* %TAG !yaml! tag:yaml.org,2002:
* ---
*
- * The correspoding sequence of tokens:
+ * The corresponding sequence of tokens:
*
* STREAM-START(utf-8)
* VERSION-DIRECTIVE(1,1)
* BLOCK-END
*/
-#if HAVE_CONFIG_H
-#include <config.h>
-#endif
-
-#include <yaml/yaml.h>
-
-#include <assert.h>
+#include "yaml_private.h"
/*
* Ensure that the buffer contains the required number of characters.
* Return 1 on success, 0 on failure (reader error or memory error).
*/
-#define UPDATE(parser,length) \
- (parser->unread >= (length) \
- ? 1 \
+#define CACHE(parser,length) \
+ (parser->unread >= (length) \
+ ? 1 \
: yaml_parser_update_buffer(parser, (length)))
/*
- * Check the octet at the specified position.
- */
-
-#define CHECK_AT(parser,octet,offset) \
- (parser->buffer[offset] == (yaml_char_t)(octet))
-
-/*
- * Check the current octet in the buffer.
- */
-
-#define CHECK(parser,octet) CHECK_AT(parser,(octet),0)
-
-/*
- * Check if the character at the specified position is NUL.
- */
-
-#define IS_Z_AT(parser,offset) CHECK_AT(parser,'\0',(offset))
-
-#define IS_Z(parser) IS_Z_AT(parser,0)
-
-/*
- * Check if the character at the specified position is space.
- */
-
-#define IS_SPACE_AT(parser,offset) CHECK_AT(parser,' ',(offset))
-
-#define IS_SPACE(parser) IS_SPACE_AT(parser,0)
-
-/*
- * Check if the character at the specified position is tab.
- */
-
-#define IS_TAB_AT(parser,offset) CHECK_AT(parser,'\t',(offset))
-
-#define IS_TAB(parser) IS_TAB_AT(parser,0)
-
-/*
- * Check if the character at the specified position is blank (space or tab).
- */
-
-#define IS_BLANK_AT(parser,offset) \
- (IS_SPACE_AT(parser,(offset)) || IS_TAB_AT(parser,(offset)))
-
-#define IS_BLANK(parser) IS_BLANK_AT(parser,0)
-
-/*
- * Check if the character at the specified position is a line break.
- */
-
-#define IS_BREAK_AT(parser,offset) \
- (CHECK_AT(parser,'\r',(offset)) /* CR (#xD)*/ \
- || CHECK_AT(parser,'\n',(offset)) /* LF (#xA) */ \
- || (CHECK_AT(parser,'\xC2',(offset)) \
- && CHECK_AT(parser,'\x85',(offset+1))) /* NEL (#x85) */ \
- || (CHECK_AT(parser,'\xE2',(offset)) \
- && CHECK_AT(parser,'\x80',(offset+1)) \
- && CHECK_AT(parser,'\xA8',(offset+2))) /* LS (#x2028) */ \
- || (CHECK_AT(parser,'\xE2',(offset)) \
- && CHECK_AT(parser,'\x80',(offset+1)) \
- && CHECK_AT(parser,'\xA9',(offset+2)))) /* LS (#x2029) */
-
-#define IS_BREAK(parser) IS_BREAK_AT(parser,0)
-
-/*
- * Check if the character is a line break or NUL.
+ * Advance the buffer pointer.
*/
-#define IS_BREAKZ_AT(parser,offset) \
- (IS_BREAK_AT(parser,(offset)) || IS_Z_AT(parser,(offset)))
-
-#define IS_BREAKZ(parser) IS_BREAKZ_AT(parser,0)
+#define SKIP(parser) \
+ (parser->mark.index ++, \
+ parser->mark.column ++, \
+ parser->unread --, \
+ parser->buffer.pointer += WIDTH(parser->buffer))
+
+#define SKIP_LINE(parser) \
+ (IS_CRLF(parser->buffer) ? \
+ (parser->mark.index += 2, \
+ parser->mark.column = 0, \
+ parser->mark.line ++, \
+ parser->unread -= 2, \
+ parser->buffer.pointer += 2) : \
+ IS_BREAK(parser->buffer) ? \
+ (parser->mark.index ++, \
+ parser->mark.column = 0, \
+ parser->mark.line ++, \
+ parser->unread --, \
+ parser->buffer.pointer += WIDTH(parser->buffer)) : 0)
/*
- * Check if the character is a line break, space, or NUL.
+ * Copy a character to a string buffer and advance pointers.
*/
-#define IS_SPACEZ_AT(parser,offset) \
- (IS_SPACE_AT(parser,(offset)) || IS_BREAKZ_AT(parser,(offset)))
-
-#define IS_SPACEZ(parser) IS_SPACEZ_AT(parser,0)
+#define READ(parser,string) \
+ (STRING_EXTEND(parser,string) ? \
+ (COPY(string,parser->buffer), \
+ parser->mark.index ++, \
+ parser->mark.column ++, \
+ parser->unread --, \
+ 1) : 0)
/*
- * Check if the character is a line break, space, tab, or NUL.
+ * Copy a line break character to a string buffer and advance pointers.
*/
-#define IS_BLANKZ_AT(parser,offset) \
- (IS_BLANK_AT(parser,(offset)) || IS_BREAKZ_AT(parser,(offset)))
-
-#define IS_BLANKZ(parser) IS_BLANKZ_AT(parser,0)
+#define READ_LINE(parser,string) \
+ (STRING_EXTEND(parser,string) ? \
+ (((CHECK_AT(parser->buffer,'\r',0) \
+ && CHECK_AT(parser->buffer,'\n',1)) ? /* CR LF -> LF */ \
+ (*((string).pointer++) = (yaml_char_t) '\n', \
+ parser->buffer.pointer += 2, \
+ parser->mark.index += 2, \
+ parser->mark.column = 0, \
+ parser->mark.line ++, \
+ parser->unread -= 2) : \
+ (CHECK_AT(parser->buffer,'\r',0) \
+ || CHECK_AT(parser->buffer,'\n',0)) ? /* CR|LF -> LF */ \
+ (*((string).pointer++) = (yaml_char_t) '\n', \
+ parser->buffer.pointer ++, \
+ parser->mark.index ++, \
+ parser->mark.column = 0, \
+ parser->mark.line ++, \
+ parser->unread --) : \
+ (CHECK_AT(parser->buffer,'\xC2',0) \
+ && CHECK_AT(parser->buffer,'\x85',1)) ? /* NEL -> LF */ \
+ (*((string).pointer++) = (yaml_char_t) '\n', \
+ parser->buffer.pointer += 2, \
+ parser->mark.index ++, \
+ parser->mark.column = 0, \
+ parser->mark.line ++, \
+ parser->unread --) : \
+ (CHECK_AT(parser->buffer,'\xE2',0) && \
+ CHECK_AT(parser->buffer,'\x80',1) && \
+ (CHECK_AT(parser->buffer,'\xA8',2) || \
+ CHECK_AT(parser->buffer,'\xA9',2))) ? /* LS|PS -> LS|PS */ \
+ (*((string).pointer++) = *(parser->buffer.pointer++), \
+ *((string).pointer++) = *(parser->buffer.pointer++), \
+ *((string).pointer++) = *(parser->buffer.pointer++), \
+ parser->mark.index ++, \
+ parser->mark.column = 0, \
+ parser->mark.line ++, \
+ parser->unread --) : 0), \
+ 1) : 0)
/*
* Public API declarations.
*/
-YAML_DECLARE(yaml_token_t *)
-yaml_parser_get_token(yaml_parser_t *parser);
-
-YAML_DECLARE(yaml_token_t *)
-yaml_parser_peek_token(yaml_parser_t *parser);
+YAML_DECLARE(int)
+yaml_parser_scan(yaml_parser_t *parser, yaml_token_t *token);
/*
* Error handling.
yaml_parser_set_scanner_error(yaml_parser_t *parser, const char *context,
yaml_mark_t context_mark, const char *problem);
-static yaml_mark_t
-yaml_parser_get_mark(yaml_parser_t *parser);
-
/*
* High-level token API.
*/
-static int
+YAML_DECLARE(int)
yaml_parser_fetch_more_tokens(yaml_parser_t *parser);
static int
static int
yaml_parser_remove_simple_key(yaml_parser_t *parser);
+static int
+yaml_parser_increase_flow_level(yaml_parser_t *parser);
+
+static int
+yaml_parser_decrease_flow_level(yaml_parser_t *parser);
+
/*
* Indentation treatment.
*/
static int
-yaml_parser_roll_indent(yaml_parser_t *parser, int column);
+yaml_parser_roll_indent(yaml_parser_t *parser, ptrdiff_t column,
+ ptrdiff_t number, yaml_token_type_t type, yaml_mark_t mark);
static int
-yaml_parser_unroll_indent(yaml_parser_t *parser, int column);
+yaml_parser_unroll_indent(yaml_parser_t *parser, ptrdiff_t column);
/*
* Token fetchers.
static int
yaml_parser_fetch_directive(yaml_parser_t *parser);
-static int
-yaml_parser_fetch_document_start(yaml_parser_t *parser);
-
-static int
-yaml_parser_fetch_document_end(yaml_parser_t *parser);
-
static int
yaml_parser_fetch_document_indicator(yaml_parser_t *parser,
yaml_token_type_t type);
-static int
-yaml_parser_fetch_flow_sequence_start(yaml_parser_t *parser);
-
-static int
-yaml_parser_fetch_flow_mapping_start(yaml_parser_t *parser);
-
static int
yaml_parser_fetch_flow_collection_start(yaml_parser_t *parser,
yaml_token_type_t type);
-static int
-yaml_parser_fetch_flow_sequence_end(yaml_parser_t *parser);
-
-static int
-yaml_parser_fetch_flow_mapping_end(yaml_parser_t *parser);
-
static int
yaml_parser_fetch_flow_collection_end(yaml_parser_t *parser,
yaml_token_type_t type);
yaml_parser_fetch_value(yaml_parser_t *parser);
static int
-yaml_parser_fetch_alias(yaml_parser_t *parser);
-
-static int
-yaml_parser_fetch_anchor(yaml_parser_t *parser);
+yaml_parser_fetch_anchor(yaml_parser_t *parser, yaml_token_type_t type);
static int
yaml_parser_fetch_tag(yaml_parser_t *parser);
static int
yaml_parser_scan_to_next_token(yaml_parser_t *parser);
-static yaml_token_t *
-yaml_parser_scan_directive(yaml_parser_t *parser);
+static int
+yaml_parser_scan_directive(yaml_parser_t *parser, yaml_token_t *token);
static int
yaml_parser_scan_directive_name(yaml_parser_t *parser,
yaml_mark_t start_mark, yaml_char_t **name);
static int
-yaml_parser_scan_yaml_directive_value(yaml_parser_t *parser,
+yaml_parser_scan_version_directive_value(yaml_parser_t *parser,
yaml_mark_t start_mark, int *major, int *minor);
static int
-yaml_parser_scan_yaml_directive_number(yaml_parser_t *parser,
+yaml_parser_scan_version_directive_number(yaml_parser_t *parser,
yaml_mark_t start_mark, int *number);
static int
yaml_parser_scan_tag_directive_value(yaml_parser_t *parser,
- yaml_char_t **handle, yaml_char_t **prefix);
+ yaml_mark_t mark, yaml_char_t **handle, yaml_char_t **prefix);
-static yaml_token_t *
-yaml_parser_scan_anchor(yaml_parser_t *parser,
+static int
+yaml_parser_scan_anchor(yaml_parser_t *parser, yaml_token_t *token,
yaml_token_type_t type);
-static yaml_token_t *
-yaml_parser_scan_tag(yaml_parser_t *parser);
+static int
+yaml_parser_scan_tag(yaml_parser_t *parser, yaml_token_t *token);
static int
yaml_parser_scan_tag_handle(yaml_parser_t *parser, int directive,
static int
yaml_parser_scan_tag_uri(yaml_parser_t *parser, int directive,
- yaml_mark_t start_mark, yaml_char_t **url);
+ yaml_char_t *head, yaml_mark_t start_mark, yaml_char_t **uri);
+
+static int
+yaml_parser_scan_uri_escapes(yaml_parser_t *parser, int directive,
+ yaml_mark_t start_mark, yaml_string_t *string);
-static yaml_token_t *
-yaml_parser_scan_block_scalar(yaml_parser_t *parser, int literal);
+static int
+yaml_parser_scan_block_scalar(yaml_parser_t *parser, yaml_token_t *token,
+ int literal);
static int
-yaml_parser_scan_block_scalar_indicators(yaml_parser_t *parser,
- yaml_mark_t start_mark, int *chomping, int *increment);
+yaml_parser_scan_block_scalar_breaks(yaml_parser_t *parser,
+ int *indent, yaml_string_t *breaks,
+ yaml_mark_t start_mark, yaml_mark_t *end_mark);
-static yaml_token_t *
-yaml_parser_scan_flow_scalar(yaml_parser_t *parser, int single);
+static int
+yaml_parser_scan_flow_scalar(yaml_parser_t *parser, yaml_token_t *token,
+ int single);
-static yaml_token_t *
-yaml_parser_scan_plain_scalar(yaml_parser_t *parser);
+static int
+yaml_parser_scan_plain_scalar(yaml_parser_t *parser, yaml_token_t *token);
/*
- * Get the next token and remove it from the tokens queue.
