start_mark, end_mark);
1486
1487 /* Append the token to the queue. */
1488
1489 if (!ENQUEUE(parser, parser->tokens, token))
1490 return 0;
1491
1492 return 1;
1493 }
1494
1495 /*
1496 * Produce the FLOW-SEQUENCE-END or FLOW-MAPPING-END token.
1497 */
1498
1499 static int
1500 yaml_parser_fetch_flow_collection_end(yaml_parser_t *parser,
1501 yaml_token_type_t type)
1502 {
1503 yaml_mark_t start_mark, end_mark;
1504 yaml_token_t token;
1505
1506 /* Reset any potential simple key on the current flow level. */
1507
1508 if (!yaml_parser_remove_simple_key(parser))
1509 return 0;
1510
1511 /* Decrease the flow level. */
1512
1513 if (!yaml_parser_decrease_flow_level(parser))
1514 return 0;
1515
1516 /* No simple keys after the indicators ']' and '}'. */
1517
1518 parser->simple_key_allowed = 0;
1519
1520 /* Consume the token. */
1521
1522 start_mark = parser->mark;
1523 SKIP(parser);
1524 end_mark = parser->mark;
1525
1526 /* Create the FLOW-SEQUENCE-END of FLOW-MAPPING-END token. */
1527
1528 TOKEN_INIT(token, type, start_mark, end_mark);
1529
1530 /* Append the token to the queue. */
1531
1532 if (!ENQUEUE(parser, parser->tokens, token))
1533 return 0;
1534
1535 return 1;
1536 }
1537
1538 /*
1539 * Produce the FLOW-ENTRY token.
1540 */
1541
1542 static int
1543 yaml_parser_fetch_flow_entry(yaml_parser_t *parser)
1544 {
1545 yaml_mark_t start_mark, end_mark;
1546 yaml_token_t token;
1547
1548 /* Reset any potential simple keys on the current flow level. */
1549
1550 if (!yaml_parser_remove_simple_key(parser))
1551 return 0;
1552
1553 /* Simple keys are allowed after ','. */
1554
1555 parser->simple_key_allowed = 1;
1556
1557 /* Consume the token. */
1558
1559 start_mark = parser->mark;
1560 SKIP(parser);
1561 end_mark = parser->mark;
1562
1563 /* Create the FLOW-ENTRY token and append it to the queue. */
1564
1565 TOKEN_INIT(token, YAML_FLOW_ENTRY_TOKEN, start_mark, end_mark);
1566
1567 if (!ENQUEUE(parser, parser->tokens, token))
1568 return 0;
1569
1570 return 1;
1571 }
1572
1573 /*
1574 * Produce the BLOCK-ENTRY token.
1575 */
1576
1577 static int
1578 yaml_parser_fetch_block_entry(yaml_parser_t *parser)
1579 {
1580 yaml_mark_t start_mark, end_mark;
1581 yaml_token_t token;
1582
1583 /* Check if the scanner is in the block context. */
1584
1585 if (!parser->flow_level)
1586 {
1587 /* Check if we are allowed to start a new entry. */
1588
1589 if (!parser->simple_key_allowed) {
1590 return yaml_parser_set_scanner_error(parser, NULL, parser->mark,
1591 "block sequence entries are not allowed in this context");
1592 }
1593
1594 /* Add the BLOCK-SEQUENCE-START token if needed. */
1595
1596 if (!yaml_parser_roll_indent(parser, parser->mark.column, -1,
1597 YAML_BLOCK_SEQUENCE_START_TOKEN, parser->mark))
1598 return 0;
1599 }
1600 else
1601 {
1602 /*
1603 * It is an error for the '-' indicator to occur in the flow context,
1604 * but we let the Parser detect and report about it because the Parser
1605 * is able to point to the context.
1606 */
1607 }
1608
1609 /* Reset any potential simple keys on the current flow level. */
1610
1611 if (!yaml_parser_remove_simple_key(parser))
1612 return 0;
1613
1614 /* Simple keys are allowed after '-'. */
1615
1616 parser->simple_key_allowed = 1;
1617
1618 /* Consume the token. */
1619
1620 start_mark = parser->mark;
1621 SKIP(parser);
1622 end_mark = parser->mark;
1623
1624 /* Create the BLOCK-ENTRY token and append it to the queue. */
1625
1626 TOKEN_INIT(token, YAML_BLOCK_ENTRY_TOKEN, start_mark, end_mark);
1627
1628 if (!ENQUEUE(parser, parser->tokens, token))
1629 return 0;
1630
1631 return 1;
1632 }
1633
1634 /*
1635 * Produce the KEY token.
1636 */
1637
1638 static int
1639 yaml_parser_fetch_key(yaml_parser_t *parser)
1640 {
1641 yaml_mark_t start_mark, end_mark;
1642 yaml_token_t token;
1643
1644 /* In the block context, additional checks are required. */
1645
1646 if (!parser->flow_level)
1647 {
1648 /* Check if we are allowed to start a new key (not nessesary simple). */
1649
1650 if (!parser->simple_key_allowed) {
1651 return yaml_parser_set_scanner_error(parser, NULL, parser->mark,
1652 "mapping keys are not allowed in this context");
1653 }
1654
1655 /* Add the BLOCK-MAPPING-START token if needed. */
1656
1657 if (!yaml_parser_roll_indent(parser, parser->mark.column, -1,
1658 YAML_BLOCK_MAPPING_START_TOKEN, parser->mark))
1659 return 0;
1660 }
1661
1662 /* Reset any potential simple keys on the current flow level. */
1663
1664 if (!yaml_parser_remove_simple_key(parser))
1665 return 0;
1666
1667 /* Simple keys are allowed after '?' in the block context. */
1668
1669 parser->simple_key_allowed = (!parser->flow_level);
1670
1671 /* Consume the token. */
1672
1673 start_mark = parser->mark;
1674 SKIP(parser);
1675 end_mark = parser->mark;
1676
1677 /* Create the KEY token and append it to the queue. */
1678
1679 TOKEN_INIT(token, YAML_KEY_TOKEN, start_mark, end_mark);
1680
1681 if (!ENQUEUE(parser, parser->tokens, token))
1682 return 0;
1683
1684 return 1;
1685 }
1686
1687 /*
1688 * Produce the VALUE token.
1689 */
1690
1691 static int
1692 yaml_parser_fetch_value(yaml_parser_t *parser)
1693 {
1694 yaml_mark_t start_mark, end_mark;
1695 yaml_token_t token;
1696 yaml_simple_key_t *simple_key = parser->simple_keys.top-1;
1697
1698 /* Have we found a simple key? */
1699
1700 if (simple_key->possible)
1701 {
1702
1703 /* Create the KEY token and insert it into the queue. */
1704
1705 TOKEN_INIT(token, YAML_KEY_TOKEN, simple_key->mark, simple_key->mark);
1706
1707 if (!QUEUE_INSERT(parser, parser->tokens,
1708 simple_key->token_number - parser->tokens_parsed, token))
1709 return 0;
1710
1711 /* In the block context, we may need to add the BLOCK-MAPPING-START token. */
1712
1713 if (!yaml_parser_roll_indent(parser, simple_key->mark.column,
1714 simple_key->token_number,
1715 YAML_BLOCK_MAPPING_START_TOKEN, simple_key->mark))
1716 return 0;
1717
1718 /* Remove the simple key. */
1719
1720 simple_key->possible = 0;
1721
1722 /* A simple key cannot follow another simple key. */
1723
1724 parser->simple_key_allowed = 0;
1725 }
1726 else
1727 {
1728 /* The ':' indicator follows a complex key. */
1729
1730 /* In the block context, extra checks are required. */
1731
1732 if (!parser->flow_level)
1733 {
1734 /* Check if we are allowed to start a complex value. */
1735
1736 if (!parser->simple_key_allowed) {
1737 return yaml_parser_set_scanner_error(parser, NULL, parser->mark,
1738 "mapping values are not allowed in this context");
1739 }
1740
1741 /* Add the BLOCK-MAPPING-START token if needed. */
1742
1743 if (!yaml_parser_roll_indent(parser, parser->mark.column, -1,
1744 YAML_BLOCK_MAPPING_START_TOKEN, parser->mark))
1745 return 0;
1746 }
1747
1748 /* Simple keys after ':' are allowed in the block context. */
1749
1750 parser->simple_key_allowed = (!parser->flow_level);
1751 }
1752
1753 /* Consume the token. */
1754
1755 start_mark = parser->mark;
1756 SKIP(parser);
1757 end_mark = parser->mark;
1758
1759 /* Create the VALUE token and append it to the queue. */
1760
1761 TOKEN_INIT(token, YAML_VALUE_TOKEN, start_mark, end_mark);
1762
1763 if (!ENQUEUE(parser, parser->tokens, token))
1764 return 0;
1765
1766 return 1;
1767 }
1768
1769 /*
1770 * Produce the ALIAS or ANCHOR token.
1771 */
1772
1773 static int
1774 yaml_parser_fetch_anchor(yaml_parser_t *parser, yaml_token_type_t type)
1775 {
1776 yaml_token_t token;
1777
1778 /* An anchor or an alias could be a simple key. */
1779
1780 if (!yaml_parser_save_simple_key(parser))
1781 return 0;
1782
1783 /* A simple key cannot follow an anchor or an alias. */
1784
1785 parser->simple_key_allowed = 0;
1786
1787 /* Create the ALIAS or ANCHOR token and append it to the queue. */
1788
1789 if (!yaml_parser_scan_anchor(parser, &token, type))
1790 return 0;
1791
1792 if (!ENQUEUE(parser, parser->tokens, token)) {
1793 yaml_token_delete(&token);
1794 return 0;
1795 }
1796 return 1;
1797 }
1798
1799 /*
1800 * Produce the TAG token.
1801 */
1802
1803 static int
1804 yaml_parser_fetch_tag(yaml_parser_t *parser)
1805 {
1806 yaml_token_t token;
1807
1808 /* A tag could be a simple key. */
1809
1810 if (!yaml_parser_save_simple_key(parser))
1811 return 0;
1812
1813 /* A simple key cannot follow a tag. */
1814
1815 parser->simple_key_allowed = 0;
1816
1817 /* Create the TAG token and append it to the queue. */
1818
1819 if (!yaml_parser_scan_tag(parser, &token))
1820 return 0;
1821
1822 if (!ENQUEUE(parser, parser->tokens, token)) {
1823 yaml_token_delete(&token);
1824 return 0;
1825 }
1826
1827 return 1;
1828 }
1829
1830 /*
1831 * Produce the SCALAR(...,literal) or SCALAR(...,folded) tokens.
