do not fallback to epsilon in trees while printing

alib2data/src/tree/ranked/PrefixRankedBarPattern.cpp

@@ -147,7 +147,7 @@ bool PrefixRankedBarPattern::isEmpty ( ) const {
 }
 int PrefixRankedBarPattern::compare ( const PrefixRankedBarPattern & other ) const {
-	auto first	= std::tie ( m_Data, alphabet );
+	auto first = std::tie ( m_Data, alphabet );
 	auto second = std::tie ( other.m_Data, other.alphabet );
 	std::compare < decltype ( first ) > comp;
@@ -156,32 +156,22 @@ int PrefixRankedBarPattern::compare ( const PrefixRankedBarPattern & other ) con
 }
 void PrefixRankedBarPattern::operator >>( std::ostream & out ) const {
-	if ( this->isEmpty ( ) ) {
-		out << "(Epsilon)";
-	} else {
-		out << "(PrefixRankedBarPattern ";
-		for ( const alphabet::RankedSymbol & symbol : this->m_Data )
-			out << symbol;
-		out << ")";
-	}
+	out << "(PrefixRankedBarPattern ";
+	for ( const alphabet::RankedSymbol & symbol : this->m_Data )
+		out << symbol;
+	out << ")";
 }
 PrefixRankedBarPattern::operator std::string ( ) const {
 	std::stringstream ss;
-	if ( this->isEmpty ( ) ) {
-		ss << "E";
-	} else {
-		ss << "\"";
-
-		for ( const alphabet::RankedSymbol & symbol : this->m_Data )
-			ss << ( std::string ) symbol;
-
-		ss << "\"";
-	}
+	ss << "\"";
+	for ( const alphabet::RankedSymbol & symbol : this->m_Data )
+		ss << ( std::string ) symbol;
+	ss << "\"";
 	return std::move ( ss ).str ( );
 }

alib2data/src/tree/ranked/PrefixRankedBarTree.cpp

@@ -123,8 +123,8 @@ bool PrefixRankedBarTree::isEmpty ( ) const {
 }
 int PrefixRankedBarTree::compare ( const PrefixRankedBarTree & other ) const {
-	auto first	= std::tie ( m_Data, alphabet );
-	auto second = std::tie ( other.m_Data, other.alphabet );
+	auto first = std::tie ( m_Data, getAlphabet() );
+	auto second = std::tie ( other.m_Data, other.getAlphabet() );
 	std::compare < decltype ( first ) > comp;
@@ -132,32 +132,22 @@ int PrefixRankedBarTree::compare ( const PrefixRankedBarTree & other ) const {
 }
 void PrefixRankedBarTree::operator >>( std::ostream & out ) const {
-	if ( this->isEmpty ( ) ) {
-		out << "(Epsilon)";
-	} else {
-		out << "(PrefixRankedBarTree ";
-		for ( const alphabet::RankedSymbol & symbol : this->m_Data )
-			out << symbol;
-		out << ")";
-	}
+	out << "(PrefixRankedBarTree ";
+	for ( const alphabet::RankedSymbol & symbol : this->m_Data )
+		out << symbol;
+	out << ")";
 }
 PrefixRankedBarTree::operator std::string ( ) const {
 	std::stringstream ss;
-	if ( this->isEmpty ( ) ) {
-		ss << "E";
-	} else {
-		ss << "\"";
-
-		for ( const alphabet::RankedSymbol & symbol : this->m_Data )
-			ss << ( std::string ) symbol;
-
-		ss << "\"";
-	}
+	ss << "\"";
+	for ( const alphabet::RankedSymbol & symbol : this->m_Data )
+		ss << ( std::string ) symbol;
+	ss << "\"";
 	return std::move ( ss ).str ( );
 }

