#define CHECK(parser,octet) CHECK_AT(parser,(octet),0)
+/*
+ * Check if the character at the specified position is an alphabetical
+ * character, a digit, '_', or '-'.
+ */
+
+#define IS_ALPHA_AT(parser,offset) \
+ ((parser->pointer[offset] >= (yaml_char_t) '0' && \
+ parser->pointer[offset] <= (yaml_char_t) '9') || \
+ (parser->pointer[offset] >= (yaml_char_t) 'A' && \
+ parser->pointer[offset] <= (yaml_char_t) 'Z') || \
+ (parser->pointer[offset] >= (yaml_char_t) 'a' && \
+ parser->pointer[offset] <= (yaml_char_t) 'z') || \
+ parser->pointer[offset] == '_' || \
+ parser->pointer[offset] == '-')
+
+#define IS_ALPHA(parser) IS_ALPHA_AT(parser,0)
+
+/*
+ * Check if the character at the specified position is a digit.
+ */
+
+#define IS_DIGIT_AT(parser,offset) \
+ ((parser->pointer[offset] >= (yaml_char_t) '0' && \
+ parser->pointer[offset] <= (yaml_char_t) '9'))
+
+#define IS_DIGIT(parser) IS_DIGIT_AT(parser,0)
+
+/*
+ * Get the value of a digit.
+ */
+
+#define AS_DIGIT_AT(parser,offset) \
+ (parser->pointer[offset] - (yaml_char_t) '0')
+
+#define AS_DIGIT(parser) AS_DIGIT_AT(parser,0)
+
+/*
+ * Check if the character at the specified position is a hex-digit.
+ */
+
+#define IS_HEX_AT(parser,offset) \
+ ((parser->pointer[offset] >= (yaml_char_t) '0' && \
+ parser->pointer[offset] <= (yaml_char_t) '9') || \
+ (parser->pointer[offset] >= (yaml_char_t) 'A' && \
+ parser->pointer[offset] <= (yaml_char_t) 'F') || \
+ (parser->pointer[offset] >= (yaml_char_t) 'a' && \
+ parser->pointer[offset] <= (yaml_char_t) 'f'))
+
+#define IS_HEX(parser) IS_HEX_AT(parser,0)
+
+/*
+ * Get the value of a hex-digit.
+ */
+
+#define AS_HEX_AT(parser,offset) \
+ ((parser->pointer[offset] >= (yaml_char_t) 'A' && \
+ parser->pointer[offset] <= (yaml_char_t) 'F') ? \
+ (parser->pointer[offset] - (yaml_char_t) 'A' + 10) : \
+ (parser->pointer[offset] >= (yaml_char_t) 'a' && \
+ parser->pointer[offset] <= (yaml_char_t) 'f') ? \
+ (parser->pointer[offset] - (yaml_char_t) 'a' + 10) : \
+ (parser->pointer[offset] - (yaml_char_t) '0'))
+
+#define AS_HEX(parser) AS_HEX_AT(parser,0)
+
/*
* Check if the character at the specified position is NUL.
*/
#define IS_Z(parser) IS_Z_AT(parser,0)
+/*
+ * Check if the character at the specified position is BOM.
+ */
+
+#define IS_BOM_AT(parser,offset) \
+ (CHECK_AT(parser,'\xEF',(offset)) \
+ && CHECK_AT(parser,'\xBB',(offset)+1) \
+ && CHECK_AT(parser,'\xBF',(offset)+1)) /* BOM (#xFEFF) */
+
+#define IS_BOM(parser) IS_BOM_AT(parser,0)
+
/*
* Check if the character at the specified position is space.
*/
(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,'\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,'\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) */
+ && CHECK_AT(parser,'\x80',(offset)+1) \
+ && CHECK_AT(parser,'\xA9',(offset)+2))) /* LS (#x2029) */
#define IS_BREAK(parser) IS_BREAK_AT(parser,0)
* Advance the buffer pointer.
