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863486a6 AG |
1 | package yaml |
2 | ||
3 | import ( | |
4 | "bytes" | |
5 | "fmt" | |
6 | ) | |
7 | ||
8 | // Introduction | |
9 | // ************ | |
10 | // | |
11 | // The following notes assume that you are familiar with the YAML specification | |
12 | // (http://yaml.org/spec/1.2/spec.html). We mostly follow it, although in | |
13 | // some cases we are less restrictive that it requires. | |
14 | // | |
15 | // The process of transforming a YAML stream into a sequence of events is | |
16 | // divided on two steps: Scanning and Parsing. | |
17 | // | |
18 | // The Scanner transforms the input stream into a sequence of tokens, while the | |
19 | // parser transform the sequence of tokens produced by the Scanner into a | |
20 | // sequence of parsing events. | |
21 | // | |
22 | // The Scanner is rather clever and complicated. The Parser, on the contrary, | |
23 | // is a straightforward implementation of a recursive-descendant parser (or, | |
24 | // LL(1) parser, as it is usually called). | |
25 | // | |
26 | // Actually there are two issues of Scanning that might be called "clever", the | |
27 | // rest is quite straightforward. The issues are "block collection start" and | |
28 | // "simple keys". Both issues are explained below in details. | |
29 | // | |
30 | // Here the Scanning step is explained and implemented. We start with the list | |
31 | // of all the tokens produced by the Scanner together with short descriptions. | |
32 | // | |
33 | // Now, tokens: | |
34 | // | |
35 | // STREAM-START(encoding) # The stream start. | |
36 | // STREAM-END # The stream end. | |
37 | // VERSION-DIRECTIVE(major,minor) # The '%YAML' directive. | |
38 | // TAG-DIRECTIVE(handle,prefix) # The '%TAG' directive. | |
39 | // DOCUMENT-START # '---' | |
40 | // DOCUMENT-END # '...' | |
41 | // BLOCK-SEQUENCE-START # Indentation increase denoting a block | |
42 | // BLOCK-MAPPING-START # sequence or a block mapping. | |
43 | // BLOCK-END # Indentation decrease. | |
44 | // FLOW-SEQUENCE-START # '[' | |
45 | // FLOW-SEQUENCE-END # ']' | |
46 | // BLOCK-SEQUENCE-START # '{' | |
47 | // BLOCK-SEQUENCE-END # '}' | |
48 | // BLOCK-ENTRY # '-' | |
49 | // FLOW-ENTRY # ',' | |
50 | // KEY # '?' or nothing (simple keys). | |
51 | // VALUE # ':' | |
52 | // ALIAS(anchor) # '*anchor' | |
53 | // ANCHOR(anchor) # '&anchor' | |
54 | // TAG(handle,suffix) # '!handle!suffix' | |
55 | // SCALAR(value,style) # A scalar. | |
56 | // | |
57 | // The following two tokens are "virtual" tokens denoting the beginning and the | |
58 | // end of the stream: | |
59 | // | |
60 | // STREAM-START(encoding) | |
61 | // STREAM-END | |
62 | // | |
63 | // We pass the information about the input stream encoding with the | |
64 | // STREAM-START token. | |
65 | // | |
66 | // The next two tokens are responsible for tags: | |
67 | // | |
68 | // VERSION-DIRECTIVE(major,minor) | |
69 | // TAG-DIRECTIVE(handle,prefix) | |
70 | // | |
71 | // Example: | |
72 | // | |
73 | // %YAML 1.1 | |
74 | // %TAG ! !foo | |
75 | // %TAG !yaml! tag:yaml.org,2002: | |
76 | // --- | |
77 | // | |
78 | // The correspoding sequence of tokens: | |
79 | // | |
80 | // STREAM-START(utf-8) | |
81 | // VERSION-DIRECTIVE(1,1) | |
82 | // TAG-DIRECTIVE("!","!foo") | |
83 | // TAG-DIRECTIVE("!yaml","tag:yaml.org,2002:") | |
84 | // DOCUMENT-START | |
85 | // STREAM-END | |
86 | // | |
87 | // Note that the VERSION-DIRECTIVE and TAG-DIRECTIVE tokens occupy a whole | |
88 | // line. | |
89 | // | |
90 | // The document start and end indicators are represented by: | |
91 | // | |
92 | // DOCUMENT-START | |
93 | // DOCUMENT-END | |
94 | // | |
95 | // Note that if a YAML stream contains an implicit document (without '---' | |
96 | // and '...' indicators), no DOCUMENT-START and DOCUMENT-END tokens will be | |
97 | // produced. | |
98 | // | |
99 | // In the following examples, we present whole documents together with the | |
100 | // produced tokens. | |
101 | // | |
102 | // 1. An implicit document: | |
103 | // | |
104 | // 'a scalar' | |
105 | // | |
106 | // Tokens: | |
107 | // | |
108 | // STREAM-START(utf-8) | |
109 | // SCALAR("a scalar",single-quoted) | |
110 | // STREAM-END | |
111 | // | |
112 | // 2. An explicit document: | |
113 | // | |
114 | // --- | |
115 | // 'a scalar' | |
116 | // ... | |
117 | // | |
118 | // Tokens: | |
119 | // | |
120 | // STREAM-START(utf-8) | |
121 | // DOCUMENT-START | |
122 | // SCALAR("a scalar",single-quoted) | |
123 | // DOCUMENT-END | |
124 | // STREAM-END | |
125 | // | |
126 | // 3. Several documents in a stream: | |
127 | // | |
128 | // 'a scalar' | |
129 | // --- | |
130 | // 'another scalar' | |
131 | // --- | |
132 | // 'yet another scalar' | |
133 | // | |
134 | // Tokens: | |
135 | // | |
136 | // STREAM-START(utf-8) | |
137 | // SCALAR("a scalar",single-quoted) | |
138 | // DOCUMENT-START | |
139 | // SCALAR("another scalar",single-quoted) | |
140 | // DOCUMENT-START | |
141 | // SCALAR("yet another scalar",single-quoted) | |
142 | // STREAM-END | |
143 | // | |
144 | // We have already introduced the SCALAR token above. The following tokens are | |
145 | // used to describe aliases, anchors, tag, and scalars: | |
146 | // | |
147 | // ALIAS(anchor) | |
148 | // ANCHOR(anchor) | |
149 | // TAG(handle,suffix) | |
150 | // SCALAR(value,style) | |
151 | // | |
152 | // The following series of examples illustrate the usage of these tokens: | |
153 | // | |
154 | // 1. A recursive sequence: | |
155 | // | |
156 | // &A [ *A ] | |
157 | // | |
158 | // Tokens: | |
159 | // | |
160 | // STREAM-START(utf-8) | |
161 | // ANCHOR("A") | |
162 | // FLOW-SEQUENCE-START | |
163 | // ALIAS("A") | |
164 | // FLOW-SEQUENCE-END | |
165 | // STREAM-END | |
166 | // | |
167 | // 2. A tagged scalar: | |
168 | // | |
169 | // !!float "3.14" # A good approximation. | |
170 | // | |
171 | // Tokens: | |
172 | // | |
173 | // STREAM-START(utf-8) | |
174 | // TAG("!!","float") | |
175 | // SCALAR("3.14",double-quoted) | |
176 | // STREAM-END | |
177 | // | |
178 | // 3. Various scalar styles: | |
179 | // | |
180 | // --- # Implicit empty plain scalars do not produce tokens. | |
181 | // --- a plain scalar | |
182 | // --- 'a single-quoted scalar' | |
183 | // --- "a double-quoted scalar" | |
184 | // --- |- | |
185 | // a literal scalar | |
186 | // --- >- | |
187 | // a folded | |
188 | // scalar | |
189 | // | |
190 | // Tokens: | |
191 | // | |
192 | // STREAM-START(utf-8) | |
193 | // DOCUMENT-START | |
194 | // DOCUMENT-START | |
195 | // SCALAR("a plain scalar",plain) | |
196 | // DOCUMENT-START | |
197 | // SCALAR("a single-quoted scalar",single-quoted) | |
198 | // DOCUMENT-START | |
199 | // SCALAR("a double-quoted scalar",double-quoted) | |
200 | // DOCUMENT-START | |
201 | // SCALAR("a literal scalar",literal) | |
202 | // DOCUMENT-START | |
203 | // SCALAR("a folded scalar",folded) | |
204 | // STREAM-END | |
205 | // | |
206 | // Now it's time to review collection-related tokens. We will start with | |
207 | // flow collections: | |
208 | // | |
209 | // FLOW-SEQUENCE-START | |
210 | // FLOW-SEQUENCE-END | |
211 | // FLOW-MAPPING-START | |
212 | // FLOW-MAPPING-END | |
213 | // FLOW-ENTRY | |
214 | // KEY | |
215 | // VALUE | |
216 | // | |
217 | // The tokens FLOW-SEQUENCE-START, FLOW-SEQUENCE-END, FLOW-MAPPING-START, and | |
218 | // FLOW-MAPPING-END represent the indicators '[', ']', '{', and '}' | |
219 | // correspondingly. FLOW-ENTRY represent the ',' indicator. Finally the | |
220 | // indicators '?' and ':', which are used for denoting mapping keys and values, | |
221 | // are represented by the KEY and VALUE tokens. | |
222 | // | |
223 | // The following examples show flow collections: | |
224 | // | |
225 | // 1. A flow sequence: | |
226 | // | |
227 | // [item 1, item 2, item 3] | |
228 | // | |
229 | // Tokens: | |
230 | // | |
231 | // STREAM-START(utf-8) | |
232 | // FLOW-SEQUENCE-START | |
233 | // SCALAR("item 1",plain) | |
234 | // FLOW-ENTRY | |
235 | // SCALAR("item 2",plain) | |
236 | // FLOW-ENTRY | |
237 | // SCALAR("item 3",plain) | |
238 | // FLOW-SEQUENCE-END | |
239 | // STREAM-END | |
240 | // | |
241 | // 2. A flow mapping: | |
242 | // | |
243 | // { | |
244 | // a simple key: a value, # Note that the KEY token is produced. | |
245 | // ? a complex key: another value, | |
246 | // } | |
247 | // | |
248 | // Tokens: | |
249 | // | |
250 | // STREAM-START(utf-8) | |
251 | // FLOW-MAPPING-START | |
252 | // KEY | |
253 | // SCALAR("a simple key",plain) | |
254 | // VALUE | |
255 | // SCALAR("a value",plain) | |
256 | // FLOW-ENTRY | |
257 | // KEY | |
258 | // SCALAR("a complex key",plain) | |
259 | // VALUE | |
260 | // SCALAR("another value",plain) | |
261 | // FLOW-ENTRY | |
262 | // FLOW-MAPPING-END | |
263 | // STREAM-END | |
264 | // | |
265 | // A simple key is a key which is not denoted by the '?' indicator. Note that | |
266 | // the Scanner still produce the KEY token whenever it encounters a simple key. | |
267 | // | |
268 | // For scanning block collections, the following tokens are used (note that we | |
269 | // repeat KEY and VALUE here): | |
270 | // | |
271 | // BLOCK-SEQUENCE-START | |
272 | // BLOCK-MAPPING-START | |
273 | // BLOCK-END | |
274 | // BLOCK-ENTRY | |
275 | // KEY | |
276 | // VALUE | |
277 | // | |
278 | // The tokens BLOCK-SEQUENCE-START and BLOCK-MAPPING-START denote indentation | |
279 | // increase that precedes a block collection (cf. the INDENT token in Python). | |
280 | // The token BLOCK-END denote indentation decrease that ends a block collection | |
281 | // (cf. the DEDENT token in Python). However YAML has some syntax pecularities | |
282 | // that makes detections of these tokens more complex. | |
283 | // | |
284 | // The tokens BLOCK-ENTRY, KEY, and VALUE are used to represent the indicators | |
285 | // '-', '?', and ':' correspondingly. | |
286 | // | |
287 | // The following examples show how the tokens BLOCK-SEQUENCE-START, | |
288 | // BLOCK-MAPPING-START, and BLOCK-END are emitted by the Scanner: | |
289 | // | |
290 | // 1. Block sequences: | |
291 | // | |
292 | // - item 1 | |
293 | // - item 2 | |
294 | // - | |
295 | // - item 3.1 | |
296 | // - item 3.2 | |
297 | // - | |
298 | // key 1: value 1 | |
299 | // key 2: value 2 | |
300 | // | |
301 | // Tokens: | |
302 | // | |
303 | // STREAM-START(utf-8) | |
304 | // BLOCK-SEQUENCE-START | |
305 | // BLOCK-ENTRY | |
306 | // SCALAR("item 1",plain) | |
307 | // BLOCK-ENTRY | |
308 | // SCALAR("item 2",plain) | |
309 | // BLOCK-ENTRY | |
310 | // BLOCK-SEQUENCE-START | |
311 | // BLOCK-ENTRY | |
312 | // SCALAR("item 3.1",plain) | |
313 | // BLOCK-ENTRY | |
314 | // SCALAR("item 3.2",plain) | |
315 | // BLOCK-END | |
316 | // BLOCK-ENTRY | |
317 | // BLOCK-MAPPING-START | |
318 | // KEY | |
319 | // SCALAR("key 1",plain) | |
320 | // VALUE | |
321 | // SCALAR("value 1",plain) | |
322 | // KEY | |
323 | // SCALAR("key 2",plain) | |
324 | // VALUE | |
325 | // SCALAR("value 2",plain) | |
326 | // BLOCK-END | |
327 | // BLOCK-END | |
328 | // STREAM-END | |
329 | // | |
330 | // 2. Block mappings: | |
331 | // | |
332 | // a simple key: a value # The KEY token is produced here. | |
333 | // ? a complex key | |
334 | // : another value | |
335 | // a mapping: | |
336 | // key 1: value 1 | |
337 | // key 2: value 2 | |
338 | // a sequence: | |
339 | // - item 1 | |
340 | // - item 2 | |
341 | // | |
342 | // Tokens: | |
343 | // | |
344 | // STREAM-START(utf-8) | |
345 | // BLOCK-MAPPING-START | |
346 | // KEY | |
347 | // SCALAR("a simple key",plain) | |
348 | // VALUE | |
349 | // SCALAR("a value",plain) | |
350 | // KEY | |
351 | // SCALAR("a complex key",plain) | |
352 | // VALUE | |
353 | // SCALAR("another value",plain) | |
354 | // KEY | |
355 | // SCALAR("a mapping",plain) | |
356 | // BLOCK-MAPPING-START | |
357 | // KEY | |
358 | // SCALAR("key 1",plain) | |
359 | // VALUE | |
360 | // SCALAR("value 1",plain) | |
361 | // KEY | |
362 | // SCALAR("key 2",plain) | |
363 | // VALUE | |
364 | // SCALAR("value 2",plain) | |
365 | // BLOCK-END | |
366 | // KEY | |
367 | // SCALAR("a sequence",plain) | |
368 | // VALUE | |
