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