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// Copyright (c) 2008 Roberto Raggi <roberto.raggi@gmail.com>

//

// Permission is hereby granted, free of charge, to any person obtaining a copy

// of this software and associated documentation files (the "Software"), to deal

// in the Software without restriction, including without limitation the rights

// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

// copies of the Software, and to permit persons to whom the Software is

// furnished to do so, subject to the following conditions:

//

// The above copyright notice and this permission notice shall be included in

// all copies or substantial portions of the Software.

//

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

// THE SOFTWARE.

#ifndef CPLUSPLUS_LEXER_H

#define CPLUSPLUS_LEXER_H

#include "CPlusPlusForwardDeclarations.h"

#include "Token.h"

namespace CPlusPlus {

class CPLUSPLUS_EXPORT Lexer

{

    Lexer(const Lexer &other);

    void operator =(const Lexer &other);

public:

    enum State {

        State_Default,

        State_MultiLineComment,

        State_MultiLineDoxyComment

    };

    Lexer(TranslationUnit *unit);

    Lexer(const char *firstChar, const char *lastChar);

    ~Lexer();

    Control *control() const;

    TranslationUnit *translationUnit() const;

    bool qtMocRunEnabled() const;

    void setQtMocRunEnabled(bool onoff);

    bool objCEnabled() const;

    void setObjCEnabled(bool onoff);

    void scan(Token *tok);

    inline void operator()(Token *tok)

    { scan(tok); }

    unsigned tokenOffset() const;

    unsigned tokenLength() const;

    const char *tokenBegin() const;

    const char *tokenEnd() const;

    unsigned currentLine() const;

    bool scanCommentTokens() const;

    void setScanCommentTokens(bool onoff);

    bool scanKeywords() const;

    void setScanKeywords(bool onoff);

    bool scanAngleStringLiteralTokens() const;

    void setScanAngleStringLiteralTokens(bool onoff);

    void setStartWithNewline(bool enabled);

    int state() const;

    void setState(int state);

    bool isIncremental() const;

    void setIncremental(bool isIncremental);

private:

    void scan_helper(Token *tok);

    void setSource(const char *firstChar, const char *lastChar);

    static int classify(const char *string, int length, bool q);

    static int classifyObjCAtKeyword(const char *s, int n);

    static int classifyOperator(const char *string, int length);

    inline void yyinp()

    {

        if (++_currentChar == _lastChar)

            _yychar = 0;

        else {

            _yychar = *_currentChar;

            if (_yychar == '\n')

                pushLineStartOffset();

        }

    }

    void pushLineStartOffset();

private:

    struct Flags {

        unsigned _isIncremental: 1;

        unsigned _scanCommentTokens: 1;

        unsigned _scanKeywords: 1;

        unsigned _scanAngleStringLiteralTokens: 1;

        unsigned _qtMocRunEnabled: 1;

        unsigned _objCEnabled: 1;

    };

    TranslationUnit *_translationUnit;

    const char *_firstChar;

    const char *_currentChar;

    const char *_lastChar;

    const char *_tokenStart;

    unsigned char _yychar;

    int _state;

    union {

        unsigned _flags;

        Flags f;

    };

    unsigned _currentLine;

};

} // end of namespace CPlusPlus

#endif // CPLUSPLUS_LEXER_H