/****************************************************************************
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** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Qt Software Information (qt-info@nokia.com)
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** This file is part of the QtCore module of the Qt Toolkit.
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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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** Alternatively, this file may be used under the terms of the GNU
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** packaging of this file.  Please review the following information to
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****************************************************************************/

#ifndef QCORECMDLINEARGS_P_H
#define QCORECMDLINEARGS_P_H

//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//

#include "QtCore/qstring.h"
#include "QtCore/qstringlist.h"

QT_BEGIN_NAMESPACE

#if defined(Q_OS_WIN32) || defined(Q_OS_WINCE)

QT_BEGIN_INCLUDE_NAMESPACE
#include "QtCore/qvector.h"
#include "qt_windows.h"
QT_END_INCLUDE_NAMESPACE

// template implementation of the parsing algorithm
// this is used from qcoreapplication_win.cpp and the tools (rcc, uic...)

template<typename Char>
static QVector<Char*> qWinCmdLine(Char *cmdParam, int length, int &argc)
{
    QVector<Char*> argv(8);
    Char *p = cmdParam;
    Char *p_end = p + length;

    argc = 0;

    while (*p && p < p_end) {                                // parse cmd line arguments
        while (QChar((short)(*p)).isSpace())                          // skip white space
            p++;
        if (*p && p < p_end) {                                // arg starts
            int quote;
            Char *start, *r;
            if (*p == Char('\"') || *p == Char('\'')) {        // " or ' quote
                quote = *p;
                start = ++p;
            } else {
                quote = 0;
                start = p;
            }
            r = start;
            while (*p && p < p_end) {
                if (quote) {
                    if (*p == quote) {
                        p++;
                        if (QChar((short)(*p)).isSpace())
                            break;
                        quote = 0;
                    }
                }
                if (*p == '\\') {                // escape char?
                    p++;
                    if (*p == Char('\"') || *p == Char('\''))
                        ;                        // yes
                    else
                        p--;                        // treat \ literally
                } else {
                    if (!quote && (*p == Char('\"') || *p == Char('\''))) {        // " or ' quote
                        quote = *p++;
                        continue;
                    } else if (QChar((short)(*p)).isSpace() && !quote)
                        break;
                }
                if (*p)
                    *r++ = *p++;
            }
            if (*p && p < p_end)
                p++;
            *r = Char('\0');

            if (argc >= (int)argv.size()-1)        // expand array
                argv.resize(argv.size()*2);
            argv[argc++] = start;
        }
    }
    argv[argc] = 0;

    return argv;
}

static inline QStringList qWinCmdArgs(QString cmdLine) // not const-ref: this might be modified
{
    QStringList args;

    int argc = 0;
    QVector<ushort*> argv = qWinCmdLine<ushort>((ushort*)cmdLine.utf16(), cmdLine.length(), argc);
    for (int a = 0; a < argc; ++a) {
        args << QString::fromUtf16(argv[a]);
    }

    return args;
}

static inline QStringList qCmdLineArgs(int argc, char *argv[])
{
    Q_UNUSED(argc)
    Q_UNUSED(argv)
    QString cmdLine = QT_WA_INLINE(
        QString::fromUtf16((unsigned short*)GetCommandLineW()),
        QString::fromLocal8Bit(GetCommandLineA())
    );
    return qWinCmdArgs(cmdLine);
}

#else  // !Q_OS_WIN

static inline QStringList qCmdLineArgs(int argc, char *argv[])
{
    QStringList args;
	for (int i = 0; i != argc; ++i)
        args += QString::fromLocal8Bit(argv[i]);
    return args;
}

#endif // Q_OS_WIN

QT_END_NAMESPACE

#endif // QCORECMDLINEARGS_WIN_P_H