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 00043 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 00044 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 00045 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 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(FUNCTIONSUBSTRING_HEADER_GUARD_1357924680) 00058 #define FUNCTIONSUBSTRING_HEADER_GUARD_1357924680 00059 00060 00061 00062 // Base header file. Must be first. 00063 #include <XPath/XPathDefinitions.hpp> 00064 00065 00066 00067 #include <cfloat> 00068 00069 00070 00071 #include <PlatformSupport/DoubleSupport.hpp> 00072 #include <PlatformSupport/DOMStringHelper.hpp> 00073 00074 00075 00076 // Base class header file... 00077 #include <XPath/Function.hpp> 00078 00079 00080 00081 #include <XPath/FunctionRound.hpp> 00082 #include <XPath/XObject.hpp> 00083 #include <XPath/XObjectFactory.hpp> 00084 #include <XPath/XPathExecutionContext.hpp> 00085 00086 00087 00091 // 00092 // These are all inline, even though 00093 // there are virtual functions, because we expect that they will only be 00094 // needed by the XPath class. 00095 class XALAN_XPATH_EXPORT FunctionSubstring : public Function 00096 { 00097 public: 00098 00099 // These methods are inherited from Function ... 00100 00101 virtual XObject* 00102 execute( 00103 XPathExecutionContext& executionContext, 00104 XalanNode* context, 00105 int /* opPos */, 00106 const XObjectArgVectorType& args) 00107 { 00108 const XObjectArgVectorType::size_type theArgCount = 00109 args.size(); 00110 00111 if (theArgCount < 2 || theArgCount > 3) 00112 { 00113 executionContext.error("The substring() function takes two or three arguments!", 00114 context); 00115 } 00116 00117 const XalanDOMString& theSourceString = args[0]->str(); 00118 const unsigned int theSourceStringLength = length(theSourceString); 00119 00120 #if !defined(XALAN_NO_NAMESPACES) 00121 using std::vector; 00122 #endif 00123 00124 // This buffer will hold the output characters. 00125 vector<XalanDOMChar> theBuffer; 00126 00127 if (theSourceStringLength > 0) 00128 { 00129 // The substring can only be as long as the source string, 00130 // so reserve enough space now. Also reserve space for 00131 // the terminating 0. 00132 theBuffer.reserve(theSourceStringLength); 00133 00134 // $$$ ToDo: Add support for NaN. 00135 00136 // Get the value of the second argument... 00137 const double theSecondArgValue = 00138 FunctionRound::getRoundedValue(args[1]->num()); 00139 00140 // Now, total the second and third arguments. If 00141 // the third argument is missing, make the total 00142 // DBL_MAX. 00143 const double theTotal = 00144 theArgCount == 2 ? DBL_MAX : 00145 FunctionRound::getRoundedValue(theSecondArgValue + args[2]->num()); 00146 00147 if (DoubleSupport::isNaN(theSecondArgValue) == false && 00148 DoubleSupport::isNaN(theTotal) == false && 00149 DoubleSupport::isNegativeInfinity(theTotal) == false) 00150 { 00151 // Start with 1, since strings are index from 1 in the XPath spec, 00152 for (unsigned int i = 1; i <= theSourceStringLength; i++) 00153 { 00154 // Is the index greater than or equal to the second argument? 00155 if (i >= theSecondArgValue) 00156 { 00157 // Is it less than the sum of the second and 00158 // third arguments? 00159 if (i < theTotal) 00160 { 00161 // It is, so include the character. 00162 theBuffer.push_back(charAt(theSourceString, i - 1)); 00163 } 00164 else 00165 { 00166 // It's not, so stop. 00167 break; 00168 } 00169 } 00170 } 00171 } 00172 } 00173 00174 return executionContext.getXObjectFactory().createString(XalanDOMString(theBuffer.begin(), theBuffer.size())); 00175 } 00176 00177 #if defined(XALAN_NO_COVARIANT_RETURN_TYPE) 00178 virtual Function* 00179 #else 00180 virtual FunctionSubstring* 00181 #endif 00182 clone() const 00183 { 00184 return new FunctionSubstring(*this); 00185 } 00186 00187 private: 00188 00189 // Not implemented... 00190 FunctionSubstring& 00191 operator=(const FunctionSubstring&); 00192 00193 bool 00194 operator==(const FunctionSubstring&) const; 00195 }; 00196 00197 00198 00199 #endif // FUNCTIONSUBSTRING_HEADER_GUARD_1357924680
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