add partition and rpartition

git-svn-id: http://pystring.googlecode.com/svn/trunk@11 e90ac086-db91-11dd-a3d5-f9b94b98161c

Author: PeterShinners

pystring.cpp

@@ -303,6 +303,48 @@ namespace pystring
         }
 
     }
+
+    //////////////////////////////////////////////////////////////////////////////////////////////
+    ///
+    ///
+    void partition( const std::string & str, const std::string & sep, std::vector< std::string > & result )
+    {
+        result.resize(3);
+        int index = find( str, sep );
+        if ( index < 0 )
+        {
+            result[0] = str;
+            result[1] = "";
+            result[2] = "";
+        }
+        else
+        {
+            result[0] = str.substr( 0, index );
+            result[1] = sep;
+            result[2] = str.substr( index + sep.size(), str.size() );
+        }
+    }
+
+    //////////////////////////////////////////////////////////////////////////////////////////////
+    ///
+    ///
+    void rpartition( const std::string & str, const std::string & sep, std::vector< std::string > & result )
+    {
+        result.resize(3);
+        int index = rfind( str, sep );
+        if ( index < 0 )
+        {
+            result[0] = "";
+            result[1] = "";
+            result[2] = str;
+        }
+        else
+        {
+            result[0] = str.substr( 0, index );
+            result[1] = sep;
+            result[2] = str.substr( index + sep.size(), str.size() );
+        }
+    }
 
     //////////////////////////////////////////////////////////////////////////////////////////////
     ///

pystring.h

@@ -165,6 +165,14 @@ namespace pystring
     ///
     std::string lstrip( const std::string & str, const std::string & chars = "" );
 
+    //////////////////////////////////////////////////////////////////////////////////////////////
+    /// @brief Split the string around first occurance of sep.
+    /// Three strings will always placed into result. If sep is found, the strings will
+    /// be the text before sep, sep itself, and the remaining text. If sep is
+    /// not found, the original string will be returned with two empty strings.
+    ///
+    void partition( const std::string & str, const std::string & sep, std::vector< std::string > & result );
+    
     //////////////////////////////////////////////////////////////////////////////////////////////
     /// @brief Return a copy of the string with all occurrences of substring old replaced by new. If
     /// the optional argument count is given, only the first count occurrences are replaced.
@@ -190,6 +198,14 @@ namespace pystring
     ///
     std::string rjust( const std::string & str, int width);
 
+    //////////////////////////////////////////////////////////////////////////////////////////////
+    /// @brief Split the string around last occurance of sep.
+    /// Three strings will always placed into result. If sep is found, the strings will
+    /// be the text before sep, sep itself, and the remaining text. If sep is
+    /// not found, the original string will be returned with two empty strings.
+    ///
+    void rpartition( const std::string & str, const std::string & sep, std::vector< std::string > & result );
+
     //////////////////////////////////////////////////////////////////////////////////////////////
     /// @brief Return a copy of the string with trailing characters removed. If chars is "", whitespace
     /// characters are removed. If not "", the characters in the string will be stripped from the