369 | // BLOCK-SEQUENCE-START | |
370 | // BLOCK-ENTRY | |
371 | // SCALAR("item 1",plain) | |
372 | // BLOCK-ENTRY | |
373 | // SCALAR("item 2",plain) | |
374 | // BLOCK-END | |
375 | // BLOCK-END | |
376 | // STREAM-END | |
377 | // | |
378 | // YAML does not always require to start a new block collection from a new | |
379 | // line. If the current line contains only '-', '?', and ':' indicators, a new | |
380 | // block collection may start at the current line. The following examples | |
381 | // illustrate this case: | |
382 | // | |
383 | // 1. Collections in a sequence: | |
384 | // | |
385 | // - - item 1 | |
386 | // - item 2 | |
387 | // - key 1: value 1 | |
388 | // key 2: value 2 | |
389 | // - ? complex key | |
390 | // : complex value | |
391 | // | |
392 | // Tokens: | |
393 | // | |
394 | // STREAM-START(utf-8) | |
395 | // BLOCK-SEQUENCE-START | |
396 | // BLOCK-ENTRY | |
397 | // BLOCK-SEQUENCE-START | |
398 | // BLOCK-ENTRY | |
399 | // SCALAR("item 1",plain) | |
400 | // BLOCK-ENTRY | |
401 | // SCALAR("item 2",plain) | |
402 | // BLOCK-END | |
403 | // BLOCK-ENTRY | |
404 | // BLOCK-MAPPING-START | |
405 | // KEY | |
406 | // SCALAR("key 1",plain) | |
407 | // VALUE | |
408 | // SCALAR("value 1",plain) | |
409 | // KEY | |
410 | // SCALAR("key 2",plain) | |
411 | // VALUE | |
412 | // SCALAR("value 2",plain) | |
413 | // BLOCK-END | |
414 | // BLOCK-ENTRY | |
415 | // BLOCK-MAPPING-START | |
416 | // KEY | |
417 | // SCALAR("complex key") | |
418 | // VALUE | |
419 | // SCALAR("complex value") | |
420 | // BLOCK-END | |
421 | // BLOCK-END | |
422 | // STREAM-END | |
423 | // | |
424 | // 2. Collections in a mapping: | |
425 | // | |
426 | // ? a sequence | |
427 | // : - item 1 | |
428 | // - item 2 | |
429 | // ? a mapping | |
430 | // : key 1: value 1 | |
431 | // key 2: value 2 | |
432 | // | |
433 | // Tokens: | |
434 | // | |
435 | // STREAM-START(utf-8) | |
436 | // BLOCK-MAPPING-START | |
437 | // KEY | |
438 | // SCALAR("a sequence",plain) | |
439 | // VALUE | |
440 | // BLOCK-SEQUENCE-START | |
441 | // BLOCK-ENTRY | |
442 | // SCALAR("item 1",plain) | |
443 | // BLOCK-ENTRY | |
444 | // SCALAR("item 2",plain) | |
445 | // BLOCK-END | |
446 | // KEY | |
447 | // SCALAR("a mapping",plain) | |
448 | // VALUE | |
449 | // BLOCK-MAPPING-START | |
450 | // KEY | |
451 | // SCALAR("key 1",plain) | |
452 | // VALUE | |
453 | // SCALAR("value 1",plain) | |
454 | // KEY | |
455 | // SCALAR("key 2",plain) | |
456 | // VALUE | |
457 | // SCALAR("value 2",plain) | |
458 | // BLOCK-END | |
459 | // BLOCK-END | |
460 | // STREAM-END | |
461 | // | |
462 | // YAML also permits non-indented sequences if they are included into a block | |
463 | // mapping. In this case, the token BLOCK-SEQUENCE-START is not produced: | |
464 | // | |
465 | // key: | |
466 | // - item 1 # BLOCK-SEQUENCE-START is NOT produced here. | |
467 | // - item 2 | |
468 | // | |
469 | // Tokens: | |
470 | // | |
471 | // STREAM-START(utf-8) | |
472 | // BLOCK-MAPPING-START | |
473 | // KEY | |
474 | // SCALAR("key",plain) | |
475 | // VALUE | |
476 | // BLOCK-ENTRY | |
477 | // SCALAR("item 1",plain) | |
478 | // BLOCK-ENTRY | |
479 | // SCALAR("item 2",plain) | |
480 | // BLOCK-END | |
481 | // | |
482 | ||
483 | // Ensure that the buffer contains the required number of characters. | |
484 | // Return true on success, false on failure (reader error or memory error). | |
485 | func cache(parser *yaml_parser_t, length int) bool { | |
486 | // [Go] This was inlined: !cache(A, B) -> unread < B && !update(A, B) | |
487 | return parser.unread >= length || yaml_parser_update_buffer(parser, length) | |
488 | } | |
489 | ||
490 | // Advance the buffer pointer. | |
491 | func skip(parser *yaml_parser_t) { | |
492 | parser.mark.index++ | |
493 | parser.mark.column++ | |
494 | parser.unread-- | |
495 | parser.buffer_pos += width(parser.buffer[parser.buffer_pos]) | |
496 | } | |
497 | ||
498 | func skip_line(parser *yaml_parser_t) { | |
499 | if is_crlf(parser.buffer, parser.buffer_pos) { | |
500 | parser.mark.index += 2 | |
501 | parser.mark.column = 0 | |
502 | parser.mark.line++ | |
503 | parser.unread -= 2 | |
504 | parser.buffer_pos += 2 | |
505 | } else if is_break(parser.buffer, parser.buffer_pos) { | |
506 | parser.mark.index++ | |
507 | parser.mark.column = 0 | |
508 | parser.mark.line++ | |
509 | parser.unread-- | |
510 | parser.buffer_pos += width(parser.buffer[parser.buffer_pos]) | |
511 | } | |
512 | } | |
513 | ||
514 | // Copy a character to a string buffer and advance pointers. | |
515 | func read(parser *yaml_parser_t, s []byte) []byte { | |
516 | w := width(parser.buffer[parser.buffer_pos]) | |
517 | if w == 0 { | |
518 | panic("invalid character sequence") | |
519 | } | |
520 | if len(s) == 0 { | |
521 | s = make([]byte, 0, 32) | |
522 | } | |
523 | if w == 1 && len(s)+w <= cap(s) { | |
524 | s = s[:len(s)+1] | |
525 | s[len(s)-1] = parser.buffer[parser.buffer_pos] | |
526 | parser.buffer_pos++ | |
527 | } else { | |
528 | s = append(s, parser.buffer[parser.buffer_pos:parser.buffer_pos+w]...) | |
529 | parser.buffer_pos += w | |
530 | } | |
531 | parser.mark.index++ | |
532 | parser.mark.column++ | |
533 | parser.unread-- | |
534 | return s | |
535 | } | |
536 | ||
537 | // Copy a line break character to a string buffer and advance pointers. | |
538 | func read_line(parser *yaml_parser_t, s []byte) []byte { | |
539 | buf := parser.buffer | |
540 | pos := parser.buffer_pos | |
541 | switch { | |
542 | case buf[pos] == '\r' && buf[pos+1] == '\n': | |
543 | // CR LF . LF | |
544 | s = append(s, '\n') | |
545 | parser.buffer_pos += 2 | |
546 | parser.mark.index++ | |
547 | parser.unread-- | |
548 | case buf[pos] == '\r' || buf[pos] == '\n': | |
549 | // CR|LF . LF | |
550 | s = append(s, '\n') | |
551 | parser.buffer_pos += 1 | |
552 | case buf[pos] == '\xC2' && buf[pos+1] == '\x85': | |
553 | // NEL . LF | |
554 | s = append(s, '\n') | |
555 | parser.buffer_pos += 2 | |
556 | case buf[pos] == '\xE2' && buf[pos+1] == '\x80' && (buf[pos+2] == '\xA8' || buf[pos+2] == '\xA9'): | |
557 | // LS|PS . LS|PS | |
558 | s = append(s, buf[parser.buffer_pos:pos+3]...) | |
559 | parser.buffer_pos += 3 | |
560 | default: | |
561 | return s | |
562 | } | |
563 | parser.mark.index++ | |
564 | parser.mark.column = 0 | |
565 | parser.mark.line++ | |
566 | parser.unread-- | |
567 | return s | |
568 | } | |
569 | ||
570 | // Get the next token. | |
571 | func yaml_parser_scan(parser *yaml_parser_t, token *yaml_token_t) bool { | |
572 | // Erase the token object. | |
573 | *token = yaml_token_t{} // [Go] Is this necessary? | |
574 | ||
575 | // No tokens after STREAM-END or error. | |
576 | if parser.stream_end_produced || parser.error != yaml_NO_ERROR { | |
577 | return true | |
578 | } | |
579 | ||
580 | // Ensure that the tokens queue contains enough tokens. | |
581 | if !parser.token_available { | |
582 | if !yaml_parser_fetch_more_tokens(parser) { | |
583 | return false | |
584 | } | |
585 | } | |
586 | ||
587 | // Fetch the next token from the queue. | |
588 | *token = parser.tokens[parser.tokens_head] | |
589 | parser.tokens_head++ | |
590 | parser.tokens_parsed++ | |
591 | parser.token_available = false | |
592 | ||
593 | if token.typ == yaml_STREAM_END_TOKEN { | |
594 | parser.stream_end_produced = true | |
595 | } | |
596 | return true | |
597 | } | |
598 | ||
599 | // Set the scanner error and return false. | |
600 | func yaml_parser_set_scanner_error(parser *yaml_parser_t, context string, context_mark yaml_mark_t, problem string) bool { | |
601 | parser.error = yaml_SCANNER_ERROR | |
602 | parser.context = context | |
603 | parser.context_mark = context_mark | |
604 | parser.problem = problem | |
605 | parser.problem_mark = parser.mark | |
606 | return false | |
607 | } | |
608 | ||
609 | func yaml_parser_set_scanner_tag_error(parser *yaml_parser_t, directive bool, context_mark yaml_mark_t, problem string) bool { | |
610 | context := "while parsing a tag" | |
611 | if directive { | |
612 | context = "while parsing a %TAG directive" | |
613 | } | |
614 | return yaml_parser_set_scanner_error(parser, context, context_mark, problem) | |
615 | } | |
616 | ||
617 | func trace(args ...interface{}) func() { | |
618 | pargs := append([]interface{}{"+++"}, args...) | |
619 | fmt.Println(pargs...) | |
620 | pargs = append([]interface{}{"---"}, args...) | |
621 | return func() { fmt.Println(pargs...) } | |
622 | } | |
623 | ||
624 | // Ensure that the tokens queue contains at least one token which can be | |
625 | // returned to the Parser. | |
626 | func yaml_parser_fetch_more_tokens(parser *yaml_parser_t) bool { | |
627 | // While we need more tokens to fetch, do it. | |
628 | for { | |
629 | // Check if we really need to fetch more tokens. | |
630 | need_more_tokens := false | |
631 | ||
632 | if parser.tokens_head == len(parser.tokens) { | |
633 | // Queue is empty. | |
634 | need_more_tokens = true | |
635 | } else { | |
636 | // Check if any potential simple key may occupy the head position. | |
637 | if !yaml_parser_stale_simple_keys(parser) { | |
638 | return false | |
639 | } | |
640 | ||
641 | for i := range parser.simple_keys { | |
642 | simple_key := &parser.simple_keys[i] | |
643 | if simple_key.possible && simple_key.token_number == parser.tokens_parsed { | |
644 | need_more_tokens = true | |
645 | break | |
646 | } | |
647 | } | |
648 | } | |
649 | ||
650 | // We are finished. | |
651 | if !need_more_tokens { | |
652 | break | |
653 | } | |
654 | // Fetch the next token. | |
655 | if !yaml_parser_fetch_next_token(parser) { | |
656 | return false | |
657 | } | |
658 | } | |
659 | ||
660 | parser.token_available = true | |
661 | return true | |
662 | } | |
663 | ||
664 | // The dispatcher for token fetchers. | |
665 | func yaml_parser_fetch_next_token(parser *yaml_parser_t) bool { | |
666 | // Ensure that the buffer is initialized. | |
667 | if parser.unread < 1 && !yaml_parser_update_buffer(parser, 1) { | |
668 | return false | |
669 | } | |
670 | ||
671 | // Check if we just started scanning. Fetch STREAM-START then. | |
672 | if !parser.stream_start_produced { | |
673 | return yaml_parser_fetch_stream_start(parser) | |
674 | } | |
675 | ||
676 | // Eat whitespaces and comments until we reach the next token. | |
677 | if !yaml_parser_scan_to_next_token(parser) { | |
678 | return false | |
679 | } | |
680 | ||
681 | // Remove obsolete potential simple keys. | |
682 | if !yaml_parser_stale_simple_keys(parser) { | |
683 | return false | |
684 | } | |
685 | ||
686 | // Check the indentation level against the current column. | |
687 | if !yaml_parser_unroll_indent(parser, parser.mark.column) { | |
688 | return false | |
689 | } | |
690 | ||
691 | // Ensure that the buffer contains at least 4 characters. 4 is the length | |
692 | // of the longest indicators ('--- ' and '... '). | |
693 | if parser.unread < 4 && !yaml_parser_update_buffer(parser, 4) { | |
694 | return false | |
695 | } | |
696 | ||
697 | // Is it the end of the stream? | |
698 | if is_z(parser.buffer, parser.buffer_pos) { | |
699 | return yaml_parser_fetch_stream_end(parser) | |
700 | } | |
701 | ||
702 | // Is it a directive? | |
703 | if parser.mark.column == 0 && parser.buffer[parser.buffer_pos] == '%' { | |
704 | return yaml_parser_fetch_directive(parser) | |
705 | } | |
706 | ||
707 | buf := parser.buffer | |
708 | pos := parser.buffer_pos | |
709 | ||
710 | // Is it the document start indicator? | |
711 | if parser.mark.column == 0 && buf[pos] == '-' && buf[pos+1] == '-' && buf[pos+2] == '-' && is_blankz(buf, pos+3) { | |
712 | return yaml_parser_fetch_document_indicator(parser, yaml_DOCUMENT_START_TOKEN) | |
713 | } | |
714 | ||
715 | // Is it the document end indicator? | |
716 | if parser.mark.column == 0 && buf[pos] == '.' && buf[pos+1] == '.' && buf[pos+2] == '.' && is_blankz(buf, pos+3) { | |
717 | return yaml_parser_fetch_document_indicator(parser, yaml_DOCUMENT_END_TOKEN) | |
718 | } | |
719 | ||
720 | // Is it the flow sequence start indicator? | |
721 | if buf[pos] == '[' { | |
722 | return yaml_parser_fetch_flow_collection_start(parser, yaml_FLOW_SEQUENCE_START_TOKEN) | |
723 | } | |
724 | ||