*/
-#define FORWARD(parser) \
+#define FORWARD(parser) \
(parser->index ++, \
- ((IS_BREAK(parser) && !IS_CRLF(parser)) ? \
- (parser->line ++, parser->column = 0) : \
- (parser->column ++)), \
+ parser->column ++, \
parser->unread --, \
parser->pointer += WIDTH(parser))
+#define FORWARD_LINE(parser) \
+ (IS_CRLF(parser) ? \
+ (parser->index += 2, \
+ parser->column = 0, \
+ parser->unread -= 2, \
+ parser->pointer += 2) : \
+ IS_BREAK(parser) ? \
+ (parser->index ++, \
+ parser->column = 0, \
+ parser->unread --, \
+ parser->pointer += WIDTH(parser)) : 0)
+
+/*
+ * Resize a string if needed.
+ */
+
+#define RESIZE(parser,string) \
+ (string.pointer-string.buffer+5 < string.size ? 1 : \
+ yaml_parser_resize_string(parser, &string))
+
+/*
+ * Copy a character to a string buffer and advance pointers.
+ */
+
+#define COPY(parser,string) \
+ (((*parser->pointer & 0x80) == 0x00 ? \
+ (*(string.pointer++) = *(parser->pointer++)) : \
+ (*parser->pointer & 0xE0) == 0xC0 ? \
+ (*(string.pointer++) = *(parser->pointer++), \
+ *(string.pointer++) = *(parser->pointer++)) : \
+ (*parser->pointer & 0xF0) == 0xE0 ? \
+ (*(string.pointer++) = *(parser->pointer++), \
+ *(string.pointer++) = *(parser->pointer++), \
+ *(string.pointer++) = *(parser->pointer++)) : \
+ (*parser->pointer & 0xF8) == 0xF0 ? \
+ (*(string.pointer++) = *(parser->pointer++), \
+ *(string.pointer++) = *(parser->pointer++), \
+ *(string.pointer++) = *(parser->pointer++), \
+ *(string.pointer++) = *(parser->pointer++)) : 0), \
+ parser->index ++, \
+ parser->column ++, \
+ parser->unread --)
+
+
/*
* Public API declarations.
*/
static yaml_mark_t
yaml_parser_get_mark(yaml_parser_t *parser);
+/*
+ * Buffers and lists.
+ */
+
+typedef struct {
+ yaml_char_t *buffer;
+ yaml_char_t *pointer;
+ size_t size;
+} yaml_string_t;
+
+static yaml_string_t
+yaml_parser_new_string(yaml_parser_t *parser);
+
+static int
+yaml_parser_resize_string(yaml_parser_t *parser, yaml_string_t *string);
+
+static int
+yaml_parser_resize_list(yaml_parser_t *parser, void **buffer, size_t *size,
+ size_t item_size);
+
/*
* High-level token API.
*/
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_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);
return parser->tokens[parser->tokens_head];
}
+/*
+ * Create a new string.
+ */
+
+static yaml_string_t
+yaml_parser_new_string(yaml_parser_t *parser)
+{
+ yaml_string_t string = { NULL, NULL, 0 };
+
+ string.buffer = yaml_malloc(YAML_DEFAULT_SIZE);
+ if (!string.buffer) {
+ parser->error = YAML_MEMORY_ERROR;
+ return string;
+ }
+
+ memset(string.buffer, 0, YAML_DEFAULT_SIZE);
+ string.pointer = string.buffer;
+ string.size = YAML_DEFAULT_SIZE;
+
+ return string;
+}
+
+/*
+ * Double the size of a string.
+ */
+
+static int
+yaml_parser_resize_string(yaml_parser_t *parser, yaml_string_t *string)
+{
+ yaml_char_t *new_buffer = yaml_realloc(string->buffer, string->size*2);
+
+ if (!new_buffer) {
+ yaml_free(string->buffer);
+ string->buffer = NULL;
+ string->pointer = NULL;
+ string->size = 0;
+ parser->error = YAML_MEMORY_ERROR;
+ return 0;
+ }
+
+ memset(new_buffer+string->size, 0, string->size);
+
+ string->pointer = new_buffer + (string->buffer-string->pointer);
+ string->buffer = new_buffer;
+ string->size *= 2;
+
+ return 1;
+}
+
+/*
+ * Double a list.
