diff --git a/src/funinfo.h b/src/funinfo.h
index 65f3c57..3ffd4a0 100755
--- a/src/funinfo.h
+++ b/src/funinfo.h
@@ -54,6 +54,11 @@ struct FunInfo
 	// output stream
 	StreamType & out;
 
+	// the out stream is treated in case sensitive
+	// used only in [is...] statements
+	// default: true
+	bool case_sensitive;
+
 	// table of parameters
 	// the table can be empty
 	std::vector<std::wstring> & params;
@@ -89,6 +94,7 @@ struct FunInfo
 	{
 		res  = false; // false by default
 		iter = 0;
+		case_sensitive = true;
 	}
 };
 
diff --git a/src/generator.h b/src/generator.h
index 6ba213b..1e29887 100755
--- a/src/generator.h
+++ b/src/generator.h
@@ -120,37 +120,54 @@ private:
 	std::vector<StreamType*> filter_tab;
 	const StreamType empty_stream;
 
+	// temporary streams used in [if..] [is...] or [for...]
+	StreamType stream_temp1, stream_temp2;
 
-	bool is_used;
+	// whether last function has put its content in case_sensitive (set FunInfo::case_sensitive)
+	bool last_case_sensitive;
 
+	// last result from a user function (FunInfo::res)
+	bool last_res;
 
-	// an empty string for info objects
+	// true if this Generator is working now
+	bool is_generator_working;
+
+	// an empty string for FunInfo objects
 	// when there is no any parameters
 	const std::wstring empty;
 
-
-	// a stack item for 'for' statements
-	// currently only one item (iteration)
+	// a stack item for [for] statements
+	// currently only one item (iterator)
 	struct StackItem
 	{
 		int iter;
 	};
 
-	// a stack for 'for' statements
+	// a stack for [for] statements
 	std::vector<StackItem> stack_tab;
 
+
 	void ResizeFilterTab();
 	void ClearFilterTab();
 	void ClearStream(StreamType & str);
 
+	template<class CharType>
+	CharType ToLower(CharType c);
+
+	template<class CharType>
+	bool StrCmpNc(CharType * str1, CharType * str2);
+
+	bool AreStreamsEqual(StreamType & str1, StreamType & str2, bool case_sensitive);
+
+
 	bool Find(const Item::Function & item_fun, typename Functions<StreamType>::Function ** function);
 	
 	void Call(typename Functions<StreamType>::Function * function, FunInfo<StreamType> & info);
 	void Call(typename Functions<StreamType>::Function * function, std::vector<std::wstring> & params,
-								 StreamType & out_stream, const StreamType & in_stream, bool * info_res = 0);
+								 StreamType & out_stream, bool clear_out_stream, const StreamType & in_stream);
 
-	bool Call(Item::Function & function, bool * info_res = 0, typename Functions<StreamType>::Function ** pfun = 0);
-	void Call(typename Functions<StreamType>::Function * function, std::vector<std::wstring> & params, bool * info_res = 0);
+	bool Call(Item::Function & item_fun, StreamType & out_stream, bool clear_out_stream);
+	bool Call(Item::Function & function);
 	
 
 	wchar_t CreateSpecialChar(wchar_t c);
@@ -181,6 +198,7 @@ private:
 	void MakeItemText(Item & item);
 	void MakeTextContainer(Item & item);
 	void MakeTextNormal(Item & item);
+	void MakeTextIs(Item & item, bool equal);
 	void MakeTextIs(Item & item);
 	void MakeTextIsno(Item & item);
 	void MakeTextDefine(Item & item);
@@ -209,7 +227,7 @@ Generator<StreamType>::Generator()
 	special_chars = false;
 	trim_white    = false;
 	skip_new_line = false;
-	is_used       = false;
+	is_generator_working = false;
 }
 
 
@@ -238,8 +256,8 @@ Generator<StreamType> & Generator<StreamType>::operator=(const Generator<StreamT
 	// don't copy filter tab
 	filter_tab.clear();
 