725 | // Is it the flow mapping start indicator? | |
726 | if parser.buffer[parser.buffer_pos] == '{' { | |
727 | return yaml_parser_fetch_flow_collection_start(parser, yaml_FLOW_MAPPING_START_TOKEN) | |
728 | } | |
729 | ||
730 | // Is it the flow sequence end indicator? | |
731 | if parser.buffer[parser.buffer_pos] == ']' { | |
732 | return yaml_parser_fetch_flow_collection_end(parser, | |
733 | yaml_FLOW_SEQUENCE_END_TOKEN) | |
734 | } | |
735 | ||
736 | // Is it the flow mapping end indicator? | |
737 | if parser.buffer[parser.buffer_pos] == '}' { | |
738 | return yaml_parser_fetch_flow_collection_end(parser, | |
739 | yaml_FLOW_MAPPING_END_TOKEN) | |
740 | } | |
741 | ||
742 | // Is it the flow entry indicator? | |
743 | if parser.buffer[parser.buffer_pos] == ',' { | |
744 | return yaml_parser_fetch_flow_entry(parser) | |
745 | } | |
746 | ||
747 | // Is it the block entry indicator? | |
748 | if parser.buffer[parser.buffer_pos] == '-' && is_blankz(parser.buffer, parser.buffer_pos+1) { | |
749 | return yaml_parser_fetch_block_entry(parser) | |
750 | } | |
751 | ||
752 | // Is it the key indicator? | |
753 | if parser.buffer[parser.buffer_pos] == '?' && (parser.flow_level > 0 || is_blankz(parser.buffer, parser.buffer_pos+1)) { | |
754 | return yaml_parser_fetch_key(parser) | |
755 | } | |
756 | ||
757 | // Is it the value indicator? | |
758 | if parser.buffer[parser.buffer_pos] == ':' && (parser.flow_level > 0 || is_blankz(parser.buffer, parser.buffer_pos+1)) { | |
759 | return yaml_parser_fetch_value(parser) | |
760 | } | |
761 | ||
762 | // Is it an alias? | |
763 | if parser.buffer[parser.buffer_pos] == '*' { | |
764 | return yaml_parser_fetch_anchor(parser, yaml_ALIAS_TOKEN) | |
765 | } | |
766 | ||
767 | // Is it an anchor? | |
768 | if parser.buffer[parser.buffer_pos] == '&' { | |
769 | return yaml_parser_fetch_anchor(parser, yaml_ANCHOR_TOKEN) | |
770 | } | |
771 | ||
772 | // Is it a tag? | |
773 | if parser.buffer[parser.buffer_pos] == '!' { | |
774 | return yaml_parser_fetch_tag(parser) | |
775 | } | |
776 | ||
777 | // Is it a literal scalar? | |
778 | if parser.buffer[parser.buffer_pos] == '|' && parser.flow_level == 0 { | |
779 | return yaml_parser_fetch_block_scalar(parser, true) | |
780 | } | |
781 | ||
782 | // Is it a folded scalar? | |
783 | if parser.buffer[parser.buffer_pos] == '>' && parser.flow_level == 0 { | |
784 | return yaml_parser_fetch_block_scalar(parser, false) | |
785 | } | |
786 | ||
787 | // Is it a single-quoted scalar? | |
788 | if parser.buffer[parser.buffer_pos] == '\'' { | |
789 | return yaml_parser_fetch_flow_scalar(parser, true) | |
790 | } | |
791 | ||
792 | // Is it a double-quoted scalar? | |
793 | if parser.buffer[parser.buffer_pos] == '"' { | |
794 | return yaml_parser_fetch_flow_scalar(parser, false) | |
795 | } | |
796 | ||
797 | // Is it a plain scalar? | |
798 | // | |
799 | // A plain scalar may start with any non-blank characters except | |
800 | // | |
801 | // '-', '?', ':', ',', '[', ']', '{', '}', | |
802 | // '#', '&', '*', '!', '|', '>', '\'', '\"', | |
803 | // '%', '@', '`'. | |
804 | // | |
805 | // In the block context (and, for the '-' indicator, in the flow context | |
806 | // too), it may also start with the characters | |
807 | // | |
808 | // '-', '?', ':' | |
809 | // | |
810 | // if it is followed by a non-space character. | |
811 | // | |
812 | // The last rule is more restrictive than the specification requires. | |
813 | // [Go] Make this logic more reasonable. | |
814 | //switch parser.buffer[parser.buffer_pos] { | |
815 | //case '-', '?', ':', ',', '?', '-', ',', ':', ']', '[', '}', '{', '&', '#', '!', '*', '>', '|', '"', '\'', '@', '%', '-', '`': | |
816 | //} | |
817 | if !(is_blankz(parser.buffer, parser.buffer_pos) || parser.buffer[parser.buffer_pos] == '-' || | |
818 | parser.buffer[parser.buffer_pos] == '?' || parser.buffer[parser.buffer_pos] == ':' || | |
819 | parser.buffer[parser.buffer_pos] == ',' || parser.buffer[parser.buffer_pos] == '[' || | |
820 | parser.buffer[parser.buffer_pos] == ']' || parser.buffer[parser.buffer_pos] == '{' || | |
821 | parser.buffer[parser.buffer_pos] == '}' || parser.buffer[parser.buffer_pos] == '#' || | |
822 | parser.buffer[parser.buffer_pos] == '&' || parser.buffer[parser.buffer_pos] == '*' || | |
823 | parser.buffer[parser.buffer_pos] == '!' || parser.buffer[parser.buffer_pos] == '|' || | |
824 | parser.buffer[parser.buffer_pos] == '>' || parser.buffer[parser.buffer_pos] == '\'' || | |
825 | parser.buffer[parser.buffer_pos] == '"' || parser.buffer[parser.buffer_pos] == '%' || | |
826 | parser.buffer[parser.buffer_pos] == '@' || parser.buffer[parser.buffer_pos] == '`') || | |
827 | (parser.buffer[parser.buffer_pos] == '-' && !is_blank(parser.buffer, parser.buffer_pos+1)) || | |
828 | (parser.flow_level == 0 && | |
829 | (parser.buffer[parser.buffer_pos] == '?' || parser.buffer[parser.buffer_pos] == ':') && | |
830 | !is_blankz(parser.buffer, parser.buffer_pos+1)) { | |
831 | return yaml_parser_fetch_plain_scalar(parser) | |
832 | } | |
833 | ||
834 | // If we don't determine the token type so far, it is an error. | |
835 | return yaml_parser_set_scanner_error(parser, | |
836 | "while scanning for the next token", parser.mark, | |
837 | "found character that cannot start any token") | |
838 | } | |
839 | ||
840 | // Check the list of potential simple keys and remove the positions that | |
841 | // cannot contain simple keys anymore. | |
842 | func yaml_parser_stale_simple_keys(parser *yaml_parser_t) bool { | |
843 | // Check for a potential simple key for each flow level. | |
844 | for i := range parser.simple_keys { | |
845 | simple_key := &parser.simple_keys[i] | |
846 | ||
847 | // The specification requires that a simple key | |
848 | // | |
849 | // - is limited to a single line, | |
850 | // - is shorter than 1024 characters. | |
851 | if simple_key.possible && (simple_key.mark.line < parser.mark.line || simple_key.mark.index+1024 < parser.mark.index) { | |
852 | ||
853 | // Check if the potential simple key to be removed is required. | |
854 | if simple_key.required { | |
855 | return yaml_parser_set_scanner_error(parser, | |
856 | "while scanning a simple key", simple_key.mark, | |
857 | "could not find expected ':'") | |
858 | } | |
859 | simple_key.possible = false | |
860 | } | |
861 | } | |
862 | return true | |
863 | } | |
864 | ||
865 | // Check if a simple key may start at the current position and add it if | |
866 | // needed. | |
867 | func yaml_parser_save_simple_key(parser *yaml_parser_t) bool { | |
868 | // A simple key is required at the current position if the scanner is in | |
869 | // the block context and the current column coincides with the indentation | |
870 | // level. | |
871 | ||
872 | required := parser.flow_level == 0 && parser.indent == parser.mark.column | |
873 | ||
874 | // | |
875 | // If the current position may start a simple key, save it. | |
876 | // | |
877 | if parser.simple_key_allowed { | |
878 | simple_key := yaml_simple_key_t{ | |
879 | possible: true, | |
880 | required: required, | |
881 | token_number: parser.tokens_parsed + (len(parser.tokens) - parser.tokens_head), | |
882 | } | |
883 | simple_key.mark = parser.mark | |
884 | ||
885 | if !yaml_parser_remove_simple_key(parser) { | |
886 | return false | |
887 | } | |
888 | parser.simple_keys[len(parser.simple_keys)-1] = simple_key | |
889 | } | |
890 | return true | |
891 | } | |
892 | ||
893 | // Remove a potential simple key at the current flow level. | |
894 | func yaml_parser_remove_simple_key(parser *yaml_parser_t) bool { | |
895 | i := len(parser.simple_keys) - 1 | |
896 | if parser.simple_keys[i].possible { | |
897 | // If the key is required, it is an error. | |
898 | if parser.simple_keys[i].required { | |
899 | return yaml_parser_set_scanner_error(parser, | |
900 | "while scanning a simple key", parser.simple_keys[i].mark, | |
901 | "could not find expected ':'") | |
902 | } | |
903 | } | |
904 | // Remove the key from the stack. | |
905 | parser.simple_keys[i].possible = false | |
906 | return true | |
907 | } | |
908 | ||
909 | // Increase the flow level and resize the simple key list if needed. | |
910 | func yaml_parser_increase_flow_level(parser *yaml_parser_t) bool { | |
911 | // Reset the simple key on the next level. | |
912 | parser.simple_keys = append(parser.simple_keys, yaml_simple_key_t{}) | |
913 | ||
914 | // Increase the flow level. | |
915 | parser.flow_level++ | |
916 | return true | |
917 | } | |
918 | ||
919 | // Decrease the flow level. | |
920 | func yaml_parser_decrease_flow_level(parser *yaml_parser_t) bool { | |
921 | if parser.flow_level > 0 { | |
922 | parser.flow_level-- | |
923 | parser.simple_keys = parser.simple_keys[:len(parser.simple_keys)-1] | |
924 | } | |
925 | return true | |
926 | } | |
927 | ||
928 | // Push the current indentation level to the stack and set the new level | |
929 | // the current column is greater than the indentation level. In this case, | |
930 | // append or insert the specified token into the token queue. | |
931 | func yaml_parser_roll_indent(parser *yaml_parser_t, column, number int, typ yaml_token_type_t, mark yaml_mark_t) bool { | |
932 | // In the flow context, do nothing. | |
933 | if parser.flow_level > 0 { | |
934 | return true | |
935 | } | |
936 | ||
937 | if parser.indent < column { | |
938 | // Push the current indentation level to the stack and set the new | |
939 | // indentation level. | |
940 | parser.indents = append(parser.indents, parser.indent) | |
941 | parser.indent = column | |
942 | ||
943 | // Create a token and insert it into the queue. | |
944 | token := yaml_token_t{ | |
945 | typ: typ, | |
946 | start_mark: mark, | |
947 | end_mark: mark, | |
948 | } | |
949 | if number > -1 { | |
950 | number -= parser.tokens_parsed | |
951 | } | |
952 | yaml_insert_token(parser, number, &token) | |
953 | } | |
954 | return true | |
955 | } | |
956 | ||
957 | // Pop indentation levels from the indents stack until the current level | |
958 | // becomes less or equal to the column. For each indentation level, append | |
959 | // the BLOCK-END token. | |
960 | func yaml_parser_unroll_indent(parser *yaml_parser_t, column int) bool { | |
961 | // In the flow context, do nothing. | |
962 | if parser.flow_level > 0 { | |
963 | return true | |
964 | } | |
965 | ||
966 | // Loop through the indentation levels in the stack. | |
967 | for parser.indent > column { | |
968 | // Create a token and append it to the queue. | |
969 | token := yaml_token_t{ | |
970 | typ: yaml_BLOCK_END_TOKEN, | |
971 | start_mark: parser.mark, | |
972 | end_mark: parser.mark, | |
973 | } | |
974 | yaml_insert_token(parser, -1, &token) | |
975 | ||
976 | // Pop the indentation level. | |
977 | parser.indent = parser.indents[len(parser.indents)-1] | |
978 | parser.indents = parser.indents[:len(parser.indents)-1] | |
979 | } | |
980 | return true | |
981 | } | |
982 | ||
983 | // Initialize the scanner and produce the STREAM-START token. | |
984 | func yaml_parser_fetch_stream_start(parser *yaml_parser_t) bool { | |
985 | ||
986 | // Set the initial indentation. | |
987 | parser.indent = -1 | |
988 | ||
989 | // Initialize the simple key stack. | |
990 | parser.simple_keys = append(parser.simple_keys, yaml_simple_key_t{}) | |
991 | ||
992 | // A simple key is allowed at the beginning of the stream. | |
993 | parser.simple_key_allowed = true | |
994 | ||
995 | // We have started. | |
996 | parser.stream_start_produced = true | |
997 | ||
998 | // Create the STREAM-START token and append it to the queue. | |
999 | token := yaml_token_t{ | |
1000 | typ: yaml_STREAM_START_TOKEN, | |
1001 | start_mark: parser.mark, | |
1002 | end_mark: parser.mark, | |
1003 | encoding: parser.encoding, | |
1004 | } | |
1005 | yaml_insert_token(parser, -1, &token) | |
1006 | return true | |
1007 | } | |
1008 | ||
1009 | // Produce the STREAM-END token and shut down the scanner. | |
1010 | func yaml_parser_fetch_stream_end(parser *yaml_parser_t) bool { | |
1011 | ||
1012 | // Force new line. | |
1013 | if parser.mark.column != 0 { | |
1014 | parser.mark.column = 0 | |
1015 | parser.mark.line++ | |
1016 | } | |
1017 | ||
1018 | // Reset the indentation level. | |
