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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtQml module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** 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 The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://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 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qqmlcustomparser_p.h"
#include <private/qqmltypecompiler_p.h>
#include <QtCore/qdebug.h>
QT_BEGIN_NAMESPACE
/*!
\class QQmlCustomParser
\brief The QQmlCustomParser class allows you to add new arbitrary types to QML.
\internal
By subclassing QQmlCustomParser, you can add a parser for
building a particular type.
The subclass must implement compile() and setCustomData(), and register
itself in the meta type system by calling the macro:
\code
QML_REGISTER_CUSTOM_TYPE(Module, MajorVersion, MinorVersion, Name, TypeClass, ParserClass)
\endcode
*/
/*
\fn QByteArray QQmlCustomParser::compile(const QList<QQmlCustomParserProperty> & properties)
The custom parser processes \a properties, and returns
a QByteArray containing data meaningful only to the
custom parser; the type engine will pass this same data to
setCustomData() when making an instance of the data.
Errors must be reported via the error() functions.
The QByteArray may be cached between executions of the system, so
it must contain correctly-serialized data (not, for example,
pointers to stack objects).
*/
/*
\fn void QQmlCustomParser::setCustomData(QObject *object, const QByteArray &data)
This function sets \a object to have the properties defined
by \a data, which is a block of data previously returned by a call
to compile().
Errors should be reported using qmlWarning(object).
The \a object will be an instance of the TypeClass specified by QML_REGISTER_CUSTOM_TYPE.
*/
void QQmlCustomParser::clearErrors()
{
exceptions.clear();
}
/*!
Reports an error with the given \a description.
An error is generated referring to the \a location in the source file.
*/
void QQmlCustomParser::error(const QV4::CompiledData::Location &location, const QString &description)
{
exceptions << QQmlCompileError(location, description);
}
struct StaticQtMetaObject : public QObject
{
static const QMetaObject *get()
{ return &staticQtMetaObject; }
};
/*!
If \a script is a simple enumeration expression (eg. Text.AlignLeft),
returns the integer equivalent (eg. 1), and sets \a ok to true.
Otherwise sets \a ok to false.
A valid \a ok must be provided, or the function will assert.
*/
int QQmlCustomParser::evaluateEnum(const QByteArray& script, bool *ok) const
{
Q_ASSERT_X(ok, "QQmlCustomParser::evaluateEnum", "ok must not be a null pointer");
*ok = false;
// we support one or two '.' in the enum phrase:
// * <TypeName>.<EnumValue>
// * <TypeName>.<ScopedEnumName>.<EnumValue>
int dot = script.indexOf('.');
if (dot == -1 || dot == script.length()-1)
return -1;
QString scope = QString::fromUtf8(script.left(dot));
if (scope != QLatin1String("Qt")) {
if (imports.isNull())
return -1;
QQmlType type;
if (imports.isT1()) {
imports.asT1()->resolveType(scope, &type, nullptr, nullptr, nullptr);
} else {
QQmlTypeNameCache::Result result = imports.asT2()->query(scope);
if (result.isValid())
type = result.type;
}
if (!type.isValid())
return -1;
int dot2 = script.indexOf('.', dot+1);
const bool dot2Valid = dot2 != -1 && dot2 != script.length()-1;
QByteArray enumValue = script.mid(dot2Valid ? dot2 + 1 : dot + 1);
QByteArray scopedEnumName = (dot2Valid ? script.mid(dot + 1, dot2 - dot - 1) : QByteArray());
if (!scopedEnumName.isEmpty())
return type.scopedEnumValue(engine, scopedEnumName, enumValue, ok);
else
return type.enumValue(engine, QHashedCStringRef(enumValue.constData(), enumValue.length()), ok);
}
QByteArray enumValue = script.mid(dot + 1);
const QMetaObject *mo = StaticQtMetaObject::get();
int i = mo->enumeratorCount();
while (i--) {
int v = mo->enumerator(i).keyToValue(enumValue.constData(), ok);
if (*ok)
return v;
}
return -1;
}
/*!
Resolves \a name to a type, or 0 if it is not a type. This can be used
to type-check object nodes.
*/
const QMetaObject *QQmlCustomParser::resolveType(const QString& name) const
{
if (!imports.isT1())
return nullptr;
QQmlType qmltype;
if (!imports.asT1()->resolveType(name, &qmltype, nullptr, nullptr, nullptr))
return nullptr;
return qmltype.metaObject();
}
QT_END_NAMESPACE
|
