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[libyaml.git] / src / emitter.c
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cf616166
KS		 1
2#include "yaml_private.h"
3
e35af832
KS		 4/*
5 * Flush the buffer if needed.
6 */
7
8#define FLUSH(emitter) \
9 ((emitter->buffer.pointer+5 < emitter->buffer.end) \
10 || yaml_emitter_flush(emitter))
11
12/*
13 * Put a character to the output buffer.
14 */
15
16#define PUT(emitter,value) \
17 (FLUSH(emitter) \
18 && (*(emitter->buffer.pointer++) = (yaml_char_t)(value), \
19 emitter->column ++, \
20 1))
21
22/*
23 * Put a line break to the output buffer.
24 */
25
26#define PUT_BREAK(emitter) \
27 (FLUSH(emitter) \
28 && ((emitter->line_break == YAML_CR_BREAK ? \
29 (*(emitter->buffer.pointer++) = (yaml_char_t) '\r') : \
30 emitter->line_break == YAML_LN_BREAK ? \
31 (*(emitter->buffer.pointer++) = (yaml_char_t) '\n') : \
32 emitter->line_break == YAML_CRLN_BREAK ? \
33 (*(emitter->buffer.pointer++) = (yaml_char_t) '\r', \
34 *(emitter->buffer.pointer++) = (yaml_char_t) '\n') : 0), \
35 emitter->column = 0, \
36 emitter->line ++, \
37 1))
38
39/*
40 * Copy a character from a string into buffer.
41 */
42
43#define WRITE(emitter,string) \
44 (FLUSH(emitter) \
45 && (COPY(emitter->buffer,string), \
46 emitter->column ++, \
47 1))
48
49/*
50 * Copy a line break character from a string into buffer.
51 */
52
53#define WRITE_BREAK(emitter,string) \
54 (FLUSH(emitter) \
784340c2
KS		 55 && (CHECK(string,'\n') ? \
56 (PUT_BREAK(emitter), \
57 string.pointer ++, \
58 1) : \
59 (COPY(emitter->buffer,string), \
60 emitter->column = 0, \
61 emitter->line ++, \
62 1)))
e35af832 63
cf616166
KS		 64/*
65 * API functions.
66 */
67
68YAML_DECLARE(int)
69yaml_emitter_emit(yaml_emitter_t *emitter, yaml_event_t *event);
70
5a00d8fe
KS		 71/*
72 * Utility functions.
73 */
cf616166 74
5a00d8fe
KS		 75static int
76yaml_emitter_set_emitter_error(yaml_emitter_t *emitter, const char *problem);
cf616166 77
5a00d8fe
KS		 78static int
79yaml_emitter_need_more_events(yaml_emitter_t *emitter);
80
81static int
82yaml_emitter_append_tag_directive(yaml_emitter_t *emitter,
83 yaml_tag_directive_t value, int allow_duplicates);
84
85static int
86yaml_emitter_increase_indent(yaml_emitter_t *emitter,
87 int flow, int indentless);
88
89/*
90 * State functions.
91 */
92
93static int
94yaml_emitter_state_machine(yaml_emitter_t *emitter, yaml_event_t *event);
95
96static int
97yaml_emitter_emit_stream_start(yaml_emitter_t *emitter,
98 yaml_event_t *event);
99
100static int
cf616166 101yaml_emitter_emit_document_start(yaml_emitter_t *emitter,
5a00d8fe 102 yaml_event_t *event, int first);
cf616166 103
5a00d8fe
KS		 104static int
105yaml_emitter_emit_document_content(yaml_emitter_t *emitter,
106 yaml_event_t *event);
cf616166 107
5a00d8fe
KS		 108static int
109yaml_emitter_emit_document_end(yaml_emitter_t *emitter,
110 yaml_event_t *event);
cf616166 111
5a00d8fe
KS		 112static int
113yaml_emitter_emit_flow_sequence_item(yaml_emitter_t *emitter,
114 yaml_event_t *event, int first);
115
116static int
117yaml_emitter_emit_flow_mapping_key(yaml_emitter_t *emitter,
118 yaml_event_t *event, int first);
119
120static int
121yaml_emitter_emit_flow_mapping_value(yaml_emitter_t *emitter,
122 yaml_event_t *event, int simple);
123
124static int
125yaml_emitter_emit_block_sequence_item(yaml_emitter_t *emitter,
126 yaml_event_t *event, int first);
127
128static int
129yaml_emitter_emit_block_mapping_key(yaml_emitter_t *emitter,
130 yaml_event_t *event, int first);
131
132static int
133yaml_emitter_emit_block_mapping_value(yaml_emitter_t *emitter,
134 yaml_event_t *event, int simple);
135
136static int
137yaml_emitter_emit_node(yaml_emitter_t *emitter, yaml_event_t *event,
138 int root, int sequence, int mapping, int simple_key);
139
140static int
141yaml_emitter_emit_alias(yaml_emitter_t *emitter, yaml_event_t *event);
142
143static int
144yaml_emitter_emit_scalar(yaml_emitter_t *emitter, yaml_event_t *event);
145
146static int
147yaml_emitter_emit_sequence_start(yaml_emitter_t *emitter, yaml_event_t *event);
148
149static int
150yaml_emitter_emit_mapping_start(yaml_emitter_t *emitter, yaml_event_t *event);
151
152/*
153 * Checkers.
154 */
155
156static int
157yaml_emitter_check_empty_document(yaml_emitter_t *emitter);
158
159static int
160yaml_emitter_check_empty_sequence(yaml_emitter_t *emitter);
161
162static int
163yaml_emitter_check_empty_mapping(yaml_emitter_t *emitter);
164
165static int
166yaml_emitter_check_simple_key(yaml_emitter_t *emitter);
167
e35af832
KS		 168static int
169yaml_emitter_select_scalar_style(yaml_emitter_t *emitter, yaml_event_t *event);
170
5a00d8fe
KS		 171/*
172 * Processors.
173 */
174
175static int
e35af832 176yaml_emitter_process_anchor(yaml_emitter_t *emitter);
5a00d8fe
KS		 177
178static int
e35af832 179yaml_emitter_process_tag(yaml_emitter_t *emitter);
5a00d8fe
KS		 180
181static int
e35af832 182yaml_emitter_process_scalar(yaml_emitter_t *emitter);
cf616166 183
5a00d8fe 184/*
e35af832 185 * Analyzers.
5a00d8fe 186 */
cf616166 187
5a00d8fe 188static int
e35af832 189yaml_emitter_analyze_version_directive(yaml_emitter_t *emitter,
5a00d8fe 190 yaml_version_directive_t version_directive);
cf616166 191
5a00d8fe 192static int
e35af832 193yaml_emitter_analyze_tag_directive(yaml_emitter_t *emitter,
5a00d8fe
KS		 194 yaml_tag_directive_t tag_directive);
195
e35af832
KS		 196static int
197yaml_emitter_analyze_anchor(yaml_emitter_t *emitter,
198 yaml_char_t *anchor, int alias);
199
200static int
201yaml_emitter_analyze_tag(yaml_emitter_t *emitter,
202 yaml_char_t *tag);
203
204static int
205yaml_emitter_analyze_scalar(yaml_emitter_t *emitter,
206 yaml_char_t *value, size_t length);
207
208static int
209yaml_emitter_analyze_event(yaml_emitter_t *emitter,
210 yaml_event_t *event);
211
212/*
213 * Writers.
214 */
215
216static int
217yaml_emitter_write_bom(yaml_emitter_t *emitter);
218
5a00d8fe
KS		 219static int
220yaml_emitter_write_indent(yaml_emitter_t *emitter);
221
222static int
223yaml_emitter_write_indicator(yaml_emitter_t *emitter,
224 char *indicator, int need_whitespace,
225 int is_whitespace, int is_indention);
cf616166 226
e35af832
KS		 227static int
228yaml_emitter_write_anchor(yaml_emitter_t *emitter,
229 yaml_char_t *value, size_t length);
230
231static int
232yaml_emitter_write_tag_handle(yaml_emitter_t *emitter,
233 yaml_char_t *value, size_t length);
234
235static int
236yaml_emitter_write_tag_content(yaml_emitter_t *emitter,
784340c2 237 yaml_char_t *value, size_t length, int need_whitespace);
e35af832
KS		 238
239static int
240yaml_emitter_write_plain_scalar(yaml_emitter_t *emitter,
241 yaml_char_t *value, size_t length, int allow_breaks);
242
243static int
244yaml_emitter_write_single_quoted_scalar(yaml_emitter_t *emitter,
245 yaml_char_t *value, size_t length, int allow_breaks);
246
247static int
248yaml_emitter_write_double_quoted_scalar(yaml_emitter_t *emitter,
249 yaml_char_t *value, size_t length, int allow_breaks);
250
784340c2
KS		 251static int
252yaml_emitter_determine_chomping(yaml_emitter_t *emitter,
253 yaml_string_t string);
254
e35af832
KS		 255static int
256yaml_emitter_write_literal_scalar(yaml_emitter_t *emitter,
257 yaml_char_t *value, size_t length);
258
259static int
260yaml_emitter_write_folded_scalar(yaml_emitter_t *emitter,
261 yaml_char_t *value, size_t length);
262
cf616166 263/*
5a00d8fe 264 * Set an emitter error and return 0.
cf616166
KS		 265 */
266
5a00d8fe
KS		 267static int
268yaml_emitter_set_emitter_error(yaml_emitter_t *emitter, const char *problem)
cf616166 269{
5a00d8fe
KS		 270 emitter->error = YAML_EMITTER_ERROR;
271 emitter->problem = problem;
cf616166 272
5a00d8fe 273 return 0;
cf616166
KS		 274}
275
276/*
5a00d8fe 277 * Emit an event.
cf616166
KS		 278 */
279
280YAML_DECLARE(int)
5a00d8fe 281yaml_emitter_emit(yaml_emitter_t *emitter, yaml_event_t *event)
cf616166 282{
5a00d8fe
KS		 283 if (!ENQUEUE(emitter, emitter->events, *event)) {
284 yaml_event_delete(event);
285 return 0;
286 }
cf616166 287
5a00d8fe 288 while (!yaml_emitter_need_more_events(emitter)) {
e35af832
KS		 289 if (!yaml_emitter_analyze_event(emitter, emitter->events.head))
290 return 0;
291 if (!yaml_emitter_state_machine(emitter, emitter->events.head))
5a00d8fe 292 return 0;
6d167281 293 yaml_event_delete(&DEQUEUE(emitter, emitter->events));
5a00d8fe 294 }
cf616166 295
5a00d8fe 296 return 1;
cf616166
KS		 297}
298
299/*
5a00d8fe
KS		 300 * Check if we need to accumulate more events before emitting.
