forms/source/xforms/pathexpression.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20
  21 #include "pathexpression.hxx"
  22 #include "unohelper.hxx"
  23 #include "evaluationcontext.hxx"
  24 #include "NameContainer.hxx"
  25
  26 #include <com/sun/star/xml/dom/XNode.hpp>
  27 #include <com/sun/star/xml/dom/XNodeList.hpp>
  28 #include <com/sun/star/xml/dom/NodeType.hpp>
  29 #include <com/sun/star/xml/dom/events/XEventListener.hpp>
  30 #include <com/sun/star/xml/dom/events/XEventTarget.hpp>
  31 #include <com/sun/star/xml/xpath/XXPathObject.hpp>
  32 #include <com/sun/star/container/XNameContainer.hpp>
  33 #include <com/sun/star/uno/Sequence.hxx>
  34 #include <rtl/ustrbuf.hxx>
  35
  36 #include <unotools/textsearch.hxx>
  37
  38 #include <algorithm>
  39 #include <functional>
  40
  41
  42 using com::sun::star::uno::Reference;
  43 using com::sun::star::uno::Sequence;
  44 using com::sun::star::xml::dom::XNode;
  45 using com::sun::star::xml::dom::XNodeList;
  46 using com::sun::star::xml::dom::events::XEventListener;
  47 using com::sun::star::xml::dom::events::XEventTarget;
  48 using com::sun::star::container::XNameContainer;
  49 using com::sun::star::xml::xpath::XXPathObject;
  50 using com::sun::star::uno::RuntimeException;
  51 using com::sun::star::uno::UNO_QUERY;
  52 using com::sun::star::uno::UNO_QUERY_THROW;
  53 using com::sun::star::xml::dom::NodeType_TEXT_NODE;
  54 using com::sun::star::xml::xpath::XPathObjectType_XPATH_UNDEFINED;
  55 using namespace std;
  56
  57
  58
  59
  60 namespace xforms
  61 {
  62
  63 PathExpression::PathExpression()
  64     : ComputedExpression(),
  65       maNodes()
  66 {
  67 }
  68
  69 PathExpression::~PathExpression()
  70 {
  71 }
  72
  73
  74
  75 void PathExpression::setExpression( const OUString& rExpression )
  76 {
  77     // set new expression, and clear pre-computed results
  78     ComputedExpression::setExpression( rExpression );
  79
  80     // check expression against regular expression to determine
  81     // whether it contains only 'simple' (i.e. static) conditions. For
  82     // now, we check whether it only contains number positions.
  83     // (TODO: Only works for names containing only ASCII letters+digits.)
  84     mbIsSimple =
  85         _checkExpression( "( */@?[a-zA-Z0-9:]+( *\\[ *[0-9 ]+ *\\] *)?)+" );
  86
  87     maNodes.clear();
  88 }
  89
  90 const OUString PathExpression::_getExpressionForEvaluation() const
  91 {
  92     OUString sExpr = ComputedExpression::_getExpressionForEvaluation();
  93     if( sExpr.isEmpty())
  94         sExpr = ".";
  95     return sExpr;
  96 }
  97
  98 bool PathExpression::evaluate( const EvaluationContext& rContext )
  99 {
 100     // for simple expression we don't need to re-bind (if we were bound before)
 101     // (we will evaluate empty expressions, since they are interpreted as ".")
 102     if( mxResult.is() && isSimpleExpression() )
 103         return true;
 104
 105     bool bResult = _evaluate( rContext, _getExpressionForEvaluation() );
 106
 107     // clear old result, and copy new
 108     maNodes.clear();
 109     if( mxResult.is() )
 110     {
 111         // copy node list
 112         Reference<XNodeList> xNodeList = mxResult->getNodeList();
 113         OSL_ENSURE( xNodeList.is(), "empty object (instead of empty list)" );
 114         sal_Int32 nLength = xNodeList.is() ? xNodeList->getLength() : 0;
 115         for( sal_Int32 n = 0; n < nLength; n++ )
 116             maNodes.push_back( xNodeList->item( n ) );
 117     }
 118
 119     return bResult;
 120 }
 121
 122
 123 Reference<XNode> PathExpression::getNode() const
 124 {
 125     Reference<XNode> xResult;
 126     if( ! maNodes.empty() )
 127         xResult = *maNodes.begin();
 128     return xResult;
 129 }
 130
 131
 132 Reference<XNodeList> PathExpression::getXNodeList() const
 133 {
 134     return mxResult.is() ? mxResult->getNodeList() : Reference<XNodeList>();
 135 }
 136
 137
 138 } // namespace xforms
 139
 140 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */