(C++) XmlToPretty

 

XmlToPretty is an XML code snippet.

 

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#include <algorithm> #include <cassert> #include <iostream> #include <iterator> #include <string> #include <vector> ///Split an XML std::string into its parts //From http://www.richelbilderbeek.nl/CppSplitXml.htm const std::vector<std::string> SplitXml(const std::string& s) {   std::vector<std::string> v;   std::string::const_iterator i = s.begin();   std::string::const_iterator j = s.begin();   const std::string::const_iterator end = s.end();   while (j!=end)   {     ++j;     if ((*j=='>' || *j == '<') && std::distance(i,j) > 1)     {       std::string t;       std::copy(         *i=='<' ? i   : i+1,         *j=='>' ? j+1 : j,         std::back_inserter(t));       v.push_back(t);       i = j;     }   }   return v; } ///Pretty-print an XML std::string by indenting its elements //From http://www.richelbilderbeek.nl/CppXmlToPretty.htm const std::vector<std::string> XmlToPretty(const std::string& s) {   std::vector<std::string> v = SplitXml(s);   int n = -2;   std::for_each(v.begin(),v.end(),     [&n](std::string& s)     {       assert(!s.empty());       if (s[0] == '<' && s[1] != '/')       {         n+=2;       }       s = std::string(n,' ') + s;       if (s[n+0] == '<' && s[n+1] == '/')       {         n-=2;       }     }   );   return v; }

 

 

 

 

 

Testing code

 

XmlToPretty is tested with the code below.

 

• Download the Qt Creator project 'CppXmlToPretty' (zip)

 

 

 

 

 

Technical facts

 

Application type(s)

• Desktop application

Operating system(s) or programming environment(s)

• Lubuntu 12.10 (quantal)

IDE(s):

• Qt Creator 2.5.2

Project type:

• Console application

C++ standard:

• C++11

Compiler(s):

• G++ 4.7.2

Libraries used:

• STL: GNU ISO C++ Library, version 4.7.2

 

 

 

 

 

Qt project file: CppXmlToPretty.pro

 

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TEMPLATE = app QMAKE_CXXFLAGS += -std=c++11 CONFIG += console CONFIG -= qt SOURCES += main.cpp

 

 

 

 

 

main.cpp

 

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#include <algorithm> #include <cassert> #include <iostream> #include <iterator> #include <string> #include <vector> ///Split an XML std::string into its parts //From http://www.richelbilderbeek.nl/CppSplitXml.htm const std::vector<std::string> SplitXml(const std::string& s) {   std::vector<std::string> v;   std::string::const_iterator i = s.begin();   std::string::const_iterator j = s.begin();   const std::string::const_iterator end = s.end();   while (j!=end)   {     ++j;     if ((*j=='>' || *j == '<') && std::distance(i,j) > 1)     {       std::string t;       std::copy(         *i=='<' ? i   : i+1,         *j=='>' ? j+1 : j,         std::back_inserter(t));       v.push_back(t);       i = j;     }   }   return v; } ///Pretty-print an XML std::string by indenting its elements //From http://www.richelbilderbeek.nl/CppXmlToPretty.htm const std::vector<std::string> XmlToPretty(const std::string& s) {   std::vector<std::string> v = SplitXml(s);   int n = -2;   std::for_each(v.begin(),v.end(),     [&n](std::string& s)     {       assert(!s.empty());       if (s[0] == '<' && s[1] != '/')       {         n+=2;       }       s = std::string(n,' ') + s;       if (s[n+0] == '<' && s[n+1] == '/')       {         n-=2;       }     }   );   return v; } int main() {   {     const std::string s = "<a>A</a>";     const std::vector<std::string> split = SplitXml(s);     const std::vector<std::string> split_expected       =       {         "<a>",         "A",         "</a>"       };     assert(split == split_expected);     const std::vector<std::string> pretty = XmlToPretty(s);     const std::vector<std::string> pretty_expected       =       {         "<a>",         "A",         "</a>"       };     assert(pretty == pretty_expected);   }   {     const std::string s = "<a>A<b>B</b></a>";     const std::vector<std::string> split = SplitXml(s);     const std::vector<std::string> split_expected       =       {         "<a>",         "A",         "<b>",         "B",         "</b>",         "</a>"       };     assert(split == split_expected);     const std::vector<std::string> pretty = XmlToPretty(s);     const std::vector<std::string> pretty_expected       =       {         "<a>",         "A",         "  <b>",         "  B",         "  </b>",         "</a>"       };     assert(pretty == pretty_expected);   }   {     const std::string s = "<a>A<b>B1</b><b>B2</b></a>";     const std::vector<std::string> split = SplitXml(s);     const std::vector<std::string> split_expected       =       {         "<a>",         "A",         "<b>",         "B1",         "</b>",         "<b>",         "B2",         "</b>",         "</a>"       };     assert(split == split_expected);     const std::vector<std::string> pretty = XmlToPretty(s);     const std::vector<std::string> pretty_expected       =       {         "<a>",         "A",         "  <b>",         "  B1",         "  </b>",         "  <b>",         "  B2",         "  </b>",         "</a>"       };     assert(pretty == pretty_expected);   } }