301 *
302 * We accumulate extra
303 * - 1 event for DOCUMENT-START
304 * - 2 events for SEQUENCE-START
305 * - 3 events for MAPPING-START
cf616166
KS		 306 */
307
5a00d8fe
KS		 308static int
309yaml_emitter_need_more_events(yaml_emitter_t *emitter)
cf616166 310{
5a00d8fe
KS		 311 int level = 0;
312 int accumulate = 0;
313 yaml_event_t *event;
314
315 if (QUEUE_EMPTY(emitter, emitter->events))
316 return 1;
317
318 switch (emitter->events.head->type) {
319 case YAML_DOCUMENT_START_EVENT:
320 accumulate = 1;
321 break;
322 case YAML_SEQUENCE_START_EVENT:
323 accumulate = 2;
324 break;
325 case YAML_MAPPING_START_EVENT:
326 accumulate = 3;
327 break;
328 default:
329 return 0;
cf616166
KS		 330 }
331
5a00d8fe
KS		 332 if (emitter->events.tail - emitter->events.head > accumulate)
333 return 0;
334
335 for (event = emitter->events.head; event != emitter->events.tail; event ++) {
336 switch (event->type) {
337 case YAML_STREAM_START_EVENT:
338 case YAML_DOCUMENT_START_EVENT:
339 case YAML_SEQUENCE_START_EVENT:
340 case YAML_MAPPING_START_EVENT:
341 level += 1;
342 break;
343 case YAML_STREAM_END_EVENT:
344 case YAML_DOCUMENT_END_EVENT:
345 case YAML_SEQUENCE_END_EVENT:
346 case YAML_MAPPING_END_EVENT:
347 level -= 1;
348 break;
349 default:
350 break;
cf616166 351 }
5a00d8fe
KS		 352 if (!level)
353 return 0;
cf616166
KS		 354 }
355
5a00d8fe
KS		 356 return 1;
357}
cf616166 358
5a00d8fe
KS		 359/*
360 * Append a directive to the directives stack.
361 */
362
363static int
364yaml_emitter_append_tag_directive(yaml_emitter_t *emitter,
365 yaml_tag_directive_t value, int allow_duplicates)
366{
367 yaml_tag_directive_t *tag_directive;
368 yaml_tag_directive_t copy = { NULL, NULL };
369
370 for (tag_directive = emitter->tag_directives.start;
371 tag_directive != emitter->tag_directives.top; tag_directive ++) {
372 if (strcmp((char *)value.handle, (char *)tag_directive->handle) == 0) {
373 if (allow_duplicates)
374 return 1;
375 return yaml_emitter_set_emitter_error(emitter,
376 "duplicate %TAG directive");
377 }
cf616166
KS		 378 }
379
5a00d8fe
KS		 380 copy.handle = yaml_strdup(value.handle);
381 copy.prefix = yaml_strdup(value.prefix);
382 if (!copy.handle || !copy.prefix) {
383 emitter->error = YAML_MEMORY_ERROR;
384 goto error;
cf616166 385 }
cf616166 386
5a00d8fe
KS		 387 if (!PUSH(emitter, emitter->tag_directives, copy))
388 goto error;
389
390 return 1;
391
392error:
393 yaml_free(copy.handle);
394 yaml_free(copy.prefix);
cf616166
KS		 395 return 0;
396}
397
398/*
5a00d8fe 399 * Increase the indentation level.
cf616166
KS		 400 */
401
5a00d8fe
KS		 402static int
403yaml_emitter_increase_indent(yaml_emitter_t *emitter,
404 int flow, int indentless)
cf616166 405{
5a00d8fe
KS		 406 if (!PUSH(emitter, emitter->indents, emitter->indent))
407 return 0;
cf616166 408
5a00d8fe
KS		 409 if (emitter->indent < 0) {
410 emitter->indent = flow ? emitter->best_indent : 0;
411 }
412 else if (!indentless) {
413 emitter->indent += emitter->best_indent;
414 }
cf616166 415
5a00d8fe 416 return 1;
cf616166
KS		 417}
418
419/*
5a00d8fe 420 * State dispatcher.
cf616166
KS		 421 */
422
5a00d8fe
KS		 423static int
424yaml_emitter_state_machine(yaml_emitter_t *emitter, yaml_event_t *event)
cf616166 425{
5a00d8fe
KS		 426 switch (emitter->state)
427 {
428 case YAML_EMIT_STREAM_START_STATE:
429 return yaml_emitter_emit_stream_start(emitter, event);
cf616166 430
5a00d8fe
KS		 431 case YAML_EMIT_FIRST_DOCUMENT_START_STATE:
432 return yaml_emitter_emit_document_start(emitter, event, 1);
cf616166 433
5a00d8fe
KS		 434 case YAML_EMIT_DOCUMENT_START_STATE:
435 return yaml_emitter_emit_document_start(emitter, event, 0);
cf616166 436
5a00d8fe
KS		 437 case YAML_EMIT_DOCUMENT_CONTENT_STATE:
438 return yaml_emitter_emit_document_content(emitter, event);
cf616166 439
5a00d8fe
KS		 440 case YAML_EMIT_DOCUMENT_END_STATE:
441 return yaml_emitter_emit_document_end(emitter, event);
442
443 case YAML_EMIT_FLOW_SEQUENCE_FIRST_ITEM_STATE:
444 return yaml_emitter_emit_flow_sequence_item(emitter, event, 1);
445
446 case YAML_EMIT_FLOW_SEQUENCE_ITEM_STATE:
447 return yaml_emitter_emit_flow_sequence_item(emitter, event, 0);
448
449 case YAML_EMIT_FLOW_MAPPING_FIRST_KEY_STATE:
450 return yaml_emitter_emit_flow_mapping_key(emitter, event, 1);
451
452 case YAML_EMIT_FLOW_MAPPING_KEY_STATE:
453 return yaml_emitter_emit_flow_mapping_key(emitter, event, 0);
454
455 case YAML_EMIT_FLOW_MAPPING_SIMPLE_VALUE_STATE:
456 return yaml_emitter_emit_flow_mapping_value(emitter, event, 1);
457
458 case YAML_EMIT_FLOW_MAPPING_VALUE_STATE:
459 return yaml_emitter_emit_flow_mapping_value(emitter, event, 0);
cf616166 460
5a00d8fe
KS		 461 case YAML_EMIT_BLOCK_SEQUENCE_FIRST_ITEM_STATE:
462 return yaml_emitter_emit_block_sequence_item(emitter, event, 1);
463
464 case YAML_EMIT_BLOCK_SEQUENCE_ITEM_STATE:
465 return yaml_emitter_emit_block_sequence_item(emitter, event, 0);
466
467 case YAML_EMIT_BLOCK_MAPPING_FIRST_KEY_STATE:
468 return yaml_emitter_emit_block_mapping_key(emitter, event, 1);
469
470 case YAML_EMIT_BLOCK_MAPPING_KEY_STATE:
471 return yaml_emitter_emit_block_mapping_key(emitter, event, 0);
472
473 case YAML_EMIT_BLOCK_MAPPING_SIMPLE_VALUE_STATE:
474 return yaml_emitter_emit_block_mapping_value(emitter, event, 1);
475
476 case YAML_EMIT_BLOCK_MAPPING_VALUE_STATE:
477 return yaml_emitter_emit_block_mapping_value(emitter, event, 0);
478
479 case YAML_EMIT_END_STATE:
480 return yaml_emitter_set_emitter_error(emitter,
481 "expected nothing after STREAM-END");
482
483 default:
484 assert(1); /* Invalid state. */
485 }
cf616166
KS		 486
487 return 0;
488}
489
490/*
5a00d8fe 491 * Expect STREAM-START.
cf616166
KS		 492 */
493
5a00d8fe
KS		 494static int
495yaml_emitter_emit_stream_start(yaml_emitter_t *emitter,
496 yaml_event_t *event)
cf616166 497{
5a00d8fe
KS		 498 if (event->type == YAML_STREAM_START_EVENT)
499 {
500 if (!emitter->encoding) {
501 emitter->encoding = event->data.stream_start.encoding;
cf616166 502 }
cf616166 503
5a00d8fe
KS		 504 if (!emitter->encoding) {
505 emitter->encoding = YAML_UTF8_ENCODING;
cf616166 506 }
cf616166 507
5a00d8fe
KS		 508 if (emitter->best_indent < 2 || emitter->best_indent > 9) {
509 emitter->best_indent = 2;
510 }
511
512 if (emitter->best_width >= 0
513 && emitter->best_width <= emitter->best_indent*2) {
514 emitter->best_width = 80;
515 }
516
517 if (emitter->best_width < 0) {
518 emitter->best_width = INT_MAX;
519 }
520
521 if (!emitter->line_break) {
522 emitter->line_break = YAML_LN_BREAK;
523 }
524
525 emitter->indent = -1;
526
527 emitter->line = 0;
528 emitter->column = 0;
529 emitter->whitespace = 1;
530 emitter->indention = 1;
531
532 if (emitter->encoding != YAML_UTF8_ENCODING) {
533 if (!yaml_emitter_write_bom(emitter))
534 return 0;
535 }
536
537 emitter->state = YAML_EMIT_FIRST_DOCUMENT_START_STATE;
538
539 return 1;
cf616166 540 }
cf616166 541
5a00d8fe
KS		 542 return yaml_emitter_set_emitter_error(emitter,
543 "expected STREAM-START");
544}
545
e35af832
KS		 546/*
547 * Expect DOCUMENT-START or STREAM-END.
