Source/cmXMLParser.cxx

   1 /*=========================================================================
   2
   3   Program:   CMake - Cross-Platform Makefile Generator
   4   Module:    $RCSfile: cmXMLParser.cxx,v $
   5   Language:  C++
   6   Date:      $Date: 2009-06-11 13:03:56 $
   7   Version:   $Revision: 1.11 $
   8
   9   Copyright (c) 2002 Kitware, Inc., Insight Consortium.  All rights reserved.
  10   See Copyright.txt or http://www.cmake.org/HTML/Copyright.html for details.
  11
  12      This software is distributed WITHOUT ANY WARRANTY; without even
  13      the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
  14      PURPOSE.  See the above copyright notices for more information.
  15
  16 =========================================================================*/
  17 #include "cmXMLParser.h"
  18
  19 #include <cm_expat.h>
  20 #include <ctype.h>
  21
  22 //----------------------------------------------------------------------------
  23 cmXMLParser::cmXMLParser()
  24 {
  25   this->Parser = 0;
  26   this->ParseError = 0;
  27 }
  28
  29 //----------------------------------------------------------------------------
  30 cmXMLParser::~cmXMLParser()
  31 {
  32   if ( this->Parser )
  33     {
  34     this->CleanupParser();
  35     }
  36 }
  37
  38 //----------------------------------------------------------------------------
  39 int cmXMLParser::Parse(const char* string)
  40 {
  41   return (int)this->InitializeParser() &&
  42     this->ParseChunk(string, strlen(string)) &&
  43     this->CleanupParser();
  44 }
  45
  46 int cmXMLParser::ParseFile(const char* file)
  47 {
  48   if ( !file )
  49     {
  50     return 0;
  51     }
  52
  53   std::ifstream ifs(file);
  54   if ( !ifs )
  55     {
  56     return 0;
  57     }
  58
  59   cmOStringStream str;
  60   str << ifs.rdbuf();
  61   return this->Parse(str.str().c_str());
  62 }
  63
  64 //----------------------------------------------------------------------------
  65 int cmXMLParser::InitializeParser()
  66 {
  67   if ( this->Parser )
  68     {
  69     std::cerr << "Parser already initialized" << std::endl;
  70     this->ParseError = 1;
  71     return 0;
  72     }
  73
  74   // Create the expat XML parser.
  75   this->Parser = XML_ParserCreate(0);
  76   XML_SetElementHandler(static_cast<XML_Parser>(this->Parser),
  77                         &cmXMLParserStartElement,
  78                         &cmXMLParserEndElement);
  79   XML_SetCharacterDataHandler(static_cast<XML_Parser>(this->Parser),
  80                               &cmXMLParserCharacterDataHandler);
  81   XML_SetUserData(static_cast<XML_Parser>(this->Parser), this);
  82   this->ParseError = 0;
  83   return 1;
  84 }
  85
  86 //----------------------------------------------------------------------------
  87 int cmXMLParser::ParseChunk(const char* inputString,
  88                             std::string::size_type length)
  89 {
  90   if ( !this->Parser )
  91     {
  92     std::cerr << "Parser not initialized" << std::endl;
  93     this->ParseError = 1;
  94     return 0;
  95     }
  96   int res;
  97   res = this->ParseBuffer(inputString, length);
  98   if ( res == 0 )
  99     {
 100     this->ParseError = 1;
 101     }
 102   return res;
 103 }
 104
 105 //----------------------------------------------------------------------------
 106 int cmXMLParser::CleanupParser()
 107 {
 108   if ( !this->Parser )
 109     {
 110     std::cerr << "Parser not initialized" << std::endl;
 111     this->ParseError = 1;
 112     return 0;
 113     }
 114   int result = !this->ParseError;
 115   if(result)
 116     {
 117     // Tell the expat XML parser about the end-of-input.
 118     if(!XML_Parse(static_cast<XML_Parser>(this->Parser), "", 0, 1))
 119       {
 120       this->ReportXmlParseError();
 121       result = 0;
 122       }
 123     }
 124
 125   // Clean up the parser.