+ */
+
+static int
+yaml_parser_resize_list(yaml_parser_t *parser, void **buffer, size_t *size,
+ size_t item_size)
+{
+ void *new_buffer = yaml_realloc(*buffer, item_size*(*size)*2);
+
+ if (!new_buffer) {
+ parser->error = YAML_MEMORY_ERROR;
+ return 0;
+ }
+
+ memset(new_buffer+(*size), 0, item_size*(*size));
+
+ *buffer = new_buffer;
+ *size *= 2;
+
+ return 1;
+}
+
/*
* Set the scanner error and return 0.
*/
{
/* Check if we need to resize the list. */
- if (parser->flow_level == parser->simple_keys_size-1)
- {
- yaml_simple_key_t **new_simple_keys =
- yaml_realloc(parser->simple_keys,
- sizeof(yaml_simple_key_t *) * parser->simple_keys_size * 2);
-
- if (!new_simple_keys) {
- parser->error = YAML_MEMORY_ERROR;
+ if (parser->flow_level == parser->simple_keys_size-1) {
+ if (!yaml_parser_resize_list(parser, (void **)&parser->simple_keys,
+ &parser->simple_keys_size, sizeof(yaml_simple_key_t *)))
return 0;
- }
-
- memset(new_simple_keys+parser->simple_keys_size, 0,
- sizeof(yaml_simple_key_t *)*parser->simple_keys_size);
-
- parser->simple_keys = new_simple_keys;
- parser->simple_keys_size *= 2;
}
/* Increase the flow level and reset the simple key. */
/* Check if we need to resize the queue. */
- if (parser->tokens_head == 0 && parser->tokens_tail == parser->tokens_size)
- {
- yaml_token_t **new_tokens = yaml_realloc(parser->tokens,
- sizeof(yaml_token_t *) * parser->tokens_size * 2);
-
- if (!new_tokens) {
- parser->error = YAML_MEMORY_ERROR;
+ if (parser->tokens_head == 0 && parser->tokens_tail == parser->tokens_size) {
+ if (!yaml_parser_resize_list(parser, (void **)&parser->tokens,
+ &parser->tokens_size, sizeof(yaml_token_t *)))
return 0;
- }
-
- memset(new_tokens+parser->tokens_size, 0,
- sizeof(yaml_token_t *)*parser->tokens_size);
-
- parser->tokens = new_tokens;
- parser->tokens_size *= 2;
}
/* Check if we need to move the queue to the beginning of the buffer. */
{
/* Check if we need to expand the indents stack. */
- if (parser->indents_length == parser->indents_size)
- {
- int *new_indents = yaml_realloc(parser->indents,
- sizeof(int) * parser->indents_size * 2);
-
- if (!new_indents) {
- parser->error = YAML_MEMORY_ERROR;
+ if (parser->indents_length == parser->indents_size) {
+ if (!yaml_parser_resize_list(parser, (void **)&parser->indents,
+ &parser->indents_size, sizeof(int)))
return 0;
- }
-
- memset(new_indents+parser->indents_size, 0,
- sizeof(int)*parser->indents_size);
-
- parser->indents = new_indents;
- parser->indents_size *= 2;
}
/*
/* Remove the simple key from the list. */
- if (!yaml_parser_remove_simple_key(parser)) return 0;
+ yaml_free(simple_key);
+ parser->simple_keys[parser->flow_level] = NULL;
/* A simple key cannot follow another simple key. */
return 0;
}
- /* Remove a potential simple key from the list. */
-
- if (!yaml_parser_remove_simple_key(parser)) return 0;
-
/* Simple keys after ':' are allowed in the block context. */
parser->simple_key_allowed = (!parser->flow_level);
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 (!UPDATE(parser, 1)) return 0;
+
+ if (parser->column == 0 && IS_BOM(parser))
+ FORWARD(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 (!UPDATE(parser, 1)) return 0;
+
+ while (CHECK(parser,' ') ||
+ ((parser->flow_level || !parser->simple_key_allowed) &&
+ CHECK(parser, '\t'))) {
+ FORWARD(parser);
+ if (!UPDATE(parser, 1)) return 0;
+ }
+
+ /* Eat a comment until a line break. */
+
+ if (CHECK(parser, '#')) {
+ while (!IS_BREAKZ(parser)) {
+ FORWARD(parser);
+ if (!UPDATE(parser, 1)) return 0;
+ }
+ }
+
+ /* If it is a line break, eat it. */
+
+ if (IS_BREAK(parser))
+ {
+ if (!UPDATE(parser, 2)) return 0;