548 */
549
5a00d8fe
KS		 550static int
551yaml_emitter_emit_document_start(yaml_emitter_t *emitter,
552 yaml_event_t *event, int first)
553{
554 if (event->type == YAML_DOCUMENT_START_EVENT)
555 {
556 yaml_tag_directive_t default_tag_directives[] = {
557 {(yaml_char_t *)"!", (yaml_char_t *)"!"},
558 {(yaml_char_t *)"!!", (yaml_char_t *)"tag:yaml.org,2002:"},
559 {NULL, NULL}
560 };
561 yaml_tag_directive_t *tag_directive;
562 int implicit;
563
564 if (event->data.document_start.version_directive) {
e35af832
KS		 565 if (!yaml_emitter_analyze_version_directive(emitter,
566 *event->data.document_start.version_directive))
567 return 0;
5a00d8fe
KS		 568 }
569
570 for (tag_directive = event->data.document_start.tag_directives.start;
571 tag_directive != event->data.document_start.tag_directives.end;
572 tag_directive ++) {
e35af832
KS		 573 if (!yaml_emitter_analyze_tag_directive(emitter, *tag_directive))
574 return 0;
5a00d8fe
KS		 575 if (!yaml_emitter_append_tag_directive(emitter, *tag_directive, 0))
576 return 0;
577 }
578
579 for (tag_directive = default_tag_directives;
580 tag_directive->handle; tag_directive ++) {
581 if (!yaml_emitter_append_tag_directive(emitter, *tag_directive, 1))
582 return 0;
583 }
584
585 implicit = event->data.document_start.implicit;
586 if (!first || emitter->canonical) {
587 implicit = 0;
588 }
589
590 if (event->data.document_start.version_directive) {
591 implicit = 0;
e35af832
KS		 592 if (!yaml_emitter_write_indicator(emitter, "%YAML", 1, 0, 0))
593 return 0;
594 if (!yaml_emitter_write_indicator(emitter, "1.1", 1, 0, 0))
595 return 0;
596 if (!yaml_emitter_write_indent(emitter))
5a00d8fe
KS		 597 return 0;
598 }
599
600 if (event->data.document_start.tag_directives.start
601 != event->data.document_start.tag_directives.end) {
602 implicit = 0;
603 for (tag_directive = event->data.document_start.tag_directives.start;
604 tag_directive != event->data.document_start.tag_directives.end;
605 tag_directive ++) {
e35af832
KS		 606 if (!yaml_emitter_write_indicator(emitter, "%TAG", 1, 0, 0))
607 return 0;
608 if (!yaml_emitter_write_tag_handle(emitter, tag_directive->handle,
609 strlen((char *)tag_directive->handle)))
610 return 0;
611 if (!yaml_emitter_write_tag_content(emitter, tag_directive->prefix,
784340c2 612 strlen((char *)tag_directive->prefix), 1))
e35af832
KS		 613 return 0;
614 if (!yaml_emitter_write_indent(emitter))
5a00d8fe
KS		 615 return 0;
616 }
617 }
618
619 if (yaml_emitter_check_empty_document(emitter)) {
620 implicit = 0;
621 }
622
623 if (!implicit) {
624 if (!yaml_emitter_write_indent(emitter))
625 return 0;
626 if (!yaml_emitter_write_indicator(emitter, "---", 1, 0, 0))
627 return 0;
628 if (emitter->canonical) {
629 if (!yaml_emitter_write_indent(emitter))
630 return 0;
631 }
632 }
633
634 emitter->state = YAML_EMIT_DOCUMENT_CONTENT_STATE;
cf616166 635
cf616166
KS		 636 return 1;
637 }
638
5a00d8fe
KS		 639 else if (event->type == YAML_STREAM_END_EVENT)
640 {
641 if (!yaml_emitter_flush(emitter))
642 return 0;
cf616166 643
5a00d8fe
KS		 644 emitter->state = YAML_EMIT_END_STATE;
645
646 return 1;
647 }
648
649 return yaml_emitter_set_emitter_error(emitter,
650 "expected DOCUMENT-START or STREAM-END");
cf616166
KS		 651}
652
e35af832
KS		 653/*
654 * Expect the root node.
655 */
656
5a00d8fe
KS		 657static int
658yaml_emitter_emit_document_content(yaml_emitter_t *emitter,
659 yaml_event_t *event)
660{
661 if (!PUSH(emitter, emitter->states, YAML_EMIT_DOCUMENT_END_STATE))
662 return 0;
cf616166 663
5a00d8fe
KS		 664 return yaml_emitter_emit_node(emitter, event, 1, 0, 0, 0);
665}
666
e35af832
KS		 667/*
668 * Expect DOCUMENT-END.
669 */
670
5a00d8fe
KS		 671static int
672yaml_emitter_emit_document_end(yaml_emitter_t *emitter,
673 yaml_event_t *event)
cf616166 674{
5a00d8fe
KS		 675 if (event->type == YAML_DOCUMENT_END_EVENT)
676 {
677 if (!yaml_emitter_write_indent(emitter))
678 return 0;
679 if (!event->data.document_end.implicit) {
680 if (!yaml_emitter_write_indicator(emitter, "...", 1, 0, 0))
681 return 0;
682 if (!yaml_emitter_write_indent(emitter))
683 return 0;
cf616166 684 }
5a00d8fe
KS		 685 if (!yaml_emitter_flush(emitter))
686 return 0;
687
688 emitter->state = YAML_EMIT_DOCUMENT_START_STATE;
689
6d167281
KS		 690 while (!STACK_EMPTY(emitter, emitter->tag_directives)) {
691 yaml_tag_directive_t tag_directive = POP(emitter,
692 emitter->tag_directives);
693 yaml_free(tag_directive.handle);
694 yaml_free(tag_directive.prefix);
695 }
696
5a00d8fe 697 return 1;
cf616166
KS		 698 }
699
5a00d8fe
KS		 700 return yaml_emitter_set_emitter_error(emitter,
701 "expected DOCUMENT-END");
702}
703
e35af832 704/*
6d167281 705 *
e35af832
KS		 706 * Expect a flow item node.
707 */
708
5a00d8fe
KS		 709static int
710yaml_emitter_emit_flow_sequence_item(yaml_emitter_t *emitter,
711 yaml_event_t *event, int first)
712{
713 if (first)
714 {
715 if (!yaml_emitter_write_indicator(emitter, "[", 1, 1, 0))
716 return 0;
717 if (!yaml_emitter_increase_indent(emitter, 1, 0))
718 return 0;
719 emitter->flow_level ++;
cf616166
KS		 720 }
721
5a00d8fe
KS		 722 if (event->type == YAML_SEQUENCE_END_EVENT)
723 {
724 emitter->flow_level --;
725 emitter->indent = POP(emitter, emitter->indents);
726 if (emitter->canonical && !first) {
727 if (!yaml_emitter_write_indicator(emitter, ",", 0, 0, 0))
728 return 0;
729 if (!yaml_emitter_write_indent(emitter))
730 return 0;
731 }
732 if (!yaml_emitter_write_indicator(emitter, "]", 0, 0, 0))
733 return 0;
734 emitter->state = POP(emitter, emitter->states);
cf616166 735
cf616166
KS		 736 return 1;
737 }
738
6d167281
KS		 739 if (!first) {
740 if (!yaml_emitter_write_indicator(emitter, ",", 0, 0, 0))
741 return 0;
742 }
743
5a00d8fe
KS		 744 if (emitter->canonical || emitter->column > emitter->best_width) {
745 if (!yaml_emitter_write_indent(emitter))
746 return 0;
747 }
6d167281 748 if (!PUSH(emitter, emitter->states, YAML_EMIT_FLOW_SEQUENCE_ITEM_STATE))
5a00d8fe 749 return 0;
cf616166 750
5a00d8fe 751 return yaml_emitter_emit_node(emitter, event, 0, 1, 0, 0);
cf616166
KS		 752}
753
e35af832
KS		 754/*
755 * Expect a flow key node.
756 */
757
5a00d8fe
KS		 758static int
759yaml_emitter_emit_flow_mapping_key(yaml_emitter_t *emitter,
760 yaml_event_t *event, int first)
cf616166 761{
5a00d8fe
KS		 762 if (first)
763 {
764 if (!yaml_emitter_write_indicator(emitter, "{", 1, 1, 0))
765 return 0;
766 if (!yaml_emitter_increase_indent(emitter, 1, 0))
767 return 0;
768 emitter->flow_level ++;
769 }
cf616166 770
5a00d8fe
KS		 771 if (event->type == YAML_MAPPING_END_EVENT)
772 {
773 emitter->flow_level --;
774 emitter->indent = POP(emitter, emitter->indents);
775 if (emitter->canonical && !first) {
776 if (!yaml_emitter_write_indicator(emitter, ",", 0, 0, 0))
777 return 0;
778 if (!yaml_emitter_write_indent(emitter))
779 return 0;
780 }
781 if (!yaml_emitter_write_indicator(emitter, "}", 0, 0, 0))
782 return 0;
783 emitter->state = POP(emitter, emitter->states);
cf616166 784
5a00d8fe
KS		 785 return 1;
786 }
cf616166 787
5a00d8fe
KS		 788 if (!first) {
789 if (!yaml_emitter_write_indicator(emitter, ",", 0, 0, 0))
790 return 0;
791 }
792 if (emitter->canonical || emitter->column > emitter->best_width) {
793 if (!yaml_emitter_write_indent(emitter))
794 return 0;
795 }
cf616166 796
5a00d8fe
KS		 797 if (!emitter->canonical && yaml_emitter_check_simple_key(emitter))
798 {
799 if (!PUSH(emitter, emitter->states,
800 YAML_EMIT_FLOW_MAPPING_SIMPLE_VALUE_STATE))
801 return 0;
cf616166 802
5a00d8fe
KS		 803 return yaml_emitter_emit_node(emitter, event, 0, 0, 1, 1);
804 }
805 else
806 {
807 if (!yaml_emitter_write_indicator(emitter, "?", 1, 0, 0))
808 return 0;
809 if (!PUSH(emitter, emitter->states,
810 YAML_EMIT_FLOW_MAPPING_VALUE_STATE))
811 return 0;
812
813 return yaml_emitter_emit_node(emitter, event, 0, 0, 1, 0);
814 }
815}
816
e35af832
KS		 817/*
818 * Expect a flow value node.