1019 | if !yaml_parser_unroll_indent(parser, -1) { | |
1020 | return false | |
1021 | } | |
1022 | ||
1023 | // Reset simple keys. | |
1024 | if !yaml_parser_remove_simple_key(parser) { | |
1025 | return false | |
1026 | } | |
1027 | ||
1028 | parser.simple_key_allowed = false | |
1029 | ||
1030 | // Create the STREAM-END token and append it to the queue. | |
1031 | token := yaml_token_t{ | |
1032 | typ: yaml_STREAM_END_TOKEN, | |
1033 | start_mark: parser.mark, | |
1034 | end_mark: parser.mark, | |
1035 | } | |
1036 | yaml_insert_token(parser, -1, &token) | |
1037 | return true | |
1038 | } | |
1039 | ||
1040 | // Produce a VERSION-DIRECTIVE or TAG-DIRECTIVE token. | |
1041 | func yaml_parser_fetch_directive(parser *yaml_parser_t) bool { | |
1042 | // Reset the indentation level. | |
1043 | if !yaml_parser_unroll_indent(parser, -1) { | |
1044 | return false | |
1045 | } | |
1046 | ||
1047 | // Reset simple keys. | |
1048 | if !yaml_parser_remove_simple_key(parser) { | |
1049 | return false | |
1050 | } | |
1051 | ||
1052 | parser.simple_key_allowed = false | |
1053 | ||
1054 | // Create the YAML-DIRECTIVE or TAG-DIRECTIVE token. | |
1055 | token := yaml_token_t{} | |
1056 | if !yaml_parser_scan_directive(parser, &token) { | |
1057 | return false | |
1058 | } | |
1059 | // Append the token to the queue. | |
1060 | yaml_insert_token(parser, -1, &token) | |
1061 | return true | |
1062 | } | |
1063 | ||
1064 | // Produce the DOCUMENT-START or DOCUMENT-END token. | |
1065 | func yaml_parser_fetch_document_indicator(parser *yaml_parser_t, typ yaml_token_type_t) bool { | |
1066 | // Reset the indentation level. | |
1067 | if !yaml_parser_unroll_indent(parser, -1) { | |
1068 | return false | |
1069 | } | |
1070 | ||
1071 | // Reset simple keys. | |
1072 | if !yaml_parser_remove_simple_key(parser) { | |
1073 | return false | |
1074 | } | |
1075 | ||
1076 | parser.simple_key_allowed = false | |
1077 | ||
1078 | // Consume the token. | |
1079 | start_mark := parser.mark | |
1080 | ||
1081 | skip(parser) | |
1082 | skip(parser) | |
1083 | skip(parser) | |
1084 | ||
1085 | end_mark := parser.mark | |
1086 | ||
1087 | // Create the DOCUMENT-START or DOCUMENT-END token. | |
1088 | token := yaml_token_t{ | |
1089 | typ: typ, | |
1090 | start_mark: start_mark, | |
1091 | end_mark: end_mark, | |
1092 | } | |
1093 | // Append the token to the queue. | |
1094 | yaml_insert_token(parser, -1, &token) | |
1095 | return true | |
1096 | } | |
1097 | ||
1098 | // Produce the FLOW-SEQUENCE-START or FLOW-MAPPING-START token. | |
1099 | func yaml_parser_fetch_flow_collection_start(parser *yaml_parser_t, typ yaml_token_type_t) bool { | |
1100 | // The indicators '[' and '{' may start a simple key. | |
1101 | if !yaml_parser_save_simple_key(parser) { | |
1102 | return false | |
1103 | } | |
1104 | ||
1105 | // Increase the flow level. | |
1106 | if !yaml_parser_increase_flow_level(parser) { | |
1107 | return false | |
1108 | } | |
1109 | ||
1110 | // A simple key may follow the indicators '[' and '{'. | |
1111 | parser.simple_key_allowed = true | |
1112 | ||
1113 | // Consume the token. | |
1114 | start_mark := parser.mark | |
1115 | skip(parser) | |
1116 | end_mark := parser.mark | |
1117 | ||
1118 | // Create the FLOW-SEQUENCE-START of FLOW-MAPPING-START token. | |
1119 | token := yaml_token_t{ | |
1120 | typ: typ, | |
1121 | start_mark: start_mark, | |
1122 | end_mark: end_mark, | |
1123 | } | |
1124 | // Append the token to the queue. | |
1125 | yaml_insert_token(parser, -1, &token) | |
1126 | return true | |
1127 | } | |
1128 | ||
1129 | // Produce the FLOW-SEQUENCE-END or FLOW-MAPPING-END token. | |
1130 | func yaml_parser_fetch_flow_collection_end(parser *yaml_parser_t, typ yaml_token_type_t) bool { | |
1131 | // Reset any potential simple key on the current flow level. | |
1132 | if !yaml_parser_remove_simple_key(parser) { | |
1133 | return false | |
1134 | } | |
1135 | ||
1136 | // Decrease the flow level. | |
1137 | if !yaml_parser_decrease_flow_level(parser) { | |
1138 | return false | |
1139 | } | |
1140 | ||
1141 | // No simple keys after the indicators ']' and '}'. | |
1142 | parser.simple_key_allowed = false | |
1143 | ||
1144 | // Consume the token. | |
1145 | ||
1146 | start_mark := parser.mark | |
1147 | skip(parser) | |
1148 | end_mark := parser.mark | |
1149 | ||
1150 | // Create the FLOW-SEQUENCE-END of FLOW-MAPPING-END token. | |
1151 | token := yaml_token_t{ | |
1152 | typ: typ, | |
1153 | start_mark: start_mark, | |
1154 | end_mark: end_mark, | |
1155 | } | |
1156 | // Append the token to the queue. | |
1157 | yaml_insert_token(parser, -1, &token) | |
1158 | return true | |
1159 | } | |
1160 | ||
1161 | // Produce the FLOW-ENTRY token. | |
1162 | func yaml_parser_fetch_flow_entry(parser *yaml_parser_t) bool { | |
1163 | // Reset any potential simple keys on the current flow level. | |
1164 | if !yaml_parser_remove_simple_key(parser) { | |
1165 | return false | |
1166 | } | |
1167 | ||
1168 | // Simple keys are allowed after ','. | |
1169 | parser.simple_key_allowed = true | |
1170 | ||
1171 | // Consume the token. | |
1172 | start_mark := parser.mark | |
1173 | skip(parser) | |
1174 | end_mark := parser.mark | |
1175 | ||
1176 | // Create the FLOW-ENTRY token and append it to the queue. | |
1177 | token := yaml_token_t{ | |
1178 | typ: yaml_FLOW_ENTRY_TOKEN, | |
1179 | start_mark: start_mark, | |
1180 | end_mark: end_mark, | |
1181 | } | |
1182 | yaml_insert_token(parser, -1, &token) | |
1183 | return true | |
1184 | } | |
1185 | ||
1186 | // Produce the BLOCK-ENTRY token. | |
1187 | func yaml_parser_fetch_block_entry(parser *yaml_parser_t) bool { | |
1188 | // Check if the scanner is in the block context. | |
1189 | if parser.flow_level == 0 { | |
1190 | // Check if we are allowed to start a new entry. | |
1191 | if !parser.simple_key_allowed { | |
1192 | return yaml_parser_set_scanner_error(parser, "", parser.mark, | |
1193 | "block sequence entries are not allowed in this context") | |
1194 | } | |
1195 | // Add the BLOCK-SEQUENCE-START token if needed. | |
1196 | if !yaml_parser_roll_indent(parser, parser.mark.column, -1, yaml_BLOCK_SEQUENCE_START_TOKEN, parser.mark) { | |
1197 | return false | |
1198 | } | |
1199 | } else { | |
1200 | // It is an error for the '-' indicator to occur in the flow context, | |
1201 | // but we let the Parser detect and report about it because the Parser | |
1202 | // is able to point to the context. | |
1203 | } | |
1204 | ||
1205 | // Reset any potential simple keys on the current flow level. | |
1206 | if !yaml_parser_remove_simple_key(parser) { | |
1207 | return false | |
1208 | } | |
1209 | ||
1210 | // Simple keys are allowed after '-'. | |
1211 | parser.simple_key_allowed = true | |
1212 | ||
1213 | // Consume the token. | |
1214 | start_mark := parser.mark | |
1215 | skip(parser) | |
1216 | end_mark := parser.mark | |
1217 | ||
1218 | // Create the BLOCK-ENTRY token and append it to the queue. | |
1219 | token := yaml_token_t{ | |
1220 | typ: yaml_BLOCK_ENTRY_TOKEN, | |
1221 | start_mark: start_mark, | |
1222 | end_mark: end_mark, | |
1223 | } | |
1224 | yaml_insert_token(parser, -1, &token) | |
1225 | return true | |
1226 | } | |
1227 | ||
1228 | // Produce the KEY token. | |
1229 | func yaml_parser_fetch_key(parser *yaml_parser_t) bool { | |
1230 | ||
1231 | // In the block context, additional checks are required. | |
1232 | if parser.flow_level == 0 { | |
1233 | // Check if we are allowed to start a new key (not nessesary simple). | |
1234 | if !parser.simple_key_allowed { | |
1235 | return yaml_parser_set_scanner_error(parser, "", parser.mark, | |
1236 | "mapping keys are not allowed in this context") | |
1237 | } | |
1238 | // Add the BLOCK-MAPPING-START token if needed. | |
1239 | if !yaml_parser_roll_indent(parser, parser.mark.column, -1, yaml_BLOCK_MAPPING_START_TOKEN, parser.mark) { | |
1240 | return false | |
1241 | } | |
1242 | } | |
1243 | ||
1244 | // Reset any potential simple keys on the current flow level. | |
1245 | if !yaml_parser_remove_simple_key(parser) { | |
1246 | return false | |
1247 | } | |
1248 | ||
1249 | // Simple keys are allowed after '?' in the block context. | |
1250 | parser.simple_key_allowed = parser.flow_level == 0 | |
1251 | ||
1252 | // Consume the token. | |
1253 | start_mark := parser.mark | |
1254 | skip(parser) | |
1255 | end_mark := parser.mark | |
1256 | ||
1257 | // Create the KEY token and append it to the queue. | |
1258 | token := yaml_token_t{ | |
1259 | typ: yaml_KEY_TOKEN, | |
1260 | start_mark: start_mark, | |
1261 | end_mark: end_mark, | |
1262 | } | |
1263 | yaml_insert_token(parser, -1, &token) | |
1264 | return true | |
1265 | } | |
1266 | ||
1267 | // Produce the VALUE token. | |
1268 | func yaml_parser_fetch_value(parser *yaml_parser_t) bool { | |
1269 | ||
1270 | simple_key := &parser.simple_keys[len(parser.simple_keys)-1] | |
1271 | ||
1272 | // Have we found a simple key? | |
1273 | if simple_key.possible { | |
1274 | // Create the KEY token and insert it into the queue. | |
1275 | token := yaml_token_t{ | |
1276 | typ: yaml_KEY_TOKEN, | |
1277 | start_mark: simple_key.mark, | |
1278 | end_mark: simple_key.mark, | |
1279 | } | |
1280 | yaml_insert_token(parser, simple_key.token_number-parser.tokens_parsed, &token) | |
1281 | ||
1282 | // In the block context, we may need to add the BLOCK-MAPPING-START token. | |
1283 | if !yaml_parser_roll_indent(parser, simple_key.mark.column, | |
1284 | simple_key.token_number, | |
1285 | yaml_BLOCK_MAPPING_START_TOKEN, simple_key.mark) { | |
1286 | return false | |
1287 | } | |
1288 | ||
1289 | // Remove the simple key. | |
1290 | simple_key.possible = false | |
1291 | ||
1292 | // A simple key cannot follow another simple key. | |
1293 | parser.simple_key_allowed = false | |
1294 | ||
1295 | } else { | |
1296 | // The ':' indicator follows a complex key. | |
1297 | ||
1298 | // In the block context, extra checks are required. | |
1299 | if parser.flow_level == 0 { | |
1300 | ||
1301 | // Check if we are allowed to start a complex value. | |
1302 | if !parser.simple_key_allowed { | |
1303 | return yaml_parser_set_scanner_error(parser, "", parser.mark, | |
1304 | "mapping values are not allowed in this context") | |
1305 | } | |
1306 | ||
1307 | // Add the BLOCK-MAPPING-START token if needed. | |
1308 | if !yaml_parser_roll_indent(parser, parser.mark.column, -1, yaml_BLOCK_MAPPING_START_TOKEN, parser.mark) { | |
1309 | return false | |
1310 | } | |
1311 | } | |
1312 | ||
1313 | // Simple keys after ':' are allowed in the block context. | |
1314 | parser.simple_key_allowed = parser.flow_level == 0 | |
1315 | } | |
1316 | ||
1317 | // Consume the token. | |
1318 | start_mark := parser.mark | |
1319 | skip(parser) | |
1320 | end_mark := parser.mark | |
1321 | ||
1322 | // Create the VALUE token and append it to the queue. | |
1323 | token := yaml_token_t{ | |
1324 | typ: yaml_VALUE_TOKEN, | |
1325 | start_mark: start_mark, | |
1326 | end_mark: end_mark, | |
1327 | } | |
1328 | yaml_insert_token(parser, -1, &token) | |
1329 | return true | |
1330 | } | |
1331 | ||
1332 | // Produce the ALIAS or ANCHOR token. | |
1333 | func yaml_parser_fetch_anchor(parser *yaml_parser_t, typ yaml_token_type_t) bool { | |
1334 | // An anchor or an alias could be a simple key. | |
1335 | if !yaml_parser_save_simple_key(parser) { | |
1336 | return false | |
1337 | } | |
1338 | ||
1339 | // A simple key cannot follow an anchor or an alias. | |
1340 | parser.simple_key_allowed = false | |
1341 | ||
1342 | // Create the ALIAS or ANCHOR token and append it to the queue. | |
1343 | var token yaml_token_t | |
1344 | if !yaml_parser_scan_anchor(parser, &token, typ) { | |
1345 | return false | |
1346 | } | |
1347 | yaml_insert_token(parser, -1, &token) | |
1348 | return true | |
1349 | } | |
1350 | ||
1351 | // Produce the TAG token. | |
1352 | func yaml_parser_fetch_tag(parser *yaml_parser_t) bool { | |
1353 | // A tag could be a simple key. | |
1354 | if !yaml_parser_save_simple_key(parser) { | |
1355 | return false | |
1356 | } | |
1357 | ||
1358 | // A simple key cannot follow a tag. | |
1359 | parser.simple_key_allowed = false | |
1360 | ||
