parcss1.hxx

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#ifndef INCLUDED_SW_SOURCE_FILTER_HTML_PARCSS1_HXX
#define INCLUDED_SW_SOURCE_FILTER_HTML_PARCSS1_HXX

#include <rtl/ustring.hxx>
#include <tools/color.hxx>

#include <memory>

// tokens of the CSS1 parser
enum CSS1Token
{
    CSS1_NULL,

    CSS1_IDENT,
    CSS1_STRING,
    CSS1_NUMBER,
    CSS1_PERCENTAGE,
    CSS1_LENGTH,    // absolute length in 1/100 MM
    CSS1_PIXLENGTH, // length in pixels
    CSS1_EMS,
    CSS1_EMX,
    CSS1_HEXCOLOR,

    CSS1_DOT_W_WS,
    CSS1_DOT_WO_WS,
    CSS1_COLON,
    CSS1_SLASH,
    CSS1_PLUS,
    CSS1_MINUS,
    CSS1_OBRACE,
    CSS1_CBRACE,
    CSS1_SEMICOLON,
    CSS1_COMMA,
    CSS1_HASH,

    CSS1_IMPORT_SYM,
    CSS1_PAGE_SYM, // Feature: PrintExt

    CSS1_IMPORTANT_SYM,

    CSS1_URL,
    CSS1_RGB
};

enum CSS1ParserState
{
    CSS1_PAR_ACCEPTED = 0,
    CSS1_PAR_WORKING
};

enum CSS1SelectorType
{
    CSS1_SELTYPE_ELEMENT,
    CSS1_SELTYPE_ELEM_CLASS,
    CSS1_SELTYPE_CLASS,
    CSS1_SELTYPE_ID,
    CSS1_SELTYPE_PSEUDO,
    CSS1_SELTYPE_PAGE // Feature: PrintExt
};

class CSS1Selector
{
    CSS1SelectorType const eType; // the type
    OUString const aSelector;     // the selector itself
    CSS1Selector *pNext;    // the following component

public:
    CSS1Selector( CSS1SelectorType eTyp, const OUString &rSel )
        : eType(eTyp), aSelector( rSel ), pNext( nullptr )
    {}

    ~CSS1Selector();

    CSS1SelectorType GetType() const { return eType; }
    const OUString& GetString() const { return aSelector; }

    void SetNext( CSS1Selector *pNxt ) { pNext = pNxt; }
    const CSS1Selector *GetNext() const { return pNext; }
};

struct CSS1Expression
{
    sal_Unicode cOp; // type of the link with its predecessor
    CSS1Token eType; // type of the expression
    OUString aValue; // value as string
    double nValue;   // value as number (TWIPs for LENGTH)
    CSS1Expression *pNext; // the following component

public:
    CSS1Expression( CSS1Token eTyp, const OUString &rVal,
                    double nVal, sal_Unicode cO = 0 )
        : cOp(cO), eType(eTyp), aValue(rVal), nValue(nVal), pNext(nullptr)
    {}

    ~CSS1Expression();

    inline void Set( CSS1Token eTyp, const OUString &rVal, double nVal );

    CSS1Token GetType() const { return eType; }
    const OUString& GetString() const { return aValue; }
    double GetNumber() const { return nValue; }
    inline sal_uInt32 GetULength() const;
    inline sal_Int32 GetSLength() const;
    sal_Unicode GetOp() const { return cOp; }

    void GetURL( OUString& rURL ) const;
    bool GetColor( Color &rRGB ) const;

    void SetNext( CSS1Expression *pNxt ) { pNext = pNxt; }
    const CSS1Expression *GetNext() const { return pNext; }
};

inline void CSS1Expression::Set( CSS1Token eTyp, const OUString &rVal,
                                 double nVal )
{
    cOp = 0; eType = eTyp; aValue = rVal; nValue = nVal; pNext = nullptr;
}

inline sal_uInt32 CSS1Expression::GetULength() const
{
    return nValue < 0. ? 0UL : static_cast<sal_uInt32>(nValue + .5);
}

inline sal_Int32 CSS1Expression::GetSLength() const
{
    return static_cast<sal_Int32>(nValue + (nValue < 0. ? -.5 : .5 ));
}

class CSS1Parser
{
    bool m_bWhiteSpace : 1; // read a whitespace?
    bool m_bEOF : 1; // is end of "file"?

    sal_Unicode m_cNextCh; // next character

    sal_Int32 m_nInPos; // current position in the input string

    sal_uInt32 m_nlLineNr; // current row number
    sal_uInt32 m_nlLinePos; // current column number

    double m_nValue; // value of the token as number

    CSS1ParserState m_eState; // current state of the parser
    CSS1Token m_nToken; // the current token

    OUString m_aIn; // the string to parse
    OUString m_aToken; // token as string

    void InitRead( const OUString& rIn );

    sal_Unicode GetNextChar();

    CSS1Token GetNextToken();

    bool IsParserWorking() const { return CSS1_PAR_WORKING == m_eState; }

    bool IsEOF() const { return m_bEOF; }

    // parse parts of the grammar
    void ParseRule();
    std::unique_ptr<CSS1Selector> ParseSelector();
    std::unique_ptr<CSS1Expression> ParseDeclaration( OUString& rProperty );

protected:
    void ParseStyleSheet();

    void ParseStyleSheet( const OUString& rIn );

    void ParseStyleOption( const OUString& rIn );

    virtual void SelectorParsed( std::unique_ptr<CSS1Selector> pSelector, bool bFirst );

    virtual void DeclarationParsed( const OUString& rProperty,
                                    std::unique_ptr<CSS1Expression> pExpr );

public:
    CSS1Parser();
    virtual ~CSS1Parser();
};

#endif

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