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ruby--ruby/ext/psych/yaml/parser.c
tenderlove e8132aa4d7 * ext/psych/yaml/emitter.c: merge libyaml 0.1.5 
* ext/psych/yaml/loader.c: ditto
* ext/psych/yaml/parser.c: ditto
* ext/psych/yaml/reader.c: ditto
* ext/psych/yaml/scanner.c: ditto
* ext/psych/yaml/writer.c: ditto
* ext/psych/yaml/yaml_private.h: ditto

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44809 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
2014-02-04 19:18:01 +00:00

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/*
* The parser implements the following grammar:
*
* stream ::= STREAM-START implicit_document? explicit_document* STREAM-END
* implicit_document ::= block_node DOCUMENT-END*
* explicit_document ::= DIRECTIVE* DOCUMENT-START block_node? DOCUMENT-END*
* block_node_or_indentless_sequence ::=
* ALIAS
* | properties (block_content | indentless_block_sequence)?
* | block_content
* | indentless_block_sequence
* block_node ::= ALIAS
* | properties block_content?
* | block_content
* flow_node ::= ALIAS
* | properties flow_content?
* | flow_content
* properties ::= TAG ANCHOR? | ANCHOR TAG?
* block_content ::= block_collection | flow_collection | SCALAR
* flow_content ::= flow_collection | SCALAR
* block_collection ::= block_sequence | block_mapping
* flow_collection ::= flow_sequence | flow_mapping
* block_sequence ::= BLOCK-SEQUENCE-START (BLOCK-ENTRY block_node?)* BLOCK-END
* indentless_sequence ::= (BLOCK-ENTRY block_node?)+
* block_mapping ::= BLOCK-MAPPING_START
* ((KEY block_node_or_indentless_sequence?)?
* (VALUE block_node_or_indentless_sequence?)?)*
* BLOCK-END
* flow_sequence ::= FLOW-SEQUENCE-START
* (flow_sequence_entry FLOW-ENTRY)*
* flow_sequence_entry?
* FLOW-SEQUENCE-END
* flow_sequence_entry ::= flow_node | KEY flow_node? (VALUE flow_node?)?
* flow_mapping ::= FLOW-MAPPING-START
* (flow_mapping_entry FLOW-ENTRY)*
* flow_mapping_entry?
* FLOW-MAPPING-END
* flow_mapping_entry ::= flow_node | KEY flow_node? (VALUE flow_node?)?
*/
#include "yaml_private.h"
/*
* Peek the next token in the token queue.
*/
#define PEEK_TOKEN(parser) \
((parser->token_available || yaml_parser_fetch_more_tokens(parser)) ? \
parser->tokens.head : NULL)
/*
* Remove the next token from the queue (must be called after PEEK_TOKEN).
*/
#define SKIP_TOKEN(parser) \
(parser->token_available = 0, \
parser->tokens_parsed ++, \
parser->stream_end_produced = \
(parser->tokens.head->type == YAML_STREAM_END_TOKEN), \
parser->tokens.head ++)
/*
* Public API declarations.
*/
YAML_DECLARE(int)
yaml_parser_parse(yaml_parser_t *parser, yaml_event_t *event);
/*
* Error handling.
*/
static int
yaml_parser_set_parser_error(yaml_parser_t *parser,
const char *problem, yaml_mark_t problem_mark);
static int
yaml_parser_set_parser_error_context(yaml_parser_t *parser,
const char *context, yaml_mark_t context_mark,
const char *problem, yaml_mark_t problem_mark);
/*
* State functions.
*/
static int
yaml_parser_state_machine(yaml_parser_t *parser, yaml_event_t *event);
static int
yaml_parser_parse_stream_start(yaml_parser_t *parser, yaml_event_t *event);
static int
yaml_parser_parse_document_start(yaml_parser_t *parser, yaml_event_t *event,
int implicit);
static int
yaml_parser_parse_document_content(yaml_parser_t *parser, yaml_event_t *event);
static int
yaml_parser_parse_document_end(yaml_parser_t *parser, yaml_event_t *event);
static int
yaml_parser_parse_node(yaml_parser_t *parser, yaml_event_t *event,
int block, int indentless_sequence);
static int
yaml_parser_parse_block_sequence_entry(yaml_parser_t *parser,
yaml_event_t *event, int first);
static int
yaml_parser_parse_indentless_sequence_entry(yaml_parser_t *parser,
yaml_event_t *event);
static int
yaml_parser_parse_block_mapping_key(yaml_parser_t *parser,
yaml_event_t *event, int first);
static int
yaml_parser_parse_block_mapping_value(yaml_parser_t *parser,
yaml_event_t *event);
static int
yaml_parser_parse_flow_sequence_entry(yaml_parser_t *parser,
yaml_event_t *event, int first);
static int
yaml_parser_parse_flow_sequence_entry_mapping_key(yaml_parser_t *parser,
yaml_event_t *event);
static int
yaml_parser_parse_flow_sequence_entry_mapping_value(yaml_parser_t *parser,
yaml_event_t *event);
static int
yaml_parser_parse_flow_sequence_entry_mapping_end(yaml_parser_t *parser,
yaml_event_t *event);
static int
yaml_parser_parse_flow_mapping_key(yaml_parser_t *parser,
yaml_event_t *event, int first);
static int
yaml_parser_parse_flow_mapping_value(yaml_parser_t *parser,
yaml_event_t *event, int empty);
/*
* Utility functions.