1361 | // Create the TAG token and append it to the queue. | |
1362 | var token yaml_token_t | |
1363 | if !yaml_parser_scan_tag(parser, &token) { | |
1364 | return false | |
1365 | } | |
1366 | yaml_insert_token(parser, -1, &token) | |
1367 | return true | |
1368 | } | |
1369 | ||
1370 | // Produce the SCALAR(...,literal) or SCALAR(...,folded) tokens. | |
1371 | func yaml_parser_fetch_block_scalar(parser *yaml_parser_t, literal bool) bool { | |
1372 | // Remove any potential simple keys. | |
1373 | if !yaml_parser_remove_simple_key(parser) { | |
1374 | return false | |
1375 | } | |
1376 | ||
1377 | // A simple key may follow a block scalar. | |
1378 | parser.simple_key_allowed = true | |
1379 | ||
1380 | // Create the SCALAR token and append it to the queue. | |
1381 | var token yaml_token_t | |
1382 | if !yaml_parser_scan_block_scalar(parser, &token, literal) { | |
1383 | return false | |
1384 | } | |
1385 | yaml_insert_token(parser, -1, &token) | |
1386 | return true | |
1387 | } | |
1388 | ||
1389 | // Produce the SCALAR(...,single-quoted) or SCALAR(...,double-quoted) tokens. | |
1390 | func yaml_parser_fetch_flow_scalar(parser *yaml_parser_t, single bool) bool { | |
1391 | // A plain scalar could be a simple key. | |
1392 | if !yaml_parser_save_simple_key(parser) { | |
1393 | return false | |
1394 | } | |
1395 | ||
1396 | // A simple key cannot follow a flow scalar. | |
1397 | parser.simple_key_allowed = false | |
1398 | ||
1399 | // Create the SCALAR token and append it to the queue. | |
1400 | var token yaml_token_t | |
1401 | if !yaml_parser_scan_flow_scalar(parser, &token, single) { | |
1402 | return false | |
1403 | } | |
1404 | yaml_insert_token(parser, -1, &token) | |
1405 | return true | |
1406 | } | |
1407 | ||
1408 | // Produce the SCALAR(...,plain) token. | |
1409 | func yaml_parser_fetch_plain_scalar(parser *yaml_parser_t) bool { | |
1410 | // A plain scalar could be a simple key. | |
1411 | if !yaml_parser_save_simple_key(parser) { | |
1412 | return false | |
1413 | } | |
1414 | ||
1415 | // A simple key cannot follow a flow scalar. | |
1416 | parser.simple_key_allowed = false | |
1417 | ||
1418 | // Create the SCALAR token and append it to the queue. | |
1419 | var token yaml_token_t | |
1420 | if !yaml_parser_scan_plain_scalar(parser, &token) { | |
1421 | return false | |
1422 | } | |
1423 | yaml_insert_token(parser, -1, &token) | |
1424 | return true | |
1425 | } | |
1426 | ||
1427 | // Eat whitespaces and comments until the next token is found. | |
1428 | func yaml_parser_scan_to_next_token(parser *yaml_parser_t) bool { | |
1429 | ||
1430 | // Until the next token is not found. | |
1431 | for { | |
1432 | // Allow the BOM mark to start a line. | |
1433 | if parser.unread < 1 && !yaml_parser_update_buffer(parser, 1) { | |
1434 | return false | |
1435 | } | |
1436 | if parser.mark.column == 0 && is_bom(parser.buffer, parser.buffer_pos) { | |
1437 | skip(parser) | |
1438 | } | |
1439 | ||
1440 | // Eat whitespaces. | |
1441 | // Tabs are allowed: | |
1442 | // - in the flow context | |
1443 | // - in the block context, but not at the beginning of the line or | |
1444 | // after '-', '?', or ':' (complex value). | |
1445 | if parser.unread < 1 && !yaml_parser_update_buffer(parser, 1) { | |
1446 | return false | |
1447 | } | |
1448 | ||
1449 | for parser.buffer[parser.buffer_pos] == ' ' || ((parser.flow_level > 0 || !parser.simple_key_allowed) && parser.buffer[parser.buffer_pos] == '\t') { | |
1450 | skip(parser) | |
1451 | if parser.unread < 1 && !yaml_parser_update_buffer(parser, 1) { | |
1452 | return false | |
1453 | } | |
1454 | } | |
1455 | ||
1456 | // Eat a comment until a line break. | |
1457 | if parser.buffer[parser.buffer_pos] == '#' { | |
1458 | for !is_breakz(parser.buffer, parser.buffer_pos) { | |
1459 | skip(parser) | |
1460 | if parser.unread < 1 && !yaml_parser_update_buffer(parser, 1) { | |
1461 | return false | |
1462 | } | |
1463 | } | |
1464 | } | |
1465 | ||
1466 | // If it is a line break, eat it. | |
1467 | if is_break(parser.buffer, parser.buffer_pos) { | |
1468 | if parser.unread < 2 && !yaml_parser_update_buffer(parser, 2) { | |
1469 | return false | |
1470 | } | |
1471 | skip_line(parser) | |
1472 | ||
1473 | // In the block context, a new line may start a simple key. | |
1474 | if parser.flow_level == 0 { | |
1475 | parser.simple_key_allowed = true | |
1476 | } | |
1477 | } else { | |
1478 | break // We have found a token. | |
1479 | } | |
1480 | } | |
1481 | ||
1482 | return true | |
1483 | } | |
1484 | ||
1485 | // Scan a YAML-DIRECTIVE or TAG-DIRECTIVE token. | |
1486 | // | |
1487 | // Scope: | |
1488 | // %YAML 1.1 # a comment \n | |
1489 | // ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | |
1490 | // %TAG !yaml! tag:yaml.org,2002: \n | |
1491 | // ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | |
1492 | // | |
1493 | func yaml_parser_scan_directive(parser *yaml_parser_t, token *yaml_token_t) bool { | |
1494 | // Eat '%'. | |
1495 | start_mark := parser.mark | |
1496 | skip(parser) | |
1497 | ||
1498 | // Scan the directive name. | |
1499 | var name []byte | |
1500 | if !yaml_parser_scan_directive_name(parser, start_mark, &name) { | |
1501 | return false | |
1502 | } | |
1503 | ||
1504 | // Is it a YAML directive? | |
1505 | if bytes.Equal(name, []byte("YAML")) { | |
1506 | // Scan the VERSION directive value. | |
1507 | var major, minor int8 | |
1508 | if !yaml_parser_scan_version_directive_value(parser, start_mark, &major, &minor) { | |
1509 | return false | |
1510 | } | |
1511 | end_mark := parser.mark | |
1512 | ||
1513 | // Create a VERSION-DIRECTIVE token. | |
1514 | *token = yaml_token_t{ | |
1515 | typ: yaml_VERSION_DIRECTIVE_TOKEN, | |
1516 | start_mark: start_mark, | |
1517 | end_mark: end_mark, | |
1518 | major: major, | |
1519 | minor: minor, | |
1520 | } | |
1521 | ||
1522 | // Is it a TAG directive? | |
1523 | } else if bytes.Equal(name, []byte("TAG")) { | |
1524 | // Scan the TAG directive value. | |
1525 | var handle, prefix []byte | |
1526 | if !yaml_parser_scan_tag_directive_value(parser, start_mark, &handle, &prefix) { | |
1527 | return false | |
1528 | } | |
1529 | end_mark := parser.mark | |
1530 | ||
1531 | // Create a TAG-DIRECTIVE token. | |
1532 | *token = yaml_token_t{ | |
1533 | typ: yaml_TAG_DIRECTIVE_TOKEN, | |
1534 | start_mark: start_mark, | |
1535 | end_mark: end_mark, | |
1536 | value: handle, | |
1537 | prefix: prefix, | |
1538 | } | |
1539 | ||
1540 | // Unknown directive. | |
1541 | } else { | |
1542 | yaml_parser_set_scanner_error(parser, "while scanning a directive", | |
1543 | start_mark, "found unknown directive name") | |
1544 | return false | |
1545 | } | |
1546 | ||
1547 | // Eat the rest of the line including any comments. | |
1548 | if parser.unread < 1 && !yaml_parser_update_buffer(parser, 1) { | |
1549 | return false | |
1550 | } | |
1551 | ||
1552 | for is_blank(parser.buffer, parser.buffer_pos) { | |
1553 | skip(parser) | |
1554 | if parser.unread < 1 && !yaml_parser_update_buffer(parser, 1) { | |
1555 | return false | |
1556 | } | |
1557 | } | |
1558 | ||
1559 | if parser.buffer[parser.buffer_pos] == '#' { | |
1560 | for !is_breakz(parser.buffer, parser.buffer_pos) { | |
1561 | skip(parser) | |
1562 | if parser.unread < 1 && !yaml_parser_update_buffer(parser, 1) { | |
1563 | return false | |
1564 | } | |
1565 | } | |
1566 | } | |
1567 | ||
1568 | // Check if we are at the end of the line. | |
1569 | if !is_breakz(parser.buffer, parser.buffer_pos) { | |
1570 | yaml_parser_set_scanner_error(parser, "while scanning a directive", | |
1571 | start_mark, "did not find expected comment or line break") | |
1572 | return false | |
1573 | } | |
1574 | ||
1575 | // Eat a line break. | |
1576 | if is_break(parser.buffer, parser.buffer_pos) { | |
1577 | if parser.unread < 2 && !yaml_parser_update_buffer(parser, 2) { | |
1578 | return false | |
1579 | } | |
1580 | skip_line(parser) | |
1581 | } | |
1582 | ||
1583 | return true | |
1584 | } | |
1585 | ||
1586 | // Scan the directive name. | |
1587 | // | |
1588 | // Scope: | |
1589 | // %YAML 1.1 # a comment \n | |
1590 | // ^^^^ | |
1591 | // %TAG !yaml! tag:yaml.org,2002: \n | |
1592 | // ^^^ | |
1593 | // | |
1594 | func yaml_parser_scan_directive_name(parser *yaml_parser_t, start_mark yaml_mark_t, name *[]byte) bool { | |
1595 | // Consume the directive name. | |
1596 | if parser.unread < 1 && !yaml_parser_update_buffer(parser, 1) { | |
1597 | return false | |
1598 | } | |
1599 | ||
1600 | var s []byte | |
1601 | for is_alpha(parser.buffer, parser.buffer_pos) { | |
1602 | s = read(parser, s) | |
1603 | if parser.unread < 1 && !yaml_parser_update_buffer(parser, 1) { | |
1604 | return false | |
1605 | } | |
1606 | } | |
1607 | ||
1608 | // Check if the name is empty. | |
1609 | if len(s) == 0 { | |
1610 | yaml_parser_set_scanner_error(parser, "while scanning a directive", | |
1611 | start_mark, "could not find expected directive name") | |
1612 | return false | |
1613 | } | |
1614 | ||
1615 | // Check for an blank character after the name. | |
1616 | if !is_blankz(parser.buffer, parser.buffer_pos) { | |
1617 | yaml_parser_set_scanner_error(parser, "while scanning a directive", | |
1618 | start_mark, "found unexpected non-alphabetical character") | |
1619 | return false | |
1620 | } | |
1621 | *name = s | |
1622 | return true | |
1623 | } | |
1624 | ||
1625 | // Scan the value of VERSION-DIRECTIVE. | |
1626 | // | |
1627 | // Scope: | |
1628 | // %YAML 1.1 # a comment \n | |
1629 | // ^^^^^^ | |
1630 | func yaml_parser_scan_version_directive_value(parser *yaml_parser_t, start_mark yaml_mark_t, major, minor *int8) bool { | |
1631 | // Eat whitespaces. | |
1632 | if parser.unread < 1 && !yaml_parser_update_buffer(parser, 1) { | |
1633 | return false | |
1634 | } | |
1635 | for is_blank(parser.buffer, parser.buffer_pos) { | |
1636 | skip(parser) | |
1637 | if parser.unread < 1 && !yaml_parser_update_buffer(parser, 1) { | |
1638 | return false | |
1639 | } | |
1640 | } | |
1641 | ||
1642 | // Consume the major version number. | |
1643 | if !yaml_parser_scan_version_directive_number(parser, start_mark, major) { | |
1644 | return false | |
1645 | } | |
1646 | ||
1647 | // Eat '.'. | |
1648 | if parser.buffer[parser.buffer_pos] != '.' { | |
1649 | return yaml_parser_set_scanner_error(parser, "while scanning a %YAML directive", | |
1650 | start_mark, "did not find expected digit or '.' character") | |
1651 | } | |
1652 | ||
1653 | skip(parser) | |
1654 | ||
1655 | // Consume the minor version number. | |
1656 | if !yaml_parser_scan_version_directive_number(parser, start_mark, minor) { | |
1657 | return false | |
1658 | } | |
1659 | return true | |
1660 | } | |
1661 | ||
1662 | const max_number_length = 2 | |
1663 | ||
1664 | // Scan the version number of VERSION-DIRECTIVE. | |
1665 | // | |
1666 | // Scope: | |
1667 | // %YAML 1.1 # a comment \n | |
1668 | // ^ | |
1669 | // %YAML 1.1 # a comment \n | |
1670 | // ^ | |
1671 | func yaml_parser_scan_version_directive_number(parser *yaml_parser_t, start_mark yaml_mark_t, number *int8) bool { | |
1672 | ||
1673 | // Repeat while the next character is digit. | |
1674 | if parser.unread < 1 && !yaml_parser_update_buffer(parser, 1) { | |
1675 | return false | |
1676 | } | |
1677 | var value, length int8 | |
1678 | for is_digit(parser.buffer, parser.buffer_pos) { | |
1679 | // Check if the number is too long. | |
1680 | length++ | |
1681 | if length > max_number_length { | |
1682 | return yaml_parser_set_scanner_error(parser, "while scanning a %YAML directive", | |
1683 | start_mark, "found extremely long version number") | |
1684 | } | |
1685 | value = value*10 + int8(as_digit(parser.buffer, parser.buffer_pos)) | |
1686 | skip(parser) | |
1687 | if parser.unread < 1 && !yaml_parser_update_buffer(parser, 1) { | |
1688 | return false | |
1689 | } | |
1690 | } | |
1691 | ||
1692 | // Check if the number was present. | |
1693 | if length == 0 { | |
1694 | return yaml_parser_set_scanner_error(parser, "while scanning a %YAML directive", | |
1695 | start_mark, "did not find expected version number") | |
1696 | } | |
1697 | *number = value | |
1698 | return true | |
1699 | } | |
1700 | ||
