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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 | #if HAVE_CONFIG_H | |
479 | #include <config.h> | |
480 | #endif | |
481 | ||
5eff53a4 | 482 | #include <yaml.h> |
03be97ab KS |
483 | |
484 | #include <assert.h> | |
485 | ||
f2b59d4d KS |
486 | /* |
487 | * Ensure that the buffer contains the required number of characters. | |
488 | * Return 1 on success, 0 on failure (reader error or memory error). | |
489 | */ | |
490 | ||
491 | #define UPDATE(parser,length) \ | |
492 | (parser->unread >= (length) \ | |
493 | ? 1 \ | |
494 | : yaml_parser_update_buffer(parser, (length))) | |
495 | ||
496 | /* | |
497 | * Check the octet at the specified position. | |
498 | */ | |
499 | ||
500 | #define CHECK_AT(parser,octet,offset) \ | |
eb9cceb5 | 501 | (parser->pointer[offset] == (yaml_char_t)(octet)) |
f2b59d4d KS |
502 | |
503 | /* | |
504 | * Check the current octet in the buffer. | |
505 | */ | |
506 | ||
507 | #define CHECK(parser,octet) CHECK_AT(parser,(octet),0) | |
508 | ||
e71095e3 KS |
509 | /* |
510 | * Check if the character at the specified position is an alphabetical | |
511 | * character, a digit, '_', or '-'. | |
512 | */ | |
513 | ||
514 | #define IS_ALPHA_AT(parser,offset) \ | |
515 | ((parser->pointer[offset] >= (yaml_char_t) '0' && \ | |
516 | parser->pointer[offset] <= (yaml_char_t) '9') || \ | |
517 | (parser->pointer[offset] >= (yaml_char_t) 'A' && \ | |
518 | parser->pointer[offset] <= (yaml_char_t) 'Z') || \ | |
519 | (parser->pointer[offset] >= (yaml_char_t) 'a' && \ | |
520 | parser->pointer[offset] <= (yaml_char_t) 'z') || \ | |
521 | parser->pointer[offset] == '_' || \ | |
522 | parser->pointer[offset] == '-') | |
523 | ||
524 | #define IS_ALPHA(parser) IS_ALPHA_AT(parser,0) | |
525 | ||
526 | /* | |
527 | * Check if the character at the specified position is a digit. | |
528 | */ | |
529 | ||
530 | #define IS_DIGIT_AT(parser,offset) \ | |
531 | ((parser->pointer[offset] >= (yaml_char_t) '0' && \ | |
532 | parser->pointer[offset] <= (yaml_char_t) '9')) | |
533 | ||
534 | #define IS_DIGIT(parser) IS_DIGIT_AT(parser,0) | |
535 | ||
536 | /* | |
537 | * Get the value of a digit. | |
538 | */ | |
539 | ||
540 | #define AS_DIGIT_AT(parser,offset) \ | |
541 | (parser->pointer[offset] - (yaml_char_t) '0') | |
542 | ||
543 | #define AS_DIGIT(parser) AS_DIGIT_AT(parser,0) | |
544 | ||
545 | /* | |
546 | * Check if the character at the specified position is a hex-digit. | |
547 | */ | |
548 | ||
549 | #define IS_HEX_AT(parser,offset) \ | |
550 | ((parser->pointer[offset] >= (yaml_char_t) '0' && \ | |
551 | parser->pointer[offset] <= (yaml_char_t) '9') || \ | |
552 | (parser->pointer[offset] >= (yaml_char_t) 'A' && \ | |
553 | parser->pointer[offset] <= (yaml_char_t) 'F') || \ | |
554 | (parser->pointer[offset] >= (yaml_char_t) 'a' && \ | |
555 | parser->pointer[offset] <= (yaml_char_t) 'f')) | |
556 | ||
557 | #define IS_HEX(parser) IS_HEX_AT(parser,0) | |
558 | ||
559 | /* | |
560 | * Get the value of a hex-digit. | |
561 | */ | |
562 | ||
563 | #define AS_HEX_AT(parser,offset) \ | |
564 | ((parser->pointer[offset] >= (yaml_char_t) 'A' && \ | |
565 | parser->pointer[offset] <= (yaml_char_t) 'F') ? \ | |
566 | (parser->pointer[offset] - (yaml_char_t) 'A' + 10) : \ | |
567 | (parser->pointer[offset] >= (yaml_char_t) 'a' && \ | |
568 | parser->pointer[offset] <= (yaml_char_t) 'f') ? \ | |
569 | (parser->pointer[offset] - (yaml_char_t) 'a' + 10) : \ | |
570 | (parser->pointer[offset] - (yaml_char_t) '0')) | |
571 | ||
572 | #define AS_HEX(parser) AS_HEX_AT(parser,0) | |
573 | ||
f2b59d4d KS |
574 | /* |
575 | * Check if the character at the specified position is NUL. | |
576 | */ | |
577 | ||
578 | #define IS_Z_AT(parser,offset) CHECK_AT(parser,'\0',(offset)) | |
579 | ||
580 | #define IS_Z(parser) IS_Z_AT(parser,0) | |
581 | ||
e71095e3 KS |
582 | /* |
583 | * Check if the character at the specified position is BOM. | |
584 | */ | |
585 | ||
586 | #define IS_BOM_AT(parser,offset) \ | |
587 | (CHECK_AT(parser,'\xEF',(offset)) \ | |
588 | && CHECK_AT(parser,'\xBB',(offset)+1) \ | |
589 | && CHECK_AT(parser,'\xBF',(offset)+1)) /* BOM (#xFEFF) */ | |
590 | ||
591 | #define IS_BOM(parser) IS_BOM_AT(parser,0) | |
592 | ||
f2b59d4d KS |
593 | /* |
594 | * Check if the character at the specified position is space. | |
595 | */ | |
596 | ||
597 | #define IS_SPACE_AT(parser,offset) CHECK_AT(parser,' ',(offset)) | |
598 | ||
599 | #define IS_SPACE(parser) IS_SPACE_AT(parser,0) | |
600 | ||
601 | /* | |
602 | * Check if the character at the specified position is tab. | |
603 | */ | |
604 | ||
605 | #define IS_TAB_AT(parser,offset) CHECK_AT(parser,'\t',(offset)) | |
606 | ||
607 | #define IS_TAB(parser) IS_TAB_AT(parser,0) | |
608 | ||
609 | /* | |
610 | * Check if the character at the specified position is blank (space or tab). | |
611 | */ | |
612 | ||
613 | #define IS_BLANK_AT(parser,offset) \ | |
614 | (IS_SPACE_AT(parser,(offset)) || IS_TAB_AT(parser,(offset))) | |
615 | ||
616 | #define IS_BLANK(parser) IS_BLANK_AT(parser,0) | |
617 | ||
618 | /* | |
619 | * Check if the character at the specified position is a line break. | |
620 | */ | |
621 | ||
622 | #define IS_BREAK_AT(parser,offset) \ | |
623 | (CHECK_AT(parser,'\r',(offset)) /* CR (#xD)*/ \ | |
624 | || CHECK_AT(parser,'\n',(offset)) /* LF (#xA) */ \ | |
625 | || (CHECK_AT(parser,'\xC2',(offset)) \ | |
e71095e3 | 626 | && CHECK_AT(parser,'\x85',(offset)+1)) /* NEL (#x85) */ \ |
f2b59d4d | 627 | || (CHECK_AT(parser,'\xE2',(offset)) \ |
e71095e3 KS |
628 | && CHECK_AT(parser,'\x80',(offset)+1) \ |
629 | && CHECK_AT(parser,'\xA8',(offset)+2)) /* LS (#x2028) */ \ | |
f2b59d4d | 630 | || (CHECK_AT(parser,'\xE2',(offset)) \ |
e71095e3 | 631 | && CHECK_AT(parser,'\x80',(offset)+1) \ |
92d41fe1 | 632 | && CHECK_AT(parser,'\xA9',(offset)+2))) /* PS (#x2029) */ |
f2b59d4d KS |
633 | |
634 | #define IS_BREAK(parser) IS_BREAK_AT(parser,0) | |
635 | ||
eb9cceb5 KS |
636 | #define IS_CRLF_AT(parser,offset) \ |
637 | (CHECK_AT(parser,'\r',(offset)) && CHECK_AT(parser,'\n',(offset)+1)) | |
638 | ||
639 | #define IS_CRLF(parser) IS_CRLF_AT(parser,0) | |
640 | ||
f2b59d4d KS |
641 | /* |
642 | * Check if the character is a line break or NUL. | |
643 | */ | |
644 | ||
645 | #define IS_BREAKZ_AT(parser,offset) \ | |
646 | (IS_BREAK_AT(parser,(offset)) || IS_Z_AT(parser,(offset))) | |
647 | ||
648 | #define IS_BREAKZ(parser) IS_BREAKZ_AT(parser,0) | |
649 | ||
650 | /* | |
651 | * Check if the character is a line break, space, or NUL. | |
652 | */ | |
653 | ||
654 | #define IS_SPACEZ_AT(parser,offset) \ | |
655 | (IS_SPACE_AT(parser,(offset)) || IS_BREAKZ_AT(parser,(offset))) | |
656 | ||
657 | #define IS_SPACEZ(parser) IS_SPACEZ_AT(parser,0) | |
658 | ||
659 | /* | |
660 | * Check if the character is a line break, space, tab, or NUL. | |
661 | */ | |
662 | ||
663 | #define IS_BLANKZ_AT(parser,offset) \ | |
664 | (IS_BLANK_AT(parser,(offset)) || IS_BREAKZ_AT(parser,(offset))) | |
665 | ||
666 | #define IS_BLANKZ(parser) IS_BLANKZ_AT(parser,0) | |
667 | ||
eb9cceb5 KS |
668 | /* |
669 | * Determine the width of the character. | |
670 | */ | |
671 | ||
672 | #define WIDTH_AT(parser,offset) \ | |
673 | ((parser->pointer[(offset)] & 0x80) == 0x00 ? 1 : \ | |
674 | (parser->pointer[(offset)] & 0xE0) == 0xC0 ? 2 : \ | |
675 | (parser->pointer[(offset)] & 0xF0) == 0xE0 ? 3 : \ | |
676 | (parser->pointer[(offset)] & 0xF8) == 0xF0 ? 4 : 0) | |
677 | ||
678 | #define WIDTH(parser) WIDTH_AT(parser,0) | |
679 | ||
680 | /* | |
681 | * Advance the buffer pointer. | |
682 | */ | |
683 | ||
e71095e3 | 684 | #define FORWARD(parser) \ |
eb9cceb5 | 685 | (parser->index ++, \ |
e71095e3 | 686 | parser->column ++, \ |
eb9cceb5 KS |
687 | parser->unread --, \ |
688 | parser->pointer += WIDTH(parser)) | |
689 | ||
e71095e3 KS |
690 | #define FORWARD_LINE(parser) \ |
691 | (IS_CRLF(parser) ? \ | |
692 | (parser->index += 2, \ | |
693 | parser->column = 0, \ | |
92d41fe1 | 694 | parser->line ++, \ |
e71095e3 KS |
695 | parser->unread -= 2, \ |
696 | parser->pointer += 2) : \ | |
697 | IS_BREAK(parser) ? \ | |
698 | (parser->index ++, \ | |
699 | parser->column = 0, \ | |
92d41fe1 | 700 | parser->line ++, \ |
e71095e3 KS |
701 | parser->unread --, \ |
702 | parser->pointer += WIDTH(parser)) : 0) | |
703 | ||
704 | /* | |
705 | * Resize a string if needed. | |
706 | */ | |
707 | ||
708 | #define RESIZE(parser,string) \ | |
92d41fe1 KS |
709 | ((string).pointer-(string).buffer+5 < (string).size ? 1 : \ |
710 | yaml_parser_resize_string(parser, &(string))) | |
e71095e3 KS |
711 | |
712 | /* | |
713 | * Copy a character to a string buffer and advance pointers. | |
714 | */ | |
715 | ||
716 | #define COPY(parser,string) \ | |
717 | (((*parser->pointer & 0x80) == 0x00 ? \ | |
92d41fe1 | 718 | (*((string).pointer++) = *(parser->pointer++)) : \ |
e71095e3 | 719 | (*parser->pointer & 0xE0) == 0xC0 ? \ |
92d41fe1 KS |
720 | (*((string).pointer++) = *(parser->pointer++), \ |
721 | *((string).pointer++) = *(parser->pointer++)) : \ | |
e71095e3 | 722 | (*parser->pointer & 0xF0) == 0xE0 ? \ |
92d41fe1 KS |
723 | (*((string).pointer++) = *(parser->pointer++), \ |
724 | *((string).pointer++) = *(parser->pointer++), \ | |
725 | *((string).pointer++) = *(parser->pointer++)) : \ | |
e71095e3 | 726 | (*parser->pointer & 0xF8) == 0xF0 ? \ |
92d41fe1 KS |
727 | (*((string).pointer++) = *(parser->pointer++), \ |
728 | *((string).pointer++) = *(parser->pointer++), \ | |
729 | *((string).pointer++) = *(parser->pointer++), \ | |
730 | *((string).pointer++) = *(parser->pointer++)) : 0), \ | |
e71095e3 KS |
731 | parser->index ++, \ |
732 | parser->column ++, \ | |
733 | parser->unread --) | |
92d41fe1 KS |
734 | |
735 | /* | |
736 | * Copy a line break character to a string buffer and advance pointers. | |
737 | */ | |
738 | ||
739 | #define COPY_LINE(parser,string) \ | |
740 | ((CHECK_AT(parser,'\r',0) && CHECK_AT(parser,'\n',1)) ? /* CR LF -> LF */ \ | |
741 | (*((string).pointer++) = (yaml_char_t) '\n', \ | |
742 | parser->pointer += 2, \ | |
743 | parser->index += 2, \ | |
744 | parser->column = 0, \ | |
745 | parser->line ++, \ | |
746 | parser->unread -= 2) : \ | |
747 | (CHECK_AT(parser,'\r',0) || CHECK_AT(parser,'\n',0)) ? /* CR|LF -> LF */ \ | |
748 | (*((string).pointer++) = (yaml_char_t) '\n', \ | |
749 | parser->pointer ++, \ | |
750 | parser->index ++, \ | |
751 | parser->column = 0, \ | |
752 | parser->line ++, \ | |
753 | parser->unread --) : \ | |
754 | (CHECK_AT(parser,'\xC2',0) && CHECK_AT(parser,'\x85',1)) ? /* NEL -> LF */ \ | |
755 | (*((string).pointer++) = (yaml_char_t) '\n', \ | |
756 | parser->pointer += 2, \ | |
757 | parser->index ++, \ | |
758 | parser->column = 0, \ | |
759 | parser->line ++, \ | |
760 | parser->unread --) : \ | |
761 | (CHECK_AT(parser,'\xE2',0) && \ | |
762 | CHECK_AT(parser,'\x80',1) && \ | |
763 | (CHECK_AT(parser,'\xA8',2) || \ | |
764 | CHECK_AT(parser,'\xA9',2))) ? /* LS|PS -> LS|PS */ \ | |
765 | (*((string).pointer++) = *(parser->pointer++), \ | |
766 | *((string).pointer++) = *(parser->pointer++), \ | |
767 | *((string).pointer++) = *(parser->pointer++), \ | |
768 | parser->index ++, \ | |
769 | parser->column = 0, \ | |
770 | parser->line ++, \ | |
771 | parser->unread --) : 0) | |
772 | ||
773 | /* | |
774 | * Append a string to another string and clear the former string. | |
775 | */ | |
776 | ||
777 | #define JOIN(parser,head_string,tail_string) \ | |
778 | (yaml_parser_join_string(parser, &(head_string), &(tail_string)) && \ | |
779 | yaml_parser_clear_string(parser, &(tail_string))) | |
e71095e3 | 780 | |
03be97ab KS |
781 | /* |
782 | * Public API declarations. | |
783 | */ | |
784 | ||
785 | YAML_DECLARE(yaml_token_t *) | |
786 | yaml_parser_get_token(yaml_parser_t *parser); | |
787 | ||
788 | YAML_DECLARE(yaml_token_t *) | |
789 | yaml_parser_peek_token(yaml_parser_t *parser); | |
790 | ||
f2b59d4d KS |
791 | /* |
792 | * Error handling. | |
793 | */ | |
794 | ||
795 | static int | |
796 | yaml_parser_set_scanner_error(yaml_parser_t *parser, const char *context, | |
797 | yaml_mark_t context_mark, const char *problem); | |
798 | ||
799 | static yaml_mark_t | |
800 | yaml_parser_get_mark(yaml_parser_t *parser); | |
801 | ||
e71095e3 KS |
802 | /* |
803 | * Buffers and lists. | |
804 | */ | |
805 | ||
806 | typedef struct { | |
807 | yaml_char_t *buffer; | |
808 | yaml_char_t *pointer; | |
809 | size_t size; | |
810 | } yaml_string_t; | |
811 | ||
812 | static yaml_string_t | |
813 | yaml_parser_new_string(yaml_parser_t *parser); | |
814 | ||
815 | static int | |
816 | yaml_parser_resize_string(yaml_parser_t *parser, yaml_string_t *string); | |
817 | ||
92d41fe1 KS |
818 | static int |
819 | yaml_parser_join_string(yaml_parser_t *parser, | |
820 | yaml_string_t *string1, yaml_string_t *string2); | |
821 | ||
822 | static int | |
823 | yaml_parser_clear_string(yaml_parser_t *parser, yaml_string_t *string); | |
824 | ||
e71095e3 KS |
825 | static int |
826 | yaml_parser_resize_list(yaml_parser_t *parser, void **buffer, size_t *size, | |
827 | size_t item_size); | |
828 | ||
03be97ab KS |
829 | /* |
830 | * High-level token API. | |
831 | */ | |
832 | ||
833 | static int | |
834 | yaml_parser_fetch_more_tokens(yaml_parser_t *parser); | |
835 | ||
836 | static int | |
837 | yaml_parser_fetch_next_token(yaml_parser_t *parser); | |
838 | ||
839 | /* | |
840 | * Potential simple keys. | |
841 | */ | |
842 | ||
843 | static int | |
844 | yaml_parser_stale_simple_keys(yaml_parser_t *parser); | |
845 | ||
846 | static int | |
847 | yaml_parser_save_simple_key(yaml_parser_t *parser); | |
848 | ||
849 | static int | |
850 | yaml_parser_remove_simple_key(yaml_parser_t *parser); | |
851 | ||
eb9cceb5 KS |
852 | static int |
853 | yaml_parser_increase_flow_level(yaml_parser_t *parser); | |
854 | ||
855 | static int | |
856 | yaml_parser_decrease_flow_level(yaml_parser_t *parser); | |
857 | ||
858 | /* | |
859 | * Token manipulation. | |
860 | */ | |
861 | ||
862 | static int | |
863 | yaml_parser_append_token(yaml_parser_t *parser, yaml_token_t *token); | |
864 | ||
865 | static int | |
866 | yaml_parser_insert_token(yaml_parser_t *parser, | |
867 | int number, yaml_token_t *token); | |
868 | ||
03be97ab KS |
869 | /* |
870 | * Indentation treatment. | |
871 | */ | |
872 | ||
873 | static int | |
eb9cceb5 KS |
874 | yaml_parser_roll_indent(yaml_parser_t *parser, int column, |
875 | int number, yaml_token_type_t type, yaml_mark_t mark); | |
03be97ab KS |
876 | |
877 | static int | |
f2b59d4d | 878 | yaml_parser_unroll_indent(yaml_parser_t *parser, int column); |
03be97ab KS |
