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source: trunk/packages/libyaml/src/emitter.c @ 1716

Last change on this file since 1716 was 898, checked in by hartmans, 16 years ago
Add pyyaml and libyaml packages backported from lenny. There is discussion about how these should go in the repository; these are added in this form in order to make forward progress.
File size: 63.2 KB

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

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