*/
static int
yaml_parser_process_empty_scalar(yaml_parser_t *parser,
yaml_event_t *event, yaml_mark_t mark);
static int
yaml_parser_process_directives(yaml_parser_t *parser,
yaml_version_directive_t **version_directive_ref,
yaml_tag_directive_t **tag_directives_start_ref,
yaml_tag_directive_t **tag_directives_end_ref);
static int
yaml_parser_append_tag_directive(yaml_parser_t *parser,
yaml_tag_directive_t value, int allow_duplicates, yaml_mark_t mark);
/*
* Get the next event.
*/
YAML_DECLARE(int)
yaml_parser_parse(yaml_parser_t *parser, yaml_event_t *event)
{
assert(parser); /* Non-NULL parser object is expected. */
assert(event); /* Non-NULL event object is expected. */
/* Erase the event object. */
memset(event, 0, sizeof(yaml_event_t));
/* No events after the end of the stream or error. */
if (parser->stream_end_produced || parser->error ||
parser->state == YAML_PARSE_END_STATE) {
return 1;
}
/* Generate the next event. */
return yaml_parser_state_machine(parser, event);
}
/*
* Set parser error.
*/
static int
yaml_parser_set_parser_error(yaml_parser_t *parser,
const char *problem, yaml_mark_t problem_mark)
{
parser->error = YAML_PARSER_ERROR;
parser->problem = problem;
parser->problem_mark = problem_mark;
return 0;
}
static int
yaml_parser_set_parser_error_context(yaml_parser_t *parser,
const char *context, yaml_mark_t context_mark,
const char *problem, yaml_mark_t problem_mark)
{
parser->error = YAML_PARSER_ERROR;
parser->context = context;
parser->context_mark = context_mark;
parser->problem = problem;
parser->problem_mark = problem_mark;
return 0;
}
/*
* State dispatcher.
*/
static int
yaml_parser_state_machine(yaml_parser_t *parser, yaml_event_t *event)
{
switch (parser->state)
{
case YAML_PARSE_STREAM_START_STATE:
return yaml_parser_parse_stream_start(parser, event);
case YAML_PARSE_IMPLICIT_DOCUMENT_START_STATE:
return yaml_parser_parse_document_start(parser, event, 1);
case YAML_PARSE_DOCUMENT_START_STATE:
return yaml_parser_parse_document_start(parser, event, 0);
case YAML_PARSE_DOCUMENT_CONTENT_STATE:
return yaml_parser_parse_document_content(parser, event);
case YAML_PARSE_DOCUMENT_END_STATE:
return yaml_parser_parse_document_end(parser, event);
case YAML_PARSE_BLOCK_NODE_STATE:
return yaml_parser_parse_node(parser, event, 1, 0);
case YAML_PARSE_BLOCK_NODE_OR_INDENTLESS_SEQUENCE_STATE:
return yaml_parser_parse_node(parser, event, 1, 1);
case YAML_PARSE_FLOW_NODE_STATE:
return yaml_parser_parse_node(parser, event, 0, 0);
case YAML_PARSE_BLOCK_SEQUENCE_FIRST_ENTRY_STATE:
return yaml_parser_parse_block_sequence_entry(parser, event, 1);
case YAML_PARSE_BLOCK_SEQUENCE_ENTRY_STATE:
return yaml_parser_parse_block_sequence_entry(parser, event, 0);
case YAML_PARSE_INDENTLESS_SEQUENCE_ENTRY_STATE:
return yaml_parser_parse_indentless_sequence_entry(parser, event);
case YAML_PARSE_BLOCK_MAPPING_FIRST_KEY_STATE:
return yaml_parser_parse_block_mapping_key(parser, event, 1);
case YAML_PARSE_BLOCK_MAPPING_KEY_STATE:
return yaml_parser_parse_block_mapping_key(parser, event, 0);
case YAML_PARSE_BLOCK_MAPPING_VALUE_STATE:
return yaml_parser_parse_block_mapping_value(parser, event);
case YAML_PARSE_FLOW_SEQUENCE_FIRST_ENTRY_STATE:
return yaml_parser_parse_flow_sequence_entry(parser, event, 1);
case YAML_PARSE_FLOW_SEQUENCE_ENTRY_STATE:
return yaml_parser_parse_flow_sequence_entry(parser, event, 0);
case YAML_PARSE_FLOW_SEQUENCE_ENTRY_MAPPING_KEY_STATE:
return yaml_parser_parse_flow_sequence_entry_mapping_key(parser, event);
case YAML_PARSE_FLOW_SEQUENCE_ENTRY_MAPPING_VALUE_STATE:
return yaml_parser_parse_flow_sequence_entry_mapping_value(parser, event);
case YAML_PARSE_FLOW_SEQUENCE_ENTRY_MAPPING_END_STATE:
return yaml_parser_parse_flow_sequence_entry_mapping_end(parser, event);
case YAML_PARSE_FLOW_MAPPING_FIRST_KEY_STATE:
return yaml_parser_parse_flow_mapping_key(parser, event, 1);
case YAML_PARSE_FLOW_MAPPING_KEY_STATE:
return yaml_parser_parse_flow_mapping_key(parser, event, 0);
case YAML_PARSE_FLOW_MAPPING_VALUE_STATE:
return yaml_parser_parse_flow_mapping_value(parser, event, 0);
case YAML_PARSE_FLOW_MAPPING_EMPTY_VALUE_STATE:
return yaml_parser_parse_flow_mapping_value(parser, event, 1);
default:
assert(1); /* Invalid state. */
}
return 0;
}
/*
* Parse the production:
* stream ::= STREAM-START implicit_document? explicit_document* STREAM-END
* ************
*/
static int
yaml_parser_parse_stream_start(yaml_parser_t *parser, yaml_event_t *event)
{
yaml_token_t *token;
token = PEEK_TOKEN(parser);
if (!token) return 0;
if (token->type != YAML_STREAM_START_TOKEN) {