+ * Get the next token.
*/
-YAML_DECLARE(yaml_token_t *)
-yaml_parser_get_token(yaml_parser_t *parser)
+YAML_DECLARE(int)
+yaml_parser_scan(yaml_parser_t *parser, yaml_token_t *token)
{
- yaml_token_t *token;
-
assert(parser); /* Non-NULL parser object is expected. */
- assert(!parser->stream_end_produced); /* No tokens after STREAM-END. */
-
- /* Ensure that the tokens queue contains enough tokens. */
-
- if (!yaml_parser_fetch_more_tokens(parser)) return NULL;
-
- /* Fetch the next token from the queue. */
-
- token = parser->tokens[parser->tokens_head];
-
- /* Move the queue head. */
-
- parser->tokens[parser->tokens_head++] = NULL;
- if (parser->tokens_head == parser->tokens_size)
- parser->tokens_head = 0;
+ assert(token); /* Non-NULL token object is expected. */
- parser->tokens_parsed++;
+ /* Erase the token object. */
- return token;
-}
+ memset(token, 0, sizeof(yaml_token_t));
-/*
- * Get the next token, but don't remove it from the queue.
- */
+ /* No tokens after STREAM-END or error. */
-YAML_DECLARE(yaml_token_t *)
-yaml_parser_peek_token(yaml_parser_t *parser)
-{
- assert(parser); /* Non-NULL parser object is expected. */
- assert(!parser->stream_end_produced); /* No tokens after STREAM-END. */
+ if (parser->stream_end_produced || parser->error) {
+ return 1;
+ }
/* Ensure that the tokens queue contains enough tokens. */
- if (!yaml_parser_fetch_more_tokens(parser)) return NULL;
+ if (!parser->token_available) {
+ if (!yaml_parser_fetch_more_tokens(parser))
+ return 0;
+ }
/* Fetch the next token from the queue. */
- return parser->tokens[parser->tokens_head];
+ *token = DEQUEUE(parser, parser->tokens);
+ parser->token_available = 0;
+ parser->tokens_parsed ++;
+
+ if (token->type == YAML_STREAM_END_TOKEN) {
+ parser->stream_end_produced = 1;
+ }
+
+ return 1;
}
/*
parser->context = context;
parser->context_mark = context_mark;
parser->problem = problem;
- parser->problem_mark = yaml_parser_get_mark(parser);
-}
-
-/*
- * Get the mark for the current buffer position.
- */
+ parser->problem_mark = parser->mark;
-static yaml_mark_t
-yaml_parser_get_mark(yaml_parser_t *parser)
-{
- yaml_mark_t mark = { parser->index, parser->line, parser->column };
-
- return mark;
+ return 0;
}
-
/*
* Ensure that the tokens queue contains at least one token which can be
* returned to the Parser.
*/
-static int
+YAML_DECLARE(int)
yaml_parser_fetch_more_tokens(yaml_parser_t *parser)
{
int need_more_tokens;
- int k;
/* While we need more tokens to fetch, do it. */
need_more_tokens = 0;
- if (parser->tokens_head == parser->tokens_tail)
+ if (parser->tokens.head == parser->tokens.tail)
{
/* Queue is empty. */
}
else
{
+ yaml_simple_key_t *simple_key;
+
/* Check if any potential simple key may occupy the head position. */
- for (k = 0; k <= parser->flow_level; k++) {
- yaml_simple_key_t *simple_key = parser->simple_keys[k];
- if (simple_key
- && (simple_key->token_number == parser->tokens_parsed)) {
+ if (!yaml_parser_stale_simple_keys(parser))
+ return 0;
+
+ for (simple_key = parser->simple_keys.start;
+ simple_key != parser->simple_keys.top; simple_key++) {
+ if (simple_key->possible
+ && simple_key->token_number == parser->tokens_parsed) {
need_more_tokens = 1;
break;
}
return 0;
}
+ parser->token_available = 1;
+
return 1;
}
{
/* Ensure that the buffer is initialized. */
- if (!UPDATE(parser, 1))
+ if (!CACHE(parser, 1))
return 0;
/* Check if we just started scanning. Fetch STREAM-START then. */
if (!yaml_parser_scan_to_next_token(parser))
return 0;
+ /* Remove obsolete potential simple keys. */
+
+ if (!yaml_parser_stale_simple_keys(parser))
+ return 0;
+
/* Check the indentation level against the current column. */
- if (!yaml_parser_unroll_indent(parser, parser->column))
+ if (!yaml_parser_unroll_indent(parser, parser->mark.column))
return 0;
/*
* of the longest indicators ('--- ' and '... ').
*/
- if (!UPDATE(parser, 4))
+ if (!CACHE(parser, 4))
return 0;
/* Is it the end of the stream? */
- if (IS_Z(parser))
+ if (IS_Z(parser->buffer))
return yaml_parser_fetch_stream_end(parser);
/* Is it a directive? */
- if (parser->column == 0 && CHECK(parser, '%'))
+ if (parser->mark.column == 0 && CHECK(parser->buffer, '%'))
return yaml_parser_fetch_directive(parser);
/* Is it the document start indicator? */
- if (parser->column == 0
- && CHECK_AT(parser, '-', 0)
- && CHECK_AT(parser, '-', 1)
- && CHECK_AT(parser, '-', 2)
- && IS_BLANKZ_AT(parser, 3))
- return yaml_parser_fetch_document_start(parser);
+ if (parser->mark.column == 0
+ && CHECK_AT(parser->buffer, '-', 0)
+ && CHECK_AT(parser->buffer, '-', 1)
+ && CHECK_AT(parser->buffer, '-', 2)
+ && IS_BLANKZ_AT(parser->buffer, 3))
+ return yaml_parser_fetch_document_indicator(parser,
+ YAML_DOCUMENT_START_TOKEN);
/* Is it the document end indicator? */
- if (parser->column == 0
- && CHECK_AT(parser, '.', 0)
- && CHECK_AT(parser, '.', 1)
- && CHECK_AT(parser, '.', 2)
- && IS_BLANKZ_AT(parser, 3))
- return yaml_parser_fetch_document_start(parser);
+ if (parser->mark.column == 0
+ && CHECK_AT(parser->buffer, '.', 0)
+ && CHECK_AT(parser->buffer, '.', 1)
+ && CHECK_AT(parser->buffer, '.', 2)
+ && IS_BLANKZ_AT(parser->buffer, 3))
+ return yaml_parser_fetch_document_indicator(parser,
+ YAML_DOCUMENT_END_TOKEN);
/* Is it the flow sequence start indicator? */
- if (CHECK(parser, '['))
- return yaml_parser_fetch_flow_sequence_start(parser);
+ if (CHECK(parser->buffer, '['))
+ return yaml_parser_fetch_flow_collection_start(parser,
+ YAML_FLOW_SEQUENCE_START_TOKEN);
/* Is it the flow mapping start indicator? */
- if (CHECK(parser, '{'))
- return yaml_parser_fetch_flow_mapping_start(parser);
+ if (CHECK(parser->buffer, '{'))
+ return yaml_parser_fetch_flow_collection_start(parser,
+ YAML_FLOW_MAPPING_START_TOKEN);
/* Is it the flow sequence end indicator? */
- if (CHECK(parser, ']'))
- return yaml_parser_fetch_flow_sequence_end(parser);
+ if (CHECK(parser->buffer, ']'))
+ return yaml_parser_fetch_flow_collection_end(parser,
+ YAML_FLOW_SEQUENCE_END_TOKEN);
/* Is it the flow mapping end indicator? */
- if (CHECK(parser, '}'))
- return yaml_parser_fetch_flow_mapping_end(parser);
+ if (CHECK(parser->buffer, '}'))
+ return yaml_parser_fetch_flow_collection_end(parser,
+ YAML_FLOW_MAPPING_END_TOKEN);
/* Is it the flow entry indicator? */
- if (CHECK(parser, ','))
+ if (CHECK(parser->buffer, ','))
return yaml_parser_fetch_flow_entry(parser);
/* Is it the block entry indicator? */
- if (CHECK(parser, '-') && IS_BLANKZ_AT(parser, 1))
+ if (CHECK(parser->buffer, '-') && IS_BLANKZ_AT(parser->buffer, 1))
return yaml_parser_fetch_block_entry(parser);
/* Is it the key indicator? */
- if (CHECK(parser, '?') && (!parser->flow_level || IS_BLANKZ_AT(parser, 1)))
+ if (CHECK(parser->buffer, '?')
+ && (parser->flow_level || IS_BLANKZ_AT(parser->buffer, 1)))
return yaml_parser_fetch_key(parser);
/* Is it the value indicator? */
- if (CHECK(parser, ':') && (!parser->flow_level || IS_BLANKZ_AT(parser, 1)))
+ if (CHECK(parser->buffer, ':')
+ && (parser->flow_level || IS_BLANKZ_AT(parser->buffer, 1)))
return yaml_parser_fetch_value(parser);
/* Is it an alias? */
- if (CHECK(parser, '*'))
- return yaml_parser_fetch_alias(parser);
+ if (CHECK(parser->buffer, '*'))
+ return yaml_parser_fetch_anchor(parser, YAML_ALIAS_TOKEN);
/* Is it an anchor? */
- if (CHECK(parser, '&'))
- return yaml_parser_fetch_anchor(parser);
+ if (CHECK(parser->buffer, '&'))
+ return yaml_parser_fetch_anchor(parser, YAML_ANCHOR_TOKEN);
/* Is it a tag? */
- if (CHECK(parser, '!'))
+ if (CHECK(parser->buffer, '!'))
return yaml_parser_fetch_tag(parser);
/* Is it a literal scalar? */
- if (CHECK(parser, '|') && !parser->flow_level)
+ if (CHECK(parser->buffer, '|') && !parser->flow_level)
return yaml_parser_fetch_block_scalar(parser, 1);
/* Is it a folded scalar? */
- if (CHECK(parser, '>') && !parser->flow_level)
+ if (CHECK(parser->buffer, '>') && !parser->flow_level)
return yaml_parser_fetch_block_scalar(parser, 0);
/* Is it a single-quoted scalar? */
- if (CHECK(parser, '\''))
+ if (CHECK(parser->buffer, '\''))
return yaml_parser_fetch_flow_scalar(parser, 1);
/* Is it a double-quoted scalar? */
- if (CHECK(parser, '"'))
+ if (CHECK(parser->buffer, '"'))
return yaml_parser_fetch_flow_scalar(parser, 0);
/*
* '#', '&', '*', '!', '|', '>', '\'', '\"',
* '%', '@', '`'.
*
- * In the block context, it may also start with the characters
+ * In the block context (and, for the '-' indicator, in the flow context
+ * too), it may also start with the characters
*
* '-', '?', ':'
*
* The last rule is more restrictive than the specification requires.
*/
- if (!(IS_BLANKZ(parser) || CHECK(parser, '-') || CHECK(parser, '?')