1832 */
1833
1834 static int
1835 yaml_parser_fetch_block_scalar(yaml_parser_t *parser, int literal)
1836 {
1837 yaml_token_t token;
1838
1839 /* Remove any potential simple keys. */
1840
1841 if (!yaml_parser_remove_simple_key(parser))
1842 return 0;
1843
1844 /* A simple key may follow a block scalar. */
1845
1846 parser->simple_key_allowed = 1;
1847
1848 /* Create the SCALAR token and append it to the queue. */
1849
1850 if (!yaml_parser_scan_block_scalar(parser, &token, literal))
1851 return 0;
1852
1853 if (!ENQUEUE(parser, parser->tokens, token)) {
1854 yaml_token_delete(&token);
1855 return 0;
1856 }
1857
1858 return 1;
1859 }
1860
1861 /*
1862 * Produce the SCALAR(...,single-quoted) or SCALAR(...,double-quoted) tokens.
1863 */
1864
1865 static int
1866 yaml_parser_fetch_flow_scalar(yaml_parser_t *parser, int single)
1867 {
1868 yaml_token_t token;
1869
1870 /* A plain scalar could be a simple key. */
1871
1872 if (!yaml_parser_save_simple_key(parser))
1873 return 0;
1874
1875 /* A simple key cannot follow a flow scalar. */
1876
1877 parser->simple_key_allowed = 0;
1878
1879 /* Create the SCALAR token and append it to the queue. */
1880
1881 if (!yaml_parser_scan_flow_scalar(parser, &token, single))
1882 return 0;
1883
1884 if (!ENQUEUE(parser, parser->tokens, token)) {
1885 yaml_token_delete(&token);
1886 return 0;
1887 }
1888
1889 return 1;
1890 }
1891
1892 /*
1893 * Produce the SCALAR(...,plain) token.
1894 */
1895
1896 static int
1897 yaml_parser_fetch_plain_scalar(yaml_parser_t *parser)
1898 {
1899 yaml_token_t token;
1900
1901 /* A plain scalar could be a simple key. */
1902
1903 if (!yaml_parser_save_simple_key(parser))
1904 return 0;
1905
1906 /* A simple key cannot follow a flow scalar. */
1907
1908 parser->simple_key_allowed = 0;
1909
1910 /* Create the SCALAR token and append it to the queue. */
1911
1912 if (!yaml_parser_scan_plain_scalar(parser, &token))
1913 return 0;
1914
1915 if (!ENQUEUE(parser, parser->tokens, token)) {
1916 yaml_token_delete(&token);
1917 return 0;
1918 }
1919
1920 return 1;
1921 }
1922
1923 /*
1924 * Eat whitespaces and comments until the next token is found.
1925 */
1926
1927 static int
1928 yaml_parser_scan_to_next_token(yaml_parser_t *parser)
1929 {
1930 /* Until the next token is not found. */
1931
1932 while (1)
1933 {
1934 /* Allow the BOM mark to start a line. */
1935
1936 if (!CACHE(parser, 1)) return 0;
1937
1938 if (parser->mark.column == 0 && IS_BOM(parser->buffer))
1939 SKIP(parser);
1940
1941 /*
1942 * Eat whitespaces.
1943 *
1944 * Tabs are allowed:
1945 *
1946 * - in the flow context;
1947 * - in the block context, but not at the beginning of the line or
1948 * after '-', '?', or ':' (complex value).
1949 */
1950
1951 if (!CACHE(parser, 1)) return 0;
1952
1953 while (CHECK(parser->buffer,' ') ||
1954 ((parser->flow_level || !parser->simple_key_allowed) &&
1955 CHECK(parser->buffer, '\t'))) {
1956 SKIP(parser);
1957 if (!CACHE(parser, 1)) return 0;
1958 }
1959
1960 /* Eat a comment until a line break. */
1961
1962 if (CHECK(parser->buffer, '#')) {
1963 while (!IS_BREAKZ(parser->buffer)) {
1964 SKIP(parser);
1965 if (!CACHE(parser, 1)) return 0;
1966 }
1967 }
1968
1969 /* If it is a line break, eat it. */
1970
1971 if (IS_BREAK(parser->buffer))
1972 {
1973 if (!CACHE(parser, 2)) return 0;
1974 SKIP_LINE(parser);
1975
1976 /* In the block context, a new line may start a simple key. */
1977
1978 if (!parser->flow_level) {
1979 parser->simple_key_allowed = 1;
1980 }
1981 }
1982 else
1983 {
1984 /* We have found a token. */
1985
1986 break;
1987 }
1988 }
1989
1990 return 1;
1991 }
1992
1993 /*
1994 * Scan a YAML-DIRECTIVE or TAG-DIRECTIVE token.
1995 *
1996 * Scope:
1997 * %YAML 1.1 # a comment \n
1998 * ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
1999 * %TAG !yaml! tag:yaml.org,2002: \n
2000 * ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
2001 */
2002
2003 int
2004 yaml_parser_scan_directive(yaml_parser_t *parser, yaml_token_t *token)
2005 {
2006 yaml_mark_t start_mark, end_mark;
2007 yaml_char_t *name = NULL;
2008 int major, minor;
2009 yaml_char_t *handle = NULL, *prefix = NULL;
2010
2011 /* Eat '%'. */
2012
2013 start_mark = parser->mark;
2014
2015 SKIP(parser);
2016
2017 /* Scan the directive name. */
2018
2019 if (!yaml_parser_scan_directive_name(parser, start_mark, &name))
2020 goto error;
2021
2022 /* Is it a YAML directive? */
2023
2024 if (strcmp((char *)name, "YAML") == 0)
2025 {
2026 /* Scan the VERSION directive value. */
2027
2028 if (!yaml_parser_scan_version_directive_value(parser, start_mark,
2029 &major, &minor))
2030 goto error;
2031
2032 end_mark = parser->mark;
2033
2034 /* Create a VERSION-DIRECTIVE token. */
2035
2036 VERSION_DIRECTIVE_TOKEN_INIT(*token, major, minor,
2037 start_mark, end_mark);
2038 }
2039
2040 /* Is it a TAG directive? */
2041
2042 else if (strcmp((char *)name, "TAG") == 0)
2043 {
2044 /* Scan the TAG directive value. */
2045
2046 if (!yaml_parser_scan_tag_directive_value(parser, start_mark,
2047 &handle, &prefix))
2048 goto error;
2049
2050 end_mark = parser->mark;
2051
2052 /* Create a TAG-DIRECTIVE token. */
2053
2054 TAG_DIRECTIVE_TOKEN_INIT(*token, handle, prefix,
2055 start_mark, end_mark);
2056 }
2057
2058 /* Unknown directive. */
2059
2060 else
2061 {
2062 yaml_parser_set_scanner_error(parser, "while scanning a directive",
2063 start_mark, "found uknown directive name");
2064 goto error;
2065 }
2066
2067 /* Eat the rest of the line including any comments. */
2068
2069 if (!CACHE(parser, 1)) goto error;
2070
2071 while (IS_BLANK(parser->buffer)) {
2072 SKIP(parser);
2073 if (!CACHE(parser, 1)) goto error;
2074 }
2075
2076 if (CHECK(parser->buffer, '#')) {
2077 while (!IS_BREAKZ(parser->buffer)) {
2078 SKIP(parser);
2079 if (!CACHE(parser, 1)) goto error;
2080 }
2081 }
2082
2083 /* Check if we are at the end of the line. */
2084
2085 if (!IS_BREAKZ(parser->buffer)) {
2086 yaml_parser_set_scanner_error(parser, "while scanning a directive",
2087 start_mark, "did not find expected comment or line break");
2088 goto error;
2089 }
2090
2091 /* Eat a line break. */
2092
2093 if (IS_BREAK(parser->buffer)) {
2094 if (!CACHE(parser, 2)) goto error;
2095 SKIP_LINE(parser);
2096 }
2097
2098 yaml_free(name);
2099
2100 return 1;
2101
2102 error:
2103 yaml_free(prefix);
2104 yaml_free(handle);
2105 yaml_free(name);
2106 return 0;
2107 }
2108
2109 /*
2110 * Scan the directive name.
2111 *
2112 * Scope:
2113 * %YAML 1.1 # a comment \n
2114 * ^^^^
2115 * %TAG !yaml! tag:yaml.org,2002: \n
2116 * ^^^
2117 */
2118
2119 static int
2120 yaml_parser_scan_directive_name(yaml_parser_t *parser,
2121 yaml_mark_t start_mark, yaml_char_t **name)
2122 {
2123 yaml_string_t string = NULL_STRING;
2124
2125 if (!STRING_INIT(parser, string, INITIAL_STRING_SIZE)) goto error;
2126
2127 /* Consume the directive name. */
2128
2129 if (!CACHE(parser, 1)) goto error;
2130
2131 while (IS_ALPHA(parser->buffer))
2132 {
2133 if (!READ(parser, string)) goto error;
2134 if (!CACHE(parser, 1)) goto error;
2135 }
2136
2137 /* Check if the name is empty. */
2138
2139 if (string.start == string.pointer) {
2140 yaml_parser_set_scanner_error(parser, "while scanning a directive",
2141 start_mark, "could not find expected directive name");
2142 goto error;
2143 }
2144
2145 /* Check for an blank character after the name. */
2146
2147 if (!IS_BLANKZ(parser->buffer)) {
2148 yaml_parser_set_scanner_error(parser, "while scanning a directive",
2149 start_mark, "found unexpected non-alphabetical character");
2150 goto error;
2151 }
2152
2153 *name = string.start;
2154
2155 return 1;
2156
2157 error:
2158 STRING_DEL(parser, string);
2159 return 0;
2160 }
2161
2162 /*
2163 * Scan the value of VERSION-DIRECTIVE.
2164 *
2165 * Scope:
2166 * %YAML 1.1 # a comment \n
2167 * ^^^^^^
2168 */
2169
2170 static int
2171 yaml_parser_scan_version_directive_value(yaml_parser_t *parser,
2172 yaml_mark_t start_mark, int *major, int *minor)
2173 {
2174 /* Eat whitespaces. */
2175
2176 if (!CACHE(parser, 1)) return 0;
2177
2178 while (IS_BLANK(parser->buffer)) {
2179 SKIP(parser);
2180 if (!CACHE(parser, 1)) return 0;
2181 }
2182
2183 /* Consume the major version number. */
2184
2185 if (!yaml_parser_scan_version_directive_number(parser, start_mark, major))
2186 return 0;
2187
2188 /* Eat '.'. */
2189
2190 if (!CHECK(parser->buffer, '.')) {
2191 return yaml_parser_set_scanner_error(parser, "while scanning a %YAML directive",
2192 start_mark, "did not find expected digit or '.' character");
2193 }
2194
2195 SKIP(parser);
2196
2197 /* Consume the minor version number. */
2198
2199 if (!yaml_parser_scan_version_directive_number(parser, start_mark, minor))
2200 return 0;
2201
2202 return 1;
2203 }
2204
2205 #define MAX_NUMBER_LENGTH 9
2206
2207 /*
2208 * Scan the version number of VERSION-DIRECTIVE.
