path: root/src/declarative/qml/qmlcustomparser.cpp

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#include "qmlcustomparser_p.h"
#include "qmlcustomparser_p_p.h"
#include "qmlparser_p.h"

#include <QtCore/qdebug.h>

QT_BEGIN_NAMESPACE

using namespace QmlParser;

/*!
    \class QmlCustomParser
    \brief The QmlCustomParser class allows you to add new arbitrary types to QML.
    \internal

    By subclassing QmlCustomParser, you can add an XML parser for
    building a particular type.

    The subclass must implement compile() and create(), and define
    itself in the meta type system with one of the macros:

    \code
    QML_DEFINE_CUSTOM_PARSER(Name, parserClass)
    \endcode

    \code
    QML_DEFINE_CUSTOM_PARSER_NS("XmlNamespaceUri", Name, parserClass)
    \endcode
*/

/*
    \fn QByteArray QmlCustomParser::compile(QXmlStreamReader& reader)

    Upon entry to this function, \a reader is positioned on a
    QXmlStreamReader::StartElement with the name specified when the
    class was defined with the QML_DEFINE_CUSTOM_PARSER macro.

    The custom parser must consume tokens from \a reader until the
    EndElement matching the initial start element is reached, or until
    error.

    Errors must be reported via the error() functions.

    The returned QByteArray contains data meaningful only to the
    custom parser; the type engine will pass this same data to
    create() when making an instance of the data.

    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 QVariant QmlCustomParser::create(const QByteArray &data)

    This function returns a QVariant containing the value represented
    by \a data, which is a block of data previously returned by a call
    to compile().

    If the compile is for a type, the variant should be a pointer to
    the correctly-named QObject subclass (i.e. the one defined by
    QML_DEFINE_TYPE for the same-named type as this custom parser is
    defined for).
*/

QmlCustomParserNode 
QmlCustomParserNodePrivate::fromObject(QmlParser::Object *root)
{
    QmlCustomParserNode rootNode;
    rootNode.d->name = root->typeName;
    rootNode.d->location = root->location.start;

    for(QHash<QByteArray, Property *>::Iterator iter = root->properties.begin();
        iter != root->properties.end();
        ++iter) {

        Property *p = *iter;

        rootNode.d->properties << fromProperty(p);
    }

    return rootNode;
}

QmlCustomParserProperty 
QmlCustomParserNodePrivate::fromProperty(QmlParser::Property *p)
{
    QmlCustomParserProperty prop;
    prop.d->name = p->name;
    prop.d->isList = (p->values.count() > 1);
    prop.d->location = p->location.start;

    if (p->value) {
        QmlCustomParserNode node = fromObject(p->value);
        QList<QmlCustomParserProperty> props = node.properties();
        for (int ii = 0; ii < props.count(); ++ii)
            prop.d->values << QVariant::fromValue(props.at(ii));
    } else {
        for(int ii = 0; ii < p->values.count(); ++ii) {
            Value *v = p->values.at(ii);
            v->type = QmlParser::Value::Literal;

            if(v->object) {
                QmlCustomParserNode node = fromObject(v->object);
                prop.d->values << QVariant::fromValue(node);
            } else {
                prop.d->values << QVariant::fromValue(v->value);
            }

        }
    }

    return prop;
}

QmlCustomParserNode::QmlCustomParserNode()
: d(new QmlCustomParserNodePrivate)
{
}

QmlCustomParserNode::QmlCustomParserNode(const QmlCustomParserNode &other)
: d(new QmlCustomParserNodePrivate)
{
    *this = other;
}

QmlCustomParserNode &QmlCustomParserNode::operator=(const QmlCustomParserNode &other)
{
    d->name = other.d->name;
    d->properties = other.d->properties;
    d->location = other.d->location;
    return *this;
}

QmlCustomParserNode::~QmlCustomParserNode()
{
    delete d; d = 0;
}

QByteArray QmlCustomParserNode::name() const
{
    return d->name;
}

QList<QmlCustomParserProperty> QmlCustomParserNode::properties() const
{
    return d->properties;
}

QmlParser::Location QmlCustomParserNode::location() const
{
    return d->location;
}

QmlCustomParserProperty::QmlCustomParserProperty()
: d(new QmlCustomParserPropertyPrivate)
{
}

QmlCustomParserProperty::QmlCustomParserProperty(const QmlCustomParserProperty &other)
: d(new QmlCustomParserPropertyPrivate)
{
    *this = other;
}

QmlCustomParserProperty &QmlCustomParserProperty::operator=(const QmlCustomParserProperty &other)
{
    d->name = other.d->name;
    d->isList = other.d->isList;
    d->values = other.d->values;
    d->location = other.d->location;
    return *this;
}

QmlCustomParserProperty::~QmlCustomParserProperty()
{
    delete d; d = 0;
}

QByteArray QmlCustomParserProperty::name() const
{
    return d->name;
}

bool QmlCustomParserProperty::isList() const
{
    return d->isList;
}

QmlParser::Location QmlCustomParserProperty::location() const
{
    return d->location;
}

QList<QVariant> QmlCustomParserProperty::assignedValues() const
{
    return d->values;
}

void QmlCustomParser::clearErrors()
{
    exceptions.clear();
}

/*!
    Reports an error in parsing \a prop, with the given \a description.

    An error is generated referring to the position of \a node in the source file.
*/
void QmlCustomParser::error(const QmlCustomParserProperty& prop, const QString& description)
{
    QmlError error;
    QString exceptionDescription;
    error.setLine(prop.location().line);
    error.setColumn(prop.location().column);
    error.setDescription(description);
    exceptions << error;
}

/*!
    Reports an error in parsing \a node, with the given \a description.

    An error is generated referring to the position of \a node in the source file.
*/
void QmlCustomParser::error(const QmlCustomParserNode& node, const QString& description)
{
    QmlError error;
    QString exceptionDescription;
    error.setLine(node.location().line);
    error.setColumn(node.location().column);
    error.setDescription(description);
    exceptions << error;
}

QT_END_NAMESPACE