819 */
820
5a00d8fe
KS		 821static int
822yaml_emitter_emit_flow_mapping_value(yaml_emitter_t *emitter,
823 yaml_event_t *event, int simple)
cf616166 824{
5a00d8fe
KS		 825 if (simple) {
826 if (!yaml_emitter_write_indicator(emitter, ":", 0, 0, 0))
827 return 0;
828 }
829 else {
830 if (emitter->canonical || emitter->column > emitter->best_width) {
831 if (!yaml_emitter_write_indent(emitter))
832 return 0;
cf616166 833 }
5a00d8fe
KS		 834 if (!yaml_emitter_write_indicator(emitter, ":", 1, 0, 0))
835 return 0;
cf616166 836 }
5a00d8fe
KS		 837 if (!PUSH(emitter, emitter->states, YAML_EMIT_FLOW_MAPPING_KEY_STATE))
838 return 0;
839 return yaml_emitter_emit_node(emitter, event, 0, 0, 1, 0);
840}
cf616166 841
e35af832
KS		 842/*
843 * Expect a block item node.
844 */
845
5a00d8fe
KS		 846static int
847yaml_emitter_emit_block_sequence_item(yaml_emitter_t *emitter,
848 yaml_event_t *event, int first)
849{
850 if (first)
851 {
852 if (!yaml_emitter_increase_indent(emitter, 0,
853 (emitter->mapping_context && !emitter->indention)))
854 return 0;
cf616166
KS		 855 }
856
5a00d8fe
KS		 857 if (event->type == YAML_SEQUENCE_END_EVENT)
858 {
859 emitter->indent = POP(emitter, emitter->indents);
860 emitter->state = POP(emitter, emitter->states);
cf616166 861
cf616166
KS		 862 return 1;
863 }
864
5a00d8fe
KS		 865 if (!yaml_emitter_write_indent(emitter))
866 return 0;
867 if (!yaml_emitter_write_indicator(emitter, "-", 1, 0, 1))
868 return 0;
869 if (!PUSH(emitter, emitter->states,
870 YAML_EMIT_BLOCK_SEQUENCE_ITEM_STATE))
871 return 0;
cf616166 872
5a00d8fe 873 return yaml_emitter_emit_node(emitter, event, 0, 1, 0, 0);
cf616166
KS		 874}
875
e35af832
KS		 876/*
877 * Expect a block key node.
878 */
879
5a00d8fe
KS		 880static int
881yaml_emitter_emit_block_mapping_key(yaml_emitter_t *emitter,
882 yaml_event_t *event, int first)
cf616166 883{
5a00d8fe
KS		 884 if (first)
885 {
886 if (!yaml_emitter_increase_indent(emitter, 0, 0))
887 return 0;
888 }
889
890 if (event->type == YAML_MAPPING_END_EVENT)
891 {
892 emitter->indent = POP(emitter, emitter->indents);
893 emitter->state = POP(emitter, emitter->states);
894
895 return 1;
896 }
cf616166 897
5a00d8fe
KS		 898 if (!yaml_emitter_write_indent(emitter))
899 return 0;
cf616166 900
5a00d8fe
KS		 901 if (yaml_emitter_check_simple_key(emitter))
902 {
903 if (!PUSH(emitter, emitter->states,
904 YAML_EMIT_BLOCK_MAPPING_SIMPLE_VALUE_STATE))
905 return 0;
cf616166 906
5a00d8fe
KS		 907 return yaml_emitter_emit_node(emitter, event, 0, 0, 1, 1);
908 }
909 else
910 {
911 if (!yaml_emitter_write_indicator(emitter, "?", 1, 0, 1))
912 return 0;
913 if (!PUSH(emitter, emitter->states,
914 YAML_EMIT_BLOCK_MAPPING_VALUE_STATE))
915 return 0;
916
917 return yaml_emitter_emit_node(emitter, event, 0, 0, 1, 0);
918 }
cf616166
KS		 919}
920
e35af832
KS		 921/*
922 * Expect a block value node.
923 */
924
5a00d8fe
KS		 925static int
926yaml_emitter_emit_block_mapping_value(yaml_emitter_t *emitter,
927 yaml_event_t *event, int simple)
928{
929 if (simple) {
930 if (!yaml_emitter_write_indicator(emitter, ":", 0, 0, 0))
931 return 0;
932 }
933 else {
934 if (!yaml_emitter_write_indent(emitter))
935 return 0;
936 if (!yaml_emitter_write_indicator(emitter, ":", 1, 0, 1))
937 return 0;
938 }
939 if (!PUSH(emitter, emitter->states,
940 YAML_EMIT_BLOCK_MAPPING_KEY_STATE))
941 return 0;
cf616166 942
5a00d8fe
KS		 943 return yaml_emitter_emit_node(emitter, event, 0, 0, 1, 0);
944}
945
e35af832
KS		 946/*
947 * Expect a node.
948 */
949
5a00d8fe
KS		 950static int
951yaml_emitter_emit_node(yaml_emitter_t *emitter, yaml_event_t *event,
952 int root, int sequence, int mapping, int simple_key)
cf616166 953{
5a00d8fe
KS		 954 emitter->root_context = root;
955 emitter->sequence_context = sequence;
956 emitter->mapping_context = mapping;
957 emitter->simple_key_context = simple_key;
958
959 switch (event->type)
960 {
961 case YAML_ALIAS_EVENT:
962 return yaml_emitter_emit_alias(emitter, event);
963
964 case YAML_SCALAR_EVENT:
965 return yaml_emitter_emit_scalar(emitter, event);
966
967 case YAML_SEQUENCE_START_EVENT:
968 return yaml_emitter_emit_sequence_start(emitter, event);
969
970 case YAML_MAPPING_START_EVENT:
971 return yaml_emitter_emit_mapping_start(emitter, event);
972
973 default:
974 return yaml_emitter_set_emitter_error(emitter,
975 "expected SCALAR, SEQUENCE-START, MAPPING-START, or ALIAS");
976 }
977
cf616166
KS		 978 return 0;
979}
980
e35af832
KS		 981/*
982 * Expect ALIAS.
983 */
984
5a00d8fe
KS		 985static int
986yaml_emitter_emit_alias(yaml_emitter_t *emitter, yaml_event_t *event)
987{
e35af832 988 if (!yaml_emitter_process_anchor(emitter))
5a00d8fe
KS		 989 return 0;
990 emitter->state = POP(emitter, emitter->states);
991
992 return 1;
993}
994
e35af832
KS		 995/*
996 * Expect SCALAR.
997 */
998
5a00d8fe
KS		 999static int
1000yaml_emitter_emit_scalar(yaml_emitter_t *emitter, yaml_event_t *event)
1001{
e35af832 1002 if (!yaml_emitter_select_scalar_style(emitter, event))
5a00d8fe 1003 return 0;
e35af832
KS		 1004 if (!yaml_emitter_process_anchor(emitter))
1005 return 0;
1006 if (!yaml_emitter_process_tag(emitter))
5a00d8fe
KS		 1007 return 0;
1008 if (!yaml_emitter_increase_indent(emitter, 1, 0))
1009 return 0;
e35af832 1010 if (!yaml_emitter_process_scalar(emitter))
5a00d8fe
KS		 1011 return 0;
1012 emitter->indent = POP(emitter, emitter->indents);
1013 emitter->state = POP(emitter, emitter->states);
1014
1015 return 1;
1016}
1017
e35af832
KS		 1018/*
1019 * Expect SEQUENCE-START.
1020 */
1021
5a00d8fe
KS		 1022static int
1023yaml_emitter_emit_sequence_start(yaml_emitter_t *emitter, yaml_event_t *event)
1024{
e35af832 1025 if (!yaml_emitter_process_anchor(emitter))
5a00d8fe 1026 return 0;
e35af832 1027 if (!yaml_emitter_process_tag(emitter))
5a00d8fe
KS		 1028 return 0;
1029
1030 if (emitter->flow_level || emitter->canonical
1031 || event->data.sequence_start.style == YAML_FLOW_SEQUENCE_STYLE
1032 || yaml_emitter_check_empty_sequence(emitter)) {
1033 emitter->state = YAML_EMIT_FLOW_SEQUENCE_FIRST_ITEM_STATE;
1034 }
1035 else {
1036 emitter->state = YAML_EMIT_BLOCK_SEQUENCE_FIRST_ITEM_STATE;
1037 }
1038
1039 return 1;
1040}
1041
e35af832
KS		 1042/*
1043 * Expect MAPPING-START.
1044 */
1045
5a00d8fe
KS		 1046static int
1047yaml_emitter_emit_mapping_start(yaml_emitter_t *emitter, yaml_event_t *event)
1048{
e35af832 1049 if (!yaml_emitter_process_anchor(emitter))
5a00d8fe 1050 return 0;
e35af832 1051 if (!yaml_emitter_process_tag(emitter))
5a00d8fe
KS		 1052 return 0;
1053
1054 if (emitter->flow_level || emitter->canonical
1055 || event->data.mapping_start.style == YAML_FLOW_MAPPING_STYLE
1056 || yaml_emitter_check_empty_mapping(emitter)) {
1057 emitter->state = YAML_EMIT_FLOW_MAPPING_FIRST_KEY_STATE;
1058 }
1059 else {
1060 emitter->state = YAML_EMIT_BLOCK_MAPPING_FIRST_KEY_STATE;
1061 }
1062
1063 return 1;
1064}
1065
e35af832
KS		 1066/*
1067 * Check if the document content is an empty scalar.
1068 */
1069
1070static int
1071yaml_emitter_check_empty_document(yaml_emitter_t *emitter)
1072{
1073 return 0;
1074}
1075
1076/*
1077 * Check if the next events represent an empty sequence.
1078 */
1079
1080static int
1081yaml_emitter_check_empty_sequence(yaml_emitter_t *emitter)
1082{
1083 if (emitter->events.tail - emitter->events.head < 2)
1084 return 0;
1085
1086 return (emitter->events.head[0].type == YAML_SEQUENCE_START_EVENT
1087 && emitter->events.head[1].type == YAML_SEQUENCE_END_EVENT);
1088}
1089
1090/*
1091 * Check if the next events represent an empty mapping.
1092 */
1093
1094static int
1095yaml_emitter_check_empty_mapping(yaml_emitter_t *emitter)
1096{
1097 if (emitter->events.tail - emitter->events.head < 2)
1098 return 0;
1099
1100 return (emitter->events.head[0].type == YAML_MAPPING_START_EVENT
1101 && emitter->events.head[1].type == YAML_MAPPING_END_EVENT);
1102}
1103
1104/*
1105 * Check if the next node can be expressed as a simple key.
