/****************************************************************************
**
** Copyright (C) 1992-2009 Nokia. All rights reserved.
** Copyright 2005 Harald Fernengel <harry@kdevelop.org>
**
** This file is part of Qt Jambi.
**
** Commercial Usage
Licensees holding valid Qt Commercial licenses may use this file in
accordance with the Qt Commercial License Agreement provided with the
Software or, alternatively, in accordance with the terms contained in
a written agreement between you and Nokia.

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Alternatively, this file may be used under the terms of the GNU Lesser
General Public License version 2.1 as published by the Free Software
Foundation and 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
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In addition, as a special exception, Nokia gives you certain
additional rights. These rights are described in the Nokia Qt LGPL
Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
package.

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Alternatively, this file may be used under the terms of the GNU
General Public License version 3.0 as published by the Free Software
Foundation and appearing in the file LICENSE.GPL included in the
packaging of this file.  Please review the following information to
ensure the GNU General Public License version 3.0 requirements will be
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**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
****************************************************************************/

#include "preprocessor.h"

#include <string>

// register callback for include hooks
static void includeFileHook(const std::string &, const std::string &, FILE *);

#define PP_HOOK_ON_FILE_INCLUDED(A, B, C) includeFileHook(A, B, C)
#include "pp.h"

using namespace rpp;

#include <QtCore/QtCore>

class PreprocessorPrivate
{
public:
    QByteArray result;
    pp_environment env;
    QStringList includePaths;

    void initPP(pp &proc)
    {
        foreach(QString path, includePaths)
            proc.push_include_path(path.toStdString());
    }
};

QHash<QString, QStringList> includedFiles;

void includeFileHook(const std::string &fileName, const std::string &filePath, FILE *)
{
    includedFiles[QString::fromStdString(fileName)].append(QString::fromStdString(filePath));
}

Preprocessor::Preprocessor()
{
    d = new PreprocessorPrivate;
    includedFiles.clear();
}

Preprocessor::~Preprocessor()
{
    delete d;
}

void Preprocessor::processFile(const QString &fileName)
{
    pp proc(d->env);
    d->initPP(proc);

    d->result.reserve(d->result.size() + 20 * 1024);

    d->result += "# 1 \"" + fileName.toLatin1() + "\"\n"; // ### REMOVE ME
    proc.file(fileName.toLocal8Bit().constData(), std::back_inserter(d->result));
}

void Preprocessor::processString(const QByteArray &str)
{
    pp proc(d->env);
    d->initPP(proc);

    proc(str.begin(), str.end(), std::back_inserter(d->result));
}

QByteArray Preprocessor::result() const
{
    return d->result;
}

void Preprocessor::addIncludePaths(const QStringList &includePaths)
{
    d->includePaths += includePaths;
}

QStringList Preprocessor::macroNames() const
{
    QStringList macros;

    pp_environment::const_iterator it = d->env.first_macro();
    while (it != d->env.last_macro()) {
        const pp_macro *m = *it;
        macros += QString::fromLatin1(m->name->begin(), m->name->size());
        ++it;
    }

    return macros;
}

QList<Preprocessor::MacroItem> Preprocessor::macros() const
{
    QList<MacroItem> items;

    pp_environment::const_iterator it = d->env.first_macro();
    while (it != d->env.last_macro()) {
        const pp_macro *m = *it;
        MacroItem item;
        item.name = QString::fromLatin1(m->name->begin(), m->name->size());
        item.definition = QString::fromLatin1(m->definition->begin(),
                                              m->definition->size());
        for (size_t i = 0; i < m->formals.size(); ++i) {
            item.parameters += QString::fromLatin1(m->formals[i]->begin(),
                    m->formals[i]->size());
        }
        item.isFunctionLike = m->function_like;

#ifdef PP_WITH_MACRO_POSITION
        item.fileName = QString::fromLatin1(m->file->begin(), m->file->size());
#endif
        items += item;

        ++it;
    }

    return items;
}

/*
int main()
{
    Preprocessor pp;

    QStringList paths;
    paths << "/usr/include";
    pp.addIncludePaths(paths);

    pp.processFile("pp-configuration");
    pp.processFile("/usr/include/stdio.h");

    qDebug() << pp.result();

    return 0;
}
*/