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#include "objectlengthcalculator.h"

#include <qmljs/parser/qmljsast_p.h>

using namespace QmlJS;
using namespace QmlDesigner;
using namespace QmlJS::AST;

ObjectLengthCalculator::ObjectLengthCalculator():
        m_doc(Document::create("<internal>", Dialect::Qml))
{
}

bool ObjectLengthCalculator::operator()(const QString &text, quint32 offset,
                                        quint32 &length)
{
    m_offset = offset;
    m_length = 0;
    m_doc->setSource(text);

    if (!m_doc->parseQml())
        return false;

    Node::accept(m_doc->qmlProgram(), this);
    if (m_length) {
        length = m_length;
        return true;
    } else {
        return false;
    }
}

bool ObjectLengthCalculator::visit(QmlJS::AST::UiObjectBinding *ast)
{
    if (m_length > 0)
        return false;

    if (ast->qualifiedTypeNameId && ast->qualifiedTypeNameId->identifierToken.isValid()) {
        const quint32 start = ast->qualifiedTypeNameId->identifierToken.offset;
        const quint32 end = ast->lastSourceLocation().end();

        if (start == m_offset) {
            m_length = end - start;
            return false;
        }

        return m_offset < end;
    } else {
        return true;
    }
}

bool ObjectLengthCalculator::visit(QmlJS::AST::UiObjectDefinition *ast)
{
    if (m_length > 0)
        return false;

    const quint32 start = ast->firstSourceLocation().offset;
    const quint32 end = ast->lastSourceLocation().end();

    if (start == m_offset) {
        m_length = end - start;
        return false;
    }

    return m_offset < end;
}