-	// don't copy 'is_used' flag
-	is_used = false;
+	// don't copy 'is_generator_working' flag
+	is_generator_working = false;
 
 return *this;
 }
@@ -295,6 +313,51 @@ void Generator<StreamType>::ClearStream(StreamType & str)
 }
 
 
+template<class StreamType>
+template<class CharType>
+CharType Generator<StreamType>::ToLower(CharType c)
+{
+	if( c>='A' && c<='Z' )
+		return c - 'A' + 'a';
+
+return c;
+}
+
+
+template<class StreamType>
+template<class CharType>
+bool Generator<StreamType>::StrCmpNc(CharType * str1, CharType * str2)
+{
+	for( ; ToLower(*str1) == ToLower(*str2) ; ++str1, ++str2)
+		if( *str1 == 0 )
+			return true;
+
+return false;
+}
+
+
+template<class StreamType>
+bool Generator<StreamType>::AreStreamsEqual(StreamType & str1, StreamType & str2, bool case_sensitive)
+{
+	if( case_sensitive )
+	{
+		#ifdef EZC_HAS_SPECIAL_STREAM
+			return str1.Str() == str2.Str();
+		#else
+			return str1.str() == str2.str();
+		#endif
+	}
+	else
+	{
+		#ifdef EZC_HAS_SPECIAL_STREAM
+			return StrCmpNc(str1.CStr(), str2.CStr());
+		#else
+			return StrCmpNc(str1.str().c_str(), str2.str().c_str());
+		#endif
+	}
+}
+
+
 template<class StreamType>
 void Generator<StreamType>::SetMax(int max_items_, int max_for_items_)
 {
@@ -335,7 +398,7 @@ void Generator<StreamType>::SetMaxFilters(size_t new_len)
 template<class StreamType>
 void Generator<StreamType>::Generate(StreamType * o, Pattern * p, Functions<StreamType> * f)
 {
-	if( is_used )
+	if( is_generator_working )
 	{
 		if( o )
 			CreateMsg(*o, L"generator busy");
@@ -357,13 +420,13 @@ void Generator<StreamType>::Generate(StreamType * o, Pattern * p, Functions<Stre
 	{
 		try
 		{
-			is_used = true;
+			is_generator_working = true;
 			MakeText( pattern->item_root );
-			is_used = false;
+			is_generator_working = false;
 		}
 		catch(...)
 		{
-			is_used = false;
+			is_generator_working = false;
 			throw;
 		}
 	}
@@ -430,9 +493,18 @@ void Generator<StreamType>::Call(typename Functions<StreamType>::Function * func
 		info.iter = stack_tab.back().iter;
 
 	if( function->type == Functions<StreamType>::function )
+	{
 		(function->user_function)(info);
+	}
 	else
+	{
+		info.out << function->variable;
 		info.res = !function->variable.empty();
+		info.case_sensitive = true;
+	}
+
+	last_res = info.res;
+	last_case_sensitive = info.case_sensitive;
 }
 
 
@@ -440,54 +512,49 @@ void Generator<StreamType>::Call(typename Functions<StreamType>::Function * func
 template<class StreamType>
 void Generator<StreamType>::Call(typename Functions<StreamType>::Function * function,
 								 std::vector<std::wstring> & params,
-								 StreamType & out_stream, const StreamType & in_stream,
-								 bool * info_res)
+								 StreamType & out_stream,
+								 bool clear_out_stream,
+								 const StreamType & in_stream)
 {
+	if( clear_out_stream )
+		ClearStream(out_stream);
+
 	if( params.empty() )
 	{
 		FunInfo<StreamType> info(out_stream, params, empty, in_stream);
 		Call(function, info);
-
-		if( info_res )
-			*info_res = info.res;
 	}
 	else
 	{
 		FunInfo<StreamType> info(out_stream, params, params[0], in_stream);
 		Call(function, info);
-
-		if( info_res )
-			*info_res = info.res;
 	}
 }
 
 
 
+
 // return: true if a function or variable was found and called
 template<class StreamType>
-bool Generator<StreamType>::Call(Item::Function & item_fun, bool * info_res, typename Functions<StreamType>::Function ** pfun)
+bool Generator<StreamType>::Call(Item::Function & item_fun, StreamType & out_stream, bool clear_out_stream)
 {
 typename Functions<StreamType>::Function * fun;
 
 	if( !Find(item_fun, &fun) )
 		return false;
 