return yaml_parser_set_parser_error(parser,
"did not find expected <stream-start>", token->start_mark);
}
parser->state = YAML_PARSE_IMPLICIT_DOCUMENT_START_STATE;
STREAM_START_EVENT_INIT(*event, token->data.stream_start.encoding,
token->start_mark, token->start_mark);
SKIP_TOKEN(parser);
return 1;
}
/*
* Parse the productions:
* implicit_document ::= block_node DOCUMENT-END*
* *
* explicit_document ::= DIRECTIVE* DOCUMENT-START block_node? DOCUMENT-END*
* *************************
*/
static int
yaml_parser_parse_document_start(yaml_parser_t *parser, yaml_event_t *event,
int implicit)
{
yaml_token_t *token;
yaml_version_directive_t *version_directive = NULL;
struct {
yaml_tag_directive_t *start;
yaml_tag_directive_t *end;
} tag_directives = { NULL, NULL };
token = PEEK_TOKEN(parser);
if (!token) return 0;
/* Parse extra document end indicators. */
if (!implicit)
{
while (token->type == YAML_DOCUMENT_END_TOKEN) {
SKIP_TOKEN(parser);
token = PEEK_TOKEN(parser);
if (!token) return 0;
}
}
/* Parse an implicit document. */
if (implicit && token->type != YAML_VERSION_DIRECTIVE_TOKEN &&
token->type != YAML_TAG_DIRECTIVE_TOKEN &&
token->type != YAML_DOCUMENT_START_TOKEN &&
token->type != YAML_STREAM_END_TOKEN)
{
if (!yaml_parser_process_directives(parser, NULL, NULL, NULL))
return 0;
if (!PUSH(parser, parser->states, YAML_PARSE_DOCUMENT_END_STATE))
return 0;
parser->state = YAML_PARSE_BLOCK_NODE_STATE;
DOCUMENT_START_EVENT_INIT(*event, NULL, NULL, NULL, 1,
token->start_mark, token->start_mark);
return 1;
}
/* Parse an explicit document. */
else if (token->type != YAML_STREAM_END_TOKEN)
{
yaml_mark_t start_mark, end_mark;
start_mark = token->start_mark;
if (!yaml_parser_process_directives(parser, &version_directive,
&tag_directives.start, &tag_directives.end))
return 0;
token = PEEK_TOKEN(parser);
if (!token) goto error;
if (token->type != YAML_DOCUMENT_START_TOKEN) {
yaml_parser_set_parser_error(parser,
"did not find expected <document start>", token->start_mark);
goto error;
}
if (!PUSH(parser, parser->states, YAML_PARSE_DOCUMENT_END_STATE))
goto error;
parser->state = YAML_PARSE_DOCUMENT_CONTENT_STATE;
end_mark = token->end_mark;
DOCUMENT_START_EVENT_INIT(*event, version_directive,
tag_directives.start, tag_directives.end, 0,
start_mark, end_mark);
SKIP_TOKEN(parser);
version_directive = NULL;
tag_directives.start = tag_directives.end = NULL;
return 1;
}
/* Parse the stream end. */
else
{
parser->state = YAML_PARSE_END_STATE;
STREAM_END_EVENT_INIT(*event, token->start_mark, token->end_mark);
SKIP_TOKEN(parser);
return 1;
}
error:
yaml_free(version_directive);
while (tag_directives.start != tag_directives.end) {
yaml_free(tag_directives.end[-1].handle);
yaml_free(tag_directives.end[-1].prefix);
tag_directives.end --;
}
yaml_free(tag_directives.start);
return 0;
}
/*
* Parse the productions:
* explicit_document ::= DIRECTIVE* DOCUMENT-START block_node? DOCUMENT-END*
* ***********
*/
static int
yaml_parser_parse_document_content(yaml_parser_t *parser, yaml_event_t *event)
{
yaml_token_t *token;
token = PEEK_TOKEN(parser);
if (!token) return 0;
if (token->type == YAML_VERSION_DIRECTIVE_TOKEN ||
token->type == YAML_TAG_DIRECTIVE_TOKEN ||
token->type == YAML_DOCUMENT_START_TOKEN ||
token->type == YAML_DOCUMENT_END_TOKEN ||
token->type == YAML_STREAM_END_TOKEN) {
parser->state = POP(parser, parser->states);
return yaml_parser_process_empty_scalar(parser, event,
token->start_mark);
}
else {
return yaml_parser_parse_node(parser, event, 1, 0);
}
}
/*
* Parse the productions:
* implicit_document ::= block_node DOCUMENT-END*
* *************
* explicit_document ::= DIRECTIVE* DOCUMENT-START block_node? DOCUMENT-END*
* *************
*/
static int
yaml_parser_parse_document_end(yaml_parser_t *parser, yaml_event_t *event)
{
yaml_token_t *token;
yaml_mark_t start_mark, end_mark;
int implicit = 1;
token = PEEK_TOKEN(parser);
if (!token) return 0;
start_mark = end_mark = token->start_mark;
if (token->type == YAML_DOCUMENT_END_TOKEN) {
end_mark = token->end_mark;
SKIP_TOKEN(parser);
implicit = 0;
}
while (!STACK_EMPTY(parser, parser->tag_directives)) {
yaml_tag_directive_t tag_directive = POP(parser, parser->tag_directives);
yaml_free(tag_directive.handle);
yaml_free(tag_directive.prefix);
}
parser->state = YAML_PARSE_DOCUMENT_START_STATE;
DOCUMENT_END_EVENT_INIT(*event, implicit, start_mark, end_mark);
return 1;
}
/*
* Parse the productions:
* block_node_or_indentless_sequence ::=
* ALIAS
* *****
* | properties (block_content | indentless_block_sequence)?