- || CHECK(parser, ':') || CHECK(parser, ',') || CHECK(parser, '[')
- || CHECK(parser, ']') || CHECK(parser, '{') || CHECK(parser, '}')
- || CHECK(parser, '#') || CHECK(parser, '&') || CHECK(parser, '*')
- || CHECK(parser, '!') || CHECK(parser, '|') || CHECK(parser, '>')
- || CHECK(parser, '\'') || CHECK(parser, '"') || CHECK(parser, '%')
- || CHECK(parser, '@') || CHECK(parser, '`')) ||
+ if (!(IS_BLANKZ(parser->buffer) || CHECK(parser->buffer, '-')
+ || CHECK(parser->buffer, '?') || CHECK(parser->buffer, ':')
+ || CHECK(parser->buffer, ',') || CHECK(parser->buffer, '[')
+ || CHECK(parser->buffer, ']') || CHECK(parser->buffer, '{')
+ || CHECK(parser->buffer, '}') || CHECK(parser->buffer, '#')
+ || CHECK(parser->buffer, '&') || CHECK(parser->buffer, '*')
+ || CHECK(parser->buffer, '!') || CHECK(parser->buffer, '|')
+ || CHECK(parser->buffer, '>') || CHECK(parser->buffer, '\'')
+ || CHECK(parser->buffer, '"') || CHECK(parser->buffer, '%')
+ || CHECK(parser->buffer, '@') || CHECK(parser->buffer, '`')) ||
+ (CHECK(parser->buffer, '-') && !IS_BLANK_AT(parser->buffer, 1)) ||
(!parser->flow_level &&
- (CHECK(parser, '-') || CHECK(parser, '?') || CHECK(parser, ':')) &&
- IS_BLANKZ_AT(parser, 1)))
+ (CHECK(parser->buffer, '?') || CHECK(parser->buffer, ':'))
+ && !IS_BLANKZ_AT(parser->buffer, 1)))
return yaml_parser_fetch_plain_scalar(parser);
/*
* If we don't determine the token type so far, it is an error.
*/
- return yaml_parser_set_scanner_error(parser, "while scanning for the next token",
- yaml_parser_get_mark(parser), "found character that cannot start any token");
+ return yaml_parser_set_scanner_error(parser,
+ "while scanning for the next token", parser->mark,
+ "found character that cannot start any token");
+}
+
+/*
+ * Check the list of potential simple keys and remove the positions that
+ * cannot contain simple keys anymore.
+ */
+
+static int
+yaml_parser_stale_simple_keys(yaml_parser_t *parser)
+{
+ yaml_simple_key_t *simple_key;
+
+ /* Check for a potential simple key for each flow level. */
+
+ for (simple_key = parser->simple_keys.start;
+ simple_key != parser->simple_keys.top; simple_key ++)
+ {
+ /*
+ * The specification requires that a simple key
+ *
+ * - is limited to a single line,
+ * - is shorter than 1024 characters.
+ */
+
+ if (simple_key->possible
+ && (simple_key->mark.line < parser->mark.line
+ || simple_key->mark.index+1024 < parser->mark.index)) {
+
+ /* Check if the potential simple key to be removed is required. */
+
+ if (simple_key->required) {
+ return yaml_parser_set_scanner_error(parser,
+ "while scanning a simple key", simple_key->mark,
+ "could not find expected ':'");
+ }
+
+ simple_key->possible = 0;
+ }
+ }
+
+ return 1;
+}
+
+/*
+ * Check if a simple key may start at the current position and add it if
+ * needed.
+ */
+
+static int
+yaml_parser_save_simple_key(yaml_parser_t *parser)
+{
+ /*
+ * A simple key is required at the current position if the scanner is in
+ * the block context and the current column coincides with the indentation
+ * level.
+ */
+
+ int required = (!parser->flow_level
+ && parser->indent == (ptrdiff_t)parser->mark.column);
+
+ /*
+ * If the current position may start a simple key, save it.
+ */
+
+ if (parser->simple_key_allowed)
+ {
+ yaml_simple_key_t simple_key;
+ simple_key.possible = 1;
+ simple_key.required = required;
+ simple_key.token_number =
+ parser->tokens_parsed + (parser->tokens.tail - parser->tokens.head);
+ simple_key.mark = parser->mark;
+
+ if (!yaml_parser_remove_simple_key(parser)) return 0;
+
+ *(parser->simple_keys.top-1) = simple_key;
+ }
+
+ return 1;
+}
+
+/*
+ * Remove a potential simple key at the current flow level.
+ */
+
+static int
+yaml_parser_remove_simple_key(yaml_parser_t *parser)
+{
+ yaml_simple_key_t *simple_key = parser->simple_keys.top-1;
+
+ if (simple_key->possible)
+ {
+ /* If the key is required, it is an error. */
+
+ if (simple_key->required) {
+ return yaml_parser_set_scanner_error(parser,
+ "while scanning a simple key", simple_key->mark,
+ "could not find expected ':'");
+ }
+ }
+
+ /* Remove the key from the stack. */
+
+ simple_key->possible = 0;
+
+ return 1;
+}
+
+/*
+ * Increase the flow level and resize the simple key list if needed.
+ */
+
+static int
+yaml_parser_increase_flow_level(yaml_parser_t *parser)
+{
+ yaml_simple_key_t empty_simple_key = { 0, 0, 0, { 0, 0, 0 } };
+
+ /* Reset the simple key on the next level. */
+
+ if (!PUSH(parser, parser->simple_keys, empty_simple_key))
+ return 0;
+
+ /* Increase the flow level. */
+
+ if (parser->flow_level == INT_MAX) {
+ parser->error = YAML_MEMORY_ERROR;
+ return 0;
+ }
+
+ parser->flow_level++;
+
+ return 1;
+}
+
+/*
+ * Decrease the flow level.
+ */
+
+static int
+yaml_parser_decrease_flow_level(yaml_parser_t *parser)
+{
+ yaml_simple_key_t dummy_key; /* Used to eliminate a compiler warning. */
+
+ if (parser->flow_level) {
+ parser->flow_level --;
+ dummy_key = POP(parser, parser->simple_keys);
+ }
+
+ return 1;
+}
+
+/*
+ * Push the current indentation level to the stack and set the new level
+ * the current column is greater than the indentation level. In this case,
+ * append or insert the specified token into the token queue.
+ *
+ */
+
+static int
+yaml_parser_roll_indent(yaml_parser_t *parser, ptrdiff_t column,
+ ptrdiff_t number, yaml_token_type_t type, yaml_mark_t mark)
+{
+ yaml_token_t token;
+
+ /* In the flow context, do nothing. */
+
+ if (parser->flow_level)
+ return 1;
+
+ if (parser->indent < column)
+ {
+ /*
+ * Push the current indentation level to the stack and set the new
+ * indentation level.
+ */
+
+ if (!PUSH(parser, parser->indents, parser->indent))
+ return 0;
+
+ if (column > INT_MAX) {
+ parser->error = YAML_MEMORY_ERROR;
+ return 0;
+ }
+
+ parser->indent = column;
+
+ /* Create a token and insert it into the queue. */
+
+ TOKEN_INIT(token, type, mark, mark);
+
+ if (number == -1) {
+ if (!ENQUEUE(parser, parser->tokens, token))
+ return 0;
+ }
+ else {
+ if (!QUEUE_INSERT(parser,
+ parser->tokens, number - parser->tokens_parsed, token))
+ return 0;
+ }
+ }
+
+ return 1;
+}
+
+/*
+ * Pop indentation levels from the indents stack until the current level
+ * becomes less or equal to the column. For each indentation level, append
+ * the BLOCK-END token.
+ */
+
+
+static int
+yaml_parser_unroll_indent(yaml_parser_t *parser, ptrdiff_t column)
+{
+ yaml_token_t token;
+
+ /* In the flow context, do nothing. */
+
+ if (parser->flow_level)
+ return 1;
+
+ /* Loop through the indentation levels in the stack. */
+
+ while (parser->indent > column)
+ {
+ /* Create a token and append it to the queue. */
+
+ TOKEN_INIT(token, YAML_BLOCK_END_TOKEN, parser->mark, parser->mark);
+
+ if (!ENQUEUE(parser, parser->tokens, token))
+ return 0;
+
+ /* Pop the indentation level. */
+
+ parser->indent = POP(parser, parser->indents);
+ }
+
+ return 1;
}
+/*
+ * Initialize the scanner and produce the STREAM-START token.
+ */
+
+static int
+yaml_parser_fetch_stream_start(yaml_parser_t *parser)
+{
+ yaml_simple_key_t simple_key = { 0, 0, 0, { 0, 0, 0 } };
+ yaml_token_t token;
+
+ /* Set the initial indentation. */
+
+ parser->indent = -1;
+
+ /* Initialize the simple key stack. */
+
+ if (!PUSH(parser, parser->simple_keys, simple_key))
+ return 0;
+
+ /* A simple key is allowed at the beginning of the stream. */
+
+ parser->simple_key_allowed = 1;
+
+ /* We have started. */
+
+ parser->stream_start_produced = 1;
+
+ /* Create the STREAM-START token and append it to the queue. */
+
+ STREAM_START_TOKEN_INIT(token, parser->encoding,
+ parser->mark, parser->mark);
+
+ if (!ENQUEUE(parser, parser->tokens, token))
+ return 0;
+
+ return 1;
+}
+
+/*
+ * Produce the STREAM-END token and shut down the scanner.
+ */
+
+static int
+yaml_parser_fetch_stream_end(yaml_parser_t *parser)
+{
+ yaml_token_t token;
+
+ /* Force new line. */
+
+ if (parser->mark.column != 0) {
+ parser->mark.column = 0;
+ parser->mark.line ++;
+ }
+
+ /* Reset the indentation level. */
+
+ if (!yaml_parser_unroll_indent(parser, -1))
+ return 0;
+
+ /* Reset simple keys. */
+
+ if (!yaml_parser_remove_simple_key(parser))
+ return 0;
+
+ parser->simple_key_allowed = 0;
+
+ /* Create the STREAM-END token and append it to the queue. */
+
+ STREAM_END_TOKEN_INIT(token, parser->mark, parser->mark);
+
+ if (!ENQUEUE(parser, parser->tokens, token))
+ return 0;
+
+ return 1;
+}
+
+/*
+ * Produce a VERSION-DIRECTIVE or TAG-DIRECTIVE token.
+ */
+
+static int
+yaml_parser_fetch_directive(yaml_parser_t *parser)
+{
+ yaml_token_t token;
+
+ /* Reset the indentation level. */
+
+ if (!yaml_parser_unroll_indent(parser, -1))
+ return 0;
+
+ /* Reset simple keys. */
+
+ if (!yaml_parser_remove_simple_key(parser))
+ return 0;
+
+ parser->simple_key_allowed = 0;
+
+ /* Create the YAML-DIRECTIVE or TAG-DIRECTIVE token. */
+
+ if (!yaml_parser_scan_directive(parser, &token))
+ return 0;
+
+ /* Append the token to the queue. */
+
+ if (!ENQUEUE(parser, parser->tokens, token)) {
+ yaml_token_delete(&token);
+ return 0;
+ }
+
+ return 1;
+}
+
+/*
+ * Produce the DOCUMENT-START or DOCUMENT-END token.
+ */
+
+static int
+yaml_parser_fetch_document_indicator(yaml_parser_t *parser,
+ yaml_token_type_t type)
+{
+ yaml_mark_t start_mark, end_mark;
+ yaml_token_t token;
+
+ /* Reset the indentation level. */
+
+ if (!yaml_parser_unroll_indent(parser, -1))
+ return 0;
+
+ /* Reset simple keys. */
+
+ if (!yaml_parser_remove_simple_key(parser))
+ return 0;
+
+ parser->simple_key_allowed = 0;
+
+ /* Consume the token. */
+
+ start_mark = parser->mark;
+
+ SKIP(parser);
+ SKIP(parser);
+ SKIP(parser);
+
+ end_mark = parser->mark;
+
+ /* Create the DOCUMENT-START or DOCUMENT-END token. */
+
+ TOKEN_INIT(token, type, start_mark, end_mark);
+
+ /* Append the token to the queue. */
+
+ if (!ENQUEUE(parser, parser->tokens, token))
+ return 0;
+
+ return 1;
+}
+
+/*
+ * Produce the FLOW-SEQUENCE-START or FLOW-MAPPING-START token.
+ */
+
+static int
+yaml_parser_fetch_flow_collection_start(yaml_parser_t *parser,
+ yaml_token_type_t type)
+{
+ yaml_mark_t start_mark, end_mark;
+ yaml_token_t token;
+
+ /* The indicators '[' and '{' may start a simple key. */
+
+ if (!yaml_parser_save_simple_key(parser))
+ return 0;
+
+ /* Increase the flow level. */
+
+ if (!yaml_parser_increase_flow_level(parser))
+ return 0;
+
+ /* A simple key may follow the indicators '[' and '{'. */
+
+ parser->simple_key_allowed = 1;
+
+ /* Consume the token. */
+
+ start_mark = parser->mark;
+ SKIP(parser);
+ end_mark = parser->mark;
+
+ /* Create the FLOW-SEQUENCE-START of FLOW-MAPPING-START token. */
+
+ TOKEN_INIT(token, type, start_mark, end_mark);
+
+ /* Append the token to the queue. */
+
+ if (!ENQUEUE(parser, parser->tokens, token))
+ return 0;
+
+ return 1;
+}
+
+/*
+ * Produce the FLOW-SEQUENCE-END or FLOW-MAPPING-END token.
