/****************************************************************************

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** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).

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** This file is part of the utils of the Qt Toolkit.

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** contained in the Technology Preview License Agreement accompanying

** this package.

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** General Public License version 2.1 as published by the Free Software

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****************************************************************************/

#include <qcoreapplication.h>

#include <qdiriterator.h>

#include <qfile.h>

#include <qmetaobject.h>

#include <qstring.h>

#include <qtextstream.h>

#include <qdebug.h>

#include <limits.h>

#include <stdio.h>

static bool printFilename = true;

static bool modify = false;

QString signature(const QString &line, int pos)

{

    int start = pos;

    // find first open parentheses

    while (start < line.length() && line.at(start) != QLatin1Char('('))

        ++start;

    int i = ++start;

    int par = 1;

    // find matching closing parentheses

    while (i < line.length() && par > 0) {

        if (line.at(i) == QLatin1Char('('))

            ++par;

        else if (line.at(i) == QLatin1Char(')'))

            --par;

        ++i;

    }

    if (par == 0)

        return line.mid(start, i - start - 1);

    return QString();

}

bool checkSignature(const QString &fileName, QString &line, const char *sig)

{

    static QStringList fileList;

    int idx = -1;

    bool found = false;

    while ((idx = line.indexOf(sig, ++idx)) != -1) {

        const QByteArray sl(signature(line, idx).toLocal8Bit());

        QByteArray nsl(QMetaObject::normalizedSignature(sl.constData()));

        if (sl != nsl) {

            found = true;

            if (printFilename && !fileList.contains(fileName)) {

                fileList.prepend(fileName);

                printf("%s\n", fileName.toLocal8Bit().constData());

            }

            if (modify)

                line.replace(sl, nsl);

            //qDebug("expected '%s', got '%s'", nsl.data(), sl.data());

        }

    }

    return found;

}

void writeChanges(const QString &fileName, const QStringList &lines)

{

    QFile file(fileName);

    if (!file.open(QIODevice::WriteOnly)) {

        qDebug("unable to open file '%s' for writing (%s)", fileName.toLocal8Bit().constData(), file.errorString().toLocal8Bit().constData());

        return;

    }

    QTextStream stream(&file);

    for (int i = 0; i < lines.count(); ++i)

        stream << lines.at(i);

    file.close();

}

void check(const QString &fileName)

{

    QFile file(fileName);

    if (!file.open(QIODevice::ReadOnly)) {

        qDebug("unable to open file: '%s' (%s)", fileName.toLocal8Bit().constData(), file.errorString().toLocal8Bit().constData());

        return;

    }

    QStringList lines;

    bool found = false;

    while (true) {

        QByteArray bline = file.readLine(16384);

        if (bline.isEmpty())

            break;

        QString line = QString::fromLocal8Bit(bline);

        Q_ASSERT_X(line.endsWith("\n"), "check()", fileName.toLocal8Bit().constData());

        found |= checkSignature(fileName, line, "SLOT");

        found |= checkSignature(fileName, line, "SIGNAL");

        if (modify)

            lines << line;

    }

    file.close();

    if (found && modify) {

        printf("Modifying file: '%s'\n", fileName.toLocal8Bit().constData());

        writeChanges(fileName, lines);

    }

}

void traverse(const QString &path)

{

    QDirIterator dirIterator(path, QDir::NoDotAndDotDot | QDir::Dirs | QDir::Files | QDir::NoSymLinks);

    while (dirIterator.hasNext()) {

        QString filePath = dirIterator.next();

        if (filePath.endsWith(".cpp"))

            check(filePath);

        else if (QFileInfo(filePath).isDir())

            traverse(filePath); // recurse

    }

}

int main(int argc, char *argv[])

{

    QCoreApplication app(argc, argv);

    if (app.argc() < 2 || (app.argc() == 2 && (app.argv()[1][0] == '-'))) {

        printf("usage: normalize [--modify] <path>\n");

        printf("  <path> can be a single file or a directory (default: look for *.cpp recursively)");

        printf("  Outputs all filenames that contain non-normalized SIGNALs and SLOTs\n");

        printf("  with --modify: fix all occurences of non-normalized SIGNALs and SLOTs\n");

        return 1;

    }

    QString path;

    if (qstrcmp(app.argv()[1], "--modify") == 0) {

        printFilename = false;

        modify = true;

        path = app.argv()[2];

    } else {

        path = app.argv()[1];

    }

    if (path.startsWith("-")) {

        qWarning("unknown parameter: %s", path.toLocal8Bit().constData());

        return 1;

    }

    QFileInfo fi(path);

    if (fi.isFile()) {

        check(path);

    } else if (fi.isDir()) {

        if (!path.endsWith("/"))

            path.append("/");

        traverse(path);

    } else {

        qWarning("Don't know what to do with '%s'", path.toLocal8Bit().constData());

        return 1;

    }

    return 0;

}