* ********** *
* | block_content | indentless_block_sequence
* *
* block_node ::= ALIAS
* *****
* | properties block_content?
* ********** *
* | block_content
* *
* flow_node ::= ALIAS
* *****
* | properties flow_content?
* ********** *
* | flow_content
* *
* properties ::= TAG ANCHOR? | ANCHOR TAG?
* *************************
* block_content ::= block_collection | flow_collection | SCALAR
* ******
* flow_content ::= flow_collection | SCALAR
* ******
*/
static int
yaml_parser_parse_node(yaml_parser_t *parser, yaml_event_t *event,
int block, int indentless_sequence)
{
yaml_token_t *token;
yaml_char_t *anchor = NULL;
yaml_char_t *tag_handle = NULL;
yaml_char_t *tag_suffix = NULL;
yaml_char_t *tag = NULL;
yaml_mark_t start_mark, end_mark, tag_mark;
int implicit;
token = PEEK_TOKEN(parser);
if (!token) return 0;
if (token->type == YAML_ALIAS_TOKEN)
{
parser->state = POP(parser, parser->states);
ALIAS_EVENT_INIT(*event, token->data.alias.value,
token->start_mark, token->end_mark);
SKIP_TOKEN(parser);
return 1;
}
else
{
start_mark = end_mark = token->start_mark;
if (token->type == YAML_ANCHOR_TOKEN)
{
anchor = token->data.anchor.value;
start_mark = token->start_mark;
end_mark = token->end_mark;
SKIP_TOKEN(parser);
token = PEEK_TOKEN(parser);
if (!token) goto error;
if (token->type == YAML_TAG_TOKEN)
{
tag_handle = token->data.tag.handle;
tag_suffix = token->data.tag.suffix;
tag_mark = token->start_mark;
end_mark = token->end_mark;
SKIP_TOKEN(parser);
token = PEEK_TOKEN(parser);
if (!token) goto error;
}
}
else if (token->type == YAML_TAG_TOKEN)
{
tag_handle = token->data.tag.handle;
tag_suffix = token->data.tag.suffix;
start_mark = tag_mark = token->start_mark;
end_mark = token->end_mark;
SKIP_TOKEN(parser);
token = PEEK_TOKEN(parser);
if (!token) goto error;
if (token->type == YAML_ANCHOR_TOKEN)
{
anchor = token->data.anchor.value;
end_mark = token->end_mark;
SKIP_TOKEN(parser);
token = PEEK_TOKEN(parser);
if (!token) goto error;
}
}
if (tag_handle) {
if (!*tag_handle) {
tag = tag_suffix;
yaml_free(tag_handle);
tag_handle = tag_suffix = NULL;
}
else {
yaml_tag_directive_t *tag_directive;
for (tag_directive = parser->tag_directives.start;
tag_directive != parser->tag_directives.top;
tag_directive ++) {
if (strcmp((char *)tag_directive->handle, (char *)tag_handle) == 0) {
size_t prefix_len = strlen((char *)tag_directive->prefix);
size_t suffix_len = strlen((char *)tag_suffix);
tag = yaml_malloc(prefix_len+suffix_len+1);
if (!tag) {
parser->error = YAML_MEMORY_ERROR;
goto error;
}
memcpy(tag, tag_directive->prefix, prefix_len);
memcpy(tag+prefix_len, tag_suffix, suffix_len);
tag[prefix_len+suffix_len] = '\0';
yaml_free(tag_handle);
yaml_free(tag_suffix);
tag_handle = tag_suffix = NULL;
break;
}
}
if (!tag) {
yaml_parser_set_parser_error_context(parser,
"while parsing a node", start_mark,
"found undefined tag handle", tag_mark);
goto error;
}
}
}
implicit = (!tag || !*tag);
if (indentless_sequence && token->type == YAML_BLOCK_ENTRY_TOKEN) {
end_mark = token->end_mark;
parser->state = YAML_PARSE_INDENTLESS_SEQUENCE_ENTRY_STATE;
SEQUENCE_START_EVENT_INIT(*event, anchor, tag, implicit,
YAML_BLOCK_SEQUENCE_STYLE, start_mark, end_mark);
return 1;
}
else {
if (token->type == YAML_SCALAR_TOKEN) {
int plain_implicit = 0;
int quoted_implicit = 0;
end_mark = token->end_mark;
if ((token->data.scalar.style == YAML_PLAIN_SCALAR_STYLE && !tag)
|| (tag && strcmp((char *)tag, "!") == 0)) {
plain_implicit = 1;
}
else if (!tag) {
quoted_implicit = 1;
}
parser->state = POP(parser, parser->states);
SCALAR_EVENT_INIT(*event, anchor, tag,
token->data.scalar.value, token->data.scalar.length,
plain_implicit, quoted_implicit,
token->data.scalar.style, start_mark, end_mark);
SKIP_TOKEN(parser);
return 1;
}
else if (token->type == YAML_FLOW_SEQUENCE_START_TOKEN) {
end_mark = token->end_mark;
parser->state = YAML_PARSE_FLOW_SEQUENCE_FIRST_ENTRY_STATE;
SEQUENCE_START_EVENT_INIT(*event, anchor, tag, implicit,
YAML_FLOW_SEQUENCE_STYLE, start_mark, end_mark);
return 1;