879 | |
880 | /* | |
881 | * Token fetchers. | |
882 | */ | |
883 | ||
884 | static int | |
885 | yaml_parser_fetch_stream_start(yaml_parser_t *parser); | |
886 | ||
887 | static int | |
888 | yaml_parser_fetch_stream_end(yaml_parser_t *parser); | |
889 | ||
890 | static int | |
891 | yaml_parser_fetch_directive(yaml_parser_t *parser); | |
892 | ||
03be97ab KS |
893 | static int |
894 | yaml_parser_fetch_document_indicator(yaml_parser_t *parser, | |
895 | yaml_token_type_t type); | |
896 | ||
03be97ab KS |
897 | static int |
898 | yaml_parser_fetch_flow_collection_start(yaml_parser_t *parser, | |
899 | yaml_token_type_t type); | |
900 | ||
03be97ab KS |
901 | static int |
902 | yaml_parser_fetch_flow_collection_end(yaml_parser_t *parser, | |
903 | yaml_token_type_t type); | |
904 | ||
905 | static int | |
906 | yaml_parser_fetch_flow_entry(yaml_parser_t *parser); | |
907 | ||
908 | static int | |
909 | yaml_parser_fetch_block_entry(yaml_parser_t *parser); | |
910 | ||
911 | static int | |
912 | yaml_parser_fetch_key(yaml_parser_t *parser); | |
913 | ||
914 | static int | |
915 | yaml_parser_fetch_value(yaml_parser_t *parser); | |
916 | ||
917 | static int | |
eb9cceb5 | 918 | yaml_parser_fetch_anchor(yaml_parser_t *parser, yaml_token_type_t type); |
03be97ab KS |
919 | |
920 | static int | |
921 | yaml_parser_fetch_tag(yaml_parser_t *parser); | |
922 | ||
03be97ab KS |
923 | static int |
924 | yaml_parser_fetch_block_scalar(yaml_parser_t *parser, int literal); | |
925 | ||
03be97ab KS |
926 | static int |
927 | yaml_parser_fetch_flow_scalar(yaml_parser_t *parser, int single); | |
928 | ||
929 | static int | |
930 | yaml_parser_fetch_plain_scalar(yaml_parser_t *parser); | |
931 | ||
932 | /* | |
933 | * Token scanners. | |
934 | */ | |
935 | ||
936 | static int | |
937 | yaml_parser_scan_to_next_token(yaml_parser_t *parser); | |
938 | ||
939 | static yaml_token_t * | |
940 | yaml_parser_scan_directive(yaml_parser_t *parser); | |
941 | ||
942 | static int | |
943 | yaml_parser_scan_directive_name(yaml_parser_t *parser, | |
944 | yaml_mark_t start_mark, yaml_char_t **name); | |
945 | ||
946 | static int | |
e71095e3 | 947 | yaml_parser_scan_version_directive_value(yaml_parser_t *parser, |
03be97ab KS |
948 | yaml_mark_t start_mark, int *major, int *minor); |
949 | ||
950 | static int | |
e71095e3 | 951 | yaml_parser_scan_version_directive_number(yaml_parser_t *parser, |
03be97ab KS |
952 | yaml_mark_t start_mark, int *number); |
953 | ||
954 | static int | |
955 | yaml_parser_scan_tag_directive_value(yaml_parser_t *parser, | |
e71095e3 | 956 | yaml_mark_t mark, yaml_char_t **handle, yaml_char_t **prefix); |
03be97ab KS |
957 | |
958 | static yaml_token_t * | |
959 | yaml_parser_scan_anchor(yaml_parser_t *parser, | |
960 | yaml_token_type_t type); | |
961 | ||
962 | static yaml_token_t * | |
963 | yaml_parser_scan_tag(yaml_parser_t *parser); | |
964 | ||
965 | static int | |
966 | yaml_parser_scan_tag_handle(yaml_parser_t *parser, int directive, | |
967 | yaml_mark_t start_mark, yaml_char_t **handle); | |
968 | ||
969 | static int | |
970 | yaml_parser_scan_tag_uri(yaml_parser_t *parser, int directive, | |
e71095e3 KS |
971 | yaml_char_t *head, yaml_mark_t start_mark, yaml_char_t **uri); |
972 | ||
973 | static int | |
974 | yaml_parser_scan_uri_escapes(yaml_parser_t *parser, int directive, | |
975 | yaml_mark_t start_mark, yaml_string_t *string); | |
03be97ab KS |
976 | |
977 | static yaml_token_t * | |
978 | yaml_parser_scan_block_scalar(yaml_parser_t *parser, int literal); | |
979 | ||
92d41fe1 KS |
980 | static int |
981 | yaml_parser_scan_block_scalar_breaks(yaml_parser_t *parser, | |
982 | int *indent, yaml_string_t *breaks, | |
983 | yaml_mark_t start_mark, yaml_mark_t *end_mark); | |
984 | ||
03be97ab KS |
985 | static yaml_token_t * |
986 | yaml_parser_scan_flow_scalar(yaml_parser_t *parser, int single); | |
987 | ||
988 | static yaml_token_t * | |
989 | yaml_parser_scan_plain_scalar(yaml_parser_t *parser); | |
990 | ||
f2b59d4d KS |
991 | /* |
992 | * Get the next token and remove it from the tokens queue. | |
993 | */ | |
994 | ||
995 | YAML_DECLARE(yaml_token_t *) | |
996 | yaml_parser_get_token(yaml_parser_t *parser) | |
997 | { | |
998 | yaml_token_t *token; | |
999 | ||
1000 | assert(parser); /* Non-NULL parser object is expected. */ | |
1001 | assert(!parser->stream_end_produced); /* No tokens after STREAM-END. */ | |
1002 | ||
1003 | /* Ensure that the tokens queue contains enough tokens. */ | |
1004 | ||
1005 | if (!yaml_parser_fetch_more_tokens(parser)) return NULL; | |
1006 | ||
1007 | /* Fetch the next token from the queue. */ | |
1008 | ||
1009 | token = parser->tokens[parser->tokens_head]; | |
1010 | ||
1011 | /* Move the queue head. */ | |
1012 | ||
1013 | parser->tokens[parser->tokens_head++] = NULL; | |
f2b59d4d KS |
1014 | |
1015 | parser->tokens_parsed++; | |
1016 | ||
7e32c194 KS |
1017 | if (token->type == YAML_STREAM_END_TOKEN) { |
1018 | parser->stream_end_produced = 1; | |
1019 | } | |
1020 | ||
f2b59d4d KS |
1021 | return token; |
1022 | } | |
1023 | ||
1024 | /* | |
1025 | * Get the next token, but don't remove it from the queue. | |
1026 | */ | |
1027 | ||
1028 | YAML_DECLARE(yaml_token_t *) | |
1029 | yaml_parser_peek_token(yaml_parser_t *parser) | |
1030 | { | |
1031 | assert(parser); /* Non-NULL parser object is expected. */ | |
1032 | assert(!parser->stream_end_produced); /* No tokens after STREAM-END. */ | |
1033 | ||
1034 | /* Ensure that the tokens queue contains enough tokens. */ | |
1035 | ||
1036 | if (!yaml_parser_fetch_more_tokens(parser)) return NULL; | |
1037 | ||
1038 | /* Fetch the next token from the queue. */ | |
1039 | ||
1040 | return parser->tokens[parser->tokens_head]; | |
1041 | } | |
1042 | ||
e71095e3 KS |
1043 | /* |
1044 | * Create a new string. | |
1045 | */ | |
1046 | ||
1047 | static yaml_string_t | |
1048 | yaml_parser_new_string(yaml_parser_t *parser) | |
1049 | { | |
1050 | yaml_string_t string = { NULL, NULL, 0 }; | |
1051 | ||
1052 | string.buffer = yaml_malloc(YAML_DEFAULT_SIZE); | |
1053 | if (!string.buffer) { | |
1054 | parser->error = YAML_MEMORY_ERROR; | |
1055 | return string; | |
1056 | } | |
1057 | ||
1058 | memset(string.buffer, 0, YAML_DEFAULT_SIZE); | |
1059 | string.pointer = string.buffer; | |
1060 | string.size = YAML_DEFAULT_SIZE; | |
1061 | ||
1062 | return string; | |
1063 | } | |
1064 | ||
1065 | /* | |
1066 | * Double the size of a string. | |
1067 | */ | |
1068 | ||
1069 | static int | |
1070 | yaml_parser_resize_string(yaml_parser_t *parser, yaml_string_t *string) | |
1071 | { | |
1072 | yaml_char_t *new_buffer = yaml_realloc(string->buffer, string->size*2); | |
1073 | ||
1074 | if (!new_buffer) { | |
1075 | yaml_free(string->buffer); | |
1076 | string->buffer = NULL; | |
1077 | string->pointer = NULL; | |
1078 | string->size = 0; | |
1079 | parser->error = YAML_MEMORY_ERROR; | |
1080 | return 0; | |
1081 | } | |
1082 | ||
1083 | memset(new_buffer+string->size, 0, string->size); | |
1084 | ||
7e32c194 | 1085 | string->pointer = new_buffer + (string->pointer-string->buffer); |
e71095e3 KS |
1086 | string->buffer = new_buffer; |
1087 | string->size *= 2; | |
1088 | ||
1089 | return 1; | |
1090 | } | |
1091 | ||
92d41fe1 KS |
1092 | /* |
1093 | * Append a string to another string. | |
1094 | */ | |
1095 | ||
1096 | static int | |
1097 | yaml_parser_join_string(yaml_parser_t *parser, | |
1098 | yaml_string_t *string1, yaml_string_t *string2) | |
1099 | { | |
1100 | if (string2->buffer == string2->pointer) return 1; | |
1101 | ||
1102 | while (string1->pointer - string1->buffer + string2->pointer - string2->buffer + 1 | |
1103 | > string1->size) { | |
1104 | if (!yaml_parser_resize_string(parser, string1)) return 0; | |
1105 | } | |
1106 | ||
1107 | memcpy(string1->pointer, string2->buffer, string2->pointer-string2->buffer); | |
7e32c194 | 1108 | string1->pointer += string2->pointer-string2->buffer; |
92d41fe1 KS |
1109 | |
1110 | return 1; | |
1111 | } | |
1112 | ||
1113 | /* | |
1114 | * Fill the string with NULs and move the pointer to the beginning. | |
1115 | */ | |
1116 | ||
1117 | static int | |
1118 | yaml_parser_clear_string(yaml_parser_t *parser, yaml_string_t *string) | |
1119 | { | |
1120 | if (string->buffer == string->pointer) return 1; | |
1121 | ||
1122 | memset(string->buffer, 0, string->pointer-string->buffer); | |
1123 | ||
1124 | string->pointer = string->buffer; | |
1125 | ||
1126 | return 1; | |
1127 | } | |
1128 | ||
e71095e3 KS |
1129 | /* |
1130 | * Double a list. | |
1131 | */ | |
1132 | ||
1133 | static int | |
1134 | yaml_parser_resize_list(yaml_parser_t *parser, void **buffer, size_t *size, | |
1135 | size_t item_size) | |
1136 | { | |
1137 | void *new_buffer = yaml_realloc(*buffer, item_size*(*size)*2); | |
1138 | ||
1139 | if (!new_buffer) { | |
1140 | parser->error = YAML_MEMORY_ERROR; | |
1141 | return 0; | |
1142 | } | |
1143 | ||
7e32c194 | 1144 | memset(new_buffer+item_size*(*size), 0, item_size*(*size)); |
e71095e3 KS |
1145 | |
1146 | *buffer = new_buffer; | |
1147 | *size *= 2; | |
1148 | ||
1149 | return 1; | |
1150 | } | |
1151 | ||
f2b59d4d KS |
1152 | /* |
1153 | * Set the scanner error and return 0. | |
1154 | */ | |
1155 | ||
1156 | static int | |
1157 | yaml_parser_set_scanner_error(yaml_parser_t *parser, const char *context, | |
1158 | yaml_mark_t context_mark, const char *problem) | |
1159 | { | |
1160 | parser->error = YAML_SCANNER_ERROR; | |
1161 | parser->context = context; | |
1162 | parser->context_mark = context_mark; | |
1163 | parser->problem = problem; | |
1164 | parser->problem_mark = yaml_parser_get_mark(parser); | |
7e32c194 KS |
1165 | |
1166 | return 0; | |
f2b59d4d KS |
1167 | } |
1168 | ||
1169 | /* | |
1170 | * Get the mark for the current buffer position. | |
1171 | */ | |
1172 | ||
1173 | static yaml_mark_t | |
1174 | yaml_parser_get_mark(yaml_parser_t *parser) | |
1175 | { | |
1176 | yaml_mark_t mark = { parser->index, parser->line, parser->column }; | |
1177 | ||
1178 | return mark; | |
1179 | } | |
1180 | ||
1181 | ||
1182 | /* | |
1183 | * Ensure that the tokens queue contains at least one token which can be | |
1184 | * returned to the Parser. | |
1185 | */ | |
1186 | ||
1187 | static int | |
1188 | yaml_parser_fetch_more_tokens(yaml_parser_t *parser) | |
1189 | { | |
1190 | int need_more_tokens; | |
1191 | int k; | |
1192 | ||
1193 | /* While we need more tokens to fetch, do it. */ | |
1194 | ||
1195 | while (1) | |
1196 | { | |
1197 | /* | |
1198 | * Check if we really need to fetch more tokens. | |
1199 | */ | |
1200 | ||
1201 | need_more_tokens = 0; | |
1202 | ||
1203 | if (parser->tokens_head == parser->tokens_tail) | |
1204 | { | |
1205 | /* Queue is empty. */ | |
1206 | ||
1207 | need_more_tokens = 1; | |
1208 | } | |
1209 | else | |
1210 | { | |
1211 | /* Check if any potential simple key may occupy the head position. */ | |
1212 | ||
7e32c194 KS |
1213 | if (!yaml_parser_stale_simple_keys(parser)) |
1214 | return 0; | |
1215 | ||
f2b59d4d KS |
1216 | for (k = 0; k <= parser->flow_level; k++) { |
1217 | yaml_simple_key_t *simple_key = parser->simple_keys[k]; | |
1218 | if (simple_key | |
1219 | && (simple_key->token_number == parser->tokens_parsed)) { | |
1220 | need_more_tokens = 1; | |
1221 | break; | |
1222 | } | |
1223 | } | |
1224 | } | |
1225 | ||
1226 | /* We are finished. */ | |
1227 | ||
1228 | if (!need_more_tokens) | |
1229 | break; | |
1230 | ||
1231 | /* Fetch the next token. */ | |
1232 | ||
1233 | if (!yaml_parser_fetch_next_token(parser)) | |
1234 | return 0; | |
1235 | } | |
1236 | ||
1237 | return 1; | |
1238 | } | |
1239 | ||
1240 | /* | |
1241 | * The dispatcher for token fetchers. | |
1242 | */ | |
1243 | ||
1244 | static int | |
1245 | yaml_parser_fetch_next_token(yaml_parser_t *parser) | |
1246 | { | |
1247 | /* Ensure that the buffer is initialized. */ | |
1248 | ||
1249 | if (!UPDATE(parser, 1)) | |
1250 | return 0; | |
1251 | ||
1252 | /* Check if we just started scanning. Fetch STREAM-START then. */ | |
1253 | ||
1254 | if (!parser->stream_start_produced) | |
1255 | return yaml_parser_fetch_stream_start(parser); | |
1256 | ||
1257 | /* Eat whitespaces and comments until we reach the next token. */ | |
1258 | ||
1259 | if (!yaml_parser_scan_to_next_token(parser)) | |
1260 | return 0; | |
1261 | ||
7e32c194 KS |
1262 | /* Remove obsolete potential simple keys. */ |
1263 | ||
1264 | if (!yaml_parser_stale_simple_keys(parser)) | |
1265 | return 0; | |
1266 | ||
f2b59d4d KS |
1267 | /* Check the indentation level against the current column. */ |
1268 | ||
1269 | if (!yaml_parser_unroll_indent(parser, parser->column)) | |
1270 | return 0; | |
1271 | ||
1272 | /* | |
1273 | * Ensure that the buffer contains at least 4 characters. 4 is the length | |
1274 | * of the longest indicators ('--- ' and '... '). | |
1275 | */ | |
1276 | ||
1277 | if (!UPDATE(parser, 4)) | |
1278 | return 0; | |
1279 | ||
1280 | /* Is it the end of the stream? */ | |
1281 | ||
1282 | if (IS_Z(parser)) | |
1283 | return yaml_parser_fetch_stream_end(parser); | |
1284 | ||
1285 | /* Is it a directive? */ | |
1286 | ||
1287 | if (parser->column == 0 && CHECK(parser, '%')) | |
1288 | return yaml_parser_fetch_directive(parser); | |
1289 | ||
1290 | /* Is it the document start indicator? */ | |
1291 | ||
1292 | if (parser->column == 0 | |
1293 | && CHECK_AT(parser, '-', 0) | |
1294 | && CHECK_AT(parser, '-', 1) | |
1295 | && CHECK_AT(parser, '-', 2) | |
1296 | && IS_BLANKZ_AT(parser, 3)) | |
eb9cceb5 KS |
1297 | return yaml_parser_fetch_document_indicator(parser, |
1298 | YAML_DOCUMENT_START_TOKEN); | |
f2b59d4d KS |
1299 | |
1300 | /* Is it the document end indicator? */ | |
1301 | ||
1302 | if (parser->column == 0 | |
1303 | && CHECK_AT(parser, '.', 0) | |
1304 | && CHECK_AT(parser, '.', 1) | |
1305 | && CHECK_AT(parser, '.', 2) | |
1306 | && IS_BLANKZ_AT(parser, 3)) | |
eb9cceb5 KS |
1307 | return yaml_parser_fetch_document_indicator(parser, |
1308 | YAML_DOCUMENT_END_TOKEN); | |
f2b59d4d KS |
1309 | |
1310 | /* Is it the flow sequence start indicator? */ | |
1311 | ||
1312 | if (CHECK(parser, '[')) | |
eb9cceb5 KS |
1313 | return yaml_parser_fetch_flow_collection_start(parser, |
1314 | YAML_FLOW_SEQUENCE_START_TOKEN); | |
f2b59d4d KS |
1315 | |
1316 | /* Is it the flow mapping start indicator? */ | |
1317 | ||
1318 | if (CHECK(parser, '{')) | |
eb9cceb5 KS |
1319 | return yaml_parser_fetch_flow_collection_start(parser, |
1320 | YAML_FLOW_MAPPING_START_TOKEN); | |
f2b59d4d KS |
1321 | |
1322 | /* Is it the flow sequence end indicator? */ | |
1323 | ||
1324 | if (CHECK(parser, ']')) | |
eb9cceb5 KS |