-	Call(fun, item_fun.params, *output_stream, empty_stream, info_res);
-
-	if( pfun )
-		*pfun = fun;
+	Call(fun, item_fun.params, out_stream, clear_out_stream, empty_stream);
 
 return true;
 }
 
 
 
-
-// it calls the function pointed by pfun
+// return: true if a function or variable was found and called
 template<class StreamType>
-void Generator<StreamType>::Call(typename Functions<StreamType>::Function * function, std::vector<std::wstring> & params, bool * info_res)
+bool Generator<StreamType>::Call(Item::Function & item_fun)
 {
-	Call(function, params, *output_stream, empty_stream, info_res);
+	return Call(item_fun, stream_temp1, true);
 }
 
 
@@ -725,11 +792,7 @@ void Generator<StreamType>::MakeTextNormal(Item & item)
 	if( item.functions.size() != 1 )
 		return;
 
-	typename Functions<StreamType>::Function * pfun;
-	bool called = Call(item.functions[0], 0, &pfun);
-
-	if( called && pfun->type == Functions<StreamType>::variable )
-		(*output_stream) << pfun->variable;
+	Call(item.functions[0], *output_stream, false);
 }
 
 
@@ -755,30 +818,26 @@ void Generator<StreamType>::MakeTextIf_go(Item & item, bool result)
 template<class StreamType>
 void Generator<StreamType>::MakeTextIf(Item & item)
 {
-bool info_res;
-
 	if( item.functions.size() != 1 )
 		return;
 
-	if( !Call(item.functions[0], &info_res) )
+	if( !Call(item.functions[0]) )
 		return;
 
-	MakeTextIf_go(item, info_res);
+	MakeTextIf_go(item, last_res);
 }
 
 
 template<class StreamType>
 void Generator<StreamType>::MakeTextIfno(Item & item)
 {
-bool info_res;
-
 	if( item.functions.size() != 1 )
 		return;
 
-	if( !Call(item.functions[0], &info_res) )
+	if( !Call(item.functions[0]) )
 		return;
 
-	MakeTextIf_go(item, !info_res);
+	MakeTextIf_go(item, !last_res);
 }
 
 
@@ -787,14 +846,13 @@ void Generator<StreamType>::MakeTextIfany(Item & item)
 {
 	std::vector<typename Item::Function>::iterator d = item.functions.begin();
 	unsigned how_many_true = 0;
-	bool info_res;
 
 	for( ; d != item.functions.end() ; ++d )
 	{
-		if( !Call(*d, &info_res) )
+		if( !Call(*d) )
 			return;
 
-		if( info_res )
+		if( last_res )
 			++how_many_true;
 	}
 
@@ -807,15 +865,16 @@ void Generator<StreamType>::MakeTextIfone(Item & item)
 {
 	std::vector<typename Item::Function>::iterator d = item.functions.begin();
 	unsigned how_many_true = 0;
-	bool info_res;
 
 	for( ; d != item.functions.end() ; ++d )
 	{
-		if( Call(*d, &info_res) && info_res )
+		if( Call(*d) )
 		{
-			// there is no sense to go through all functions
-			++how_many_true;
-			break;
+			if( last_res )
+			{
+				++how_many_true;
+				break; // there is no sense to go through all functions
+			}
 		}
 	}
 
@@ -828,14 +887,13 @@ void Generator<StreamType>::MakeTextIfanyno(Item & item)
 {
 	std::vector<typename Item::Function>::iterator d = item.functions.begin();
 	unsigned how_many_true = 0;
-	bool info_res;
 
 	for( ; d != item.functions.end() ; ++d )
 	{
-		if( !Call(*d, &info_res) )
+		if( !Call(*d) )
 			return;
 