}
else if (token->type == YAML_FLOW_MAPPING_START_TOKEN) {
end_mark = token->end_mark;
parser->state = YAML_PARSE_FLOW_MAPPING_FIRST_KEY_STATE;
MAPPING_START_EVENT_INIT(*event, anchor, tag, implicit,
YAML_FLOW_MAPPING_STYLE, start_mark, end_mark);
return 1;
}
else if (block && token->type == YAML_BLOCK_SEQUENCE_START_TOKEN) {
end_mark = token->end_mark;
parser->state = YAML_PARSE_BLOCK_SEQUENCE_FIRST_ENTRY_STATE;
SEQUENCE_START_EVENT_INIT(*event, anchor, tag, implicit,
YAML_BLOCK_SEQUENCE_STYLE, start_mark, end_mark);
return 1;
}
else if (block && token->type == YAML_BLOCK_MAPPING_START_TOKEN) {
end_mark = token->end_mark;
parser->state = YAML_PARSE_BLOCK_MAPPING_FIRST_KEY_STATE;
MAPPING_START_EVENT_INIT(*event, anchor, tag, implicit,
YAML_BLOCK_MAPPING_STYLE, start_mark, end_mark);
return 1;
}
else if (anchor || tag) {
yaml_char_t *value = yaml_malloc(1);
if (!value) {
parser->error = YAML_MEMORY_ERROR;
goto error;
}
value[0] = '\0';
parser->state = POP(parser, parser->states);
SCALAR_EVENT_INIT(*event, anchor, tag, value, 0,
implicit, 0, YAML_PLAIN_SCALAR_STYLE,
start_mark, end_mark);
return 1;
}
else {
yaml_parser_set_parser_error_context(parser,
(block ? "while parsing a block node"
: "while parsing a flow node"), start_mark,
"did not find expected node content", token->start_mark);
goto error;
}
}
}
error:
yaml_free(anchor);
yaml_free(tag_handle);
yaml_free(tag_suffix);
yaml_free(tag);
return 0;
}
/*
* Parse the productions:
* block_sequence ::= BLOCK-SEQUENCE-START (BLOCK-ENTRY block_node?)* BLOCK-END
* ******************** *********** * *********
*/
static int
yaml_parser_parse_block_sequence_entry(yaml_parser_t *parser,
yaml_event_t *event, int first)
{
yaml_token_t *token;
if (first) {
token = PEEK_TOKEN(parser);
if (!PUSH(parser, parser->marks, token->start_mark))
return 0;
SKIP_TOKEN(parser);
}
token = PEEK_TOKEN(parser);
if (!token) return 0;
if (token->type == YAML_BLOCK_ENTRY_TOKEN)
{
yaml_mark_t mark = token->end_mark;
SKIP_TOKEN(parser);
token = PEEK_TOKEN(parser);
if (!token) return 0;
if (token->type != YAML_BLOCK_ENTRY_TOKEN &&
token->type != YAML_BLOCK_END_TOKEN) {
if (!PUSH(parser, parser->states,
YAML_PARSE_BLOCK_SEQUENCE_ENTRY_STATE))
return 0;
return yaml_parser_parse_node(parser, event, 1, 0);
}
else {
parser->state = YAML_PARSE_BLOCK_SEQUENCE_ENTRY_STATE;
return yaml_parser_process_empty_scalar(parser, event, mark);
}
}
else if (token->type == YAML_BLOCK_END_TOKEN)
{
yaml_mark_t dummy_mark; /* Used to eliminate a compiler warning. */
parser->state = POP(parser, parser->states);
dummy_mark = POP(parser, parser->marks);
SEQUENCE_END_EVENT_INIT(*event, token->start_mark, token->end_mark);
SKIP_TOKEN(parser);
return 1;
}
else
{
return yaml_parser_set_parser_error_context(parser,
"while parsing a block collection", POP(parser, parser->marks),
"did not find expected '-' indicator", token->start_mark);
}
}
/*
* Parse the productions:
* indentless_sequence ::= (BLOCK-ENTRY block_node?)+
* *********** *
*/
static int
yaml_parser_parse_indentless_sequence_entry(yaml_parser_t *parser,
yaml_event_t *event)
{
yaml_token_t *token;
token = PEEK_TOKEN(parser);
if (!token) return 0;
if (token->type == YAML_BLOCK_ENTRY_TOKEN)
{
yaml_mark_t mark = token->end_mark;
SKIP_TOKEN(parser);
token = PEEK_TOKEN(parser);
if (!token) return 0;
if (token->type != YAML_BLOCK_ENTRY_TOKEN &&
token->type != YAML_KEY_TOKEN &&
token->type != YAML_VALUE_TOKEN &&
token->type != YAML_BLOCK_END_TOKEN) {
if (!PUSH(parser, parser->states,
YAML_PARSE_INDENTLESS_SEQUENCE_ENTRY_STATE))
return 0;
return yaml_parser_parse_node(parser, event, 1, 0);
}
else {
parser->state = YAML_PARSE_INDENTLESS_SEQUENCE_ENTRY_STATE;
return yaml_parser_process_empty_scalar(parser, event, mark);
}
}
else
{
parser->state = POP(parser, parser->states);
SEQUENCE_END_EVENT_INIT(*event, token->start_mark, token->start_mark);
return 1;
}
}
/*
* Parse the productions:
* block_mapping ::= BLOCK-MAPPING_START
* *******************
* ((KEY block_node_or_indentless_sequence?)?
