@@ -1,3589 +0,0 @@
1−
2−/*
3− * Introduction
4− * ************
5− *
6− * The following notes assume that you are familiar with the YAML specification
7− * (http://yaml.org/spec/cvs/current.html). We mostly follow it, although in
8− * some cases we are less restrictive that it requires.
9− *
10− * The process of transforming a YAML stream into a sequence of events is
11− * divided on two steps: Scanning and Parsing.
12− *
13− * The Scanner transforms the input stream into a sequence of tokens, while the
14− * parser transform the sequence of tokens produced by the Scanner into a
15− * sequence of parsing events.
16− *
17− * The Scanner is rather clever and complicated. The Parser, on the contrary,
18− * is a straightforward implementation of a recursive-descendant parser (or,
19− * LL(1) parser, as it is usually called).
20− *
21− * Actually there are two issues of Scanning that might be called "clever", the
22− * rest is quite straightforward. The issues are "block collection start" and
23− * "simple keys". Both issues are explained below in details.
24− *
25− * Here the Scanning step is explained and implemented. We start with the list
26− * of all the tokens produced by the Scanner together with short descriptions.
27− *
28− * Now, tokens:
29− *
30− * STREAM-START(encoding) # The stream start.
31− * STREAM-END # The stream end.
32− * VERSION-DIRECTIVE(major,minor) # The '%YAML' directive.
33− * TAG-DIRECTIVE(handle,prefix) # The '%TAG' directive.
34− * DOCUMENT-START # '---'
35− * DOCUMENT-END # '...'
36− * BLOCK-SEQUENCE-START # Indentation increase denoting a block
37− * BLOCK-MAPPING-START # sequence or a block mapping.
38− * BLOCK-END # Indentation decrease.
39− * FLOW-SEQUENCE-START # '['
40− * FLOW-SEQUENCE-END # ']'
41− * FLOW-MAPPING-START # '{'
42− * FLOW-MAPPING-END # '}'
43− * BLOCK-ENTRY # '-'
44− * FLOW-ENTRY # ','
45− * KEY # '?' or nothing (simple keys).
46− * VALUE # ':'
47− * ALIAS(anchor) # '*anchor'
48− * ANCHOR(anchor) # '&anchor'
49− * TAG(handle,suffix) # '!handle!suffix'
50− * SCALAR(value,style) # A scalar.
51− *
52− * The following two tokens are "virtual" tokens denoting the beginning and the
53− * end of the stream:
54− *
55− * STREAM-START(encoding)
56− * STREAM-END
57− *
58− * We pass the information about the input stream encoding with the
59− * STREAM-START token.
60− *
61− * The next two tokens are responsible for tags:
62− *
63− * VERSION-DIRECTIVE(major,minor)
64− * TAG-DIRECTIVE(handle,prefix)
65− *
66− * Example:
67− *
68− * %YAML 1.1
69− * %TAG ! !foo
70− * %TAG !yaml! tag:yaml.org,2002:
71− * ---
72− *
73− * The corresponding sequence of tokens:
74− *
75− * STREAM-START(utf-8)
76− * VERSION-DIRECTIVE(1,1)
77− * TAG-DIRECTIVE("!","!foo")
78− * TAG-DIRECTIVE("!yaml","tag:yaml.org,2002:")
79− * DOCUMENT-START
80− * STREAM-END
81− *
82− * Note that the VERSION-DIRECTIVE and TAG-DIRECTIVE tokens occupy a whole
83− * line.
84− *
85− * The document start and end indicators are represented by:
86− *
87− * DOCUMENT-START
88− * DOCUMENT-END
89− *
90− * Note that if a YAML stream contains an implicit document (without '---'
91− * and '...' indicators), no DOCUMENT-START and DOCUMENT-END tokens will be
92− * produced.
93− *
94− * In the following examples, we present whole documents together with the
95− * produced tokens.
96− *
97− * 1. An implicit document:
98− *
99− * 'a scalar'
100− *
101− * Tokens:
102− *
103− * STREAM-START(utf-8)
104− * SCALAR("a scalar",single-quoted)
105− * STREAM-END
106− *
107− * 2. An explicit document:
108− *
109− * ---
110− * 'a scalar'
111− * ...
112− *
113− * Tokens:
114− *
115− * STREAM-START(utf-8)
116− * DOCUMENT-START
117− * SCALAR("a scalar",single-quoted)
118− * DOCUMENT-END
119− * STREAM-END
120− *
121− * 3. Several documents in a stream:
122− *
123− * 'a scalar'
124− * ---
125− * 'another scalar'
126− * ---
127− * 'yet another scalar'
128− *
129− * Tokens:
130− *
131− * STREAM-START(utf-8)
132− * SCALAR("a scalar",single-quoted)
133− * DOCUMENT-START
134− * SCALAR("another scalar",single-quoted)
135− * DOCUMENT-START
136− * SCALAR("yet another scalar",single-quoted)
137− * STREAM-END
138− *
139− * We have already introduced the SCALAR token above. The following tokens are
140− * used to describe aliases, anchors, tag, and scalars:
141− *
142− * ALIAS(anchor)
143− * ANCHOR(anchor)
144− * TAG(handle,suffix)
145− * SCALAR(value,style)
146− *
147− * The following series of examples illustrate the usage of these tokens:
148− *
149− * 1. A recursive sequence:
150− *
151− * &A [ *A ]
152− *
153− * Tokens:
154− *
155− * STREAM-START(utf-8)
156− * ANCHOR("A")
157− * FLOW-SEQUENCE-START
158− * ALIAS("A")
159− * FLOW-SEQUENCE-END
160− * STREAM-END
161− *
162− * 2. A tagged scalar:
163− *
164− * !!float "3.14" # A good approximation.
165− *
166− * Tokens:
167− *
168− * STREAM-START(utf-8)
169− * TAG("!!","float")
170− * SCALAR("3.14",double-quoted)
171− * STREAM-END
172− *
173− * 3. Various scalar styles:
174− *
175− * --- # Implicit empty plain scalars do not produce tokens.
176− * --- a plain scalar
177− * --- 'a single-quoted scalar'
178− * --- "a double-quoted scalar"
179− * --- |-
180− * a literal scalar
181− * --- >-
182− * a folded
183− * scalar
184− *
185− * Tokens:
186− *
187− * STREAM-START(utf-8)
188− * DOCUMENT-START
189− * DOCUMENT-START
190− * SCALAR("a plain scalar",plain)
191− * DOCUMENT-START
192− * SCALAR("a single-quoted scalar",single-quoted)
193− * DOCUMENT-START
194− * SCALAR("a double-quoted scalar",double-quoted)
195− * DOCUMENT-START
196− * SCALAR("a literal scalar",literal)
197− * DOCUMENT-START
198− * SCALAR("a folded scalar",folded)
199− * STREAM-END
200− *
201− * Now it's time to review collection-related tokens. We will start with
202− * flow collections:
203− *
204− * FLOW-SEQUENCE-START
205− * FLOW-SEQUENCE-END
206− * FLOW-MAPPING-START
207− * FLOW-MAPPING-END
208− * FLOW-ENTRY
209− * KEY
210− * VALUE
211− *
212− * The tokens FLOW-SEQUENCE-START, FLOW-SEQUENCE-END, FLOW-MAPPING-START, and
213− * FLOW-MAPPING-END represent the indicators '[', ']', '{', and '}'
214− * correspondingly. FLOW-ENTRY represent the ',' indicator. Finally the
215− * indicators '?' and ':', which are used for denoting mapping keys and values,
216− * are represented by the KEY and VALUE tokens.
217− *
218− * The following examples show flow collections:
219− *
220− * 1. A flow sequence:
221− *
222− * [item 1, item 2, item 3]
223− *
224− * Tokens:
225− *
226− * STREAM-START(utf-8)
227− * FLOW-SEQUENCE-START
228− * SCALAR("item 1",plain)
229− * FLOW-ENTRY
230− * SCALAR("item 2",plain)
231− * FLOW-ENTRY
232− * SCALAR("item 3",plain)
233− * FLOW-SEQUENCE-END
234− * STREAM-END
235− *
236− * 2. A flow mapping:
237− *
238− * {
239− * a simple key: a value, # Note that the KEY token is produced.
240− * ? a complex key: another value,
241− * }
242− *
243− * Tokens:
244− *
245− * STREAM-START(utf-8)
246− * FLOW-MAPPING-START
247− * KEY
248− * SCALAR("a simple key",plain)
249− * VALUE
250− * SCALAR("a value",plain)
251− * FLOW-ENTRY
252− * KEY
253− * SCALAR("a complex key",plain)
254− * VALUE
255− * SCALAR("another value",plain)
256− * FLOW-ENTRY
257− * FLOW-MAPPING-END
258− * STREAM-END
259− *
260− * A simple key is a key which is not denoted by the '?' indicator. Note that
261− * the Scanner still produce the KEY token whenever it encounters a simple key.
262− *
263− * For scanning block collections, the following tokens are used (note that we
264− * repeat KEY and VALUE here):
265− *
266− * BLOCK-SEQUENCE-START
267− * BLOCK-MAPPING-START
268− * BLOCK-END
269− * BLOCK-ENTRY
270− * KEY
271− * VALUE
272− *
273− * The tokens BLOCK-SEQUENCE-START and BLOCK-MAPPING-START denote indentation
274− * increase that precedes a block collection (cf. the INDENT token in Python).
275− * The token BLOCK-END denote indentation decrease that ends a block collection
276− * (cf. the DEDENT token in Python). However YAML has some syntax pecularities
277− * that makes detections of these tokens more complex.
278− *
279− * The tokens BLOCK-ENTRY, KEY, and VALUE are used to represent the indicators
280− * '-', '?', and ':' correspondingly.
281− *
282− * The following examples show how the tokens BLOCK-SEQUENCE-START,
283− * BLOCK-MAPPING-START, and BLOCK-END are emitted by the Scanner:
284− *
285− * 1. Block sequences:
286− *
287− * - item 1
288− * - item 2
289− * -
290− * - item 3.1
291− * - item 3.2
292− * -
293− * key 1: value 1
294− * key 2: value 2
295− *
296− * Tokens:
297− *
298− * STREAM-START(utf-8)
299− * BLOCK-SEQUENCE-START
300− * BLOCK-ENTRY
301− * SCALAR("item 1",plain)
302− * BLOCK-ENTRY
303− * SCALAR("item 2",plain)
304− * BLOCK-ENTRY
305− * BLOCK-SEQUENCE-START
306− * BLOCK-ENTRY
307− * SCALAR("item 3.1",plain)
308− * BLOCK-ENTRY
309− * SCALAR("item 3.2",plain)
310− * BLOCK-END
311− * BLOCK-ENTRY
312− * BLOCK-MAPPING-START
313− * KEY
314− * SCALAR("key 1",plain)
315− * VALUE
316− * SCALAR("value 1",plain)
317− * KEY
318− * SCALAR("key 2",plain)
319− * VALUE
320− * SCALAR("value 2",plain)
321− * BLOCK-END
322− * BLOCK-END
323− * STREAM-END
324− *
325− * 2. Block mappings:
326− *
327− * a simple key: a value # The KEY token is produced here.
328− * ? a complex key
329− * : another value
330− * a mapping:
331− * key 1: value 1
332− * key 2: value 2
333− * a sequence:
334− * - item 1
335− * - item 2
336− *
337− * Tokens:
338− *
339− * STREAM-START(utf-8)
340− * BLOCK-MAPPING-START
341− * KEY
342− * SCALAR("a simple key",plain)
343− * VALUE
344− * SCALAR("a value",plain)
345− * KEY
346− * SCALAR("a complex key",plain)
347− * VALUE
348− * SCALAR("another value",plain)
349− * KEY
350− * SCALAR("a mapping",plain)
351− * BLOCK-MAPPING-START
352− * KEY
353− * SCALAR("key 1",plain)
354− * VALUE
355− * SCALAR("value 1",plain)
356− * KEY
357− * SCALAR("key 2",plain)
358− * VALUE
359− * SCALAR("value 2",plain)
360− * BLOCK-END
361− * KEY
362− * SCALAR("a sequence",plain)
363− * VALUE
364− * BLOCK-SEQUENCE-START
365− * BLOCK-ENTRY
366− * SCALAR("item 1",plain)
367− * BLOCK-ENTRY
368− * SCALAR("item 2",plain)
369− * BLOCK-END
370− * BLOCK-END
371− * STREAM-END
372− *
373− * YAML does not always require to start a new block collection from a new
374− * line. If the current line contains only '-', '?', and ':' indicators, a new
375− * block collection may start at the current line. The following examples
376− * illustrate this case:
377− *
378− * 1. Collections in a sequence:
379− *
380− * - - item 1
381− * - item 2
382− * - key 1: value 1
383− * key 2: value 2
384− * - ? complex key
385− * : complex value
386− *
387− * Tokens:
388− *
389− * STREAM-START(utf-8)
390− * BLOCK-SEQUENCE-START
391− * BLOCK-ENTRY
392− * BLOCK-SEQUENCE-START
393− * BLOCK-ENTRY
394− * SCALAR("item 1",plain)
395− * BLOCK-ENTRY
396− * SCALAR("item 2",plain)
397− * BLOCK-END
398− * BLOCK-ENTRY
399− * BLOCK-MAPPING-START
400− * KEY
401− * SCALAR("key 1",plain)
402− * VALUE
403− * SCALAR("value 1",plain)
404− * KEY
405− * SCALAR("key 2",plain)
406− * VALUE
407− * SCALAR("value 2",plain)
408− * BLOCK-END
409− * BLOCK-ENTRY
410− * BLOCK-MAPPING-START
411− * KEY
412− * SCALAR("complex key")
413− * VALUE
414− * SCALAR("complex value")
415− * BLOCK-END
416− * BLOCK-END
417− * STREAM-END
418− *
419− * 2. Collections in a mapping:
420− *
421− * ? a sequence
422− * : - item 1
423− * - item 2
424− * ? a mapping
425− * : key 1: value 1
426− * key 2: value 2
427− *
428− * Tokens:
429− *
430− * STREAM-START(utf-8)
431− * BLOCK-MAPPING-START
432− * KEY
433− * SCALAR("a sequence",plain)
434− * VALUE
435− * BLOCK-SEQUENCE-START
436− * BLOCK-ENTRY
437− * SCALAR("item 1",plain)
438− * BLOCK-ENTRY
439− * SCALAR("item 2",plain)
440− * BLOCK-END
441− * KEY
442− * SCALAR("a mapping",plain)
443− * VALUE
444− * BLOCK-MAPPING-START
445− * KEY
446− * SCALAR("key 1",plain)
447− * VALUE
448− * SCALAR("value 1",plain)
449− * KEY
450− * SCALAR("key 2",plain)
451− * VALUE
452− * SCALAR("value 2",plain)
453− * BLOCK-END
454− * BLOCK-END
455− * STREAM-END
456− *
457− * YAML also permits non-indented sequences if they are included into a block
458− * mapping. In this case, the token BLOCK-SEQUENCE-START is not produced:
459− *
460− * key:
461− * - item 1 # BLOCK-SEQUENCE-START is NOT produced here.