alib2data/src/tree/ranked/PrefixRankedPattern.cpp

@@ -112,7 +112,7 @@ bool PrefixRankedPattern::isEmpty ( ) const {
 }
 int PrefixRankedPattern::compare ( const PrefixRankedPattern & other ) const {
-	auto first	= std::tie ( m_Data, alphabet );
+	auto first = std::tie ( m_Data, alphabet );
 	auto second = std::tie ( other.m_Data, other.alphabet );
 	std::compare < decltype ( first ) > comp;
@@ -121,32 +121,22 @@ int PrefixRankedPattern::compare ( const PrefixRankedPattern & other ) const {
 }
 void PrefixRankedPattern::operator >>( std::ostream & out ) const {
-	if ( this->isEmpty ( ) ) {
-		out << "(Epsilon)";
-	} else {
-		out << "(PrefixRankedPattern ";
-		for ( const alphabet::RankedSymbol & symbol : this->m_Data )
-			out << symbol;
-		out << ")";
-	}
+	out << "(PrefixRankedPattern ";
+	for ( const alphabet::RankedSymbol & symbol : this->m_Data )
+		out << symbol;
+	out << ")";
 }
 PrefixRankedPattern::operator std::string ( ) const {
 	std::stringstream ss;
-	if ( this->isEmpty ( ) ) {
-		ss << "E";
-	} else {
-		ss << "\"";
-
-		for ( const alphabet::RankedSymbol & symbol : this->m_Data )
-			ss << ( std::string ) symbol;
-
-		ss << "\"";
-	}
+	ss << "\"";
+	for ( const alphabet::RankedSymbol & symbol : this->m_Data )
+		ss << ( std::string ) symbol;
+	ss << "\"";
 	return std::move ( ss ).str ( );
 }

alib2data/src/tree/ranked/PrefixRankedTree.cpp

@@ -99,7 +99,7 @@ bool PrefixRankedTree::isEmpty ( ) const {
 }
 int PrefixRankedTree::compare ( const PrefixRankedTree & other ) const {
-	auto first	= std::tie ( m_Data, alphabet );
+	auto first = std::tie ( m_Data, alphabet );
 	auto second = std::tie ( other.m_Data, other.alphabet );
 	std::compare < decltype ( first ) > comp;
@@ -108,32 +108,22 @@ int PrefixRankedTree::compare ( const PrefixRankedTree & other ) const {
 }
 void PrefixRankedTree::operator >>( std::ostream & out ) const {
-	if ( this->isEmpty ( ) ) {
-		out << "(Epsilon)";
-	} else {
-		out << "(PrefixRankedTree ";
-		for ( const alphabet::RankedSymbol & symbol : this->m_Data )
-			out << symbol;
-		out << ")";
-	}
+	out << "(PrefixRankedTree ";
+	for ( const alphabet::RankedSymbol & symbol : this->m_Data )
+		out << symbol;
+	out << ")";
 }
 PrefixRankedTree::operator std::string ( ) const {
 	std::stringstream ss;
-	if ( this->isEmpty ( ) ) {
-		ss << "E";
-	} else {
-		ss << "\"";
-
-		for ( const alphabet::RankedSymbol & symbol : this->m_Data )
-			ss << ( std::string ) symbol;
-
-		ss << "\"";
-	}
+	ss << "\"";
+	for ( const alphabet::RankedSymbol & symbol : this->m_Data )
+		ss << ( std::string ) symbol;
+	ss << "\"";
 	return std::move ( ss ).str ( );
 }

alib2data/src/tree/unranked/PrefixBarTree.cpp

@@ -107,32 +107,22 @@ int PrefixBarTree::compare ( const PrefixBarTree & other ) const {
 }
 void PrefixBarTree::operator >>( std::ostream & out ) const {
-	if ( this->isEmpty ( ) ) {
-		out << "(Epsilon)";
-	} else {
-		out << "(PrefixBarTree ";
-		for ( const alphabet::Symbol & symbol : this->m_Data )
-			out << symbol;
-		out << ")";
-	}
+	out << "(PrefixBarTree ";
+	for ( const alphabet::Symbol & symbol : this->m_Data )
+		out << symbol;
+	out << ")";
 }
 PrefixBarTree::operator std::string ( ) const {
 	std::stringstream ss;
-	if ( this->isEmpty ( ) ) {
-		ss << "E";
-	} else {
-		ss << "\"";
-
-		for ( const alphabet::Symbol & symbol : this->m_Data )
-			ss << ( std::string ) symbol;
-
-		ss << "\"";
-	}
+	ss << "\"";
+	for ( const alphabet::Symbol & symbol : this->m_Data )
+		ss << ( std::string ) symbol;
+	ss << "\"";
 	return std::move ( ss ).str ( );
 }