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#include "../include/quickmedia/XpathParser.h"
#include "../include/quickmedia/XpathTokenizer.h"
#include <stdlib.h>
typedef struct {
QuickMediaXpathTokenizer tokenizer;
} QuickMediaXpathParser;
static void quickmedia_xpath_parser_init(QuickMediaXpathParser *self, const char *xpath) {
quickmedia_xpath_tokenizer_init(&self->tokenizer, xpath);
}
/* ('[' IDENTIFIER '=' '"' STRING '"' ']')? */
static int xpath_parse_param(QuickMediaXpathParser *self, QuickMediaNodeSearchParam *result) {
if(quickmedia_xpath_tokenizer_next_if(&self->tokenizer, QUICKMEDIA_XPATH_TOKEN_OPEN_BRACKET) != 0)
return 1;
QuickMediaXpathToken token = quickmedia_xpath_tokenizer_next(&self->tokenizer);
if(token != QUICKMEDIA_XPATH_TOKEN_IDENTIFIER)
return -1;
result->name = quickmedia_xpath_tokenizer_copy_identifier(&self->tokenizer);
token = quickmedia_xpath_tokenizer_next(&self->tokenizer);
if(token != QUICKMEDIA_XPATH_TOKEN_EQUAL)
return -2;
token = quickmedia_xpath_tokenizer_next(&self->tokenizer);
if(token != QUICKMEDIA_XPATH_TOKEN_STRING)
return -3;
result->value = quickmedia_xpath_tokenizer_copy_string(&self->tokenizer);
token = quickmedia_xpath_tokenizer_next(&self->tokenizer);
if(token != QUICKMEDIA_XPATH_TOKEN_CLOSING_BRACKET)
return -4;
return 0;
}
static int xpath_parse_node(QuickMediaXpathParser *self, QuickMediaNodeSearch *result) {
quickmedia_node_search_init(result);
QuickMediaXpathToken token = quickmedia_xpath_tokenizer_next(&self->tokenizer);
/* // or / */
if(token == QUICKMEDIA_XPATH_TOKEN_CHILD || token == QUICKMEDIA_XPATH_TOKEN_CHILD_RECURSIVE) {
result->recursive = (token == QUICKMEDIA_XPATH_TOKEN_CHILD_RECURSIVE);
token = quickmedia_xpath_tokenizer_next(&self->tokenizer);
if(token != QUICKMEDIA_XPATH_TOKEN_IDENTIFIER)
return -1;
result->name = quickmedia_xpath_tokenizer_copy_identifier(&self->tokenizer);
int param_result = xpath_parse_param(self, &result->param);
if(param_result < 0) {
quickmedia_node_search_deinit(result);
return param_result;
} else if(param_result == 0) {
result->param_defined = 1;
}
result->child = malloc(sizeof(QuickMediaNodeSearch));
int node_result = xpath_parse_node(self, result->child);
if(node_result > 0) {
node_result = 0;
/* Didn't have child, remove child */
free(result->child);
result->child = NULL;
} else if(node_result < 0) {
quickmedia_node_search_deinit(result);
}
return node_result;
} else if(token == QUICKMEDIA_XPATH_TOKEN_END_OF_FILE) {
return 1;
} else {
return -2;
}
}
int quickmedia_parse_xpath(const char *xpath, QuickMediaNodeSearch *result) {
QuickMediaXpathParser parser;
quickmedia_xpath_parser_init(&parser, xpath);
int parse_result = xpath_parse_node(&parser, result);
if(parse_result > 0)
parse_result = -1;
return parse_result;
}
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