462− * - item 2
463− *
464− * Tokens:
465− *
466− * STREAM-START(utf-8)
467− * BLOCK-MAPPING-START
468− * KEY
469− * SCALAR("key",plain)
470− * VALUE
471− * BLOCK-ENTRY
472− * SCALAR("item 1",plain)
473− * BLOCK-ENTRY
474− * SCALAR("item 2",plain)
475− * BLOCK-END
476− */
477−
478−#include "yaml_private.h"
479−
480−/*
481− * Ensure that the buffer contains the required number of characters.
482− * Return 1 on success, 0 on failure (reader error or memory error).
483− */
484−
485−#define CACHE(parser,length) \
486− (parser->unread >= (length) \
487− ? 1 \
488− : yaml_parser_update_buffer(parser, (length)))
489−
490−/*
491− * Advance the buffer pointer.
492− */
493−
494−#define SKIP(parser) \
495− (parser->mark.index ++, \
496− parser->mark.column ++, \
497− parser->unread --, \
498− parser->buffer.pointer += WIDTH(parser->buffer))
499−
500−#define SKIP_LINE(parser) \
501− (IS_CRLF(parser->buffer) ? \
502− (parser->mark.index += 2, \
503− parser->mark.column = 0, \
504− parser->mark.line ++, \
505− parser->unread -= 2, \
506− parser->buffer.pointer += 2) : \
507− IS_BREAK(parser->buffer) ? \
508− (parser->mark.index ++, \
509− parser->mark.column = 0, \
510− parser->mark.line ++, \
511− parser->unread --, \
512− parser->buffer.pointer += WIDTH(parser->buffer)) : 0)
513−
514−/*
515− * Copy a character to a string buffer and advance pointers.
516− */
517−
518−#define READ(parser,string) \
519− (STRING_EXTEND(parser,string) ? \
520− (COPY(string,parser->buffer), \
521− parser->mark.index ++, \
522− parser->mark.column ++, \
523− parser->unread --, \
524− 1) : 0)
525−
526−/*
527− * Copy a line break character to a string buffer and advance pointers.
528− */
529−
530−#define READ_LINE(parser,string) \
531− (STRING_EXTEND(parser,string) ? \
532− (((CHECK_AT(parser->buffer,'\r',0) \
533− && CHECK_AT(parser->buffer,'\n',1)) ? /* CR LF -> LF */ \
534− (*((string).pointer++) = (yaml_char_t) '\n', \
535− parser->buffer.pointer += 2, \
536− parser->mark.index += 2, \
537− parser->mark.column = 0, \
538− parser->mark.line ++, \
539− parser->unread -= 2) : \
540− (CHECK_AT(parser->buffer,'\r',0) \
541− || CHECK_AT(parser->buffer,'\n',0)) ? /* CR|LF -> LF */ \
542− (*((string).pointer++) = (yaml_char_t) '\n', \
543− parser->buffer.pointer ++, \
544− parser->mark.index ++, \
545− parser->mark.column = 0, \
546− parser->mark.line ++, \
547− parser->unread --) : \
548− (CHECK_AT(parser->buffer,'\xC2',0) \
549− && CHECK_AT(parser->buffer,'\x85',1)) ? /* NEL -> LF */ \
550− (*((string).pointer++) = (yaml_char_t) '\n', \
551− parser->buffer.pointer += 2, \
552− parser->mark.index ++, \
553− parser->mark.column = 0, \
554− parser->mark.line ++, \
555− parser->unread --) : \
556− (CHECK_AT(parser->buffer,'\xE2',0) && \
557− CHECK_AT(parser->buffer,'\x80',1) && \
558− (CHECK_AT(parser->buffer,'\xA8',2) || \
559− CHECK_AT(parser->buffer,'\xA9',2))) ? /* LS|PS -> LS|PS */ \
560− (*((string).pointer++) = *(parser->buffer.pointer++), \
561− *((string).pointer++) = *(parser->buffer.pointer++), \
562− *((string).pointer++) = *(parser->buffer.pointer++), \
563− parser->mark.index ++, \
564− parser->mark.column = 0, \
565− parser->mark.line ++, \
566− parser->unread --) : 0), \
567− 1) : 0)
568−
569−/*
570− * Public API declarations.
571− */
572−
573−YAML_DECLARE(int)
574−yaml_parser_scan(yaml_parser_t *parser, yaml_token_t *token);
575−
576−/*
577− * Error handling.
578− */
579−
580−static int
581−yaml_parser_set_scanner_error(yaml_parser_t *parser, const char *context,
582− yaml_mark_t context_mark, const char *problem);
583−
584−/*
585− * High-level token API.
586− */
587−
588−YAML_DECLARE(int)
589−yaml_parser_fetch_more_tokens(yaml_parser_t *parser);
590−
591−static int
592−yaml_parser_fetch_next_token(yaml_parser_t *parser);
593−
594−/*
595− * Potential simple keys.
596− */
597−
598−static int
599−yaml_parser_stale_simple_keys(yaml_parser_t *parser);
600−
601−static int
602−yaml_parser_save_simple_key(yaml_parser_t *parser);
603−
604−static int
605−yaml_parser_remove_simple_key(yaml_parser_t *parser);
606−
607−static int
608−yaml_parser_increase_flow_level(yaml_parser_t *parser);
609−
610−static int
611−yaml_parser_decrease_flow_level(yaml_parser_t *parser);
612−
613−/*
614− * Indentation treatment.
615− */
616−
617−static int
618−yaml_parser_roll_indent(yaml_parser_t *parser, ptrdiff_t column,
619− ptrdiff_t number, yaml_token_type_t type, yaml_mark_t mark);
620−
621−static int
622−yaml_parser_unroll_indent(yaml_parser_t *parser, ptrdiff_t column);
623−
624−/*
625− * Token fetchers.
626− */
627−
628−static int
629−yaml_parser_fetch_stream_start(yaml_parser_t *parser);
630−
631−static int
632−yaml_parser_fetch_stream_end(yaml_parser_t *parser);
633−
634−static int
635−yaml_parser_fetch_directive(yaml_parser_t *parser);
636−
637−static int
638−yaml_parser_fetch_document_indicator(yaml_parser_t *parser,
639− yaml_token_type_t type);
640−
641−static int
642−yaml_parser_fetch_flow_collection_start(yaml_parser_t *parser,
643− yaml_token_type_t type);
644−
645−static int
646−yaml_parser_fetch_flow_collection_end(yaml_parser_t *parser,
647− yaml_token_type_t type);
648−
649−static int
650−yaml_parser_fetch_flow_entry(yaml_parser_t *parser);
651−
652−static int
653−yaml_parser_fetch_block_entry(yaml_parser_t *parser);
654−
655−static int
656−yaml_parser_fetch_key(yaml_parser_t *parser);
657−
658−static int
659−yaml_parser_fetch_value(yaml_parser_t *parser);
660−
661−static int
662−yaml_parser_fetch_anchor(yaml_parser_t *parser, yaml_token_type_t type);
663−
664−static int
665−yaml_parser_fetch_tag(yaml_parser_t *parser);
666−
667−static int
668−yaml_parser_fetch_block_scalar(yaml_parser_t *parser, int literal);
669−
670−static int
671−yaml_parser_fetch_flow_scalar(yaml_parser_t *parser, int single);
672−
673−static int
674−yaml_parser_fetch_plain_scalar(yaml_parser_t *parser);
675−
676−/*
677− * Token scanners.
678− */
679−
680−static int
681−yaml_parser_scan_to_next_token(yaml_parser_t *parser);
682−
683−static int
684−yaml_parser_scan_directive(yaml_parser_t *parser, yaml_token_t *token);
685−
686−static int
687−yaml_parser_scan_directive_name(yaml_parser_t *parser,
688− yaml_mark_t start_mark, yaml_char_t **name);
689−
690−static int
691−yaml_parser_scan_version_directive_value(yaml_parser_t *parser,
692− yaml_mark_t start_mark, int *major, int *minor);
693−
694−static int
695−yaml_parser_scan_version_directive_number(yaml_parser_t *parser,
696− yaml_mark_t start_mark, int *number);
697−
698−static int
699−yaml_parser_scan_tag_directive_value(yaml_parser_t *parser,
700− yaml_mark_t mark, yaml_char_t **handle, yaml_char_t **prefix);
701−
702−static int
703−yaml_parser_scan_anchor(yaml_parser_t *parser, yaml_token_t *token,
704− yaml_token_type_t type);
705−
706−static int
707−yaml_parser_scan_tag(yaml_parser_t *parser, yaml_token_t *token);
708−
709−static int
710−yaml_parser_scan_tag_handle(yaml_parser_t *parser, int directive,
711− yaml_mark_t start_mark, yaml_char_t **handle);
712−
713−static int
714−yaml_parser_scan_tag_uri(yaml_parser_t *parser, int directive,
715− yaml_char_t *head, yaml_mark_t start_mark, yaml_char_t **uri);
716−
717−static int
718−yaml_parser_scan_uri_escapes(yaml_parser_t *parser, int directive,
719− yaml_mark_t start_mark, yaml_string_t *string);
720−
721−static int
722−yaml_parser_scan_block_scalar(yaml_parser_t *parser, yaml_token_t *token,
723− int literal);
724−
725−static int
726−yaml_parser_scan_block_scalar_breaks(yaml_parser_t *parser,
727− int *indent, yaml_string_t *breaks,
728− yaml_mark_t start_mark, yaml_mark_t *end_mark);
729−
730−static int
731−yaml_parser_scan_flow_scalar(yaml_parser_t *parser, yaml_token_t *token,
732− int single);
733−
734−static int
735−yaml_parser_scan_plain_scalar(yaml_parser_t *parser, yaml_token_t *token);
736−
737−/*
738− * Get the next token.
739− */
740−
741−YAML_DECLARE(int)
742−yaml_parser_scan(yaml_parser_t *parser, yaml_token_t *token)
743−{
744− assert(parser); /* Non-NULL parser object is expected. */
745− assert(token); /* Non-NULL token object is expected. */
746−
747− /* Erase the token object. */
748−
749− memset(token, 0, sizeof(yaml_token_t));
750−
751− /* No tokens after STREAM-END or error. */
752−
753− if (parser->stream_end_produced || parser->error) {
754− return 1;
755− }
756−
757− /* Ensure that the tokens queue contains enough tokens. */
758−
759− if (!parser->token_available) {
760− if (!yaml_parser_fetch_more_tokens(parser))
761− return 0;
762− }
763−
764− /* Fetch the next token from the queue. */
765−
766− *token = DEQUEUE(parser, parser->tokens);
767− parser->token_available = 0;
768− parser->tokens_parsed ++;
769−
770− if (token->type == YAML_STREAM_END_TOKEN) {
771− parser->stream_end_produced = 1;
772− }
773−
774− return 1;
775−}
776−
777−/*
778− * Set the scanner error and return 0.
779− */
780−
781−static int
782−yaml_parser_set_scanner_error(yaml_parser_t *parser, const char *context,
783− yaml_mark_t context_mark, const char *problem)
784−{
785− parser->error = YAML_SCANNER_ERROR;
786− parser->context = context;
787− parser->context_mark = context_mark;
788− parser->problem = problem;
789− parser->problem_mark = parser->mark;
790−
791− return 0;
792−}
793−
794−/*
795− * Ensure that the tokens queue contains at least one token which can be
796− * returned to the Parser.
797− */
798−
799−YAML_DECLARE(int)
800−yaml_parser_fetch_more_tokens(yaml_parser_t *parser)
801−{
802− int need_more_tokens;
803−
804− /* While we need more tokens to fetch, do it. */
805−
806− while (1)
807− {
808− /*
809− * Check if we really need to fetch more tokens.
810− */
811−
812− need_more_tokens = 0;
813−
814− if (parser->tokens.head == parser->tokens.tail)
815− {
816− /* Queue is empty. */
817−
818− need_more_tokens = 1;
819− }
820− else
821− {
822− yaml_simple_key_t *simple_key;
823−
824− /* Check if any potential simple key may occupy the head position. */
825−
826− if (!yaml_parser_stale_simple_keys(parser))
827− return 0;
828−
829− for (simple_key = parser->simple_keys.start;
830− simple_key != parser->simple_keys.top; simple_key++) {
831− if (simple_key->possible
832− && simple_key->token_number == parser->tokens_parsed) {
833− need_more_tokens = 1;
834− break;
835− }
836− }
837− }
838−
839− /* We are finished. */
840−
841− if (!need_more_tokens)
842− break;
843−
844− /* Fetch the next token. */
845−
846− if (!yaml_parser_fetch_next_token(parser))
847− return 0;
848− }
849−
850− parser->token_available = 1;
851−
852− return 1;
853−}
854−
855−/*
856− * The dispatcher for token fetchers.
857− */
858−
859−static int
860−yaml_parser_fetch_next_token(yaml_parser_t *parser)
861−{
862− /* Ensure that the buffer is initialized. */
863−
864− if (!CACHE(parser, 1))
865− return 0;
866−
867− /* Check if we just started scanning. Fetch STREAM-START then. */
868−
869− if (!parser->stream_start_produced)
870− return yaml_parser_fetch_stream_start(parser);
871−
872− /* Eat whitespaces and comments until we reach the next token. */
873−
874− if (!yaml_parser_scan_to_next_token(parser))
875− return 0;
876−
877− /* Remove obsolete potential simple keys. */
878−
879− if (!yaml_parser_stale_simple_keys(parser))
880− return 0;
881−
882− /* Check the indentation level against the current column. */
883−
884− if (!yaml_parser_unroll_indent(parser, parser->mark.column))
885− return 0;
886−
887− /*
888− * Ensure that the buffer contains at least 4 characters. 4 is the length
889− * of the longest indicators ('--- ' and '... ').