1106 */
1107
1108static int
1109yaml_emitter_check_simple_key(yaml_emitter_t *emitter)
1110{
1111 yaml_event_t *event = emitter->events.head;
1112 size_t length = 0;
1113
1114 switch (event->type)
1115 {
1116 case YAML_ALIAS_EVENT:
1117 length += emitter->anchor_data.anchor_length;
1118 break;
1119
1120 case YAML_SCALAR_EVENT:
1121 if (emitter->scalar_data.multiline)
1122 return 0;
1123 length += emitter->anchor_data.anchor_length
1124 + emitter->tag_data.handle_length
1125 + emitter->tag_data.suffix_length
1126 + emitter->scalar_data.length;
1127 break;
1128
1129 case YAML_SEQUENCE_START_EVENT:
1130 if (!yaml_emitter_check_empty_sequence(emitter))
1131 return 0;
1132 length += emitter->anchor_data.anchor_length
1133 + emitter->tag_data.handle_length
1134 + emitter->tag_data.suffix_length;
1135 break;
1136
1137 case YAML_MAPPING_START_EVENT:
1138 if (!yaml_emitter_check_empty_sequence(emitter))
1139 return 0;
1140 length += emitter->anchor_data.anchor_length
1141 + emitter->tag_data.handle_length
1142 + emitter->tag_data.suffix_length;
1143 break;
1144
1145 default:
1146 return 0;
1147 }
1148
1149 if (length > 128)
1150 return 0;
1151
1152 return 1;
1153}
1154
1155/*
1156 * Determine an acceptable scalar style.
1157 */
1158
1159static int
1160yaml_emitter_select_scalar_style(yaml_emitter_t *emitter, yaml_event_t *event)
1161{
1162 yaml_scalar_style_t style = event->data.scalar.style;
e27a3c88
KS		 1163 int no_tag = (!emitter->tag_data.handle && !emitter->tag_data.suffix);
1164
1165 if (no_tag && !event->data.scalar.plain_implicit
1166 && !event->data.scalar.quoted_implicit) {
1167 return yaml_emitter_set_emitter_error(emitter,
1168 "neither tag nor implicit flags are specified");
1169 }
e35af832
KS		 1170
1171 if (style == YAML_ANY_SCALAR_STYLE)
1172 style = YAML_PLAIN_SCALAR_STYLE;
1173
1174 if (emitter->canonical)
1175 style = YAML_DOUBLE_QUOTED_SCALAR_STYLE;
1176
1177 if (emitter->simple_key_context && emitter->scalar_data.multiline)
1178 style = YAML_DOUBLE_QUOTED_SCALAR_STYLE;
1179
1180 if (style == YAML_PLAIN_SCALAR_STYLE)
1181 {
1182 if ((emitter->flow_level && !emitter->scalar_data.flow_plain_allowed)
1183 || (!emitter->flow_level && !emitter->scalar_data.block_plain_allowed))
1184 style = YAML_SINGLE_QUOTED_SCALAR_STYLE;
1185 if (!emitter->scalar_data.length
1186 && (emitter->flow_level || emitter->simple_key_context))
1187 style = YAML_SINGLE_QUOTED_SCALAR_STYLE;
e27a3c88 1188 if (no_tag && !event->data.scalar.plain_implicit)
e35af832
KS		 1189 style = YAML_SINGLE_QUOTED_SCALAR_STYLE;
1190 }
1191
1192 if (style == YAML_SINGLE_QUOTED_SCALAR_STYLE)
1193 {
1194 if (!emitter->scalar_data.single_quoted_allowed)
1195 style = YAML_DOUBLE_QUOTED_SCALAR_STYLE;
1196 }
1197
1198 if (style == YAML_LITERAL_SCALAR_STYLE || style == YAML_FOLDED_SCALAR_STYLE)
1199 {
6d167281
KS		 1200 if (!emitter->scalar_data.block_allowed
1201 || emitter->flow_level || emitter->simple_key_context)
e35af832
KS		 1202 style = YAML_DOUBLE_QUOTED_SCALAR_STYLE;
1203 }
1204
e27a3c88
KS		 1205 if (no_tag && !event->data.scalar.quoted_implicit
1206 && style != YAML_PLAIN_SCALAR_STYLE)
e35af832 1207 {
e27a3c88
KS		 1208 emitter->tag_data.handle = (yaml_char_t *)"!";
1209 emitter->tag_data.handle_length = 1;
e35af832
KS		 1210 }
1211
1212 emitter->scalar_data.style = style;
1213
1214 return 1;
1215}
1216
1217/*
1218 * Write an achor.
1219 */
1220
1221static int
1222yaml_emitter_process_anchor(yaml_emitter_t *emitter)
1223{
1224 if (!emitter->anchor_data.anchor)
1225 return 1;
1226
1227 if (!yaml_emitter_write_indicator(emitter,
1228 (emitter->anchor_data.alias ? "*" : "&"), 1, 0, 0))
1229 return 0;
1230
1231 return yaml_emitter_write_anchor(emitter,
1232 emitter->anchor_data.anchor, emitter->anchor_data.anchor_length);
1233}
1234
1235/*
1236 * Write a tag.
1237 */
1238
1239static int
1240yaml_emitter_process_tag(yaml_emitter_t *emitter)
1241{
1242 if (!emitter->tag_data.handle && !emitter->tag_data.suffix)
1243 return 1;
1244
1245 if (emitter->tag_data.handle)
1246 {
1247 if (!yaml_emitter_write_tag_handle(emitter, emitter->tag_data.handle,
1248 emitter->tag_data.handle_length))
1249 return 0;
1250 if (emitter->tag_data.suffix) {
1251 if (!yaml_emitter_write_tag_content(emitter, emitter->tag_data.suffix,
784340c2 1252 emitter->tag_data.suffix_length, 0))
e35af832
KS		 1253 return 0;
1254 }
1255 }
1256 else
1257 {
1258 if (!yaml_emitter_write_indicator(emitter, "!<", 1, 0, 0))
1259 return 0;
1260 if (!yaml_emitter_write_tag_content(emitter, emitter->tag_data.suffix,
784340c2 1261 emitter->tag_data.suffix_length, 0))
e35af832
KS		 1262 return 0;
1263 if (!yaml_emitter_write_indicator(emitter, ">", 0, 0, 0))
1264 return 0;
1265 }
1266
1267 return 1;
1268}
1269
1270/*
1271 * Write a scalar.
1272 */
1273
1274static int
1275yaml_emitter_process_scalar(yaml_emitter_t *emitter)
1276{
1277 switch (emitter->scalar_data.style)
1278 {
1279 case YAML_PLAIN_SCALAR_STYLE:
1280 return yaml_emitter_write_plain_scalar(emitter,
1281 emitter->scalar_data.value, emitter->scalar_data.length,
1282 !emitter->simple_key_context);
1283
1284 case YAML_SINGLE_QUOTED_SCALAR_STYLE:
1285 return yaml_emitter_write_single_quoted_scalar(emitter,
1286 emitter->scalar_data.value, emitter->scalar_data.length,
1287 !emitter->simple_key_context);
1288
1289 case YAML_DOUBLE_QUOTED_SCALAR_STYLE:
1290 return yaml_emitter_write_double_quoted_scalar(emitter,
1291 emitter->scalar_data.value, emitter->scalar_data.length,
1292 !emitter->simple_key_context);
1293
1294 case YAML_LITERAL_SCALAR_STYLE:
1295 return yaml_emitter_write_literal_scalar(emitter,
1296 emitter->scalar_data.value, emitter->scalar_data.length);
1297
1298 case YAML_FOLDED_SCALAR_STYLE:
1299 return yaml_emitter_write_folded_scalar(emitter,
1300 emitter->scalar_data.value, emitter->scalar_data.length);
1301
1302 default:
1303 assert(1); /* Impossible. */
1304 }
1305
1306 return 0;
1307}
1308
1309/*
1310 * Check if a %YAML directive is valid.
1311 */
1312
1313static int
1314yaml_emitter_analyze_version_directive(yaml_emitter_t *emitter,
1315 yaml_version_directive_t version_directive)
1316{
1317 if (version_directive.major != 1 || version_directive.minor != 1) {
1318 return yaml_emitter_set_emitter_error(emitter,
1319 "incompatible %YAML directive");
1320 }
1321
1322 return 1;
1323}
1324
1325/*
1326 * Check if a %TAG directive is valid.
1327 */
1328
1329static int
1330yaml_emitter_analyze_tag_directive(yaml_emitter_t *emitter,
1331 yaml_tag_directive_t tag_directive)
1332{
1333 yaml_string_t handle = STRING(tag_directive.handle,
1334 strlen((char *)tag_directive.handle));
1335 yaml_string_t prefix = STRING(tag_directive.prefix,
1336 strlen((char *)tag_directive.prefix));
1337
1338 if (handle.start == handle.end) {
1339 return yaml_emitter_set_emitter_error(emitter,
1340 "tag handle must not be empty");
1341 }
1342
1343 if (handle.start[0] != '!') {
1344 return yaml_emitter_set_emitter_error(emitter,
1345 "tag handle must start with '!'");
1346 }
1347
1348 if (handle.end[-1] != '!') {
1349 return yaml_emitter_set_emitter_error(emitter,
1350 "tag handle must end with '!'");
1351 }
1352
1353 handle.pointer ++;
1354
6d167281 1355 while (handle.pointer < handle.end-1) {
e35af832
KS		 1356 if (!IS_ALPHA(handle)) {
1357 return yaml_emitter_set_emitter_error(emitter,
1358 "tag handle must contain alphanumerical characters only");
1359 }
1360 MOVE(handle);
1361 }
1362
1363 if (prefix.start == prefix.end) {
1364 return yaml_emitter_set_emitter_error(emitter,
1365 "tag prefix must not be empty");
1366 }
1367
1368 return 1;
1369}
1370
1371/*
1372 * Check if an anchor is valid.
