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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.apache.org/licenses/LICENSE-2.0 .
*/
#include "computedexpression.hxx"
#include "evaluationcontext.hxx"
#include <com/sun/star/uno/Sequence.hxx>
#include <com/sun/star/xml/xpath/XPathAPI.hpp>
#include <com/sun/star/xml/xpath/XPathExtension.hpp>
#include <com/sun/star/util/SearchAlgorithms2.hpp>
#include <osl/diagnose.h>
#include <i18nutil/searchopt.hxx>
#include <unotools/textsearch.hxx>
#include <comphelper/processfactory.hxx>
using namespace com::sun::star::uno;
using com::sun::star::xml::xpath::XPathAPI;
using com::sun::star::xml::xpath::XXPathAPI;
using com::sun::star::xml::xpath::XPathExtension;
using com::sun::star::xml::xpath::XXPathExtension;
using com::sun::star::xml::xpath::XPathObjectType_XPATH_UNDEFINED;
namespace xforms
{
ComputedExpression::ComputedExpression()
: mbIsEmpty( true ),
mbIsSimple( true )
{
}
ComputedExpression::~ComputedExpression()
{
}
void ComputedExpression::setExpression( const OUString& rExpression )
{
// set new expression, and clear pre-computed results
msExpression = rExpression;
mbIsEmpty = _checkExpression( " *" );
mbIsSimple = false;
mxResult.clear();
}
bool ComputedExpression::_checkExpression( const char* pExpression ) const
{
assert(pExpression && "no expression?");
// call RegExp engine
i18nutil::SearchOptions2 aSearchOptions;
aSearchOptions.AlgorithmType2 = css::util::SearchAlgorithms2::REGEXP;
aSearchOptions.searchString = OUString( pExpression, strlen(pExpression), RTL_TEXTENCODING_ASCII_US );
utl::TextSearch aTextSearch( aSearchOptions );
sal_Int32 nLength = msExpression.getLength();
sal_Int32 nStart = 0;
sal_Int32 nEnd = nLength;
bool bSearch = aTextSearch.SearchForward( msExpression, &nStart, &nEnd );
// our expression is static only if 1) we found our regexp, and 2)
// the regexp goes from beginning to end.
return ( nLength == 0 || bSearch )
&& ( nStart == 0 && nEnd == nLength );
}
bool ComputedExpression::isSimpleExpression() const
{
// actual work is done by setExpression
return mbIsEmpty || mbIsSimple;
}
bool ComputedExpression::_evaluate(
const xforms::EvaluationContext& rContext,
const OUString& sExpression )
{
OSL_ENSURE( rContext.mxContextNode.is(), "no context node in context" );
// obtain value by evaluating XPath expression
mxResult.clear();
try
{
mxResult = _getXPathAPI(rContext)->eval( rContext.mxContextNode,
sExpression );
}
catch( const Exception& )
{
; // ignore exception -> mxResult will be empty
}
return hasValue();
}
bool ComputedExpression::evaluate( const EvaluationContext& rContext )
{
// for simple expression we don't need to re-evaluate (if we have
// an older result); neither for empty expressions
if( mbIsEmpty || (mxResult.is() && mbIsSimple) )
return true;
return _evaluate( rContext, _getExpressionForEvaluation() );
}
bool ComputedExpression::hasValue() const
{
return mxResult.is() &&
mxResult->getObjectType() != XPathObjectType_XPATH_UNDEFINED;
}
void ComputedExpression::clear()
{
mxResult.clear();
}
OUString ComputedExpression::getString() const
{
return mxResult.is() ? mxResult->getString() : OUString();
}
bool ComputedExpression::getBool( bool bDefault ) const
{
return mxResult.is() ? mxResult->getBoolean() : bDefault;
}
Reference<XXPathAPI> ComputedExpression::_getXPathAPI(const xforms::EvaluationContext& aContext)
{
// create XPath API, then register namespaces
Reference<XXPathAPI> xXPath( XPathAPI::create( comphelper::getProcessComponentContext() ) );
// register xforms extension#
Reference< XComponentContext > aComponentContext = comphelper::getProcessComponentContext();
Reference< XXPathExtension > aExtension = XPathExtension::createWithModel(aComponentContext, aContext.mxModel, aContext.mxContextNode);
xXPath->registerExtensionInstance(aExtension);
// register namespaces
if( aContext.mxNamespaces.is() )
{
Sequence<OUString> aPrefixes =aContext.mxNamespaces->getElementNames();
sal_Int32 nCount = aPrefixes.getLength();
const OUString* pPrefixes = aPrefixes.getConstArray();
for( sal_Int32 i = 0; i < nCount; i++ )
{
const OUString* pNamePrefix = &pPrefixes[i];
OUString sNameURL;
aContext.mxNamespaces->getByName( *pNamePrefix ) >>= sNameURL;
xXPath->registerNS( *pNamePrefix, sNameURL );
}
}
// done, so return xXPath-object
return xXPath;
}
} // namespace xforms
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
|