890− */
891−
892− if (!CACHE(parser, 4))
893− return 0;
894−
895− /* Is it the end of the stream? */
896−
897− if (IS_Z(parser->buffer))
898− return yaml_parser_fetch_stream_end(parser);
899−
900− /* Is it a directive? */
901−
902− if (parser->mark.column == 0 && CHECK(parser->buffer, '%'))
903− return yaml_parser_fetch_directive(parser);
904−
905− /* Is it the document start indicator? */
906−
907− if (parser->mark.column == 0
908− && CHECK_AT(parser->buffer, '-', 0)
909− && CHECK_AT(parser->buffer, '-', 1)
910− && CHECK_AT(parser->buffer, '-', 2)
911− && IS_BLANKZ_AT(parser->buffer, 3))
912− return yaml_parser_fetch_document_indicator(parser,
913− YAML_DOCUMENT_START_TOKEN);
914−
915− /* Is it the document end indicator? */
916−
917− if (parser->mark.column == 0
918− && CHECK_AT(parser->buffer, '.', 0)
919− && CHECK_AT(parser->buffer, '.', 1)
920− && CHECK_AT(parser->buffer, '.', 2)
921− && IS_BLANKZ_AT(parser->buffer, 3))
922− return yaml_parser_fetch_document_indicator(parser,
923− YAML_DOCUMENT_END_TOKEN);
924−
925− /* Is it the flow sequence start indicator? */
926−
927− if (CHECK(parser->buffer, '['))
928− return yaml_parser_fetch_flow_collection_start(parser,
929− YAML_FLOW_SEQUENCE_START_TOKEN);
930−
931− /* Is it the flow mapping start indicator? */
932−
933− if (CHECK(parser->buffer, '{'))
934− return yaml_parser_fetch_flow_collection_start(parser,
935− YAML_FLOW_MAPPING_START_TOKEN);
936−
937− /* Is it the flow sequence end indicator? */
938−
939− if (CHECK(parser->buffer, ']'))
940− return yaml_parser_fetch_flow_collection_end(parser,
941− YAML_FLOW_SEQUENCE_END_TOKEN);
942−
943− /* Is it the flow mapping end indicator? */
944−
945− if (CHECK(parser->buffer, '}'))
946− return yaml_parser_fetch_flow_collection_end(parser,
947− YAML_FLOW_MAPPING_END_TOKEN);
948−
949− /* Is it the flow entry indicator? */
950−
951− if (CHECK(parser->buffer, ','))
952− return yaml_parser_fetch_flow_entry(parser);
953−
954− /* Is it the block entry indicator? */
955−
956− if (CHECK(parser->buffer, '-') && IS_BLANKZ_AT(parser->buffer, 1))
957− return yaml_parser_fetch_block_entry(parser);
958−
959− /* Is it the key indicator? */
960−
961− if (CHECK(parser->buffer, '?')
962− && (parser->flow_level || IS_BLANKZ_AT(parser->buffer, 1)))
963− return yaml_parser_fetch_key(parser);
964−
965− /* Is it the value indicator? */
966−
967− if (CHECK(parser->buffer, ':')
968− && (parser->flow_level || IS_BLANKZ_AT(parser->buffer, 1)))
969− return yaml_parser_fetch_value(parser);
970−
971− /* Is it an alias? */
972−
973− if (CHECK(parser->buffer, '*'))
974− return yaml_parser_fetch_anchor(parser, YAML_ALIAS_TOKEN);
975−
976− /* Is it an anchor? */
977−
978− if (CHECK(parser->buffer, '&'))
979− return yaml_parser_fetch_anchor(parser, YAML_ANCHOR_TOKEN);
980−
981− /* Is it a tag? */
982−
983− if (CHECK(parser->buffer, '!'))
984− return yaml_parser_fetch_tag(parser);
985−
986− /* Is it a literal scalar? */
987−
988− if (CHECK(parser->buffer, '|') && !parser->flow_level)
989− return yaml_parser_fetch_block_scalar(parser, 1);
990−
991− /* Is it a folded scalar? */
992−
993− if (CHECK(parser->buffer, '>') && !parser->flow_level)
994− return yaml_parser_fetch_block_scalar(parser, 0);
995−
996− /* Is it a single-quoted scalar? */
997−
998− if (CHECK(parser->buffer, '\''))
999− return yaml_parser_fetch_flow_scalar(parser, 1);
1000−
1001− /* Is it a double-quoted scalar? */
1002−
1003− if (CHECK(parser->buffer, '"'))
1004− return yaml_parser_fetch_flow_scalar(parser, 0);
1005−
1006− /*
1007− * Is it a plain scalar?
1008− *
1009− * A plain scalar may start with any non-blank characters except
1010− *
1011− * '-', '?', ':', ',', '[', ']', '{', '}',
1012− * '#', '&', '*', '!', '|', '>', '\'', '\"',
1013− * '%', '@', '`'.
1014− *
1015− * In the block context (and, for the '-' indicator, in the flow context
1016− * too), it may also start with the characters
1017− *
1018− * '-', '?', ':'
1019− *
1020− * if it is followed by a non-space character.
1021− *
1022− * The last rule is more restrictive than the specification requires.
1023− */
1024−
1025− if (!(IS_BLANKZ(parser->buffer) || CHECK(parser->buffer, '-')
1026− || CHECK(parser->buffer, '?') || CHECK(parser->buffer, ':')
1027− || CHECK(parser->buffer, ',') || CHECK(parser->buffer, '[')
1028− || CHECK(parser->buffer, ']') || CHECK(parser->buffer, '{')
1029− || CHECK(parser->buffer, '}') || CHECK(parser->buffer, '#')
1030− || CHECK(parser->buffer, '&') || CHECK(parser->buffer, '*')
1031− || CHECK(parser->buffer, '!') || CHECK(parser->buffer, '|')
1032− || CHECK(parser->buffer, '>') || CHECK(parser->buffer, '\'')
1033− || CHECK(parser->buffer, '"') || CHECK(parser->buffer, '%')
1034− || CHECK(parser->buffer, '@') || CHECK(parser->buffer, '`')) ||
1035− (CHECK(parser->buffer, '-') && !IS_BLANK_AT(parser->buffer, 1)) ||
1036− (!parser->flow_level &&
1037− (CHECK(parser->buffer, '?') || CHECK(parser->buffer, ':'))
1038− && !IS_BLANKZ_AT(parser->buffer, 1)))
1039− return yaml_parser_fetch_plain_scalar(parser);
1040−
1041− /*
1042− * If we don't determine the token type so far, it is an error.
1043− */
1044−
1045− return yaml_parser_set_scanner_error(parser,
1046− "while scanning for the next token", parser->mark,
1047− "found character that cannot start any token");
1048−}
1049−
1050−/*
1051− * Check the list of potential simple keys and remove the positions that
1052− * cannot contain simple keys anymore.
1053− */
1054−
1055−static int
1056−yaml_parser_stale_simple_keys(yaml_parser_t *parser)
1057−{
1058− yaml_simple_key_t *simple_key;
1059−
1060− /* Check for a potential simple key for each flow level. */
1061−
1062− for (simple_key = parser->simple_keys.start;
1063− simple_key != parser->simple_keys.top; simple_key ++)
1064− {
1065− /*
1066− * The specification requires that a simple key
1067− *
1068− * - is limited to a single line,
1069− * - is shorter than 1024 characters.
1070− */
1071−
1072− if (simple_key->possible
1073− && (simple_key->mark.line < parser->mark.line
1074− || simple_key->mark.index+1024 < parser->mark.index)) {
1075−
1076− /* Check if the potential simple key to be removed is required. */
1077−
1078− if (simple_key->required) {
1079− return yaml_parser_set_scanner_error(parser,
1080− "while scanning a simple key", simple_key->mark,
1081− "could not find expected ':'");
1082− }
1083−
1084− simple_key->possible = 0;
1085− }
1086− }
1087−
1088− return 1;
1089−}
1090−
1091−/*
1092− * Check if a simple key may start at the current position and add it if
1093− * needed.
1094− */
1095−
1096−static int
1097−yaml_parser_save_simple_key(yaml_parser_t *parser)
1098−{
1099− /*
1100− * A simple key is required at the current position if the scanner is in
1101− * the block context and the current column coincides with the indentation
1102− * level.
1103− */
1104−
1105− int required = (!parser->flow_level
1106− && parser->indent == (ptrdiff_t)parser->mark.column);
1107−
1108− /*
1109− * If the current position may start a simple key, save it.
1110− */
1111−
1112− if (parser->simple_key_allowed)
1113− {
1114− yaml_simple_key_t simple_key;
1115− simple_key.possible = 1;
1116− simple_key.required = required;
1117− simple_key.token_number =
1118− parser->tokens_parsed + (parser->tokens.tail - parser->tokens.head);
1119− simple_key.mark = parser->mark;
1120−
1121− if (!yaml_parser_remove_simple_key(parser)) return 0;
1122−
1123− *(parser->simple_keys.top-1) = simple_key;
1124− }
1125−
1126− return 1;
1127−}
1128−
1129−/*
1130− * Remove a potential simple key at the current flow level.
1131− */
1132−
1133−static int
1134−yaml_parser_remove_simple_key(yaml_parser_t *parser)
1135−{
1136− yaml_simple_key_t *simple_key = parser->simple_keys.top-1;
1137−
1138− if (simple_key->possible)
1139− {
1140− /* If the key is required, it is an error. */
1141−
1142− if (simple_key->required) {
1143− return yaml_parser_set_scanner_error(parser,
1144− "while scanning a simple key", simple_key->mark,
1145− "could not find expected ':'");
1146− }
1147− }
1148−
1149− /* Remove the key from the stack. */
1150−
1151− simple_key->possible = 0;
1152−
1153− return 1;
1154−}
1155−
1156−/*
1157− * Increase the flow level and resize the simple key list if needed.
1158− */
1159−
1160−static int
1161−yaml_parser_increase_flow_level(yaml_parser_t *parser)
1162−{
1163− yaml_simple_key_t empty_simple_key = { 0, 0, 0, { 0, 0, 0 } };
1164−
1165− /* Reset the simple key on the next level. */
1166−
1167− if (!PUSH(parser, parser->simple_keys, empty_simple_key))
1168− return 0;
1169−
1170− /* Increase the flow level. */
1171−
1172− if (parser->flow_level == INT_MAX) {
1173− parser->error = YAML_MEMORY_ERROR;
1174− return 0;
1175− }
1176−
1177− parser->flow_level++;
1178−
1179− return 1;
1180−}
1181−
1182−/*
1183− * Decrease the flow level.
1184− */
1185−
1186−static int
1187−yaml_parser_decrease_flow_level(yaml_parser_t *parser)
1188−{
1189− if (parser->flow_level) {
1190− parser->flow_level --;
1191− (void)POP(parser, parser->simple_keys);
1192− }
1193−
1194− return 1;
1195−}
1196−
1197−/*
1198− * Push the current indentation level to the stack and set the new level
1199− * the current column is greater than the indentation level. In this case,
1200− * append or insert the specified token into the token queue.
1201− *
1202− */
1203−
1204−static int
1205−yaml_parser_roll_indent(yaml_parser_t *parser, ptrdiff_t column,
1206− ptrdiff_t number, yaml_token_type_t type, yaml_mark_t mark)
1207−{
1208− yaml_token_t token;
1209−
1210− /* In the flow context, do nothing. */
1211−
1212− if (parser->flow_level)
1213− return 1;
1214−
1215− if (parser->indent < column)
1216− {
1217− /*
1218− * Push the current indentation level to the stack and set the new
1219− * indentation level.
1220− */
1221−
1222− if (!PUSH(parser, parser->indents, parser->indent))
1223− return 0;
1224−
1225− if (column > INT_MAX) {
1226− parser->error = YAML_MEMORY_ERROR;
1227− return 0;
1228− }
1229−
1230− parser->indent = column;
1231−
1232− /* Create a token and insert it into the queue. */
1233−
1234− TOKEN_INIT(token, type, mark, mark);
1235−
1236− if (number == -1) {
1237− if (!ENQUEUE(parser, parser->tokens, token))
1238− return 0;
1239− }
1240− else {
1241− if (!QUEUE_INSERT(parser,
1242− parser->tokens, number - parser->tokens_parsed, token))
1243− return 0;
1244− }
1245− }
1246−
1247− return 1;
1248−}
1249−
1250−/*
1251− * Pop indentation levels from the indents stack until the current level
1252− * becomes less or equal to the column. For each indentation level, append
1253− * the BLOCK-END token.
1254− */
1255−
1256−
1257−static int
1258−yaml_parser_unroll_indent(yaml_parser_t *parser, ptrdiff_t column)
1259−{
1260− yaml_token_t token;
1261−
1262− /* In the flow context, do nothing. */
1263−
1264− if (parser->flow_level)
1265− return 1;
1266−
1267− /* Loop through the indentation levels in the stack. */
1268−
1269− while (parser->indent > column)
1270− {
1271− /* Create a token and append it to the queue. */
1272−
1273− TOKEN_INIT(token, YAML_BLOCK_END_TOKEN, parser->mark, parser->mark);
1274−
1275− if (!ENQUEUE(parser, parser->tokens, token))
1276− return 0;
1277−
1278− /* Pop the indentation level. */
1279−
1280− parser->indent = POP(parser, parser->indents);
1281− }
1282−
1283− return 1;
1284−}
1285−
1286−/*
1287− * Initialize the scanner and produce the STREAM-START token.
1288− */
1289−
1290−static int
1291−yaml_parser_fetch_stream_start(yaml_parser_t *parser)
1292−{
1293− yaml_simple_key_t simple_key = { 0, 0, 0, { 0, 0, 0 } };
1294− yaml_token_t token;
1295−
1296− /* Set the initial indentation. */
1297−
1298− parser->indent = -1;
1299−
1300− /* Initialize the simple key stack. */
1301−
1302− if (!PUSH(parser, parser->simple_keys, simple_key))
1303− return 0;
1304−
1305− /* A simple key is allowed at the beginning of the stream. */
1306−
1307− parser->simple_key_allowed = 1;
1308−
1309− /* We have started. */
1310−
1311− parser->stream_start_produced = 1;
1312−
1313− /* Create the STREAM-START token and append it to the queue. */
1314−
1315− STREAM_START_TOKEN_INIT(token, parser->encoding,
1316− parser->mark, parser->mark);
1317−
1318− if (!ENQUEUE(parser, parser->tokens, token))
1319− return 0;
1320−
1321− return 1;
1322−}
1323−
1324−/*
1325− * Produce the STREAM-END token and shut down the scanner.