+ FORWARD_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
+ * ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ */
+
+static yaml_token_t *
+yaml_parser_scan_directive(yaml_parser_t *parser)
+{
+ yaml_mark_t start_mark, end_mark;
+ yaml_char_t *name = NULL;
+ int major, minor;
+ yaml_char_t *handle = NULL, *prefix = NULL;
+ yaml_token_t *token = NULL;
+
+ /* Eat '%'. */
+
+ start_mark = yaml_parser_get_mark(parser);
+
+ FORWARD(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 = yaml_parser_get_mark(parser);
+
+ /* Create a VERSION-DIRECTIVE token. */
+
+ token = yaml_version_directive_token_new(major, minor,
+ start_mark, end_mark);
+ if (!token) goto error;
+ }
+
+ /* 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 = yaml_parser_get_mark(parser);
+
+ /* Create a TAG-DIRECTIVE token. */
+
+ token = yaml_tag_directive_token_new(handle, prefix,
+ start_mark, end_mark);
+ if (!token) goto error;
+ }
+
+ /* Unknown directive. */
+
+ else
+ {
+ yaml_parser_set_scanner_error(parser, "While scanning a directive",
+ start_mark, "found uknown directive name");
+ goto error;
+ }
+
+ /* Eat the rest of the line including any comments. */
+
+ while (IS_BLANK(parser)) {
+ FORWARD(parser);
+ if (!UPDATE(parser, 1)) goto error;
+ }
+
+ if (CHECK(parser, '#')) {
+ while (!IS_BREAKZ(parser)) {
+ FORWARD(parser);
+ if (!UPDATE(parser, 1)) goto error;
+ }
+ }
+
+ /* Check if we are at the end of the line. */
+
+ if (!IS_BREAKZ(parser)) {
+ yaml_parser_set_scanner_error(parser, "While scanning a directive",
+ start_mark, "did not found expected comment or line break");
+ goto error;
+ }
+
+ /* Eat a line break. */
+
+ if (IS_BREAK(parser)) {
+ if (!UPDATE(parser, 2)) goto error;
+ FORWARD_LINE(parser);
+ }
+
+ yaml_free(name);
+
+ return token;
+
+error:
+ yaml_free(token);
+ yaml_free(prefix);
+ yaml_free(handle);
+ yaml_free(name);
+ return NULL;
+}
+
+/*
+ * 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 = yaml_parser_new_string(parser);
+
+ if (!string.buffer) goto error;
+
+ /* Consume the directive name. */
+
+ if (!UPDATE(parser, 1)) goto error;
+
+ while (IS_ALPHA(parser))
+ {
+ if (!RESIZE(parser, string)) goto error;
+ COPY(parser, string);
+ if (!UPDATE(parser, 1)) goto error;
+ }
+
+ /* Check if the name is empty. */
+
+ if (string.buffer == string.pointer) {
+ yaml_parser_set_scanner_error(parser, "while scanning a directive",
+ start_mark, "cannot found expected directive name");
+ goto error;
+ }
+
+ /* Check for an blank character after the name. */
+
+ if (!IS_BLANKZ(parser)) {
+ yaml_parser_set_scanner_error(parser, "while scanning a directive",
+ start_mark, "found unexpected non-alphabetical character");
+ goto error;
+ }
+
+ *name = string.buffer;
+
+ return 1;
+
+error:
+ yaml_free(string.buffer);
+ 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 (!UPDATE(parser, 1)) return 0;
+
+ while (IS_BLANK(parser)) {
+ FORWARD(parser);
+ if (!UPDATE(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, '.')) {
+ return yaml_parser_set_scanner_error(parser, "while scanning a %YAML directive",
+ start_mark, "did not find expected digit or '.' character");
+ }
+
+ FORWARD(parser);
+
+ /* Consume the minor version number. */
+
+ if (!yaml_parser_scan_version_directive_number(parser, start_mark, minor))
+ return 0;
+}
+
+#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 (!UPDATE(parser, 1)) return 0;
+
+ while (IS_DIGIT(parser))
+ {
+ /* 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);
+
+ FORWARD(parser);
+
+ if (!UPDATE(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 (!UPDATE(parser, 1)) goto error;
+
+ while (IS_BLANK(parser)) {
+ FORWARD(parser);