2209 *
2210 * Scope:
2211 * %YAML 1.1 # a comment \n
2212 * ^
2213 * %YAML 1.1 # a comment \n
2214 * ^
2215 */
2216
2217 static int
2218 yaml_parser_scan_version_directive_number(yaml_parser_t *parser,
2219 yaml_mark_t start_mark, int *number)
2220 {
2221 int value = 0;
2222 size_t length = 0;
2223
2224 /* Repeat while the next character is digit. */
2225
2226 if (!CACHE(parser, 1)) return 0;
2227
2228 while (IS_DIGIT(parser->buffer))
2229 {
2230 /* Check if the number is too long. */
2231
2232 if (++length > MAX_NUMBER_LENGTH) {
2233 return yaml_parser_set_scanner_error(parser, "while scanning a %YAML directive",
2234 start_mark, "found extremely long version number");
2235 }
2236
2237 value = value*10 + AS_DIGIT(parser->buffer);
2238
2239 SKIP(parser);
2240
2241 if (!CACHE(parser, 1)) return 0;
2242 }
2243
2244 /* Check if the number was present. */
2245
2246 if (!length) {
2247 return yaml_parser_set_scanner_error(parser, "while scanning a %YAML directive",
2248 start_mark, "did not find expected version number");
2249 }
2250
2251 *number = value;
2252
2253 return 1;
2254 }
2255
2256 /*
2257 * Scan the value of a TAG-DIRECTIVE token.
2258 *
2259 * Scope:
2260 * %TAG !yaml! tag:yaml.org,2002: \n
2261 * ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
2262 */
2263
2264 static int
2265 yaml_parser_scan_tag_directive_value(yaml_parser_t *parser,
2266 yaml_mark_t start_mark, yaml_char_t **handle, yaml_char_t **prefix)
2267 {
2268 yaml_char_t *handle_value = NULL;
2269 yaml_char_t *prefix_value = NULL;
2270
2271 /* Eat whitespaces. */
2272
2273 if (!CACHE(parser, 1)) goto error;
2274
2275 while (IS_BLANK(parser->buffer)) {
2276 SKIP(parser);
2277 if (!CACHE(parser, 1)) goto error;
2278 }
2279
2280 /* Scan a handle. */
2281
2282 if (!yaml_parser_scan_tag_handle(parser, 1, start_mark, &handle_value))
2283 goto error;
2284
2285 /* Expect a whitespace. */
2286
2287 if (!CACHE(parser, 1)) goto error;
2288
2289 if (!IS_BLANK(parser->buffer)) {
2290 yaml_parser_set_scanner_error(parser, "while scanning a %TAG directive",
2291 start_mark, "did not find expected whitespace");
2292 goto error;
2293 }
2294
2295 /* Eat whitespaces. */
2296
2297 while (IS_BLANK(parser->buffer)) {
2298 SKIP(parser);
2299 if (!CACHE(parser, 1)) goto error;
2300 }
2301
2302 /* Scan a prefix. */
2303
2304 if (!yaml_parser_scan_tag_uri(parser, 1, NULL, start_mark, &prefix_value))
2305 goto error;
2306
2307 /* Expect a whitespace or line break. */
2308
2309 if (!CACHE(parser, 1)) goto error;
2310
2311 if (!IS_BLANKZ(parser->buffer)) {
2312 yaml_parser_set_scanner_error(parser, "while scanning a %TAG directive",
2313 start_mark, "did not find expected whitespace or line break");
2314 goto error;
2315 }
2316
2317 *handle = handle_value;
2318 *prefix = prefix_value;
2319
2320 return 1;
2321
2322 error:
2323 yaml_free(handle_value);
2324 yaml_free(prefix_value);
2325 return 0;
2326 }
2327
2328 static int
2329 yaml_parser_scan_anchor(yaml_parser_t *parser, yaml_token_t *token,
2330 yaml_token_type_t type)
2331 {
2332 int length = 0;
2333 yaml_mark_t start_mark, end_mark;
2334 yaml_string_t string = NULL_STRING;
2335
2336 if (!STRING_INIT(parser, string, INITIAL_STRING_SIZE)) goto error;
2337
2338 /* Eat the indicator character. */
2339
2340 start_mark = parser->mark;
2341
2342 SKIP(parser);
2343
2344 /* Consume the value. */
2345
2346 if (!CACHE(parser, 1)) goto error;
2347
2348 while (IS_ALPHA(parser->buffer)) {
2349 if (!READ(parser, string)) goto error;
2350 if (!CACHE(parser, 1)) goto error;
2351 length ++;
2352 }
2353
2354 end_mark = parser->mark;
2355
2356 /*
2357 * Check if length of the anchor is greater than 0 and it is followed by
2358 * a whitespace character or one of the indicators:
2359 *
2360 * '?', ':', ',', ']', '}', '%', '@', '`'.
2361 */
2362
2363 if (!length || !(IS_BLANKZ(parser->buffer) || CHECK(parser->buffer, '?')
2364 || CHECK(parser->buffer, ':') || CHECK(parser->buffer, ',')
2365 || CHECK(parser->buffer, ']') || CHECK(parser->buffer, '}')
2366 || CHECK(parser->buffer, '%') || CHECK(parser->buffer, '@')
2367 || CHECK(parser->buffer, '`'))) {
2368 yaml_parser_set_scanner_error(parser, type == YAML_ANCHOR_TOKEN ?
2369 "while scanning an anchor" : "while scanning an alias", start_mark,
2370 "did not find expected alphabetic or numeric character");
2371 goto error;
2372 }
2373
2374 /* Create a token. */
2375
2376 if (type == YAML_ANCHOR_TOKEN) {
2377 ANCHOR_TOKEN_INIT(*token, string.start, start_mark, end_mark);
2378 }
2379 else {
2380 ALIAS_TOKEN_INIT(*token, string.start, start_mark, end_mark);
2381 }
2382
2383 return 1;
2384
2385 error:
2386 STRING_DEL(parser, string);
2387 return 0;
2388 }
2389
2390 /*
2391 * Scan a TAG token.
2392 */
2393
2394 static int
2395 yaml_parser_scan_tag(yaml_parser_t *parser, yaml_token_t *token)
2396 {
2397 yaml_char_t *handle = NULL;
2398 yaml_char_t *suffix = NULL;
2399 yaml_mark_t start_mark, end_mark;
2400
2401 start_mark = parser->mark;
2402
2403 /* Check if the tag is in the canonical form. */
2404
2405 if (!CACHE(parser, 2)) goto error;
2406
2407 if (CHECK_AT(parser->buffer, '<', 1))
2408 {
2409 /* Set the handle to '' */
2410
2411 handle = yaml_malloc(1);
2412 if (!handle) goto error;
2413 handle[0] = '\0';
2414
2415 /* Eat '!<' */
2416
2417 SKIP(parser);
2418 SKIP(parser);
2419
2420 /* Consume the tag value. */
2421
2422 if (!yaml_parser_scan_tag_uri(parser, 0, NULL, start_mark, &suffix))
2423 goto error;
2424
2425 /* Check for '>' and eat it. */
2426
2427 if (!CHECK(parser->buffer, '>')) {
2428 yaml_parser_set_scanner_error(parser, "while scanning a tag",
2429 start_mark, "did not find the expected '>'");
2430 goto error;
2431 }
2432
2433 SKIP(parser);
2434 }
2435 else
2436 {
2437 /* The tag has either the '!suffix' or the '!handle!suffix' form. */
2438
2439 /* First, try to scan a handle. */
2440
2441 if (!yaml_parser_scan_tag_handle(parser, 0, start_mark, &handle))
2442 goto error;
2443
2444 /* Check if it is, indeed, handle. */
2445
2446 if (handle[0] == '!' && handle[1] != '\0' && handle[strlen((char *)handle)-1] == '!')
2447 {
2448 /* Scan the suffix now. */
2449
2450 if (!yaml_parser_scan_tag_uri(parser, 0, NULL, start_mark, &suffix))
2451 goto error;
2452 }
2453 else
2454 {
2455 /* It wasn't a handle after all. Scan the rest of the tag. */
2456
2457 if (!yaml_parser_scan_tag_uri(parser, 0, handle, start_mark, &suffix))
2458 goto error;
2459
2460 /* Set the handle to '!'. */
2461
2462 yaml_free(handle);
2463 handle = yaml_malloc(2);
2464 if (!handle) goto error;
2465 handle[0] = '!';
2466 handle[1] = '\0';
2467
2468 /*
2469 * A special case: the '!' tag. Set the handle to '' and the
2470 * suffix to '!'.
2471 */
2472
2473 if (suffix[0] == '\0') {
2474 yaml_char_t *tmp = handle;
2475 handle = suffix;
2476 suffix = tmp;
2477 }
2478 }
2479 }
2480
2481 /* Check the character which ends the tag. */
2482
2483 if (!CACHE(parser, 1)) goto error;
2484
2485 if (!IS_BLANKZ(parser->buffer)) {
2486 yaml_parser_set_scanner_error(parser, "while scanning a tag",
2487 start_mark, "did not find expected whitespace or line break");
2488 goto error;
2489 }
2490
2491 end_mark = parser->mark;
2492
2493 /* Create a token. */
2494
2495 TAG_TOKEN_INIT(*token, handle, suffix, start_mark, end_mark);
2496
2497 return 1;
2498
2499 error:
2500 yaml_free(handle);
2501 yaml_free(suffix);
2502 return 0;
2503 }
2504
2505 /*
2506 * Scan a tag handle.
2507 */
2508
2509 static int
2510 yaml_parser_scan_tag_handle(yaml_parser_t *parser, int directive,
2511 yaml_mark_t start_mark, yaml_char_t **handle)
2512 {
2513 yaml_string_t string = NULL_STRING;
2514
2515 if (!STRING_INIT(parser, string, INITIAL_STRING_SIZE)) goto error;
2516
2517 /* Check the initial '!' character. */
2518
2519 if (!CACHE(parser, 1)) goto error;
2520
2521 if (!CHECK(parser->buffer, '!')) {
2522 yaml_parser_set_scanner_error(parser, directive ?
2523 "while scanning a tag directive" : "while scanning a tag",
2524 start_mark, "did not find expected '!'");
2525 goto error;
2526 }
2527
2528 /* Copy the '!' character. */
2529
2530 if (!READ(parser, string)) goto error;
2531
2532 /* Copy all subsequent alphabetical and numerical characters. */
2533
2534 if (!CACHE(parser, 1)) goto error;
2535
2536 while (IS_ALPHA(parser->buffer))
2537 {
2538 if (!READ(parser, string)) goto error;
2539 if (!CACHE(parser, 1)) goto error;
2540 }
2541
2542 /* Check if the trailing character is '!' and copy it. */
2543
2544 if (CHECK(parser->buffer, '!'))
