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Teuchos_TreeBuildingXMLHandler.cpp
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00004 //                    Teuchos: Common Tools Package
00005 //                 Copyright (2004) Sandia Corporation
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00011 // modification, are permitted provided that the following conditions are
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00022 // contributors may be used to endorse or promote products derived from
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00041 
00042 #include "Teuchos_TreeBuildingXMLHandler.hpp"
00043 #include "Teuchos_StrUtils.hpp"
00044 #include "Teuchos_Assert.hpp"
00045 
00046 using namespace Teuchos;
00047 
00048 TreeBuildingXMLHandler::TreeBuildingXMLHandler()
00049   : root_(), current_(), path_()
00050 { 
00051   current_ = root_;
00052 }
00053 
00054 void TreeBuildingXMLHandler::characters(const std::string& chars)
00055 {
00056   TEUCHOS_TEST_FOR_EXCEPTION(current_.isEmpty(), std::logic_error,
00057                      "TreeBuildingXMLHandler::trying to add content to an empty node");
00058 
00059   size_t k = current_.numContentLines();
00060   // a new line indicates the start of a new ContentLine. Only add it if current line is not empty.
00061   if(chars.compare("\n")==0) {
00062     if((k>0) && (current_.getContentLine(k-1).length()>0))
00063       current_.addContent("");
00064   } else {
00065     // If no contentLine exists to append create one, else add to the last contentLine
00066     // Do not add white characters at the start of a new line
00067     if(k==0) {
00068       if(!StrUtils::isWhite(chars))
00069         current_.addContent(StrUtils::fixUnprintableCharacters(chars));
00070     } else {
00071       if((!StrUtils::isWhite(chars)) || (current_.getContentLine(k-1).length()>0))
00072         current_.appendContentLine(k-1,StrUtils::fixUnprintableCharacters(chars));
00073     }
00074   }
00075 }
00076 
00077 void TreeBuildingXMLHandler::startElement(const std::string& tag, 
00078                                           const Map& attributes)
00079 {
00080   XMLObject parent;
00081   
00082   if (current_.isEmpty()) 
00083     {
00084       root_ = XMLObject("root");
00085       current_ = root_;
00086     }
00087   parent = current_;
00088   path_.push(current_);
00089   current_ = XMLObject(tag);
00090   parent.addChild(current_);
00091 
00092   for (Map::const_iterator i=attributes.begin(); i != attributes.end(); ++i)
00093     {
00094       const std::string& key = (*i).first;
00095       const std::string& val = (*i).second;
00096       current_.addAttribute(key, val);
00097     }
00098 }
00099 
00100 int TreeBuildingXMLHandler::endElement(const std::string& tag)
00101 {
00102   int error = 0;
00103   if (path_.size() > 0)
00104     {
00105       if (current_.getTag() != tag) {
00106         error = 1; // error: tags must be balanced
00107       }
00108       // remove empty contentLines at the end.
00109       size_t k = current_.numContentLines();
00110       while( (k>0) && (current_.getContentLine(--k).length() == 0))
00111         current_.removeContentLine(k);
00112 
00113       current_ = path_.top();
00114       path_.pop();
00115     }
00116   else 
00117     {
00118       error = 1; // error: cannot end element that wasn't started
00119     }
00120   return error;
00121 }
00122 
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