+ if (!UPDATE(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 (!UPDATE(parser, 1)) goto error;
+
+ if (!IS_BLANK(parser)) {
+ 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)) {
+ FORWARD(parser);
+ if (!UPDATE(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 (!UPDATE(parser, 1)) goto error;
+
+ if (!IS_BLANKZ(parser)) {
+ 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 yaml_token_t *
+yaml_parser_scan_anchor(yaml_parser_t *parser,
+ yaml_token_type_t type)
+{
+ int length = 0;
+ yaml_mark_t start_mark, end_mark;
+ yaml_token_t *token = NULL;
+ yaml_string_t string = yaml_parser_new_string(parser);
+
+ if (!string.buffer) goto error;
+
+ /* Eat the indicator character. */
+
+ start_mark = yaml_parser_get_mark(parser);
+
+ FORWARD(parser);
+
+ /* Consume the value. */
+
+ if (!UPDATE(parser, 1)) goto error;
+
+ while (IS_ALPHA(parser)) {
+ if (!RESIZE(parser, string)) goto error;
+ COPY(parser, string);
+ if (!UPDATE(parser, 1)) goto error;
+ length ++;
+ }
+
+ end_mark = yaml_parser_get_mark(parser);
+
+ /*
+ * 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) || CHECK(parser, '?') || CHECK(parser, ':') ||
+ CHECK(parser, ',') || CHECK(parser, ']') || CHECK(parser, '}') ||
+ CHECK(parser, '%') || CHECK(parser, '@') || CHECK(parser, '`'))) {
+ 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. */
+
+ token = type == YAML_ANCHOR_TOKEN ?
+ yaml_anchor_token_new(string.buffer, start_mark, end_mark) :
+ yaml_alias_token_new(string.buffer, start_mark, end_mark);
+ if (!token) goto error;
+
+ return token;
+
+error:
+ yaml_free(string.buffer);
+ yaml_free(token);
+ return 0;
+}
+
+/*
+ * Scan a TAG token.
+ */
+
+static yaml_token_t *
+yaml_parser_scan_tag(yaml_parser_t *parser)
+{
+ yaml_char_t *handle = NULL;
+ yaml_char_t *suffix = NULL;
+ yaml_token_t *token = NULL;
+ yaml_mark_t start_mark, end_mark;
+
+ start_mark = yaml_parser_get_mark(parser);
+
+ /* Check if the tag is in the canonical form. */
+
+ if (!UPDATE(parser, 2)) goto error;
+
+ if (CHECK_AT(parser, '<', 1))
+ {
+ /* Set the handle to '' */
+
+ handle = yaml_malloc(1);
+ if (!handle) goto error;
+ handle[0] = '\0';
+
+ /* Eat '!<' */
+
+ FORWARD(parser);
+ FORWARD(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, '>')) {
+ yaml_parser_set_scanner_error(parser, "while scanning a tag",
+ start_mark, "did not find the expected '>'");
+ goto error;
+ }
+
+ FORWARD(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';
+ }
+ }
+
+ /* Check the character which ends the tag. */
+
+ if (!UPDATE(parser, 1)) goto error;
+
+ if (!IS_BLANKZ(parser)) {
+ yaml_parser_set_scanner_error(parser, "while scanning a tag",
+ start_mark, "did not found expected whitespace or line break");
+ goto error;
+ }
+
+ end_mark = yaml_parser_get_mark(parser);
+
+ /* Create a token. */
+
+ token = yaml_tag_token_new(handle, suffix, start_mark, end_mark);
+ if (!token) goto error;
+
+ return token;
+
+error:
+ yaml_free(handle);
+ yaml_free(suffix);
+ return NULL;
+}
+
+/*
+ * 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 = yaml_parser_new_string(parser);
+
+ if (!string.buffer) goto error;
+
+ /* Check the initial '!' character. */
+
+ if (!UPDATE(parser, 1)) goto error;
+
+ if (!CHECK(parser, '!')) {
+ 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. */
+
+ COPY(parser, string);
+
+ /* Copy all subsequent alphabetical and numerical characters. */
+
+ if (!UPDATE(parser, 1)) goto error;
+
+ while (IS_ALPHA(parser))
+ {
+ if (!RESIZE(parser, string)) goto error;
+ COPY(parser, string);
+ if (!UPDATE(parser, 1)) goto error;
+ }
+
+ /* Check if the trailing character is '!' and copy it. */
+
+ if (CHECK(parser, '!'))