+ */
+
+static int
+yaml_parser_fetch_flow_collection_end(yaml_parser_t *parser,
+ yaml_token_type_t type)
+{
+ yaml_mark_t start_mark, end_mark;
+ yaml_token_t token;
+
+ /* Reset any potential simple key on the current flow level. */
+
+ if (!yaml_parser_remove_simple_key(parser))
+ return 0;
+
+ /* Decrease the flow level. */
+
+ if (!yaml_parser_decrease_flow_level(parser))
+ return 0;
+
+ /* No simple keys after the indicators ']' and '}'. */
+
+ parser->simple_key_allowed = 0;
+
+ /* Consume the token. */
+
+ start_mark = parser->mark;
+ SKIP(parser);
+ end_mark = parser->mark;
+
+ /* Create the FLOW-SEQUENCE-END of FLOW-MAPPING-END token. */
+
+ TOKEN_INIT(token, type, start_mark, end_mark);
+
+ /* Append the token to the queue. */
+
+ if (!ENQUEUE(parser, parser->tokens, token))
+ return 0;
+
+ return 1;
+}
+
+/*
+ * Produce the FLOW-ENTRY token.
+ */
+
+static int
+yaml_parser_fetch_flow_entry(yaml_parser_t *parser)
+{
+ yaml_mark_t start_mark, end_mark;
+ yaml_token_t token;
+
+ /* Reset any potential simple keys on the current flow level. */
+
+ if (!yaml_parser_remove_simple_key(parser))
+ return 0;
+
+ /* Simple keys are allowed after ','. */
+
+ parser->simple_key_allowed = 1;
+
+ /* Consume the token. */
+
+ start_mark = parser->mark;
+ SKIP(parser);
+ end_mark = parser->mark;
+
+ /* Create the FLOW-ENTRY token and append it to the queue. */
+
+ TOKEN_INIT(token, YAML_FLOW_ENTRY_TOKEN, start_mark, end_mark);
+
+ if (!ENQUEUE(parser, parser->tokens, token))
+ return 0;
+
+ return 1;
+}
+
+/*
+ * Produce the BLOCK-ENTRY token.
+ */
+
+static int
+yaml_parser_fetch_block_entry(yaml_parser_t *parser)
+{
+ yaml_mark_t start_mark, end_mark;
+ yaml_token_t token;
+
+ /* Check if the scanner is in the block context. */
+
+ if (!parser->flow_level)
+ {
+ /* Check if we are allowed to start a new entry. */
+
+ if (!parser->simple_key_allowed) {
+ return yaml_parser_set_scanner_error(parser, NULL, parser->mark,
+ "block sequence entries are not allowed in this context");
+ }
+
+ /* Add the BLOCK-SEQUENCE-START token if needed. */
+
+ if (!yaml_parser_roll_indent(parser, parser->mark.column, -1,
+ YAML_BLOCK_SEQUENCE_START_TOKEN, parser->mark))
+ return 0;
+ }
+ else
+ {
+ /*
+ * It is an error for the '-' indicator to occur in the flow context,
+ * but we let the Parser detect and report about it because the Parser
+ * is able to point to the context.
+ */
+ }
+
+ /* Reset any potential simple keys on the current flow level. */
+
+ if (!yaml_parser_remove_simple_key(parser))
+ return 0;
+
+ /* Simple keys are allowed after '-'. */
+
+ parser->simple_key_allowed = 1;
+
+ /* Consume the token. */
+
+ start_mark = parser->mark;
+ SKIP(parser);
+ end_mark = parser->mark;
+
+ /* Create the BLOCK-ENTRY token and append it to the queue. */
+
+ TOKEN_INIT(token, YAML_BLOCK_ENTRY_TOKEN, start_mark, end_mark);
+
+ if (!ENQUEUE(parser, parser->tokens, token))
+ return 0;
+
+ return 1;
+}
+
+/*
+ * Produce the KEY token.
+ */
+
+static int
+yaml_parser_fetch_key(yaml_parser_t *parser)
+{
+ yaml_mark_t start_mark, end_mark;
+ yaml_token_t token;
+
+ /* In the block context, additional checks are required. */
+
+ if (!parser->flow_level)
+ {
+ /* Check if we are allowed to start a new key (not nessesary simple). */
+
+ if (!parser->simple_key_allowed) {
+ return yaml_parser_set_scanner_error(parser, NULL, parser->mark,
+ "mapping keys are not allowed in this context");
+ }
+
+ /* Add the BLOCK-MAPPING-START token if needed. */
+
+ if (!yaml_parser_roll_indent(parser, parser->mark.column, -1,
+ YAML_BLOCK_MAPPING_START_TOKEN, parser->mark))
+ return 0;
+ }
+
+ /* Reset any potential simple keys on the current flow level. */
+
+ if (!yaml_parser_remove_simple_key(parser))
+ return 0;
+
+ /* Simple keys are allowed after '?' in the block context. */
+
+ parser->simple_key_allowed = (!parser->flow_level);
+
+ /* Consume the token. */
+
+ start_mark = parser->mark;
+ SKIP(parser);
+ end_mark = parser->mark;
+
+ /* Create the KEY token and append it to the queue. */
+
+ TOKEN_INIT(token, YAML_KEY_TOKEN, start_mark, end_mark);
+
+ if (!ENQUEUE(parser, parser->tokens, token))
+ return 0;
+
+ return 1;
+}
+
+/*
+ * Produce the VALUE token.
+ */
+
+static int
+yaml_parser_fetch_value(yaml_parser_t *parser)
+{
+ yaml_mark_t start_mark, end_mark;
+ yaml_token_t token;
+ yaml_simple_key_t *simple_key = parser->simple_keys.top-1;
+
+ /* Have we found a simple key? */
+
+ if (simple_key->possible)
+ {
+
+ /* Create the KEY token and insert it into the queue. */
+
+ TOKEN_INIT(token, YAML_KEY_TOKEN, simple_key->mark, simple_key->mark);
+
+ if (!QUEUE_INSERT(parser, parser->tokens,
+ simple_key->token_number - parser->tokens_parsed, token))
+ return 0;
+
+ /* In the block context, we may need to add the BLOCK-MAPPING-START token. */
+
+ if (!yaml_parser_roll_indent(parser, simple_key->mark.column,
+ simple_key->token_number,
+ YAML_BLOCK_MAPPING_START_TOKEN, simple_key->mark))
+ return 0;
+
+ /* Remove the simple key. */
+
+ simple_key->possible = 0;
+
+ /* A simple key cannot follow another simple key. */
+
+ parser->simple_key_allowed = 0;
+ }
+ else
+ {
+ /* The ':' indicator follows a complex key. */
+
+ /* In the block context, extra checks are required. */
+
+ if (!parser->flow_level)
+ {
+ /* Check if we are allowed to start a complex value. */
+
+ if (!parser->simple_key_allowed) {
+ return yaml_parser_set_scanner_error(parser, NULL, parser->mark,
+ "mapping values are not allowed in this context");
+ }
+
+ /* Add the BLOCK-MAPPING-START token if needed. */
+
+ if (!yaml_parser_roll_indent(parser, parser->mark.column, -1,
+ YAML_BLOCK_MAPPING_START_TOKEN, parser->mark))
+ return 0;
+ }
+
+ /* Simple keys after ':' are allowed in the block context. */
+
+ parser->simple_key_allowed = (!parser->flow_level);
+ }
+
+ /* Consume the token. */
+
+ start_mark = parser->mark;
+ SKIP(parser);
+ end_mark = parser->mark;
+
+ /* Create the VALUE token and append it to the queue. */
+
+ TOKEN_INIT(token, YAML_VALUE_TOKEN, start_mark, end_mark);
+
+ if (!ENQUEUE(parser, parser->tokens, token))
+ return 0;
+
+ return 1;
+}
+
+/*
+ * Produce the ALIAS or ANCHOR token.
+ */
+
+static int
+yaml_parser_fetch_anchor(yaml_parser_t *parser, yaml_token_type_t type)
+{
+ yaml_token_t token;
+
+ /* An anchor or an alias could be a simple key. */
+
+ if (!yaml_parser_save_simple_key(parser))
+ return 0;
+
+ /* A simple key cannot follow an anchor or an alias. */
+
+ parser->simple_key_allowed = 0;
+
+ /* Create the ALIAS or ANCHOR token and append it to the queue. */
+
+ if (!yaml_parser_scan_anchor(parser, &token, type))
+ return 0;
+
+ if (!ENQUEUE(parser, parser->tokens, token)) {
+ yaml_token_delete(&token);
+ return 0;
+ }
+ return 1;
+}
+
+/*
+ * Produce the TAG token.
+ */
+
+static int
+yaml_parser_fetch_tag(yaml_parser_t *parser)
+{
+ yaml_token_t token;
+
+ /* A tag could be a simple key. */
+
+ if (!yaml_parser_save_simple_key(parser))
+ return 0;
+
+ /* A simple key cannot follow a tag. */
+
+ parser->simple_key_allowed = 0;
+
+ /* Create the TAG token and append it to the queue. */
+
+ if (!yaml_parser_scan_tag(parser, &token))
+ return 0;
+
+ if (!ENQUEUE(parser, parser->tokens, token)) {
+ yaml_token_delete(&token);
+ return 0;
+ }
+
+ return 1;
+}
+
+/*
+ * Produce the SCALAR(...,literal) or SCALAR(...,folded) tokens.
+ */
+
+static int
+yaml_parser_fetch_block_scalar(yaml_parser_t *parser, int literal)
+{
+ yaml_token_t token;
+
+ /* Remove any potential simple keys. */
+
+ if (!yaml_parser_remove_simple_key(parser))
+ return 0;
+
+ /* A simple key may follow a block scalar. */
+
+ parser->simple_key_allowed = 1;
+
+ /* Create the SCALAR token and append it to the queue. */
+
+ if (!yaml_parser_scan_block_scalar(parser, &token, literal))
+ return 0;
+
+ if (!ENQUEUE(parser, parser->tokens, token)) {
+ yaml_token_delete(&token);
+ return 0;
+ }
+
+ return 1;
+}
+
+/*
+ * Produce the SCALAR(...,single-quoted) or SCALAR(...,double-quoted) tokens.
+ */
+
+static int
+yaml_parser_fetch_flow_scalar(yaml_parser_t *parser, int single)
+{
+ yaml_token_t token;
+
+ /* A plain scalar could be a simple key. */
+
+ if (!yaml_parser_save_simple_key(parser))
+ return 0;
+
+ /* A simple key cannot follow a flow scalar. */
+
+ parser->simple_key_allowed = 0;
+
+ /* Create the SCALAR token and append it to the queue. */
+
+ if (!yaml_parser_scan_flow_scalar(parser, &token, single))
+ return 0;
+
+ if (!ENQUEUE(parser, parser->tokens, token)) {
+ yaml_token_delete(&token);
+ return 0;
+ }
+
+ return 1;
+}
+
+/*
+ * Produce the SCALAR(...,plain) token.
+ */
+
+static int
+yaml_parser_fetch_plain_scalar(yaml_parser_t *parser)
+{
+ yaml_token_t token;
+
+ /* A plain scalar could be a simple key. */
+
+ if (!yaml_parser_save_simple_key(parser))
+ return 0;
+
+ /* A simple key cannot follow a flow scalar. */
+
+ parser->simple_key_allowed = 0;
+
+ /* Create the SCALAR token and append it to the queue. */
+
+ if (!yaml_parser_scan_plain_scalar(parser, &token))
+ return 0;
+
+ if (!ENQUEUE(parser, parser->tokens, token)) {
+ yaml_token_delete(&token);
+ return 0;
+ }
+
+ return 1;
+}
+
+/*
+ * Eat whitespaces and comments until the next token is found.
+ */
+
+static int
+yaml_parser_scan_to_next_token(yaml_parser_t *parser)
+{
+ /* Until the next token is not found. */
+
+ while (1)
+ {
+ /* Allow the BOM mark to start a line. */
+
+ if (!CACHE(parser, 1)) return 0;
+
+ if (parser->mark.column == 0 && IS_BOM(parser->buffer))
+ SKIP(parser);
+
+ /*
+ * Eat whitespaces.
