qt-creator/src/libs/cplusplus/pp-engine.h

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/*
  Copyright 2005 Roberto Raggi <roberto@kdevelop.org>

  Permission to use, copy, modify, distribute, and sell this software and its
  documentation for any purpose is hereby granted without fee, provided that
  the above copyright notice appear in all copies and that both that
  copyright notice and this permission notice appear in supporting
  documentation.

  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
  KDEVELOP TEAM 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_PP_ENGINE_H
#define CPLUSPLUS_PP_ENGINE_H

#include "PPToken.h"
#include "PreprocessorClient.h"

#include <Lexer.h>
#include <Token.h>
#include <QVector>
#include <QBitArray>
#include <QByteArray>

namespace CPlusPlus {

class Environment;

namespace Internal {
class PPToken;
struct TokenBuffer;
struct Value;
}

class CPLUSPLUS_EXPORT Preprocessor
{
    typedef Internal::PPToken PPToken;
    typedef Internal::Value Value;

public:
    Preprocessor(Client *client, Environment *env);

    QByteArray operator()(const QString &filename, const QString &source);
    QByteArray operator()(const QString &filename, const QByteArray &source, bool noLines = false, bool markGeneratedTokens = true);

    void preprocess(const QString &filename,
                    const QByteArray &source,
                    QByteArray *result, bool noLines, bool markGeneratedTokens, bool inCondition);

    bool expandMacros() const;
    void setExpandMacros(bool expandMacros);

    bool keepComments() const;
    void setKeepComments(bool keepComments);

private:
    enum { MAX_LEVEL = 512 };

    struct State {
        State();

        QString m_currentFileName;

        QByteArray m_source;
        Lexer *m_lexer;
        QBitArray m_skipping;
        QBitArray m_trueTest;
        int m_ifLevel;
        Internal::TokenBuffer *m_tokenBuffer;
        bool m_inPreprocessorDirective;

        QByteArray *m_result;
        bool m_markGeneratedTokens;

        bool m_noLines;
        bool m_inCondition;
        bool m_inDefine;
    };

    void handleDefined(PPToken *tk);
    void pushToken(PPToken *tk);
    void lex(PPToken *tk);
    void skipPreprocesorDirective(PPToken *tk);
    bool handleIdentifier(PPToken *tk);
    bool handleFunctionLikeMacro(PPToken *tk, const Macro *macro, QVector<PPToken> &body, bool addWhitespaceMarker);

    bool skipping() const
    { return m_state.m_skipping[m_state.m_ifLevel]; }

    QVector<CPlusPlus::Token> tokenize(const QByteArray &text) const;

    bool collectActualArguments(PPToken *tk, QVector<QVector<PPToken> > *actuals);
    void scanActualArgument(PPToken *tk, QVector<PPToken> *tokens);

    void handlePreprocessorDirective(PPToken *tk);
    void handleIncludeDirective(PPToken *tk);
    void handleDefineDirective(PPToken *tk);
    QByteArray expand(PPToken *tk, PPToken *lastConditionToken = 0);
    const Internal::PPToken evalExpression(PPToken *tk, Value &result);
    void handleIfDirective(PPToken *tk);
    void handleElifDirective(PPToken *tk, const PPToken &poundToken);
    void handleElseDirective(PPToken *tk, const PPToken &poundToken);
    void handleEndIfDirective(PPToken *tk, const PPToken &poundToken);
    void handleIfDefDirective(bool checkUndefined, PPToken *tk);
    void handleUndefDirective(PPToken *tk);

    static bool isQtReservedWord(const Internal::ByteArrayRef &name);

    void pushState(const State &newState);
    void popState();

    State createStateFromSource(const QString &fileName, const QByteArray &source, QByteArray *result, bool noLines, bool markGeneratedTokens, bool inCondition) const;

    inline bool atStartOfOutputLine() const
    { return (m_state.m_result && !m_state.m_result->isEmpty()) ? m_state.m_result->end()[-1] == '\n' : true; }

    inline void startNewOutputLine() const
    {
        if (m_state.m_result && !m_state.m_result->isEmpty() && m_state.m_result->end()[-1] != '\n')
            out('\n');
    }

    inline void out(const QByteArray &text) const
    { if (m_state.m_result) m_state.m_result->append(text); }

    inline void out(char ch) const
    { if (m_state.m_result) m_state.m_result->append(ch); }

    inline void out(const char *s) const
    { if (m_state.m_result) m_state.m_result->append(s); }

    inline void out(const Internal::ByteArrayRef &ref) const
    { if (m_state.m_result) m_state.m_result->append(ref.start(), ref.length()); }

    QString string(const char *first, int len) const;

    PPToken generateToken(enum Kind kind, const Internal::ByteArrayRef &content, unsigned lineno, bool addQuotes);
    PPToken generateConcatenated(const PPToken &leftTk, const PPToken &rightTk);

    void startSkippingBlocks(const PPToken &tk) const;

private:
    Client *m_client;
    Environment *m_env;
    QByteArray m_scratchBuffer;

    QList<State> m_savedStates;

    QString m_originalSource;
    bool m_expandMacros;
    bool m_keepComments;

    State m_state;
};

} // namespace CPlusPlus

#endif // CPLUSPLUS_PP_ENGINE_H