1326− */
1327−
1328−static int
1329−yaml_parser_fetch_stream_end(yaml_parser_t *parser)
1330−{
1331− yaml_token_t token;
1332−
1333− /* Force new line. */
1334−
1335− if (parser->mark.column != 0) {
1336− parser->mark.column = 0;
1337− parser->mark.line ++;
1338− }
1339−
1340− /* Reset the indentation level. */
1341−
1342− if (!yaml_parser_unroll_indent(parser, -1))
1343− return 0;
1344−
1345− /* Reset simple keys. */
1346−
1347− if (!yaml_parser_remove_simple_key(parser))
1348− return 0;
1349−
1350− parser->simple_key_allowed = 0;
1351−
1352− /* Create the STREAM-END token and append it to the queue. */
1353−
1354− STREAM_END_TOKEN_INIT(token, parser->mark, parser->mark);
1355−
1356− if (!ENQUEUE(parser, parser->tokens, token))
1357− return 0;
1358−
1359− return 1;
1360−}
1361−
1362−/*
1363− * Produce a VERSION-DIRECTIVE or TAG-DIRECTIVE token.
1364− */
1365−
1366−static int
1367−yaml_parser_fetch_directive(yaml_parser_t *parser)
1368−{
1369− yaml_token_t token;
1370−
1371− /* Reset the indentation level. */
1372−
1373− if (!yaml_parser_unroll_indent(parser, -1))
1374− return 0;
1375−
1376− /* Reset simple keys. */
1377−
1378− if (!yaml_parser_remove_simple_key(parser))
1379− return 0;
1380−
1381− parser->simple_key_allowed = 0;
1382−
1383− /* Create the YAML-DIRECTIVE or TAG-DIRECTIVE token. */
1384−
1385− if (!yaml_parser_scan_directive(parser, &token))
1386− return 0;
1387−
1388− /* Append the token to the queue. */
1389−
1390− if (!ENQUEUE(parser, parser->tokens, token)) {
1391− yaml_token_delete(&token);
1392− return 0;
1393− }
1394−
1395− return 1;
1396−}
1397−
1398−/*
1399− * Produce the DOCUMENT-START or DOCUMENT-END token.
1400− */
1401−
1402−static int
1403−yaml_parser_fetch_document_indicator(yaml_parser_t *parser,
1404− yaml_token_type_t type)
1405−{
1406− yaml_mark_t start_mark, end_mark;
1407− yaml_token_t token;
1408−
1409− /* Reset the indentation level. */
1410−
1411− if (!yaml_parser_unroll_indent(parser, -1))
1412− return 0;
1413−
1414− /* Reset simple keys. */
1415−
1416− if (!yaml_parser_remove_simple_key(parser))
1417− return 0;
1418−
1419− parser->simple_key_allowed = 0;
1420−
1421− /* Consume the token. */
1422−
1423− start_mark = parser->mark;
1424−
1425− SKIP(parser);
1426− SKIP(parser);
1427− SKIP(parser);
1428−
1429− end_mark = parser->mark;
1430−
1431− /* Create the DOCUMENT-START or DOCUMENT-END token. */
1432−
1433− TOKEN_INIT(token, type, start_mark, end_mark);
1434−
1435− /* Append the token to the queue. */
1436−
1437− if (!ENQUEUE(parser, parser->tokens, token))
1438− return 0;
1439−
1440− return 1;
1441−}
1442−
1443−/*
1444− * Produce the FLOW-SEQUENCE-START or FLOW-MAPPING-START token.
1445− */
1446−
1447−static int
1448−yaml_parser_fetch_flow_collection_start(yaml_parser_t *parser,
1449− yaml_token_type_t type)
1450−{
1451− yaml_mark_t start_mark, end_mark;
1452− yaml_token_t token;
1453−
1454− /* The indicators '[' and '{' may start a simple key. */
1455−
1456− if (!yaml_parser_save_simple_key(parser))
1457− return 0;
1458−
1459− /* Increase the flow level. */
1460−
1461− if (!yaml_parser_increase_flow_level(parser))
1462− return 0;
1463−
1464− /* A simple key may follow the indicators '[' and '{'. */
1465−
1466− parser->simple_key_allowed = 1;
1467−
1468− /* Consume the token. */
1469−
1470− start_mark = parser->mark;
1471− SKIP(parser);
1472− end_mark = parser->mark;
1473−
1474− /* Create the FLOW-SEQUENCE-START of FLOW-MAPPING-START token. */
1475−
1476− TOKEN_INIT(token, type, start_mark, end_mark);
1477−
1478− /* Append the token to the queue. */
1479−
1480− if (!ENQUEUE(parser, parser->tokens, token))
1481− return 0;
1482−
1483− return 1;
1484−}
1485−
1486−/*
1487− * Produce the FLOW-SEQUENCE-END or FLOW-MAPPING-END token.
1488− */
1489−
1490−static int
1491−yaml_parser_fetch_flow_collection_end(yaml_parser_t *parser,
1492− yaml_token_type_t type)
1493−{
1494− yaml_mark_t start_mark, end_mark;
1495− yaml_token_t token;
1496−
1497− /* Reset any potential simple key on the current flow level. */
1498−
1499− if (!yaml_parser_remove_simple_key(parser))
1500− return 0;
1501−
1502− /* Decrease the flow level. */
1503−
1504− if (!yaml_parser_decrease_flow_level(parser))
1505− return 0;
1506−
1507− /* No simple keys after the indicators ']' and '}'. */
1508−
1509− parser->simple_key_allowed = 0;
1510−
1511− /* Consume the token. */
1512−
1513− start_mark = parser->mark;
1514− SKIP(parser);
1515− end_mark = parser->mark;
1516−
1517− /* Create the FLOW-SEQUENCE-END of FLOW-MAPPING-END token. */
1518−
1519− TOKEN_INIT(token, type, start_mark, end_mark);
1520−
1521− /* Append the token to the queue. */
1522−
1523− if (!ENQUEUE(parser, parser->tokens, token))
1524− return 0;
1525−
1526− return 1;
1527−}
1528−
1529−/*
1530− * Produce the FLOW-ENTRY token.
1531− */
1532−
1533−static int
1534−yaml_parser_fetch_flow_entry(yaml_parser_t *parser)
1535−{
1536− yaml_mark_t start_mark, end_mark;
1537− yaml_token_t token;
1538−
1539− /* Reset any potential simple keys on the current flow level. */
1540−
1541− if (!yaml_parser_remove_simple_key(parser))
1542− return 0;
1543−
1544− /* Simple keys are allowed after ','. */
1545−
1546− parser->simple_key_allowed = 1;
1547−
1548− /* Consume the token. */
1549−
1550− start_mark = parser->mark;
1551− SKIP(parser);
1552− end_mark = parser->mark;
1553−
1554− /* Create the FLOW-ENTRY token and append it to the queue. */
1555−
1556− TOKEN_INIT(token, YAML_FLOW_ENTRY_TOKEN, start_mark, end_mark);
1557−
1558− if (!ENQUEUE(parser, parser->tokens, token))
1559− return 0;
1560−
1561− return 1;
1562−}
1563−
1564−/*
1565− * Produce the BLOCK-ENTRY token.
1566− */
1567−
1568−static int
1569−yaml_parser_fetch_block_entry(yaml_parser_t *parser)
1570−{
1571− yaml_mark_t start_mark, end_mark;
1572− yaml_token_t token;
1573−
1574− /* Check if the scanner is in the block context. */
1575−
1576− if (!parser->flow_level)
1577− {
1578− /* Check if we are allowed to start a new entry. */
1579−
1580− if (!parser->simple_key_allowed) {
1581− return yaml_parser_set_scanner_error(parser, NULL, parser->mark,
1582− "block sequence entries are not allowed in this context");
1583− }
1584−
1585− /* Add the BLOCK-SEQUENCE-START token if needed. */
1586−
1587− if (!yaml_parser_roll_indent(parser, parser->mark.column, -1,
1588− YAML_BLOCK_SEQUENCE_START_TOKEN, parser->mark))
1589− return 0;
1590− }
1591− else
1592− {
1593− /*
1594− * It is an error for the '-' indicator to occur in the flow context,
1595− * but we let the Parser detect and report about it because the Parser
1596− * is able to point to the context.
1597− */
1598− }
1599−
1600− /* Reset any potential simple keys on the current flow level. */
1601−
1602− if (!yaml_parser_remove_simple_key(parser))
1603− return 0;
1604−
1605− /* Simple keys are allowed after '-'. */
1606−
1607− parser->simple_key_allowed = 1;
1608−
1609− /* Consume the token. */
1610−
1611− start_mark = parser->mark;
1612− SKIP(parser);
1613− end_mark = parser->mark;
1614−
1615− /* Create the BLOCK-ENTRY token and append it to the queue. */
1616−
1617− TOKEN_INIT(token, YAML_BLOCK_ENTRY_TOKEN, start_mark, end_mark);
1618−
1619− if (!ENQUEUE(parser, parser->tokens, token))
1620− return 0;
1621−
1622− return 1;
1623−}
1624−
1625−/*
1626− * Produce the KEY token.
1627− */
1628−
1629−static int
1630−yaml_parser_fetch_key(yaml_parser_t *parser)
1631−{
1632− yaml_mark_t start_mark, end_mark;
1633− yaml_token_t token;
1634−
1635− /* In the block context, additional checks are required. */
1636−
1637− if (!parser->flow_level)
1638− {
1639− /* Check if we are allowed to start a new key (not necessary simple). */
1640−
1641− if (!parser->simple_key_allowed) {
1642− return yaml_parser_set_scanner_error(parser, NULL, parser->mark,
1643− "mapping keys are not allowed in this context");
1644− }
1645−
1646− /* Add the BLOCK-MAPPING-START token if needed. */
1647−
1648− if (!yaml_parser_roll_indent(parser, parser->mark.column, -1,
1649− YAML_BLOCK_MAPPING_START_TOKEN, parser->mark))
1650− return 0;
1651− }
1652−
1653− /* Reset any potential simple keys on the current flow level. */
1654−
1655− if (!yaml_parser_remove_simple_key(parser))
1656− return 0;
1657−
1658− /* Simple keys are allowed after '?' in the block context. */
1659−
1660− parser->simple_key_allowed = (!parser->flow_level);
1661−
1662− /* Consume the token. */
1663−
1664− start_mark = parser->mark;
1665− SKIP(parser);
1666− end_mark = parser->mark;
1667−
1668− /* Create the KEY token and append it to the queue. */
1669−
1670− TOKEN_INIT(token, YAML_KEY_TOKEN, start_mark, end_mark);
1671−
1672− if (!ENQUEUE(parser, parser->tokens, token))
1673− return 0;
1674−
1675− return 1;
1676−}
1677−
1678−/*
1679− * Produce the VALUE token.
1680− */
1681−
1682−static int
1683−yaml_parser_fetch_value(yaml_parser_t *parser)
1684−{
1685− yaml_mark_t start_mark, end_mark;
1686− yaml_token_t token;
1687− yaml_simple_key_t *simple_key = parser->simple_keys.top-1;
1688−
1689− /* Have we found a simple key? */
1690−
1691− if (simple_key->possible)
1692− {
1693−
1694− /* Create the KEY token and insert it into the queue. */
1695−
1696− TOKEN_INIT(token, YAML_KEY_TOKEN, simple_key->mark, simple_key->mark);
1697−
1698− if (!QUEUE_INSERT(parser, parser->tokens,
1699− simple_key->token_number - parser->tokens_parsed, token))
1700− return 0;
1701−
1702− /* In the block context, we may need to add the BLOCK-MAPPING-START token. */
1703−
1704− if (!yaml_parser_roll_indent(parser, simple_key->mark.column,
1705− simple_key->token_number,
1706− YAML_BLOCK_MAPPING_START_TOKEN, simple_key->mark))
1707− return 0;
1708−
1709− /* Remove the simple key. */
1710−
1711− simple_key->possible = 0;
1712−
1713− /* A simple key cannot follow another simple key. */
1714−
1715− parser->simple_key_allowed = 0;
1716− }
1717− else
1718− {
1719− /* The ':' indicator follows a complex key. */
1720−
1721− /* In the block context, extra checks are required. */
1722−
1723− if (!parser->flow_level)
1724− {
1725− /* Check if we are allowed to start a complex value. */
1726−
1727− if (!parser->simple_key_allowed) {
1728− return yaml_parser_set_scanner_error(parser, NULL, parser->mark,
1729− "mapping values are not allowed in this context");
1730− }
1731−
1732− /* Add the BLOCK-MAPPING-START token if needed. */
1733−
1734− if (!yaml_parser_roll_indent(parser, parser->mark.column, -1,
1735− YAML_BLOCK_MAPPING_START_TOKEN, parser->mark))
1736− return 0;
1737− }
1738−
1739− /* Simple keys after ':' are allowed in the block context. */
1740−
1741− parser->simple_key_allowed = (!parser->flow_level);
1742− }
1743−
1744− /* Consume the token. */
1745−
1746− start_mark = parser->mark;
1747− SKIP(parser);
1748− end_mark = parser->mark;
1749−
1750− /* Create the VALUE token and append it to the queue. */
1751−
1752− TOKEN_INIT(token, YAML_VALUE_TOKEN, start_mark, end_mark);
1753−
1754− if (!ENQUEUE(parser, parser->tokens, token))
1755− return 0;
1756−
1757− return 1;
1758−}
1759−
1760−/*
1761− * Produce the ALIAS or ANCHOR token.
1762− */
1763−
1764−static int
1765−yaml_parser_fetch_anchor(yaml_parser_t *parser, yaml_token_type_t type)
1766−{
1767− yaml_token_t token;
1768−
1769− /* An anchor or an alias could be a simple key. */
1770−
1771− if (!yaml_parser_save_simple_key(parser))
1772− return 0;
1773−
1774− /* A simple key cannot follow an anchor or an alias. */
1775−
1776− parser->simple_key_allowed = 0;
1777−
1778− /* Create the ALIAS or ANCHOR token and append it to the queue. */
1779−
1780− if (!yaml_parser_scan_anchor(parser, &token, type))
1781− return 0;
1782−
1783− if (!ENQUEUE(parser, parser->tokens, token)) {
1784− yaml_token_delete(&token);
1785− return 0;
1786− }
1787− return 1;
1788−}
1789−
1790−/*
1791− * Produce the TAG token.
1792− */
1793−
1794−static int
1795−yaml_parser_fetch_tag(yaml_parser_t *parser)
1796−{
1797− yaml_token_t token;
1798−
1799− /* A tag could be a simple key. */
1800−
1801− if (!yaml_parser_save_simple_key(parser))
1802− return 0;
1803−
1804− /* A simple key cannot follow a tag. */
1805−
1806− parser->simple_key_allowed = 0;
1807−
1808− /* Create the TAG token and append it to the queue. */
1809−
1810− if (!yaml_parser_scan_tag(parser, &token))
1811− return 0;
1812−
1813− if (!ENQUEUE(parser, parser->tokens, token)) {
1814− yaml_token_delete(&token);
1815− return 0;
1816− }
1817−
1818− return 1;
1819−}
1820−
1821−/*
1822− * Produce the SCALAR(...,literal) or SCALAR(...,folded) tokens.