1325 | return yaml_parser_fetch_flow_collection_end(parser, |
1326 | YAML_FLOW_SEQUENCE_END_TOKEN); | |
f2b59d4d KS |
1327 | |
1328 | /* Is it the flow mapping end indicator? */ | |
1329 | ||
1330 | if (CHECK(parser, '}')) | |
eb9cceb5 KS |
1331 | return yaml_parser_fetch_flow_collection_end(parser, |
1332 | YAML_FLOW_MAPPING_END_TOKEN); | |
f2b59d4d KS |
1333 | |
1334 | /* Is it the flow entry indicator? */ | |
1335 | ||
1336 | if (CHECK(parser, ',')) | |
1337 | return yaml_parser_fetch_flow_entry(parser); | |
1338 | ||
1339 | /* Is it the block entry indicator? */ | |
1340 | ||
1341 | if (CHECK(parser, '-') && IS_BLANKZ_AT(parser, 1)) | |
1342 | return yaml_parser_fetch_block_entry(parser); | |
1343 | ||
1344 | /* Is it the key indicator? */ | |
1345 | ||
7e32c194 | 1346 | if (CHECK(parser, '?') && (parser->flow_level || IS_BLANKZ_AT(parser, 1))) |
f2b59d4d KS |
1347 | return yaml_parser_fetch_key(parser); |
1348 | ||
1349 | /* Is it the value indicator? */ | |
1350 | ||
7e32c194 | 1351 | if (CHECK(parser, ':') && (parser->flow_level || IS_BLANKZ_AT(parser, 1))) |
f2b59d4d KS |
1352 | return yaml_parser_fetch_value(parser); |
1353 | ||
1354 | /* Is it an alias? */ | |
1355 | ||
1356 | if (CHECK(parser, '*')) | |
eb9cceb5 | 1357 | return yaml_parser_fetch_anchor(parser, YAML_ALIAS_TOKEN); |
f2b59d4d KS |
1358 | |
1359 | /* Is it an anchor? */ | |
1360 | ||
1361 | if (CHECK(parser, '&')) | |
eb9cceb5 | 1362 | return yaml_parser_fetch_anchor(parser, YAML_ANCHOR_TOKEN); |
f2b59d4d KS |
1363 | |
1364 | /* Is it a tag? */ | |
1365 | ||
1366 | if (CHECK(parser, '!')) | |
1367 | return yaml_parser_fetch_tag(parser); | |
1368 | ||
1369 | /* Is it a literal scalar? */ | |
1370 | ||
1371 | if (CHECK(parser, '|') && !parser->flow_level) | |
1372 | return yaml_parser_fetch_block_scalar(parser, 1); | |
1373 | ||
1374 | /* Is it a folded scalar? */ | |
1375 | ||
1376 | if (CHECK(parser, '>') && !parser->flow_level) | |
1377 | return yaml_parser_fetch_block_scalar(parser, 0); | |
1378 | ||
1379 | /* Is it a single-quoted scalar? */ | |
1380 | ||
1381 | if (CHECK(parser, '\'')) | |
1382 | return yaml_parser_fetch_flow_scalar(parser, 1); | |
1383 | ||
1384 | /* Is it a double-quoted scalar? */ | |
1385 | ||
1386 | if (CHECK(parser, '"')) | |
1387 | return yaml_parser_fetch_flow_scalar(parser, 0); | |
1388 | ||
1389 | /* | |
1390 | * Is it a plain scalar? | |
1391 | * | |
1392 | * A plain scalar may start with any non-blank characters except | |
1393 | * | |
1394 | * '-', '?', ':', ',', '[', ']', '{', '}', | |
1395 | * '#', '&', '*', '!', '|', '>', '\'', '\"', | |
1396 | * '%', '@', '`'. | |
1397 | * | |
7e32c194 KS |
1398 | * In the block context (and, for the '-' indicator, in the flow context |
1399 | * too), it may also start with the characters | |
f2b59d4d KS |
1400 | * |
1401 | * '-', '?', ':' | |
1402 | * | |
1403 | * if it is followed by a non-space character. | |
1404 | * | |
1405 | * The last rule is more restrictive than the specification requires. | |
1406 | */ | |
1407 | ||
1408 | if (!(IS_BLANKZ(parser) || CHECK(parser, '-') || CHECK(parser, '?') | |
1409 | || CHECK(parser, ':') || CHECK(parser, ',') || CHECK(parser, '[') | |
1410 | || CHECK(parser, ']') || CHECK(parser, '{') || CHECK(parser, '}') | |
1411 | || CHECK(parser, '#') || CHECK(parser, '&') || CHECK(parser, '*') | |
1412 | || CHECK(parser, '!') || CHECK(parser, '|') || CHECK(parser, '>') | |
1413 | || CHECK(parser, '\'') || CHECK(parser, '"') || CHECK(parser, '%') | |
1414 | || CHECK(parser, '@') || CHECK(parser, '`')) || | |
7e32c194 | 1415 | (CHECK(parser, '-') && !IS_BLANK_AT(parser, 1)) || |
f2b59d4d | 1416 | (!parser->flow_level && |
7e32c194 | 1417 | (CHECK(parser, '?') || CHECK(parser, ':')) && !IS_BLANKZ_AT(parser, 1))) |
f2b59d4d KS |
1418 | return yaml_parser_fetch_plain_scalar(parser); |
1419 | ||
1420 | /* | |
1421 | * If we don't determine the token type so far, it is an error. | |
1422 | */ | |
1423 | ||
1424 | return yaml_parser_set_scanner_error(parser, "while scanning for the next token", | |
1425 | yaml_parser_get_mark(parser), "found character that cannot start any token"); | |
1426 | } | |
1427 | ||
eb9cceb5 KS |
1428 | /* |
1429 | * Check the list of potential simple keys and remove the positions that | |
1430 | * cannot contain simple keys anymore. | |
1431 | */ | |
1432 | ||
1433 | static int | |
1434 | yaml_parser_stale_simple_keys(yaml_parser_t *parser) | |
1435 | { | |
1436 | int level; | |
1437 | ||
1438 | /* Check for a potential simple key for each flow level. */ | |
1439 | ||
1440 | for (level = 0; level <= parser->flow_level; level++) | |
1441 | { | |
1442 | yaml_simple_key_t *simple_key = parser->simple_keys[level]; | |
1443 | ||
1444 | /* | |
1445 | * The specification requires that a simple key | |
1446 | * | |
1447 | * - is limited to a single line, | |
1448 | * - is shorter than 1024 characters. | |
1449 | */ | |
1450 | ||
1451 | if (simple_key && (simple_key->line < parser->line || | |
7e32c194 | 1452 | simple_key->index+1024 < parser->index)) { |
eb9cceb5 KS |
1453 | |
1454 | /* Check if the potential simple key to be removed is required. */ | |
1455 | ||
1456 | if (simple_key->required) { | |
1457 | return yaml_parser_set_scanner_error(parser, | |
1458 | "while scanning a simple key", simple_key->mark, | |
1459 | "could not found expected ':'"); | |
1460 | } | |
1461 | ||
1462 | yaml_free(simple_key); | |
1463 | parser->simple_keys[level] = NULL; | |
1464 | } | |
1465 | } | |
1466 | ||
1467 | return 1; | |
1468 | } | |
1469 | ||
1470 | /* | |
1471 | * Check if a simple key may start at the current position and add it if | |
1472 | * needed. | |
1473 | */ | |
1474 | ||
1475 | static int | |
1476 | yaml_parser_save_simple_key(yaml_parser_t *parser) | |
1477 | { | |
1478 | /* | |
1479 | * A simple key is required at the current position if the scanner is in | |
1480 | * the block context and the current column coincides with the indentation | |
1481 | * level. | |
1482 | */ | |
1483 | ||
1484 | int required = (!parser->flow_level && parser->indent == parser->column); | |
1485 | ||
1486 | /* | |
1487 | * A simple key is required only when it is the first token in the current | |
1488 | * line. Therefore it is always allowed. But we add a check anyway. | |
1489 | */ | |
1490 | ||
1491 | assert(parser->simple_key_allowed || !required); /* Impossible. */ | |
1492 | ||
1493 | /* | |
1494 | * If the current position may start a simple key, save it. | |
1495 | */ | |
1496 | ||
1497 | if (parser->simple_key_allowed) | |
1498 | { | |
1499 | yaml_simple_key_t simple_key = { required, | |
1500 | parser->tokens_parsed + parser->tokens_tail - parser->tokens_head, | |
1501 | parser->index, parser->line, parser->column, | |
1502 | yaml_parser_get_mark(parser) }; | |
1503 | ||
1504 | if (!yaml_parser_remove_simple_key(parser)) return 0; | |
1505 | ||
1506 | parser->simple_keys[parser->flow_level] = | |
1507 | yaml_malloc(sizeof(yaml_simple_key_t)); | |
1508 | if (!parser->simple_keys[parser->flow_level]) { | |
1509 | parser->error = YAML_MEMORY_ERROR; | |
1510 | return 0; | |
1511 | } | |
1512 | ||
1513 | *(parser->simple_keys[parser->flow_level]) = simple_key; | |
1514 | } | |
1515 | ||
1516 | return 1; | |
1517 | } | |
1518 | ||
1519 | /* | |
1520 | * Remove a potential simple key at the current flow level. | |
1521 | */ | |
1522 | ||
1523 | static int | |
1524 | yaml_parser_remove_simple_key(yaml_parser_t *parser) | |
1525 | { | |
1526 | yaml_simple_key_t *simple_key = parser->simple_keys[parser->flow_level]; | |
1527 | ||
1528 | if (simple_key) | |
1529 | { | |
1530 | /* If the key is required, it is an error. */ | |
1531 | ||
1532 | if (simple_key->required) { | |
1533 | return yaml_parser_set_scanner_error(parser, | |
1534 | "while scanning a simple key", simple_key->mark, | |
1535 | "could not found expected ':'"); | |
1536 | } | |
1537 | ||
1538 | /* Remove the key from the list. */ | |
1539 | ||
1540 | yaml_free(simple_key); | |
1541 | parser->simple_keys[parser->flow_level] = NULL; | |
1542 | } | |
1543 | ||
1544 | return 1; | |
1545 | } | |
1546 | ||
1547 | /* | |
1548 | * Increase the flow level and resize the simple key list if needed. | |
1549 | */ | |
1550 | ||
1551 | static int | |
1552 | yaml_parser_increase_flow_level(yaml_parser_t *parser) | |
1553 | { | |
1554 | /* Check if we need to resize the list. */ | |
1555 | ||
e71095e3 KS |
1556 | if (parser->flow_level == parser->simple_keys_size-1) { |
1557 | if (!yaml_parser_resize_list(parser, (void **)&parser->simple_keys, | |
1558 | &parser->simple_keys_size, sizeof(yaml_simple_key_t *))) | |
eb9cceb5 | 1559 | return 0; |
eb9cceb5 KS |
1560 | } |
1561 | ||
1562 | /* Increase the flow level and reset the simple key. */ | |
1563 | ||
1564 | parser->simple_keys[++parser->flow_level] = NULL; | |
1565 | ||
1566 | return 1; | |
1567 | } | |
1568 | ||
1569 | /* | |
1570 | * Decrease the flow level. | |
1571 | */ | |
1572 | ||
1573 | static int | |
1574 | yaml_parser_decrease_flow_level(yaml_parser_t *parser) | |
1575 | { | |
1576 | assert(parser->flow_level); /* Greater than 0. */ | |
1577 | assert(!parser->simple_keys[parser->flow_level]); /* Must be removed. */ | |
1578 | ||
1579 | parser->flow_level --; | |
1580 | ||
1581 | return 1; | |
1582 | } | |
1583 | ||
1584 | /* | |
1585 | * Add a token to the tail of the tokens queue. | |
1586 | */ | |
1587 | ||
1588 | static int | |
1589 | yaml_parser_append_token(yaml_parser_t *parser, yaml_token_t *token) | |
1590 | { | |
1591 | return yaml_parser_insert_token(parser, -1, token); | |
1592 | } | |
1593 | ||
1594 | /* | |
1595 | * Insert the token into the tokens queue. The number parameter is the | |
1596 | * ordinal number of the token. If the number is equal to -1, add the token | |
1597 | * to the tail of the queue. | |
1598 | */ | |
1599 | ||
1600 | static int | |
1601 | yaml_parser_insert_token(yaml_parser_t *parser, | |
1602 | int number, yaml_token_t *token) | |
1603 | { | |
1604 | /* The index of the token in the queue. */ | |
1605 | ||
1606 | int index = (number == -1) | |
1607 | ? parser->tokens_tail - parser->tokens_head | |
1608 | : number - parser->tokens_parsed; | |
1609 | ||
1610 | assert(index >= 0 && index <= (parser->tokens_tail-parser->tokens_head)); | |
1611 | ||
1612 | /* Check if we need to resize the queue. */ | |
1613 | ||
e71095e3 KS |
1614 | if (parser->tokens_head == 0 && parser->tokens_tail == parser->tokens_size) { |
1615 | if (!yaml_parser_resize_list(parser, (void **)&parser->tokens, | |
1616 | &parser->tokens_size, sizeof(yaml_token_t *))) | |
eb9cceb5 | 1617 | return 0; |
eb9cceb5 KS |
1618 | } |
1619 | ||
1620 | /* Check if we need to move the queue to the beginning of the buffer. */ | |
1621 | ||
1622 | if (parser->tokens_tail == parser->tokens_size) | |
1623 | { | |
1624 | if (parser->tokens_head < parser->tokens_tail) { | |
1625 | memmove(parser->tokens, parser->tokens+parser->tokens_head, | |
1626 | sizeof(yaml_token_t *)*(parser->tokens_tail-parser->tokens_head)); | |
1627 | } | |
1628 | parser->tokens_tail -= parser->tokens_head; | |
1629 | parser->tokens_head = 0; | |
1630 | } | |
1631 | ||
1632 | /* Check if we need to free space within the queue. */ | |
1633 | ||
1634 | if (index < (parser->tokens_tail-parser->tokens_head)) { | |
1635 | memmove(parser->tokens+parser->tokens_head+index+1, | |
1636 | parser->tokens+parser->tokens_head+index, | |
1637 | sizeof(yaml_token_t *)*(parser->tokens_tail-parser->tokens_head-index)); | |
1638 | } | |
1639 | ||
1640 | /* Insert the token. */ | |
1641 | ||
1642 | parser->tokens[parser->tokens_head+index] = token; | |
1643 | parser->tokens_tail ++; | |
1644 | ||
1645 | return 1; | |
1646 | } | |
1647 | ||
1648 | /* | |
1649 | * Push the current indentation level to the stack and set the new level | |
1650 | * the current column is greater than the indentation level. In this case, | |
1651 | * append or insert the specified token into the token queue. | |
1652 | * | |
1653 | */ | |
1654 | ||
1655 | static int | |
1656 | yaml_parser_roll_indent(yaml_parser_t *parser, int column, | |
1657 | int number, yaml_token_type_t type, yaml_mark_t mark) | |
1658 | { | |
1659 | yaml_token_t *token; | |
1660 | ||
1661 | /* In the flow context, do nothing. */ | |
1662 | ||
1663 | if (parser->flow_level) | |
1664 | return 1; | |
1665 | ||
1666 | if (parser->indent < column) | |
1667 | { | |
1668 | /* Check if we need to expand the indents stack. */ | |
1669 | ||
e71095e3 KS |
1670 | if (parser->indents_length == parser->indents_size) { |
1671 | if (!yaml_parser_resize_list(parser, (void **)&parser->indents, | |
1672 | &parser->indents_size, sizeof(int))) | |
eb9cceb5 | 1673 | return 0; |
eb9cceb5 KS |
1674 | } |
1675 | ||
1676 | /* | |
1677 | * Push the current indentation level to the stack and set the new | |
1678 | * indentation level. | |
1679 | */ | |
1680 | ||
1681 | parser->indents[parser->indents_length++] = parser->indent; | |
1682 | parser->indent = column; | |
1683 | ||
1684 | /* Create a token. */ | |
1685 | ||
1686 | token = yaml_token_new(type, mark, mark); | |
1687 | if (!token) { | |
1688 | parser->error = YAML_MEMORY_ERROR; | |
1689 | return 0; | |
1690 | } | |
1691 | ||
1692 | /* Insert the token into the queue. */ | |
1693 | ||
1694 | if (!yaml_parser_insert_token(parser, number, token)) { | |
1695 | yaml_token_delete(token); | |
1696 | return 0; | |
1697 | } | |
1698 | } | |
1699 | ||
1700 | return 1; | |
1701 | } | |
1702 | ||
1703 | /* | |
1704 | * Pop indentation levels from the indents stack until the current level | |
1705 | * becomes less or equal to the column. For each intendation level, append | |
1706 | * the BLOCK-END token. | |
1707 | */ | |
1708 | ||
1709 | ||
1710 | static int | |
1711 | yaml_parser_unroll_indent(yaml_parser_t *parser, int column) | |
1712 | { | |
1713 | yaml_token_t *token; | |
1714 | ||
1715 | /* In the flow context, do nothing. */ | |
1716 | ||
1717 | if (parser->flow_level) | |
1718 | return 1; | |
1719 | ||
1720 | /* Loop through the intendation levels in the stack. */ | |
1721 | ||
1722 | while (parser->indent > column) | |
1723 | { | |
1724 | yaml_mark_t mark = yaml_parser_get_mark(parser); | |
1725 | ||
1726 | /* Create a token. */ | |
1727 | ||
1728 | token = yaml_token_new(YAML_BLOCK_END_TOKEN, mark, mark); | |
1729 | if (!token) { | |
1730 | parser->error = YAML_MEMORY_ERROR; | |
1731 | return 0; | |
1732 | } | |
1733 | ||
1734 | /* Append the token to the queue. */ | |
1735 | ||
1736 | if (!yaml_parser_append_token(parser, token)) { | |
1737 | yaml_token_delete(token); | |
1738 | return 0; | |
1739 | } | |
1740 | ||
1741 | /* Pop the indentation level. */ | |