* *** *
* (VALUE block_node_or_indentless_sequence?)?)*
*
* BLOCK-END
* *********
*/
static int
yaml_parser_parse_block_mapping_key(yaml_parser_t *parser,
yaml_event_t *event, int first)
{
yaml_token_t *token;
if (first) {
token = PEEK_TOKEN(parser);
if (!PUSH(parser, parser->marks, token->start_mark))
return 0;
SKIP_TOKEN(parser);
}
token = PEEK_TOKEN(parser);
if (!token) return 0;
if (token->type == YAML_KEY_TOKEN)
{
yaml_mark_t mark = token->end_mark;
SKIP_TOKEN(parser);
token = PEEK_TOKEN(parser);
if (!token) return 0;
if (token->type != YAML_KEY_TOKEN &&
token->type != YAML_VALUE_TOKEN &&
token->type != YAML_BLOCK_END_TOKEN) {
if (!PUSH(parser, parser->states,
YAML_PARSE_BLOCK_MAPPING_VALUE_STATE))
return 0;
return yaml_parser_parse_node(parser, event, 1, 1);
}
else {
parser->state = YAML_PARSE_BLOCK_MAPPING_VALUE_STATE;
return yaml_parser_process_empty_scalar(parser, event, mark);
}
}
else if (token->type == YAML_BLOCK_END_TOKEN)
{
yaml_mark_t dummy_mark; /* Used to eliminate a compiler warning. */
parser->state = POP(parser, parser->states);
dummy_mark = POP(parser, parser->marks);
MAPPING_END_EVENT_INIT(*event, token->start_mark, token->end_mark);
SKIP_TOKEN(parser);
return 1;
}
else
{
return yaml_parser_set_parser_error_context(parser,
"while parsing a block mapping", POP(parser, parser->marks),
"did not find expected key", token->start_mark);
}
}
/*
* Parse the productions:
* block_mapping ::= BLOCK-MAPPING_START
*
* ((KEY block_node_or_indentless_sequence?)?
*
* (VALUE block_node_or_indentless_sequence?)?)*
* ***** *
* BLOCK-END
*
*/
static int
yaml_parser_parse_block_mapping_value(yaml_parser_t *parser,
yaml_event_t *event)
{
yaml_token_t *token;
token = PEEK_TOKEN(parser);
if (!token) return 0;
if (token->type == YAML_VALUE_TOKEN)
{
yaml_mark_t mark = token->end_mark;
SKIP_TOKEN(parser);
token = PEEK_TOKEN(parser);
if (!token) return 0;
if (token->type != YAML_KEY_TOKEN &&
token->type != YAML_VALUE_TOKEN &&
token->type != YAML_BLOCK_END_TOKEN) {
if (!PUSH(parser, parser->states,
YAML_PARSE_BLOCK_MAPPING_KEY_STATE))
return 0;
return yaml_parser_parse_node(parser, event, 1, 1);
}
else {
parser->state = YAML_PARSE_BLOCK_MAPPING_KEY_STATE;
return yaml_parser_process_empty_scalar(parser, event, mark);
}
}
else
{
parser->state = YAML_PARSE_BLOCK_MAPPING_KEY_STATE;
return yaml_parser_process_empty_scalar(parser, event, token->start_mark);
}
}
/*
* Parse the productions:
* flow_sequence ::= FLOW-SEQUENCE-START
* *******************
* (flow_sequence_entry FLOW-ENTRY)*
* * **********
* flow_sequence_entry?
* *
* FLOW-SEQUENCE-END
* *****************
* flow_sequence_entry ::= flow_node | KEY flow_node? (VALUE flow_node?)?
* *
*/
static int
yaml_parser_parse_flow_sequence_entry(yaml_parser_t *parser,
yaml_event_t *event, int first)
{
yaml_token_t *token;
yaml_mark_t dummy_mark; /* Used to eliminate a compiler warning. */
if (first) {
token = PEEK_TOKEN(parser);
if (!PUSH(parser, parser->marks, token->start_mark))
return 0;
SKIP_TOKEN(parser);
}
token = PEEK_TOKEN(parser);
if (!token) return 0;
if (token->type != YAML_FLOW_SEQUENCE_END_TOKEN)
{
if (!first) {
if (token->type == YAML_FLOW_ENTRY_TOKEN) {
SKIP_TOKEN(parser);
token = PEEK_TOKEN(parser);
if (!token) return 0;
}
else {
return yaml_parser_set_parser_error_context(parser,
"while parsing a flow sequence", POP(parser, parser->marks),
"did not find expected ',' or ']'", token->start_mark);
}
}
if (token->type == YAML_KEY_TOKEN) {
parser->state = YAML_PARSE_FLOW_SEQUENCE_ENTRY_MAPPING_KEY_STATE;
MAPPING_START_EVENT_INIT(*event, NULL, NULL,
1, YAML_FLOW_MAPPING_STYLE,
token->start_mark, token->end_mark);
SKIP_TOKEN(parser);
return 1;
}
else if (token->type != YAML_FLOW_SEQUENCE_END_TOKEN) {
if (!PUSH(parser, parser->states,
YAML_PARSE_FLOW_SEQUENCE_ENTRY_STATE))
return 0;
return yaml_parser_parse_node(parser, event, 0, 0);
}
}
parser->state = POP(parser, parser->states);
dummy_mark = POP(parser, parser->marks);
SEQUENCE_END_EVENT_INIT(*event, token->start_mark, token->end_mark);
SKIP_TOKEN(parser);
return 1;
}
/*
* Parse the productions:
* flow_sequence_entry ::= flow_node | KEY flow_node? (VALUE flow_node?)?