1823− */
1824−
1825−static int
1826−yaml_parser_fetch_block_scalar(yaml_parser_t *parser, int literal)
1827−{
1828− yaml_token_t token;
1829−
1830− /* Remove any potential simple keys. */
1831−
1832− if (!yaml_parser_remove_simple_key(parser))
1833− return 0;
1834−
1835− /* A simple key may follow a block scalar. */
1836−
1837− parser->simple_key_allowed = 1;
1838−
1839− /* Create the SCALAR token and append it to the queue. */
1840−
1841− if (!yaml_parser_scan_block_scalar(parser, &token, literal))
1842− return 0;
1843−
1844− if (!ENQUEUE(parser, parser->tokens, token)) {
1845− yaml_token_delete(&token);
1846− return 0;
1847− }
1848−
1849− return 1;
1850−}
1851−
1852−/*
1853− * Produce the SCALAR(...,single-quoted) or SCALAR(...,double-quoted) tokens.
1854− */
1855−
1856−static int
1857−yaml_parser_fetch_flow_scalar(yaml_parser_t *parser, int single)
1858−{
1859− yaml_token_t token;
1860−
1861− /* A plain scalar could be a simple key. */
1862−
1863− if (!yaml_parser_save_simple_key(parser))
1864− return 0;
1865−
1866− /* A simple key cannot follow a flow scalar. */
1867−
1868− parser->simple_key_allowed = 0;
1869−
1870− /* Create the SCALAR token and append it to the queue. */
1871−
1872− if (!yaml_parser_scan_flow_scalar(parser, &token, single))
1873− return 0;
1874−
1875− if (!ENQUEUE(parser, parser->tokens, token)) {
1876− yaml_token_delete(&token);
1877− return 0;
1878− }
1879−
1880− return 1;
1881−}
1882−
1883−/*
1884− * Produce the SCALAR(...,plain) token.
1885− */
1886−
1887−static int
1888−yaml_parser_fetch_plain_scalar(yaml_parser_t *parser)
1889−{
1890− yaml_token_t token;
1891−
1892− /* A plain scalar could be a simple key. */
1893−
1894− if (!yaml_parser_save_simple_key(parser))
1895− return 0;
1896−
1897− /* A simple key cannot follow a flow scalar. */
1898−
1899− parser->simple_key_allowed = 0;
1900−
1901− /* Create the SCALAR token and append it to the queue. */
1902−
1903− if (!yaml_parser_scan_plain_scalar(parser, &token))
1904− return 0;
1905−
1906− if (!ENQUEUE(parser, parser->tokens, token)) {
1907− yaml_token_delete(&token);
1908− return 0;
1909− }
1910−
1911− return 1;
1912−}
1913−
1914−/*
1915− * Eat whitespaces and comments until the next token is found.
1916− */
1917−
1918−static int
1919−yaml_parser_scan_to_next_token(yaml_parser_t *parser)
1920−{
1921− /* Until the next token is not found. */
1922−
1923− while (1)
1924− {
1925− /* Allow the BOM mark to start a line. */
1926−
1927− if (!CACHE(parser, 1)) return 0;
1928−
1929− if (parser->mark.column == 0 && IS_BOM(parser->buffer))
1930− SKIP(parser);
1931−
1932− /*
1933− * Eat whitespaces.
1934− *
1935− * Tabs are allowed:
1936− *
1937− * - in the flow context;
1938− * - in the block context, but not at the beginning of the line or
1939− * after '-', '?', or ':' (complex value).
1940− */
1941−
1942− if (!CACHE(parser, 1)) return 0;
1943−
1944− while (CHECK(parser->buffer,' ') ||
1945− ((parser->flow_level || !parser->simple_key_allowed) &&
1946− CHECK(parser->buffer, '\t'))) {
1947− SKIP(parser);
1948− if (!CACHE(parser, 1)) return 0;
1949− }
1950−
1951− /* Eat a comment until a line break. */
1952−
1953− if (CHECK(parser->buffer, '#')) {
1954− while (!IS_BREAKZ(parser->buffer)) {
1955− SKIP(parser);
1956− if (!CACHE(parser, 1)) return 0;
1957− }
1958− }
1959−
1960− /* If it is a line break, eat it. */
1961−
1962− if (IS_BREAK(parser->buffer))
1963− {
1964− if (!CACHE(parser, 2)) return 0;
1965− SKIP_LINE(parser);
1966−
1967− /* In the block context, a new line may start a simple key. */
1968−
1969− if (!parser->flow_level) {
1970− parser->simple_key_allowed = 1;
1971− }
1972− }
1973− else
1974− {
1975− /* We have found a token. */
1976−
1977− break;
1978− }
1979− }
1980−
1981− return 1;
1982−}
1983−
1984−/*
1985− * Scan a YAML-DIRECTIVE or TAG-DIRECTIVE token.
1986− *
1987− * Scope:
1988− * %YAML 1.1 # a comment \n
1989− * ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
1990− * %TAG !yaml! tag:yaml.org,2002: \n
1991− * ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
1992− */
1993−
1994−int
1995−yaml_parser_scan_directive(yaml_parser_t *parser, yaml_token_t *token)
1996−{
1997− yaml_mark_t start_mark, end_mark;
1998− yaml_char_t *name = NULL;
1999− int major, minor;
2000− yaml_char_t *handle = NULL, *prefix = NULL;
2001−
2002− /* Eat '%'. */
2003−
2004− start_mark = parser->mark;
2005−
2006− SKIP(parser);
2007−
2008− /* Scan the directive name. */
2009−
2010− if (!yaml_parser_scan_directive_name(parser, start_mark, &name))
2011− goto error;
2012−
2013− /* Is it a YAML directive? */
2014−
2015− if (strcmp((char *)name, "YAML") == 0)
2016− {
2017− /* Scan the VERSION directive value. */
2018−
2019− if (!yaml_parser_scan_version_directive_value(parser, start_mark,
2020− &major, &minor))
2021− goto error;
2022−
2023− end_mark = parser->mark;
2024−
2025− /* Create a VERSION-DIRECTIVE token. */
2026−
2027− VERSION_DIRECTIVE_TOKEN_INIT(*token, major, minor,
2028− start_mark, end_mark);
2029− }
2030−
2031− /* Is it a TAG directive? */
2032−
2033− else if (strcmp((char *)name, "TAG") == 0)
2034− {
2035− /* Scan the TAG directive value. */
2036−
2037− if (!yaml_parser_scan_tag_directive_value(parser, start_mark,
2038− &handle, &prefix))
2039− goto error;
2040−
2041− end_mark = parser->mark;
2042−
2043− /* Create a TAG-DIRECTIVE token. */
2044−
2045− TAG_DIRECTIVE_TOKEN_INIT(*token, handle, prefix,
2046− start_mark, end_mark);
2047− }
2048−
2049− /* Unknown directive. */
2050−
2051− else
2052− {
2053− yaml_parser_set_scanner_error(parser, "while scanning a directive",
2054− start_mark, "found unknown directive name");
2055− goto error;
2056− }
2057−
2058− /* Eat the rest of the line including any comments. */
2059−
2060− if (!CACHE(parser, 1)) goto error;
2061−
2062− while (IS_BLANK(parser->buffer)) {
2063− SKIP(parser);
2064− if (!CACHE(parser, 1)) goto error;
2065− }
2066−
2067− if (CHECK(parser->buffer, '#')) {
2068− while (!IS_BREAKZ(parser->buffer)) {
2069− SKIP(parser);
2070− if (!CACHE(parser, 1)) goto error;
2071− }
2072− }
2073−
2074− /* Check if we are at the end of the line. */
2075−
2076− if (!IS_BREAKZ(parser->buffer)) {
2077− yaml_parser_set_scanner_error(parser, "while scanning a directive",
2078− start_mark, "did not find expected comment or line break");
2079− goto error;
2080− }
2081−
2082− /* Eat a line break. */
2083−
2084− if (IS_BREAK(parser->buffer)) {
2085− if (!CACHE(parser, 2)) goto error;
2086− SKIP_LINE(parser);
2087− }
2088−
2089− yaml_free(name);
2090−
2091− return 1;
2092−
2093−error:
2094− yaml_free(prefix);
2095− yaml_free(handle);
2096− yaml_free(name);
2097− return 0;
2098−}
2099−
2100−/*
2101− * Scan the directive name.
2102− *
2103− * Scope:
2104− * %YAML 1.1 # a comment \n
2105− * ^^^^
2106− * %TAG !yaml! tag:yaml.org,2002: \n
2107− * ^^^
2108− */
2109−
2110−static int
2111−yaml_parser_scan_directive_name(yaml_parser_t *parser,
2112− yaml_mark_t start_mark, yaml_char_t **name)
2113−{
2114− yaml_string_t string = NULL_STRING;
2115−
2116− if (!STRING_INIT(parser, string, INITIAL_STRING_SIZE)) goto error;
2117−
2118− /* Consume the directive name. */
2119−
2120− if (!CACHE(parser, 1)) goto error;
2121−
2122− while (IS_ALPHA(parser->buffer))
2123− {
2124− if (!READ(parser, string)) goto error;
2125− if (!CACHE(parser, 1)) goto error;
2126− }
2127−
2128− /* Check if the name is empty. */
2129−
2130− if (string.start == string.pointer) {
2131− yaml_parser_set_scanner_error(parser, "while scanning a directive",
2132− start_mark, "could not find expected directive name");
2133− goto error;
2134− }
2135−
2136− /* Check for an blank character after the name. */
2137−
2138− if (!IS_BLANKZ(parser->buffer)) {
2139− yaml_parser_set_scanner_error(parser, "while scanning a directive",
2140− start_mark, "found unexpected non-alphabetical character");
2141− goto error;
2142− }
2143−
2144− *name = string.start;
2145−
2146− return 1;
2147−
2148−error:
2149− STRING_DEL(parser, string);
2150− return 0;
2151−}
2152−
2153−/*
2154− * Scan the value of VERSION-DIRECTIVE.
2155− *
2156− * Scope:
2157− * %YAML 1.1 # a comment \n
2158− * ^^^^^^
2159− */
2160−
2161−static int
2162−yaml_parser_scan_version_directive_value(yaml_parser_t *parser,
2163− yaml_mark_t start_mark, int *major, int *minor)
2164−{
2165− /* Eat whitespaces. */
2166−
2167− if (!CACHE(parser, 1)) return 0;
2168−
2169− while (IS_BLANK(parser->buffer)) {
2170− SKIP(parser);
2171− if (!CACHE(parser, 1)) return 0;
2172− }
2173−
2174− /* Consume the major version number. */
2175−
2176− if (!yaml_parser_scan_version_directive_number(parser, start_mark, major))
2177− return 0;
2178−
2179− /* Eat '.'. */
2180−
2181− if (!CHECK(parser->buffer, '.')) {
2182− return yaml_parser_set_scanner_error(parser, "while scanning a %YAML directive",
2183− start_mark, "did not find expected digit or '.' character");
2184− }
2185−
2186− SKIP(parser);
2187−
2188− /* Consume the minor version number. */
2189−
2190− if (!yaml_parser_scan_version_directive_number(parser, start_mark, minor))
2191− return 0;
2192−
2193− return 1;
2194−}
2195−
2196−#define MAX_NUMBER_LENGTH 9
2197−
2198−/*
2199− * Scan the version number of VERSION-DIRECTIVE.
2200− *
2201− * Scope:
2202− * %YAML 1.1 # a comment \n
2203− * ^
2204− * %YAML 1.1 # a comment \n
2205− * ^
2206− */
2207−
2208−static int
2209−yaml_parser_scan_version_directive_number(yaml_parser_t *parser,
2210− yaml_mark_t start_mark, int *number)
2211−{
2212− int value = 0;
2213− size_t length = 0;
2214−
2215− /* Repeat while the next character is digit. */
2216−
2217− if (!CACHE(parser, 1)) return 0;
2218−
2219− while (IS_DIGIT(parser->buffer))
2220− {
2221− /* Check if the number is too long. */
2222−
2223− if (++length > MAX_NUMBER_LENGTH) {
2224− return yaml_parser_set_scanner_error(parser, "while scanning a %YAML directive",
2225− start_mark, "found extremely long version number");
2226− }
2227−
2228− value = value*10 + AS_DIGIT(parser->buffer);
2229−
2230− SKIP(parser);
2231−
2232− if (!CACHE(parser, 1)) return 0;
2233− }
2234−
2235− /* Check if the number was present. */
2236−
2237− if (!length) {
2238− return yaml_parser_set_scanner_error(parser, "while scanning a %YAML directive",
2239− start_mark, "did not find expected version number");
2240− }
2241−
2242− *number = value;
2243−
2244− return 1;
2245−}
2246−
2247−/*
2248− * Scan the value of a TAG-DIRECTIVE token.
2249− *
2250− * Scope:
2251− * %TAG !yaml! tag:yaml.org,2002: \n
2252− * ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
2253− */
2254−
2255−static int
2256−yaml_parser_scan_tag_directive_value(yaml_parser_t *parser,
2257− yaml_mark_t start_mark, yaml_char_t **handle, yaml_char_t **prefix)
2258−{
2259− yaml_char_t *handle_value = NULL;
2260− yaml_char_t *prefix_value = NULL;
2261−
2262− /* Eat whitespaces. */
2263−
2264− if (!CACHE(parser, 1)) goto error;
2265−
2266− while (IS_BLANK(parser->buffer)) {
2267− SKIP(parser);
2268− if (!CACHE(parser, 1)) goto error;
2269− }
2270−
2271− /* Scan a handle. */
2272−
2273− if (!yaml_parser_scan_tag_handle(parser, 1, start_mark, &handle_value))
2274− goto error;
2275−
2276− /* Expect a whitespace. */
2277−
2278− if (!CACHE(parser, 1)) goto error;
2279−
2280− if (!IS_BLANK(parser->buffer)) {
2281− yaml_parser_set_scanner_error(parser, "while scanning a %TAG directive",
2282− start_mark, "did not find expected whitespace");
2283− goto error;
2284− }
2285−
2286− /* Eat whitespaces. */
2287−
2288− while (IS_BLANK(parser->buffer)) {
2289− SKIP(parser);
2290− if (!CACHE(parser, 1)) goto error;
2291− }
2292−
2293− /* Scan a prefix. */
2294−
2295− if (!yaml_parser_scan_tag_uri(parser, 1, NULL, start_mark, &prefix_value))
2296− goto error;
2297−
2298− /* Expect a whitespace or line break. */
2299−
2300− if (!CACHE(parser, 1)) goto error;
2301−
2302− if (!IS_BLANKZ(parser->buffer)) {
2303− yaml_parser_set_scanner_error(parser, "while scanning a %TAG directive",
2304− start_mark, "did not find expected whitespace or line break");
2305− goto error;
2306− }
2307−
2308− *handle = handle_value;
2309− *prefix = prefix_value;
2310−
2311− return 1;
2312−
2313−error:
2314− yaml_free(handle_value);
2315− yaml_free(prefix_value);
2316− return 0;
2317−}
2318−
2319−static int
2320−yaml_parser_scan_anchor(yaml_parser_t *parser, yaml_token_t *token,
2321− yaml_token_type_t type)
2322−{
2323− int length = 0;
2324− yaml_mark_t start_mark, end_mark;
2325− yaml_string_t string = NULL_STRING;
2326−
2327− if (!STRING_INIT(parser, string, INITIAL_STRING_SIZE)) goto error;
2328−
2329− /* Eat the indicator character. */
2330−
2331− start_mark = parser->mark;
2332−
2333− SKIP(parser);
2334−
2335− /* Consume the value. */
2336−
2337− if (!CACHE(parser, 1)) goto error;
2338−
2339− while (IS_ALPHA(parser->buffer)) {
2340− if (!READ(parser, string)) goto error;
2341− if (!CACHE(parser, 1)) goto error;
2342− length ++;
2343− }
2344−
2345− end_mark = parser->mark;
2346−
2347− /*
2348− * Check if length of the anchor is greater than 0 and it is followed by
2349− * a whitespace character or one of the indicators:
2350− *
2351− * '?', ':', ',', ']', '}', '%', '@', '`'.