1373 */
1374
1375static int
1376yaml_emitter_analyze_anchor(yaml_emitter_t *emitter,
1377 yaml_char_t *anchor, int alias)
1378{
1379 yaml_string_t string = STRING(anchor, strlen((char *)anchor));
1380
1381 if (string.start == string.end) {
1382 return yaml_emitter_set_emitter_error(emitter, alias ?
1383 "alias value must not be empty" :
1384 "anchor value must not be empty");
1385 }
1386
1387 while (string.pointer != string.end) {
1388 if (!IS_ALPHA(string)) {
1389 return yaml_emitter_set_emitter_error(emitter, alias ?
1390 "alias value must contain alphanumerical characters only" :
1391 "anchor value must contain alphanumerical characters only");
1392 }
1393 MOVE(string);
1394 }
6d167281
KS		 1395
1396 emitter->anchor_data.anchor = string.start;
1397 emitter->anchor_data.anchor_length = string.end - string.start;
1398 emitter->anchor_data.alias = alias;
1399
1400 return 1;
e35af832
KS		 1401}
1402
1403/*
1404 * Check if a tag is valid.
1405 */
1406
1407static int
1408yaml_emitter_analyze_tag(yaml_emitter_t *emitter,
1409 yaml_char_t *tag)
1410{
1411 yaml_string_t string = STRING(tag, strlen((char *)tag));
1412 yaml_tag_directive_t *tag_directive;
1413
1414 if (string.start == string.end) {
1415 return yaml_emitter_set_emitter_error(emitter,
1416 "tag value must not be empty");
1417 }
1418
1419 for (tag_directive = emitter->tag_directives.start;
6d167281 1420 tag_directive != emitter->tag_directives.top; tag_directive ++) {
e35af832 1421 size_t prefix_length = strlen((char *)tag_directive->prefix);
0174ed6e 1422 if (prefix_length < (size_t)(string.end - string.start)
e35af832
KS		 1423 && strncmp((char *)tag_directive->prefix, (char *)string.start,
1424 prefix_length) == 0)
1425 {
1426 emitter->tag_data.handle = tag_directive->handle;
1427 emitter->tag_data.handle_length =
1428 strlen((char *)tag_directive->handle);
1429 emitter->tag_data.suffix = string.start + prefix_length;
1430 emitter->tag_data.suffix_length =
1431 (string.end - string.start) - prefix_length;
1432 return 1;
1433 }
1434 }
1435
1436 emitter->tag_data.suffix = string.start;
1437 emitter->tag_data.suffix_length = string.end - string.start;
1438
1439 return 1;
1440}
1441
1442/*
1443 * Check if a scalar is valid.
1444 */
1445
1446static int
1447yaml_emitter_analyze_scalar(yaml_emitter_t *emitter,
1448 yaml_char_t *value, size_t length)
1449{
1450 yaml_string_t string = STRING(value, length);
1451
1452 int block_indicators = 0;
1453 int flow_indicators = 0;
1454 int line_breaks = 0;
1455 int special_characters = 0;
1456
1457 int inline_spaces = 0;
1458 int inline_breaks = 0;
1459 int leading_spaces = 0;
1460 int leading_breaks = 0;
1461 int trailing_spaces = 0;
1462 int trailing_breaks = 0;
1463 int inline_breaks_spaces = 0;
1464 int mixed_breaks_spaces = 0;
1465
1466 int preceeded_by_space = 0;
1467 int followed_by_space = 0;
1468 int spaces = 0;
1469 int breaks = 0;
1470 int mixed = 0;
1471 int leading = 0;
1472
1473 emitter->scalar_data.value = value;
1474 emitter->scalar_data.length = length;
1475
1476 if (string.start == string.end)
1477 {
1478 emitter->scalar_data.multiline = 0;
1479 emitter->scalar_data.flow_plain_allowed = 0;
1480 emitter->scalar_data.block_plain_allowed = 1;
1481 emitter->scalar_data.single_quoted_allowed = 1;
1482 emitter->scalar_data.block_allowed = 0;
1483
1484 return 1;
1485 }
1486
1487 if ((CHECK_AT(string, '-', 0)
1488 && CHECK_AT(string, '-', 1)
1489 && CHECK_AT(string, '-', 2))
1490 || (CHECK_AT(string, '.', 0)
1491 && CHECK_AT(string, '.', 1)
1492 && CHECK_AT(string, '.', 2))) {
1493 block_indicators = 1;
1494 flow_indicators = 1;
1495 }
1496
1497 preceeded_by_space = 1;
1498 followed_by_space = IS_BLANKZ_AT(string, WIDTH(string));
1499
1500 while (string.pointer != string.end)
1501 {
1502 if (string.start == string.pointer)
1503 {
1504 if (CHECK(string, '#') || CHECK(string, ',')
1505 || CHECK(string, '[') || CHECK(string, ']')
1506 || CHECK(string, '{') || CHECK(string, '}')
1507 || CHECK(string, '&') || CHECK(string, '*')
1508 || CHECK(string, '!') || CHECK(string, '|')
1509 || CHECK(string, '>') || CHECK(string, '\'')
1510 || CHECK(string, '"') || CHECK(string, '%')
1511 || CHECK(string, '@') || CHECK(string, '`')) {
1512 flow_indicators = 1;
1513 block_indicators = 1;
1514 }
1515
1516 if (CHECK(string, '?') || CHECK(string, ':')) {
1517 flow_indicators = 1;
1518 if (followed_by_space) {
1519 block_indicators = 1;
1520 }
1521 }
1522
1523 if (CHECK(string, '-') && followed_by_space) {
1524 flow_indicators = 1;
1525 block_indicators = 1;
1526 }
1527 }
1528 else
1529 {
1530 if (CHECK(string, ',') || CHECK(string, '?')
1531 || CHECK(string, '[') || CHECK(string, ']')
1532 || CHECK(string, '{') || CHECK(string, '}')) {
1533 flow_indicators = 1;
1534 }
1535
1536 if (CHECK(string, ':')) {
1537 flow_indicators = 1;
1538 if (followed_by_space) {
1539 block_indicators = 1;
1540 }
1541 }
1542
1543 if (CHECK(string, '#') && preceeded_by_space) {
1544 flow_indicators = 1;
1545 block_indicators = 1;
1546 }
1547 }
1548
1549 if (!IS_PRINTABLE(string)
1550 || (!IS_ASCII(string) && !emitter->unicode)) {
1551 special_characters = 1;
1552 }
1553
1554 if (IS_BREAK(string)) {
1555 line_breaks = 1;
1556 }
1557
1558 if (IS_SPACE(string))
1559 {
1560 spaces = 1;
1561 if (string.start == string.pointer) {
1562 leading = 1;
1563 }
1564 }
1565
1566 else if (IS_BREAK(string))
1567 {
1568 if (spaces) {
1569 mixed = 1;
1570 }
1571 breaks = 1;
1572 if (string.start == string.pointer) {
1573 leading = 1;
1574 }
1575 }
1576
1577 else if (spaces || breaks)
1578 {
1579 if (leading) {
1580 if (spaces && breaks) {
1581 mixed_breaks_spaces = 1;
1582 }
1583 else if (spaces) {
1584 leading_spaces = 1;
1585 }
1586 else if (breaks) {
1587 leading_breaks = 1;
1588 }
1589 }
1590 else {
1591 if (mixed) {
1592 mixed_breaks_spaces = 1;
1593 }
1594 else if (spaces && breaks) {
1595 inline_breaks_spaces = 1;
1596 }
1597 else if (spaces) {
1598 inline_spaces = 1;
1599 }
1600 else if (breaks) {
1601 inline_breaks = 1;
1602 }
1603 }
1604 spaces = breaks = mixed = leading = 0;
1605 }
1606
6d167281
KS		 1607 if ((spaces || breaks) && string.pointer == string.end-1)
1608 {
1609 if (spaces && breaks) {
1610 mixed_breaks_spaces = 1;
1611 }
1612 else if (spaces) {
1613 if (leading) {
1614 leading_spaces = 1;
1615 }
1616 trailing_spaces = 1;
1617 }
1618 else if (breaks) {
1619 if (leading) {
1620 leading_breaks = 1;
1621 }
1622 trailing_breaks = 1;
1623 }
1624 }
1625
e35af832
KS		 1626 preceeded_by_space = IS_BLANKZ(string);
1627 MOVE(string);
1628 if (string.pointer != string.end) {
1629 followed_by_space = IS_BLANKZ_AT(string, WIDTH(string));
1630 }
1631 }
1632
1633 emitter->scalar_data.multiline = line_breaks;
1634
1635 emitter->scalar_data.flow_plain_allowed = 1;
1636 emitter->scalar_data.block_plain_allowed = 1;
1637 emitter->scalar_data.single_quoted_allowed = 1;
1638 emitter->scalar_data.block_allowed = 1;
1639
1640 if (leading_spaces || leading_breaks || trailing_spaces) {
1641 emitter->scalar_data.flow_plain_allowed = 0;
1642 emitter->scalar_data.block_plain_allowed = 0;
1643 emitter->scalar_data.block_allowed = 0;
1644 }
1645
1646 if (trailing_breaks) {
1647 emitter->scalar_data.flow_plain_allowed = 0;
1648 emitter->scalar_data.block_plain_allowed = 0;
1649 }
1650
1651 if (inline_breaks_spaces) {
1652 emitter->scalar_data.flow_plain_allowed = 0;
1653 emitter->scalar_data.block_plain_allowed = 0;
1654 emitter->scalar_data.single_quoted_allowed = 0;
1655 }
1656
1657 if (mixed_breaks_spaces || special_characters) {
1658 emitter->scalar_data.flow_plain_allowed = 0;
1659 emitter->scalar_data.block_plain_allowed = 0;
1660 emitter->scalar_data.single_quoted_allowed = 0;
1661 emitter->scalar_data.block_allowed = 0;
1662 }
1663
1664 if (line_breaks) {
1665 emitter->scalar_data.flow_plain_allowed = 0;
1666 emitter->scalar_data.block_plain_allowed = 0;
1667 }
1668
1669 if (flow_indicators) {
1670 emitter->scalar_data.flow_plain_allowed = 0;
1671 }
1672
1673 if (block_indicators) {
1674 emitter->scalar_data.block_plain_allowed = 0;
1675 }
1676
1677 return 1;
1678}
1679
1680/*
1681 * Check if the event data is valid.