+ {
+ if (!RESIZE(parser, string)) goto error;
+ COPY(parser, string);
+ }
+ else
+ {
+ /*
+ * It's 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) {
+ yaml_parser_set_scanner_error(parser, "while parsing a directive",
+ start_mark, "did not find expected '!'");
+ goto error;
+ }
+ }
+
+ *handle = string.buffer;
+
+ return 1;
+
+error:
+ yaml_free(string.buffer);
+ 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 = yaml_parser_new_string(parser);
+
+ if (!string.buffer) goto error;
+
+ /* Resize the string to include the head. */
+
+ while (string.size <= length) {
+ if (!yaml_parser_resize_string(parser, &string)) goto error;
+ }
+
+ /* Copy the head if needed. */
+
+ if (length) {
+ memcpy(string.buffer, head, length);
+ string.pointer += length;
+ }
+
+ /* Scan the tag. */
+
+ if (!UPDATE(parser, 1)) goto error;
+
+ /*
+ * The set of characters that may appear in URI is as follows:
+ *
+ * '0'-'9', 'A'-'Z', 'a'-'z', '_', '-', ';', '/', '?', ':', '@', '&',
+ * '=', '+', '$', ',', '.', '!', '~', '*', '\'', '(', ')', '[', ']',
+ * '%'.
+ */
+
+ while (IS_ALPHA(parser) || CHECK(parser, ';') || CHECK(parser, '/') ||
+ CHECK(parser, '?') || CHECK(parser, ':') || CHECK(parser, '@') ||
+ CHECK(parser, '&') || CHECK(parser, '=') || CHECK(parser, '+') ||
+ CHECK(parser, '$') || CHECK(parser, ',') || CHECK(parser, '.') ||
+ CHECK(parser, '!') || CHECK(parser, '~') || CHECK(parser, '*') ||
+ CHECK(parser, '\'') || CHECK(parser, '(') || CHECK(parser, ')') ||
+ CHECK(parser, '[') || CHECK(parser, ']') || CHECK(parser, '%'))
+ {
+ if (!RESIZE(parser, string)) goto error;
+
+ /* Check if it is a URI-escape sequence. */
+
+ if (CHECK(parser, '%')) {
+ if (!yaml_parser_scan_uri_escapes(parser,
+ directive, start_mark, &string)) goto error;
+ }
+ else {
+ COPY(parser, string);
+ }
+
+ length ++;
+ if (!UPDATE(parser, 1)) goto error;
+ }
+
+ /* Check if the tag is non-empty. */
+
+ if (!length) {
+ 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.buffer;
+
+ return 1;
+
+error:
+ yaml_free(string.buffer);
+ 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 (!UPDATE(parser, 3)) return 0;
+
+ if (!(CHECK(parser, '%') && IS_HEX_AT(parser, 1) && IS_HEX_AT(parser, 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, 1) << 4) + AS_HEX_AT(parser, 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;
+ FORWARD(parser);
+ FORWARD(parser);
+ FORWARD(parser);
+
+ } while (--width);
+
+ return 1;
+}
+
andersk / libyaml.git / blobdiff