/****************************************************************************
**
** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtQml 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
** a written agreement between you and Digia. For licensing terms and
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** use the contact form at http://qt.digia.com/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.
**
** In addition, as a special exception, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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** $QT_END_LICENSE$
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****************************************************************************/

#include "qqmldirparser_p.h"
#include "qqmlerror.h"

#include <QtCore/QtDebug>

QT_BEGIN_NAMESPACE

static int parseInt(const QStringRef &str, bool *ok)
{
    int pos = 0;
    int number = 0;
    while (pos < str.length() && str.at(pos).isDigit()) {
        if (pos != 0)
            number *= 10;
        number += str.at(pos).unicode() - '0';
        ++pos;
    }
    if (pos != str.length())
        *ok = false;
    else
        *ok = true;
    return number;
}

QQmlDirParser::QQmlDirParser()
{
}

QQmlDirParser::~QQmlDirParser()
{
}

inline static void scanSpace(const QChar *&ch) {
    while (ch->isSpace() && !ch->isNull() && *ch != QLatin1Char('\n'))
        ++ch;
}

inline static void scanToEnd(const QChar *&ch) {
    while (*ch != QLatin1Char('\n') && !ch->isNull())
        ++ch;
}

inline static void scanWord(const QChar *&ch) {
    while (!ch->isSpace() && !ch->isNull())
        ++ch;
}

/*!
\a url is used for generating errors.
*/
bool QQmlDirParser::parse(const QString &source)
{
    _errors.clear();
    _plugins.clear();
    _components.clear();
    _scripts.clear();

    quint16 lineNumber = 0;
    bool firstLine = true;

    const QChar *ch = source.constData();
    while (!ch->isNull()) {
        ++lineNumber;

        bool invalidLine = false;
        const QChar *lineStart = ch;

        scanSpace(ch);
        if (*ch == QLatin1Char('\n')) {
            ++ch;
            continue;
        }
        if (ch->isNull())
            break;

        QString sections[4];
        int sectionCount = 0;

        do {
            if (*ch == QLatin1Char('#')) {
                scanToEnd(ch);
                break;
            }
            const QChar *start = ch;
            scanWord(ch);
            if (sectionCount < 4) {
                sections[sectionCount++] = source.mid(start-source.constData(), ch-start);
            } else {
                reportError(lineNumber, start-lineStart, QLatin1String("unexpected token"));
                scanToEnd(ch);
                invalidLine = true;
                break;
            }
            scanSpace(ch);
        } while (*ch != QLatin1Char('\n') && !ch->isNull());

        if (!ch->isNull())
            ++ch;

        if (invalidLine) {
            reportError(lineNumber, 0,
                        QString::fromLatin1("invalid qmldir directive contains too many tokens"));
            continue;
        } else if (sectionCount == 0) {
            continue; // no sections, no party.

        } else if (sections[0] == QLatin1String("module")) {
            if (sectionCount != 2) {
                reportError(lineNumber, 0,
                            QString::fromLatin1("module identifier directive requires one argument, but %1 were provided").arg(sectionCount - 1));
                continue;
            }
            if (!_typeNamespace.isEmpty()) {
                reportError(lineNumber, 0,
                            QString::fromLatin1("only one module identifier directive may be defined in a qmldir file"));
                continue;
            }
            if (!firstLine) {
                reportError(lineNumber, 0,
                            QString::fromLatin1("module identifier directive must be the first directive in a qmldir file"));
                continue;
            }

            _typeNamespace = sections[1];

        } else if (sections[0] == QLatin1String("plugin")) {
            if (sectionCount < 2 || sectionCount > 3) {
                reportError(lineNumber, 0,
                            QString::fromLatin1("plugin directive requires one or two 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, 0,
                            QString::fromLatin1("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.insertMulti(entry.typeName, entry);
        } else if (sections[0] == QLatin1String("singleton")) {
            if (sectionCount < 3 || sectionCount > 4) {
                reportError(lineNumber, 0,
                            QString::fromLatin1("singleton types require 2 or 3 arguments, but %1 were provided").arg(sectionCount - 1));
                continue;
            } else if (sectionCount == 3) {
                // handle qmldir directory listing case where singleton is defined in the following pattern:
                // singleton TestSingletonType TestSingletonType.qml
                Component entry(sections[1], sections[2], -1, -1);
                entry.singleton = true;
                _components.insertMulti(entry.typeName, entry);
            } else {
                // handle qmldir module listing case where singleton is defined in the following pattern:
                // singleton TestSingletonType 2.0 TestSingletonType20.qml
                const QString &version = sections[2];
                const int dotIndex = version.indexOf(QLatin1Char('.'));

                if (dotIndex == -1) {
                    reportError(lineNumber, 0, QLatin1String("expected '.'"));
                } else if (version.indexOf(QLatin1Char('.'), dotIndex + 1) != -1) {
                    reportError(lineNumber, 0, QLatin1String("unexpected '.'"));
                } else {
                    bool validVersionNumber = false;
                    const int majorVersion = parseInt(QStringRef(&version, 0, dotIndex), &validVersionNumber);

                    if (validVersionNumber) {
                        const int minorVersion = parseInt(QStringRef(&version, dotIndex+1, version.length()-dotIndex-1), &validVersionNumber);

