#ifndef HTML_PARSER_H
#define HTML_PARSER_H

/*
    A small html parser with no dependencies and doesn't dynamically allocate any memory
    and can parse and repair broken html (just like web browsers)
*/

#include <stddef.h>

typedef struct {
    const char *data;
    size_t size;
} HtmlStringView;

typedef struct HtmlParser HtmlParser;

typedef enum{
    HTML_PARSE_TAG_START,
    HTML_PARSE_TAG_END,
    HTML_PARSE_ATTRIBUTE,
    HTML_PARSE_TEXT,
    HTML_PARSE_JAVASCRIPT_CODE
} HtmlParseType;

typedef void (*HtmlParseCallback)(HtmlParser *html_parser, HtmlParseType parse_type, void *userdata);

#define UNCLOSED_TAGS_SIZE 2048

struct HtmlParser {
    const char *source;
    size_t source_len;
    size_t offset;
    HtmlParseCallback parse_callback;
    void *callback_userdata;

    HtmlStringView tag_name;
    HtmlStringView attribute_key;
    HtmlStringView attribute_value;
    HtmlStringView text;
    /* Only used when parse_type is HTML_PARSE_TEXT */
    HtmlStringView text_stripped;

    int is_tag_void;
    int inside_script_tag;

    size_t unclosed_tags_offset;
    HtmlStringView unclosed_tags[UNCLOSED_TAGS_SIZE];
};

/* Note: HTML_PARSE_TAG_START is guaranteed to be called for a tag before HTML_PARSE_TAG_END */
void html_parser_init(HtmlParser *self, const char *html_source, size_t len, HtmlParseCallback parse_callback, void *userdata);
void html_parser_deinit(HtmlParser *self);

void html_parser_parse(HtmlParser *self);

#endif /* HTML_PARSER_H */