 126   XML_ParserFree(static_cast<XML_Parser>(this->Parser));
 127   this->Parser = 0;
 128
 129   return result;
 130 }
 131
 132 //----------------------------------------------------------------------------
 133 int cmXMLParser::ParseBuffer(const char* buffer, std::string::size_type count)
 134 {
 135   // Pass the buffer to the expat XML parser.
 136   if(!XML_Parse(static_cast<XML_Parser>(this->Parser), buffer,
 137                 static_cast<int>(count), 0))
 138     {
 139     this->ReportXmlParseError();
 140     return 0;
 141     }
 142   return 1;
 143 }
 144
 145 //----------------------------------------------------------------------------
 146 int cmXMLParser::ParseBuffer(const char* buffer)
 147 {
 148   return this->ParseBuffer(buffer, static_cast<int>(strlen(buffer)));
 149 }
 150
 151 //----------------------------------------------------------------------------
 152 int cmXMLParser::ParsingComplete()
 153 {
 154   // Default behavior is to parse to end of stream.
 155   return 0;
 156 }
 157
 158 //----------------------------------------------------------------------------
 159 void cmXMLParser::StartElement(const char * name,
 160   const char ** /*atts*/)
 161 {
 162   std::cout << "Start element: " << name << std::endl;
 163 }
 164
 165 //----------------------------------------------------------------------------
 166 void cmXMLParser::EndElement(const char * name)
 167 {
 168   std::cout << "End element: " << name << std::endl;
 169 }
 170
 171 //----------------------------------------------------------------------------
 172 void cmXMLParser::CharacterDataHandler(const char* /*inData*/,
 173   int /*inLength*/)
 174 {
 175 }
 176
 177 //----------------------------------------------------------------------------
 178 int cmXMLParser::IsSpace(char c)
 179 {
 180   return isspace(c);
 181 }
 182
 183 //----------------------------------------------------------------------------
 184 const char* cmXMLParser::FindAttribute(const char** atts,
 185                                        const char* attribute)
 186 {
 187   if(atts && attribute)
 188     {
 189     for(const char** a = atts; *a && *(a+1); a += 2)
 190       {
 191       if(strcmp(*a, attribute) == 0)
 192         {
 193         return *(a+1);
 194         }
 195       }
 196     }
 197   return 0;
 198 }
 199
 200 //----------------------------------------------------------------------------
 201 void cmXMLParserStartElement(void* parser, const char *name,
 202                               const char **atts)
 203 {
 204   // Begin element handler that is registered with the XML_Parser.
 205   // This just casts the user data to a cmXMLParser and calls
 206   // StartElement.
 207   static_cast<cmXMLParser*>(parser)->StartElement(name, atts);
 208 }
 209
 210 //----------------------------------------------------------------------------
 211 void cmXMLParserEndElement(void* parser, const char *name)
 212 {
 213   // End element handler that is registered with the XML_Parser.  This
 214   // just casts the user data to a cmXMLParser and calls EndElement.
 215   static_cast<cmXMLParser*>(parser)->EndElement(name);
 216 }
 217
 218 //----------------------------------------------------------------------------
 219 void cmXMLParserCharacterDataHandler(void* parser, const char* data,
 220                                       int length)
 221 {
 222   // Character data handler that is registered with the XML_Parser.
 223   // This just casts the user data to a cmXMLParser and calls
 224   // CharacterDataHandler.
 225   static_cast<cmXMLParser*>(parser)->CharacterDataHandler(data, length);
 226 }
 227
 228 //----------------------------------------------------------------------------
 229 void cmXMLParser::ReportXmlParseError()
 230 {
 231   XML_Parser parser = static_cast<XML_Parser>(this->Parser);
 232   this->ReportError(XML_GetCurrentLineNumber(parser),
 233                     XML_GetCurrentColumnNumber(parser),
 234                     XML_ErrorString(XML_GetErrorCode(parser)));
 235 }
 236
 237 //----------------------------------------------------------------------------
 238 void cmXMLParser::ReportError(int line, int, const char* msg)
 239 {
 240   std::cerr << "Error parsing XML in stream at line "
 241             << line << ": " << msg << std::endl;
 242 }