/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the QtDeclarative module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL21$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
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** information use the contact form at http://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** As a special exception, The Qt Company gives you certain additional
** rights. These rights are described in The Qt Company LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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** $QT_END_LICENSE$
**
****************************************************************************/

#include "private/qdeclarativedirparser_p.h"
#include "qdeclarativeerror.h"
#include <private/qdeclarativeglobal_p.h>

#include <QtCore/QTextStream>
#include <QtCore/QFile>
#include <QtCore/QtDebug>

QT_BEGIN_NAMESPACE

QDeclarativeDirParser::QDeclarativeDirParser()
    : _isParsed(false)
{
}

QDeclarativeDirParser::~QDeclarativeDirParser()
{
}

QUrl QDeclarativeDirParser::url() const
{
    return _url;
}

void QDeclarativeDirParser::setUrl(const QUrl &url)
{
    _url = url;
}

QString QDeclarativeDirParser::fileSource() const
{
    return _filePathSouce;
}

void QDeclarativeDirParser::setFileSource(const QString &filePath)
{
    _filePathSouce = filePath;
}

QString QDeclarativeDirParser::source() const
{
    return _source;
}

void QDeclarativeDirParser::setSource(const QString &source)
{
    _isParsed = false;
    _source = source;
}

bool QDeclarativeDirParser::isParsed() const
{
    return _isParsed;
}

bool QDeclarativeDirParser::parse()
{
    if (_isParsed)
        return true;

    _isParsed = true;
    _errors.clear();
    _plugins.clear();
    _components.clear();

    if (_source.isEmpty() && !_filePathSouce.isEmpty()) {
        QFile file(_filePathSouce);
        if (!QDeclarative_isFileCaseCorrect(_filePathSouce)) {
            QDeclarativeError error;
            error.setDescription(QString::fromUtf8("cannot load module \"$$URI$$\": File name case mismatch for \"%1\"").arg(_filePathSouce));
            _errors.prepend(error);
            return false;
        } else if (file.open(QFile::ReadOnly)) {
            _source = QString::fromUtf8(file.readAll());
        } else {
            QDeclarativeError error;
            error.setDescription(QString::fromUtf8("module \"$$URI$$\" definition \"%1\" not readable").arg(_filePathSouce));
            _errors.prepend(error);
            return false;
        }
    }

    QTextStream stream(&_source);
    int lineNumber = 0;

    forever {
        ++lineNumber;

        const QString line = stream.readLine();
        if (line.isNull())
            break;

        QString sections[3];
        int sectionCount = 0;

        int index = 0;
        const int length = line.length();

        while (index != length) {
            const QChar ch = line.at(index);

            if (ch.isSpace()) {
                do { ++index; }
                while (index != length && line.at(index).isSpace());

            } else if (ch == QLatin1Char('#')) {
                // recognized a comment
                break;

            } else {
                const int start = index;

                do { ++index; }
                while (index != length && !line.at(index).isSpace());

                const QString lexeme = line.mid(start, index - start);

                if (sectionCount >= 3) {
                    reportError(lineNumber, start, QLatin1String("unexpected token"));

                } else {
                    sections[sectionCount++] = lexeme;
                }
            }
        }

        if (sectionCount == 0) {
            continue; // no sections, no party.

        } else if (sections[0] == QLatin1String("plugin")) {
            if (sectionCount < 2) {
                reportError(lineNumber, -1,
                            QString::fromUtf8("plugin directive requires 2 arguments, but %1 were provided").arg(sectionCount + 1));

                continue;
            }

            const Plugin entry(sections[1], sections[2]);

            _plugins.append(entry);

        } else if (sections[0] == QLatin1String("internal")) {
            if (sectionCount != 3) {
                reportError(lineNumber, -1,
                            QString::fromUtf8("internal types require 2 arguments, but %1 were provided").arg(sectionCount + 1));
                continue;
            }
            Component entry(sections[1], sections[2], -1, -1);
            entry.internal = true;
            _components.append(entry);
        } else if (sections[0] == QLatin1String("typeinfo")) {
            if (sectionCount != 2) {
                reportError(lineNumber, -1,
                            QString::fromUtf8("typeinfo requires 1 argument, but %1 were provided").arg(sectionCount - 1));
                continue;
            }
#ifdef QT_CREATOR
            TypeInfo typeInfo(sections[1]);
            _typeInfos.append(typeInfo);
#endif

        } else if (sectionCount == 2) {
            // No version specified (should only be used for relative qmldir files)
            const Component entry(sections[0], sections[1], -1, -1);
            _components.append(entry);
        } else if (sectionCount == 3) {
            const QString &version = sections[1];
            const int dotIndex = version.indexOf(QLatin1Char('.'));

            if (dotIndex == -1) {
                reportError(lineNumber, -1, QLatin1String("expected '.'"));
            } else if (version.indexOf(QLatin1Char('.'), dotIndex + 1) != -1) {
                reportError(lineNumber, -1, QLatin1String("unexpected '.'"));
            } else {
                bool validVersionNumber = false;
                const int majorVersion = version.left(dotIndex).toInt(&validVersionNumber);

                if (validVersionNumber) {
                    const int minorVersion = version.mid(dotIndex + 1).toInt(&validVersionNumber);

                    if (validVersionNumber) {
                        const Component entry(sections[0], sections[2], majorVersion, minorVersion);

                        _components.append(entry);
                    }
                }
            }
        } else {
            reportError(lineNumber, -1,
                        QString::fromUtf8("a component declaration requires 3 arguments, but %1 were provided").arg(sectionCount + 1));
        }
    }

    return hasError();
}

void QDeclarativeDirParser::reportError(int line, int column, const QString &description)
{
    QDeclarativeError error;
    error.setUrl(_url);
    error.setLine(line);
    error.setColumn(column);
    error.setDescription(description);
    _errors.append(error);
}

bool QDeclarativeDirParser::hasError() const
{
    if (! _errors.isEmpty())
        return true;

    return false;
}

QList<QDeclarativeError> QDeclarativeDirParser::errors(const QString &uri) const
{
    QList<QDeclarativeError> errors = _errors;
    for (int i = 0; i < errors.size(); ++i) {
        QDeclarativeError &e = errors[i];
        QString description = e.description();
        description.replace(QLatin1String("$$URI$$"), uri);
        e.setDescription(description);
    }
    return errors;
}

QList<QDeclarativeDirParser::Plugin> QDeclarativeDirParser::plugins() const
{
    return _plugins;
}

QList<QDeclarativeDirParser::Component> QDeclarativeDirParser::components() const
{
    return _components;
}

#ifdef QT_CREATOR
QList<QDeclarativeDirParser::TypeInfo> QDeclarativeDirParser::typeInfos() const
{
    return _typeInfos;
}
#endif

QT_END_NAMESPACE