1701 | // Scan the value of a TAG-DIRECTIVE token. | |
1702 | // | |
1703 | // Scope: | |
1704 | // %TAG !yaml! tag:yaml.org,2002: \n | |
1705 | // ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | |
1706 | // | |
1707 | func yaml_parser_scan_tag_directive_value(parser *yaml_parser_t, start_mark yaml_mark_t, handle, prefix *[]byte) bool { | |
1708 | var handle_value, prefix_value []byte | |
1709 | ||
1710 | // Eat whitespaces. | |
1711 | if parser.unread < 1 && !yaml_parser_update_buffer(parser, 1) { | |
1712 | return false | |
1713 | } | |
1714 | ||
1715 | for is_blank(parser.buffer, parser.buffer_pos) { | |
1716 | skip(parser) | |
1717 | if parser.unread < 1 && !yaml_parser_update_buffer(parser, 1) { | |
1718 | return false | |
1719 | } | |
1720 | } | |
1721 | ||
1722 | // Scan a handle. | |
1723 | if !yaml_parser_scan_tag_handle(parser, true, start_mark, &handle_value) { | |
1724 | return false | |
1725 | } | |
1726 | ||
1727 | // Expect a whitespace. | |
1728 | if parser.unread < 1 && !yaml_parser_update_buffer(parser, 1) { | |
1729 | return false | |
1730 | } | |
1731 | if !is_blank(parser.buffer, parser.buffer_pos) { | |
1732 | yaml_parser_set_scanner_error(parser, "while scanning a %TAG directive", | |
1733 | start_mark, "did not find expected whitespace") | |
1734 | return false | |
1735 | } | |
1736 | ||
1737 | // Eat whitespaces. | |
1738 | for is_blank(parser.buffer, parser.buffer_pos) { | |
1739 | skip(parser) | |
1740 | if parser.unread < 1 && !yaml_parser_update_buffer(parser, 1) { | |
1741 | return false | |
1742 | } | |
1743 | } | |
1744 | ||
1745 | // Scan a prefix. | |
1746 | if !yaml_parser_scan_tag_uri(parser, true, nil, start_mark, &prefix_value) { | |
1747 | return false | |
1748 | } | |
1749 | ||
1750 | // Expect a whitespace or line break. | |
1751 | if parser.unread < 1 && !yaml_parser_update_buffer(parser, 1) { | |
1752 | return false | |
1753 | } | |
1754 | if !is_blankz(parser.buffer, parser.buffer_pos) { | |
1755 | yaml_parser_set_scanner_error(parser, "while scanning a %TAG directive", | |
1756 | start_mark, "did not find expected whitespace or line break") | |
1757 | return false | |
1758 | } | |
1759 | ||
1760 | *handle = handle_value | |
1761 | *prefix = prefix_value | |
1762 | return true | |
1763 | } | |
1764 | ||
1765 | func yaml_parser_scan_anchor(parser *yaml_parser_t, token *yaml_token_t, typ yaml_token_type_t) bool { | |
1766 | var s []byte | |
1767 | ||
1768 | // Eat the indicator character. | |
1769 | start_mark := parser.mark | |
1770 | skip(parser) | |
1771 | ||
1772 | // Consume the value. | |
1773 | if parser.unread < 1 && !yaml_parser_update_buffer(parser, 1) { | |
1774 | return false | |
1775 | } | |
1776 | ||
1777 | for is_alpha(parser.buffer, parser.buffer_pos) { | |
1778 | s = read(parser, s) | |
1779 | if parser.unread < 1 && !yaml_parser_update_buffer(parser, 1) { | |
1780 | return false | |
1781 | } | |
1782 | } | |
1783 | ||
1784 | end_mark := parser.mark | |
1785 | ||
1786 | /* | |
1787 | * Check if length of the anchor is greater than 0 and it is followed by | |
1788 | * a whitespace character or one of the indicators: | |
1789 | * | |
1790 | * '?', ':', ',', ']', '}', '%', '@', '`'. | |
1791 | */ | |
1792 | ||
1793 | if len(s) == 0 || | |
1794 | !(is_blankz(parser.buffer, parser.buffer_pos) || parser.buffer[parser.buffer_pos] == '?' || | |
1795 | parser.buffer[parser.buffer_pos] == ':' || parser.buffer[parser.buffer_pos] == ',' || | |
1796 | parser.buffer[parser.buffer_pos] == ']' || parser.buffer[parser.buffer_pos] == '}' || | |
1797 | parser.buffer[parser.buffer_pos] == '%' || parser.buffer[parser.buffer_pos] == '@' || | |
1798 | parser.buffer[parser.buffer_pos] == '`') { | |
1799 | context := "while scanning an alias" | |
1800 | if typ == yaml_ANCHOR_TOKEN { | |
1801 | context = "while scanning an anchor" | |
1802 | } | |
1803 | yaml_parser_set_scanner_error(parser, context, start_mark, | |
1804 | "did not find expected alphabetic or numeric character") | |
1805 | return false | |
1806 | } | |
1807 | ||
1808 | // Create a token. | |
1809 | *token = yaml_token_t{ | |
1810 | typ: typ, | |
1811 | start_mark: start_mark, | |
1812 | end_mark: end_mark, | |
1813 | value: s, | |
1814 | } | |
1815 | ||
1816 | return true | |
1817 | } | |
1818 | ||
1819 | /* | |
1820 | * Scan a TAG token. | |
1821 | */ | |
1822 | ||
1823 | func yaml_parser_scan_tag(parser *yaml_parser_t, token *yaml_token_t) bool { | |
1824 | var handle, suffix []byte | |
1825 | ||
1826 | start_mark := parser.mark | |
1827 | ||
1828 | // Check if the tag is in the canonical form. | |
1829 | if parser.unread < 2 && !yaml_parser_update_buffer(parser, 2) { | |
1830 | return false | |
1831 | } | |
1832 | ||
1833 | if parser.buffer[parser.buffer_pos+1] == '<' { | |
1834 | // Keep the handle as '' | |
1835 | ||
1836 | // Eat '!<' | |
1837 | skip(parser) | |
1838 | skip(parser) | |
1839 | ||
1840 | // Consume the tag value. | |
1841 | if !yaml_parser_scan_tag_uri(parser, false, nil, start_mark, &suffix) { | |
1842 | return false | |
1843 | } | |
1844 | ||
1845 | // Check for '>' and eat it. | |
1846 | if parser.buffer[parser.buffer_pos] != '>' { | |
1847 | yaml_parser_set_scanner_error(parser, "while scanning a tag", | |
1848 | start_mark, "did not find the expected '>'") | |
1849 | return false | |
1850 | } | |
1851 | ||
1852 | skip(parser) | |
1853 | } else { | |
1854 | // The tag has either the '!suffix' or the '!handle!suffix' form. | |
1855 | ||
1856 | // First, try to scan a handle. | |
1857 | if !yaml_parser_scan_tag_handle(parser, false, start_mark, &handle) { | |
1858 | return false | |
1859 | } | |
1860 | ||
1861 | // Check if it is, indeed, handle. | |
1862 | if handle[0] == '!' && len(handle) > 1 && handle[len(handle)-1] == '!' { | |
1863 | // Scan the suffix now. | |
1864 | if !yaml_parser_scan_tag_uri(parser, false, nil, start_mark, &suffix) { | |
1865 | return false | |
1866 | } | |
1867 | } else { | |
1868 | // It wasn't a handle after all. Scan the rest of the tag. | |
1869 | if !yaml_parser_scan_tag_uri(parser, false, handle, start_mark, &suffix) { | |
1870 | return false | |
1871 | } | |
1872 | ||
1873 | // Set the handle to '!'. | |
1874 | handle = []byte{'!'} | |
1875 | ||
1876 | // A special case: the '!' tag. Set the handle to '' and the | |
1877 | // suffix to '!'. | |
1878 | if len(suffix) == 0 { | |
1879 | handle, suffix = suffix, handle | |
1880 | } | |
1881 | } | |
1882 | } | |
1883 | ||
1884 | // Check the character which ends the tag. | |
1885 | if parser.unread < 1 && !yaml_parser_update_buffer(parser, 1) { | |
1886 | return false | |
1887 | } | |
1888 | if !is_blankz(parser.buffer, parser.buffer_pos) { | |
1889 | yaml_parser_set_scanner_error(parser, "while scanning a tag", | |
1890 | start_mark, "did not find expected whitespace or line break") | |
1891 | return false | |
1892 | } | |
1893 | ||
1894 | end_mark := parser.mark | |
1895 | ||
1896 | // Create a token. | |
1897 | *token = yaml_token_t{ | |
1898 | typ: yaml_TAG_TOKEN, | |
1899 | start_mark: start_mark, | |
1900 | end_mark: end_mark, | |
1901 | value: handle, | |
1902 | suffix: suffix, | |
1903 | } | |
1904 | return true | |
1905 | } | |
1906 | ||
1907 | // Scan a tag handle. | |
1908 | func yaml_parser_scan_tag_handle(parser *yaml_parser_t, directive bool, start_mark yaml_mark_t, handle *[]byte) bool { | |
1909 | // Check the initial '!' character. | |
1910 | if parser.unread < 1 && !yaml_parser_update_buffer(parser, 1) { | |
1911 | return false | |
1912 | } | |
1913 | if parser.buffer[parser.buffer_pos] != '!' { | |
1914 | yaml_parser_set_scanner_tag_error(parser, directive, | |
1915 | start_mark, "did not find expected '!'") | |
1916 | return false | |
1917 | } | |
1918 | ||
1919 | var s []byte | |
1920 | ||
1921 | // Copy the '!' character. | |
1922 | s = read(parser, s) | |
1923 | ||
1924 | // Copy all subsequent alphabetical and numerical characters. | |
1925 | if parser.unread < 1 && !yaml_parser_update_buffer(parser, 1) { | |
1926 | return false | |
1927 | } | |
1928 | for is_alpha(parser.buffer, parser.buffer_pos) { | |
1929 | s = read(parser, s) | |
1930 | if parser.unread < 1 && !yaml_parser_update_buffer(parser, 1) { | |
1931 | return false | |
1932 | } | |
1933 | } | |
1934 | ||
1935 | // Check if the trailing character is '!' and copy it. | |
1936 | if parser.buffer[parser.buffer_pos] == '!' { | |
1937 | s = read(parser, s) | |
1938 | } else { | |
1939 | // It's either the '!' tag or not really a tag handle. If it's a %TAG | |
1940 | // directive, it's an error. If it's a tag token, it must be a part of URI. | |
1941 | if directive && string(s) != "!" { | |
1942 | yaml_parser_set_scanner_tag_error(parser, directive, | |
1943 | start_mark, "did not find expected '!'") | |
1944 | return false | |
1945 | } | |
1946 | } | |
1947 | ||
1948 | *handle = s | |
1949 | return true | |
1950 | } | |
1951 | ||
1952 | // Scan a tag. | |
1953 | func yaml_parser_scan_tag_uri(parser *yaml_parser_t, directive bool, head []byte, start_mark yaml_mark_t, uri *[]byte) bool { | |
1954 | //size_t length = head ? strlen((char *)head) : 0 | |
1955 | var s []byte | |
1956 | hasTag := len(head) > 0 | |
1957 | ||
1958 | // Copy the head if needed. | |
1959 | // | |
1960 | // Note that we don't copy the leading '!' character. | |
1961 | if len(head) > 1 { | |
1962 | s = append(s, head[1:]...) | |
1963 | } | |
1964 | ||
1965 | // Scan the tag. | |
1966 | if parser.unread < 1 && !yaml_parser_update_buffer(parser, 1) { | |
1967 | return false | |
1968 | } | |
1969 | ||
1970 | // The set of characters that may appear in URI is as follows: | |
1971 | // | |
1972 | // '0'-'9', 'A'-'Z', 'a'-'z', '_', '-', ';', '/', '?', ':', '@', '&', | |
1973 | // '=', '+', '$', ',', '.', '!', '~', '*', '\'', '(', ')', '[', ']', | |
1974 | // '%'. | |
1975 | // [Go] Convert this into more reasonable logic. | |
1976 | for is_alpha(parser.buffer, parser.buffer_pos) || parser.buffer[parser.buffer_pos] == ';' || | |
1977 | parser.buffer[parser.buffer_pos] == '/' || parser.buffer[parser.buffer_pos] == '?' || | |
1978 | parser.buffer[parser.buffer_pos] == ':' || parser.buffer[parser.buffer_pos] == '@' || | |
1979 | parser.buffer[parser.buffer_pos] == '&' || parser.buffer[parser.buffer_pos] == '=' || | |
1980 | parser.buffer[parser.buffer_pos] == '+' || parser.buffer[parser.buffer_pos] == '$' || | |
1981 | parser.buffer[parser.buffer_pos] == ',' || parser.buffer[parser.buffer_pos] == '.' || | |
1982 | parser.buffer[parser.buffer_pos] == '!' || parser.buffer[parser.buffer_pos] == '~' || | |
1983 | parser.buffer[parser.buffer_pos] == '*' || parser.buffer[parser.buffer_pos] == '\'' || | |
1984 | parser.buffer[parser.buffer_pos] == '(' || parser.buffer[parser.buffer_pos] == ')' || | |
1985 | parser.buffer[parser.buffer_pos] == '[' || parser.buffer[parser.buffer_pos] == ']' || | |
1986 | parser.buffer[parser.buffer_pos] == '%' { | |
1987 | // Check if it is a URI-escape sequence. | |
1988 | if parser.buffer[parser.buffer_pos] == '%' { | |
1989 | if !yaml_parser_scan_uri_escapes(parser, directive, start_mark, &s) { | |
1990 | return false | |
1991 | } | |
1992 | } else { | |
1993 | s = read(parser, s) | |
1994 | } | |
1995 | if parser.unread < 1 && !yaml_parser_update_buffer(parser, 1) { | |
1996 | return false | |
1997 | } | |
1998 | hasTag = true | |
1999 | } | |
2000 | ||
2001 | if !hasTag { | |
2002 | yaml_parser_set_scanner_tag_error(parser, directive, | |
2003 | start_mark, "did not find expected tag URI") | |
2004 | return false | |
2005 | } | |
2006 | *uri = s | |
2007 | return true | |
2008 | } | |
2009 | ||
2010 | // Decode an URI-escape sequence corresponding to a single UTF-8 character. | |
2011 | func yaml_parser_scan_uri_escapes(parser *yaml_parser_t, directive bool, start_mark yaml_mark_t, s *[]byte) bool { | |
2012 | ||
2013 | // Decode the required number of characters. | |
2014 | w := 1024 | |
2015 | for w > 0 { | |
2016 | // Check for a URI-escaped octet. | |
2017 | if parser.unread < 3 && !yaml_parser_update_buffer(parser, 3) { | |
2018 | return false | |
2019 | } | |
2020 | ||
2021 | if !(parser.buffer[parser.buffer_pos] == '%' && | |
2022 | is_hex(parser.buffer, parser.buffer_pos+1) && | |