* *** *
*/
static int
yaml_parser_parse_flow_sequence_entry_mapping_key(yaml_parser_t *parser,
yaml_event_t *event)
{
yaml_token_t *token;
token = PEEK_TOKEN(parser);
if (!token) return 0;
if (token->type != YAML_VALUE_TOKEN && token->type != YAML_FLOW_ENTRY_TOKEN
&& token->type != YAML_FLOW_SEQUENCE_END_TOKEN) {
if (!PUSH(parser, parser->states,
YAML_PARSE_FLOW_SEQUENCE_ENTRY_MAPPING_VALUE_STATE))
return 0;
return yaml_parser_parse_node(parser, event, 0, 0);
}
else {
yaml_mark_t mark = token->end_mark;
SKIP_TOKEN(parser);
parser->state = YAML_PARSE_FLOW_SEQUENCE_ENTRY_MAPPING_VALUE_STATE;
return yaml_parser_process_empty_scalar(parser, event, mark);
}
}
/*
* Parse the productions:
* flow_sequence_entry ::= flow_node | KEY flow_node? (VALUE flow_node?)?
* ***** *
*/
static int
yaml_parser_parse_flow_sequence_entry_mapping_value(yaml_parser_t *parser,
yaml_event_t *event)
{
yaml_token_t *token;
token = PEEK_TOKEN(parser);
if (!token) return 0;
if (token->type == YAML_VALUE_TOKEN) {
SKIP_TOKEN(parser);
token = PEEK_TOKEN(parser);
if (!token) return 0;
if (token->type != YAML_FLOW_ENTRY_TOKEN
&& token->type != YAML_FLOW_SEQUENCE_END_TOKEN) {
if (!PUSH(parser, parser->states,
YAML_PARSE_FLOW_SEQUENCE_ENTRY_MAPPING_END_STATE))
return 0;
return yaml_parser_parse_node(parser, event, 0, 0);
}
}
parser->state = YAML_PARSE_FLOW_SEQUENCE_ENTRY_MAPPING_END_STATE;
return yaml_parser_process_empty_scalar(parser, event, token->start_mark);
}
/*
* Parse the productions:
* flow_sequence_entry ::= flow_node | KEY flow_node? (VALUE flow_node?)?
* *
*/
static int
yaml_parser_parse_flow_sequence_entry_mapping_end(yaml_parser_t *parser,
yaml_event_t *event)
{
yaml_token_t *token;
token = PEEK_TOKEN(parser);
if (!token) return 0;
parser->state = YAML_PARSE_FLOW_SEQUENCE_ENTRY_STATE;
MAPPING_END_EVENT_INIT(*event, token->start_mark, token->start_mark);
return 1;
}
/*
* Parse the productions:
* flow_mapping ::= FLOW-MAPPING-START
* ******************
* (flow_mapping_entry FLOW-ENTRY)*
* * **********
* flow_mapping_entry?
* ******************
* FLOW-MAPPING-END
* ****************
* flow_mapping_entry ::= flow_node | KEY flow_node? (VALUE flow_node?)?
* * *** *
*/
static int
yaml_parser_parse_flow_mapping_key(yaml_parser_t *parser,
yaml_event_t *event, int first)
{
yaml_token_t *token;
yaml_mark_t dummy_mark; /* Used to eliminate a compiler warning. */
if (first) {
token = PEEK_TOKEN(parser);
if (!PUSH(parser, parser->marks, token->start_mark))
return 0;
SKIP_TOKEN(parser);
}
token = PEEK_TOKEN(parser);
if (!token) return 0;
if (token->type != YAML_FLOW_MAPPING_END_TOKEN)
{
if (!first) {
if (token->type == YAML_FLOW_ENTRY_TOKEN) {
SKIP_TOKEN(parser);
token = PEEK_TOKEN(parser);
if (!token) return 0;
}
else {
return yaml_parser_set_parser_error_context(parser,
"while parsing a flow mapping", POP(parser, parser->marks),
"did not find expected ',' or '}'", token->start_mark);
}
}
if (token->type == YAML_KEY_TOKEN) {
SKIP_TOKEN(parser);
token = PEEK_TOKEN(parser);
if (!token) return 0;
if (token->type != YAML_VALUE_TOKEN
&& token->type != YAML_FLOW_ENTRY_TOKEN
&& token->type != YAML_FLOW_MAPPING_END_TOKEN) {
if (!PUSH(parser, parser->states,
YAML_PARSE_FLOW_MAPPING_VALUE_STATE))
return 0;
return yaml_parser_parse_node(parser, event, 0, 0);
}
else {
parser->state = YAML_PARSE_FLOW_MAPPING_VALUE_STATE;
return yaml_parser_process_empty_scalar(parser, event,
token->start_mark);
}
}
else if (token->type != YAML_FLOW_MAPPING_END_TOKEN) {
if (!PUSH(parser, parser->states,
YAML_PARSE_FLOW_MAPPING_EMPTY_VALUE_STATE))
return 0;
return yaml_parser_parse_node(parser, event, 0, 0);
}
}
parser->state = POP(parser, parser->states);
dummy_mark = POP(parser, parser->marks);
MAPPING_END_EVENT_INIT(*event, token->start_mark, token->end_mark);
SKIP_TOKEN(parser);
return 1;
}
/*
* Parse the productions:
* flow_mapping_entry ::= flow_node | KEY flow_node? (VALUE flow_node?)?