2545 {
2546 if (!READ(parser, string)) goto error;
2547 }
2548 else
2549 {
2550 /*
2551 * It's either the '!' tag or not really a tag handle. If it's a %TAG
2552 * directive, it's an error. If it's a tag token, it must be a part of
2553 * URI.
2554 */
2555
2556 if (directive && !(string.start[0] == '!' && string.start[1] == '\0')) {
2557 yaml_parser_set_scanner_error(parser, "while parsing a tag directive",
2558 start_mark, "did not find expected '!'");
2559 goto error;
2560 }
2561 }
2562
2563 *handle = string.start;
2564
2565 return 1;
2566
2567 error:
2568 STRING_DEL(parser, string);
2569 return 0;
2570 }
2571
2572 /*
2573 * Scan a tag.
2574 */
2575
2576 static int
2577 yaml_parser_scan_tag_uri(yaml_parser_t *parser, int directive,
2578 yaml_char_t *head, yaml_mark_t start_mark, yaml_char_t **uri)
2579 {
2580 size_t length = head ? strlen((char *)head) : 0;
2581 yaml_string_t string = NULL_STRING;
2582
2583 if (!STRING_INIT(parser, string, INITIAL_STRING_SIZE)) goto error;
2584
2585 /* Resize the string to include the head. */
2586
2587 while ((size_t)(string.end - string.start) <= length) {
2588 if (!yaml_string_extend(&string.start, &string.pointer, &string.end)) {
2589 parser->error = YAML_MEMORY_ERROR;
2590 goto error;
2591 }
2592 }
2593
2594 /*
2595 * Copy the head if needed.
2596 *
2597 * Note that we don't copy the leading '!' character.
2598 */
2599
2600 if (length > 1) {
2601 memcpy(string.start, head+1, length-1);
2602 string.pointer += length-1;
2603 }
2604
2605 /* Scan the tag. */
2606
2607 if (!CACHE(parser, 1)) goto error;
2608
2609 /*
2610 * The set of characters that may appear in URI is as follows:
2611 *
2612 * '0'-'9', 'A'-'Z', 'a'-'z', '_', '-', ';', '/', '?', ':', '@', '&',
2613 * '=', '+', '$', ',', '.', '!', '~', '*', '\'', '(', ')', '[', ']',
2614 * '%'.
2615 */
2616
2617 while (IS_ALPHA(parser->buffer) || CHECK(parser->buffer, ';')
2618 || CHECK(parser->buffer, '/') || CHECK(parser->buffer, '?')
2619 || CHECK(parser->buffer, ':') || CHECK(parser->buffer, '@')
2620 || CHECK(parser->buffer, '&') || CHECK(parser->buffer, '=')
2621 || CHECK(parser->buffer, '+') || CHECK(parser->buffer, '$')
2622 || CHECK(parser->buffer, ',') || CHECK(parser->buffer, '.')
2623 || CHECK(parser->buffer, '!') || CHECK(parser->buffer, '~')
2624 || CHECK(parser->buffer, '*') || CHECK(parser->buffer, '\'')
2625 || CHECK(parser->buffer, '(') || CHECK(parser->buffer, ')')
2626 || CHECK(parser->buffer, '[') || CHECK(parser->buffer, ']')
2627 || CHECK(parser->buffer, '%'))
2628 {
2629 /* Check if it is a URI-escape sequence. */
2630
2631 if (CHECK(parser->buffer, '%')) {
2632 if (!STRING_EXTEND(parser, string))
2633 goto error;
2634
2635 if (!yaml_parser_scan_uri_escapes(parser,
2636 directive, start_mark, &string)) goto error;
2637 }
2638 else {
2639 if (!READ(parser, string)) goto error;
2640 }
2641
2642 length ++;
2643 if (!CACHE(parser, 1)) goto error;
2644 }
2645
2646 /* Check if the tag is non-empty. */
2647
2648 if (!length) {
2649 if (!STRING_EXTEND(parser, string))
2650 goto error;
2651
2652 yaml_parser_set_scanner_error(parser, directive ?
2653 "while parsing a %TAG directive" : "while parsing a tag",
2654 start_mark, "did not find expected tag URI");
2655 goto error;
2656 }
2657
2658 *uri = string.start;
2659
2660 return 1;
2661
2662 error:
2663 STRING_DEL(parser, string);
2664 return 0;
2665 }
2666
2667 /*
2668 * Decode an URI-escape sequence corresponding to a single UTF-8 character.
2669 */
2670
2671 static int
2672 yaml_parser_scan_uri_escapes(yaml_parser_t *parser, int directive,
2673 yaml_mark_t start_mark, yaml_string_t *string)
2674 {
2675 int width = 0;
2676
2677 /* Decode the required number of characters. */
2678
2679 do {
2680
2681 unsigned char octet = 0;
2682
2683 /* Check for a URI-escaped octet. */
2684
2685 if (!CACHE(parser, 3)) return 0;
2686
2687 if (!(CHECK(parser->buffer, '%')
2688 && IS_HEX_AT(parser->buffer, 1)
2689 && IS_HEX_AT(parser->buffer, 2))) {
2690 return yaml_parser_set_scanner_error(parser, directive ?
2691 "while parsing a %TAG directive" : "while parsing a tag",
2692 start_mark, "did not find URI escaped octet");
2693 }
2694
2695 /* Get the octet. */
2696
2697 octet = (AS_HEX_AT(parser->buffer, 1) << 4) + AS_HEX_AT(parser->buffer, 2);
2698
2699 /* If it is the leading octet, determine the length of the UTF-8 sequence. */
2700
2701 if (!width)
2702 {
2703 width = (octet & 0x80) == 0x00 ? 1 :
2704 (octet & 0xE0) == 0xC0 ? 2 :
2705 (octet & 0xF0) == 0xE0 ? 3 :
2706 (octet & 0xF8) == 0xF0 ? 4 : 0;
2707 if (!width) {
2708 return yaml_parser_set_scanner_error(parser, directive ?
2709 "while parsing a %TAG directive" : "while parsing a tag",
2710 start_mark, "found an incorrect leading UTF-8 octet");
2711 }
2712 }
2713 else
2714 {
2715 /* Check if the trailing octet is correct. */
2716
2717 if ((octet & 0xC0) != 0x80) {
2718 return yaml_parser_set_scanner_error(parser, directive ?
2719 "while parsing a %TAG directive" : "while parsing a tag",
2720 start_mark, "found an incorrect trailing UTF-8 octet");
2721 }
2722 }
2723
2724 /* Copy the octet and move the pointers. */
2725
2726 *(string->pointer++) = octet;
2727 SKIP(parser);
2728 SKIP(parser);
2729 SKIP(parser);
2730
2731 } while (--width);
2732
2733 return 1;
2734 }
2735
2736 /*
2737 * Scan a block scalar.
2738 */
2739
2740 static int
2741 yaml_parser_scan_block_scalar(yaml_parser_t *parser, yaml_token_t *token,
2742 int literal)
2743 {
2744 yaml_mark_t start_mark;
2745 yaml_mark_t end_mark;
2746 yaml_string_t string = NULL_STRING;
2747 yaml_string_t leading_break = NULL_STRING;
2748 yaml_string_t trailing_breaks = NULL_STRING;
2749 int chomping = 0;
2750 int increment = 0;
2751 int indent = 0;
2752 int leading_blank = 0;
2753 int trailing_blank = 0;
2754
2755 if (!STRING_INIT(parser, string, INITIAL_STRING_SIZE)) goto error;
2756 if (!STRING_INIT(parser, leading_break, INITIAL_STRING_SIZE)) goto error;
2757 if (!STRING_INIT(parser, trailing_breaks, INITIAL_STRING_SIZE)) goto error;
2758
2759 /* Eat the indicator '|' or '>'. */
2760
2761 start_mark = parser->mark;
2762
2763 SKIP(parser);
2764
2765 /* Scan the additional block scalar indicators. */
2766
2767 if (!CACHE(parser, 1)) goto error;
2768
2769 /* Check for a chomping indicator. */
2770
2771 if (CHECK(parser->buffer, '+') || CHECK(parser->buffer, '-'))
2772 {
2773 /* Set the chomping method and eat the indicator. */
2774
2775 chomping = CHECK(parser->buffer, '+') ? +1 : -1;
2776
2777 SKIP(parser);
2778
2779 /* Check for an indentation indicator. */
2780
2781 if (!CACHE(parser, 1)) goto error;
2782
2783 if (IS_DIGIT(parser->buffer))
2784 {
2785 /* Check that the intendation is greater than 0. */
2786
2787 if (CHECK(parser->buffer, '0')) {
2788 yaml_parser_set_scanner_error(parser, "while scanning a block scalar",
2789 start_mark, "found an intendation indicator equal to 0");
2790 goto error;
2791 }
2792
2793 /* Get the intendation level and eat the indicator. */
2794
2795 increment = AS_DIGIT(parser->buffer);
2796
2797 SKIP(parser);
2798 }
2799 }
2800
2801 /* Do the same as above, but in the opposite order. */
2802
2803 else if (IS_DIGIT(parser->buffer))
2804 {
2805 if (CHECK(parser->buffer, '0')) {
2806 yaml_parser_set_scanner_error(parser, "while scanning a block scalar",
2807 start_mark, "found an intendation indicator equal to 0");
2808 goto error;
2809 }
2810
2811 increment = AS_DIGIT(parser->buffer);
2812
2813 SKIP(parser);
2814
2815 if (!CACHE(parser, 1)) goto error;
2816
2817 if (CHECK(parser->buffer, '+') || CHECK(parser->buffer, '-')) {
2818 chomping = CHECK(parser->buffer, '+') ? +1 : -1;
2819
2820 SKIP(parser);
2821 }
2822 }
2823
2824 /* Eat whitespaces and comments to the end of the line. */
2825
2826 if (!CACHE(parser, 1)) goto error;
2827
2828 while (IS_BLANK(parser->buffer)) {
2829 SKIP(parser);
2830 if (!CACHE(parser, 1)) goto error;
2831 }
2832
2833 if (CHECK(parser->buffer, '#')) {
2834 while (!IS_BREAKZ(parser->buffer)) {
2835 SKIP(parser);
2836 if (!CACHE(parser, 1)) goto error;
2837 }
2838 }
2839
2840 /* Check if we are at the end of the line. */
2841
2842 if (!IS_BREAKZ(parser->buffer)) {
2843 yaml_parser_set_scanner_error(parser, "while scanning a block scalar",
2844 start_mark, "did not find expected comment or line break");
2845 goto error;
2846 }
2847
2848 /* Eat a line break. */
2849
2850 if (IS_BREAK(parser->buffer)) {
2851 if (!CACHE(parser, 2)) goto error;
2852 SKIP_LINE(parser);
2853 }
2854
2855 end_mark = parser->mark;
2856
2857 /* Set the intendation level if it was specified. */
2858
2859 if (increment) {
2860 indent = parser->indent >= 0 ? parser->indent+increment : increment;
2861 }
2862
2863 /* Scan the leading line breaks and determine the indentation level if needed. */
2864
2865 if (!yaml_parser_scan_block_scalar_breaks(parser, &indent, &trailing_breaks,
2866 start_mark, &end_mark)) goto error;
2867
2868 /* Scan the block scalar content. */
2869
2870 if (!CACHE(parser, 1)) goto error;
2871
2872 while ((int)parser->mark.column == indent && !IS_Z(parser->buffer))
2873 {
2874 /*
2875 * We are at the beginning of a non-empty line.