2023 | is_hex(parser.buffer, parser.buffer_pos+2)) { | |
2024 | return yaml_parser_set_scanner_tag_error(parser, directive, | |
2025 | start_mark, "did not find URI escaped octet") | |
2026 | } | |
2027 | ||
2028 | // Get the octet. | |
2029 | octet := byte((as_hex(parser.buffer, parser.buffer_pos+1) << 4) + as_hex(parser.buffer, parser.buffer_pos+2)) | |
2030 | ||
2031 | // If it is the leading octet, determine the length of the UTF-8 sequence. | |
2032 | if w == 1024 { | |
2033 | w = width(octet) | |
2034 | if w == 0 { | |
2035 | return yaml_parser_set_scanner_tag_error(parser, directive, | |
2036 | start_mark, "found an incorrect leading UTF-8 octet") | |
2037 | } | |
2038 | } else { | |
2039 | // Check if the trailing octet is correct. | |
2040 | if octet&0xC0 != 0x80 { | |
2041 | return yaml_parser_set_scanner_tag_error(parser, directive, | |
2042 | start_mark, "found an incorrect trailing UTF-8 octet") | |
2043 | } | |
2044 | } | |
2045 | ||
2046 | // Copy the octet and move the pointers. | |
2047 | *s = append(*s, octet) | |
2048 | skip(parser) | |
2049 | skip(parser) | |
2050 | skip(parser) | |
2051 | w-- | |
2052 | } | |
2053 | return true | |
2054 | } | |
2055 | ||
2056 | // Scan a block scalar. | |
2057 | func yaml_parser_scan_block_scalar(parser *yaml_parser_t, token *yaml_token_t, literal bool) bool { | |
2058 | // Eat the indicator '|' or '>'. | |
2059 | start_mark := parser.mark | |
2060 | skip(parser) | |
2061 | ||
2062 | // Scan the additional block scalar indicators. | |
2063 | if parser.unread < 1 && !yaml_parser_update_buffer(parser, 1) { | |
2064 | return false | |
2065 | } | |
2066 | ||
2067 | // Check for a chomping indicator. | |
2068 | var chomping, increment int | |
2069 | if parser.buffer[parser.buffer_pos] == '+' || parser.buffer[parser.buffer_pos] == '-' { | |
2070 | // Set the chomping method and eat the indicator. | |
2071 | if parser.buffer[parser.buffer_pos] == '+' { | |
2072 | chomping = +1 | |
2073 | } else { | |
2074 | chomping = -1 | |
2075 | } | |
2076 | skip(parser) | |
2077 | ||
2078 | // Check for an indentation indicator. | |
2079 | if parser.unread < 1 && !yaml_parser_update_buffer(parser, 1) { | |
2080 | return false | |
2081 | } | |
2082 | if is_digit(parser.buffer, parser.buffer_pos) { | |
2083 | // Check that the indentation is greater than 0. | |
2084 | if parser.buffer[parser.buffer_pos] == '0' { | |
2085 | yaml_parser_set_scanner_error(parser, "while scanning a block scalar", | |
2086 | start_mark, "found an indentation indicator equal to 0") | |
2087 | return false | |
2088 | } | |
2089 | ||
2090 | // Get the indentation level and eat the indicator. | |
2091 | increment = as_digit(parser.buffer, parser.buffer_pos) | |
2092 | skip(parser) | |
2093 | } | |
2094 | ||
2095 | } else if is_digit(parser.buffer, parser.buffer_pos) { | |
2096 | // Do the same as above, but in the opposite order. | |
2097 | ||
2098 | if parser.buffer[parser.buffer_pos] == '0' { | |
2099 | yaml_parser_set_scanner_error(parser, "while scanning a block scalar", | |
2100 | start_mark, "found an indentation indicator equal to 0") | |
2101 | return false | |
2102 | } | |
2103 | increment = as_digit(parser.buffer, parser.buffer_pos) | |
2104 | skip(parser) | |
2105 | ||
2106 | if parser.unread < 1 && !yaml_parser_update_buffer(parser, 1) { | |
2107 | return false | |
2108 | } | |
2109 | if parser.buffer[parser.buffer_pos] == '+' || parser.buffer[parser.buffer_pos] == '-' { | |
2110 | if parser.buffer[parser.buffer_pos] == '+' { | |
2111 | chomping = +1 | |
2112 | } else { | |
2113 | chomping = -1 | |
2114 | } | |
2115 | skip(parser) | |
2116 | } | |
2117 | } | |
2118 | ||
2119 | // Eat whitespaces and comments to the end of the line. | |
2120 | if parser.unread < 1 && !yaml_parser_update_buffer(parser, 1) { | |
2121 | return false | |
2122 | } | |
2123 | for is_blank(parser.buffer, parser.buffer_pos) { | |
2124 | skip(parser) | |
2125 | if parser.unread < 1 && !yaml_parser_update_buffer(parser, 1) { | |
2126 | return false | |
2127 | } | |
2128 | } | |
2129 | if parser.buffer[parser.buffer_pos] == '#' { | |
2130 | for !is_breakz(parser.buffer, parser.buffer_pos) { | |
2131 | skip(parser) | |
2132 | if parser.unread < 1 && !yaml_parser_update_buffer(parser, 1) { | |
2133 | return false | |
2134 | } | |
2135 | } | |
2136 | } | |
2137 | ||
2138 | // Check if we are at the end of the line. | |
2139 | if !is_breakz(parser.buffer, parser.buffer_pos) { | |
2140 | yaml_parser_set_scanner_error(parser, "while scanning a block scalar", | |
2141 | start_mark, "did not find expected comment or line break") | |
2142 | return false | |
2143 | } | |
2144 | ||
2145 | // Eat a line break. | |
2146 | if is_break(parser.buffer, parser.buffer_pos) { | |
2147 | if parser.unread < 2 && !yaml_parser_update_buffer(parser, 2) { | |
2148 | return false | |
2149 | } | |
2150 | skip_line(parser) | |
2151 | } | |
2152 | ||
2153 | end_mark := parser.mark | |
2154 | ||
2155 | // Set the indentation level if it was specified. | |
2156 | var indent int | |
2157 | if increment > 0 { | |
2158 | if parser.indent >= 0 { | |
2159 | indent = parser.indent + increment | |
2160 | } else { | |
2161 | indent = increment | |
2162 | } | |
2163 | } | |
2164 | ||
2165 | // Scan the leading line breaks and determine the indentation level if needed. | |
2166 | var s, leading_break, trailing_breaks []byte | |
2167 | if !yaml_parser_scan_block_scalar_breaks(parser, &indent, &trailing_breaks, start_mark, &end_mark) { | |
2168 | return false | |
2169 | } | |
2170 | ||
2171 | // Scan the block scalar content. | |
2172 | if parser.unread < 1 && !yaml_parser_update_buffer(parser, 1) { | |
2173 | return false | |
2174 | } | |
2175 | var leading_blank, trailing_blank bool | |
2176 | for parser.mark.column == indent && !is_z(parser.buffer, parser.buffer_pos) { | |
2177 | // We are at the beginning of a non-empty line. | |
2178 | ||
2179 | // Is it a trailing whitespace? | |
2180 | trailing_blank = is_blank(parser.buffer, parser.buffer_pos) | |
2181 | ||
2182 | // Check if we need to fold the leading line break. | |
2183 | if !literal && !leading_blank && !trailing_blank && len(leading_break) > 0 && leading_break[0] == '\n' { | |
2184 | // Do we need to join the lines by space? | |
2185 | if len(trailing_breaks) == 0 { | |
2186 | s = append(s, ' ') | |
2187 | } | |
2188 | } else { | |
2189 | s = append(s, leading_break...) | |
2190 | } | |
2191 | leading_break = leading_break[:0] | |
2192 | ||
2193 | // Append the remaining line breaks. | |
2194 | s = append(s, trailing_breaks...) | |
2195 | trailing_breaks = trailing_breaks[:0] | |
2196 | ||
2197 | // Is it a leading whitespace? | |
2198 | leading_blank = is_blank(parser.buffer, parser.buffer_pos) | |
2199 | ||
2200 | // Consume the current line. | |
2201 | for !is_breakz(parser.buffer, parser.buffer_pos) { | |
2202 | s = read(parser, s) | |
2203 | if parser.unread < 1 && !yaml_parser_update_buffer(parser, 1) { | |
2204 | return false | |
2205 | } | |
2206 | } | |
2207 | ||
2208 | // Consume the line break. | |
2209 | if parser.unread < 2 && !yaml_parser_update_buffer(parser, 2) { | |
2210 | return false | |
2211 | } | |
2212 | ||
2213 | leading_break = read_line(parser, leading_break) | |
2214 | ||
2215 | // Eat the following indentation spaces and line breaks. | |
2216 | if !yaml_parser_scan_block_scalar_breaks(parser, &indent, &trailing_breaks, start_mark, &end_mark) { | |
2217 | return false | |
2218 | } | |
2219 | } | |
2220 | ||
2221 | // Chomp the tail. | |
2222 | if chomping != -1 { | |
2223 | s = append(s, leading_break...) | |
2224 | } | |
2225 | if chomping == 1 { | |
2226 | s = append(s, trailing_breaks...) | |
2227 | } | |
2228 | ||
2229 | // Create a token. | |
2230 | *token = yaml_token_t{ | |
2231 | typ: yaml_SCALAR_TOKEN, | |
2232 | start_mark: start_mark, | |
2233 | end_mark: end_mark, | |
2234 | value: s, | |
2235 | style: yaml_LITERAL_SCALAR_STYLE, | |
2236 | } | |
2237 | if !literal { | |
2238 | token.style = yaml_FOLDED_SCALAR_STYLE | |
2239 | } | |
2240 | return true | |
2241 | } | |
2242 | ||
2243 | // Scan indentation spaces and line breaks for a block scalar. Determine the | |
2244 | // indentation level if needed. | |
2245 | func yaml_parser_scan_block_scalar_breaks(parser *yaml_parser_t, indent *int, breaks *[]byte, start_mark yaml_mark_t, end_mark *yaml_mark_t) bool { | |
2246 | *end_mark = parser.mark | |
2247 | ||
2248 | // Eat the indentation spaces and line breaks. | |
2249 | max_indent := 0 | |
2250 | for { | |
2251 | // Eat the indentation spaces. | |
2252 | if parser.unread < 1 && !yaml_parser_update_buffer(parser, 1) { | |
2253 | return false | |
2254 | } | |
2255 | for (*indent == 0 || parser.mark.column < *indent) && is_space(parser.buffer, parser.buffer_pos) { | |
2256 | skip(parser) | |
2257 | if parser.unread < 1 && !yaml_parser_update_buffer(parser, 1) { | |
2258 | return false | |
2259 | } | |
2260 | } | |
2261 | if parser.mark.column > max_indent { | |
2262 | max_indent = parser.mark.column | |
2263 | } | |
2264 | ||
2265 | // Check for a tab character messing the indentation. | |
2266 | if (*indent == 0 || parser.mark.column < *indent) && is_tab(parser.buffer, parser.buffer_pos) { | |
2267 | return yaml_parser_set_scanner_error(parser, "while scanning a block scalar", | |
2268 | start_mark, "found a tab character where an indentation space is expected") | |
2269 | } | |
2270 | ||
2271 | // Have we found a non-empty line? | |
2272 | if !is_break(parser.buffer, parser.buffer_pos) { | |
2273 | break | |
2274 | } | |
2275 | ||
2276 | // Consume the line break. | |
2277 | if parser.unread < 2 && !yaml_parser_update_buffer(parser, 2) { | |
2278 | return false | |
2279 | } | |
2280 | // [Go] Should really be returning breaks instead. | |
2281 | *breaks = read_line(parser, *breaks) | |
2282 | *end_mark = parser.mark | |
2283 | } | |
2284 | ||
2285 | // Determine the indentation level if needed. | |
2286 | if *indent == 0 { | |
2287 | *indent = max_indent | |
2288 | if *indent < parser.indent+1 { | |
2289 | *indent = parser.indent + 1 | |
2290 | } | |
2291 | if *indent < 1 { | |
2292 | *indent = 1 | |
2293 | } | |
2294 | } | |
2295 | return true | |
2296 | } | |
2297 | ||
2298 | // Scan a quoted scalar. | |
2299 | func yaml_parser_scan_flow_scalar(parser *yaml_parser_t, token *yaml_token_t, single bool) bool { | |
2300 | // Eat the left quote. | |
2301 | start_mark := parser.mark | |
2302 | skip(parser) | |
2303 | ||
2304 | // Consume the content of the quoted scalar. | |
2305 | var s, leading_break, trailing_breaks, whitespaces []byte | |
2306 | for { | |
2307 | // Check that there are no document indicators at the beginning of the line. | |
2308 | if parser.unread < 4 && !yaml_parser_update_buffer(parser, 4) { | |
2309 | return false | |
2310 | } | |
2311 | ||
2312 | if parser.mark.column == 0 && | |
2313 | ((parser.buffer[parser.buffer_pos+0] == '-' && | |
2314 | parser.buffer[parser.buffer_pos+1] == '-' && | |
2315 | parser.buffer[parser.buffer_pos+2] == '-') || | |
2316 | (parser.buffer[parser.buffer_pos+0] == '.' && | |
2317 | parser.buffer[parser.buffer_pos+1] == '.' && | |
2318 | parser.buffer[parser.buffer_pos+2] == '.')) && | |
2319 | is_blankz(parser.buffer, parser.buffer_pos+3) { | |
2320 | yaml_parser_set_scanner_error(parser, "while scanning a quoted scalar", | |
2321 | start_mark, "found unexpected document indicator") | |
2322 | return false | |
2323 | } | |
2324 | ||
2325 | // Check for EOF. | |
2326 | if is_z(parser.buffer, parser.buffer_pos) { | |
2327 | yaml_parser_set_scanner_error(parser, "while scanning a quoted scalar", | |
2328 | start_mark, "found unexpected end of stream") | |
2329 | return false | |
2330 | } | |
2331 | ||
2332 | // Consume non-blank characters. | |
2333 | leading_blanks := false | |
2334 | for !is_blankz(parser.buffer, parser.buffer_pos) { | |
2335 | if single && parser.buffer[parser.buffer_pos] == '\'' && parser.buffer[parser.buffer_pos+1] == '\'' { | |
2336 | // Is is an escaped single quote. | |
2337 | s = append(s, '\'') | |
2338 | skip(parser) | |
2339 | skip(parser) | |
2340 | ||
2341 | } else if single && parser.buffer[parser.buffer_pos] == '\'' { | |
2342 | // It is a right single quote. | |
