Teuchos - Trilinos Tools Package Version of the Day
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Teuchos_TreeBuildingXMLHandler.cpp
1// @HEADER
2// ***********************************************************************
3//
4// Teuchos: Common Tools Package
5// Copyright (2004) Sandia Corporation
6//
7// Under terms of Contract DE-AC04-94AL85000, there is a non-exclusive
8// license for use of this work by or on behalf of the U.S. Government.
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11// modification, are permitted provided that the following conditions are
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13//
14// 1. Redistributions of source code must retain the above copyright
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17// 2. Redistributions in binary form must reproduce the above copyright
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21// 3. Neither the name of the Corporation nor the names of the
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23// this software without specific prior written permission.
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37// Questions? Contact Michael A. Heroux (maherou@sandia.gov)
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40// @HEADER
41
43#include "Teuchos_StrUtils.hpp"
44#include "Teuchos_Assert.hpp"
45
46using namespace Teuchos;
47
49 : root_(), current_(), path_()
50{
51 current_ = root_;
52}
53
54void TreeBuildingXMLHandler::characters(const std::string& chars)
55{
56 TEUCHOS_TEST_FOR_EXCEPTION(current_.isEmpty(), std::logic_error,
57 "TreeBuildingXMLHandler::trying to add content to an empty node");
58
59 size_t k = current_.numContentLines();
60 // a new line indicates the start of a new ContentLine. Only add it if current line is not empty.
61 if(chars.compare("\n")==0) {
62 if((k>0) && (current_.getContentLine(k-1).length()>0))
63 current_.addContent("");
64 } else {
65 // If no contentLine exists to append create one, else add to the last contentLine
66 // Do not add white characters at the start of a new line
67 if(k==0) {
68 if(!StrUtils::isWhite(chars))
70 } else {
71 if((!StrUtils::isWhite(chars)) || (current_.getContentLine(k-1).length()>0))
72 current_.appendContentLine(k-1,StrUtils::fixUnprintableCharacters(chars));
73 }
74 }
75}
76
77void TreeBuildingXMLHandler::startElement(const std::string& tag,
78 const Map& attributes)
79{
80 XMLObject parent;
81
82 if (current_.isEmpty())
83 {
84 root_ = XMLObject("root");
85 current_ = root_;
86 }
87 parent = current_;
88 path_.push(current_);
89 current_ = XMLObject(tag);
90 parent.addChild(current_);
91
92 for (Map::const_iterator i=attributes.begin(); i != attributes.end(); ++i)
93 {
94 const std::string& key = (*i).first;
95 const std::string& val = (*i).second;
96 current_.addAttribute(key, val);
97 }
98}
99
100int TreeBuildingXMLHandler::endElement(const std::string& tag)
101{
102 int error = 0;
103 if (path_.size() > 0)
104 {
105 if (current_.getTag() != tag) {
106 error = 1; // error: tags must be balanced
107 }
108 // remove empty contentLines at the end.
109 size_t k = current_.numContentLines();
110 while( (k>0) && (current_.getContentLine(--k).length() == 0))
111 current_.removeContentLine(k);
112
113 current_ = path_.top();
114 path_.pop();
115 }
116 else
117 {
118 error = 1; // error: cannot end element that wasn't started
119 }
120 return error;
121}
122
A std::string utilities class for Teuchos.
Defines a class for assembling an XMLObject from XML input.
static std::string fixUnprintableCharacters(const std::string &str)
Convert unprintable non-null characters to whitespace.
static bool isWhite(const std::string &str)
Returns true if a std::string consists entirely of whitespace.
void characters(const std::string &chars)
Process character data.
void startElement(const std::string &tag, const Map &attributes)
Receive notification of the start of an element.
int endElement(const std::string &tag)
Receive notification of the end of an element.
Representation of an XML data tree. XMLObject is a ref-counted handle to a XMLObjectImplem object,...
void addChild(const XMLObject &child)
Add a child node to the node.
const std::string & getTag() const
Return the tag of the current node.
int numContentLines() const
Return the number of lines of character content stored in this node.
void addContent(const std::string &contentLine)
Add a line of character content.
void addAttribute(const std::string &name, T value)
Lookup whether or not Doubles are allowed.
const std::string & getContentLine(int i) const
Return the i-th line of character content stored in this node.
bool isEmpty() const
Find out if a node is empty.
#define TEUCHOS_TEST_FOR_EXCEPTION(throw_exception_test, Exception, msg)
Macro for throwing an exception with breakpointing to ease debugging.
The Teuchos namespace contains all of the classes, structs and enums used by Teuchos,...