/**
* Currently line and len are not being kept track of.
* Don't think pnode_length is needed as nodes track there list count
* internally.
*/
WEBVTT_INTERN webvtt_status
webvtt_parse_cuetext( webvtt_parser self, webvtt_cue *cue, webvtt_string *payload, int finished )
{
const webvtt_byte *cue_text;
webvtt_status status;
webvtt_byte *position;
webvtt_node *node_head;
webvtt_node *current_node;
webvtt_node *temp_node;
webvtt_cuetext_token *token;
webvtt_node_kind kind;
if( !cue ) {
return WEBVTT_INVALID_PARAM;
}
cue_text = webvtt_string_text( payload );
if( !cue_text ) {
return WEBVTT_INVALID_PARAM;
}
if ( WEBVTT_FAILED(status = webvtt_create_head_node( &cue->node_head ) ) ) {
return status;
}
position = (webvtt_byte *)cue_text;
node_head = cue->node_head;
current_node = node_head;
temp_node = NULL;
token = NULL;
/**
* Routine taken from the W3C specification
* http://dev.w3.org/html5/webvtt/#webvtt-cue-text-parsing-rules
*/
while( *position != UTF8_NULL_BYTE ) {
webvtt_delete_token( &token );
/* Step 7. */
switch( webvtt_cuetext_tokenizer( &position, &token ) ) {
case( WEBVTT_UNFINISHED ):
/* Error here. */
break;
/* Step 8. */
case( WEBVTT_SUCCESS ):
/**
* If we've found an end token which has a valid end token tag name and
* a tag name that is equal to the current node then set current to the
* parent of current.
*/
if( token->token_type == END_TOKEN ) {
/**
* We have encountered an end token but we are at the top of the list
* and thus have not encountered any start tokens yet, throw away the
* token.
*/
if( current_node->kind == WEBVTT_HEAD_NODE ) {
continue;
}
/**
* We have encountered an end token but it is not in a format that is
* supported, throw away the token.
*/
if( webvtt_node_kind_from_tag_name( &token->tag_name, &kind ) == WEBVTT_INVALID_TAG_NAME ) {
continue;
}
/**
* We have encountered an end token and it matches the start token of
* the node that we are currently on. Move back up the list of nodes
* and continue parsing.
*/
if( current_node->kind == kind ) {
current_node = current_node->parent;
}
} else {
/**
* Attempt to create a valid node from the token.
* If successful then attach the node to the current nodes list and
* also set current to the newly created node if it is an internal
* node type.
*/
if( webvtt_create_node_from_token( token, &temp_node, current_node ) != WEBVTT_SUCCESS ) {
/* Do something here? */
}
else {
webvtt_attach_node( current_node, temp_node );
if( WEBVTT_IS_VALID_INTERNAL_NODE( temp_node->kind ) ) {
current_node = temp_node;
}
/* Release the node as attach internal node increases the count. */
webvtt_release_node( &temp_node );
}
}
break;
}
webvtt_skipwhite( &position );
}
webvtt_delete_token( &token );
return WEBVTT_SUCCESS;
}
/**
* Currently line and len are not being kept track of.
* Don't think pnode_length is needed as nodes track there list count
* internally.
*/
WEBVTT_INTERN webvtt_status
webvtt_parse_cuetext( webvtt_parser self, webvtt_cue *cue, webvtt_string *payload, int finished )
{
const webvtt_byte *cue_text;
webvtt_status status;
webvtt_byte *position;
webvtt_node *node_head;
webvtt_node *current_node;
webvtt_node *temp_node;
webvtt_cuetext_token *token;
webvtt_node_kind kind;
/**
* TODO: Use these parameters! 'finished' isn't really important
* here, but 'self' certainly is as it lets us report syntax errors.
*
* However, for the time being we can trick the compiler into not
* warning us about unused variables by doing this.
*/
( void )self;
( void )finished;
if( !cue ) {
return WEBVTT_INVALID_PARAM;
}
cue_text = webvtt_string_text( payload );
if( !cue_text ) {
return WEBVTT_INVALID_PARAM;
}
if ( WEBVTT_FAILED(status = webvtt_create_head_node( &cue->node_head ) ) ) {
return status;
}
position = (webvtt_byte *)cue_text;
node_head = cue->node_head;
current_node = node_head;
temp_node = NULL;
token = NULL;
/**
* Routine taken from the W3C specification
* http://dev.w3.org/html5/webvtt/#webvtt-cue-text-parsing-rules
*/
while( *position != '\0' ) {
webvtt_status status = WEBVTT_SUCCESS;
webvtt_delete_token( &token );
/* Step 7. */
if( WEBVTT_FAILED( status = webvtt_cuetext_tokenizer( &position,
&token ) ) ) {
/* Error here. */
} else {
/* Succeeded... Process token */
if( token->token_type == END_TOKEN ) {
/**
* If we've found an end token which has a valid end token tag name and
* a tag name that is equal to the current node then set current to the
* parent of current.
*/
if( current_node->kind == WEBVTT_HEAD_NODE ) {
/**
* We have encountered an end token but we are at the top of the list
* and thus have not encountered any start tokens yet, throw away the
* token.
*/
continue;
}
if( webvtt_node_kind_from_tag_name( &token->tag_name, &kind ) == WEBVTT_INVALID_TAG_NAME ) {
/**
* We have encountered an end token but it is not in a format that is
* supported, throw away the token.
*/
continue;
}
if( current_node->kind == kind ) {
/**
* We have encountered an end token and it matches the start token of
* the node that we are currently on. Move back up the list of nodes
* and continue parsing.
*/
current_node = current_node->parent;
}
} else {
/**
* Attempt to create a valid node from the token.
* If successful then attach the node to the current nodes list and
* also set current to the newly created node if it is an internal
* node type.
*/
if( webvtt_create_node_from_token( token, &temp_node, current_node ) != WEBVTT_SUCCESS ) {
/* Do something here? */
} else {
webvtt_attach_node( current_node, temp_node );
if( WEBVTT_IS_VALID_INTERNAL_NODE( temp_node->kind ) ) {
current_node = temp_node;
}
/* Release the node as attach internal node increases the count. */
webvtt_release_node( &temp_node );
}
}
}
}
webvtt_delete_token( &token );
return WEBVTT_SUCCESS;
}