1742 | ||
1743 | assert(parser->indents_length); /* Non-empty stack expected. */ | |
1744 | ||
1745 | parser->indent = parser->indents[--parser->indents_length]; | |
1746 | } | |
1747 | ||
1748 | return 1; | |
1749 | } | |
1750 | ||
1751 | /* | |
1752 | * Initialize the scanner and produce the STREAM-START token. | |
1753 | */ | |
1754 | ||
1755 | static int | |
1756 | yaml_parser_fetch_stream_start(yaml_parser_t *parser) | |
1757 | { | |
1758 | yaml_mark_t mark = yaml_parser_get_mark(parser); | |
1759 | yaml_token_t *token; | |
1760 | ||
1761 | /* Set the initial indentation. */ | |
1762 | ||
1763 | parser->indent = -1; | |
1764 | ||
1765 | /* A simple key is allowed at the beginning of the stream. */ | |
1766 | ||
1767 | parser->simple_key_allowed = 1; | |
1768 | ||
1769 | /* We have started. */ | |
1770 | ||
1771 | parser->stream_start_produced = 1; | |
1772 | ||
1773 | /* Create the STREAM-START token. */ | |
1774 | ||
1775 | token = yaml_stream_start_token_new(parser->encoding, mark, mark); | |
1776 | if (!token) { | |
1777 | parser->error = YAML_MEMORY_ERROR; | |
1778 | return 0; | |
1779 | } | |
1780 | ||
1781 | /* Append the token to the queue. */ | |
1782 | ||
1783 | if (!yaml_parser_append_token(parser, token)) { | |
1784 | yaml_token_delete(token); | |
1785 | return 0; | |
1786 | } | |
1787 | ||
1788 | return 1; | |
1789 | } | |
1790 | ||
1791 | /* | |
1792 | * Produce the STREAM-END token and shut down the scanner. | |
1793 | */ | |
1794 | ||
1795 | static int | |
1796 | yaml_parser_fetch_stream_end(yaml_parser_t *parser) | |
1797 | { | |
1798 | yaml_mark_t mark = yaml_parser_get_mark(parser); | |
1799 | yaml_token_t *token; | |
1800 | ||
1801 | /* Reset the indentation level. */ | |
1802 | ||
1803 | if (!yaml_parser_unroll_indent(parser, -1)) | |
1804 | return 0; | |
1805 | ||
7e32c194 | 1806 | /* Reset simple keys. */ |
eb9cceb5 | 1807 | |
7e32c194 KS |
1808 | if (!yaml_parser_remove_simple_key(parser)) |
1809 | return 0; | |
1810 | ||
1811 | parser->simple_key_allowed = 0; | |
eb9cceb5 KS |
1812 | |
1813 | /* Create the STREAM-END token. */ | |
1814 | ||
1815 | token = yaml_stream_end_token_new(mark, mark); | |
1816 | if (!token) { | |
1817 | parser->error = YAML_MEMORY_ERROR; | |
1818 | return 0; | |
1819 | } | |
1820 | ||
1821 | /* Append the token to the queue. */ | |
1822 | ||
1823 | if (!yaml_parser_append_token(parser, token)) { | |
1824 | yaml_token_delete(token); | |
1825 | return 0; | |
1826 | } | |
1827 | ||
1828 | return 1; | |
1829 | } | |
1830 | ||
1831 | /* | |
1832 | * Produce the YAML-DIRECTIVE or TAG-DIRECTIVE token. | |
1833 | */ | |
1834 | ||
1835 | static int | |
1836 | yaml_parser_fetch_directive(yaml_parser_t *parser) | |
1837 | { | |
1838 | yaml_token_t *token; | |
1839 | ||
1840 | /* Reset the indentation level. */ | |
1841 | ||
1842 | if (!yaml_parser_unroll_indent(parser, -1)) | |
1843 | return 0; | |
1844 | ||
1845 | /* Reset simple keys. */ | |
1846 | ||
1847 | if (!yaml_parser_remove_simple_key(parser)) | |
1848 | return 0; | |
1849 | ||
1850 | parser->simple_key_allowed = 0; | |
1851 | ||
1852 | /* Create the YAML-DIRECTIVE or TAG-DIRECTIVE token. */ | |
1853 | ||
1854 | token = yaml_parser_scan_directive(parser); | |
1855 | if (!token) return 0; | |
1856 | ||
1857 | /* Append the token to the queue. */ | |
1858 | ||
1859 | if (!yaml_parser_append_token(parser, token)) { | |
1860 | yaml_token_delete(token); | |
1861 | return 0; | |
1862 | } | |
1863 | ||
1864 | return 1; | |
1865 | } | |
1866 | ||
1867 | /* | |
1868 | * Produce the DOCUMENT-START or DOCUMENT-END token. | |
1869 | */ | |
1870 | ||
1871 | static int | |
1872 | yaml_parser_fetch_document_indicator(yaml_parser_t *parser, | |
1873 | yaml_token_type_t type) | |
1874 | { | |
1875 | yaml_mark_t start_mark, end_mark; | |
1876 | yaml_token_t *token; | |
1877 | ||
1878 | /* Reset the indentation level. */ | |
1879 | ||
1880 | if (!yaml_parser_unroll_indent(parser, -1)) | |
1881 | return 0; | |
1882 | ||
1883 | /* Reset simple keys. */ | |
1884 | ||
1885 | if (!yaml_parser_remove_simple_key(parser)) | |
1886 | return 0; | |
1887 | ||
1888 | parser->simple_key_allowed = 0; | |
1889 | ||
1890 | /* Consume the token. */ | |
1891 | ||
1892 | start_mark = yaml_parser_get_mark(parser); | |
1893 | ||
1894 | FORWARD(parser); | |
1895 | FORWARD(parser); | |
1896 | FORWARD(parser); | |
1897 | ||
1898 | end_mark = yaml_parser_get_mark(parser); | |
1899 | ||
1900 | /* Create the DOCUMENT-START or DOCUMENT-END token. */ | |
1901 | ||
1902 | token = yaml_token_new(type, start_mark, end_mark); | |
1903 | if (!token) { | |
1904 | parser->error = YAML_MEMORY_ERROR; | |
1905 | return 0; | |
1906 | } | |
1907 | ||
1908 | /* Append the token to the queue. */ | |
1909 | ||
1910 | if (!yaml_parser_append_token(parser, token)) { | |
1911 | yaml_token_delete(token); | |
1912 | return 0; | |
1913 | } | |
1914 | ||
1915 | return 1; | |
1916 | } | |
1917 | ||
1918 | /* | |
1919 | * Produce the FLOW-SEQUENCE-START or FLOW-MAPPING-START token. | |
1920 | */ | |
1921 | ||
1922 | static int | |
1923 | yaml_parser_fetch_flow_collection_start(yaml_parser_t *parser, | |
1924 | yaml_token_type_t type) | |
1925 | { | |
1926 | yaml_mark_t start_mark, end_mark; | |
1927 | yaml_token_t *token; | |
1928 | ||
1929 | /* The indicators '[' and '{' may start a simple key. */ | |
1930 | ||
1931 | if (!yaml_parser_save_simple_key(parser)) | |
1932 | return 0; | |
1933 | ||
1934 | /* Increase the flow level. */ | |
1935 | ||
1936 | if (!yaml_parser_increase_flow_level(parser)) | |
1937 | return 0; | |
1938 | ||
1939 | /* A simple key may follow the indicators '[' and '{'. */ | |
1940 | ||
1941 | parser->simple_key_allowed = 1; | |
1942 | ||
1943 | /* Consume the token. */ | |
1944 | ||
1945 | start_mark = yaml_parser_get_mark(parser); | |
1946 | FORWARD(parser); | |
1947 | end_mark = yaml_parser_get_mark(parser); | |
1948 | ||
1949 | /* Create the FLOW-SEQUENCE-START of FLOW-MAPPING-START token. */ | |
1950 | ||
1951 | token = yaml_token_new(type, start_mark, end_mark); | |
1952 | if (!token) { | |
1953 | parser->error = YAML_MEMORY_ERROR; | |
1954 | return 0; | |
1955 | } | |
1956 | ||
1957 | /* Append the token to the queue. */ | |
1958 | ||
1959 | if (!yaml_parser_append_token(parser, token)) { | |
1960 | yaml_token_delete(token); | |
1961 | return 0; | |
1962 | } | |
1963 | ||
1964 | return 1; | |
1965 | } | |
1966 | ||
1967 | /* | |
1968 | * Produce the FLOW-SEQUENCE-END or FLOW-MAPPING-END token. | |
1969 | */ | |
1970 | ||
1971 | static int | |
1972 | yaml_parser_fetch_flow_collection_end(yaml_parser_t *parser, | |
1973 | yaml_token_type_t type) | |
1974 | { | |
1975 | yaml_mark_t start_mark, end_mark; | |
1976 | yaml_token_t *token; | |
1977 | ||
1978 | /* Reset any potential simple key on the current flow level. */ | |
1979 | ||
1980 | if (!yaml_parser_remove_simple_key(parser)) | |
1981 | return 0; | |
1982 | ||
1983 | /* Decrease the flow level. */ | |
1984 | ||
1985 | if (!yaml_parser_decrease_flow_level(parser)) | |
1986 | return 0; | |
1987 | ||
1988 | /* No simple keys after the indicators ']' and '}'. */ | |
1989 | ||
1990 | parser->simple_key_allowed = 0; | |
1991 | ||
1992 | /* Consume the token. */ | |
1993 | ||
1994 | start_mark = yaml_parser_get_mark(parser); | |
1995 | FORWARD(parser); | |
1996 | end_mark = yaml_parser_get_mark(parser); | |
1997 | ||
1998 | /* Create the FLOW-SEQUENCE-END of FLOW-MAPPING-END token. */ | |
1999 | ||
2000 | token = yaml_token_new(type, start_mark, end_mark); | |
2001 | if (!token) { | |
2002 | parser->error = YAML_MEMORY_ERROR; | |
2003 | return 0; | |
2004 | } | |
2005 | ||
2006 | /* Append the token to the queue. */ | |
2007 | ||
2008 | if (!yaml_parser_append_token(parser, token)) { | |
2009 | yaml_token_delete(token); | |
2010 | return 0; | |
2011 | } | |
2012 | ||
2013 | return 1; | |
2014 | } | |
2015 | ||
2016 | /* | |
2017 | * Produce the FLOW-ENTRY token. | |
2018 | */ | |
2019 | ||
2020 | static int | |
2021 | yaml_parser_fetch_flow_entry(yaml_parser_t *parser) | |
2022 | { | |
2023 | yaml_mark_t start_mark, end_mark; | |
2024 | yaml_token_t *token; | |
2025 | ||
2026 | /* Reset any potential simple keys on the current flow level. */ | |
2027 | ||
2028 | if (!yaml_parser_remove_simple_key(parser)) | |
2029 | return 0; | |
2030 | ||
2031 | /* Simple keys are allowed after ','. */ | |
2032 | ||
2033 | parser->simple_key_allowed = 1; | |
2034 | ||
2035 | /* Consume the token. */ | |
2036 | ||
2037 | start_mark = yaml_parser_get_mark(parser); | |
2038 | FORWARD(parser); | |
2039 | end_mark = yaml_parser_get_mark(parser); | |
2040 | ||
2041 | /* Create the FLOW-ENTRY token. */ | |
2042 | ||
2043 | token = yaml_token_new(YAML_FLOW_ENTRY_TOKEN, start_mark, end_mark); | |
2044 | if (!token) { | |
2045 | parser->error = YAML_MEMORY_ERROR; | |
2046 | return 0; | |
2047 | } | |
2048 | ||
2049 | /* Append the token to the queue. */ | |
2050 | ||
2051 | if (!yaml_parser_append_token(parser, token)) { | |
2052 | yaml_token_delete(token); | |
2053 | return 0; | |
2054 | } | |
2055 | ||
2056 | return 1; | |
2057 | } | |
2058 | ||
2059 | /* | |
2060 | * Produce the BLOCK-ENTRY token. | |
2061 | */ | |
2062 | ||
2063 | static int | |
2064 | yaml_parser_fetch_block_entry(yaml_parser_t *parser) | |
2065 | { | |
2066 | yaml_mark_t start_mark, end_mark; | |
2067 | yaml_token_t *token; | |
2068 | ||
2069 | /* Check if the scanner is in the block context. */ | |
2070 | ||
2071 | if (!parser->flow_level) | |
2072 | { | |
2073 | /* Check if we are allowed to start a new entry. */ | |
2074 | ||
2075 | if (!parser->simple_key_allowed) { | |
2076 | return yaml_parser_set_scanner_error(parser, NULL, | |
2077 | yaml_parser_get_mark(parser), | |
2078 | "block sequence entries are not allowed in this context"); | |
2079 | } | |
2080 | ||
2081 | /* Add the BLOCK-SEQUENCE-START token if needed. */ | |
2082 | ||
2083 | if (!yaml_parser_roll_indent(parser, parser->column, -1, | |
2084 | YAML_BLOCK_SEQUENCE_START_TOKEN, yaml_parser_get_mark(parser))) | |
2085 | return 0; | |
2086 | } | |
2087 | else | |
2088 | { | |
2089 | /* | |
2090 | * It is an error for the '-' indicator to occur in the flow context, | |
2091 | * but we let the Parser detect and report about it because the Parser | |
2092 | * is able to point to the context. | |
2093 | */ | |
2094 | } | |
2095 | ||
2096 | /* Reset any potential simple keys on the current flow level. */ | |
2097 | ||
2098 | if (!yaml_parser_remove_simple_key(parser)) | |
2099 | return 0; | |
2100 | ||
2101 | /* Simple keys are allowed after '-'. */ | |
2102 | ||
2103 | parser->simple_key_allowed = 1; | |
2104 | ||
2105 | /* Consume the token. */ | |
2106 | ||
2107 | start_mark = yaml_parser_get_mark(parser); | |
2108 | FORWARD(parser); | |
2109 | end_mark = yaml_parser_get_mark(parser); | |
2110 | ||
2111 | /* Create the BLOCK-ENTRY token. */ | |
2112 | ||
2113 | token = yaml_token_new(YAML_BLOCK_ENTRY_TOKEN, start_mark, end_mark); | |
2114 | if (!token) { | |
2115 | parser->error = YAML_MEMORY_ERROR; | |
2116 | return 0; | |
2117 | } | |
2118 | ||
2119 | /* Append the token to the queue. */ | |
2120 | ||
2121 | if (!yaml_parser_append_token(parser, token)) { | |
2122 | yaml_token_delete(token); | |
2123 | return 0; | |
2124 | } | |
2125 | ||
2126 | return 1; | |
2127 | } | |
2128 | ||
2129 | /* | |
2130 | * Produce the KEY token. | |
2131 | */ | |
2132 | ||
2133 | static int | |
2134 | yaml_parser_fetch_key(yaml_parser_t *parser) | |
2135 | { | |
2136 | yaml_mark_t start_mark, end_mark; | |
2137 | yaml_token_t *token; | |
2138 | ||
2139 | /* In the block context, additional checks are required. */ | |
2140 | ||
2141 | if (!parser->flow_level) | |
2142 | { | |
2143 | /* Check if we are allowed to start a new key (not nessesary simple). */ | |
2144 | ||
2145 | if (!parser->simple_key_allowed) { | |
2146 | return yaml_parser_set_scanner_error(parser, NULL, | |
2147 | yaml_parser_get_mark(parser), | |
2148 | "mapping keys are not allowed in this context"); | |
2149 | } | |
2150 | ||
2151 | /* Add the BLOCK-MAPPING-START token if needed. */ | |
2152 | ||
2153 | if (!yaml_parser_roll_indent(parser, parser->column, -1, | |
2154 | YAML_BLOCK_MAPPING_START_TOKEN, yaml_parser_get_mark(parser))) | |
2155 | return 0; | |
2156 | } | |
2157 | ||
2158 | /* Reset any potential simple keys on the current flow level. */ | |
2159 | ||
2160 | if (!yaml_parser_remove_simple_key(parser)) | |
2161 | return 0; | |
2162 | ||
2163 | /* Simple keys are allowed after '?' in the block context. */ | |
2164 | ||
2165 | parser->simple_key_allowed = (!parser->flow_level); | |
2166 | ||
2167 | /* Consume the token. */ | |
2168 | ||
2169 | start_mark = yaml_parser_get_mark(parser); | |
2170 | FORWARD(parser); | |
2171 | end_mark = yaml_parser_get_mark(parser); | |
2172 | ||
2173 | /* Create the KEY token. */ | |
2174 | ||
2175 | token = yaml_token_new(YAML_KEY_TOKEN, start_mark, end_mark); | |
2176 | if (!token) { | |
2177 | parser->error = YAML_MEMORY_ERROR; | |
2178 | return 0; | |
2179 | } | |
2180 | ||
2181 | /* Append the token to the queue. */ | |
2182 | ||
2183 | if (!yaml_parser_append_token(parser, token)) { | |
2184 | yaml_token_delete(token); | |
2185 | return 0; | |
2186 | } | |
2187 | ||
2188 | return 1; | |
2189 | } | |
2190 | ||
2191 | /* | |
2192 | * Produce the VALUE token. | |
2193 | */ | |
2194 | ||
2195 | static int | |
2196 | yaml_parser_fetch_value(yaml_parser_t *parser) | |
2197 | { | |
2198 | yaml_mark_t start_mark, end_mark; | |
2199 | yaml_token_t *token; | |
2200 | ||
2201 | /* Have we found a simple key? */ | |
2202 | ||
2203 | if (parser->simple_keys[parser->flow_level]) | |
2204 | { | |
2205 | yaml_simple_key_t *simple_key = parser->simple_keys[parser->flow_level]; | |
2206 | ||
2207 | /* Create the KEY token. */ | |
2208 | ||
2209 | token = yaml_token_new(YAML_KEY_TOKEN, simple_key->mark, simple_key->mark); | |
2210 | if (!token) { | |
2211 | parser->error = YAML_MEMORY_ERROR; | |
2212 | return 0; | |
2213 | } | |
2214 | ||
2215 | /* Insert the token into the queue. */ | |
2216 | ||
2217 | if (!yaml_parser_insert_token(parser, simple_key->token_number, token)) { | |
2218 | yaml_token_delete(token); | |
2219 | return 0; | |
2220 | } | |
2221 | ||
2222 | /* In the block context, we may need to add the BLOCK-MAPPING-START token. */ | |
2223 | ||
7e32c194 | 2224 | if (!yaml_parser_roll_indent(parser, simple_key->column, |
eb9cceb5 KS |
2225 | simple_key->token_number, |
2226 | YAML_BLOCK_MAPPING_START_TOKEN, simple_key->mark)) | |
2227 | return 0; | |
2228 | ||
2229 | /* Remove the simple key from the list. */ | |
2230 | ||
e71095e3 KS |