2876 */
2877
2878 /* Is it a trailing whitespace? */
2879
2880 trailing_blank = IS_BLANK(parser->buffer);
2881
2882 /* Check if we need to fold the leading line break. */
2883
2884 if (!literal && (*leading_break.start == '\n')
2885 && !leading_blank && !trailing_blank)
2886 {
2887 /* Do we need to join the lines by space? */
2888
2889 if (*trailing_breaks.start == '\0') {
2890 if (!STRING_EXTEND(parser, string)) goto error;
2891 *(string.pointer ++) = ' ';
2892 }
2893
2894 CLEAR(parser, leading_break);
2895 }
2896 else {
2897 if (!JOIN(parser, string, leading_break)) goto error;
2898 CLEAR(parser, leading_break);
2899 }
2900
2901 /* Append the remaining line breaks. */
2902
2903 if (!JOIN(parser, string, trailing_breaks)) goto error;
2904 CLEAR(parser, trailing_breaks);
2905
2906 /* Is it a leading whitespace? */
2907
2908 leading_blank = IS_BLANK(parser->buffer);
2909
2910 /* Consume the current line. */
2911
2912 while (!IS_BREAKZ(parser->buffer)) {
2913 if (!READ(parser, string)) goto error;
2914 if (!CACHE(parser, 1)) goto error;
2915 }
2916
2917 /* Consume the line break. */
2918
2919 if (!CACHE(parser, 2)) goto error;
2920
2921 if (!READ_LINE(parser, leading_break)) goto error;
2922
2923 /* Eat the following intendation spaces and line breaks. */
2924
2925 if (!yaml_parser_scan_block_scalar_breaks(parser,
2926 &indent, &trailing_breaks, start_mark, &end_mark)) goto error;
2927 }
2928
2929 /* Chomp the tail. */
2930
2931 if (chomping != -1) {
2932 if (!JOIN(parser, string, leading_break)) goto error;
2933 }
2934 if (chomping == 1) {
2935 if (!JOIN(parser, string, trailing_breaks)) goto error;
2936 }
2937
2938 /* Create a token. */
2939
2940 SCALAR_TOKEN_INIT(*token, string.start, string.pointer-string.start,
2941 literal ? YAML_LITERAL_SCALAR_STYLE : YAML_FOLDED_SCALAR_STYLE,
2942 start_mark, end_mark);
2943
2944 STRING_DEL(parser, leading_break);
2945 STRING_DEL(parser, trailing_breaks);
2946
2947 return 1;
2948
2949 error:
2950 STRING_DEL(parser, string);
2951 STRING_DEL(parser, leading_break);
2952 STRING_DEL(parser, trailing_breaks);
2953
2954 return 0;
2955 }
2956
2957 /*
2958 * Scan intendation spaces and line breaks for a block scalar. Determine the
2959 * intendation level if needed.
2960 */
2961
2962 static int
2963 yaml_parser_scan_block_scalar_breaks(yaml_parser_t *parser,
2964 int *indent, yaml_string_t *breaks,
2965 yaml_mark_t start_mark, yaml_mark_t *end_mark)
2966 {
2967 int max_indent = 0;
2968
2969 *end_mark = parser->mark;
2970
2971 /* Eat the intendation spaces and line breaks. */
2972
2973 while (1)
2974 {
2975 /* Eat the intendation spaces. */
2976
2977 if (!CACHE(parser, 1)) return 0;
2978
2979 while ((!*indent || (int)parser->mark.column < *indent)
2980 && IS_SPACE(parser->buffer)) {
2981 SKIP(parser);
2982 if (!CACHE(parser, 1)) return 0;
2983 }
2984
2985 if ((int)parser->mark.column > max_indent)
2986 max_indent = (int)parser->mark.column;
2987
2988 /* Check for a tab character messing the intendation. */
2989
2990 if ((!*indent || (int)parser->mark.column < *indent)
2991 && IS_TAB(parser->buffer)) {
2992 return yaml_parser_set_scanner_error(parser, "while scanning a block scalar",
2993 start_mark, "found a tab character where an intendation space is expected");
2994 }
2995
2996 /* Have we found a non-empty line? */
2997
2998 if (!IS_BREAK(parser->buffer)) break;
2999
3000 /* Consume the line break. */
3001
3002 if (!CACHE(parser, 2)) return 0;
3003 if (!READ_LINE(parser, *breaks)) return 0;
3004 *end_mark = parser->mark;
3005 }
3006
3007 /* Determine the indentation level if needed. */
3008
3009 if (!*indent) {
3010 *indent = max_indent;
3011 if (*indent < parser->indent + 1)
3012 *indent = parser->indent + 1;
3013 if (*indent < 1)
3014 *indent = 1;
3015 }
3016
3017 return 1;
3018 }
3019
3020 /*
3021 * Scan a quoted scalar.
3022 */
3023
3024 static int
3025 yaml_parser_scan_flow_scalar(yaml_parser_t *parser, yaml_token_t *token,
3026 int single)
3027 {
3028 yaml_mark_t start_mark;
3029 yaml_mark_t end_mark;
3030 yaml_string_t string = NULL_STRING;
3031 yaml_string_t leading_break = NULL_STRING;
3032 yaml_string_t trailing_breaks = NULL_STRING;
3033 yaml_string_t whitespaces = NULL_STRING;
3034 int leading_blanks;
3035
3036 if (!STRING_INIT(parser, string, INITIAL_STRING_SIZE)) goto error;
3037 if (!STRING_INIT(parser, leading_break, INITIAL_STRING_SIZE)) goto error;
3038 if (!STRING_INIT(parser, trailing_breaks, INITIAL_STRING_SIZE)) goto error;
3039 if (!STRING_INIT(parser, whitespaces, INITIAL_STRING_SIZE)) goto error;
3040
3041 /* Eat the left quote. */
3042
3043 start_mark = parser->mark;
3044
3045 SKIP(parser);
3046
3047 /* Consume the content of the quoted scalar. */
3048
3049 while (1)
3050 {
3051 /* Check that there are no document indicators at the beginning of the line. */
3052
3053 if (!CACHE(parser, 4)) goto error;
3054
3055 if (parser->mark.column == 0 &&
3056 ((CHECK_AT(parser->buffer, '-', 0) &&
3057 CHECK_AT(parser->buffer, '-', 1) &&
3058 CHECK_AT(parser->buffer, '-', 2)) ||
3059 (CHECK_AT(parser->buffer, '.', 0) &&
3060 CHECK_AT(parser->buffer, '.', 1) &&
3061 CHECK_AT(parser->buffer, '.', 2))) &&
3062 IS_BLANKZ_AT(parser->buffer, 3))
3063 {
3064 yaml_parser_set_scanner_error(parser, "while scanning a quoted scalar",
3065 start_mark, "found unexpected document indicator");
3066 goto error;
3067 }
3068
3069 /* Check for EOF. */
3070
3071 if (IS_Z(parser->buffer)) {
3072 yaml_parser_set_scanner_error(parser, "while scanning a quoted scalar",
3073 start_mark, "found unexpected end of stream");
3074 goto error;
3075 }
3076
3077 /* Consume non-blank characters. */
3078
3079 if (!CACHE(parser, 2)) goto error;
3080
3081 leading_blanks = 0;
3082
3083 while (!IS_BLANKZ(parser->buffer))
3084 {
3085 /* Check for an escaped single quote. */
3086
3087 if (single && CHECK_AT(parser->buffer, '\'', 0)
3088 && CHECK_AT(parser->buffer, '\'', 1))
3089 {
3090 if (!STRING_EXTEND(parser, string)) goto error;
3091 *(string.pointer++) = '\'';
3092 SKIP(parser);
3093 SKIP(parser);
3094 }
3095
3096 /* Check for the right quote. */
3097
3098 else if (CHECK(parser->buffer, single ? '\'' : '"'))
3099 {
3100 break;
3101 }
3102
3103 /* Check for an escaped line break. */
3104
3105 else if (!single && CHECK(parser->buffer, '\\')
3106 && IS_BREAK_AT(parser->buffer, 1))
3107 {
3108 if (!CACHE(parser, 3)) goto error;
3109 SKIP(parser);
3110 SKIP_LINE(parser);
3111 leading_blanks = 1;
3112 break;
3113 }
3114
3115 /* Check for an escape sequence. */
3116
3117 else if (!single && CHECK(parser->buffer, '\\'))
3118 {
3119 size_t code_length = 0;
3120
3121 if (!STRING_EXTEND(parser, string)) goto error;
3122
3123 /* Check the escape character. */
3124
3125 switch (parser->buffer.pointer[1])
3126 {
3127 case '0':
3128 *(string.pointer++) = '\0';
3129 break;
3130
3131 case 'a':
3132 *(string.pointer++) = '\x07';
3133 break;
3134
3135 case 'b':
3136 *(string.pointer++) = '\x08';
3137 break;
3138
3139 case 't':
3140 case '\t':
3141 *(string.pointer++) = '\x09';
3142 break;
3143
3144 case 'n':
3145 *(string.pointer++) = '\x0A';
3146 break;
3147
3148 case 'v':
3149 *(string.pointer++) = '\x0B';
3150 break;
3151
3152 case 'f':
3153 *(string.pointer++) = '\x0C';
3154 break;
3155
3156 case 'r':
3157 *(string.pointer++) = '\x0D';
3158 break;
3159
3160 case 'e':
3161 *(string.pointer++) = '\x1B';
3162 break;
3163
3164 case ' ':
3165 *(string.pointer++) = '\x20';
3166 break;
3167
3168 case '"':
3169 *(string.pointer++) = '"';
3170 break;
3171
3172 case '\'':
3173 *(string.pointer++) = '\'';
3174 break;
3175
3176 case '\\':
3177 *(string.pointer++) = '\\';
3178 break;
3179
3180 case 'N': /* NEL (#x85) */
3181 *(string.pointer++) = '\xC2';
3182 *(string.pointer++) = '\x85';
3183 break;
3184
3185 case '_': /* #xA0 */
3186 *(string.pointer++) = '\xC2';
3187 *(string.pointer++) = '\xA0';
3188 break;
3189
3190 case 'L': /* LS (#x2028) */
3191 *(string.pointer++) = '\xE2';
3192 *(string.pointer++) = '\x80';
3193 *(string.pointer++) = '\xA8';
3194 break;
3195
3196 case 'P': /* PS (#x2029) */
3197 *(string.pointer++) = '\xE2';
3198 *(string.pointer++) = '\x80';
3199 *(string.pointer++) = '\xA9';
3200 break;
3201
3202 case 'x':
3203 code_length = 2;
3204 break;
3205
3206 case 'u':
3207 code_length = 4;
3208 break;
3209
3210 case 'U':
3211 code_length = 8;
3212 break;
3213
3214 default:
3215 yaml_parser_set_scanner_error(parser, "while parsing a quoted scalar",
3216 start_mark, "found unknown escape character");
3217 goto error;
3218 }
3219
3220 SKIP(parser);
3221 SKIP(parser);
3222
3223 /* Consume an arbitrary escape code. */
3224
3225 if (code_length)
3226 {
3227 unsigned int value = 0;
3228 size_t k;
3229
3230 /* Scan the character value. */
3231
3232 if (!CACHE(parser, code_length)) goto error;
3233
3234 for (k = 0; k < code_length; k ++) {
3235 if (!IS_HEX_AT(parser->buffer, k)) {
3236 yaml_parser_set_scanner_error(parser, "while parsing a quoted scalar",
3237 start_mark, "did not find expected hexdecimal number");
3238 goto error;
3239 }
3240 value = (value << 4) + AS_HEX_AT(parser->buffer, k);
3241 }
3242
