Adding upstream version 4:7.4.7.upstream/4%7.4.7upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 182 insertions, 0 deletions

diff --git a/forms/source/xforms/computedexpression.cxx b/forms/source/xforms/computedexpression.cxx
new file mode 100644
index 000000000..add8d4350
--- /dev/null
+++ b/forms/source/xforms/computedexpression.cxx
@@ -0,0 +1,182 @@
+/* -*- 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: */