2231 | yaml_free(simple_key); |
2232 | parser->simple_keys[parser->flow_level] = NULL; | |
eb9cceb5 KS |
2233 | |
2234 | /* A simple key cannot follow another simple key. */ | |
2235 | ||
2236 | parser->simple_key_allowed = 0; | |
2237 | } | |
2238 | else | |
2239 | { | |
2240 | /* The ':' indicator follows a complex key. */ | |
2241 | ||
2242 | /* In the block context, extra checks are required. */ | |
2243 | ||
2244 | if (!parser->flow_level) | |
2245 | { | |
2246 | /* Check if we are allowed to start a complex value. */ | |
2247 | ||
2248 | if (!parser->simple_key_allowed) { | |
2249 | return yaml_parser_set_scanner_error(parser, NULL, | |
2250 | yaml_parser_get_mark(parser), | |
2251 | "mapping values are not allowed in this context"); | |
2252 | } | |
2253 | ||
2254 | /* Add the BLOCK-MAPPING-START token if needed. */ | |
2255 | ||
2256 | if (!yaml_parser_roll_indent(parser, parser->column, -1, | |
2257 | YAML_BLOCK_MAPPING_START_TOKEN, yaml_parser_get_mark(parser))) | |
2258 | return 0; | |
2259 | } | |
2260 | ||
eb9cceb5 KS |
2261 | /* Simple keys after ':' are allowed in the block context. */ |
2262 | ||
2263 | parser->simple_key_allowed = (!parser->flow_level); | |
2264 | } | |
2265 | ||
2266 | /* Consume the token. */ | |
2267 | ||
2268 | start_mark = yaml_parser_get_mark(parser); | |
2269 | FORWARD(parser); | |
2270 | end_mark = yaml_parser_get_mark(parser); | |
2271 | ||
2272 | /* Create the VALUE token. */ | |
2273 | ||
2274 | token = yaml_token_new(YAML_VALUE_TOKEN, start_mark, end_mark); | |
2275 | if (!token) { | |
2276 | parser->error = YAML_MEMORY_ERROR; | |
2277 | return 0; | |
2278 | } | |
2279 | ||
2280 | /* Append the token to the queue. */ | |
2281 | ||
2282 | if (!yaml_parser_append_token(parser, token)) { | |
2283 | yaml_token_delete(token); | |
2284 | return 0; | |
2285 | } | |
2286 | ||
2287 | return 1; | |
2288 | } | |
2289 | ||
2290 | /* | |
2291 | * Produce the ALIAS or ANCHOR token. | |
2292 | */ | |
2293 | ||
2294 | static int | |
2295 | yaml_parser_fetch_anchor(yaml_parser_t *parser, yaml_token_type_t type) | |
2296 | { | |
2297 | yaml_token_t *token; | |
2298 | ||
2299 | /* An anchor or an alias could be a simple key. */ | |
2300 | ||
2301 | if (!yaml_parser_save_simple_key(parser)) | |
2302 | return 0; | |
2303 | ||
2304 | /* A simple key cannot follow an anchor or an alias. */ | |
2305 | ||
2306 | parser->simple_key_allowed = 0; | |
2307 | ||
2308 | /* Create the ALIAS or ANCHOR token. */ | |
2309 | ||
2310 | token = yaml_parser_scan_anchor(parser, type); | |
2311 | if (!token) return 0; | |
2312 | ||
2313 | /* Append the token to the queue. */ | |
2314 | ||
2315 | if (!yaml_parser_append_token(parser, token)) { | |
2316 | yaml_token_delete(token); | |
2317 | return 0; | |
2318 | } | |
2319 | ||
2320 | return 1; | |
2321 | } | |
2322 | ||
2323 | /* | |
2324 | * Produce the TAG token. | |
2325 | */ | |
2326 | ||
2327 | static int | |
2328 | yaml_parser_fetch_tag(yaml_parser_t *parser) | |
2329 | { | |
2330 | yaml_token_t *token; | |
2331 | ||
2332 | /* A tag could be a simple key. */ | |
2333 | ||
2334 | if (!yaml_parser_save_simple_key(parser)) | |
2335 | return 0; | |
2336 | ||
2337 | /* A simple key cannot follow a tag. */ | |
2338 | ||
2339 | parser->simple_key_allowed = 0; | |
2340 | ||
2341 | /* Create the TAG token. */ | |
2342 | ||
2343 | token = yaml_parser_scan_tag(parser); | |
2344 | if (!token) return 0; | |
2345 | ||
2346 | /* Append the token to the queue. */ | |
2347 | ||
2348 | if (!yaml_parser_append_token(parser, token)) { | |
2349 | yaml_token_delete(token); | |
2350 | return 0; | |
2351 | } | |
2352 | ||
2353 | return 1; | |
2354 | } | |
2355 | ||
2356 | /* | |
2357 | * Produce the SCALAR(...,literal) or SCALAR(...,folded) tokens. | |
2358 | */ | |
2359 | ||
2360 | static int | |
2361 | yaml_parser_fetch_block_scalar(yaml_parser_t *parser, int literal) | |
2362 | { | |
2363 | yaml_token_t *token; | |
2364 | ||
2365 | /* Remove any potential simple keys. */ | |
2366 | ||
2367 | if (!yaml_parser_remove_simple_key(parser)) | |
2368 | return 0; | |
2369 | ||
2370 | /* A simple key may follow a block scalar. */ | |
2371 | ||
2372 | parser->simple_key_allowed = 1; | |
2373 | ||
2374 | /* Create the SCALAR token. */ | |
2375 | ||
2376 | token = yaml_parser_scan_block_scalar(parser, literal); | |
2377 | if (!token) return 0; | |
2378 | ||
2379 | /* Append the token to the queue. */ | |
2380 | ||
2381 | if (!yaml_parser_append_token(parser, token)) { | |
2382 | yaml_token_delete(token); | |
2383 | return 0; | |
2384 | } | |
2385 | ||
2386 | return 1; | |
2387 | } | |
2388 | ||
2389 | /* | |
2390 | * Produce the SCALAR(...,single-quoted) or SCALAR(...,double-quoted) tokens. | |
2391 | */ | |
2392 | ||
2393 | static int | |
2394 | yaml_parser_fetch_flow_scalar(yaml_parser_t *parser, int single) | |
2395 | { | |
2396 | yaml_token_t *token; | |
2397 | ||
2398 | /* A plain scalar could be a simple key. */ | |
2399 | ||
2400 | if (!yaml_parser_save_simple_key(parser)) | |
2401 | return 0; | |
2402 | ||
2403 | /* A simple key cannot follow a flow scalar. */ | |
2404 | ||
2405 | parser->simple_key_allowed = 0; | |
2406 | ||
2407 | /* Create the SCALAR token. */ | |
2408 | ||
2409 | token = yaml_parser_scan_flow_scalar(parser, single); | |
2410 | if (!token) return 0; | |
2411 | ||
2412 | /* Append the token to the queue. */ | |
2413 | ||
2414 | if (!yaml_parser_append_token(parser, token)) { | |
2415 | yaml_token_delete(token); | |
2416 | return 0; | |
2417 | } | |
2418 | ||
2419 | return 1; | |
2420 | } | |
2421 | ||
2422 | /* | |
2423 | * Produce the SCALAR(...,plain) token. | |
2424 | */ | |
2425 | ||
2426 | static int | |
2427 | yaml_parser_fetch_plain_scalar(yaml_parser_t *parser) | |
2428 | { | |
2429 | yaml_token_t *token; | |
2430 | ||
2431 | /* A plain scalar could be a simple key. */ | |
2432 | ||
2433 | if (!yaml_parser_save_simple_key(parser)) | |
2434 | return 0; | |
2435 | ||
2436 | /* A simple key cannot follow a flow scalar. */ | |
2437 | ||
2438 | parser->simple_key_allowed = 0; | |
2439 | ||
2440 | /* Create the SCALAR token. */ | |
2441 | ||
2442 | token = yaml_parser_scan_plain_scalar(parser); | |
2443 | if (!token) return 0; | |
2444 | ||
2445 | /* Append the token to the queue. */ | |
2446 | ||
2447 | if (!yaml_parser_append_token(parser, token)) { | |
2448 | yaml_token_delete(token); | |
2449 | return 0; | |
2450 | } | |
2451 | ||
2452 | return 1; | |
2453 | } | |
2454 | ||
e71095e3 KS |
2455 | /* |
2456 | * Eat whitespaces and comments until the next token is found. | |
2457 | */ | |
2458 | ||
2459 | static int | |
2460 | yaml_parser_scan_to_next_token(yaml_parser_t *parser) | |
2461 | { | |
2462 | /* Until the next token is not found. */ | |
2463 | ||
2464 | while (1) | |
2465 | { | |
2466 | /* Allow the BOM mark to start a line. */ | |
2467 | ||
2468 | if (!UPDATE(parser, 1)) return 0; | |
2469 | ||
2470 | if (parser->column == 0 && IS_BOM(parser)) | |
2471 | FORWARD(parser); | |
2472 | ||
2473 | /* | |
2474 | * Eat whitespaces. | |
2475 | * | |
2476 | * Tabs are allowed: | |
2477 | * | |
2478 | * - in the flow context; | |
2479 | * - in the block context, but not at the beginning of the line or | |
2480 | * after '-', '?', or ':' (complex value). | |
2481 | */ | |
2482 | ||
2483 | if (!UPDATE(parser, 1)) return 0; | |
2484 | ||
2485 | while (CHECK(parser,' ') || | |
2486 | ((parser->flow_level || !parser->simple_key_allowed) && | |
2487 | CHECK(parser, '\t'))) { | |
2488 | FORWARD(parser); | |
2489 | if (!UPDATE(parser, 1)) return 0; | |
2490 | } | |
2491 | ||
2492 | /* Eat a comment until a line break. */ | |
2493 | ||
2494 | if (CHECK(parser, '#')) { | |
2495 | while (!IS_BREAKZ(parser)) { | |
2496 | FORWARD(parser); | |
2497 | if (!UPDATE(parser, 1)) return 0; | |
2498 | } | |
2499 | } | |
2500 | ||
2501 | /* If it is a line break, eat it. */ | |
2502 | ||
2503 | if (IS_BREAK(parser)) | |
2504 | { | |
2505 | if (!UPDATE(parser, 2)) return 0; | |
2506 | FORWARD_LINE(parser); | |
2507 | ||
2508 | /* In the block context, a new line may start a simple key. */ | |
2509 | ||
2510 | if (!parser->flow_level) { | |
2511 | parser->simple_key_allowed = 1; | |
2512 | } | |
2513 | } | |
2514 | else | |
2515 | { | |
2516 | /* We have found a token. */ | |
2517 | ||
2518 | break; | |
2519 | } | |
2520 | } | |
2521 | ||
2522 | return 1; | |
2523 | } | |
2524 | ||
2525 | /* | |
2526 | * Scan a YAML-DIRECTIVE or TAG-DIRECTIVE token. | |
2527 | * | |
2528 | * Scope: | |
2529 | * %YAML 1.1 # a comment \n | |
2530 | * ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | |
2531 | * %TAG !yaml! tag:yaml.org,2002: \n | |
2532 | * ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | |
2533 | */ | |
2534 | ||
2535 | static yaml_token_t * | |
2536 | yaml_parser_scan_directive(yaml_parser_t *parser) | |
2537 | { | |
2538 | yaml_mark_t start_mark, end_mark; | |
2539 | yaml_char_t *name = NULL; | |
2540 | int major, minor; | |
2541 | yaml_char_t *handle = NULL, *prefix = NULL; | |
2542 | yaml_token_t *token = NULL; | |
2543 | ||
2544 | /* Eat '%'. */ | |
2545 | ||
2546 | start_mark = yaml_parser_get_mark(parser); | |
2547 | ||
2548 | FORWARD(parser); | |
2549 | ||
2550 | /* Scan the directive name. */ | |
2551 | ||
2552 | if (!yaml_parser_scan_directive_name(parser, start_mark, &name)) | |
2553 | goto error; | |
2554 | ||
2555 | /* Is it a YAML directive? */ | |
2556 | ||
2557 | if (strcmp((char *)name, "YAML") == 0) | |
2558 | { | |
2559 | /* Scan the VERSION directive value. */ | |
2560 | ||
2561 | if (!yaml_parser_scan_version_directive_value(parser, start_mark, | |
2562 | &major, &minor)) | |
2563 | goto error; | |
2564 | ||
2565 | end_mark = yaml_parser_get_mark(parser); | |
2566 | ||
2567 | /* Create a VERSION-DIRECTIVE token. */ | |
2568 | ||
2569 | token = yaml_version_directive_token_new(major, minor, | |
2570 | start_mark, end_mark); | |
92d41fe1 KS |
2571 | if (!token) { |
2572 | parser->error = YAML_MEMORY_ERROR; | |
2573 | return 0; | |
2574 | } | |
e71095e3 KS |
2575 | } |
2576 | ||
2577 | /* Is it a TAG directive? */ | |
2578 | ||
2579 | else if (strcmp((char *)name, "TAG") == 0) | |
2580 | { | |
2581 | /* Scan the TAG directive value. */ | |
2582 | ||
2583 | if (!yaml_parser_scan_tag_directive_value(parser, start_mark, | |
2584 | &handle, &prefix)) | |
2585 | goto error; | |
2586 | ||
2587 | end_mark = yaml_parser_get_mark(parser); | |
2588 | ||
2589 | /* Create a TAG-DIRECTIVE token. */ | |
2590 | ||
2591 | token = yaml_tag_directive_token_new(handle, prefix, | |
2592 | start_mark, end_mark); | |
92d41fe1 KS |
2593 | if (!token) { |
2594 | parser->error = YAML_MEMORY_ERROR; | |
2595 | return 0; | |
2596 | } | |
e71095e3 KS |
2597 | } |
2598 | ||
2599 | /* Unknown directive. */ | |
2600 | ||
2601 | else | |
2602 | { | |
92d41fe1 | 2603 | yaml_parser_set_scanner_error(parser, "while scanning a directive", |
e71095e3 KS |
2604 | start_mark, "found uknown directive name"); |
2605 | goto error; | |
2606 | } | |
2607 | ||
2608 | /* Eat the rest of the line including any comments. */ | |
2609 | ||
2610 | while (IS_BLANK(parser)) { | |
2611 | FORWARD(parser); | |
2612 | if (!UPDATE(parser, 1)) goto error; | |
2613 | } | |
2614 | ||
2615 | if (CHECK(parser, '#')) { | |
2616 | while (!IS_BREAKZ(parser)) { | |
2617 | FORWARD(parser); | |
2618 | if (!UPDATE(parser, 1)) goto error; | |
2619 | } | |
2620 | } | |
2621 | ||
2622 | /* Check if we are at the end of the line. */ | |
2623 | ||
2624 | if (!IS_BREAKZ(parser)) { | |
92d41fe1 | 2625 | yaml_parser_set_scanner_error(parser, "while scanning a directive", |
e71095e3 KS |
2626 | start_mark, "did not found expected comment or line break"); |
2627 | goto error; | |
2628 | } | |
2629 | ||
2630 | /* Eat a line break. */ | |
2631 | ||
2632 | if (IS_BREAK(parser)) { | |
2633 | if (!UPDATE(parser, 2)) goto error; | |
2634 | FORWARD_LINE(parser); | |
2635 | } | |
2636 | ||
2637 | yaml_free(name); | |
2638 | ||
2639 | return token; | |
2640 | ||
2641 | error: | |
2642 | yaml_free(token); | |
2643 | yaml_free(prefix); | |
2644 | yaml_free(handle); | |
2645 | yaml_free(name); | |
2646 | return NULL; | |
2647 | } | |
2648 | ||
2649 | /* | |
2650 | * Scan the directive name. | |
2651 | * | |
2652 | * Scope: | |
2653 | * %YAML 1.1 # a comment \n | |
2654 | * ^^^^ | |
2655 | * %TAG !yaml! tag:yaml.org,2002: \n | |
2656 | * ^^^ | |
2657 | */ | |
2658 | ||
2659 | static int | |
2660 | yaml_parser_scan_directive_name(yaml_parser_t *parser, | |
2661 | yaml_mark_t start_mark, yaml_char_t **name) | |
2662 | { | |
2663 | yaml_string_t string = yaml_parser_new_string(parser); | |
2664 | ||
2665 | if (!string.buffer) goto error; | |
2666 | ||
2667 | /* Consume the directive name. */ | |
2668 | ||
2669 | if (!UPDATE(parser, 1)) goto error; | |
2670 | ||
2671 | while (IS_ALPHA(parser)) | |
2672 | { | |
2673 | if (!RESIZE(parser, string)) goto error; | |
2674 | COPY(parser, string); | |
2675 | if (!UPDATE(parser, 1)) goto error; | |
2676 | } | |
2677 | ||
2678 | /* Check if the name is empty. */ | |
2679 | ||
2680 | if (string.buffer == string.pointer) { | |
2681 | yaml_parser_set_scanner_error(parser, "while scanning a directive", | |
2682 | start_mark, "cannot found expected directive name"); | |
2683 | goto error; | |
2684 | } | |
2685 | ||
2686 | /* Check for an blank character after the name. */ | |
2687 | ||
2688 | if (!IS_BLANKZ(parser)) { | |
2689 | yaml_parser_set_scanner_error(parser, "while scanning a directive", | |
2690 | start_mark, "found unexpected non-alphabetical character"); | |
2691 | goto error; | |
2692 | } | |
2693 | ||
2694 | *name = string.buffer; | |
2695 | ||
2696 | return 1; | |
2697 | ||
2698 | error: | |
2699 | yaml_free(string.buffer); | |
2700 | return 0; | |
2701 | } | |
2702 | ||
2703 | /* | |
2704 | * Scan the value of VERSION-DIRECTIVE. | |
2705 | * | |
2706 | * Scope: | |
2707 | * %YAML 1.1 # a comment \n | |
2708 | * ^^^^^^ | |
2709 | */ | |
2710 | ||
2711 | static int | |
2712 | yaml_parser_scan_version_directive_value(yaml_parser_t *parser, | |
2713 | yaml_mark_t start_mark, int *major, int *minor) | |
2714 | { | |
2715 | /* Eat whitespaces. */ | |
2716 | ||
2717 | if (!UPDATE(parser, 1)) return 0; | |
2718 | ||
2719 | while (IS_BLANK(parser)) { | |
2720 | FORWARD(parser); | |
2721 | if (!UPDATE(parser, 1)) return 0; | |
2722 | } | |
2723 | ||
2724 | /* Consume the major version number. */ | |
2725 | ||
2726 | if (!yaml_parser_scan_version_directive_number(parser, start_mark, major)) | |
2727 | return 0; | |
2728 | ||
2729 | /* Eat '.'. */ | |
2730 | ||
2731 | if (!CHECK(parser, '.')) { | |
2732 | return yaml_parser_set_scanner_error(parser, "while scanning a %YAML directive", | |