+ *
+ * Tabs are allowed:
+ *
+ * - in the flow context;
+ * - in the block context, but not at the beginning of the line or
+ * after '-', '?', or ':' (complex value).
+ */
+
+ if (!CACHE(parser, 1)) return 0;
+
+ while (CHECK(parser->buffer,' ') ||
+ ((parser->flow_level || !parser->simple_key_allowed) &&
+ CHECK(parser->buffer, '\t'))) {
+ SKIP(parser);
+ if (!CACHE(parser, 1)) return 0;
+ }
+
+ /* Eat a comment until a line break. */
+
+ if (CHECK(parser->buffer, '#')) {
+ while (!IS_BREAKZ(parser->buffer)) {
+ SKIP(parser);
+ if (!CACHE(parser, 1)) return 0;
+ }
+ }
+
+ /* If it is a line break, eat it. */
+
+ if (IS_BREAK(parser->buffer))
+ {
+ if (!CACHE(parser, 2)) return 0;
+ SKIP_LINE(parser);
+
+ /* In the block context, a new line may start a simple key. */
+
+ if (!parser->flow_level) {
+ parser->simple_key_allowed = 1;
+ }
+ }
+ else
+ {
+ /* We have found a token. */
+
+ break;
+ }
+ }
+
+ return 1;
+}
+
+/*
+ * Scan a YAML-DIRECTIVE or TAG-DIRECTIVE token.
+ *
+ * Scope:
+ * %YAML 1.1 # a comment \n
+ * ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ * %TAG !yaml! tag:yaml.org,2002: \n
+ * ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ */
+
+int
+yaml_parser_scan_directive(yaml_parser_t *parser, yaml_token_t *token)
+{
+ yaml_mark_t start_mark, end_mark;
+ yaml_char_t *name = NULL;
+ int major, minor;
+ yaml_char_t *handle = NULL, *prefix = NULL;
+
+ /* Eat '%'. */
+
+ start_mark = parser->mark;
+
+ SKIP(parser);
+
+ /* Scan the directive name. */
+
+ if (!yaml_parser_scan_directive_name(parser, start_mark, &name))
+ goto error;
+
+ /* Is it a YAML directive? */
+
+ if (strcmp((char *)name, "YAML") == 0)
+ {
+ /* Scan the VERSION directive value. */
+
+ if (!yaml_parser_scan_version_directive_value(parser, start_mark,
+ &major, &minor))
+ goto error;
+
+ end_mark = parser->mark;
+
+ /* Create a VERSION-DIRECTIVE token. */
+
+ VERSION_DIRECTIVE_TOKEN_INIT(*token, major, minor,
+ start_mark, end_mark);
+ }
+
+ /* Is it a TAG directive? */
+
+ else if (strcmp((char *)name, "TAG") == 0)
+ {
+ /* Scan the TAG directive value. */
+
+ if (!yaml_parser_scan_tag_directive_value(parser, start_mark,
+ &handle, &prefix))
+ goto error;
+
+ end_mark = parser->mark;
+
+ /* Create a TAG-DIRECTIVE token. */
+
+ TAG_DIRECTIVE_TOKEN_INIT(*token, handle, prefix,
+ start_mark, end_mark);
+ }
+
+ /* Unknown directive. */
+
+ else
+ {
+ yaml_parser_set_scanner_error(parser, "while scanning a directive",
+ start_mark, "found unknown directive name");
+ goto error;
+ }
+
+ /* Eat the rest of the line including any comments. */
+
+ if (!CACHE(parser, 1)) goto error;
+
+ while (IS_BLANK(parser->buffer)) {
+ SKIP(parser);
+ if (!CACHE(parser, 1)) goto error;
+ }
+
+ if (CHECK(parser->buffer, '#')) {
+ while (!IS_BREAKZ(parser->buffer)) {
+ SKIP(parser);
+ if (!CACHE(parser, 1)) goto error;
+ }
+ }
+
+ /* Check if we are at the end of the line. */
+
+ if (!IS_BREAKZ(parser->buffer)) {
+ yaml_parser_set_scanner_error(parser, "while scanning a directive",
+ start_mark, "did not find expected comment or line break");
+ goto error;
+ }
+
+ /* Eat a line break. */
+
+ if (IS_BREAK(parser->buffer)) {
+ if (!CACHE(parser, 2)) goto error;
+ SKIP_LINE(parser);
+ }
+
+ yaml_free(name);
+
+ return 1;
+
+error:
+ yaml_free(prefix);
+ yaml_free(handle);
+ yaml_free(name);
+ return 0;
+}
+
+/*
+ * Scan the directive name.
+ *
+ * Scope:
+ * %YAML 1.1 # a comment \n
+ * ^^^^
+ * %TAG !yaml! tag:yaml.org,2002: \n
+ * ^^^
+ */
+
+static int
+yaml_parser_scan_directive_name(yaml_parser_t *parser,
+ yaml_mark_t start_mark, yaml_char_t **name)
+{
+ yaml_string_t string = NULL_STRING;
+
+ if (!STRING_INIT(parser, string, INITIAL_STRING_SIZE)) goto error;
+
+ /* Consume the directive name. */
+
+ if (!CACHE(parser, 1)) goto error;
+
+ while (IS_ALPHA(parser->buffer))
+ {
+ if (!READ(parser, string)) goto error;
+ if (!CACHE(parser, 1)) goto error;
+ }
+
+ /* Check if the name is empty. */
+
+ if (string.start == string.pointer) {
+ yaml_parser_set_scanner_error(parser, "while scanning a directive",
+ start_mark, "could not find expected directive name");
+ goto error;
+ }
+
+ /* Check for an blank character after the name. */
+
+ if (!IS_BLANKZ(parser->buffer)) {
+ yaml_parser_set_scanner_error(parser, "while scanning a directive",
+ start_mark, "found unexpected non-alphabetical character");
+ goto error;
+ }
+
+ *name = string.start;
+
+ return 1;
+
+error:
+ STRING_DEL(parser, string);
+ return 0;
+}
+
+/*
+ * Scan the value of VERSION-DIRECTIVE.
+ *
+ * Scope:
+ * %YAML 1.1 # a comment \n
+ * ^^^^^^
+ */
+
+static int
+yaml_parser_scan_version_directive_value(yaml_parser_t *parser,
+ yaml_mark_t start_mark, int *major, int *minor)
+{
+ /* Eat whitespaces. */
+
+ if (!CACHE(parser, 1)) return 0;
+
+ while (IS_BLANK(parser->buffer)) {
+ SKIP(parser);
+ if (!CACHE(parser, 1)) return 0;
+ }
+
+ /* Consume the major version number. */
+
+ if (!yaml_parser_scan_version_directive_number(parser, start_mark, major))
+ return 0;
+
+ /* Eat '.'. */
+
+ if (!CHECK(parser->buffer, '.')) {
+ return yaml_parser_set_scanner_error(parser, "while scanning a %YAML directive",
+ start_mark, "did not find expected digit or '.' character");
+ }
+
+ SKIP(parser);
+
+ /* Consume the minor version number. */
+
+ if (!yaml_parser_scan_version_directive_number(parser, start_mark, minor))
+ return 0;
+
+ return 1;
+}
+
+#define MAX_NUMBER_LENGTH 9
+
+/*
+ * Scan the version number of VERSION-DIRECTIVE.
+ *
+ * Scope:
+ * %YAML 1.1 # a comment \n
+ * ^
+ * %YAML 1.1 # a comment \n
+ * ^
+ */
+
+static int
+yaml_parser_scan_version_directive_number(yaml_parser_t *parser,
+ yaml_mark_t start_mark, int *number)
+{
+ int value = 0;
+ size_t length = 0;
+
+ /* Repeat while the next character is digit. */
+
+ if (!CACHE(parser, 1)) return 0;
+
+ while (IS_DIGIT(parser->buffer))
+ {
+ /* Check if the number is too long. */
+
+ if (++length > MAX_NUMBER_LENGTH) {
+ return yaml_parser_set_scanner_error(parser, "while scanning a %YAML directive",
+ start_mark, "found extremely long version number");
+ }
+
+ value = value*10 + AS_DIGIT(parser->buffer);
+
+ SKIP(parser);
+
+ if (!CACHE(parser, 1)) return 0;
+ }
+
+ /* Check if the number was present. */
+
+ if (!length) {
+ return yaml_parser_set_scanner_error(parser, "while scanning a %YAML directive",
+ start_mark, "did not find expected version number");
+ }
+
+ *number = value;
+
+ return 1;
+}
+
+/*
+ * Scan the value of a TAG-DIRECTIVE token.
+ *
+ * Scope:
+ * %TAG !yaml! tag:yaml.org,2002: \n
+ * ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ */
+
+static int
+yaml_parser_scan_tag_directive_value(yaml_parser_t *parser,
+ yaml_mark_t start_mark, yaml_char_t **handle, yaml_char_t **prefix)
+{
+ yaml_char_t *handle_value = NULL;
+ yaml_char_t *prefix_value = NULL;
+
+ /* Eat whitespaces. */
+
+ if (!CACHE(parser, 1)) goto error;
+
+ while (IS_BLANK(parser->buffer)) {
+ SKIP(parser);
+ if (!CACHE(parser, 1)) goto error;
+ }
+
+ /* Scan a handle. */
+
+ if (!yaml_parser_scan_tag_handle(parser, 1, start_mark, &handle_value))
+ goto error;
+
+ /* Expect a whitespace. */
+
+ if (!CACHE(parser, 1)) goto error;
+
+ if (!IS_BLANK(parser->buffer)) {
+ yaml_parser_set_scanner_error(parser, "while scanning a %TAG directive",
+ start_mark, "did not find expected whitespace");
+ goto error;
+ }
+
+ /* Eat whitespaces. */
+
+ while (IS_BLANK(parser->buffer)) {
+ SKIP(parser);
+ if (!CACHE(parser, 1)) goto error;
+ }
+
+ /* Scan a prefix. */
+
+ if (!yaml_parser_scan_tag_uri(parser, 1, NULL, start_mark, &prefix_value))
+ goto error;
+
+ /* Expect a whitespace or line break. */
+
+ if (!CACHE(parser, 1)) goto error;
+
+ if (!IS_BLANKZ(parser->buffer)) {
+ yaml_parser_set_scanner_error(parser, "while scanning a %TAG directive",
+ start_mark, "did not find expected whitespace or line break");
+ goto error;
+ }
+
+ *handle = handle_value;
+ *prefix = prefix_value;
+
+ return 1;
+
+error:
+ yaml_free(handle_value);
+ yaml_free(prefix_value);
+ return 0;
+}
+
+static int
+yaml_parser_scan_anchor(yaml_parser_t *parser, yaml_token_t *token,
+ yaml_token_type_t type)
+{
+ int length = 0;
+ yaml_mark_t start_mark, end_mark;
+ yaml_string_t string = NULL_STRING;
+
+ if (!STRING_INIT(parser, string, INITIAL_STRING_SIZE)) goto error;
+
+ /* Eat the indicator character. */
+
+ start_mark = parser->mark;
+
+ SKIP(parser);
+
+ /* Consume the value. */
+
+ if (!CACHE(parser, 1)) goto error;
+
+ while (IS_ALPHA(parser->buffer)) {
+ if (!READ(parser, string)) goto error;
+ if (!CACHE(parser, 1)) goto error;
+ length ++;
+ }
+
+ end_mark = parser->mark;
+
+ /*
+ * Check if length of the anchor is greater than 0 and it is followed by
+ * a whitespace character or one of the indicators:
+ *
+ * '?', ':', ',', ']', '}', '%', '@', '`'.
+ */
+
+ if (!length || !(IS_BLANKZ(parser->buffer) || CHECK(parser->buffer, '?')
+ || CHECK(parser->buffer, ':') || CHECK(parser->buffer, ',')
+ || CHECK(parser->buffer, ']') || CHECK(parser->buffer, '}')
+ || CHECK(parser->buffer, '%') || CHECK(parser->buffer, '@')
+ || CHECK(parser->buffer, '`'))) {
+ yaml_parser_set_scanner_error(parser, type == YAML_ANCHOR_TOKEN ?
