Technical facts

Application type(s)

Desktop application

Operating system(s) or programming environment(s)

Lubuntu 12.04 (precise)

IDE(s):

Qt Creator 2.4.1

Project type:

Console application

C++ standard:

C++98

Compiler(s):

G++ 4.6.3

Libraries used:

STL: GNU ISO C++ Library, version 4.6.3

Qt project file: CppStripXmlTag.pro


QT       -= core

QT       -= gui

TARGET = CppStripXmlTag

CONFIG   += console

CONFIG   -= app_bundle

TEMPLATE = app

SOURCES += main.cpp

main.cpp


#include <cassert>

#include <string>



///Strip the XML tags of an XML item

///For example '<tag>text</tag>' becomes 'text'

///Note that also '<any_tag>text</other_tag>' fails

///From http://www.richelbilderbeek.nl/CppStripXmlTag.htm

const std::string StripXmlTag(const std::string& s)

{

  if (s.empty()) return "";

  if (s[0]!='<') return "";

  if (s[s.size() - 1]!='>') return "";

  const std::size_t begin = s.find_first_of('>');

  if (begin == std::string::npos) return "";

  const std::size_t end = s.find_last_of('<');

  if (end == std::string::npos) return "";

  if (begin > end) return "";

  assert(begin < end);

  const std::string tag_left = s.substr(0,begin+1);

  assert(!tag_left.empty());

  assert(tag_left[0] == '<');

  assert(tag_left[tag_left.size() - 1] == '>');

  const std::string tag_left_text = tag_left.substr(1,tag_left.size() - 2);

  if (tag_left_text.empty()) return "";

  const std::string tag_right = s.substr(end,s.size() - end);

  if (tag_right.size() < 2) return "";

  assert(!tag_right.empty());

  assert(tag_right[0] == '<');

  assert(tag_right[tag_right.size() - 1] == '>');

  const std::string tag_right_text = tag_right.substr(2,tag_right.size() - 3);

  if (tag_right_text.empty()) return "";

  if (tag_left_text != tag_right_text) return "";

  const std::string text = s.substr(begin + 1,end - begin - 1);

  return text;

}





int main()

{

  assert(StripXmlTag("<my_tag>text</my_tag>") == "text");

  assert(StripXmlTag("<mytag>text</mytag>") == "text");

  assert(StripXmlTag("<tags>text</tags>") == "text");

  assert(StripXmlTag("<tag>text</tag>") == "text");

  assert(StripXmlTag("<tg>text</tg>") == "text");

  assert(StripXmlTag("<t>text</t>") == "text");

  assert(StripXmlTag("<x>y</x>") == "y");

  assert(StripXmlTag("<x>y</x></x>") == "y</x>");

  assert(StripXmlTag("<x><x>y</x>") == "<x>y");

  assert(StripXmlTag("<x><x>y</x></x>") == "<x>y</x>");

  assert(StripXmlTag("<x>y</z>") == "");

  assert(StripXmlTag("<x>y<x>") == "");

  assert(StripXmlTag("<>y<>") == "");

  assert(StripXmlTag("<>y</>") == "");

  assert(StripXmlTag("<x>y") == "");

  assert(StripXmlTag("<x></x>") == "");

}

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(C++) StripXmlTag

Technical facts

Qt project file: CppStripXmlTag.pro

main.cpp