-		if( info_res )
+		if( last_res )
 			++how_many_true;
 	}
 
@@ -848,12 +906,17 @@ void Generator<StreamType>::MakeTextIfoneno(Item & item)
 {
 	std::vector<typename Item::Function>::iterator d = item.functions.begin();
 	unsigned how_many_false = 0;
-	bool info_res;
 
 	for( ; d != item.functions.end() ; ++d )
 	{
-		if( Call(*d, &info_res) && !info_res )
-			++how_many_false;
+		if( Call(*d) )
+		{
+			if( !last_res )
+			{
+				++how_many_false;
+				break;
+			}
+		}
 	}
 
 	MakeTextIf_go(item, how_many_false > 0);
@@ -862,38 +925,49 @@ void Generator<StreamType>::MakeTextIfoneno(Item & item)
 
 
 template<class StreamType>
-void Generator<StreamType>::MakeTextIs(Item & item)
+void Generator<StreamType>::MakeTextIs(Item & item, bool equal)
 {
-bool info_res1, info_res2;
-
 	if( item.functions.size() != 2 )
 		return;
 
-	if( !Call(item.functions[0], &info_res1) )
+	// if one of these two functions has set case_sensitive to false
+	// then we compare in case insensitive mode
+	bool case_sensitive = true;
+
+	if( !Call(item.functions[0], stream_temp1, true) )
 		return;
 
-	if( !Call(item.functions[1], &info_res2) )
+	if( !last_case_sensitive )
+		case_sensitive = false;
+
+	if( !Call(item.functions[1], stream_temp2, true) )
 		return;
+
+	if( !last_case_sensitive )
+		case_sensitive = false;
 	
-	MakeTextIf_go(item, info_res1 == info_res2);
+	bool res = AreStreamsEqual(stream_temp1, stream_temp2, case_sensitive);
+
+	if( !equal )
+		res = !res;
+
+	MakeTextIf_go(item, res);
 }
 
 
+
+template<class StreamType>
+void Generator<StreamType>::MakeTextIs(Item & item)
+{
+	MakeTextIs(item, true);
+}
+
+
+
 template<class StreamType>
 void Generator<StreamType>::MakeTextIsno(Item & item)
 {
-bool info_res1, info_res2;
-
-	if( item.functions.size() != 2 )
-		return;
-
-	if( !Call(item.functions[0], &info_res1) )
-		return;
-
-	if( !Call(item.functions[1], &info_res2) )
-		return;
-	
-	MakeTextIf_go(item, info_res1 != info_res2);
+	MakeTextIs(item, false);
 }
 
 
@@ -965,8 +1039,6 @@ void Generator<StreamType>::MakeTextIfindex(Item & item)
 template<class StreamType>
 void Generator<StreamType>::MakeTextForLoop(Item & item, typename Functions<StreamType>::Function * function)
 {
-bool info_res;
-
 	for( ; !break_generating ; stack_tab.back().iter += 1 )
 	{
 		if( stack_tab.back().iter >= max_for_items )
@@ -976,9 +1048,9 @@ bool info_res;
 			break;
 		}
 
-		Call(function, item.functions[0].params, &info_res);
+		Call(function, item.functions[0].params, stream_temp1, true, empty_stream);
 
-		if( !info_res )
+		if( !last_res )
 			break;
 
 		if( !item.item_tab.empty() )
@@ -1074,7 +1146,7 @@ void Generator<StreamType>::MakeTextFilter(Item & item)
 	if( !item.item_tab.empty() )
 		MakeText( *item.item_tab[0] ); // should be only one item - item_container
 
-	Call(function, item.functions[0].params, *old_stream, *output_stream);
+	Call(function, item.functions[0].params, *old_stream, false, *output_stream);
 
 	output_stream = old_stream;
 	filter_index -= 1;
diff --git a/src/item.cpp b/src/item.cpp
index d1730a6..b748026 100755
--- a/src/item.cpp
+++ b/src/item.cpp
@@ -5,7 +5,7 @@
  */
 
 /* 
- * Copyright (c) 2007-2010, Tomasz Sowa
+ * Copyright (c) 2007-2011, Tomasz Sowa
  * All rights reserved.
  * 
  * Redistribution and use in source and binary forms, with or without