2352− */
2353−
2354− if (!length || !(IS_BLANKZ(parser->buffer) || CHECK(parser->buffer, '?')
2355− || CHECK(parser->buffer, ':') || CHECK(parser->buffer, ',')
2356− || CHECK(parser->buffer, ']') || CHECK(parser->buffer, '}')
2357− || CHECK(parser->buffer, '%') || CHECK(parser->buffer, '@')
2358− || CHECK(parser->buffer, '`'))) {
2359− yaml_parser_set_scanner_error(parser, type == YAML_ANCHOR_TOKEN ?
2360− "while scanning an anchor" : "while scanning an alias", start_mark,
2361− "did not find expected alphabetic or numeric character");
2362− goto error;
2363− }
2364−
2365− /* Create a token. */
2366−
2367− if (type == YAML_ANCHOR_TOKEN) {
2368− ANCHOR_TOKEN_INIT(*token, string.start, start_mark, end_mark);
2369− }
2370− else {
2371− ALIAS_TOKEN_INIT(*token, string.start, start_mark, end_mark);
2372− }
2373−
2374− return 1;
2375−
2376−error:
2377− STRING_DEL(parser, string);
2378− return 0;
2379−}
2380−
2381−/*
2382− * Scan a TAG token.
2383− */
2384−
2385−static int
2386−yaml_parser_scan_tag(yaml_parser_t *parser, yaml_token_t *token)
2387−{
2388− yaml_char_t *handle = NULL;
2389− yaml_char_t *suffix = NULL;
2390− yaml_mark_t start_mark, end_mark;
2391−
2392− start_mark = parser->mark;
2393−
2394− /* Check if the tag is in the canonical form. */
2395−
2396− if (!CACHE(parser, 2)) goto error;
2397−
2398− if (CHECK_AT(parser->buffer, '<', 1))
2399− {
2400− /* Set the handle to '' */
2401−
2402− handle = YAML_MALLOC(1);
2403− if (!handle) goto error;
2404− handle[0] = '\0';
2405−
2406− /* Eat '!<' */
2407−
2408− SKIP(parser);
2409− SKIP(parser);
2410−
2411− /* Consume the tag value. */
2412−
2413− if (!yaml_parser_scan_tag_uri(parser, 0, NULL, start_mark, &suffix))
2414− goto error;
2415−
2416− /* Check for '>' and eat it. */
2417−
2418− if (!CHECK(parser->buffer, '>')) {
2419− yaml_parser_set_scanner_error(parser, "while scanning a tag",
2420− start_mark, "did not find the expected '>'");
2421− goto error;
2422− }
2423−
2424− SKIP(parser);
2425− }
2426− else
2427− {
2428− /* The tag has either the '!suffix' or the '!handle!suffix' form. */
2429−
2430− /* First, try to scan a handle. */
2431−
2432− if (!yaml_parser_scan_tag_handle(parser, 0, start_mark, &handle))
2433− goto error;
2434−
2435− /* Check if it is, indeed, handle. */
2436−
2437− if (handle[0] == '!' && handle[1] != '\0' && handle[strlen((char *)handle)-1] == '!')
2438− {
2439− /* Scan the suffix now. */
2440−
2441− if (!yaml_parser_scan_tag_uri(parser, 0, NULL, start_mark, &suffix))
2442− goto error;
2443− }
2444− else
2445− {
2446− /* It wasn't a handle after all. Scan the rest of the tag. */
2447−
2448− if (!yaml_parser_scan_tag_uri(parser, 0, handle, start_mark, &suffix))
2449− goto error;
2450−
2451− /* Set the handle to '!'. */
2452−
2453− yaml_free(handle);
2454− handle = YAML_MALLOC(2);
2455− if (!handle) goto error;
2456− handle[0] = '!';
2457− handle[1] = '\0';
2458−
2459− /*
2460− * A special case: the '!' tag. Set the handle to '' and the
2461− * suffix to '!'.
2462− */
2463−
2464− if (suffix[0] == '\0') {
2465− yaml_char_t *tmp = handle;
2466− handle = suffix;
2467− suffix = tmp;
2468− }
2469− }
2470− }
2471−
2472− /* Check the character which ends the tag. */
2473−
2474− if (!CACHE(parser, 1)) goto error;
2475−
2476− if (!IS_BLANKZ(parser->buffer)) {
2477− yaml_parser_set_scanner_error(parser, "while scanning a tag",
2478− start_mark, "did not find expected whitespace or line break");
2479− goto error;
2480− }
2481−
2482− end_mark = parser->mark;
2483−
2484− /* Create a token. */
2485−
2486− TAG_TOKEN_INIT(*token, handle, suffix, start_mark, end_mark);
2487−
2488− return 1;
2489−
2490−error:
2491− yaml_free(handle);
2492− yaml_free(suffix);
2493− return 0;
2494−}
2495−
2496−/*
2497− * Scan a tag handle.
2498− */
2499−
2500−static int
2501−yaml_parser_scan_tag_handle(yaml_parser_t *parser, int directive,
2502− yaml_mark_t start_mark, yaml_char_t **handle)
2503−{
2504− yaml_string_t string = NULL_STRING;
2505−
2506− if (!STRING_INIT(parser, string, INITIAL_STRING_SIZE)) goto error;
2507−
2508− /* Check the initial '!' character. */
2509−
2510− if (!CACHE(parser, 1)) goto error;
2511−
2512− if (!CHECK(parser->buffer, '!')) {
2513− yaml_parser_set_scanner_error(parser, directive ?
2514− "while scanning a tag directive" : "while scanning a tag",
2515− start_mark, "did not find expected '!'");
2516− goto error;
2517− }
2518−
2519− /* Copy the '!' character. */
2520−
2521− if (!READ(parser, string)) goto error;
2522−
2523− /* Copy all subsequent alphabetical and numerical characters. */
2524−
2525− if (!CACHE(parser, 1)) goto error;
2526−
2527− while (IS_ALPHA(parser->buffer))
2528− {
2529− if (!READ(parser, string)) goto error;
2530− if (!CACHE(parser, 1)) goto error;
2531− }
2532−
2533− /* Check if the trailing character is '!' and copy it. */
2534−
2535− if (CHECK(parser->buffer, '!'))
2536− {
2537− if (!READ(parser, string)) goto error;
2538− }
2539− else
2540− {
2541− /*
2542− * It's either the '!' tag or not really a tag handle. If it's a %TAG
2543− * directive, it's an error. If it's a tag token, it must be a part of
2544− * URI.
2545− */
2546−
2547− if (directive && !(string.start[0] == '!' && string.start[1] == '\0')) {
2548− yaml_parser_set_scanner_error(parser, "while parsing a tag directive",
2549− start_mark, "did not find expected '!'");
2550− goto error;
2551− }
2552− }
2553−
2554− *handle = string.start;
2555−
2556− return 1;
2557−
2558−error:
2559− STRING_DEL(parser, string);
2560− return 0;
2561−}
2562−
2563−/*
2564− * Scan a tag.
2565− */
2566−
2567−static int
2568−yaml_parser_scan_tag_uri(yaml_parser_t *parser, int directive,
2569− yaml_char_t *head, yaml_mark_t start_mark, yaml_char_t **uri)
2570−{
2571− size_t length = head ? strlen((char *)head) : 0;
2572− yaml_string_t string = NULL_STRING;
2573−
2574− if (!STRING_INIT(parser, string, INITIAL_STRING_SIZE)) goto error;
2575−
2576− /* Resize the string to include the head. */
2577−
2578− while ((size_t)(string.end - string.start) <= length) {
2579− if (!yaml_string_extend(&string.start, &string.pointer, &string.end)) {
2580− parser->error = YAML_MEMORY_ERROR;
2581− goto error;
2582− }
2583− }
2584−
2585− /*
2586− * Copy the head if needed.
2587− *
2588− * Note that we don't copy the leading '!' character.
2589− */
2590−
2591− if (length > 1) {
2592− memcpy(string.start, head+1, length-1);
2593− string.pointer += length-1;
2594− }
2595−
2596− /* Scan the tag. */
2597−
2598− if (!CACHE(parser, 1)) goto error;
2599−
2600− /*
2601− * The set of characters that may appear in URI is as follows:
2602− *
2603− * '0'-'9', 'A'-'Z', 'a'-'z', '_', '-', ';', '/', '?', ':', '@', '&',
2604− * '=', '+', '$', ',', '.', '!', '~', '*', '\'', '(', ')', '[', ']',
2605− * '%'.
2606− */
2607−
2608− while (IS_ALPHA(parser->buffer) || CHECK(parser->buffer, ';')
2609− || CHECK(parser->buffer, '/') || CHECK(parser->buffer, '?')
2610− || CHECK(parser->buffer, ':') || CHECK(parser->buffer, '@')
2611− || CHECK(parser->buffer, '&') || CHECK(parser->buffer, '=')
2612− || CHECK(parser->buffer, '+') || CHECK(parser->buffer, '$')
2613− || CHECK(parser->buffer, ',') || CHECK(parser->buffer, '.')
2614− || CHECK(parser->buffer, '!') || CHECK(parser->buffer, '~')
2615− || CHECK(parser->buffer, '*') || CHECK(parser->buffer, '\'')
2616− || CHECK(parser->buffer, '(') || CHECK(parser->buffer, ')')
2617− || CHECK(parser->buffer, '[') || CHECK(parser->buffer, ']')
2618− || CHECK(parser->buffer, '%'))
2619− {
2620− /* Check if it is a URI-escape sequence. */
2621−
2622− if (CHECK(parser->buffer, '%')) {
2623− if (!STRING_EXTEND(parser, string))
2624− goto error;
2625−
2626− if (!yaml_parser_scan_uri_escapes(parser,
2627− directive, start_mark, &string)) goto error;
2628− }
2629− else {
2630− if (!READ(parser, string)) goto error;
2631− }
2632−
2633− length ++;
2634− if (!CACHE(parser, 1)) goto error;
2635− }
2636−
2637− /* Check if the tag is non-empty. */
2638−
2639− if (!length) {
2640− if (!STRING_EXTEND(parser, string))
2641− goto error;
2642−
2643− yaml_parser_set_scanner_error(parser, directive ?
2644− "while parsing a %TAG directive" : "while parsing a tag",
2645− start_mark, "did not find expected tag URI");
2646− goto error;
2647− }
2648−
2649− *uri = string.start;
2650−
2651− return 1;
2652−
2653−error:
2654− STRING_DEL(parser, string);
2655− return 0;
2656−}
2657−
2658−/*
2659− * Decode an URI-escape sequence corresponding to a single UTF-8 character.
2660− */
2661−
2662−static int
2663−yaml_parser_scan_uri_escapes(yaml_parser_t *parser, int directive,
2664− yaml_mark_t start_mark, yaml_string_t *string)
2665−{
2666− int width = 0;
2667−
2668− /* Decode the required number of characters. */
2669−
2670− do {
2671−
2672− unsigned char octet = 0;
2673−
2674− /* Check for a URI-escaped octet. */
2675−
2676− if (!CACHE(parser, 3)) return 0;
2677−
2678− if (!(CHECK(parser->buffer, '%')
2679− && IS_HEX_AT(parser->buffer, 1)
2680− && IS_HEX_AT(parser->buffer, 2))) {
2681− return yaml_parser_set_scanner_error(parser, directive ?
2682− "while parsing a %TAG directive" : "while parsing a tag",
2683− start_mark, "did not find URI escaped octet");
2684− }
2685−
2686− /* Get the octet. */
2687−
2688− octet = (AS_HEX_AT(parser->buffer, 1) << 4) + AS_HEX_AT(parser->buffer, 2);
2689−
2690− /* If it is the leading octet, determine the length of the UTF-8 sequence. */
2691−
2692− if (!width)
2693− {
2694− width = (octet & 0x80) == 0x00 ? 1 :
2695− (octet & 0xE0) == 0xC0 ? 2 :
2696− (octet & 0xF0) == 0xE0 ? 3 :
2697− (octet & 0xF8) == 0xF0 ? 4 : 0;
2698− if (!width) {
2699− return yaml_parser_set_scanner_error(parser, directive ?
2700− "while parsing a %TAG directive" : "while parsing a tag",
2701− start_mark, "found an incorrect leading UTF-8 octet");
2702− }
2703− }
2704− else
2705− {
2706− /* Check if the trailing octet is correct. */
2707−
2708− if ((octet & 0xC0) != 0x80) {
2709− return yaml_parser_set_scanner_error(parser, directive ?
2710− "while parsing a %TAG directive" : "while parsing a tag",
2711− start_mark, "found an incorrect trailing UTF-8 octet");
2712− }
2713− }
2714−
2715− /* Copy the octet and move the pointers. */
2716−
2717− *(string->pointer++) = octet;
2718− SKIP(parser);
2719− SKIP(parser);
2720− SKIP(parser);
2721−
2722− } while (--width);
2723−
2724− return 1;
2725−}
2726−
2727−/*
2728− * Scan a block scalar.