                        if (validVersionNumber) {
                            const QString &fileName = sections[3];
                            Component entry(sections[1], fileName, majorVersion, minorVersion);
                            entry.singleton = true;
                            _components.insertMulti(entry.typeName, entry);
                        }
                    }
                }
            }
        } else if (sections[0] == QLatin1String("typeinfo")) {
            if (sectionCount != 2) {
                reportError(lineNumber, 0,
                            QString::fromLatin1("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.insertMulti(entry.typeName, entry);
        } else if (sectionCount == 3) {
            const QString &version = sections[1];
            const int dotIndex = version.indexOf(QLatin1Char('.'));

            if (dotIndex == -1) {
                reportError(lineNumber, 0, QLatin1String("expected '.'"));
            } else if (version.indexOf(QLatin1Char('.'), dotIndex + 1) != -1) {
                reportError(lineNumber, 0, QLatin1String("unexpected '.'"));
            } else {
                bool validVersionNumber = false;
                const int majorVersion = parseInt(QStringRef(&version, 0, dotIndex), &validVersionNumber);

                if (validVersionNumber) {
                    const int minorVersion = parseInt(QStringRef(&version, dotIndex+1, version.length()-dotIndex-1), &validVersionNumber);

                    if (validVersionNumber) {
                        const QString &fileName = sections[2];

                        if (fileName.endsWith(QLatin1String(".js"))) {
                            // A 'js' extension indicates a namespaced script import
                            const Script entry(sections[0], fileName, majorVersion, minorVersion);
                            _scripts.append(entry);
                        } else {
                            const Component entry(sections[0], fileName, majorVersion, minorVersion);
                            _components.insertMulti(entry.typeName, entry);
                        }
                    }
                }
            }
        } else {
            reportError(lineNumber, 0,
                        QString::fromLatin1("a component declaration requires two or three arguments, but %1 were provided").arg(sectionCount));
        }

        firstLine = false;
    }

    return hasError();
}

void QQmlDirParser::reportError(quint16 line, quint16 column, const QString &description)
{
    QQmlJS::DiagnosticMessage error;
    error.loc.startLine = line;
    error.loc.startColumn = column;
    error.message = description;
    _errors.append(error);
}

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

    return false;
}

#if defined(QT_BUILD_QMLDEVTOOLS_LIB) || defined(QT_QMLDEVTOOLS_LIB)
QList<QQmlJS::DiagnosticMessage> QQmlDirParser::errors(const QString &uri) const
{
    QList<QQmlJS::DiagnosticMessage> errors = _errors;
    for (int i = 0; i < errors.size(); ++i) {
        QQmlJS::DiagnosticMessage &msg = errors[i];
        msg.message.replace(QLatin1String("$$URI$$"), uri);
    }
    return errors;
}
#else
void QQmlDirParser::setError(const QQmlError &e)
{
    _errors.clear();
    reportError(e.line(), e.column(), e.description());
}

QList<QQmlError> QQmlDirParser::errors(const QString &uri) const
{
    QUrl url(uri);
    QList<QQmlError> errors;
    for (int i = 0; i < _errors.size(); ++i) {
        const QQmlJS::DiagnosticMessage &msg = _errors.at(i);
        QQmlError e;
        QString description = msg.message;
        description.replace(QLatin1String("$$URI$$"), uri);
        e.setDescription(description);
        e.setUrl(url);
        e.setLine(msg.loc.startLine);
        e.setColumn(msg.loc.startColumn);
        errors << e;
    }
    return errors;
}
#endif

QString QQmlDirParser::typeNamespace() const
{
    return _typeNamespace;
}

void QQmlDirParser::setTypeNamespace(const QString &s)
{
    _typeNamespace = s;
}

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

QHash<QString, QQmlDirParser::Component> QQmlDirParser::components() const
{
    return _components;
}

QList<QQmlDirParser::Script> QQmlDirParser::scripts() const
{
    return _scripts;
}

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

QDebug &operator<< (QDebug &debug, const QQmlDirParser::Component &component)
{
    const QString output = QString::fromLatin1("{%1 %2.%3}").
        arg(component.typeName).arg(component.majorVersion).arg(component.minorVersion);
    return debug << qPrintable(output);
}

QDebug &operator<< (QDebug &debug, const QQmlDirParser::Script &script)
{
    const QString output = QString::fromLatin1("{%1 %2.%3}").
        arg(script.nameSpace).arg(script.majorVersion).arg(script.minorVersion);
    return debug << qPrintable(output);
}

QT_END_NAMESPACE