+ "while scanning an anchor" : "while scanning an alias", start_mark,
+ "did not find expected alphabetic or numeric character");
+ goto error;
+ }
+
+ /* Create a token. */
+
+ if (type == YAML_ANCHOR_TOKEN) {
+ ANCHOR_TOKEN_INIT(*token, string.start, start_mark, end_mark);
+ }
+ else {
+ ALIAS_TOKEN_INIT(*token, string.start, start_mark, end_mark);
+ }
+
+ return 1;
+
+error:
+ STRING_DEL(parser, string);
+ return 0;
+}
+
+/*
+ * Scan a TAG token.
+ */
+
+static int
+yaml_parser_scan_tag(yaml_parser_t *parser, yaml_token_t *token)
+{
+ yaml_char_t *handle = NULL;
+ yaml_char_t *suffix = NULL;
+ yaml_mark_t start_mark, end_mark;
+
+ start_mark = parser->mark;
+
+ /* Check if the tag is in the canonical form. */
+
+ if (!CACHE(parser, 2)) goto error;
+
+ if (CHECK_AT(parser->buffer, '<', 1))
+ {
+ /* Set the handle to '' */
+
+ handle = yaml_malloc(1);
+ if (!handle) goto error;
+ handle[0] = '\0';
+
+ /* Eat '!<' */
+
+ SKIP(parser);
+ SKIP(parser);
+
+ /* Consume the tag value. */
+
+ if (!yaml_parser_scan_tag_uri(parser, 0, NULL, start_mark, &suffix))
+ goto error;
+
+ /* Check for '>' and eat it. */
+
+ if (!CHECK(parser->buffer, '>')) {
+ yaml_parser_set_scanner_error(parser, "while scanning a tag",
+ start_mark, "did not find the expected '>'");
+ goto error;
+ }
+
+ SKIP(parser);
+ }
+ else
+ {
+ /* The tag has either the '!suffix' or the '!handle!suffix' form. */
+
+ /* First, try to scan a handle. */
+
+ if (!yaml_parser_scan_tag_handle(parser, 0, start_mark, &handle))
+ goto error;
+
+ /* Check if it is, indeed, handle. */
+
+ if (handle[0] == '!' && handle[1] != '\0' && handle[strlen((char *)handle)-1] == '!')
+ {
+ /* Scan the suffix now. */
+
+ if (!yaml_parser_scan_tag_uri(parser, 0, NULL, start_mark, &suffix))
+ goto error;
+ }
+ else
+ {
+ /* It wasn't a handle after all. Scan the rest of the tag. */
+
+ if (!yaml_parser_scan_tag_uri(parser, 0, handle, start_mark, &suffix))
+ goto error;
+
+ /* Set the handle to '!'. */
+
+ yaml_free(handle);
+ handle = yaml_malloc(2);
+ if (!handle) goto error;
+ handle[0] = '!';
+ handle[1] = '\0';
+
+ /*
+ * A special case: the '!' tag. Set the handle to '' and the
+ * suffix to '!'.
+ */
+
+ if (suffix[0] == '\0') {
+ yaml_char_t *tmp = handle;
+ handle = suffix;
+ suffix = tmp;
+ }
+ }
+ }
+
+ /* Check the character which ends the tag. */
+
+ if (!CACHE(parser, 1)) goto error;
+
+ if (!IS_BLANKZ(parser->buffer)) {
+ yaml_parser_set_scanner_error(parser, "while scanning a tag",
+ start_mark, "did not find expected whitespace or line break");
+ goto error;
+ }
+
+ end_mark = parser->mark;
+
+ /* Create a token. */
+
+ TAG_TOKEN_INIT(*token, handle, suffix, start_mark, end_mark);
+
+ return 1;
+
+error:
+ yaml_free(handle);
+ yaml_free(suffix);
+ return 0;
+}
+
+/*
+ * Scan a tag handle.
+ */
+
+static int
+yaml_parser_scan_tag_handle(yaml_parser_t *parser, int directive,
+ yaml_mark_t start_mark, yaml_char_t **handle)
+{
+ yaml_string_t string = NULL_STRING;
+
+ if (!STRING_INIT(parser, string, INITIAL_STRING_SIZE)) goto error;
+
+ /* Check the initial '!' character. */
+
+ if (!CACHE(parser, 1)) goto error;
+
+ if (!CHECK(parser->buffer, '!')) {
+ yaml_parser_set_scanner_error(parser, directive ?
+ "while scanning a tag directive" : "while scanning a tag",
+ start_mark, "did not find expected '!'");
+ goto error;
+ }
+
+ /* Copy the '!' character. */
+
+ if (!READ(parser, string)) goto error;
+
+ /* Copy all subsequent alphabetical and numerical characters. */
+
+ if (!CACHE(parser, 1)) goto error;
+
+ while (IS_ALPHA(parser->buffer))
+ {
+ if (!READ(parser, string)) goto error;
+ if (!CACHE(parser, 1)) goto error;
+ }
+
+ /* Check if the trailing character is '!' and copy it. */
+
+ if (CHECK(parser->buffer, '!'))
+ {
+ if (!READ(parser, string)) goto error;
+ }
+ else
+ {
+ /*
+ * It's either the '!' tag or not really a tag handle. If it's a %TAG
+ * directive, it's an error. If it's a tag token, it must be a part of
+ * URI.
+ */
+
+ if (directive && !(string.start[0] == '!' && string.start[1] == '\0')) {
+ yaml_parser_set_scanner_error(parser, "while parsing a tag directive",
+ start_mark, "did not find expected '!'");
+ goto error;
+ }
+ }
+
+ *handle = string.start;
+
+ return 1;
+
+error:
+ STRING_DEL(parser, string);
+ return 0;
+}
+
+/*
+ * Scan a tag.
+ */
+
+static int
+yaml_parser_scan_tag_uri(yaml_parser_t *parser, int directive,
+ yaml_char_t *head, yaml_mark_t start_mark, yaml_char_t **uri)
+{
+ size_t length = head ? strlen((char *)head) : 0;
+ yaml_string_t string = NULL_STRING;
+
+ if (!STRING_INIT(parser, string, INITIAL_STRING_SIZE)) goto error;
+
+ /* Resize the string to include the head. */
+
+ while ((size_t)(string.end - string.start) <= length) {
+ if (!yaml_string_extend(&string.start, &string.pointer, &string.end)) {
+ parser->error = YAML_MEMORY_ERROR;
+ goto error;
+ }
+ }
+
+ /*
+ * Copy the head if needed.
+ *
+ * Note that we don't copy the leading '!' character.
+ */
+
+ if (length > 1) {
+ memcpy(string.start, head+1, length-1);
+ string.pointer += length-1;
+ }
+
+ /* Scan the tag. */
+
+ if (!CACHE(parser, 1)) goto error;
+
+ /*
+ * The set of characters that may appear in URI is as follows:
+ *
+ * '0'-'9', 'A'-'Z', 'a'-'z', '_', '-', ';', '/', '?', ':', '@', '&',
+ * '=', '+', '$', ',', '.', '!', '~', '*', '\'', '(', ')', '[', ']',
+ * '%'.
+ */
+
+ while (IS_ALPHA(parser->buffer) || CHECK(parser->buffer, ';')
+ || CHECK(parser->buffer, '/') || CHECK(parser->buffer, '?')
+ || CHECK(parser->buffer, ':') || CHECK(parser->buffer, '@')
+ || CHECK(parser->buffer, '&') || CHECK(parser->buffer, '=')
+ || CHECK(parser->buffer, '+') || CHECK(parser->buffer, '$')
+ || CHECK(parser->buffer, ',') || CHECK(parser->buffer, '.')
+ || CHECK(parser->buffer, '!') || CHECK(parser->buffer, '~')
+ || CHECK(parser->buffer, '*') || CHECK(parser->buffer, '\'')
+ || CHECK(parser->buffer, '(') || CHECK(parser->buffer, ')')
+ || CHECK(parser->buffer, '[') || CHECK(parser->buffer, ']')
+ || CHECK(parser->buffer, '%'))
+ {
+ /* Check if it is a URI-escape sequence. */
+
+ if (CHECK(parser->buffer, '%')) {
+ if (!STRING_EXTEND(parser, string))
+ goto error;
+
+ if (!yaml_parser_scan_uri_escapes(parser,
+ directive, start_mark, &string)) goto error;
+ }
+ else {
+ if (!READ(parser, string)) goto error;
+ }
+
+ length ++;
+ if (!CACHE(parser, 1)) goto error;
+ }
+
+ /* Check if the tag is non-empty. */
+
+ if (!length) {
+ if (!STRING_EXTEND(parser, string))
+ goto error;
+
+ yaml_parser_set_scanner_error(parser, directive ?
+ "while parsing a %TAG directive" : "while parsing a tag",
+ start_mark, "did not find expected tag URI");
+ goto error;
+ }
+
+ *uri = string.start;
+
+ return 1;
+
+error:
+ STRING_DEL(parser, string);
+ return 0;
+}
+
+/*
+ * Decode an URI-escape sequence corresponding to a single UTF-8 character.
+ */
+
+static int
+yaml_parser_scan_uri_escapes(yaml_parser_t *parser, int directive,
+ yaml_mark_t start_mark, yaml_string_t *string)
+{
+ int width = 0;
+
+ /* Decode the required number of characters. */
+
+ do {
+
+ unsigned char octet = 0;
+
+ /* Check for a URI-escaped octet. */
+
+ if (!CACHE(parser, 3)) return 0;
+
+ if (!(CHECK(parser->buffer, '%')
+ && IS_HEX_AT(parser->buffer, 1)
+ && IS_HEX_AT(parser->buffer, 2))) {
+ return yaml_parser_set_scanner_error(parser, directive ?
+ "while parsing a %TAG directive" : "while parsing a tag",
+ start_mark, "did not find URI escaped octet");
+ }
+
+ /* Get the octet. */
+
+ octet = (AS_HEX_AT(parser->buffer, 1) << 4) + AS_HEX_AT(parser->buffer, 2);
+
+ /* If it is the leading octet, determine the length of the UTF-8 sequence. */
+
+ if (!width)
+ {
+ width = (octet & 0x80) == 0x00 ? 1 :
+ (octet & 0xE0) == 0xC0 ? 2 :
+ (octet & 0xF0) == 0xE0 ? 3 :
+ (octet & 0xF8) == 0xF0 ? 4 : 0;
+ if (!width) {
+ return yaml_parser_set_scanner_error(parser, directive ?
+ "while parsing a %TAG directive" : "while parsing a tag",
+ start_mark, "found an incorrect leading UTF-8 octet");
+ }
+ }
+ else
+ {
+ /* Check if the trailing octet is correct. */
+
+ if ((octet & 0xC0) != 0x80) {
+ return yaml_parser_set_scanner_error(parser, directive ?
+ "while parsing a %TAG directive" : "while parsing a tag",
+ start_mark, "found an incorrect trailing UTF-8 octet");
+ }
+ }
+
+ /* Copy the octet and move the pointers. */
+
+ *(string->pointer++) = octet;
+ SKIP(parser);
+ SKIP(parser);
+ SKIP(parser);
+
+ } while (--width);
+
+ return 1;
+}
+
+/*
+ * Scan a block scalar.
