/**************************************************************************
**
** This file is part of Qt Creator
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** Copyright (c) 2011 Nokia Corporation and/or its subsidiary(-ies).
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** GNU Lesser General Public License Usage
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** appearing in the file LICENSE.LGPL included in the packaging of this file.
** Please review the following information to ensure the GNU Lesser General
** Public License version 2.1 requirements will be met:
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** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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#ifndef CPLUSPLUS_PREPROCESSOR_H
#define CPLUSPLUS_PREPROCESSOR_H

#include <CPlusPlusForwardDeclarations.h>
#include <iosfwd>
#include <vector>
#include <map>
#include <cstring>

namespace CPlusPlus {

class Lexer;
class Token;

class CPLUSPLUS_EXPORT StringRef
{
    const char *_text;
    unsigned _size;

public:
    typedef const char *iterator;
    typedef const char *const_iterator;

    StringRef()
        : _text(0), _size(0) {}

    StringRef(const char *text, unsigned size)
        : _text(text), _size(size) {}

    StringRef(const char *text)
        : _text(text), _size(std::strlen(text)) {}

    inline const char *text() const { return _text; }
    inline unsigned size() const { return _size; }

    inline const_iterator begin() const { return _text; }
    inline const_iterator end() const { return _text + _size; }

    bool operator == (const StringRef &other) const
    {
        if (_size == other._size)
            return _text == other._text || ! std::strncmp(_text, other._text, _size);

        return false;
    }

    bool operator != (const StringRef &other) const
    { return ! operator == (other); }

    bool operator < (const StringRef &other) const
    { return std::lexicographical_compare(begin(), end(), other.begin(), other.end()); }
};

class CPLUSPLUS_EXPORT Preprocessor
{
public:
    Preprocessor(std::ostream &out);

    void operator()(const char *source, unsigned size, const StringRef &currentFileName);

private:
    struct Macro
    {
        Macro(): isFunctionLike(false), isVariadic(false) {}

        std::vector<StringRef> formals;
        std::vector<Token> body;
        bool isFunctionLike: 1;
        bool isVariadic: 1;
    };

    void run(const char *source, unsigned size);

    Lexer *switchLexer(Lexer *lex);
    StringRef switchSource(const StringRef &source);

    const Macro *resolveMacro(const StringRef &name) const;

    StringRef asStringRef(const Token &tk) const;
    void lex(Token *tk);
    bool isValidToken(const Token &tk) const;

    void handlePreprocessorDirective(Token *tk);
    void handleDefineDirective(Token *tk);
    void skipPreprocesorDirective(Token *tk);

    void collectActualArguments(Token *tk, std::vector<std::vector<Token> > *actuals);
    void scanActualArgument(Token *tk, std::vector<Token> *tokens);

private:
    struct TokenBuffer;

    std::ostream &out;
    StringRef _currentFileName;
    Lexer *_lexer;
    StringRef _source;
    TokenBuffer *_tokenBuffer;
    bool inPreprocessorDirective: 1;
    std::map<StringRef, Macro> macros;
};

} // end of namespace CPlusPlus

CPLUSPLUS_EXPORT std::ostream &operator << (std::ostream &out, const CPlusPlus::StringRef &s);

#endif // CPLUSPLUS_PREPROCESSOR_H