style.h

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#ifndef LH_STYLE_H
#define LH_STYLE_H
 
#include "css_tokenizer.h"
 
namespace litehtml
{
    struct invalid {}; // indicates "not found" condition in style::get_property
    struct inherit {}; // "inherit" was specified as the value of this property
 
    struct property_value : variant<
        invalid,
        inherit,
        int,
        int_vector,
        css_length,
        length_vector,
        float,
        web_color,
        vector<image>,
        string,
        string_vector,
        size_vector,
        css_token_vector
    >
    {
        bool m_important = false;
        bool m_has_var   = false; // css_token_vector, parsing is delayed because of var()
 
        property_value() {}
        template<class T> property_value(const T& val, bool important, bool has_var = false) 
            : base(val), m_important(important), m_has_var(has_var) {}
    };
 
    class html_tag;
    typedef std::map<string_id, property_value> props_map;
 
    // represents a style block, eg. "color: black; display: inline"
    class style
    {
    public:
        typedef std::shared_ptr<style>      ptr;
        typedef std::vector<style::ptr>     vector;
    private:
        props_map                           m_properties;
        static std::map<string_id, string>  m_valid_values;
    public:
        void add(const css_token_vector& tokens, const string& baseurl = "", document_container* container = nullptr);
        void add(const string& txt,              const string& baseurl = "", document_container* container = nullptr);
 
        void add_property(string_id name, const css_token_vector& tokens, const string& baseurl = "", bool important = false, document_container* container = nullptr);
        void add_property(string_id name, const string& val,              const string& baseurl = "", bool important = false, document_container* container = nullptr);
 
        const property_value& get_property(string_id name) const;
 
        void combine(const style& src);
        void clear()
        {
            m_properties.clear();
        }
 
        void subst_vars(const html_tag* el);
 
    private:
        void inherit_property(string_id name, bool important);
 
        void parse_background(const css_token_vector& tokens, const string& baseurl, bool important, document_container* container);
        bool parse_bg_layer(const css_token_vector& tokens, document_container* container, background& bg, bool final_layer);
        // parse the value of background-image property, which is comma-separated list of <bg-image>s
        void parse_background_image(const css_token_vector& tokens, const string& baseurl, bool important, document_container* container);
 
        // parse comma-separated list of keywords
        void parse_keyword_comma_list(string_id name, const css_token_vector& tokens, bool important);
        void parse_background_position(const css_token_vector& tokens, bool important);
        void parse_background_size(const css_token_vector& tokens, bool important);
        
        void parse_border(const css_token_vector& tokens, bool important, document_container* container);
        void parse_border_side(string_id name, const css_token_vector& tokens, bool important, document_container* container);
        void parse_border_radius(const css_token_vector& tokens, bool important);
        
        bool parse_list_style_image(const css_token& tok, string& url);
        void parse_list_style(const css_token_vector& tokens, string baseurl, bool important);
 
        void parse_font(css_token_vector tokens, bool important);
        
        void parse_flex_flow(const css_token_vector& tokens, bool important);
        void parse_flex(const css_token_vector& tokens, bool important);
        void parse_align_self(string_id name, const css_token_vector& tokens, bool important);
        
        void add_parsed_property(string_id name, const property_value& propval);
        void add_length_property(string_id name, css_token val, string keywords, int options, bool important);
        template<class T> void add_four_properties(string_id top_name, T val[4], int n, bool important);
        void remove_property(string_id name, bool important);
    };
    
    bool parse_url(const css_token& token, string& url);
    bool parse_length(const css_token& tok, css_length& length, int options, string keywords = "");
    bool parse_angle(const css_token& tok, float& angle, bool percents_allowed = false);
    bool parse_bg_position(const css_token_vector& tokens, int& index, css_length& x, css_length& y, bool convert_keywords_to_percents);
 
    template<typename Enum>
    bool parse_keyword(const css_token& tok, Enum& val, string keywords, int first_keyword_value = 0)
    {
        int value_index(const string& val, const string& strings, int defValue = -1, char delim = ';');
        int idx = value_index(tok.ident(), keywords);
        if (idx == -1) return false;
        val = (Enum)(first_keyword_value + idx);
        return true;
    }
 
} // namespace litehtml
 
#endif  // LH_STYLE_H