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#include "../include/HtmlTree.h"
#include <stdlib.h>
#include <string.h>
#include <assert.h>
static void html_node_deinit(HtmlNode *self);
static void html_node_init(HtmlNode *self) {
self->name_or_value.data = NULL;
self->name_or_value.size = 0;
self->parent = NULL;
self->first_child = NULL;
self->last_child = NULL;
self->first_attr = NULL;
self->node_type = HTML_NODE_NODE;
}
/* |parent| can't be NULL */
static HtmlNode* html_node_create(HtmlStringView name_or_value, HtmlNode *parent, HtmlNodeType node_type) {
HtmlNodeChild *node_child = malloc(sizeof(HtmlNodeChild));
assert(parent);
if(!node_child)
return NULL;
node_child->node.name_or_value = name_or_value;
node_child->node.parent = parent;
node_child->node.first_child = NULL;
node_child->node.last_child = NULL;
node_child->node.first_attr = NULL;
node_child->node.node_type = node_type;
node_child->next = NULL;
if(!parent->first_child) {
parent->first_child = node_child;
parent->last_child = node_child;
} else {
parent->last_child->next = node_child;
parent->last_child = node_child;
}
return &node_child->node;
}
static void html_node_child_deinit(HtmlNodeChild *self) {
html_node_deinit(&self->node);
if(self->next) {
html_node_child_deinit(self->next);
free(self->next);
self->next = NULL;
}
}
static void html_attribute_deinit(HtmlAttribute *self) {
if(self->next) {
html_attribute_deinit(self->next);
free(self->next);
self->next = NULL;
}
}
void html_node_deinit(HtmlNode *self) {
self->name_or_value.data = NULL;
self->name_or_value.size = 0;
self->parent = NULL;
if(self->first_child) {
html_node_child_deinit(self->first_child);
free(self->first_child);
self->first_child = NULL;
self->last_child = NULL;
}
if(self->first_attr) {
html_attribute_deinit(self->first_attr);
free(self->first_attr);
self->first_attr = NULL;
}
}
typedef struct {
HtmlNode *root_node;
HtmlNode *current_node;
HtmlAttribute *current_node_last_attribute;
} ParseUserdata;
static int parse_callback(HtmlParser *html_parser, HtmlParseType parse_type, void *userdata) {
ParseUserdata *parse_userdata = userdata;
switch(parse_type) {
case HTML_PARSE_TAG_START: {
HtmlNode *new_node = html_node_create(html_parser->tag_name, parse_userdata->current_node, HTML_NODE_NODE);
if(!new_node)
return 1;
parse_userdata->current_node = new_node;
parse_userdata->current_node_last_attribute = NULL;
break;
}
case HTML_PARSE_TAG_END: {
HtmlNode *parent_node = parse_userdata->current_node->parent;
if(parent_node && parent_node != parse_userdata->root_node) {
parse_userdata->current_node = parent_node;
parse_userdata->current_node_last_attribute = NULL;
}
break;
}
case HTML_PARSE_ATTRIBUTE: {
HtmlAttribute *new_attr = malloc(sizeof(HtmlAttribute));
if(!new_attr)
return 1;
new_attr->key = html_parser->attribute_key;
new_attr->value = html_parser->attribute_value;
new_attr->next = NULL;
if(parse_userdata->current_node_last_attribute)
parse_userdata->current_node_last_attribute->next = new_attr;
else
parse_userdata->current_node->first_attr = new_attr;
parse_userdata->current_node_last_attribute = new_attr;
break;
}
case HTML_PARSE_TEXT:
case HTML_PARSE_JAVASCRIPT_CODE: {
HtmlNode *new_node;
if(html_parser->text_stripped.size == 0)
return 0;
new_node = html_node_create(html_parser->text_stripped, parse_userdata->current_node, parse_type == HTML_PARSE_TEXT ? HTML_NODE_TEXT : HTML_NODE_JS);
if(!new_node)
return 1;
parse_userdata->current_node_last_attribute = NULL;
break;
}
}
return 0;
}
int html_parse_to_tree(HtmlTree *self, const char *html_source, size_t len) {
int result;
ParseUserdata parse_userdata;
html_node_init(&self->root_node);
parse_userdata.root_node = &self->root_node;
parse_userdata.current_node = &self->root_node;
parse_userdata.current_node_last_attribute = NULL;
result = html_parser_parse(html_source, len, parse_callback, &parse_userdata);
if(result != 0)
html_tree_deinit(self);
return result;
}
void html_tree_deinit(HtmlTree *self) {
html_node_deinit(&self->root_node);
}
HtmlAttribute* html_node_get_attribute_by_name(HtmlNode *self, HtmlStringView name) {
HtmlAttribute *attr = self->first_attr;
for(; attr; attr = attr->next) {
if(html_string_view_equals_case_insensitive(&attr->key, &name))
return attr;
}
return NULL;
}
HtmlNode* html_node_find_child(HtmlNode *self, const char *tag_name, const char *attribute_name, const char *attribute_value) {
HtmlStringView tag;
HtmlStringView attr_name;
HtmlStringView attr_value;
HtmlNodeChild *child;
tag.data = tag_name;
tag.size = strlen(tag_name);
attr_name.data = attribute_name;
attr_name.size = strlen(attribute_name);
attr_value.data = attribute_value;
attr_value.size = strlen(attribute_value);
for(child = self->first_child; child; child = child->next) {
HtmlAttribute *attr;
if(child->node.node_type != HTML_NODE_NODE)
continue;
if(!html_string_view_equals_case_insensitive(&child->node.name_or_value, &tag))
continue;
attr = html_node_get_attribute_by_name(&child->node, attr_name);
if(!attr)
continue;
if(html_string_view_equals_case_insensitive(&attr->value, &attr_value))
return &child->node;
}
return NULL;
}
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