2729− */
2730−
2731−static int
2732−yaml_parser_scan_block_scalar(yaml_parser_t *parser, yaml_token_t *token,
2733− int literal)
2734−{
2735− yaml_mark_t start_mark;
2736− yaml_mark_t end_mark;
2737− yaml_string_t string = NULL_STRING;
2738− yaml_string_t leading_break = NULL_STRING;
2739− yaml_string_t trailing_breaks = NULL_STRING;
2740− int chomping = 0;
2741− int increment = 0;
2742− int indent = 0;
2743− int leading_blank = 0;
2744− int trailing_blank = 0;
2745−
2746− if (!STRING_INIT(parser, string, INITIAL_STRING_SIZE)) goto error;
2747− if (!STRING_INIT(parser, leading_break, INITIAL_STRING_SIZE)) goto error;
2748− if (!STRING_INIT(parser, trailing_breaks, INITIAL_STRING_SIZE)) goto error;
2749−
2750− /* Eat the indicator '|' or '>'. */
2751−
2752− start_mark = parser->mark;
2753−
2754− SKIP(parser);
2755−
2756− /* Scan the additional block scalar indicators. */
2757−
2758− if (!CACHE(parser, 1)) goto error;
2759−
2760− /* Check for a chomping indicator. */
2761−
2762− if (CHECK(parser->buffer, '+') || CHECK(parser->buffer, '-'))
2763− {
2764− /* Set the chomping method and eat the indicator. */
2765−
2766− chomping = CHECK(parser->buffer, '+') ? +1 : -1;
2767−
2768− SKIP(parser);
2769−
2770− /* Check for an indentation indicator. */
2771−
2772− if (!CACHE(parser, 1)) goto error;
2773−
2774− if (IS_DIGIT(parser->buffer))
2775− {
2776− /* Check that the indentation is greater than 0. */
2777−
2778− if (CHECK(parser->buffer, '0')) {
2779− yaml_parser_set_scanner_error(parser, "while scanning a block scalar",
2780− start_mark, "found an indentation indicator equal to 0");
2781− goto error;
2782− }
2783−
2784− /* Get the indentation level and eat the indicator. */
2785−
2786− increment = AS_DIGIT(parser->buffer);
2787−
2788− SKIP(parser);
2789− }
2790− }
2791−
2792− /* Do the same as above, but in the opposite order. */
2793−
2794− else if (IS_DIGIT(parser->buffer))
2795− {
2796− if (CHECK(parser->buffer, '0')) {
2797− yaml_parser_set_scanner_error(parser, "while scanning a block scalar",
2798− start_mark, "found an indentation indicator equal to 0");
2799− goto error;
2800− }
2801−
2802− increment = AS_DIGIT(parser->buffer);
2803−
2804− SKIP(parser);
2805−
2806− if (!CACHE(parser, 1)) goto error;
2807−
2808− if (CHECK(parser->buffer, '+') || CHECK(parser->buffer, '-')) {
2809− chomping = CHECK(parser->buffer, '+') ? +1 : -1;
2810−
2811− SKIP(parser);
2812− }
2813− }
2814−
2815− /* Eat whitespaces and comments to the end of the line. */
2816−
2817− if (!CACHE(parser, 1)) goto error;
2818−
2819− while (IS_BLANK(parser->buffer)) {
2820− SKIP(parser);
2821− if (!CACHE(parser, 1)) goto error;
2822− }
2823−
2824− if (CHECK(parser->buffer, '#')) {
2825− while (!IS_BREAKZ(parser->buffer)) {
2826− SKIP(parser);
2827− if (!CACHE(parser, 1)) goto error;
2828− }
2829− }
2830−
2831− /* Check if we are at the end of the line. */
2832−
2833− if (!IS_BREAKZ(parser->buffer)) {
2834− yaml_parser_set_scanner_error(parser, "while scanning a block scalar",
2835− start_mark, "did not find expected comment or line break");
2836− goto error;
2837− }
2838−
2839− /* Eat a line break. */
2840−
2841− if (IS_BREAK(parser->buffer)) {
2842− if (!CACHE(parser, 2)) goto error;
2843− SKIP_LINE(parser);
2844− }
2845−
2846− end_mark = parser->mark;
2847−
2848− /* Set the indentation level if it was specified. */
2849−
2850− if (increment) {
2851− indent = parser->indent >= 0 ? parser->indent+increment : increment;
2852− }
2853−
2854− /* Scan the leading line breaks and determine the indentation level if needed. */
2855−
2856− if (!yaml_parser_scan_block_scalar_breaks(parser, &indent, &trailing_breaks,
2857− start_mark, &end_mark)) goto error;
2858−
2859− /* Scan the block scalar content. */
2860−
2861− if (!CACHE(parser, 1)) goto error;
2862−
2863− while ((int)parser->mark.column == indent && !(IS_Z(parser->buffer)))
2864− {
2865− /*
2866− * We are at the beginning of a non-empty line.
2867− */
2868−
2869− /* Is it a trailing whitespace? */
2870−
2871− trailing_blank = IS_BLANK(parser->buffer);
2872−
2873− /* Check if we need to fold the leading line break. */
2874−
2875− if (!literal && (*leading_break.start == '\n')
2876− && !leading_blank && !trailing_blank)
2877− {
2878− /* Do we need to join the lines by space? */
2879−
2880− if (*trailing_breaks.start == '\0') {
2881− if (!STRING_EXTEND(parser, string)) goto error;
2882− *(string.pointer ++) = ' ';
2883− }
2884−
2885− CLEAR(parser, leading_break);
2886− }
2887− else {
2888− if (!JOIN(parser, string, leading_break)) goto error;
2889− CLEAR(parser, leading_break);
2890− }
2891−
2892− /* Append the remaining line breaks. */
2893−
2894− if (!JOIN(parser, string, trailing_breaks)) goto error;
2895− CLEAR(parser, trailing_breaks);
2896−
2897− /* Is it a leading whitespace? */
2898−
2899− leading_blank = IS_BLANK(parser->buffer);
2900−
2901− /* Consume the current line. */
2902−
2903− while (!IS_BREAKZ(parser->buffer)) {
2904− if (!READ(parser, string)) goto error;
2905− if (!CACHE(parser, 1)) goto error;
2906− }
2907−
2908− /* Consume the line break. */
2909−
2910− if (!CACHE(parser, 2)) goto error;
2911−
2912− if (!READ_LINE(parser, leading_break)) goto error;
2913−
2914− /* Eat the following indentation spaces and line breaks. */
2915−
2916− if (!yaml_parser_scan_block_scalar_breaks(parser,
2917− &indent, &trailing_breaks, start_mark, &end_mark)) goto error;
2918− }
2919−
2920− /* Chomp the tail. */
2921−
2922− if (chomping != -1) {
2923− if (!JOIN(parser, string, leading_break)) goto error;
2924− }
2925− if (chomping == 1) {
2926− if (!JOIN(parser, string, trailing_breaks)) goto error;
2927− }
2928−
2929− /* Create a token. */
2930−
2931− SCALAR_TOKEN_INIT(*token, string.start, string.pointer-string.start,
2932− literal ? YAML_LITERAL_SCALAR_STYLE : YAML_FOLDED_SCALAR_STYLE,
2933− start_mark, end_mark);
2934−
2935− STRING_DEL(parser, leading_break);
2936− STRING_DEL(parser, trailing_breaks);
2937−
2938− return 1;
2939−
2940−error:
2941− STRING_DEL(parser, string);
2942− STRING_DEL(parser, leading_break);
2943− STRING_DEL(parser, trailing_breaks);
2944−
2945− return 0;
2946−}
2947−
2948−/*
2949− * Scan indentation spaces and line breaks for a block scalar. Determine the
2950− * indentation level if needed.
2951− */
2952−
2953−static int
2954−yaml_parser_scan_block_scalar_breaks(yaml_parser_t *parser,
2955− int *indent, yaml_string_t *breaks,
2956− yaml_mark_t start_mark, yaml_mark_t *end_mark)
2957−{
2958− int max_indent = 0;
2959−
2960− *end_mark = parser->mark;
2961−
2962− /* Eat the indentation spaces and line breaks. */
2963−
2964− while (1)
2965− {
2966− /* Eat the indentation spaces. */
2967−
2968− if (!CACHE(parser, 1)) return 0;
2969−
2970− while ((!*indent || (int)parser->mark.column < *indent)
2971− && IS_SPACE(parser->buffer)) {
2972− SKIP(parser);
2973− if (!CACHE(parser, 1)) return 0;
2974− }
2975−
2976− if ((int)parser->mark.column > max_indent)
2977− max_indent = (int)parser->mark.column;
2978−
2979− /* Check for a tab character messing the indentation. */
2980−
2981− if ((!*indent || (int)parser->mark.column < *indent)
2982− && IS_TAB(parser->buffer)) {
2983− return yaml_parser_set_scanner_error(parser, "while scanning a block scalar",
2984− start_mark, "found a tab character where an indentation space is expected");
2985− }
2986−
2987− /* Have we found a non-empty line? */
2988−
2989− if (!IS_BREAK(parser->buffer)) break;
2990−
2991− /* Consume the line break. */
2992−
2993− if (!CACHE(parser, 2)) return 0;
2994− if (!READ_LINE(parser, *breaks)) return 0;
2995− *end_mark = parser->mark;
2996− }
2997−
2998− /* Determine the indentation level if needed. */
2999−
3000− if (!*indent) {
3001− *indent = max_indent;
3002− if (*indent < parser->indent + 1)
3003− *indent = parser->indent + 1;
3004− if (*indent < 1)
3005− *indent = 1;
3006− }
3007−
3008− return 1;
3009−}
3010−
3011−/*
3012− * Scan a quoted scalar.
3013− */
3014−
3015−static int
3016−yaml_parser_scan_flow_scalar(yaml_parser_t *parser, yaml_token_t *token,
3017− int single)
3018−{
3019− yaml_mark_t start_mark;
3020− yaml_mark_t end_mark;
3021− yaml_string_t string = NULL_STRING;
3022− yaml_string_t leading_break = NULL_STRING;
3023− yaml_string_t trailing_breaks = NULL_STRING;
3024− yaml_string_t whitespaces = NULL_STRING;
3025− int leading_blanks;
3026−
3027− if (!STRING_INIT(parser, string, INITIAL_STRING_SIZE)) goto error;
3028− if (!STRING_INIT(parser, leading_break, INITIAL_STRING_SIZE)) goto error;
3029− if (!STRING_INIT(parser, trailing_breaks, INITIAL_STRING_SIZE)) goto error;
3030− if (!STRING_INIT(parser, whitespaces, INITIAL_STRING_SIZE)) goto error;
3031−
3032− /* Eat the left quote. */
3033−
3034− start_mark = parser->mark;
3035−
3036− SKIP(parser);
3037−
3038− /* Consume the content of the quoted scalar. */
3039−
3040− while (1)
3041− {
3042− /* Check that there are no document indicators at the beginning of the line. */
3043−
3044− if (!CACHE(parser, 4)) goto error;
3045−
3046− if (parser->mark.column == 0 &&
3047− ((CHECK_AT(parser->buffer, '-', 0) &&
3048− CHECK_AT(parser->buffer, '-', 1) &&
3049− CHECK_AT(parser->buffer, '-', 2)) ||
3050− (CHECK_AT(parser->buffer, '.', 0) &&
3051− CHECK_AT(parser->buffer, '.', 1) &&
3052− CHECK_AT(parser->buffer, '.', 2))) &&
3053− IS_BLANKZ_AT(parser->buffer, 3))
3054− {
3055− yaml_parser_set_scanner_error(parser, "while scanning a quoted scalar",
3056− start_mark, "found unexpected document indicator");
3057− goto error;
3058− }
3059−
3060− /* Check for EOF. */
3061−
3062− if (IS_Z(parser->buffer)) {
3063− yaml_parser_set_scanner_error(parser, "while scanning a quoted scalar",
3064− start_mark, "found unexpected end of stream");
3065− goto error;
3066− }
3067−
3068− /* Consume non-blank characters. */
3069−
3070− if (!CACHE(parser, 2)) goto error;
3071−
3072− leading_blanks = 0;
3073−
3074− while (!IS_BLANKZ(parser->buffer))
3075− {
3076− /* Check for an escaped single quote. */
3077−
3078− if (single && CHECK_AT(parser->buffer, '\'', 0)
3079− && CHECK_AT(parser->buffer, '\'', 1))
3080− {
3081− if (!STRING_EXTEND(parser, string)) goto error;
3082− *(string.pointer++) = '\'';
3083− SKIP(parser);
3084− SKIP(parser);
3085− }
3086−
3087− /* Check for the right quote. */
3088−
3089− else if (CHECK(parser->buffer, single ? '\'' : '"'))
3090− {
3091− break;
3092− }
3093−
3094− /* Check for an escaped line break. */
3095−
3096− else if (!single && CHECK(parser->buffer, '\\')
3097− && IS_BREAK_AT(parser->buffer, 1))
3098− {
3099− if (!CACHE(parser, 3)) goto error;
3100− SKIP(parser);
3101− SKIP_LINE(parser);
3102− leading_blanks = 1;
3103− break;
3104− }
3105−
3106− /* Check for an escape sequence. */
3107−
3108− else if (!single && CHECK(parser->buffer, '\\'))
3109− {
3110− size_t code_length = 0;
3111−
3112− if (!STRING_EXTEND(parser, string)) goto error;
3113−
3114− /* Check the escape character. */
3115−
3116− switch (parser->buffer.pointer[1])
3117− {
3118− case '0':
3119− *(string.pointer++) = '\0';
3120− break;
3121−
3122− case 'a':
3123− *(string.pointer++) = '\x07';
3124− break;
3125−
3126− case 'b':
3127− *(string.pointer++) = '\x08';
3128− break;
3129−
3130− case 't':
3131− case '\t':
3132− *(string.pointer++) = '\x09';
3133− break;
3134−
3135− case 'n':
3136− *(string.pointer++) = '\x0A';
3137− break;
3138−
3139− case 'v':
3140− *(string.pointer++) = '\x0B';
3141− break;
3142−
3143− case 'f':
3144− *(string.pointer++) = '\x0C';
3145− break;
3146−
3147− case 'r':
3148− *(string.pointer++) = '\x0D';
3149− break;
3150−
3151− case 'e':
3152− *(string.pointer++) = '\x1B';
3153− break;
3154−
3155− case ' ':
3156− *(string.pointer++) = '\x20';
3157− break;