1682 */
1683
1684static int
1685yaml_emitter_analyze_event(yaml_emitter_t *emitter,
1686 yaml_event_t *event)
1687{
1688 emitter->anchor_data.anchor = NULL;
1689 emitter->anchor_data.anchor_length = 0;
1690 emitter->tag_data.handle = NULL;
1691 emitter->tag_data.handle_length = 0;
1692 emitter->tag_data.suffix = NULL;
1693 emitter->tag_data.suffix_length = 0;
1694 emitter->scalar_data.value = NULL;
1695 emitter->scalar_data.length = 0;
1696
1697 switch (event->type)
1698 {
1699 case YAML_ALIAS_EVENT:
1700 if (!yaml_emitter_analyze_anchor(emitter,
1701 event->data.alias.anchor, 1))
1702 return 0;
1703 return 1;
1704
1705 case YAML_SCALAR_EVENT:
1706 if (event->data.scalar.anchor) {
1707 if (!yaml_emitter_analyze_anchor(emitter,
1708 event->data.scalar.anchor, 0))
1709 return 0;
1710 }
1711 if (event->data.scalar.tag && (emitter->canonical ||
1712 (!event->data.scalar.plain_implicit
1713 && !event->data.scalar.quoted_implicit))) {
1714 if (!yaml_emitter_analyze_tag(emitter, event->data.scalar.tag))
1715 return 0;
1716 }
1717 if (!yaml_emitter_analyze_scalar(emitter,
1718 event->data.scalar.value, event->data.scalar.length))
1719 return 0;
1720 return 1;
1721
1722 case YAML_SEQUENCE_START_EVENT:
1723 if (event->data.sequence_start.anchor) {
1724 if (!yaml_emitter_analyze_anchor(emitter,
1725 event->data.sequence_start.anchor, 0))
1726 return 0;
1727 }
1728 if (event->data.sequence_start.tag && (emitter->canonical ||
1729 !event->data.sequence_start.implicit)) {
1730 if (!yaml_emitter_analyze_tag(emitter,
1731 event->data.sequence_start.tag))
1732 return 0;
1733 }
1734 return 1;
1735
1736 case YAML_MAPPING_START_EVENT:
1737 if (event->data.mapping_start.anchor) {
1738 if (!yaml_emitter_analyze_anchor(emitter,
1739 event->data.mapping_start.anchor, 0))
1740 return 0;
1741 }
1742 if (event->data.mapping_start.tag && (emitter->canonical ||
1743 !event->data.mapping_start.implicit)) {
1744 if (!yaml_emitter_analyze_tag(emitter,
1745 event->data.mapping_start.tag))
1746 return 0;
1747 }
1748 return 1;
1749
1750 default:
1751 return 1;
1752 }
1753}
1754
1755/*
1756 * Write the BOM character.
1757 */
1758
1759static int
1760yaml_emitter_write_bom(yaml_emitter_t *emitter)
1761{
1762 if (!FLUSH(emitter)) return 0;
1763
1764 *(emitter->buffer.pointer++) = (yaml_char_t) '\xEF';
1765 *(emitter->buffer.pointer++) = (yaml_char_t) '\xBB';
1766 *(emitter->buffer.pointer++) = (yaml_char_t) '\xBF';
1767
1768 return 1;
1769}
1770
1771static int
1772yaml_emitter_write_indent(yaml_emitter_t *emitter)
1773{
1774 int indent = (emitter->indent >= 0) ? emitter->indent : 0;
1775
1776 if (!emitter->indention || emitter->column > indent
1777 || (emitter->column == indent && !emitter->whitespace)) {
1778 if (!PUT_BREAK(emitter)) return 0;
1779 }
1780
1781 while (emitter->column < indent) {
1782 if (!PUT(emitter, ' ')) return 0;
1783 }
1784
1785 emitter->whitespace = 1;
1786 emitter->indention = 1;
1787
1788 return 1;
1789}
1790
1791static int
1792yaml_emitter_write_indicator(yaml_emitter_t *emitter,
1793 char *indicator, int need_whitespace,
1794 int is_whitespace, int is_indention)
1795{
1796 yaml_string_t string = STRING((yaml_char_t *)indicator, strlen(indicator));
1797
1798 if (need_whitespace && !emitter->whitespace) {
1799 if (!PUT(emitter, ' ')) return 0;
1800 }
1801
1802 while (string.pointer != string.end) {
1803 if (!WRITE(emitter, string)) return 0;
1804 }
1805
1806 emitter->whitespace = is_whitespace;
1807 emitter->indention = (emitter->indention && is_indention);
1808
1809 return 1;
1810}
1811
1812static int
1813yaml_emitter_write_anchor(yaml_emitter_t *emitter,
1814 yaml_char_t *value, size_t length)
1815{
1816 yaml_string_t string = STRING(value, length);
1817
1818 while (string.pointer != string.end) {
1819 if (!WRITE(emitter, string)) return 0;
1820 }
1821
1822 emitter->whitespace = 0;
1823 emitter->indention = 0;
1824
1825 return 1;
1826}
1827
1828static int
1829yaml_emitter_write_tag_handle(yaml_emitter_t *emitter,
1830 yaml_char_t *value, size_t length)
1831{
1832 yaml_string_t string = STRING(value, length);
1833
784340c2
KS		 1834 if (!emitter->whitespace) {
1835 if (!PUT(emitter, ' ')) return 0;
1836 }
1837
e35af832
KS		 1838 while (string.pointer != string.end) {
1839 if (!WRITE(emitter, string)) return 0;
1840 }
1841
1842 emitter->whitespace = 0;
1843 emitter->indention = 0;
1844
1845 return 1;
1846}
1847
1848static int
1849yaml_emitter_write_tag_content(yaml_emitter_t *emitter,
784340c2
KS		 1850 yaml_char_t *value, size_t length,
1851 int need_whitespace)
e35af832 1852{
784340c2
KS		 1853 yaml_string_t string = STRING(value, length);
1854
1855 if (need_whitespace && !emitter->whitespace) {
1856 if (!PUT(emitter, ' ')) return 0;
1857 }
1858
1859 while (string.pointer != string.end) {
1860 if (IS_ALPHA(string)
1861 || CHECK(string, ';') || CHECK(string, '/')
1862 || CHECK(string, '?') || CHECK(string, ':')
1863 || CHECK(string, '@') || CHECK(string, '&')
1864 || CHECK(string, '=') || CHECK(string, '+')
1865 || CHECK(string, '$') || CHECK(string, ',')
1866 || CHECK(string, '_') || CHECK(string, '.')
1867 || CHECK(string, '~') || CHECK(string, '*')
1868 || CHECK(string, '\'') || CHECK(string, '(')
1869 || CHECK(string, ')') || CHECK(string, '[')
1870 || CHECK(string, ']')) {
1871 if (!WRITE(emitter, string)) return 0;
1872 }
1873 else {
1874 int width = WIDTH(string);
1875 unsigned int value;
1876 while (width --) {
1877 value = *(string.pointer++);
1878 if (!PUT(emitter, '%')) return 0;
6d167281
KS		 1879 if (!PUT(emitter, (value >> 4)
1880 + ((value >> 4) < 10 ? '0' : 'A' - 10)))
784340c2
KS		 1881 return 0;
1882 if (!PUT(emitter, (value & 0x0F)
1883 + ((value & 0x0F) < 10 ? '0' : 'A' - 10)))
1884 return 0;
1885 }
1886 }
1887 }
1888
1889 emitter->whitespace = 0;
1890 emitter->indention = 0;
1891
1892 return 1;
e35af832
KS		 1893}
1894
1895static int
1896yaml_emitter_write_plain_scalar(yaml_emitter_t *emitter,
1897 yaml_char_t *value, size_t length, int allow_breaks)
1898{
784340c2
KS		 1899 yaml_string_t string = STRING(value, length);
1900 int spaces = 0;
1901 int breaks = 0;
1902
1903 if (!emitter->whitespace) {
1904 if (!PUT(emitter, ' ')) return 0;
1905 }
1906
1907 while (string.pointer != string.end)
1908 {
1909 if (IS_SPACE(string))
1910 {
1911 if (allow_breaks && !spaces
1912 && emitter->column > emitter->best_width
1913 && !IS_SPACE_AT(string, 1)) {
1914 if (!yaml_emitter_write_indent(emitter)) return 0;
1915 MOVE(string);
1916 }
1917 else {
1918 if (!WRITE(emitter, string)) return 0;
1919 }
1920 spaces = 1;
1921 }
1922 else if (IS_BREAK(string))
1923 {
1924 if (!breaks && CHECK(string, '\n')) {
1925 if (!PUT_BREAK(emitter)) return 0;
1926 }
1927 if (!WRITE_BREAK(emitter, string)) return 0;
1928 emitter->indention = 1;
1929 breaks = 1;
1930 }
1931 else
1932 {
1933 if (breaks) {
1934 if (!yaml_emitter_write_indent(emitter)) return 0;
1935 }
1936 if (!WRITE(emitter, string)) return 0;
1937 emitter->indention = 0;
1938 spaces = 0;
1939 breaks = 0;
1940 }
1941 }
1942
1943 emitter->whitespace = 0;
1944 emitter->indention = 0;
1945
1946 return 1;
e35af832
KS		 1947}
1948
1949static int
1950yaml_emitter_write_single_quoted_scalar(yaml_emitter_t *emitter,
1951 yaml_char_t *value, size_t length, int allow_breaks)
1952{
784340c2
KS		 1953 yaml_string_t string = STRING(value, length);
1954 int spaces = 0;
1955 int breaks = 0;
1956
1957 if (!yaml_emitter_write_indicator(emitter, "'", 1, 0, 0))
1958 return 0;
1959
1960 while (string.pointer != string.end)
1961 {
1962 if (IS_SPACE(string))
1963 {
1964 if (allow_breaks && !spaces
1965 && emitter->column > emitter->best_width
1966 && string.pointer != string.start
