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FunctionNormalize.hpp

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00001 /*
00002  * The Apache Software License, Version 1.1
00003  *
00004  *
00005  * Copyright (c) 1999 The Apache Software Foundation.  All rights 
00006  * reserved.
00007  *
00008  * Redistribution and use in source and binary forms, with or without
00009  * modification, are permitted provided that the following conditions
00010  * are met:
00011  *
00012  * 1. Redistributions of source code must retain the above copyright
00013  *    notice, this list of conditions and the following disclaimer. 
00014  *
00015  * 2. Redistributions in binary form must reproduce the above copyright
00016  *    notice, this list of conditions and the following disclaimer in
00017  *    the documentation and/or other materials provided with the
00018  *    distribution.
00019  *
00020  * 3. The end-user documentation included with the redistribution,
00021  *    if any, must include the following acknowledgment:  
00022  *       "This product includes software developed by the
00023  *        Apache Software Foundation (http://www.apache.org/)."
00024  *    Alternately, this acknowledgment may appear in the software itself,
00025  *    if and wherever such third-party acknowledgments normally appear.
00026  *
00027  * 4. The names "Xalan" and "Apache Software Foundation" must
00028  *    not be used to endorse or promote products derived from this
00029  *    software without prior written permission. For written 
00030  *    permission, please contact apache@apache.org.
00031  *
00032  * 5. Products derived from this software may not be called "Apache",
00033  *    nor may "Apache" appear in their name, without prior written
00034  *    permission of the Apache Software Foundation.
00035  *
00036  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
00037  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
00038  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
00039  * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
00040  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
00041  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
00042  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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00046  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
00047  * SUCH DAMAGE.
00048  * ====================================================================
00049  *
00050  * This software consists of voluntary contributions made by many
00051  * individuals on behalf of the Apache Software Foundation and was
00052  * originally based on software copyright (c) 1999, International
00053  * Business Machines, Inc., http://www.ibm.com.  For more
00054  * information on the Apache Software Foundation, please see
00055  * <http://www.apache.org/>.
00056  */
00057 #if !defined(FUNCTIONNORMALIZE_HEADER_GUARD_1357924680)
00058 #define FUNCTIONNORMALIZE_HEADER_GUARD_1357924680
00059 
00060 // Base header file.  Must be first.
00061 #include <XPath/XPathDefinitions.hpp>
00062 
00063 
00064 
00065 #include <PlatformSupport/DOMStringHelper.hpp>
00066 #include <PlatformSupport/XalanUnicode.hpp>
00067 
00068 
00069 
00070 // Base class header file...
00071 #include <XPath/FunctionDefaultStringArgument.hpp>
00072 
00073 
00074 
00075 #include <XPath/NodeRefListBase.hpp>
00076 #include <XPath/XObject.hpp>
00077 #include <XPath/XObjectFactory.hpp>
00078 #include <XPath/XPathExecutionContext.hpp>
00079 
00080 
00081 
00085 //
00086 // These are all inline, even though
00087 // there are virtual functions, because we expect that they will only be
00088 // needed by the XPath class.
00089 class XALAN_XPATH_EXPORT FunctionNormalizeSpace : public FunctionDefaultStringArgument
00090 {
00091 public:
00092 
00093     // These methods are inherited from FunctionDefaultStringArgument ...
00094 
00095     virtual XObject*
00096     execute(
00097             XPathExecutionContext&          executionContext,
00098             XalanNode*                      context,
00099             int                             /* opPos */,
00100             const XObjectArgVectorType&     args)
00101     {
00102         XalanDOMString  theSourceString;
00103 
00104         if(args.size() > 2)
00105         {
00106             executionContext.error("The normalize-space() function takes zero arguments or one argument!",
00107                                    context);
00108         }
00109         else if (args.size() == 1)
00110         {
00111             theSourceString = args[0]->str();
00112         }
00113         else if (context == 0)
00114         {
00115             executionContext.error("The normalize-space() function requires a non-null context node!",
00116                                    context);
00117         }
00118         else
00119         {
00120             theSourceString = getDefaultStringArgument(executionContext,
00121                                                        *context);
00122         }
00123 
00124         const unsigned int      theSourceStringLength = length(theSourceString);
00125 
00126         XalanDOMChar            thePreviousChar = 0;
00127 
00128         // A vector to contain the new characters.  We'll use it to construct
00129         // the result string.
00130 #if !defined(XALAN_NO_NAMESPACES)
00131         using std::vector;
00132 #endif
00133 
00134         vector<XalanDOMChar>    theVector;
00135 
00136         // The result string can only be as large as the source string, so
00137         // just reserve the space now.  Also reserve a space for the
00138         // terminating 0.
00139         theVector.reserve(theSourceStringLength + 1);
00140 
00141         // OK, strip out any multiple spaces...
00142         for (unsigned int i = 0; i < theSourceStringLength; i++)
00143         {
00144             const XalanDOMChar  theCurrentChar = charAt(theSourceString, i);
00145 
00146             if (isSpace(theCurrentChar) == true)
00147             {
00148                 // If the previous character wasn't a space, and we've
00149                 // encountered some non-space characters, then push the
00150                 // space.
00151                 if (isSpace(thePreviousChar) == false && theVector.size() > 0)
00152                 {
00153                     theVector.push_back(XalanDOMChar(XalanUnicode::charSpace));
00154                 }
00155             }
00156             else
00157             {
00158                 theVector.push_back(theCurrentChar);
00159             }
00160 
00161             thePreviousChar = theCurrentChar;
00162         }
00163 
00164         if (theVector.empty() == false && isSpace(theVector.back()) == true)
00165         {
00166             // The last character is a space, so remove it
00167             theVector.pop_back();
00168         }
00169 
00170         return executionContext.getXObjectFactory().createString(XalanDOMString(theVector.begin(), theVector.size()));
00171     }
00172 
00173 #if defined(XALAN_NO_COVARIANT_RETURN_TYPE)
00174     virtual Function*
00175 #else
00176     virtual FunctionNormalizeSpace*
00177 #endif
00178     clone() const
00179     {
00180         return new FunctionNormalizeSpace(*this);
00181     }
00182 
00183 private:
00184 
00185     // Not implemented...
00186     FunctionNormalizeSpace&
00187     operator=(const FunctionNormalizeSpace&);
00188 
00189     bool
00190     operator==(const FunctionNormalizeSpace&) const;
00191 };
00192 
00193 
00194 
00195 #endif  // FUNCTIONNORMALIZE_HEADER_GUARD_1357924680

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