3243 /* Check the value and write the character. */
3244
3245 if ((value >= 0xD800 && value <= 0xDFFF) || value > 0x10FFFF) {
3246 yaml_parser_set_scanner_error(parser, "while parsing a quoted scalar",
3247 start_mark, "found invalid Unicode character escape code");
3248 goto error;
3249 }
3250
3251 if (value <= 0x7F) {
3252 *(string.pointer++) = value;
3253 }
3254 else if (value <= 0x7FF) {
3255 *(string.pointer++) = 0xC0 + (value >> 6);
3256 *(string.pointer++) = 0x80 + (value & 0x3F);
3257 }
3258 else if (value <= 0xFFFF) {
3259 *(string.pointer++) = 0xE0 + (value >> 12);
3260 *(string.pointer++) = 0x80 + ((value >> 6) & 0x3F);
3261 *(string.pointer++) = 0x80 + (value & 0x3F);
3262 }
3263 else {
3264 *(string.pointer++) = 0xF0 + (value >> 18);
3265 *(string.pointer++) = 0x80 + ((value >> 12) & 0x3F);
3266 *(string.pointer++) = 0x80 + ((value >> 6) & 0x3F);
3267 *(string.pointer++) = 0x80 + (value & 0x3F);
3268 }
3269
3270 /* Advance the pointer. */
3271
3272 for (k = 0; k < code_length; k ++) {
3273 SKIP(parser);
3274 }
3275 }
3276 }
3277
3278 else
3279 {
3280 /* It is a non-escaped non-blank character. */
3281
3282 if (!READ(parser, string)) goto error;
3283 }
3284
3285 if (!CACHE(parser, 2)) goto error;
3286 }
3287
3288 /* Check if we are at the end of the scalar. */
3289
3290 if (CHECK(parser->buffer, single ? '\'' : '"'))
3291 break;
3292
3293 /* Consume blank characters. */
3294
3295 if (!CACHE(parser, 1)) goto error;
3296
3297 while (IS_BLANK(parser->buffer) || IS_BREAK(parser->buffer))
3298 {
3299 if (IS_BLANK(parser->buffer))
3300 {
3301 /* Consume a space or a tab character. */
3302
3303 if (!leading_blanks) {
3304 if (!READ(parser, whitespaces)) goto error;
3305 }
3306 else {
3307 SKIP(parser);
3308 }
3309 }
3310 else
3311 {
3312 if (!CACHE(parser, 2)) goto error;
3313
3314 /* Check if it is a first line break. */
3315
3316 if (!leading_blanks)
3317 {
3318 CLEAR(parser, whitespaces);
3319 if (!READ_LINE(parser, leading_break)) goto error;
3320 leading_blanks = 1;
3321 }
3322 else
3323 {
3324 if (!READ_LINE(parser, trailing_breaks)) goto error;
3325 }
3326 }
3327 if (!CACHE(parser, 1)) goto error;
3328 }
3329
3330 /* Join the whitespaces or fold line breaks. */
3331
3332 if (leading_blanks)
3333 {
3334 /* Do we need to fold line breaks? */
3335
3336 if (leading_break.start[0] == '\n') {
3337 if (trailing_breaks.start[0] == '\0') {
3338 if (!STRING_EXTEND(parser, string)) goto error;
3339 *(string.pointer++) = ' ';
3340 }
3341 else {
3342 if (!JOIN(parser, string, trailing_breaks)) goto error;
3343 CLEAR(parser, trailing_breaks);
3344 }
3345 CLEAR(parser, leading_break);
3346 }
3347 else {
3348 if (!JOIN(parser, string, leading_break)) goto error;
3349 if (!JOIN(parser, string, trailing_breaks)) goto error;
3350 CLEAR(parser, leading_break);
3351 CLEAR(parser, trailing_breaks);
3352 }
3353 }
3354 else
3355 {
3356 if (!JOIN(parser, string, whitespaces)) goto error;
3357 CLEAR(parser, whitespaces);
3358 }
3359 }
3360
3361 /* Eat the right quote. */
3362
3363 SKIP(parser);
3364
3365 end_mark = parser->mark;
3366
3367 /* Create a token. */
3368
3369 SCALAR_TOKEN_INIT(*token, string.start, string.pointer-string.start,
3370 single ? YAML_SINGLE_QUOTED_SCALAR_STYLE : YAML_DOUBLE_QUOTED_SCALAR_STYLE,
3371 start_mark, end_mark);
3372
3373 STRING_DEL(parser, leading_break);
3374 STRING_DEL(parser, trailing_breaks);
3375 STRING_DEL(parser, whitespaces);
3376
3377 return 1;
3378
3379 error:
3380 STRING_DEL(parser, string);
3381 STRING_DEL(parser, leading_break);
3382 STRING_DEL(parser, trailing_breaks);
3383 STRING_DEL(parser, whitespaces);
3384
3385 return 0;
3386 }
3387
3388 /*
3389 * Scan a plain scalar.
3390 */
3391
3392 static int
3393 yaml_parser_scan_plain_scalar(yaml_parser_t *parser, yaml_token_t *token)
3394 {
3395 yaml_mark_t start_mark;
3396 yaml_mark_t end_mark;
3397 yaml_string_t string = NULL_STRING;
3398 yaml_string_t leading_break = NULL_STRING;
3399 yaml_string_t trailing_breaks = NULL_STRING;
3400 yaml_string_t whitespaces = NULL_STRING;
3401 int leading_blanks = 0;
3402 int indent = parser->indent+1;
3403
3404 if (!STRING_INIT(parser, string, INITIAL_STRING_SIZE)) goto error;
3405 if (!STRING_INIT(parser, leading_break, INITIAL_STRING_SIZE)) goto error;
3406 if (!STRING_INIT(parser, trailing_breaks, INITIAL_STRING_SIZE)) goto error;
3407 if (!STRING_INIT(parser, whitespaces, INITIAL_STRING_SIZE)) goto error;
3408
3409 start_mark = end_mark = parser->mark;
3410
3411 /* Consume the content of the plain scalar. */
3412
3413 while (1)
3414 {
3415 /* Check for a document indicator. */
3416
3417 if (!CACHE(parser, 4)) goto error;
3418
3419 if (parser->mark.column == 0 &&
3420 ((CHECK_AT(parser->buffer, '-', 0) &&
3421 CHECK_AT(parser->buffer, '-', 1) &&
3422 CHECK_AT(parser->buffer, '-', 2)) ||
3423 (CHECK_AT(parser->buffer, '.', 0) &&
3424 CHECK_AT(parser->buffer, '.', 1) &&
3425 CHECK_AT(parser->buffer, '.', 2))) &&
3426 IS_BLANKZ_AT(parser->buffer, 3)) break;
3427
3428 /* Check for a comment. */
3429
3430 if (CHECK(parser->buffer, '#'))
3431 break;
3432
3433 /* Consume non-blank characters. */
3434
3435 while (!IS_BLANKZ(parser->buffer))
3436 {
3437 /* Check for 'x:x' in the flow context. TODO: Fix the test "spec-08-13". */
3438
3439 if (parser->flow_level
3440 && CHECK(parser->buffer, ':')
3441 && !IS_BLANKZ_AT(parser->buffer, 1)) {
3442 yaml_parser_set_scanner_error(parser, "while scanning a plain scalar",
3443 start_mark, "found unexpected ':'");
3444 goto error;
3445 }
3446
3447 /* Check for indicators that may end a plain scalar. */
3448
3449 if ((CHECK(parser->buffer, ':') && IS_BLANKZ_AT(parser->buffer, 1))
3450 || (parser->flow_level &&
3451 (CHECK(parser->buffer, ',') || CHECK(parser->buffer, ':')
3452 || CHECK(parser->buffer, '?') || CHECK(parser->buffer, '[')
3453 || CHECK(parser->buffer, ']') || CHECK(parser->buffer, '{')
3454 || CHECK(parser->buffer, '}'))))
3455 break;
3456
3457 /* Check if we need to join whitespaces and breaks. */
3458
3459 if (leading_blanks || whitespaces.start != whitespaces.pointer)
3460 {
3461 if (leading_blanks)
3462 {
3463 /* Do we need to fold line breaks? */
3464
3465 if (leading_break.start[0] == '\n') {
3466 if (trailing_breaks.start[0] == '\0') {
3467 if (!STRING_EXTEND(parser, string)) goto error;
3468 *(string.pointer++) = ' ';
3469 }
3470 else {
3471 if (!JOIN(parser, string, trailing_breaks)) goto error;
3472 CLEAR(parser, trailing_breaks);
3473 }
3474 CLEAR(parser, leading_break);
3475 }
3476 else {
3477 if (!JOIN(parser, string, leading_break)) goto error;
3478 if (!JOIN(parser, string, trailing_breaks)) goto error;
3479 CLEAR(parser, leading_break);
3480 CLEAR(parser, trailing_breaks);
3481 }
3482
3483 leading_blanks = 0;
3484 }
3485 else
3486 {
3487 if (!JOIN(parser, string, whitespaces)) goto error;
3488 CLEAR(parser, whitespaces);
3489 }
3490 }
3491
3492 /* Copy the character. */
3493
3494 if (!READ(parser, string)) goto error;
3495
3496 end_mark = parser->mark;
3497
3498 if (!CACHE(parser, 2)) goto error;
3499 }
3500
3501 /* Is it the end? */
3502
3503 if (!(IS_BLANK(parser->buffer) || IS_BREAK(parser->buffer)))
3504 break;
3505
3506 /* Consume blank characters. */
3507
3508 if (!CACHE(parser, 1)) goto error;
3509
3510 while (IS_BLANK(parser->buffer) || IS_BREAK(parser->buffer))
3511 {
3512 if (IS_BLANK(parser->buffer))
3513 {
3514 /* Check for tab character that abuse intendation. */
3515
3516 if (leading_blanks && (int)parser->mark.column < indent
3517 && IS_TAB(parser->buffer)) {
3518 yaml_parser_set_scanner_error(parser, "while scanning a plain scalar",
3519 start_mark, "found a tab character that violate intendation");
3520 goto error;
3521 }
3522
3523 /* Consume a space or a tab character. */
3524
3525 if (!leading_blanks) {
3526 if (!READ(parser, whitespaces)) goto error;
3527 }
3528 else {
3529 SKIP(parser);
3530 }
3531 }
3532 else
3533 {
3534 if (!CACHE(parser, 2)) goto error;
3535
3536 /* Check if it is a first line break. */
3537
3538 if (!leading_blanks)
3539 {
3540 CLEAR(parser, whitespaces);
3541 if (!READ_LINE(parser, leading_break)) goto error;
3542 leading_blanks = 1;
3543 }
3544 else
3545 {
3546 if (!READ_LINE(parser, trailing_breaks)) goto error;
3547 }
3548 }
3549 if (!CACHE(parser, 1)) goto error;
3550 }
3551
3552 /* Check intendation level. */
3553
3554 if (!parser->flow_level && (int)parser->mark.column < indent)
3555 break;
3556 }
3557
3558 /* Create a token. */
3559
3560 SCALAR_TOKEN_INIT(*token, string.start, string.pointer-string.start,
3561 YAML_PLAIN_SCALAR_STYLE, start_mark, end_mark);
3562
3563 /* Note that we change the 'simple_key_allowed' flag. */
3564
3565 if (leading_blanks) {
3566 parser->simple_key_allowed = 1;
3567 }
3568
3569 STRING_DEL(parser, leading_break);
3570 STRING_DEL(parser, trailing_breaks);
3571 STRING_DEL(parser, whitespaces);
3572
3573 return 1;
3574
3575 error:
3576 STRING_DEL(parser, string);
3577 STRING_DEL(parser, leading_break);
3578 STRING_DEL(parser, trailing_breaks);
3579 STRING_DEL(parser, whitespaces);
3580
3581 return 0;
3582 }
3583
YAML_DOUBLE_QUOTED_SCALAR_STYLE
The double-quoted scalar style.