+ */
+
+static int
+yaml_parser_scan_block_scalar(yaml_parser_t *parser, yaml_token_t *token,
+ int literal)
+{
+ yaml_mark_t start_mark;
+ yaml_mark_t end_mark;
+ yaml_string_t string = NULL_STRING;
+ yaml_string_t leading_break = NULL_STRING;
+ yaml_string_t trailing_breaks = NULL_STRING;
+ int chomping = 0;
+ int increment = 0;
+ int indent = 0;
+ int leading_blank = 0;
+ int trailing_blank = 0;
+
+ if (!STRING_INIT(parser, string, INITIAL_STRING_SIZE)) goto error;
+ if (!STRING_INIT(parser, leading_break, INITIAL_STRING_SIZE)) goto error;
+ if (!STRING_INIT(parser, trailing_breaks, INITIAL_STRING_SIZE)) goto error;
+
+ /* Eat the indicator '|' or '>'. */
+
+ start_mark = parser->mark;
+
+ SKIP(parser);
+
+ /* Scan the additional block scalar indicators. */
+
+ if (!CACHE(parser, 1)) goto error;
+
+ /* Check for a chomping indicator. */
+
+ if (CHECK(parser->buffer, '+') || CHECK(parser->buffer, '-'))
+ {
+ /* Set the chomping method and eat the indicator. */
+
+ chomping = CHECK(parser->buffer, '+') ? +1 : -1;
+
+ SKIP(parser);
+
+ /* Check for an indentation indicator. */
+
+ if (!CACHE(parser, 1)) goto error;
+
+ if (IS_DIGIT(parser->buffer))
+ {
+ /* Check that the indentation is greater than 0. */
+
+ if (CHECK(parser->buffer, '0')) {
+ yaml_parser_set_scanner_error(parser, "while scanning a block scalar",
+ start_mark, "found an indentation indicator equal to 0");
+ goto error;
+ }
+
+ /* Get the indentation level and eat the indicator. */
+
+ increment = AS_DIGIT(parser->buffer);
+
+ SKIP(parser);
+ }
+ }
+
+ /* Do the same as above, but in the opposite order. */
+
+ else if (IS_DIGIT(parser->buffer))
+ {
+ if (CHECK(parser->buffer, '0')) {
+ yaml_parser_set_scanner_error(parser, "while scanning a block scalar",
+ start_mark, "found an indentation indicator equal to 0");
+ goto error;
+ }
+
+ increment = AS_DIGIT(parser->buffer);
+
+ SKIP(parser);
+
+ if (!CACHE(parser, 1)) goto error;
+
+ if (CHECK(parser->buffer, '+') || CHECK(parser->buffer, '-')) {
+ chomping = CHECK(parser->buffer, '+') ? +1 : -1;
+
+ SKIP(parser);
+ }
+ }
+
+ /* Eat whitespaces and comments to the end of the line. */
+
+ if (!CACHE(parser, 1)) goto error;
+
+ while (IS_BLANK(parser->buffer)) {
+ SKIP(parser);
+ if (!CACHE(parser, 1)) goto error;
+ }
+
+ if (CHECK(parser->buffer, '#')) {
+ while (!IS_BREAKZ(parser->buffer)) {
+ SKIP(parser);
+ if (!CACHE(parser, 1)) goto error;
+ }
+ }
+
+ /* Check if we are at the end of the line. */
+
+ if (!IS_BREAKZ(parser->buffer)) {
+ yaml_parser_set_scanner_error(parser, "while scanning a block scalar",
+ start_mark, "did not find expected comment or line break");
+ goto error;
+ }
+
+ /* Eat a line break. */
+
+ if (IS_BREAK(parser->buffer)) {
+ if (!CACHE(parser, 2)) goto error;
+ SKIP_LINE(parser);
+ }
+
+ end_mark = parser->mark;
+
+ /* Set the indentation level if it was specified. */
+
+ if (increment) {
+ indent = parser->indent >= 0 ? parser->indent+increment : increment;
+ }
+
+ /* Scan the leading line breaks and determine the indentation level if needed. */
+
+ if (!yaml_parser_scan_block_scalar_breaks(parser, &indent, &trailing_breaks,
+ start_mark, &end_mark)) goto error;
+
+ /* Scan the block scalar content. */
+
+ if (!CACHE(parser, 1)) goto error;
+
+ while ((int)parser->mark.column == indent && !IS_Z(parser->buffer))
+ {
+ /*
+ * We are at the beginning of a non-empty line.
+ */
+
+ /* Is it a trailing whitespace? */
+
+ trailing_blank = IS_BLANK(parser->buffer);
+
+ /* Check if we need to fold the leading line break. */
+
+ if (!literal && (*leading_break.start == '\n')
+ && !leading_blank && !trailing_blank)
+ {
+ /* Do we need to join the lines by space? */
+
+ if (*trailing_breaks.start == '\0') {
+ if (!STRING_EXTEND(parser, string)) goto error;
+ *(string.pointer ++) = ' ';
+ }
+
+ CLEAR(parser, leading_break);
+ }
+ else {
+ if (!JOIN(parser, string, leading_break)) goto error;
+ CLEAR(parser, leading_break);
+ }
+
+ /* Append the remaining line breaks. */
+
+ if (!JOIN(parser, string, trailing_breaks)) goto error;
+ CLEAR(parser, trailing_breaks);
+
+ /* Is it a leading whitespace? */
+
+ leading_blank = IS_BLANK(parser->buffer);
+
+ /* Consume the current line. */
+
+ while (!IS_BREAKZ(parser->buffer)) {
+ if (!READ(parser, string)) goto error;
+ if (!CACHE(parser, 1)) goto error;
+ }
+
+ /* Consume the line break. */
+
+ if (!CACHE(parser, 2)) goto error;
+
+ if (!READ_LINE(parser, leading_break)) goto error;
+
+ /* Eat the following indentation spaces and line breaks. */
+
+ if (!yaml_parser_scan_block_scalar_breaks(parser,
+ &indent, &trailing_breaks, start_mark, &end_mark)) goto error;
+ }
+
+ /* Chomp the tail. */
+
+ if (chomping != -1) {
+ if (!JOIN(parser, string, leading_break)) goto error;
+ }
+ if (chomping == 1) {
+ if (!JOIN(parser, string, trailing_breaks)) goto error;
+ }
+
+ /* Create a token. */
+
+ SCALAR_TOKEN_INIT(*token, string.start, string.pointer-string.start,
+ literal ? YAML_LITERAL_SCALAR_STYLE : YAML_FOLDED_SCALAR_STYLE,
+ start_mark, end_mark);
+
+ STRING_DEL(parser, leading_break);
+ STRING_DEL(parser, trailing_breaks);
+
+ return 1;
+
+error:
+ STRING_DEL(parser, string);
+ STRING_DEL(parser, leading_break);
+ STRING_DEL(parser, trailing_breaks);
+
+ return 0;
+}
+
+/*
+ * Scan indentation spaces and line breaks for a block scalar. Determine the
+ * indentation level if needed.
+ */
+
+static int
+yaml_parser_scan_block_scalar_breaks(yaml_parser_t *parser,
+ int *indent, yaml_string_t *breaks,
+ yaml_mark_t start_mark, yaml_mark_t *end_mark)
+{
+ int max_indent = 0;
+
+ *end_mark = parser->mark;
+
+ /* Eat the indentation spaces and line breaks. */
+
+ while (1)
+ {
+ /* Eat the indentation spaces. */
+
+ if (!CACHE(parser, 1)) return 0;
+
+ while ((!*indent || (int)parser->mark.column < *indent)
+ && IS_SPACE(parser->buffer)) {
+ SKIP(parser);
+ if (!CACHE(parser, 1)) return 0;
+ }
+
+ if ((int)parser->mark.column > max_indent)
+ max_indent = (int)parser->mark.column;
+
+ /* Check for a tab character messing the indentation. */
+
+ if ((!*indent || (int)parser->mark.column < *indent)
+ && IS_TAB(parser->buffer)) {
+ return yaml_parser_set_scanner_error(parser, "while scanning a block scalar",
+ start_mark, "found a tab character where an indentation space is expected");
+ }
+
+ /* Have we found a non-empty line? */
+
+ if (!IS_BREAK(parser->buffer)) break;
+
+ /* Consume the line break. */
+
+ if (!CACHE(parser, 2)) return 0;
+ if (!READ_LINE(parser, *breaks)) return 0;
+ *end_mark = parser->mark;
+ }
+
+ /* Determine the indentation level if needed. */
+
+ if (!*indent) {
+ *indent = max_indent;
+ if (*indent < parser->indent + 1)
+ *indent = parser->indent + 1;
+ if (*indent < 1)
+ *indent = 1;
+ }
+
+ return 1;
+}
+
+/*
+ * Scan a quoted scalar.
+ */
+
+static int
+yaml_parser_scan_flow_scalar(yaml_parser_t *parser, yaml_token_t *token,
+ int single)
+{
+ yaml_mark_t start_mark;
+ yaml_mark_t end_mark;
+ yaml_string_t string = NULL_STRING;
+ yaml_string_t leading_break = NULL_STRING;
+ yaml_string_t trailing_breaks = NULL_STRING;
+ yaml_string_t whitespaces = NULL_STRING;
+ int leading_blanks;
+
+ if (!STRING_INIT(parser, string, INITIAL_STRING_SIZE)) goto error;
+ if (!STRING_INIT(parser, leading_break, INITIAL_STRING_SIZE)) goto error;
+ if (!STRING_INIT(parser, trailing_breaks, INITIAL_STRING_SIZE)) goto error;
+ if (!STRING_INIT(parser, whitespaces, INITIAL_STRING_SIZE)) goto error;
+
+ /* Eat the left quote. */
+
+ start_mark = parser->mark;
+
+ SKIP(parser);
+
+ /* Consume the content of the quoted scalar. */
+
+ while (1)
+ {
+ /* Check that there are no document indicators at the beginning of the line. */
+
+ if (!CACHE(parser, 4)) goto error;
+
+ if (parser->mark.column == 0 &&
+ ((CHECK_AT(parser->buffer, '-', 0) &&
+ CHECK_AT(parser->buffer, '-', 1) &&
+ CHECK_AT(parser->buffer, '-', 2)) ||
+ (CHECK_AT(parser->buffer, '.', 0) &&
+ CHECK_AT(parser->buffer, '.', 1) &&
+ CHECK_AT(parser->buffer, '.', 2))) &&
+ IS_BLANKZ_AT(parser->buffer, 3))
+ {
+ yaml_parser_set_scanner_error(parser, "while scanning a quoted scalar",
+ start_mark, "found unexpected document indicator");
+ goto error;
+ }
+
+ /* Check for EOF. */
+
+ if (IS_Z(parser->buffer)) {
+ yaml_parser_set_scanner_error(parser, "while scanning a quoted scalar",
+ start_mark, "found unexpected end of stream");
+ goto error;
+ }
+
+ /* Consume non-blank characters. */
+
+ if (!CACHE(parser, 2)) goto error;
+
+ leading_blanks = 0;
+
+ while (!IS_BLANKZ(parser->buffer))
+ {
+ /* Check for an escaped single quote. */
+
+ if (single && CHECK_AT(parser->buffer, '\'', 0)
+ && CHECK_AT(parser->buffer, '\'', 1))
+ {
+ if (!STRING_EXTEND(parser, string)) goto error;
+ *(string.pointer++) = '\'';
+ SKIP(parser);
+ SKIP(parser);
+ }
+
+ /* Check for the right quote. */
+
+ else if (CHECK(parser->buffer, single ? '\'' : '"'))
+ {
+ break;
+ }
+
+ /* Check for an escaped line break. */
+
+ else if (!single && CHECK(parser->buffer, '\\')
+ && IS_BREAK_AT(parser->buffer, 1))
+ {
+ if (!CACHE(parser, 3)) goto error;
+ SKIP(parser);
+ SKIP_LINE(parser);
+ leading_blanks = 1;
+ break;
+ }
+
+ /* Check for an escape sequence. */
+
+ else if (!single && CHECK(parser->buffer, '\\'))
+ {
+ size_t code_length = 0;
+
+ if (!STRING_EXTEND(parser, string)) goto error;
+
+ /* Check the escape character. */
+
+ switch (parser->buffer.pointer[1])
+ {
+ case '0':
+ *(string.pointer++) = '\0';
+ break;
+
+ case 'a':
+ *(string.pointer++) = '\x07';
+ break;
+
+ case 'b':
+ *(string.pointer++) = '\x08';
+ break;
+
+ case 't':
+ case '\t':
+ *(string.pointer++) = '\x09';
+ break;
+
+ case 'n':
+ *(string.pointer++) = '\x0A';
+ break;
+
+ case 'v':
+ *(string.pointer++) = '\x0B';
+ break;
+
+ case 'f':
+ *(string.pointer++) = '\x0C';
+ break;
+
+ case 'r':
+ *(string.pointer++) = '\x0D';