2733 | start_mark, "did not find expected digit or '.' character"); | |
2734 | } | |
2735 | ||
2736 | FORWARD(parser); | |
2737 | ||
2738 | /* Consume the minor version number. */ | |
2739 | ||
2740 | if (!yaml_parser_scan_version_directive_number(parser, start_mark, minor)) | |
2741 | return 0; | |
ab01bac8 KS |
2742 | |
2743 | return 1; | |
e71095e3 KS |
2744 | } |
2745 | ||
2746 | #define MAX_NUMBER_LENGTH 9 | |
2747 | ||
2748 | /* | |
2749 | * Scan the version number of VERSION-DIRECTIVE. | |
2750 | * | |
2751 | * Scope: | |
2752 | * %YAML 1.1 # a comment \n | |
2753 | * ^ | |
2754 | * %YAML 1.1 # a comment \n | |
2755 | * ^ | |
2756 | */ | |
2757 | ||
2758 | static int | |
2759 | yaml_parser_scan_version_directive_number(yaml_parser_t *parser, | |
2760 | yaml_mark_t start_mark, int *number) | |
2761 | { | |
2762 | int value = 0; | |
2763 | size_t length = 0; | |
2764 | ||
2765 | /* Repeat while the next character is digit. */ | |
2766 | ||
2767 | if (!UPDATE(parser, 1)) return 0; | |
2768 | ||
2769 | while (IS_DIGIT(parser)) | |
2770 | { | |
2771 | /* Check if the number is too long. */ | |
2772 | ||
2773 | if (++length > MAX_NUMBER_LENGTH) { | |
2774 | return yaml_parser_set_scanner_error(parser, "while scanning a %YAML directive", | |
2775 | start_mark, "found extremely long version number"); | |
2776 | } | |
2777 | ||
2778 | value = value*10 + AS_DIGIT(parser); | |
2779 | ||
2780 | FORWARD(parser); | |
2781 | ||
2782 | if (!UPDATE(parser, 1)) return 0; | |
2783 | } | |
2784 | ||
2785 | /* Check if the number was present. */ | |
2786 | ||
2787 | if (!length) { | |
2788 | return yaml_parser_set_scanner_error(parser, "while scanning a %YAML directive", | |
2789 | start_mark, "did not find expected version number"); | |
2790 | } | |
2791 | ||
2792 | *number = value; | |
2793 | ||
2794 | return 1; | |
2795 | } | |
2796 | ||
2797 | /* | |
2798 | * Scan the value of a TAG-DIRECTIVE token. | |
2799 | * | |
2800 | * Scope: | |
2801 | * %TAG !yaml! tag:yaml.org,2002: \n | |
2802 | * ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | |
2803 | */ | |
2804 | ||
2805 | static int | |
2806 | yaml_parser_scan_tag_directive_value(yaml_parser_t *parser, | |
2807 | yaml_mark_t start_mark, yaml_char_t **handle, yaml_char_t **prefix) | |
2808 | { | |
2809 | yaml_char_t *handle_value = NULL; | |
2810 | yaml_char_t *prefix_value = NULL; | |
2811 | ||
2812 | /* Eat whitespaces. */ | |
2813 | ||
2814 | if (!UPDATE(parser, 1)) goto error; | |
2815 | ||
2816 | while (IS_BLANK(parser)) { | |
2817 | FORWARD(parser); | |
2818 | if (!UPDATE(parser, 1)) goto error; | |
2819 | } | |
2820 | ||
2821 | /* Scan a handle. */ | |
2822 | ||
2823 | if (!yaml_parser_scan_tag_handle(parser, 1, start_mark, &handle_value)) | |
2824 | goto error; | |
2825 | ||
2826 | /* Expect a whitespace. */ | |
2827 | ||
2828 | if (!UPDATE(parser, 1)) goto error; | |
2829 | ||
2830 | if (!IS_BLANK(parser)) { | |
2831 | yaml_parser_set_scanner_error(parser, "while scanning a %TAG directive", | |
2832 | start_mark, "did not find expected whitespace"); | |
2833 | goto error; | |
2834 | } | |
2835 | ||
2836 | /* Eat whitespaces. */ | |
2837 | ||
2838 | while (IS_BLANK(parser)) { | |
2839 | FORWARD(parser); | |
2840 | if (!UPDATE(parser, 1)) goto error; | |
2841 | } | |
2842 | ||
2843 | /* Scan a prefix. */ | |
2844 | ||
2845 | if (!yaml_parser_scan_tag_uri(parser, 1, NULL, start_mark, &prefix_value)) | |
2846 | goto error; | |
2847 | ||
2848 | /* Expect a whitespace or line break. */ | |
2849 | ||
2850 | if (!UPDATE(parser, 1)) goto error; | |
2851 | ||
2852 | if (!IS_BLANKZ(parser)) { | |
2853 | yaml_parser_set_scanner_error(parser, "while scanning a %TAG directive", | |
2854 | start_mark, "did not find expected whitespace or line break"); | |
2855 | goto error; | |
2856 | } | |
2857 | ||
2858 | *handle = handle_value; | |
2859 | *prefix = prefix_value; | |
2860 | ||
2861 | return 1; | |
2862 | ||
2863 | error: | |
2864 | yaml_free(handle_value); | |
2865 | yaml_free(prefix_value); | |
2866 | return 0; | |
2867 | } | |
2868 | ||
2869 | static yaml_token_t * | |
2870 | yaml_parser_scan_anchor(yaml_parser_t *parser, | |
2871 | yaml_token_type_t type) | |
2872 | { | |
2873 | int length = 0; | |
2874 | yaml_mark_t start_mark, end_mark; | |
2875 | yaml_token_t *token = NULL; | |
2876 | yaml_string_t string = yaml_parser_new_string(parser); | |
2877 | ||
2878 | if (!string.buffer) goto error; | |
2879 | ||
2880 | /* Eat the indicator character. */ | |
2881 | ||
2882 | start_mark = yaml_parser_get_mark(parser); | |
2883 | ||
2884 | FORWARD(parser); | |
2885 | ||
2886 | /* Consume the value. */ | |
2887 | ||
2888 | if (!UPDATE(parser, 1)) goto error; | |
2889 | ||
2890 | while (IS_ALPHA(parser)) { | |
2891 | if (!RESIZE(parser, string)) goto error; | |
2892 | COPY(parser, string); | |
2893 | if (!UPDATE(parser, 1)) goto error; | |
2894 | length ++; | |
2895 | } | |
2896 | ||
2897 | end_mark = yaml_parser_get_mark(parser); | |
2898 | ||
2899 | /* | |
2900 | * Check if length of the anchor is greater than 0 and it is followed by | |
2901 | * a whitespace character or one of the indicators: | |
2902 | * | |
2903 | * '?', ':', ',', ']', '}', '%', '@', '`'. | |
2904 | */ | |
2905 | ||
2906 | if (!length || !(IS_BLANKZ(parser) || CHECK(parser, '?') || CHECK(parser, ':') || | |
2907 | CHECK(parser, ',') || CHECK(parser, ']') || CHECK(parser, '}') || | |
2908 | CHECK(parser, '%') || CHECK(parser, '@') || CHECK(parser, '`'))) { | |
2909 | yaml_parser_set_scanner_error(parser, type == YAML_ANCHOR_TOKEN ? | |
2910 | "while scanning an anchor" : "while scanning an alias", start_mark, | |
2911 | "did not find expected alphabetic or numeric character"); | |
2912 | goto error; | |
2913 | } | |
2914 | ||
2915 | /* Create a token. */ | |
2916 | ||
2917 | token = type == YAML_ANCHOR_TOKEN ? | |
2918 | yaml_anchor_token_new(string.buffer, start_mark, end_mark) : | |
2919 | yaml_alias_token_new(string.buffer, start_mark, end_mark); | |
92d41fe1 KS |
2920 | if (!token) { |
2921 | parser->error = YAML_MEMORY_ERROR; | |
2922 | return 0; | |
2923 | } | |
e71095e3 KS |
2924 | |
2925 | return token; | |
2926 | ||
2927 | error: | |
2928 | yaml_free(string.buffer); | |
2929 | yaml_free(token); | |
2930 | return 0; | |
2931 | } | |
2932 | ||
2933 | /* | |
2934 | * Scan a TAG token. | |
2935 | */ | |
2936 | ||
2937 | static yaml_token_t * | |
2938 | yaml_parser_scan_tag(yaml_parser_t *parser) | |
2939 | { | |
2940 | yaml_char_t *handle = NULL; | |
2941 | yaml_char_t *suffix = NULL; | |
2942 | yaml_token_t *token = NULL; | |
2943 | yaml_mark_t start_mark, end_mark; | |
2944 | ||
2945 | start_mark = yaml_parser_get_mark(parser); | |
2946 | ||
2947 | /* Check if the tag is in the canonical form. */ | |
2948 | ||
2949 | if (!UPDATE(parser, 2)) goto error; | |
2950 | ||
2951 | if (CHECK_AT(parser, '<', 1)) | |
2952 | { | |
2953 | /* Set the handle to '' */ | |
2954 | ||
2955 | handle = yaml_malloc(1); | |
2956 | if (!handle) goto error; | |
2957 | handle[0] = '\0'; | |
2958 | ||
2959 | /* Eat '!<' */ | |
2960 | ||
2961 | FORWARD(parser); | |
2962 | FORWARD(parser); | |
2963 | ||
2964 | /* Consume the tag value. */ | |
2965 | ||
2966 | if (!yaml_parser_scan_tag_uri(parser, 0, NULL, start_mark, &suffix)) | |
2967 | goto error; | |
2968 | ||
2969 | /* Check for '>' and eat it. */ | |
2970 | ||
2971 | if (!CHECK(parser, '>')) { | |
2972 | yaml_parser_set_scanner_error(parser, "while scanning a tag", | |
2973 | start_mark, "did not find the expected '>'"); | |
2974 | goto error; | |
2975 | } | |
2976 | ||
2977 | FORWARD(parser); | |
2978 | } | |
2979 | else | |
2980 | { | |
2981 | /* The tag has either the '!suffix' or the '!handle!suffix' form. */ | |
2982 | ||
2983 | /* First, try to scan a handle. */ | |
2984 | ||
2985 | if (!yaml_parser_scan_tag_handle(parser, 0, start_mark, &handle)) | |
2986 | goto error; | |
2987 | ||
2988 | /* Check if it is, indeed, handle. */ | |
2989 | ||
2990 | if (handle[0] == '!' && handle[1] != '\0' && handle[strlen((char *)handle)-1] == '!') | |
2991 | { | |
2992 | /* Scan the suffix now. */ | |
2993 | ||
2994 | if (!yaml_parser_scan_tag_uri(parser, 0, NULL, start_mark, &suffix)) | |
2995 | goto error; | |
2996 | } | |
2997 | else | |
2998 | { | |
2999 | /* It wasn't a handle after all. Scan the rest of the tag. */ | |
3000 | ||
3001 | if (!yaml_parser_scan_tag_uri(parser, 0, handle, start_mark, &suffix)) | |
3002 | goto error; | |
3003 | ||
3004 | /* Set the handle to '!'. */ | |
3005 | ||
3006 | yaml_free(handle); | |
3007 | handle = yaml_malloc(2); | |
3008 | if (!handle) goto error; | |
3009 | handle[0] = '!'; | |
3010 | handle[1] = '\0'; | |
7e32c194 KS |
3011 | |
3012 | /* | |
3013 | * A special case: the '!' tag. | |
3014 | */ | |
3015 | ||
3016 | if (suffix[0] == '\0') { | |
3017 | yaml_char_t *tmp = handle; | |
3018 | handle = suffix; | |
3019 | suffix = tmp; | |
3020 | } | |
e71095e3 KS |
3021 | } |
3022 | } | |
3023 | ||
3024 | /* Check the character which ends the tag. */ | |
3025 | ||
3026 | if (!UPDATE(parser, 1)) goto error; | |
3027 | ||
3028 | if (!IS_BLANKZ(parser)) { | |
3029 | yaml_parser_set_scanner_error(parser, "while scanning a tag", | |
3030 | start_mark, "did not found expected whitespace or line break"); | |
3031 | goto error; | |
3032 | } | |
3033 | ||
3034 | end_mark = yaml_parser_get_mark(parser); | |
3035 | ||
3036 | /* Create a token. */ | |
3037 | ||
3038 | token = yaml_tag_token_new(handle, suffix, start_mark, end_mark); | |
92d41fe1 KS |
3039 | if (!token) { |
3040 | parser->error = YAML_MEMORY_ERROR; | |
3041 | return 0; | |
3042 | } | |
e71095e3 KS |
3043 | |
3044 | return token; | |
3045 | ||
3046 | error: | |
3047 | yaml_free(handle); | |
3048 | yaml_free(suffix); | |
3049 | return NULL; | |
3050 | } | |
3051 | ||
3052 | /* | |
3053 | * Scan a tag handle. | |
3054 | */ | |
3055 | ||
3056 | static int | |
3057 | yaml_parser_scan_tag_handle(yaml_parser_t *parser, int directive, | |
3058 | yaml_mark_t start_mark, yaml_char_t **handle) | |
3059 | { | |
3060 | yaml_string_t string = yaml_parser_new_string(parser); | |
3061 | ||
3062 | if (!string.buffer) goto error; | |
3063 | ||
3064 | /* Check the initial '!' character. */ | |
3065 | ||
3066 | if (!UPDATE(parser, 1)) goto error; | |
3067 | ||
3068 | if (!CHECK(parser, '!')) { | |
3069 | yaml_parser_set_scanner_error(parser, directive ? | |
3070 | "while scanning a tag directive" : "while scanning a tag", | |
3071 | start_mark, "did not find expected '!'"); | |
3072 | goto error; | |
3073 | } | |
3074 | ||
3075 | /* Copy the '!' character. */ | |
3076 | ||
3077 | COPY(parser, string); | |
3078 | ||
3079 | /* Copy all subsequent alphabetical and numerical characters. */ | |
3080 | ||
3081 | if (!UPDATE(parser, 1)) goto error; | |
3082 | ||
3083 | while (IS_ALPHA(parser)) | |
3084 | { | |
3085 | if (!RESIZE(parser, string)) goto error; | |
3086 | COPY(parser, string); | |
3087 | if (!UPDATE(parser, 1)) goto error; | |
3088 | } | |
3089 | ||
3090 | /* Check if the trailing character is '!' and copy it. */ | |
3091 | ||
3092 | if (CHECK(parser, '!')) | |
3093 | { | |
3094 | if (!RESIZE(parser, string)) goto error; | |
3095 | COPY(parser, string); | |
3096 | } | |
3097 | else | |
3098 | { | |
3099 | /* | |
7e32c194 KS |
3100 | * It's either the '!' tag or not really a tag handle. If it's a %TAG |
3101 | * directive, it's an error. If it's a tag token, it must be a part of | |
3102 | * URI. | |
e71095e3 KS |
3103 | */ |
3104 | ||
7e32c194 KS |
3105 | if (directive && !(string.buffer[0] == '!' && string.buffer[1] == '\0')) { |
3106 | yaml_parser_set_scanner_error(parser, "while parsing a tag directive", | |
e71095e3 KS |
3107 | start_mark, "did not find expected '!'"); |
3108 | goto error; | |
3109 | } | |
3110 | } | |
3111 | ||
3112 | *handle = string.buffer; | |
3113 | ||
3114 | return 1; | |
3115 | ||
3116 | error: | |
3117 | yaml_free(string.buffer); | |
3118 | return 0; | |
3119 | } | |
3120 | ||
3121 | /* | |
3122 | * Scan a tag. | |
3123 | */ | |
3124 | ||
3125 | static int | |
3126 | yaml_parser_scan_tag_uri(yaml_parser_t *parser, int directive, | |
3127 | yaml_char_t *head, yaml_mark_t start_mark, yaml_char_t **uri) | |
3128 | { | |
3129 | size_t length = head ? strlen((char *)head) : 0; | |
3130 | yaml_string_t string = yaml_parser_new_string(parser); | |
3131 | ||
3132 | if (!string.buffer) goto error; | |
3133 | ||
3134 | /* Resize the string to include the head. */ | |
3135 | ||
3136 | while (string.size <= length) { | |
3137 | if (!yaml_parser_resize_string(parser, &string)) goto error; | |
3138 | } | |
3139 | ||
7e32c194 KS |
3140 | /* |
3141 | * Copy the head if needed. | |
3142 | * | |
3143 | * Note that we don't copy the leading '!' character. | |
3144 | */ | |
e71095e3 | 3145 | |
7e32c194 KS |
3146 | if (length > 1) { |
3147 | memcpy(string.buffer, head+1, length-1); | |
3148 | string.pointer += length-1; | |
e71095e3 KS |
3149 | } |
3150 | ||
3151 | /* Scan the tag. */ | |
3152 | ||
3153 | if (!UPDATE(parser, 1)) goto error; | |
3154 | ||
3155 | /* | |
3156 | * The set of characters that may appear in URI is as follows: | |
3157 | * | |
3158 | * '0'-'9', 'A'-'Z', 'a'-'z', '_', '-', ';', '/', '?', ':', '@', '&', | |
3159 | * '=', '+', '$', ',', '.', '!', '~', '*', '\'', '(', ')', '[', ']', | |
3160 | * '%'. | |
3161 | */ | |
3162 | ||
3163 | while (IS_ALPHA(parser) || CHECK(parser, ';') || CHECK(parser, '/') || | |
3164 | CHECK(parser, '?') || CHECK(parser, ':') || CHECK(parser, '@') || | |
3165 | CHECK(parser, '&') || CHECK(parser, '=') || CHECK(parser, '+') || | |
3166 | CHECK(parser, '$') || CHECK(parser, ',') || CHECK(parser, '.') || | |
3167 | CHECK(parser, '!') || CHECK(parser, '~') || CHECK(parser, '*') || | |
3168 | CHECK(parser, '\'') || CHECK(parser, '(') || CHECK(parser, ')') || | |
3169 | CHECK(parser, '[') || CHECK(parser, ']') || CHECK(parser, '%')) | |
3170 | { | |
3171 | if (!RESIZE(parser, string)) goto error; | |
3172 | ||
3173 | /* Check if it is a URI-escape sequence. */ | |
3174 | ||
3175 | if (CHECK(parser, '%')) { | |
3176 | if (!yaml_parser_scan_uri_escapes(parser, | |
3177 | directive, start_mark, &string)) goto error; | |
3178 | } | |
3179 | else { | |
3180 | COPY(parser, string); | |
3181 | } | |
3182 | ||
3183 | length ++; | |
3184 | if (!UPDATE(parser, 1)) goto error; | |
3185 | } | |
3186 | ||
3187 | /* Check if the tag is non-empty. */ | |
3188 | ||
3189 | if (!length) { | |
3190 | yaml_parser_set_scanner_error(parser, directive ? | |
3191 | "while parsing a %TAG directive" : "while parsing a tag", | |
3192 | start_mark, "did not find expected tag URI"); | |
3193 | goto error; | |