Definition: yaml.h:174
PUSH
#define PUSH(x)
Definition: bigdecimal.c:74
YAML_BLOCK_SEQUENCE_START_TOKEN
A BLOCK-SEQUENCE-START token.
Definition: yaml.h:232
yaml_mark_s
The pointer position.
Definition: yaml.h:145
yaml_parser_scan_directive
static int yaml_parser_scan_directive(yaml_parser_t *parser, yaml_token_t *token)
Definition: scanner.c:2004
yaml_parser_fetch_directive
static int yaml_parser_fetch_directive(yaml_parser_t *parser)
Definition: scanner.c:1376
strlen
size_t strlen(const char *)
yaml_parser_s::tail
yaml_token_t * tail
The tail of the tokens queue.
Definition: yaml.h:1200
minor
int minor
Definition: tcltklib.c:111
YAML_FLOW_SEQUENCE_START_TOKEN
A FLOW-SEQUENCE-START token.
Definition: yaml.h:239
NULL_STRING
#define NULL_STRING
Definition: yaml_private.h:126
YAML_VALUE_TOKEN
A VALUE token.
Definition: yaml.h:254
IS_BOM
#define IS_BOM(string)
Definition: yaml_private.h:301
yaml_parser_scan_flow_scalar
static int yaml_parser_scan_flow_scalar(yaml_parser_t *parser, yaml_token_t *token, int single)
Definition: scanner.c:3025
YAML_MEMORY_ERROR
Cannot allocate or reallocate a block of memory.
Definition: yaml.h:127
yaml_parser_scan_tag
static int yaml_parser_scan_tag(yaml_parser_t *parser, yaml_token_t *token)
Definition: scanner.c:2395
ALIAS_TOKEN_INIT
#define ALIAS_TOKEN_INIT(token, token_value, start_mark, end_mark)
Definition: yaml_private.h:516
yaml_parser_fetch_stream_start
static int yaml_parser_fetch_stream_start(yaml_parser_t *parser)
Definition: scanner.c:1300
YAML_BLOCK_END_TOKEN
A BLOCK-END token.
Definition: yaml.h:236
yaml_string_extend
yaml_string_extend(yaml_char_t **start, yaml_char_t **pointer, yaml_char_t **end)
Definition: api.c:74
AS_DIGIT
#define AS_DIGIT(string)
Definition: yaml_private.h:220
yaml_parser_s::stream_start_produced
int stream_start_produced
Have we started to scan the input stream?
Definition: yaml.h:1183
yaml_parser_fetch_block_scalar
static int yaml_parser_fetch_block_scalar(yaml_parser_t *parser, int literal)
Definition: scanner.c:1835
yaml_parser_fetch_block_entry
static int yaml_parser_fetch_block_entry(yaml_parser_t *parser)
Definition: scanner.c:1578
yaml_parser_s::encoding
yaml_encoding_t encoding
The input encoding.
Definition: yaml.h:1165
yaml_parser_s
The parser structure.
Definition: yaml.h:1081
YAML_BLOCK_MAPPING_START_TOKEN
A BLOCK-SEQUENCE-END token.
Definition: yaml.h:234
SKIP
#define SKIP(parser)
Definition: scanner.c:494
YAML_FLOW_ENTRY_TOKEN
A FLOW-ENTRY token.
Definition: yaml.h:250
yaml_parser_s::buffer
struct yaml_parser_s::@70 buffer
The working buffer.
READ
#define READ(parser, string)
Definition: scanner.c:518
yaml_parser_fetch_flow_collection_end
static int yaml_parser_fetch_flow_collection_end(yaml_parser_t *parser, yaml_token_type_t type)
Definition: scanner.c:1500
yaml_parser_scan_tag_directive_value
static int yaml_parser_scan_tag_directive_value(yaml_parser_t *parser, yaml_mark_t mark, yaml_char_t **handle, yaml_char_t **prefix)
Definition: scanner.c:2265
yaml_parser_scan_block_scalar
static int yaml_parser_scan_block_scalar(yaml_parser_t *parser, yaml_token_t *token, int literal)
Definition: scanner.c:2741
yaml_char_t
unsigned char yaml_char_t
The character type (UTF-8 octet).
Definition: yaml.h:78
yaml_parser_s::start
const unsigned char * start
The string start pointer.
Definition: yaml.h:1123
yaml_parser_s::context
const char * context
The error context.
Definition: yaml.h:1099
yaml_simple_key_s::mark
yaml_mark_t mark
The position mark.
Definition: yaml.h:1004
IS_BREAK_AT
#define IS_BREAK_AT(string, offset)
Definition: yaml_private.h:332
yaml_string_t::pointer
yaml_char_t * pointer
Definition: yaml_private.h:114
yaml_parser_fetch_flow_scalar
static int yaml_parser_fetch_flow_scalar(yaml_parser_t *parser, int single)
Definition: scanner.c:1866
READ_LINE
#define READ_LINE(parser, string)
Definition: scanner.c:530
yaml_parser_s::indent
int indent
The current indentation level.
Definition: yaml.h:1220
IS_BLANK
#define IS_BLANK(string)
Definition: yaml_private.h:326
yaml_parser_scan_version_directive_value
static int yaml_parser_scan_version_directive_value(yaml_parser_t *parser, yaml_mark_t start_mark, int *major, int *minor)
Definition: scanner.c:2171
TAG_DIRECTIVE_TOKEN_INIT
#define TAG_DIRECTIVE_TOKEN_INIT(token, token_handle, token_prefix, start_mark, end_mark)
Definition: yaml_private.h:540
yaml_parser_fetch_flow_collection_start
static int yaml_parser_fetch_flow_collection_start(yaml_parser_t *parser, yaml_token_type_t type)
Definition: scanner.c:1457
yaml_parser_s::pointer
yaml_char_t * pointer
The current position of the buffer.
Definition: yaml.h:1144
YAML_ALIAS_TOKEN
An ALIAS token.
Definition: yaml.h:257
yaml_parser_s::mark
yaml_mark_t mark
The mark of the current position.
Definition: yaml.h:1171
head
#define head
Definition: st.c:107
IS_HEX_AT
#define IS_HEX_AT(string, offset)
Definition: yaml_private.h:226
yaml_string_t::start
yaml_char_t * start
Definition: yaml_private.h:112
yaml_parser_remove_simple_key
static int yaml_parser_remove_simple_key(yaml_parser_t *parser)
Definition: scanner.c:1141
DEQUEUE
#define DEQUEUE(context, queue)
Definition: yaml_private.h:484
YAML_FLOW_SEQUENCE_END_TOKEN
A FLOW-SEQUENCE-END token.
Definition: yaml.h:241
INITIAL_STRING_SIZE
#define INITIAL_STRING_SIZE
Definition: yaml_private.h:89
STRING_DEL
#define STRING_DEL(context, string)
Definition: yaml_private.h:144
IS_SPACE
#define IS_SPACE(string)
Definition: yaml_private.h:309
yaml_free
yaml_free(void *ptr)
Definition: api.c:51
YAML_FOLDED_SCALAR_STYLE
The folded scalar style.
Definition: yaml.h:179
AS_HEX_AT
#define AS_HEX_AT(string, offset)
Definition: yaml_private.h:240
yaml_parser_s::top
int * top
The top of the stack.
Definition: yaml.h:1216
QUEUE_INSERT
#define QUEUE_INSERT(context, queue, index, value)
Definition: yaml_private.h:487
yaml_parser_fetch_next_token
static int yaml_parser_fetch_next_token(yaml_parser_t *parser)
Definition: scanner.c:860
yaml_simple_key_s::required
int required
Is a simple key required?
Definition: yaml.h:998
yaml_parser_s::simple_key_allowed
int simple_key_allowed
May a simple key occur at the current position?