+ break;
+
+ case 'e':
+ *(string.pointer++) = '\x1B';
+ break;
+
+ case ' ':
+ *(string.pointer++) = '\x20';
+ break;
+
+ case '"':
+ *(string.pointer++) = '"';
+ break;
+
+ case '/':
+ *(string.pointer++) = '/';
+ break;
+
+ case '\\':
+ *(string.pointer++) = '\\';
+ break;
+
+ case 'N': /* NEL (#x85) */
+ *(string.pointer++) = '\xC2';
+ *(string.pointer++) = '\x85';
+ break;
+
+ case '_': /* #xA0 */
+ *(string.pointer++) = '\xC2';
+ *(string.pointer++) = '\xA0';
+ break;
+
+ case 'L': /* LS (#x2028) */
+ *(string.pointer++) = '\xE2';
+ *(string.pointer++) = '\x80';
+ *(string.pointer++) = '\xA8';
+ break;
+
+ case 'P': /* PS (#x2029) */
+ *(string.pointer++) = '\xE2';
+ *(string.pointer++) = '\x80';
+ *(string.pointer++) = '\xA9';
+ break;
+
+ case 'x':
+ code_length = 2;
+ break;
+
+ case 'u':
+ code_length = 4;
+ break;
+
+ case 'U':
+ code_length = 8;
+ break;
+
+ default:
+ yaml_parser_set_scanner_error(parser, "while parsing a quoted scalar",
+ start_mark, "found unknown escape character");
+ goto error;
+ }
+
+ SKIP(parser);
+ SKIP(parser);
+
+ /* Consume an arbitrary escape code. */
+
+ if (code_length)
+ {
+ unsigned int value = 0;
+ size_t k;
+
+ /* Scan the character value. */
+
+ if (!CACHE(parser, code_length)) goto error;
+
+ for (k = 0; k < code_length; k ++) {
+ if (!IS_HEX_AT(parser->buffer, k)) {
+ yaml_parser_set_scanner_error(parser, "while parsing a quoted scalar",
+ start_mark, "did not find expected hexdecimal number");
+ goto error;
+ }
+ value = (value << 4) + AS_HEX_AT(parser->buffer, k);
+ }
+
+ /* Check the value and write the character. */
+
+ if ((value >= 0xD800 && value <= 0xDFFF) || value > 0x10FFFF) {
+ yaml_parser_set_scanner_error(parser, "while parsing a quoted scalar",
+ start_mark, "found invalid Unicode character escape code");
+ goto error;
+ }
+
+ if (value <= 0x7F) {
+ *(string.pointer++) = value;
+ }
+ else if (value <= 0x7FF) {
+ *(string.pointer++) = 0xC0 + (value >> 6);
+ *(string.pointer++) = 0x80 + (value & 0x3F);
+ }
+ else if (value <= 0xFFFF) {
+ *(string.pointer++) = 0xE0 + (value >> 12);
+ *(string.pointer++) = 0x80 + ((value >> 6) & 0x3F);
+ *(string.pointer++) = 0x80 + (value & 0x3F);
+ }
+ else {
+ *(string.pointer++) = 0xF0 + (value >> 18);
+ *(string.pointer++) = 0x80 + ((value >> 12) & 0x3F);
+ *(string.pointer++) = 0x80 + ((value >> 6) & 0x3F);
+ *(string.pointer++) = 0x80 + (value & 0x3F);
+ }
+
+ /* Advance the pointer. */
+
+ for (k = 0; k < code_length; k ++) {
+ SKIP(parser);
+ }
+ }
+ }
+
+ else
+ {
+ /* It is a non-escaped non-blank character. */
+
+ if (!READ(parser, string)) goto error;
+ }
+
+ if (!CACHE(parser, 2)) goto error;
+ }
+
+ /* Check if we are at the end of the scalar. */
+
+ /* Fix for crash unitialized value crash
+ * Credit for the bug and input is to OSS Fuzz
+ * Credit for the fix to Alex Gaynor
+ */
+ if (!CACHE(parser, 1)) goto error;
+ if (CHECK(parser->buffer, single ? '\'' : '"'))
+ break;
+
+ /* Consume blank characters. */
+
+ if (!CACHE(parser, 1)) goto error;
+
+ while (IS_BLANK(parser->buffer) || IS_BREAK(parser->buffer))
+ {
+ if (IS_BLANK(parser->buffer))
+ {
+ /* Consume a space or a tab character. */
+
+ if (!leading_blanks) {
+ if (!READ(parser, whitespaces)) goto error;
+ }
+ else {
+ SKIP(parser);
+ }
+ }
+ else
+ {
+ if (!CACHE(parser, 2)) goto error;
+
+ /* Check if it is a first line break. */
+
+ if (!leading_blanks)
+ {
+ CLEAR(parser, whitespaces);
+ if (!READ_LINE(parser, leading_break)) goto error;
+ leading_blanks = 1;
+ }
+ else
+ {
+ if (!READ_LINE(parser, trailing_breaks)) goto error;
+ }
+ }
+ if (!CACHE(parser, 1)) goto error;
+ }
+
+ /* Join the whitespaces or fold line breaks. */
+
+ if (leading_blanks)
+ {
+ /* Do we need to fold line breaks? */
+
+ if (leading_break.start[0] == '\n') {
+ if (trailing_breaks.start[0] == '\0') {
+ if (!STRING_EXTEND(parser, string)) goto error;
+ *(string.pointer++) = ' ';
+ }
+ else {
+ if (!JOIN(parser, string, trailing_breaks)) goto error;
+ CLEAR(parser, trailing_breaks);
+ }
+ CLEAR(parser, leading_break);
+ }
+ else {
+ if (!JOIN(parser, string, leading_break)) goto error;
+ if (!JOIN(parser, string, trailing_breaks)) goto error;
+ CLEAR(parser, leading_break);
+ CLEAR(parser, trailing_breaks);
+ }
+ }
+ else
+ {
+ if (!JOIN(parser, string, whitespaces)) goto error;
+ CLEAR(parser, whitespaces);
+ }
+ }
+
+ /* Eat the right quote. */
+
+ SKIP(parser);
+
+ end_mark = parser->mark;
+
+ /* Create a token. */
+
+ SCALAR_TOKEN_INIT(*token, string.start, string.pointer-string.start,
+ single ? YAML_SINGLE_QUOTED_SCALAR_STYLE : YAML_DOUBLE_QUOTED_SCALAR_STYLE,
+ start_mark, end_mark);
+
+ STRING_DEL(parser, leading_break);
+ STRING_DEL(parser, trailing_breaks);
+ STRING_DEL(parser, whitespaces);
+
+ return 1;
+
+error:
+ STRING_DEL(parser, string);
+ STRING_DEL(parser, leading_break);
+ STRING_DEL(parser, trailing_breaks);
+ STRING_DEL(parser, whitespaces);
+
+ return 0;
+}
+
+/*
+ * Scan a plain scalar.
+ */
+
+static int
+yaml_parser_scan_plain_scalar(yaml_parser_t *parser, yaml_token_t *token)
+{
+ yaml_mark_t start_mark;
+ yaml_mark_t end_mark;
+ yaml_string_t string = NULL_STRING;
+ yaml_string_t leading_break = NULL_STRING;
+ yaml_string_t trailing_breaks = NULL_STRING;
+ yaml_string_t whitespaces = NULL_STRING;
+ int leading_blanks = 0;
+ int indent = parser->indent+1;
+
+ if (!STRING_INIT(parser, string, INITIAL_STRING_SIZE)) goto error;
+ if (!STRING_INIT(parser, leading_break, INITIAL_STRING_SIZE)) goto error;
+ if (!STRING_INIT(parser, trailing_breaks, INITIAL_STRING_SIZE)) goto error;
+ if (!STRING_INIT(parser, whitespaces, INITIAL_STRING_SIZE)) goto error;
+
+ start_mark = end_mark = parser->mark;
+
+ /* Consume the content of the plain scalar. */
+
+ while (1)
+ {
+ /* Check for a document indicator. */
+
+ if (!CACHE(parser, 4)) goto error;
+
+ if (parser->mark.column == 0 &&
+ ((CHECK_AT(parser->buffer, '-', 0) &&
+ CHECK_AT(parser->buffer, '-', 1) &&
+ CHECK_AT(parser->buffer, '-', 2)) ||
+ (CHECK_AT(parser->buffer, '.', 0) &&
+ CHECK_AT(parser->buffer, '.', 1) &&
+ CHECK_AT(parser->buffer, '.', 2))) &&
+ IS_BLANKZ_AT(parser->buffer, 3)) break;
+
+ /* Check for a comment. */
+
+ if (CHECK(parser->buffer, '#'))
+ break;
+
+ /* Consume non-blank characters. */
+
+ while (!IS_BLANKZ(parser->buffer))
+ {
+ /* Check for 'x:x' in the flow context. TODO: Fix the test "spec-08-13". */
+
+ if (parser->flow_level
+ && CHECK(parser->buffer, ':')
+ && !IS_BLANKZ_AT(parser->buffer, 1)) {
+ yaml_parser_set_scanner_error(parser, "while scanning a plain scalar",
+ start_mark, "found unexpected ':'");
+ goto error;
+ }
+
+ /* Check for indicators that may end a plain scalar. */
+
+ if ((CHECK(parser->buffer, ':') && IS_BLANKZ_AT(parser->buffer, 1))
+ || (parser->flow_level &&
+ (CHECK(parser->buffer, ',') || CHECK(parser->buffer, ':')
+ || CHECK(parser->buffer, '?') || CHECK(parser->buffer, '[')
+ || CHECK(parser->buffer, ']') || CHECK(parser->buffer, '{')
+ || CHECK(parser->buffer, '}'))))
+ break;
+
+ /* Check if we need to join whitespaces and breaks. */
+
+ if (leading_blanks || whitespaces.start != whitespaces.pointer)
+ {
+ if (leading_blanks)
+ {
+ /* Do we need to fold line breaks? */
+
+ if (leading_break.start[0] == '\n') {
+ if (trailing_breaks.start[0] == '\0') {
+ if (!STRING_EXTEND(parser, string)) goto error;
+ *(string.pointer++) = ' ';
+ }
+ else {
+ if (!JOIN(parser, string, trailing_breaks)) goto error;
+ CLEAR(parser, trailing_breaks);
+ }
+ CLEAR(parser, leading_break);
+ }
+ else {
+ if (!JOIN(parser, string, leading_break)) goto error;
+ if (!JOIN(parser, string, trailing_breaks)) goto error;
+ CLEAR(parser, leading_break);
+ CLEAR(parser, trailing_breaks);
+ }
+
+ leading_blanks = 0;
+ }
+ else
+ {
+ if (!JOIN(parser, string, whitespaces)) goto error;
+ CLEAR(parser, whitespaces);
+ }
+ }
+
+ /* Copy the character. */
+
+ if (!READ(parser, string)) goto error;
+
+ end_mark = parser->mark;
+
+ if (!CACHE(parser, 2)) goto error;
+ }
+
+ /* Is it the end? */
+
+ if (!(IS_BLANK(parser->buffer) || IS_BREAK(parser->buffer)))
+ break;
+
+ /* Consume blank characters. */
+
+ if (!CACHE(parser, 1)) goto error;
+
+ while (IS_BLANK(parser->buffer) || IS_BREAK(parser->buffer))
+ {
+ if (IS_BLANK(parser->buffer))
+ {
+ /* Check for tab character that abuse indentation. */
+
+ if (leading_blanks && (int)parser->mark.column < indent
+ && IS_TAB(parser->buffer)) {
+ yaml_parser_set_scanner_error(parser, "while scanning a plain scalar",
+ start_mark, "found a tab character that violate indentation");
+ goto error;
+ }
+
+ /* Consume a space or a tab character. */
+
+ if (!leading_blanks) {
+ if (!READ(parser, whitespaces)) goto error;
+ }
+ else {
+ SKIP(parser);
+ }
+ }
+ else
+ {
+ if (!CACHE(parser, 2)) goto error;
+
+ /* Check if it is a first line break. */
+
+ if (!leading_blanks)
+ {
+ CLEAR(parser, whitespaces);
+ if (!READ_LINE(parser, leading_break)) goto error;
+ leading_blanks = 1;
+ }
+ else
+ {
+ if (!READ_LINE(parser, trailing_breaks)) goto error;
+ }
+ }
+ if (!CACHE(parser, 1)) goto error;
+ }
+
+ /* Check indentation level. */
+
+ if (!parser->flow_level && (int)parser->mark.column < indent)
+ break;
+ }
+
+ /* Create a token. */
+
+ SCALAR_TOKEN_INIT(*token, string.start, string.pointer-string.start,
+ YAML_PLAIN_SCALAR_STYLE, start_mark, end_mark);
+
+ /* Note that we change the 'simple_key_allowed' flag. */
+
+ if (leading_blanks) {
+ parser->simple_key_allowed = 1;
+ }
+
+ STRING_DEL(parser, leading_break);
+ STRING_DEL(parser, trailing_breaks);
+ STRING_DEL(parser, whitespaces);
+
+ return 1;
+
+error:
+ STRING_DEL(parser, string);
+ STRING_DEL(parser, leading_break);
+ STRING_DEL(parser, trailing_breaks);
+ STRING_DEL(parser, whitespaces);
+
+ return 0;
+}
andersk / libyaml.git / blobdiff