2343 | break | |
2344 | } else if !single && parser.buffer[parser.buffer_pos] == '"' { | |
2345 | // It is a right double quote. | |
2346 | break | |
2347 | ||
2348 | } else if !single && parser.buffer[parser.buffer_pos] == '\\' && is_break(parser.buffer, parser.buffer_pos+1) { | |
2349 | // It is an escaped line break. | |
2350 | if parser.unread < 3 && !yaml_parser_update_buffer(parser, 3) { | |
2351 | return false | |
2352 | } | |
2353 | skip(parser) | |
2354 | skip_line(parser) | |
2355 | leading_blanks = true | |
2356 | break | |
2357 | ||
2358 | } else if !single && parser.buffer[parser.buffer_pos] == '\\' { | |
2359 | // It is an escape sequence. | |
2360 | code_length := 0 | |
2361 | ||
2362 | // Check the escape character. | |
2363 | switch parser.buffer[parser.buffer_pos+1] { | |
2364 | case '0': | |
2365 | s = append(s, 0) | |
2366 | case 'a': | |
2367 | s = append(s, '\x07') | |
2368 | case 'b': | |
2369 | s = append(s, '\x08') | |
2370 | case 't', '\t': | |
2371 | s = append(s, '\x09') | |
2372 | case 'n': | |
2373 | s = append(s, '\x0A') | |
2374 | case 'v': | |
2375 | s = append(s, '\x0B') | |
2376 | case 'f': | |
2377 | s = append(s, '\x0C') | |
2378 | case 'r': | |
2379 | s = append(s, '\x0D') | |
2380 | case 'e': | |
2381 | s = append(s, '\x1B') | |
2382 | case ' ': | |
2383 | s = append(s, '\x20') | |
2384 | case '"': | |
2385 | s = append(s, '"') | |
2386 | case '\'': | |
2387 | s = append(s, '\'') | |
2388 | case '\\': | |
2389 | s = append(s, '\\') | |
2390 | case 'N': // NEL (#x85) | |
2391 | s = append(s, '\xC2') | |
2392 | s = append(s, '\x85') | |
2393 | case '_': // #xA0 | |
2394 | s = append(s, '\xC2') | |
2395 | s = append(s, '\xA0') | |
2396 | case 'L': // LS (#x2028) | |
2397 | s = append(s, '\xE2') | |
2398 | s = append(s, '\x80') | |
2399 | s = append(s, '\xA8') | |
2400 | case 'P': // PS (#x2029) | |
2401 | s = append(s, '\xE2') | |
2402 | s = append(s, '\x80') | |
2403 | s = append(s, '\xA9') | |
2404 | case 'x': | |
2405 | code_length = 2 | |
2406 | case 'u': | |
2407 | code_length = 4 | |
2408 | case 'U': | |
2409 | code_length = 8 | |
2410 | default: | |
2411 | yaml_parser_set_scanner_error(parser, "while parsing a quoted scalar", | |
2412 | start_mark, "found unknown escape character") | |
2413 | return false | |
2414 | } | |
2415 | ||
2416 | skip(parser) | |
2417 | skip(parser) | |
2418 | ||
2419 | // Consume an arbitrary escape code. | |
2420 | if code_length > 0 { | |
2421 | var value int | |
2422 | ||
2423 | // Scan the character value. | |
2424 | if parser.unread < code_length && !yaml_parser_update_buffer(parser, code_length) { | |
2425 | return false | |
2426 | } | |
2427 | for k := 0; k < code_length; k++ { | |
2428 | if !is_hex(parser.buffer, parser.buffer_pos+k) { | |
2429 | yaml_parser_set_scanner_error(parser, "while parsing a quoted scalar", | |
2430 | start_mark, "did not find expected hexdecimal number") | |
2431 | return false | |
2432 | } | |
2433 | value = (value << 4) + as_hex(parser.buffer, parser.buffer_pos+k) | |
2434 | } | |
2435 | ||
2436 | // Check the value and write the character. | |
2437 | if (value >= 0xD800 && value <= 0xDFFF) || value > 0x10FFFF { | |
2438 | yaml_parser_set_scanner_error(parser, "while parsing a quoted scalar", | |
2439 | start_mark, "found invalid Unicode character escape code") | |
2440 | return false | |
2441 | } | |
2442 | if value <= 0x7F { | |
2443 | s = append(s, byte(value)) | |
2444 | } else if value <= 0x7FF { | |
2445 | s = append(s, byte(0xC0+(value>>6))) | |
2446 | s = append(s, byte(0x80+(value&0x3F))) | |
2447 | } else if value <= 0xFFFF { | |
2448 | s = append(s, byte(0xE0+(value>>12))) | |
2449 | s = append(s, byte(0x80+((value>>6)&0x3F))) | |
2450 | s = append(s, byte(0x80+(value&0x3F))) | |
2451 | } else { | |
2452 | s = append(s, byte(0xF0+(value>>18))) | |
2453 | s = append(s, byte(0x80+((value>>12)&0x3F))) | |
2454 | s = append(s, byte(0x80+((value>>6)&0x3F))) | |
2455 | s = append(s, byte(0x80+(value&0x3F))) | |
2456 | } | |
2457 | ||
2458 | // Advance the pointer. | |
2459 | for k := 0; k < code_length; k++ { | |
2460 | skip(parser) | |
2461 | } | |
2462 | } | |
2463 | } else { | |
2464 | // It is a non-escaped non-blank character. | |
2465 | s = read(parser, s) | |
2466 | } | |
2467 | if parser.unread < 2 && !yaml_parser_update_buffer(parser, 2) { | |
2468 | return false | |
2469 | } | |
2470 | } | |
2471 | ||
2472 | if parser.unread < 1 && !yaml_parser_update_buffer(parser, 1) { | |
2473 | return false | |
2474 | } | |
2475 | ||
2476 | // Check if we are at the end of the scalar. | |
2477 | if single { | |
2478 | if parser.buffer[parser.buffer_pos] == '\'' { | |
2479 | break | |
2480 | } | |
2481 | } else { | |
2482 | if parser.buffer[parser.buffer_pos] == '"' { | |
2483 | break | |
2484 | } | |
2485 | } | |
2486 | ||
2487 | // Consume blank characters. | |
2488 | for is_blank(parser.buffer, parser.buffer_pos) || is_break(parser.buffer, parser.buffer_pos) { | |
2489 | if is_blank(parser.buffer, parser.buffer_pos) { | |
2490 | // Consume a space or a tab character. | |
2491 | if !leading_blanks { | |
2492 | whitespaces = read(parser, whitespaces) | |
2493 | } else { | |
2494 | skip(parser) | |
2495 | } | |
2496 | } else { | |
2497 | if parser.unread < 2 && !yaml_parser_update_buffer(parser, 2) { | |
2498 | return false | |
2499 | } | |
2500 | ||
2501 | // Check if it is a first line break. | |
2502 | if !leading_blanks { | |
2503 | whitespaces = whitespaces[:0] | |
2504 | leading_break = read_line(parser, leading_break) | |
2505 | leading_blanks = true | |
2506 | } else { | |
2507 | trailing_breaks = read_line(parser, trailing_breaks) | |
2508 | } | |
2509 | } | |
2510 | if parser.unread < 1 && !yaml_parser_update_buffer(parser, 1) { | |
2511 | return false | |
2512 | } | |
2513 | } | |
2514 | ||
2515 | // Join the whitespaces or fold line breaks. | |
2516 | if leading_blanks { | |
2517 | // Do we need to fold line breaks? | |
2518 | if len(leading_break) > 0 && leading_break[0] == '\n' { | |
2519 | if len(trailing_breaks) == 0 { | |
2520 | s = append(s, ' ') | |
2521 | } else { | |
2522 | s = append(s, trailing_breaks...) | |
2523 | } | |
2524 | } else { | |
2525 | s = append(s, leading_break...) | |
2526 | s = append(s, trailing_breaks...) | |
2527 | } | |
2528 | trailing_breaks = trailing_breaks[:0] | |
2529 | leading_break = leading_break[:0] | |
2530 | } else { | |
2531 | s = append(s, whitespaces...) | |
2532 | whitespaces = whitespaces[:0] | |
2533 | } | |
2534 | } | |
2535 | ||
2536 | // Eat the right quote. | |
2537 | skip(parser) | |
2538 | end_mark := parser.mark | |
2539 | ||
2540 | // Create a token. | |
2541 | *token = yaml_token_t{ | |
2542 | typ: yaml_SCALAR_TOKEN, | |
2543 | start_mark: start_mark, | |
2544 | end_mark: end_mark, | |
2545 | value: s, | |
2546 | style: yaml_SINGLE_QUOTED_SCALAR_STYLE, | |
2547 | } | |
2548 | if !single { | |
2549 | token.style = yaml_DOUBLE_QUOTED_SCALAR_STYLE | |
2550 | } | |
2551 | return true | |
2552 | } | |
2553 | ||
2554 | // Scan a plain scalar. | |
2555 | func yaml_parser_scan_plain_scalar(parser *yaml_parser_t, token *yaml_token_t) bool { | |
2556 | ||
2557 | var s, leading_break, trailing_breaks, whitespaces []byte | |
2558 | var leading_blanks bool | |
2559 | var indent = parser.indent + 1 | |
2560 | ||
2561 | start_mark := parser.mark | |
2562 | end_mark := parser.mark | |
2563 | ||
2564 | // Consume the content of the plain scalar. | |
2565 | for { | |
2566 | // Check for a document indicator. | |
2567 | if parser.unread < 4 && !yaml_parser_update_buffer(parser, 4) { | |
2568 | return false | |
2569 | } | |
2570 | if parser.mark.column == 0 && | |
2571 | ((parser.buffer[parser.buffer_pos+0] == '-' && | |
2572 | parser.buffer[parser.buffer_pos+1] == '-' && | |
2573 | parser.buffer[parser.buffer_pos+2] == '-') || | |
2574 | (parser.buffer[parser.buffer_pos+0] == '.' && | |
2575 | parser.buffer[parser.buffer_pos+1] == '.' && | |
2576 | parser.buffer[parser.buffer_pos+2] == '.')) && | |
2577 | is_blankz(parser.buffer, parser.buffer_pos+3) { | |
2578 | break | |
2579 | } | |
2580 | ||
2581 | // Check for a comment. | |
2582 | if parser.buffer[parser.buffer_pos] == '#' { | |
2583 | break | |
2584 | } | |
2585 | ||
2586 | // Consume non-blank characters. | |
2587 | for !is_blankz(parser.buffer, parser.buffer_pos) { | |
2588 | ||
2589 | // Check for indicators that may end a plain scalar. | |
2590 | if (parser.buffer[parser.buffer_pos] == ':' && is_blankz(parser.buffer, parser.buffer_pos+1)) || | |
2591 | (parser.flow_level > 0 && | |
2592 | (parser.buffer[parser.buffer_pos] == ',' || | |
2593 | parser.buffer[parser.buffer_pos] == '?' || parser.buffer[parser.buffer_pos] == '[' || | |
2594 | parser.buffer[parser.buffer_pos] == ']' || parser.buffer[parser.buffer_pos] == '{' || | |
2595 | parser.buffer[parser.buffer_pos] == '}')) { | |
2596 | break | |
2597 | } | |
2598 | ||
2599 | // Check if we need to join whitespaces and breaks. | |
2600 | if leading_blanks || len(whitespaces) > 0 { | |
2601 | if leading_blanks { | |
2602 | // Do we need to fold line breaks? | |
2603 | if leading_break[0] == '\n' { | |
2604 | if len(trailing_breaks) == 0 { | |
2605 | s = append(s, ' ') | |
2606 | } else { | |
2607 | s = append(s, trailing_breaks...) | |
2608 | } | |
2609 | } else { | |
2610 | s = append(s, leading_break...) | |
2611 | s = append(s, trailing_breaks...) | |
2612 | } | |
2613 | trailing_breaks = trailing_breaks[:0] | |
2614 | leading_break = leading_break[:0] | |
2615 | leading_blanks = false | |
2616 | } else { | |
2617 | s = append(s, whitespaces...) | |
2618 | whitespaces = whitespaces[:0] | |
2619 | } | |
2620 | } | |
2621 | ||
2622 | // Copy the character. | |
2623 | s = read(parser, s) | |
2624 | ||
2625 | end_mark = parser.mark | |
2626 | if parser.unread < 2 && !yaml_parser_update_buffer(parser, 2) { | |
2627 | return false | |
2628 | } | |
2629 | } | |
2630 | ||
2631 | // Is it the end? | |
2632 | if !(is_blank(parser.buffer, parser.buffer_pos) || is_break(parser.buffer, parser.buffer_pos)) { | |
2633 | break | |
2634 | } | |
2635 | ||
2636 | // Consume blank characters. | |
2637 | if parser.unread < 1 && !yaml_parser_update_buffer(parser, 1) { | |
2638 | return false | |
2639 | } | |
2640 | ||
2641 | for is_blank(parser.buffer, parser.buffer_pos) || is_break(parser.buffer, parser.buffer_pos) { | |
2642 | if is_blank(parser.buffer, parser.buffer_pos) { | |
2643 | ||
2644 | // Check for tab characters that abuse indentation. | |
2645 | if leading_blanks && parser.mark.column < indent && is_tab(parser.buffer, parser.buffer_pos) { | |
2646 | yaml_parser_set_scanner_error(parser, "while scanning a plain scalar", | |
2647 | start_mark, "found a tab character that violates indentation") | |
2648 | return false | |
2649 | } | |
2650 | ||
2651 | // Consume a space or a tab character. | |
2652 | if !leading_blanks { | |
2653 | whitespaces = read(parser, whitespaces) | |
2654 | } else { | |
2655 | skip(parser) | |
2656 | } | |
2657 | } else { | |
2658 | if parser.unread < 2 && !yaml_parser_update_buffer(parser, 2) { | |
2659 | return false | |
2660 | } | |
2661 | ||
2662 | // Check if it is a first line break. | |
2663 | if !leading_blanks { | |
2664 | whitespaces = whitespaces[:0] | |
2665 | leading_break = read_line(parser, leading_break) | |
2666 | leading_blanks = true | |
2667 | } else { | |
2668 | trailing_breaks = read_line(parser, trailing_breaks) | |
2669 | } | |
2670 | } | |
2671 | if parser.unread < 1 && !yaml_parser_update_buffer(parser, 1) { | |
2672 | return false | |
2673 | } | |
2674 | } | |
2675 | ||
2676 | // Check indentation level. | |
2677 | if parser.flow_level == 0 && parser.mark.column < indent { | |
2678 | break | |
2679 | } | |
2680 | } | |
2681 | ||
2682 | // Create a token. | |
2683 | *token = yaml_token_t{ | |
2684 | typ: yaml_SCALAR_TOKEN, | |
2685 | start_mark: start_mark, | |
2686 | end_mark: end_mark, | |
2687 | value: s, | |
2688 | style: yaml_PLAIN_SCALAR_STYLE, | |
2689 | } | |
2690 | ||
2691 | // Note that we change the 'simple_key_allowed' flag. | |
2692 | if leading_blanks { | |
2693 | parser.simple_key_allowed = true | |
2694 | } | |
2695 | return true | |
2696 | } |