* * ***** *
*/
static int
yaml_parser_parse_flow_mapping_value(yaml_parser_t *parser,
yaml_event_t *event, int empty)
{
yaml_token_t *token;
token = PEEK_TOKEN(parser);
if (!token) return 0;
if (empty) {
parser->state = YAML_PARSE_FLOW_MAPPING_KEY_STATE;
return yaml_parser_process_empty_scalar(parser, event,
token->start_mark);
}
if (token->type == YAML_VALUE_TOKEN) {
SKIP_TOKEN(parser);
token = PEEK_TOKEN(parser);
if (!token) return 0;
if (token->type != YAML_FLOW_ENTRY_TOKEN
&& token->type != YAML_FLOW_MAPPING_END_TOKEN) {
if (!PUSH(parser, parser->states,
YAML_PARSE_FLOW_MAPPING_KEY_STATE))
return 0;
return yaml_parser_parse_node(parser, event, 0, 0);
}
}
parser->state = YAML_PARSE_FLOW_MAPPING_KEY_STATE;
return yaml_parser_process_empty_scalar(parser, event, token->start_mark);
}
/*
* Generate an empty scalar event.
*/
static int
yaml_parser_process_empty_scalar(yaml_parser_t *parser, yaml_event_t *event,
yaml_mark_t mark)
{
yaml_char_t *value;
value = yaml_malloc(1);
if (!value) {
parser->error = YAML_MEMORY_ERROR;
return 0;
}
value[0] = '\0';
SCALAR_EVENT_INIT(*event, NULL, NULL, value, 0,
1, 0, YAML_PLAIN_SCALAR_STYLE, mark, mark);
return 1;
}
/*
* Parse directives.
*/
static int
yaml_parser_process_directives(yaml_parser_t *parser,
yaml_version_directive_t **version_directive_ref,
yaml_tag_directive_t **tag_directives_start_ref,
yaml_tag_directive_t **tag_directives_end_ref)
{
yaml_tag_directive_t default_tag_directives[] = {
{(yaml_char_t *)"!", (yaml_char_t *)"!"},
{(yaml_char_t *)"!!", (yaml_char_t *)"tag:yaml.org,2002:"},
{NULL, NULL}
};
yaml_tag_directive_t *default_tag_directive;
yaml_version_directive_t *version_directive = NULL;
struct {
yaml_tag_directive_t *start;
yaml_tag_directive_t *end;
yaml_tag_directive_t *top;
} tag_directives = { NULL, NULL, NULL };
yaml_token_t *token;
if (!STACK_INIT(parser, tag_directives, INITIAL_STACK_SIZE))
goto error;
token = PEEK_TOKEN(parser);
if (!token) goto error;
while (token->type == YAML_VERSION_DIRECTIVE_TOKEN ||
token->type == YAML_TAG_DIRECTIVE_TOKEN)
{
if (token->type == YAML_VERSION_DIRECTIVE_TOKEN) {
if (version_directive) {
yaml_parser_set_parser_error(parser,
"found duplicate %YAML directive", token->start_mark);
goto error;
}
if (token->data.version_directive.major != 1
|| token->data.version_directive.minor != 1) {
yaml_parser_set_parser_error(parser,
"found incompatible YAML document", token->start_mark);
goto error;
}
version_directive = yaml_malloc(sizeof(yaml_version_directive_t));
if (!version_directive) {
parser->error = YAML_MEMORY_ERROR;
goto error;
}
version_directive->major = token->data.version_directive.major;
version_directive->minor = token->data.version_directive.minor;
}
else if (token->type == YAML_TAG_DIRECTIVE_TOKEN) {
yaml_tag_directive_t value;
value.handle = token->data.tag_directive.handle;
value.prefix = token->data.tag_directive.prefix;
if (!yaml_parser_append_tag_directive(parser, value, 0,
token->start_mark))
goto error;
if (!PUSH(parser, tag_directives, value))
goto error;
}
SKIP_TOKEN(parser);
token = PEEK_TOKEN(parser);
if (!token) goto error;
}
for (default_tag_directive = default_tag_directives;
default_tag_directive->handle; default_tag_directive++) {
if (!yaml_parser_append_tag_directive(parser, *default_tag_directive, 1,
token->start_mark))
goto error;
}
if (version_directive_ref) {
*version_directive_ref = version_directive;
}
if (tag_directives_start_ref) {
if (STACK_EMPTY(parser, tag_directives)) {
*tag_directives_start_ref = *tag_directives_end_ref = NULL;
STACK_DEL(parser, tag_directives);
}
else {
*tag_directives_start_ref = tag_directives.start;
*tag_directives_end_ref = tag_directives.top;
}
}
else {
STACK_DEL(parser, tag_directives);
}
return 1;
error:
yaml_free(version_directive);
while (!STACK_EMPTY(parser, tag_directives)) {
yaml_tag_directive_t tag_directive = POP(parser, tag_directives);
yaml_free(tag_directive.handle);
yaml_free(tag_directive.prefix);
}
STACK_DEL(parser, tag_directives);
return 0;
}
/*
* Append a tag directive to the directives stack.
*/
static int
yaml_parser_append_tag_directive(yaml_parser_t *parser,
yaml_tag_directive_t value, int allow_duplicates, yaml_mark_t mark)
{
yaml_tag_directive_t *tag_directive;
yaml_tag_directive_t copy = { NULL, NULL };
for (tag_directive = parser->tag_directives.start;
tag_directive != parser->tag_directives.top; tag_directive ++) {
if (strcmp((char *)value.handle, (char *)tag_directive->handle) == 0) {
if (allow_duplicates)
return 1;
return yaml_parser_set_parser_error(parser,
"found duplicate %TAG directive", mark);
}
}
copy.handle = yaml_strdup(value.handle);
copy.prefix = yaml_strdup(value.prefix);
if (!copy.handle || !copy.prefix) {
parser->error = YAML_MEMORY_ERROR;
goto error;
}
if (!PUSH(parser, parser->tag_directives, copy))
goto error;
return 1;
error:
yaml_free(copy.handle);
yaml_free(copy.prefix);
return 0;
}
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