1967 && string.pointer != string.end - 1
1968 && !IS_SPACE_AT(string, 1)) {
1969 if (!yaml_emitter_write_indent(emitter)) return 0;
1970 MOVE(string);
1971 }
1972 else {
1973 if (!WRITE(emitter, string)) return 0;
1974 }
1975 spaces = 1;
1976 }
1977 else if (IS_BREAK(string))
1978 {
1979 if (!breaks && CHECK(string, '\n')) {
1980 if (!PUT_BREAK(emitter)) return 0;
1981 }
1982 if (!WRITE_BREAK(emitter, string)) return 0;
1983 emitter->indention = 1;
1984 breaks = 1;
1985 }
1986 else
1987 {
1988 if (breaks) {
1989 if (!yaml_emitter_write_indent(emitter)) return 0;
1990 }
1991 if (CHECK(string, '\'')) {
1992 if (!PUT(emitter, '\'')) return 0;
1993 }
1994 if (!WRITE(emitter, string)) return 0;
1995 emitter->indention = 0;
1996 spaces = 0;
1997 breaks = 0;
1998 }
1999 }
2000
2001 if (!yaml_emitter_write_indicator(emitter, "'", 0, 0, 0))
2002 return 0;
2003
2004 emitter->whitespace = 0;
2005 emitter->indention = 0;
2006
2007 return 1;
e35af832
KS		 2008}
2009
2010static int
2011yaml_emitter_write_double_quoted_scalar(yaml_emitter_t *emitter,
2012 yaml_char_t *value, size_t length, int allow_breaks)
2013{
784340c2
KS		 2014 yaml_string_t string = STRING(value, length);
2015 int spaces = 0;
2016
2017 if (!yaml_emitter_write_indicator(emitter, "\"", 1, 0, 0))
2018 return 0;
2019
2020 while (string.pointer != string.end)
2021 {
2022 if (!IS_PRINTABLE(string) || (!emitter->unicode && !IS_ASCII(string))
2023 || IS_BOM(string) || IS_BREAK(string)
2024 || CHECK(string, '"') || CHECK(string, '\\'))
2025 {
2026 unsigned char octet;
2027 unsigned int width;
2028 unsigned int value;
0174ed6e 2029 size_t k;
784340c2
KS		 2030
2031 octet = string.pointer[0];
2032 width = (octet & 0x80) == 0x00 ? 1 :
2033 (octet & 0xE0) == 0xC0 ? 2 :
2034 (octet & 0xF0) == 0xE0 ? 3 :
2035 (octet & 0xF8) == 0xF0 ? 4 : 0;
2036 value = (octet & 0x80) == 0x00 ? octet & 0x7F :
2037 (octet & 0xE0) == 0xC0 ? octet & 0x1F :
2038 (octet & 0xF0) == 0xE0 ? octet & 0x0F :
2039 (octet & 0xF8) == 0xF0 ? octet & 0x07 : 0;
2040 for (k = 1; k < width; k ++) {
2041 octet = string.pointer[k];
2042 value = (value << 6) + (octet & 0x3F);
2043 }
2044 string.pointer += width;
2045
2046 if (!PUT(emitter, '\\')) return 0;
2047
2048 switch (value)
2049 {
2050 case 0x00:
2051 if (!PUT(emitter, '0')) return 0;
2052 break;
2053
2054 case 0x07:
2055 if (!PUT(emitter, 'a')) return 0;
2056 break;
2057
2058 case 0x08:
2059 if (!PUT(emitter, 'b')) return 0;
2060 break;
2061
2062 case 0x09:
2063 if (!PUT(emitter, 't')) return 0;
2064 break;
2065
2066 case 0x0A:
2067 if (!PUT(emitter, 'n')) return 0;
2068 break;
2069
2070 case 0x0B:
2071 if (!PUT(emitter, 'v')) return 0;
2072 break;
2073
2074 case 0x0C:
2075 if (!PUT(emitter, 'f')) return 0;
2076 break;
2077
2078 case 0x0D:
2079 if (!PUT(emitter, 'r')) return 0;
2080 break;
2081
2082 case 0x1B:
2083 if (!PUT(emitter, 'e')) return 0;
2084 break;
2085
2086 case 0x22:
2087 if (!PUT(emitter, '\"')) return 0;
2088 break;
2089
2090 case 0x5C:
2091 if (!PUT(emitter, '\\')) return 0;
2092 break;
2093
2094 case 0x85:
2095 if (!PUT(emitter, 'N')) return 0;
2096 break;
2097
2098 case 0xA0:
2099 if (!PUT(emitter, '_')) return 0;
2100 break;
2101
2102 case 0x2028:
2103 if (!PUT(emitter, 'L')) return 0;
2104 break;
2105
2106 case 0x2029:
2107 if (!PUT(emitter, 'P')) return 0;
2108 break;
2109
2110 default:
2111 if (value <= 0xFF) {
2112 if (!PUT(emitter, 'x')) return 0;
2113 width = 2;
2114 }
2115 else if (value <= 0xFFFF) {
2116 if (!PUT(emitter, 'u')) return 0;
2117 width = 4;
2118 }
2119 else {
2120 if (!PUT(emitter, 'U')) return 0;
2121 width = 8;
2122 }
6d167281
KS		 2123 for (k = (width-1)*4; k >= 0; k -= 4) {
2124 int digit = (value >> k) & 0x0F;
2125 if (!PUT(emitter, digit + (digit < 10 ? '0' : 'A'-10)))
2126 return 0;
784340c2
KS		 2127 }
2128 }
2129 spaces = 0;
2130 }
2131 else if (IS_SPACE(string))
2132 {
2133 if (allow_breaks && !spaces
2134 && emitter->column > emitter->best_width
2135 && string.pointer != string.start
2136 && string.pointer != string.end - 1) {
2137 if (!yaml_emitter_write_indent(emitter)) return 0;
2138 if (IS_SPACE_AT(string, 1)) {
2139 if (!PUT(emitter, '\\')) return 0;
2140 }
2141 MOVE(string);
2142 }
2143 else {
2144 if (!WRITE(emitter, string)) return 0;
2145 }
2146 spaces = 1;
2147 }
2148 else
2149 {
2150 if (!WRITE(emitter, string)) return 0;
2151 spaces = 0;
2152 }
2153 }
2154
2155 if (!yaml_emitter_write_indicator(emitter, "\"", 0, 0, 0))
2156 return 0;
2157
2158 emitter->whitespace = 0;
2159 emitter->indention = 0;
2160
2161 return 1;
2162}
2163
2164static int
2165yaml_emitter_determine_chomping(yaml_emitter_t *emitter,
2166 yaml_string_t string)
2167{
2168 string.pointer = string.end;
2169 if (string.start == string.pointer)
2170 return -1;
6d167281 2171 do {
784340c2 2172 string.pointer --;
6d167281 2173 } while ((*string.pointer & 0xC0) == 0x80);
784340c2
KS		 2174 if (!IS_BREAK(string))
2175 return -1;
2176 if (string.start == string.pointer)
2177 return 0;
6d167281 2178 do {
784340c2 2179 string.pointer --;
6d167281 2180 } while ((*string.pointer & 0xC0) == 0x80);
784340c2
KS		 2181 if (!IS_BREAK(string))
2182 return 0;
2183 return +1;
2184
e35af832
KS		 2185}
2186
2187static int
2188yaml_emitter_write_literal_scalar(yaml_emitter_t *emitter,
2189 yaml_char_t *value, size_t length)
2190{
784340c2
KS		 2191 yaml_string_t string = STRING(value, length);
2192 int chomp = yaml_emitter_determine_chomping(emitter, string);
2193 int breaks = 0;
2194
2195 if (!yaml_emitter_write_indicator(emitter,
2196 chomp == -1 ? "|-" : chomp == +1 ? "|+" : "|", 1, 0, 0))
2197 return 0;
2198 if (!yaml_emitter_write_indent(emitter))
2199 return 0;
2200
2201 while (string.pointer != string.end)
2202 {
2203 if (IS_BREAK(string))
2204 {
2205 if (!WRITE_BREAK(emitter, string)) return 0;
2206 emitter->indention = 1;
2207 breaks = 1;
2208 }
2209 else
2210 {
2211 if (breaks) {
2212 if (!yaml_emitter_write_indent(emitter)) return 0;
2213 }
2214 if (!WRITE(emitter, string)) return 0;
2215 emitter->indention = 0;
2216 breaks = 0;
2217 }
2218 }
2219
784340c2 2220 return 1;
e35af832
KS		 2221}
2222
2223static int
2224yaml_emitter_write_folded_scalar(yaml_emitter_t *emitter,
2225 yaml_char_t *value, size_t length)
2226{
784340c2
KS		 2227 yaml_string_t string = STRING(value, length);
2228 int chomp = yaml_emitter_determine_chomping(emitter, string);
6d167281
KS		 2229 int breaks = 1;
2230 int leading_spaces = 0;
784340c2
KS		 2231
2232 if (!yaml_emitter_write_indicator(emitter,
2233 chomp == -1 ? ">-" : chomp == +1 ? ">+" : ">", 1, 0, 0))
2234 return 0;
2235 if (!yaml_emitter_write_indent(emitter))
2236 return 0;
2237
2238 while (string.pointer != string.end)
2239 {
2240 if (IS_BREAK(string))
2241 {
2242 if (!breaks && !leading_spaces && CHECK(string, '\n')) {
2243 int k = 0;
2244 while (IS_BREAK_AT(string, k)) {
2245 k += WIDTH_AT(string, k);
2246 }
2247 if (!IS_BLANK_AT(string, k)) {
2248 if (!PUT_BREAK(emitter)) return 0;
2249 }
2250 }
2251 if (!WRITE_BREAK(emitter, string)) return 0;
2252 emitter->indention = 1;
2253 breaks = 1;
2254 }
2255 else
2256 {
2257 if (breaks) {
2258 if (!yaml_emitter_write_indent(emitter)) return 0;
2259 leading_spaces = IS_BLANK(string);
2260 }
2261 if (!breaks && IS_SPACE(string) && !IS_SPACE_AT(string, 1)
2262 && emitter->column > emitter->best_width) {
2263 if (!yaml_emitter_write_indent(emitter)) return 0;
2264 MOVE(string);
2265 }
2266 else {
2267 if (!WRITE(emitter, string)) return 0;
2268 }
2269 emitter->indention = 0;
2270 breaks = 0;
2271 }
2272 }
2273
784340c2 2274 return 1;
e35af832
KS		 2275}
2276
Fast YAML 1.1 parser and emitter library
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