3194 | } | |
3195 | ||
3196 | *uri = string.buffer; | |
3197 | ||
3198 | return 1; | |
3199 | ||
3200 | error: | |
3201 | yaml_free(string.buffer); | |
3202 | return 0; | |
3203 | } | |
3204 | ||
3205 | /* | |
3206 | * Decode an URI-escape sequence corresponding to a single UTF-8 character. | |
3207 | */ | |
3208 | ||
3209 | static int | |
3210 | yaml_parser_scan_uri_escapes(yaml_parser_t *parser, int directive, | |
3211 | yaml_mark_t start_mark, yaml_string_t *string) | |
3212 | { | |
3213 | int width = 0; | |
3214 | ||
3215 | /* Decode the required number of characters. */ | |
3216 | ||
3217 | do { | |
3218 | ||
3219 | unsigned char octet = 0; | |
3220 | ||
3221 | /* Check for a URI-escaped octet. */ | |
3222 | ||
3223 | if (!UPDATE(parser, 3)) return 0; | |
3224 | ||
3225 | if (!(CHECK(parser, '%') && IS_HEX_AT(parser, 1) && IS_HEX_AT(parser, 2))) { | |
3226 | return yaml_parser_set_scanner_error(parser, directive ? | |
3227 | "while parsing a %TAG directive" : "while parsing a tag", | |
3228 | start_mark, "did not find URI escaped octet"); | |
3229 | } | |
3230 | ||
3231 | /* Get the octet. */ | |
3232 | ||
3233 | octet = (AS_HEX_AT(parser, 1) << 4) + AS_HEX_AT(parser, 2); | |
3234 | ||
3235 | /* If it is the leading octet, determine the length of the UTF-8 sequence. */ | |
3236 | ||
3237 | if (!width) | |
3238 | { | |
3239 | width = (octet & 0x80) == 0x00 ? 1 : | |
3240 | (octet & 0xE0) == 0xC0 ? 2 : | |
3241 | (octet & 0xF0) == 0xE0 ? 3 : | |
3242 | (octet & 0xF8) == 0xF0 ? 4 : 0; | |
3243 | if (!width) { | |
3244 | return yaml_parser_set_scanner_error(parser, directive ? | |
3245 | "while parsing a %TAG directive" : "while parsing a tag", | |
3246 | start_mark, "found an incorrect leading UTF-8 octet"); | |
3247 | } | |
3248 | } | |
3249 | else | |
3250 | { | |
3251 | /* Check if the trailing octet is correct. */ | |
3252 | ||
3253 | if ((octet & 0xC0) != 0x80) { | |
3254 | return yaml_parser_set_scanner_error(parser, directive ? | |
3255 | "while parsing a %TAG directive" : "while parsing a tag", | |
3256 | start_mark, "found an incorrect trailing UTF-8 octet"); | |
3257 | } | |
3258 | } | |
3259 | ||
3260 | /* Copy the octet and move the pointers. */ | |
3261 | ||
3262 | *(string->pointer++) = octet; | |
3263 | FORWARD(parser); | |
3264 | FORWARD(parser); | |
3265 | FORWARD(parser); | |
3266 | ||
3267 | } while (--width); | |
3268 | ||
3269 | return 1; | |
3270 | } | |
3271 | ||
92d41fe1 KS |
3272 | /* |
3273 | * Scan a block scalar. | |
3274 | */ | |
3275 | ||
3276 | static yaml_token_t * | |
3277 | yaml_parser_scan_block_scalar(yaml_parser_t *parser, int literal) | |
3278 | { | |
3279 | yaml_mark_t start_mark; | |
3280 | yaml_mark_t end_mark; | |
3281 | yaml_string_t string = yaml_parser_new_string(parser); | |
21fbedd4 KS |
3282 | yaml_string_t leading_break = yaml_parser_new_string(parser); |
3283 | yaml_string_t trailing_breaks = yaml_parser_new_string(parser); | |
92d41fe1 KS |
3284 | yaml_token_t *token = NULL; |
3285 | int chomping = 0; | |
3286 | int increment = 0; | |
3287 | int indent = 0; | |
3288 | int leading_blank = 0; | |
3289 | int trailing_blank = 0; | |
3290 | ||
3291 | if (!string.buffer) goto error; | |
21fbedd4 KS |
3292 | if (!leading_break.buffer) goto error; |
3293 | if (!trailing_breaks.buffer) goto error; | |
92d41fe1 KS |
3294 | |
3295 | /* Eat the indicator '|' or '>'. */ | |
3296 | ||
3297 | start_mark = yaml_parser_get_mark(parser); | |
3298 | ||
3299 | FORWARD(parser); | |
3300 | ||
3301 | /* Scan the additional block scalar indicators. */ | |
3302 | ||
3303 | if (!UPDATE(parser, 1)) goto error; | |
3304 | ||
3305 | /* Check for a chomping indicator. */ | |
3306 | ||
3307 | if (CHECK(parser, '+') || CHECK(parser, '-')) | |
3308 | { | |
3309 | /* Set the chomping method and eat the indicator. */ | |
3310 | ||
3311 | chomping = CHECK(parser, '+') ? +1 : -1; | |
3312 | ||
3313 | FORWARD(parser); | |
3314 | ||
3315 | /* Check for an indentation indicator. */ | |
3316 | ||
3317 | if (!UPDATE(parser, 1)) goto error; | |
3318 | ||
3319 | if (IS_DIGIT(parser)) | |
3320 | { | |
3321 | /* Check that the intendation is greater than 0. */ | |
3322 | ||
3323 | if (CHECK(parser, '0')) { | |
3324 | yaml_parser_set_scanner_error(parser, "while scanning a block scalar", | |
3325 | start_mark, "found an intendation indicator equal to 0"); | |
3326 | goto error; | |
3327 | } | |
3328 | ||
3329 | /* Get the intendation level and eat the indicator. */ | |
3330 | ||
3331 | increment = AS_DIGIT(parser); | |
3332 | ||
3333 | FORWARD(parser); | |
3334 | } | |
3335 | } | |
3336 | ||
3337 | /* Do the same as above, but in the opposite order. */ | |
3338 | ||
3339 | else if (IS_DIGIT(parser)) | |
3340 | { | |
3341 | if (CHECK(parser, '0')) { | |
3342 | yaml_parser_set_scanner_error(parser, "while scanning a block scalar", | |
3343 | start_mark, "found an intendation indicator equal to 0"); | |
3344 | goto error; | |
3345 | } | |
3346 | ||
3347 | increment = AS_DIGIT(parser); | |
3348 | ||
3349 | FORWARD(parser); | |
3350 | ||
3351 | if (!UPDATE(parser, 1)) goto error; | |
3352 | ||
3353 | if (CHECK(parser, '+') || CHECK(parser, '-')) { | |
3354 | chomping = CHECK(parser, '+') ? +1 : -1; | |
3355 | FORWARD(parser); | |
3356 | } | |
3357 | } | |
3358 | ||
3359 | /* Eat whitespaces and comments to the end of the line. */ | |
3360 | ||
3361 | if (!UPDATE(parser, 1)) goto error; | |
3362 | ||
3363 | while (IS_BLANK(parser)) { | |
3364 | FORWARD(parser); | |
3365 | if (!UPDATE(parser, 1)) goto error; | |
3366 | } | |
3367 | ||
3368 | if (CHECK(parser, '#')) { | |
3369 | while (!IS_BREAKZ(parser)) { | |
3370 | FORWARD(parser); | |
3371 | if (!UPDATE(parser, 1)) goto error; | |
3372 | } | |
3373 | } | |
3374 | ||
3375 | /* Check if we are at the end of the line. */ | |
3376 | ||
3377 | if (!IS_BREAKZ(parser)) { | |
3378 | yaml_parser_set_scanner_error(parser, "while scanning a block scalar", | |
3379 | start_mark, "did not found expected comment or line break"); | |
3380 | goto error; | |
3381 | } | |
3382 | ||
3383 | /* Eat a line break. */ | |
3384 | ||
3385 | if (IS_BREAK(parser)) { | |
3386 | if (!UPDATE(parser, 2)) goto error; | |
3387 | FORWARD_LINE(parser); | |
3388 | } | |
3389 | ||
3390 | end_mark = yaml_parser_get_mark(parser); | |
3391 | ||
3392 | /* Set the intendation level if it was specified. */ | |
3393 | ||
3394 | if (increment) { | |
3395 | indent = parser->indent >= 0 ? parser->indent+increment : increment; | |
3396 | } | |
3397 | ||
3398 | /* Scan the leading line breaks and determine the indentation level if needed. */ | |
3399 | ||
21fbedd4 | 3400 | if (!yaml_parser_scan_block_scalar_breaks(parser, &indent, &trailing_breaks, |
92d41fe1 KS |
3401 | start_mark, &end_mark)) goto error; |
3402 | ||
3403 | /* Scan the block scalar content. */ | |
3404 | ||
3405 | if (!UPDATE(parser, 1)) goto error; | |
3406 | ||
3407 | while (parser->column == indent && !IS_Z(parser)) | |
3408 | { | |
3409 | /* | |
3410 | * We are at the beginning of a non-empty line. | |
3411 | */ | |
3412 | ||
3413 | /* Is it a trailing whitespace? */ | |
3414 | ||
3415 | trailing_blank = IS_BLANK(parser); | |
3416 | ||
3417 | /* Check if we need to fold the leading line break. */ | |
3418 | ||
21fbedd4 | 3419 | if (!literal && (*leading_break.buffer == '\n') |
92d41fe1 KS |
3420 | && !leading_blank && !trailing_blank) |
3421 | { | |
3422 | /* Do we need to join the lines by space? */ | |
3423 | ||
21fbedd4 | 3424 | if (*trailing_breaks.buffer == '\0') { |
92d41fe1 KS |
3425 | if (!RESIZE(parser, string)) goto error; |
3426 | *(string.pointer ++) = ' '; | |
3427 | } | |
3428 | ||
21fbedd4 | 3429 | yaml_parser_clear_string(parser, &leading_break); |
92d41fe1 KS |
3430 | } |
3431 | else { | |
21fbedd4 | 3432 | if (!JOIN(parser, string, leading_break)) goto error; |
92d41fe1 KS |
3433 | } |
3434 | ||
3435 | /* Append the remaining line breaks. */ | |
3436 | ||
21fbedd4 | 3437 | if (!JOIN(parser, string, trailing_breaks)) goto error; |
92d41fe1 KS |
3438 | |
3439 | /* Is it a leading whitespace? */ | |
3440 | ||
3441 | leading_blank = IS_BLANK(parser); | |
3442 | ||
3443 | /* Consume the current line. */ | |
3444 | ||
3445 | while (!IS_BREAKZ(parser)) { | |
3446 | if (!RESIZE(parser, string)) goto error; | |
3447 | COPY(parser, string); | |
3448 | if (!UPDATE(parser, 1)) goto error; | |
3449 | } | |
3450 | ||
3451 | /* Consume the line break. */ | |
3452 | ||
3453 | if (!UPDATE(parser, 2)) goto error; | |
3454 | ||
21fbedd4 | 3455 | COPY_LINE(parser, leading_break); |
92d41fe1 KS |
3456 | |
3457 | /* Eat the following intendation spaces and line breaks. */ | |
3458 | ||
3459 | if (!yaml_parser_scan_block_scalar_breaks(parser, | |
21fbedd4 | 3460 | &indent, &trailing_breaks, start_mark, &end_mark)) goto error; |
92d41fe1 KS |
3461 | } |
3462 | ||
3463 | /* Chomp the tail. */ | |
3464 | ||
3465 | if (chomping != -1) { | |
21fbedd4 | 3466 | if (!JOIN(parser, string, leading_break)) goto error; |
92d41fe1 KS |
3467 | } |
3468 | if (chomping == 1) { | |
21fbedd4 | 3469 | if (!JOIN(parser, string, trailing_breaks)) goto error; |
92d41fe1 KS |
3470 | } |
3471 | ||
3472 | /* Create a token. */ | |
3473 | ||
3474 | token = yaml_scalar_token_new(string.buffer, string.pointer-string.buffer, | |
3475 | literal ? YAML_LITERAL_SCALAR_STYLE : YAML_FOLDED_SCALAR_STYLE, | |
3476 | start_mark, end_mark); | |
3477 | if (!token) { | |
3478 | parser->error = YAML_MEMORY_ERROR; | |
3479 | return 0; | |
3480 | } | |
3481 | ||
21fbedd4 KS |
3482 | yaml_free(leading_break.buffer); |
3483 | yaml_free(trailing_breaks.buffer); | |
92d41fe1 KS |
3484 | |
3485 | return token; | |
3486 | ||
3487 | error: | |
3488 | yaml_free(string.buffer); | |
21fbedd4 KS |
3489 | yaml_free(leading_break.buffer); |
3490 | yaml_free(trailing_breaks.buffer); | |
92d41fe1 KS |
3491 | |
3492 | return NULL; | |
3493 | } | |
3494 | ||
3495 | /* | |
3496 | * Scan intendation spaces and line breaks for a block scalar. Determine the | |
3497 | * intendation level if needed. | |
3498 | */ | |
3499 | ||
3500 | static int | |
3501 | yaml_parser_scan_block_scalar_breaks(yaml_parser_t *parser, | |
3502 | int *indent, yaml_string_t *breaks, | |
3503 | yaml_mark_t start_mark, yaml_mark_t *end_mark) | |
3504 | { | |
3505 | int max_indent = 0; | |
3506 | ||
3507 | *end_mark = yaml_parser_get_mark(parser); | |
3508 | ||
3509 | /* Eat the intendation spaces and line breaks. */ | |
3510 | ||
3511 | while (1) | |
3512 | { | |
3513 | /* Eat the intendation spaces. */ | |
3514 | ||
3515 | if (!UPDATE(parser, 1)) return 0; | |
3516 | ||
3517 | while ((!*indent || parser->column < *indent) && IS_SPACE(parser)) { | |
3518 | FORWARD(parser); | |
3519 | if (!UPDATE(parser, 1)) return 0; | |
3520 | } | |
3521 | ||
3522 | if (parser->column > max_indent) | |
3523 | max_indent = parser->column; | |
3524 | ||
3525 | /* Check for a tab character messing the intendation. */ | |
3526 | ||
3527 | if ((!*indent || parser->column < *indent) && IS_TAB(parser)) { | |
3528 | return yaml_parser_set_scanner_error(parser, "while scanning a block scalar", | |
3529 | start_mark, "found a tab character where an intendation space is expected"); | |
3530 | } | |
3531 | ||
3532 | /* Have we found a non-empty line? */ | |
3533 | ||
3534 | if (!IS_BREAK(parser)) break; | |
3535 | ||
3536 | /* Consume the line break. */ | |
3537 | ||
3538 | if (!UPDATE(parser, 2)) return 0; | |
3539 | if (!RESIZE(parser, *breaks)) return 0; | |
3540 | COPY_LINE(parser, *breaks); | |
3541 | *end_mark = yaml_parser_get_mark(parser); | |
3542 | } | |
3543 | ||
3544 | /* Determine the indentation level if needed. */ | |
3545 | ||
3546 | if (!*indent) { | |
3547 | *indent = max_indent; | |
3548 | if (*indent < parser->indent + 1) | |
3549 | *indent = parser->indent + 1; | |
3550 | if (*indent < 1) | |
3551 | *indent = 1; | |
3552 | } | |
3553 | ||
3554 | return 1; | |
3555 | } | |
3556 | ||
21fbedd4 KS |
3557 | /* |
3558 | * Scan a quoted scalar. | |
3559 | */ | |
3560 | ||
3561 | static yaml_token_t * | |
3562 | yaml_parser_scan_flow_scalar(yaml_parser_t *parser, int single) | |
3563 | { | |
3564 | yaml_mark_t start_mark; | |
3565 | yaml_mark_t end_mark; | |
3566 | yaml_string_t string = yaml_parser_new_string(parser); | |
3567 | yaml_string_t leading_break = yaml_parser_new_string(parser); | |
3568 | yaml_string_t trailing_breaks = yaml_parser_new_string(parser); | |
3569 | yaml_string_t whitespaces = yaml_parser_new_string(parser); | |
3570 | yaml_token_t *token = NULL; | |
3571 | int leading_blanks; | |
3572 | ||
3573 | if (!string.buffer) goto error; | |
3574 | if (!leading_break.buffer) goto error; | |
3575 | if (!trailing_breaks.buffer) goto error; | |
3576 | if (!whitespaces.buffer) goto error; | |
3577 | ||
3578 | /* Eat the left quote. */ | |
3579 | ||
3580 | start_mark = yaml_parser_get_mark(parser); | |
3581 | ||
3582 | FORWARD(parser); | |
3583 | ||
3584 | /* Consume the content of the quoted scalar. */ | |
3585 | ||
3586 | while (1) | |
3587 | { | |
3588 | /* Check that there are no document indicators at the beginning of the line. */ | |
3589 | ||
3590 | if (!UPDATE(parser, 4)) goto error; | |
3591 | ||
3592 | if (parser->column == 0 && | |
3593 | ((CHECK_AT(parser, '-', 0) && | |
3594 | CHECK_AT(parser, '-', 1) && | |
3595 | CHECK_AT(parser, '-', 2)) || | |
3596 | (CHECK_AT(parser, '.', 0) && | |
3597 | CHECK_AT(parser, '.', 1) && | |
3598 | CHECK_AT(parser, '.', 2))) && | |
3599 | IS_BLANKZ_AT(parser, 3)) | |
3600 | { | |
3601 | yaml_parser_set_scanner_error(parser, "while scanning a quoted scalar", | |
3602 | start_mark, "found unexpected document indicator"); | |
3603 | goto error; | |
3604 | } | |
3605 | ||
3606 | /* Check for EOF. */ | |
3607 | ||
3608 | if (IS_Z(parser)) { | |
3609 | yaml_parser_set_scanner_error(parser, "while scanning a quoted scalar", | |
3610 | start_mark, "found unexpected end of stream"); | |
3611 | goto error; | |
3612 | } | |
3613 | ||
3614 | /* Consume non-blank characters. */ | |
3615 | ||
3616 | if (!UPDATE(parser, 2)) goto error; | |
3617 | if (!RESIZE(parser, string)) goto error; | |
3618 | ||
3619 | leading_blanks = 0; | |
3620 | ||
3621 | while (!IS_BLANKZ(parser)) | |
3622 | { | |
3623 | /* Check for an escaped single quote. */ | |
3624 | ||
3625 | if (single && CHECK_AT(parser, '\'', 0) && CHECK_AT(parser, '\'', 1)) | |
3626 | { | |
3627 | *(string.pointer++) = '\''; | |
3628 | FORWARD(parser); | |
3629 | FORWARD(parser); | |
3630 | } | |
3631 | ||
3632 | /* Check for the right quote. */ | |
3633 | ||
3634 | else if (CHECK(parser, single ? '\'' : '"')) | |
3635 | { | |
3636 | break; | |
3637 | } | |
3638 | ||
3639 | /* Check for an escaped line break. */ | |