3158−
3159− case '"':
3160− *(string.pointer++) = '"';
3161− break;
3162−
3163− case '/':
3164− *(string.pointer++) = '/';
3165− break;
3166−
3167− case '\\':
3168− *(string.pointer++) = '\\';
3169− break;
3170−
3171− case 'N': /* NEL (#x85) */
3172− *(string.pointer++) = '\xC2';
3173− *(string.pointer++) = '\x85';
3174− break;
3175−
3176− case '_': /* #xA0 */
3177− *(string.pointer++) = '\xC2';
3178− *(string.pointer++) = '\xA0';
3179− break;
3180−
3181− case 'L': /* LS (#x2028) */
3182− *(string.pointer++) = '\xE2';
3183− *(string.pointer++) = '\x80';
3184− *(string.pointer++) = '\xA8';
3185− break;
3186−
3187− case 'P': /* PS (#x2029) */
3188− *(string.pointer++) = '\xE2';
3189− *(string.pointer++) = '\x80';
3190− *(string.pointer++) = '\xA9';
3191− break;
3192−
3193− case 'x':
3194− code_length = 2;
3195− break;
3196−
3197− case 'u':
3198− code_length = 4;
3199− break;
3200−
3201− case 'U':
3202− code_length = 8;
3203− break;
3204−
3205− default:
3206− yaml_parser_set_scanner_error(parser, "while parsing a quoted scalar",
3207− start_mark, "found unknown escape character");
3208− goto error;
3209− }
3210−
3211− SKIP(parser);
3212− SKIP(parser);
3213−
3214− /* Consume an arbitrary escape code. */
3215−
3216− if (code_length)
3217− {
3218− unsigned int value = 0;
3219− size_t k;
3220−
3221− /* Scan the character value. */
3222−
3223− if (!CACHE(parser, code_length)) goto error;
3224−
3225− for (k = 0; k < code_length; k ++) {
3226− if (!IS_HEX_AT(parser->buffer, k)) {
3227− yaml_parser_set_scanner_error(parser, "while parsing a quoted scalar",
3228− start_mark, "did not find expected hexdecimal number");
3229− goto error;
3230− }
3231− value = (value << 4) + AS_HEX_AT(parser->buffer, k);
3232− }
3233−
3234− /* Check the value and write the character. */
3235−
3236− if ((value >= 0xD800 && value <= 0xDFFF) || value > 0x10FFFF) {
3237− yaml_parser_set_scanner_error(parser, "while parsing a quoted scalar",
3238− start_mark, "found invalid Unicode character escape code");
3239− goto error;
3240− }
3241−
3242− if (value <= 0x7F) {
3243− *(string.pointer++) = value;
3244− }
3245− else if (value <= 0x7FF) {
3246− *(string.pointer++) = 0xC0 + (value >> 6);
3247− *(string.pointer++) = 0x80 + (value & 0x3F);
3248− }
3249− else if (value <= 0xFFFF) {
3250− *(string.pointer++) = 0xE0 + (value >> 12);
3251− *(string.pointer++) = 0x80 + ((value >> 6) & 0x3F);
3252− *(string.pointer++) = 0x80 + (value & 0x3F);
3253− }
3254− else {
3255− *(string.pointer++) = 0xF0 + (value >> 18);
3256− *(string.pointer++) = 0x80 + ((value >> 12) & 0x3F);
3257− *(string.pointer++) = 0x80 + ((value >> 6) & 0x3F);
3258− *(string.pointer++) = 0x80 + (value & 0x3F);
3259− }
3260−
3261− /* Advance the pointer. */
3262−
3263− for (k = 0; k < code_length; k ++) {
3264− SKIP(parser);
3265− }
3266− }
3267− }
3268−
3269− else
3270− {
3271− /* It is a non-escaped non-blank character. */
3272−
3273− if (!READ(parser, string)) goto error;
3274− }
3275−
3276− if (!CACHE(parser, 2)) goto error;
3277− }
3278−
3279− /* Check if we are at the end of the scalar. */
3280−
3281− /* Fix for crash unitialized value crash
3282− * Credit for the bug and input is to OSS Fuzz
3283− * Credit for the fix to Alex Gaynor
3284− */
3285− if (!CACHE(parser, 1)) goto error;
3286− if (CHECK(parser->buffer, single ? '\'' : '"'))
3287− break;
3288−
3289− /* Consume blank characters. */
3290−
3291− if (!CACHE(parser, 1)) goto error;
3292−
3293− while (IS_BLANK(parser->buffer) || IS_BREAK(parser->buffer))
3294− {
3295− if (IS_BLANK(parser->buffer))
3296− {
3297− /* Consume a space or a tab character. */
3298−
3299− if (!leading_blanks) {
3300− if (!READ(parser, whitespaces)) goto error;
3301− }
3302− else {
3303− SKIP(parser);
3304− }
3305− }
3306− else
3307− {
3308− if (!CACHE(parser, 2)) goto error;
3309−
3310− /* Check if it is a first line break. */
3311−
3312− if (!leading_blanks)
3313− {
3314− CLEAR(parser, whitespaces);
3315− if (!READ_LINE(parser, leading_break)) goto error;
3316− leading_blanks = 1;
3317− }
3318− else
3319− {
3320− if (!READ_LINE(parser, trailing_breaks)) goto error;
3321− }
3322− }
3323− if (!CACHE(parser, 1)) goto error;
3324− }
3325−
3326− /* Join the whitespaces or fold line breaks. */
3327−
3328− if (leading_blanks)
3329− {
3330− /* Do we need to fold line breaks? */
3331−
3332− if (leading_break.start[0] == '\n') {
3333− if (trailing_breaks.start[0] == '\0') {
3334− if (!STRING_EXTEND(parser, string)) goto error;
3335− *(string.pointer++) = ' ';
3336− }
3337− else {
3338− if (!JOIN(parser, string, trailing_breaks)) goto error;
3339− CLEAR(parser, trailing_breaks);
3340− }
3341− CLEAR(parser, leading_break);
3342− }
3343− else {
3344− if (!JOIN(parser, string, leading_break)) goto error;
3345− if (!JOIN(parser, string, trailing_breaks)) goto error;
3346− CLEAR(parser, leading_break);
3347− CLEAR(parser, trailing_breaks);
3348− }
3349− }
3350− else
3351− {
3352− if (!JOIN(parser, string, whitespaces)) goto error;
3353− CLEAR(parser, whitespaces);
3354− }
3355− }
3356−
3357− /* Eat the right quote. */
3358−
3359− SKIP(parser);
3360−
3361− end_mark = parser->mark;
3362−
3363− /* Create a token. */
3364−
3365− SCALAR_TOKEN_INIT(*token, string.start, string.pointer-string.start,
3366− single ? YAML_SINGLE_QUOTED_SCALAR_STYLE : YAML_DOUBLE_QUOTED_SCALAR_STYLE,
3367− start_mark, end_mark);
3368−
3369− STRING_DEL(parser, leading_break);
3370− STRING_DEL(parser, trailing_breaks);
3371− STRING_DEL(parser, whitespaces);
3372−
3373− return 1;
3374−
3375−error:
3376− STRING_DEL(parser, string);
3377− STRING_DEL(parser, leading_break);
3378− STRING_DEL(parser, trailing_breaks);
3379− STRING_DEL(parser, whitespaces);
3380−
3381− return 0;
3382−}
3383−
3384−/*
3385− * Scan a plain scalar.
3386− */
3387−
3388−static int
3389−yaml_parser_scan_plain_scalar(yaml_parser_t *parser, yaml_token_t *token)
3390−{
3391− yaml_mark_t start_mark;
3392− yaml_mark_t end_mark;
3393− yaml_string_t string = NULL_STRING;
3394− yaml_string_t leading_break = NULL_STRING;
3395− yaml_string_t trailing_breaks = NULL_STRING;
3396− yaml_string_t whitespaces = NULL_STRING;
3397− int leading_blanks = 0;
3398− int indent = parser->indent+1;
3399−
3400− if (!STRING_INIT(parser, string, INITIAL_STRING_SIZE)) goto error;
3401− if (!STRING_INIT(parser, leading_break, INITIAL_STRING_SIZE)) goto error;
3402− if (!STRING_INIT(parser, trailing_breaks, INITIAL_STRING_SIZE)) goto error;
3403− if (!STRING_INIT(parser, whitespaces, INITIAL_STRING_SIZE)) goto error;
3404−
3405− start_mark = end_mark = parser->mark;
3406−
3407− /* Consume the content of the plain scalar. */
3408−
3409− while (1)
3410− {
3411− /* Check for a document indicator. */
3412−
3413− if (!CACHE(parser, 4)) goto error;
3414−
3415− if (parser->mark.column == 0 &&
3416− ((CHECK_AT(parser->buffer, '-', 0) &&
3417− CHECK_AT(parser->buffer, '-', 1) &&
3418− CHECK_AT(parser->buffer, '-', 2)) ||
3419− (CHECK_AT(parser->buffer, '.', 0) &&
3420− CHECK_AT(parser->buffer, '.', 1) &&
3421− CHECK_AT(parser->buffer, '.', 2))) &&
3422− IS_BLANKZ_AT(parser->buffer, 3)) break;
3423−
3424− /* Check for a comment. */
3425−
3426− if (CHECK(parser->buffer, '#'))
3427− break;
3428−
3429− /* Consume non-blank characters. */
3430−
3431− while (!IS_BLANKZ(parser->buffer))
3432− {
3433− /* Check for "x:" + one of ',?[]{}' in the flow context. TODO: Fix the test "spec-08-13".
3434− * This is not completely according to the spec
3435− * See http://yaml.org/spec/1.1/#id907281 9.1.3. Plain
3436− */
3437−
3438− if (parser->flow_level
3439− && CHECK(parser->buffer, ':')
3440− && (
3441− CHECK_AT(parser->buffer, ',', 1)
3442− || CHECK_AT(parser->buffer, '?', 1)
3443− || CHECK_AT(parser->buffer, '[', 1)
3444− || CHECK_AT(parser->buffer, ']', 1)
3445− || CHECK_AT(parser->buffer, '{', 1)
3446− || CHECK_AT(parser->buffer, '}', 1)
3447− )
3448− ) {
3449− yaml_parser_set_scanner_error(parser, "while scanning a plain scalar",
3450− start_mark, "found unexpected ':'");
3451− goto error;
3452− }
3453−
3454− /* Check for indicators that may end a plain scalar. */
3455−
3456− if ((CHECK(parser->buffer, ':') && IS_BLANKZ_AT(parser->buffer, 1))
3457− || (parser->flow_level &&
3458− (CHECK(parser->buffer, ',')
3459− || CHECK(parser->buffer, '?') || CHECK(parser->buffer, '[')
3460− || CHECK(parser->buffer, ']') || CHECK(parser->buffer, '{')
3461− || CHECK(parser->buffer, '}'))))
3462− break;
3463−
3464− /* Check if we need to join whitespaces and breaks. */
3465−
3466− if (leading_blanks || whitespaces.start != whitespaces.pointer)
3467− {
3468− if (leading_blanks)
3469− {
3470− /* Do we need to fold line breaks? */
3471−
3472− if (leading_break.start[0] == '\n') {
3473− if (trailing_breaks.start[0] == '\0') {
3474− if (!STRING_EXTEND(parser, string)) goto error;
3475− *(string.pointer++) = ' ';
3476− }
3477− else {
3478− if (!JOIN(parser, string, trailing_breaks)) goto error;
3479− CLEAR(parser, trailing_breaks);
3480− }
3481− CLEAR(parser, leading_break);
3482− }
3483− else {
3484− if (!JOIN(parser, string, leading_break)) goto error;
3485− if (!JOIN(parser, string, trailing_breaks)) goto error;
3486− CLEAR(parser, leading_break);
3487− CLEAR(parser, trailing_breaks);
3488− }
3489−
3490− leading_blanks = 0;
3491− }
3492− else
3493− {
3494− if (!JOIN(parser, string, whitespaces)) goto error;
3495− CLEAR(parser, whitespaces);
3496− }
3497− }
3498−
3499− /* Copy the character. */
3500−
3501− if (!READ(parser, string)) goto error;
3502−
3503− end_mark = parser->mark;
3504−
3505− if (!CACHE(parser, 2)) goto error;
3506− }
3507−
3508− /* Is it the end? */
3509−
3510− if (!(IS_BLANK(parser->buffer) || IS_BREAK(parser->buffer)))
3511− break;
3512−
3513− /* Consume blank characters. */
3514−
3515− if (!CACHE(parser, 1)) goto error;
3516−
3517− while (IS_BLANK(parser->buffer) || IS_BREAK(parser->buffer))
3518− {
3519− if (IS_BLANK(parser->buffer))
3520− {
3521− /* Check for tab character that abuse indentation. */
3522−
3523− if (leading_blanks && (int)parser->mark.column < indent
3524− && IS_TAB(parser->buffer)) {
3525− yaml_parser_set_scanner_error(parser, "while scanning a plain scalar",
3526− start_mark, "found a tab character that violate indentation");
3527− goto error;
3528− }
3529−
3530− /* Consume a space or a tab character. */
3531−
3532− if (!leading_blanks) {
3533− if (!READ(parser, whitespaces)) goto error;
3534− }
3535− else {
3536− SKIP(parser);
3537− }
3538− }
3539− else
3540− {
3541− if (!CACHE(parser, 2)) goto error;
3542−
3543− /* Check if it is a first line break. */
3544−
3545− if (!leading_blanks)
3546− {
3547− CLEAR(parser, whitespaces);
3548− if (!READ_LINE(parser, leading_break)) goto error;
3549− leading_blanks = 1;
3550− }
3551− else
3552− {
3553− if (!READ_LINE(parser, trailing_breaks)) goto error;
3554− }
3555− }
3556− if (!CACHE(parser, 1)) goto error;
3557− }
3558−
3559− /* Check indentation level. */
3560−
3561− if (!parser->flow_level && (int)parser->mark.column < indent)
3562− break;
3563− }
3564−
3565− /* Create a token. */
3566−
3567− SCALAR_TOKEN_INIT(*token, string.start, string.pointer-string.start,
3568− YAML_PLAIN_SCALAR_STYLE, start_mark, end_mark);
3569−
3570− /* Note that we change the 'simple_key_allowed' flag. */
3571−
3572− if (leading_blanks) {
3573− parser->simple_key_allowed = 1;
3574− }
3575−
3576− STRING_DEL(parser, leading_break);
3577− STRING_DEL(parser, trailing_breaks);
3578− STRING_DEL(parser, whitespaces);
3579−
3580− return 1;
3581−
3582−error:
3583− STRING_DEL(parser, string);
3584− STRING_DEL(parser, leading_break);
3585− STRING_DEL(parser, trailing_breaks);
3586− STRING_DEL(parser, whitespaces);
3587−
3588− return 0;
3589−}