UIStyleSheet.h

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#pragma once
 
#include "UI/UITypes.h"
 
#include <string>
#include <vector>
 
//------------------------------------------------------------
// CSS Selector
//------------------------------------------------------------
 
enum class CSSSelectorType : uint8_t
{
    Element,    // div, button, etc.  (specificity 1)
    Class,      // .classname         (specificity 10)
    Id          // #idname            (specificity 100)
};
 
struct CSSSelector
{
    CSSSelectorType mType = CSSSelectorType::Element;
    std::string mValue;
 
    int32_t GetSpecificity() const;
};
 
//------------------------------------------------------------
// CSS Rule
//------------------------------------------------------------
 
struct CSSProperty
{
    std::string mName;
    CSSValue mValue;
};
 
struct CSSRule
{
    CSSSelector mSelector;
    std::vector<CSSProperty> mProperties;
};
 
//------------------------------------------------------------
// UIStyleSheet
//------------------------------------------------------------
 
class UIStyleSheet
{
public:
 
    void Parse(const std::string& cssSource);
    void ParseAndAppend(const std::string& cssSource);
    void Clear();
 
    void GetMatchingRules(
        const char* elementType,
        const char* className,
        const char* id,
        std::vector<const CSSRule*>& outRules) const;
 
    void ApplyStyles(
        Widget* widget,
        const char* elementType,
        const char* className,
        const char* id) const;
 
private:
 
    std::vector<CSSRule> mRules;
 
    static void SkipWhitespace(const char*& cursor);
    static void SkipComments(const char*& cursor);
    static void SkipWhitespaceAndComments(const char*& cursor);
    static std::string ReadIdentifier(const char*& cursor);
    static std::string ReadUntil(const char*& cursor, char delim);
};