3640 | ||
3641 | else if (!single && CHECK(parser, '\\') && IS_BREAK_AT(parser, 1)) | |
3642 | { | |
3643 | if (!UPDATE(parser, 3)) goto error; | |
3644 | FORWARD(parser); | |
3645 | FORWARD_LINE(parser); | |
3646 | leading_blanks = 1; | |
3647 | break; | |
3648 | } | |
3649 | ||
3650 | /* Check for an escape sequence. */ | |
3651 | ||
3652 | else if (!single && CHECK(parser, '\\')) | |
3653 | { | |
3654 | int code_length = 0; | |
3655 | ||
3656 | /* Check the escape character. */ | |
3657 | ||
3658 | switch (parser->pointer[1]) | |
3659 | { | |
3660 | case '0': | |
3661 | *(string.pointer++) = '\0'; | |
3662 | break; | |
3663 | ||
3664 | case 'a': | |
3665 | *(string.pointer++) = '\x07'; | |
3666 | break; | |
3667 | ||
3668 | case 'b': | |
3669 | *(string.pointer++) = '\x08'; | |
3670 | break; | |
3671 | ||
3672 | case 't': | |
3673 | case '\t': | |
3674 | *(string.pointer++) = '\x09'; | |
3675 | break; | |
3676 | ||
3677 | case 'n': | |
3678 | *(string.pointer++) = '\x0A'; | |
3679 | break; | |
3680 | ||
3681 | case 'v': | |
3682 | *(string.pointer++) = '\x0B'; | |
3683 | break; | |
3684 | ||
3685 | case 'f': | |
3686 | *(string.pointer++) = '\x0C'; | |
3687 | break; | |
3688 | ||
3689 | case 'r': | |
3690 | *(string.pointer++) = '\x0D'; | |
3691 | break; | |
3692 | ||
3693 | case 'e': | |
3694 | *(string.pointer++) = '\x1B'; | |
3695 | break; | |
3696 | ||
3697 | case ' ': | |
3698 | *(string.pointer++) = '\x20'; | |
3699 | break; | |
3700 | ||
3701 | case '"': | |
3702 | *(string.pointer++) = '"'; | |
3703 | break; | |
3704 | ||
3705 | case '\'': | |
3706 | *(string.pointer++) = '\''; | |
3707 | break; | |
3708 | ||
7e32c194 KS |
3709 | case '\\': |
3710 | *(string.pointer++) = '\\'; | |
3711 | break; | |
3712 | ||
21fbedd4 KS |
3713 | case 'N': /* NEL (#x85) */ |
3714 | *(string.pointer++) = '\xC2'; | |
3715 | *(string.pointer++) = '\x85'; | |
3716 | break; | |
3717 | ||
3718 | case '_': /* #xA0 */ | |
3719 | *(string.pointer++) = '\xC2'; | |
3720 | *(string.pointer++) = '\xA0'; | |
3721 | break; | |
3722 | ||
3723 | case 'L': /* LS (#x2028) */ | |
3724 | *(string.pointer++) = '\xE2'; | |
3725 | *(string.pointer++) = '\x80'; | |
3726 | *(string.pointer++) = '\xA8'; | |
3727 | break; | |
3728 | ||
3729 | case 'P': /* PS (#x2029) */ | |
3730 | *(string.pointer++) = '\xE2'; | |
3731 | *(string.pointer++) = '\x80'; | |
7e32c194 | 3732 | *(string.pointer++) = '\xA9'; |
21fbedd4 KS |
3733 | break; |
3734 | ||
3735 | case 'x': | |
3736 | code_length = 2; | |
3737 | break; | |
3738 | ||
3739 | case 'u': | |
3740 | code_length = 4; | |
3741 | break; | |
3742 | ||
3743 | case 'U': | |
3744 | code_length = 8; | |
3745 | break; | |
3746 | ||
3747 | default: | |
3748 | yaml_parser_set_scanner_error(parser, "while parsing a quoted scalar", | |
3749 | start_mark, "found unknown escape character"); | |
3750 | goto error; | |
3751 | } | |
3752 | ||
3753 | FORWARD(parser); | |
3754 | FORWARD(parser); | |
3755 | ||
3756 | /* Consume an arbitrary escape code. */ | |
3757 | ||
3758 | if (code_length) | |
3759 | { | |
3760 | unsigned int value = 0; | |
3761 | int k; | |
3762 | ||
3763 | /* Scan the character value. */ | |
3764 | ||
3765 | if (!UPDATE(parser, code_length)) goto error; | |
3766 | ||
3767 | for (k = 0; k < code_length; k ++) { | |
3768 | if (!IS_HEX_AT(parser, k)) { | |
3769 | yaml_parser_set_scanner_error(parser, "while parsing a quoted scalar", | |
3770 | start_mark, "did not find expected hexdecimal number"); | |
3771 | goto error; | |
3772 | } | |
3773 | value = (value << 4) + AS_HEX_AT(parser, k); | |
3774 | } | |
3775 | ||
3776 | /* Check the value and write the character. */ | |
3777 | ||
3778 | if ((value >= 0xD800 && value <= 0xDFFF) || value > 0x10FFFF) { | |
3779 | yaml_parser_set_scanner_error(parser, "while parsing a quoted scalar", | |
3780 | start_mark, "found invalid Unicode character escape code"); | |
3781 | goto error; | |
3782 | } | |
3783 | ||
3784 | if (value <= 0x7F) { | |
3785 | *(string.pointer++) = value; | |
3786 | } | |
3787 | else if (value <= 0x7FF) { | |
3788 | *(string.pointer++) = 0xC0 + (value >> 6); | |
3789 | *(string.pointer++) = 0x80 + (value & 0x3F); | |
3790 | } | |
3791 | else if (value <= 0xFFFF) { | |
3792 | *(string.pointer++) = 0xE0 + (value >> 12); | |
3793 | *(string.pointer++) = 0x80 + ((value >> 6) & 0x3F); | |
3794 | *(string.pointer++) = 0x80 + (value & 0x3F); | |
3795 | } | |
3796 | else { | |
3797 | *(string.pointer++) = 0xF0 + (value >> 18); | |
3798 | *(string.pointer++) = 0x80 + ((value >> 12) & 0x3F); | |
3799 | *(string.pointer++) = 0x80 + ((value >> 6) & 0x3F); | |
3800 | *(string.pointer++) = 0x80 + (value & 0x3F); | |
3801 | } | |
3802 | ||
3803 | /* Advance the pointer. */ | |
3804 | ||
3805 | for (k = 0; k < code_length; k ++) { | |
3806 | FORWARD(parser); | |
3807 | } | |
3808 | } | |
3809 | } | |
3810 | ||
3811 | else | |
3812 | { | |
3813 | /* It is a non-escaped non-blank character. */ | |
3814 | ||
3815 | COPY(parser, string); | |
3816 | } | |
3817 | ||
3818 | if (!UPDATE(parser, 2)) goto error; | |
3819 | if (!RESIZE(parser, string)) goto error; | |
3820 | } | |
3821 | ||
3822 | /* Check if we are at the end of the scalar. */ | |
3823 | ||
3824 | if (CHECK(parser, single ? '\'' : '"')) | |
3825 | break; | |
3826 | ||
3827 | /* Consume blank characters. */ | |
3828 | ||
3829 | if (!UPDATE(parser, 1)) goto error; | |
3830 | ||
3831 | while (IS_BLANK(parser) || IS_BREAK(parser)) | |
3832 | { | |
3833 | if (IS_BLANK(parser)) | |
3834 | { | |
3835 | /* Consume a space or a tab character. */ | |
3836 | ||
3837 | if (!leading_blanks) { | |
3838 | if (!RESIZE(parser, whitespaces)) goto error; | |
3839 | COPY(parser, whitespaces); | |
3840 | } | |
7e32c194 KS |
3841 | else { |
3842 | FORWARD(parser); | |
3843 | } | |
21fbedd4 KS |
3844 | } |
3845 | else | |
3846 | { | |
3847 | if (!UPDATE(parser, 2)) goto error; | |
3848 | ||
3849 | /* Check if it is a first line break. */ | |
3850 | ||
3851 | if (!leading_blanks) | |
3852 | { | |
3853 | yaml_parser_clear_string(parser, &whitespaces); | |
3854 | COPY_LINE(parser, leading_break); | |
3855 | leading_blanks = 1; | |
3856 | } | |
3857 | else | |
3858 | { | |
3859 | if (!RESIZE(parser, trailing_breaks)) goto error; | |
3860 | COPY_LINE(parser, trailing_breaks); | |
3861 | } | |
3862 | } | |
3863 | if (!UPDATE(parser, 1)) goto error; | |
3864 | } | |
3865 | ||
3866 | /* Join the whitespaces or fold line breaks. */ | |
3867 | ||
3868 | if (!RESIZE(parser, string)) goto error; | |
3869 | ||
3870 | if (leading_blanks) | |
3871 | { | |
3872 | /* Do we need to fold line breaks? */ | |
3873 | ||
3874 | if (leading_break.buffer[0] == '\n') { | |
3875 | if (trailing_breaks.buffer[0] == '\0') { | |
3876 | *(string.pointer++) = ' '; | |
3877 | } | |
3878 | else { | |
3879 | if (!JOIN(parser, string, trailing_breaks)) goto error; | |
3880 | } | |
3881 | yaml_parser_clear_string(parser, &leading_break); | |
3882 | } | |
3883 | else { | |
3884 | if (!JOIN(parser, string, leading_break)) goto error; | |
3885 | if (!JOIN(parser, string, trailing_breaks)) goto error; | |
3886 | } | |
3887 | } | |
3888 | else | |
3889 | { | |
3890 | if (!JOIN(parser, string, whitespaces)) goto error; | |
3891 | } | |
3892 | } | |
3893 | ||
3894 | /* Eat the right quote. */ | |
3895 | ||
3896 | FORWARD(parser); | |
3897 | ||
3898 | end_mark = yaml_parser_get_mark(parser); | |
3899 | ||
3900 | /* Create a token. */ | |
3901 | ||
3902 | token = yaml_scalar_token_new(string.buffer, string.pointer-string.buffer, | |
3903 | single ? YAML_SINGLE_QUOTED_SCALAR_STYLE : YAML_DOUBLE_QUOTED_SCALAR_STYLE, | |
3904 | start_mark, end_mark); | |
3905 | if (!token) { | |
3906 | parser->error = YAML_MEMORY_ERROR; | |
3907 | return 0; | |
3908 | } | |
3909 | ||
3910 | yaml_free(leading_break.buffer); | |
3911 | yaml_free(trailing_breaks.buffer); | |
3912 | yaml_free(whitespaces.buffer); | |
3913 | ||
3914 | return token; | |
3915 | ||
3916 | error: | |
3917 | yaml_free(string.buffer); | |
3918 | yaml_free(leading_break.buffer); | |
3919 | yaml_free(trailing_breaks.buffer); | |
3920 | yaml_free(whitespaces.buffer); | |
3921 | ||
3922 | return NULL; | |
3923 | } | |
3924 | ||
3925 | /* | |
3926 | * Scan a plain scalar. | |
3927 | */ | |
3928 | ||
3929 | static yaml_token_t * | |
3930 | yaml_parser_scan_plain_scalar(yaml_parser_t *parser) | |
3931 | { | |
3932 | yaml_mark_t start_mark; | |
3933 | yaml_mark_t end_mark; | |
3934 | yaml_string_t string = yaml_parser_new_string(parser); | |
3935 | yaml_string_t leading_break = yaml_parser_new_string(parser); | |
3936 | yaml_string_t trailing_breaks = yaml_parser_new_string(parser); | |
3937 | yaml_string_t whitespaces = yaml_parser_new_string(parser); | |
3938 | yaml_token_t *token = NULL; | |
3939 | int leading_blanks = 0; | |
3940 | int indent = parser->indent+1; | |
3941 | ||
3942 | if (!string.buffer) goto error; | |
3943 | if (!leading_break.buffer) goto error; | |
3944 | if (!trailing_breaks.buffer) goto error; | |
3945 | if (!whitespaces.buffer) goto error; | |
3946 | ||
3947 | start_mark = yaml_parser_get_mark(parser); | |
3948 | ||
3949 | /* Consume the content of the plain scalar. */ | |
3950 | ||
3951 | while (1) | |
3952 | { | |
3953 | /* Check for a document indicator. */ | |
3954 | ||
3955 | if (!UPDATE(parser, 4)) goto error; | |
3956 | ||
3957 | if (parser->column == 0 && | |
3958 | ((CHECK_AT(parser, '-', 0) && | |
3959 | CHECK_AT(parser, '-', 1) && | |
3960 | CHECK_AT(parser, '-', 2)) || | |
3961 | (CHECK_AT(parser, '.', 0) && | |
3962 | CHECK_AT(parser, '.', 1) && | |
3963 | CHECK_AT(parser, '.', 2))) && | |
3964 | IS_BLANKZ_AT(parser, 3)) break; | |
3965 | ||
3966 | /* Check for a comment. */ | |
3967 | ||
3968 | if (CHECK(parser, '#')) | |
3969 | break; | |
3970 | ||
3971 | /* Consume non-blank characters. */ | |
3972 | ||
3973 | while (!IS_BLANKZ(parser)) | |
3974 | { | |
7e32c194 | 3975 | /* Check for 'x:x' in the flow context. TODO: Fix the test "spec-08-13". */ |
21fbedd4 KS |
3976 | |
3977 | if (parser->flow_level && CHECK(parser, ':') && !IS_BLANKZ_AT(parser, 1)) { | |
3978 | yaml_parser_set_scanner_error(parser, "while scanning a plain scalar", | |
3979 | start_mark, "found unexpected ':'"); | |
3980 | goto error; | |
3981 | } | |
3982 | ||
3983 | /* Check for indicators that may end a plain scalar. */ | |
3984 | ||
3985 | if ((CHECK(parser, ':') && IS_BLANKZ_AT(parser, 1)) || | |
3986 | (parser->flow_level && | |
3987 | (CHECK(parser, ',') || CHECK(parser, ':') || | |
3988 | CHECK(parser, '?') || CHECK(parser, '[') || | |
3989 | CHECK(parser, ']') || CHECK(parser, '{') || | |
3990 | CHECK(parser, '}')))) | |
3991 | break; | |
3992 | ||
3993 | /* Check if we need to join whitespaces and breaks. */ | |
3994 | ||
3995 | if (leading_blanks || whitespaces.buffer != whitespaces.pointer) | |
3996 | { | |
3997 | if (!RESIZE(parser, string)) goto error; | |
3998 | ||
3999 | if (leading_blanks) | |
4000 | { | |
4001 | /* Do we need to fold line breaks? */ | |
4002 | ||
4003 | if (leading_break.buffer[0] == '\n') { | |
4004 | if (trailing_breaks.buffer[0] == '\0') { | |
4005 | *(string.pointer++) = ' '; | |
4006 | } | |
4007 | else { | |
4008 | if (!JOIN(parser, string, trailing_breaks)) goto error; | |
4009 | } | |
4010 | yaml_parser_clear_string(parser, &leading_break); | |
4011 | } | |
4012 | else { | |
4013 | if (!JOIN(parser, string, leading_break)) goto error; | |
4014 | if (!JOIN(parser, string, trailing_breaks)) goto error; | |
4015 | } | |
4016 | ||
4017 | leading_blanks = 0; | |
4018 | } | |
4019 | else | |
4020 | { | |
4021 | if (!JOIN(parser, string, whitespaces)) goto error; | |
4022 | } | |
4023 | } | |
4024 | ||
4025 | /* Copy the character. */ | |
4026 | ||
4027 | if (!RESIZE(parser, string)) goto error; | |
4028 | ||
4029 | COPY(parser, string); | |
4030 | ||
4031 | end_mark = yaml_parser_get_mark(parser); | |
4032 | ||
4033 | if (!UPDATE(parser, 2)) goto error; | |
4034 | } | |
4035 | ||
4036 | /* Is it the end? */ | |
4037 | ||
4038 | if (!(IS_BLANK(parser) || IS_BREAK(parser))) | |
4039 | break; | |
4040 | ||
4041 | /* Consume blank characters. */ | |
4042 | ||
4043 | if (!UPDATE(parser, 1)) goto error; | |
4044 | ||
4045 | while (IS_BLANK(parser) || IS_BREAK(parser)) | |
4046 | { | |
4047 | if (IS_BLANK(parser)) | |
4048 | { | |
4049 | /* Check for tab character that abuse intendation. */ | |
4050 | ||
4051 | if (leading_blanks && parser->column < indent && IS_TAB(parser)) { | |
4052 | yaml_parser_set_scanner_error(parser, "while scanning a plain scalar", | |
4053 | start_mark, "found a tab character that violate intendation"); | |
7e32c194 | 4054 | goto error; |
21fbedd4 KS |
4055 | } |
4056 | ||
4057 | /* Consume a space or a tab character. */ | |
4058 | ||
4059 | if (!leading_blanks) { | |
4060 | if (!RESIZE(parser, whitespaces)) goto error; | |
4061 | COPY(parser, whitespaces); | |
4062 | } | |
7e32c194 KS |
4063 | else { |
4064 | FORWARD(parser); | |
4065 | } | |
21fbedd4 KS |
4066 | } |
4067 | else | |
4068 | { | |
4069 | if (!UPDATE(parser, 2)) goto error; | |
4070 | ||
4071 | /* Check if it is a first line break. */ | |
4072 | ||
4073 | if (!leading_blanks) | |
4074 | { | |
4075 | yaml_parser_clear_string(parser, &whitespaces); | |
4076 | COPY_LINE(parser, leading_break); | |
4077 | leading_blanks = 1; | |
4078 | } | |
4079 | else | |
4080 | { | |
4081 | if (!RESIZE(parser, trailing_breaks)) goto error; | |
4082 | COPY_LINE(parser, trailing_breaks); | |
4083 | } | |
4084 | } | |
4085 | if (!UPDATE(parser, 1)) goto error; | |
4086 | } | |
4087 | ||
4088 | /* Check intendation level. */ | |
4089 | ||
7e32c194 | 4090 | if (!parser->flow_level && parser->column < indent) |
21fbedd4 KS |
4091 | break; |
4092 | } | |
4093 | ||
4094 | /* Create a token. */ | |
4095 | ||
4096 | token = yaml_scalar_token_new(string.buffer, string.pointer-string.buffer, | |
4097 | YAML_PLAIN_SCALAR_STYLE, start_mark, end_mark); | |
4098 | if (!token) { | |
4099 | parser->error = YAML_MEMORY_ERROR; | |
4100 | return 0; | |
4101 | } | |
4102 | ||
4103 | /* Note that we change the 'simple_key_allowed' flag. */ | |
4104 | ||
4105 | if (leading_blanks) { | |
4106 | parser->simple_key_allowed = 1; | |
4107 | } | |
4108 | ||
4109 | yaml_free(leading_break.buffer); | |
4110 | yaml_free(trailing_breaks.buffer); | |
4111 | yaml_free(whitespaces.buffer); | |
4112 | ||
4113 | return token; | |
4114 | ||
4115 | error: | |
4116 | yaml_free(string.buffer); | |
4117 | yaml_free(leading_break.buffer); | |
4118 | yaml_free(trailing_breaks.buffer); | |
4119 | yaml_free(whitespaces.buffer); | |
4120 | ||
4121 | return NULL; | |
4122 | } | |
4123 |