Definition: yaml.h:1223
CACHE
#define CACHE(parser, length)
Definition: scanner.c:485
IS_TAB
#define IS_TAB(string)
Definition: yaml_private.h:317
yaml_parser_fetch_document_indicator
static int yaml_parser_fetch_document_indicator(yaml_parser_t *parser, yaml_token_type_t type)
Definition: scanner.c:1412
yaml_parser_scan_uri_escapes
static int yaml_parser_scan_uri_escapes(yaml_parser_t *parser, int directive, yaml_mark_t start_mark, yaml_string_t *string)
Definition: scanner.c:2672
yaml_parser_unroll_indent
static int yaml_parser_unroll_indent(yaml_parser_t *parser, ptrdiff_t column)
Definition: scanner.c:1267
yaml_parser_s::tokens
struct yaml_parser_s::@72 tokens
The tokens queue.
yaml_parser_fetch_stream_end
static int yaml_parser_fetch_stream_end(yaml_parser_t *parser)
Definition: scanner.c:1338
yaml_parser_set_scanner_error
static int yaml_parser_set_scanner_error(yaml_parser_t *parser, const char *context, yaml_mark_t context_mark, const char *problem)
Definition: scanner.c:782
IS_BREAKZ
#define IS_BREAKZ(string)
Definition: yaml_private.h:358
CHECK
#define CHECK(string, octet)
Definition: yaml_private.h:184
IS_ALPHA
#define IS_ALPHA(string)
Definition: yaml_private.h:201
yaml_parser_scan_block_scalar_breaks
static int yaml_parser_scan_block_scalar_breaks(yaml_parser_t *parser, int *indent, yaml_string_t *breaks, yaml_mark_t start_mark, yaml_mark_t *end_mark)
Definition: scanner.c:2963
yaml_token_delete
yaml_token_delete(yaml_token_t *token)
Free any memory allocated for a token object.
Definition: api.c:578
TOKEN_INIT
#define TOKEN_INIT(token, token_type, token_start_mark, token_end_mark)
Definition: yaml_private.h:503
if
if((ID)(DISPID) nameid!=nameid)
Definition: win32ole.c:770
yaml_parser_fetch_tag
static int yaml_parser_fetch_tag(yaml_parser_t *parser)
Definition: scanner.c:1804
YAML_DECLARE
#define YAML_DECLARE(type)
The public API declaration.
Definition: yaml.h:38
token
ID token
Definition: ripper.c:16685
YAML_FLOW_MAPPING_START_TOKEN
A FLOW-MAPPING-START token.
Definition: yaml.h:243
yaml_parser_s::simple_keys
struct yaml_parser_s::@74 simple_keys
The stack of simple keys.
yaml_parser_decrease_flow_level
static int yaml_parser_decrease_flow_level(yaml_parser_t *parser)
Definition: scanner.c:1194
TAG_TOKEN_INIT
#define TAG_TOKEN_INIT(token, token_handle, token_suffix, start_mark, end_mark)
Definition: yaml_private.h:524
IS_BLANK_AT
#define IS_BLANK_AT(string, offset)
Definition: yaml_private.h:323
yaml_parser_s::error
yaml_error_type_t error
Error type.
Definition: yaml.h:1089
IS_DIGIT
#define IS_DIGIT(string)
Definition: yaml_private.h:211
yaml_parser_scan_tag_handle
static int yaml_parser_scan_tag_handle(yaml_parser_t *parser, int directive, yaml_mark_t start_mark, yaml_char_t **handle)
Definition: scanner.c:2510
STREAM_START_TOKEN_INIT
#define STREAM_START_TOKEN_INIT(token, token_encoding, start_mark, end_mark)
Definition: yaml_private.h:509
yaml_parser_fetch_value
static int yaml_parser_fetch_value(yaml_parser_t *parser)
Definition: scanner.c:1692
CHECK_AT
#define CHECK_AT(string, octet, offset)
Definition: yaml_private.h:177
const
#define const
Definition: strftime.c:102
yaml_simple_key_s::token_number
size_t token_number
The number of the token.
Definition: yaml.h:1001
yaml_parser_fetch_flow_entry
static int yaml_parser_fetch_flow_entry(yaml_parser_t *parser)
Definition: scanner.c:1543
yaml_parser_scan_plain_scalar
static int yaml_parser_scan_plain_scalar(yaml_parser_t *parser, yaml_token_t *token)
Definition: scanner.c:3393
yaml_parser_increase_flow_level
static int yaml_parser_increase_flow_level(yaml_parser_t *parser)
Definition: scanner.c:1168
type
int type
Definition: tcltklib.c:112
YAML_STREAM_END_TOKEN
A STREAM-END token.
Definition: yaml.h:220
yaml_token_type_t
enum yaml_token_type_e yaml_token_type_t
Token types.
yaml_parser_s::head
yaml_token_t * head
The head of the tokens queue.
Definition: yaml.h:1198
ENQUEUE
#define ENQUEUE(context, queue, value)
Definition: yaml_private.h:475
YAML_ANCHOR_TOKEN
An ANCHOR token.
Definition: yaml.h:259
yaml_string_t
Definition: yaml_private.h:111
JOIN
#define JOIN(context, string_a, string_b)
Definition: yaml_private.h:160
ANCHOR_TOKEN_INIT
#define ANCHOR_TOKEN_INIT(token, token_value, start_mark, end_mark)
Definition: yaml_private.h:520
SCALAR_TOKEN_INIT
#define SCALAR_TOKEN_INIT(token, token_value, token_length, token_style, start_mark, end_mark)
Definition: yaml_private.h:529
yaml_parser_s::context_mark
yaml_mark_t context_mark
The context position.
Definition: yaml.h:1101
yaml_parser_fetch_anchor
static int yaml_parser_fetch_anchor(yaml_parser_t *parser, yaml_token_type_t type)
Definition: scanner.c:1774
YAML_FLOW_MAPPING_END_TOKEN
A FLOW-MAPPING-END token.
Definition: yaml.h:245
yaml_parser_s::problem_mark
yaml_mark_t problem_mark
The problem position.
Definition: yaml.h:1097
yaml_parser_s::tokens_parsed
size_t tokens_parsed
The number of tokens fetched from the queue.
Definition: yaml.h:1204
yaml_parser_save_simple_key
static int yaml_parser_save_simple_key(yaml_parser_t *parser)
Definition: scanner.c:1097
STRING_EXTEND
#define STRING_EXTEND(context, string)
Definition: yaml_private.h:148
IS_BLANKZ_AT
#define IS_BLANKZ_AT(string, offset)
Definition: yaml_private.h:373
YAML_DOCUMENT_START_TOKEN
A DOCUMENT-START token.
Definition: yaml.h:227
yaml_parser_scan_to_next_token
static int yaml_parser_scan_to_next_token(yaml_parser_t *parser)
Definition: scanner.c:1928
STRING_INIT
#define STRING_INIT(context, string, size)
Definition: yaml_private.h:135
STREAM_END_TOKEN_INIT
#define STREAM_END_TOKEN_INIT(token, start_mark, end_mark)
Definition: yaml_private.h:513
yaml_parser_scan_tag_uri
static int yaml_parser_scan_tag_uri(yaml_parser_t *parser, int directive, yaml_char_t *head, yaml_mark_t start_mark, yaml_char_t **uri)
Definition: scanner.c:2577
yaml_simple_key_s
This structure holds information about a potential simple key.
Definition: yaml.h:993
MAX_NUMBER_LENGTH
#define MAX_NUMBER_LENGTH
Definition: scanner.c:2205
YAML_PLAIN_SCALAR_STYLE
The plain scalar style.
Definition: yaml.h:169
YAML_LITERAL_SCALAR_STYLE
The literal scalar style.
Definition: yaml.h:177
yaml_parser_scan_anchor
static int yaml_parser_scan_anchor(yaml_parser_t *parser, yaml_token_t *token, yaml_token_type_t type)
Definition: scanner.c:2329
yaml_mark_s::line
size_t line
The position line.
Definition: yaml.h:150
POP
#define POP(context, stack)
Definition: yaml_private.h:457
YAML_DOCUMENT_END_TOKEN
A DOCUMENT-END token.
Definition: yaml.h:229
IS_Z
#define IS_Z(string)
Definition: yaml_private.h:290
mark
static VALUE mark(VALUE self)
Definition: psych_parser.c:523
yaml_parser_stale_simple_keys
static int yaml_parser_stale_simple_keys(yaml_parser_t *parser)
Definition: scanner.c:1056
YAML_SCANNER_ERROR
Cannot scan the input stream.
Definition: yaml.h:132
yaml_parser_fetch_key
static int yaml_parser_fetch_key(yaml_parser_t *parser)
Definition: scanner.c:1639
yaml_mark_s::index
size_t index
The position index.
Definition: yaml.h:147
yaml_parser_scan_version_directive_number
static int yaml_parser_scan_version_directive_number(yaml_parser_t *parser, yaml_mark_t start_mark, int *number)
Definition: scanner.c:2218
IS_BLANKZ
#define IS_BLANKZ(string)
Definition: yaml_private.h:376
yaml_parser_scan
yaml_parser_scan(yaml_parser_t *parser, yaml_token_t *token)
Scan the input stream and produce the next token.
Definition: scanner.c:742
yaml_parser_s::indents
struct yaml_parser_s::@73 indents
The indentation levels stack.
assert
#define assert(condition)
Definition: ossl.h:45
name
const char * name
Definition: nkf.c:208
yaml_malloc
yaml_malloc(size_t size)
Definition: api.c:31
yaml_parser_s::problem
const char * problem
Error description.
Definition: yaml.h:1091
yaml_simple_key_s::possible
int possible
Is a simple key possible?
Definition: yaml.h:995
YAML_BLOCK_ENTRY_TOKEN
A BLOCK-ENTRY token.
Definition: yaml.h:248
yaml_parser_fetch_more_tokens
yaml_parser_fetch_more_tokens(yaml_parser_t *parser)
Definition: scanner.c:800
major
int major
Definition: tcltklib.c:110
yaml_private.h
yaml_parser_scan_directive_name
static int yaml_parser_scan_directive_name(yaml_parser_t *parser, yaml_mark_t start_mark, yaml_char_t **name)
Definition: scanner.c:2120
VERSION_DIRECTIVE_TOKEN_INIT
#define VERSION_DIRECTIVE_TOKEN_INIT(token, token_major, token_minor, start_mark, end_mark)
Definition: yaml_private.h:535
IS_BREAK
#define IS_BREAK(string)
Definition: yaml_private.h:344
yaml_mark_s::column
size_t column
The position column.
Definition: yaml.h:153
NULL
#define NULL
Definition: _sdbm.c:103
YAML_KEY_TOKEN
A KEY token.
Definition: yaml.h:252
yaml_parser_s::flow_level
int flow_level
The number of unclosed '[' and '{' indicators.
Definition: yaml.h:1189
yaml_parser_roll_indent
static int yaml_parser_roll_indent(yaml_parser_t *parser, ptrdiff_t column, ptrdiff_t number, yaml_token_type_t type, yaml_mark_t mark)
Definition: scanner.c:1212
SKIP_LINE
#define SKIP_LINE(parser)
Definition: scanner.c:500
yaml_token_s
The token structure.
Definition: yaml.h:267
CLEAR
#define CLEAR(context, string)
Definition: yaml_private.h:156
yaml_parser_fetch_plain_scalar
static int yaml_parser_fetch_plain_scalar(yaml_parser_t *parser)
Definition: scanner.c:1897
YAML_SINGLE_QUOTED_SCALAR_STYLE
The single-quoted scalar style.
Definition: yaml.h:172