NullableNonterminals visitor

alib2algo/src/grammar/properties/NullableNonterminals.cpp

@@ -17,7 +17,9 @@
 #include <grammar/Regular/RightLG.h>
 #include <grammar/Regular/RightRG.h>
-#include <std/set.hpp>
+#include <set>
+#include <deque>
+#include <algorithm>
 namespace grammar {
@@ -59,6 +61,75 @@ template std::set<alphabet::Symbol> NullableNonterminals::getNullableNonterminal
 template std::set<alphabet::Symbol> NullableNonterminals::getNullableNonterminals( const grammar::RightLG& grammar );
 template std::set<alphabet::Symbol> NullableNonterminals::getNullableNonterminals( const grammar::RightRG& grammar );
+std::set<alphabet::Symbol> NullableNonterminals::getNullableNonterminals(const grammar::Grammar& grammar) {
+	std::set<alphabet::Symbol> out;
+	grammar.getData().Accept((void*) &out, NullableNonterminals::NULLABLE_NONTERMINALS);
+	return out;
+}
+
+void NullableNonterminals::Visit(void* data, const grammar::LeftLG& grammar) const {
+	std::set<alphabet::Symbol> & out = *((std::set<alphabet::Symbol>*) data);
+	out = std::move(this->getNullableNonterminals(grammar));
+}
+
+void NullableNonterminals::Visit(void* data, const grammar::LeftRG& grammar) const {
+	std::set<alphabet::Symbol> & out = *((std::set<alphabet::Symbol>*) data);
+	out = std::move(this->getNullableNonterminals(grammar));
+}
+
+void NullableNonterminals::Visit(void* data, const grammar::RightLG& grammar) const {
+	std::set<alphabet::Symbol> & out = *((std::set<alphabet::Symbol>*) data);
+	out = std::move(this->getNullableNonterminals(grammar));
+}
+
+void NullableNonterminals::Visit(void* data, const grammar::RightRG& grammar) const {
+	std::set<alphabet::Symbol> & out = *((std::set<alphabet::Symbol>*) data);
+	out = std::move(this->getNullableNonterminals(grammar));
+}
+
+void NullableNonterminals::Visit(void* data, const grammar::LG& grammar) const {
+	std::set<alphabet::Symbol> & out = *((std::set<alphabet::Symbol>*) data);
+	out = std::move(this->getNullableNonterminals(grammar));
+}
+
+void NullableNonterminals::Visit(void* data, const grammar::CFG& grammar) const {
+	std::set<alphabet::Symbol> & out = *((std::set<alphabet::Symbol>*) data);
+	out = std::move(this->getNullableNonterminals(grammar));
+}
+
+void NullableNonterminals::Visit(void* data, const grammar::EpsilonFreeCFG& grammar) const {
+	std::set<alphabet::Symbol> & out = *((std::set<alphabet::Symbol>*) data);
+	out = std::move(this->getNullableNonterminals(grammar));
+}
+
+void NullableNonterminals::Visit(void* data, const grammar::CNF& grammar) const {
+	std::set<alphabet::Symbol> & out = *((std::set<alphabet::Symbol>*) data);
+	out = std::move(this->getNullableNonterminals(grammar));
+}
+
+void NullableNonterminals::Visit(void* data, const grammar::GNF& grammar) const {
+	std::set<alphabet::Symbol> & out = *((std::set<alphabet::Symbol>*) data);
+	out = std::move(this->getNullableNonterminals(grammar));
+}
+
+void NullableNonterminals::Visit(void*, const grammar::CSG&) const {
+	throw exception::AlibException("Unsupported grammar type CSG");
+}
+
+void NullableNonterminals::Visit(void*, const grammar::NonContractingGrammar&) const {
+	throw exception::AlibException("Unsupported grammar type NonConctractingGrammar");
+}
+
+void NullableNonterminals::Visit(void*, const grammar::ContextPreservingUnrestrictedGrammar&) const {
+	throw exception::AlibException("Unsupported grammar type ContextPreservingUnrestrictedGrammar");
+}
+
+void NullableNonterminals::Visit(void*, const grammar::UnrestrictedGrammar&) const {
+	throw exception::AlibException("Unsupported grammar type UnrestrictedGrammar");
+}
+
+const NullableNonterminals NullableNonterminals::NULLABLE_NONTERMINALS;
+
 } /* namespace properties */
 } /* namespace grammar */

alib2algo/src/grammar/properties/NullableNonterminals.h

@@ -8,12 +8,7 @@
 #ifndef NULLABLE_NONTERMINALS_H_
 #define NULLABLE_NONTERMINALS_H_
-#include <algorithm>
-#include <deque>
-#include <set>
-
-#include <exception/AlibException.h>
-
+#include <grammar/Grammar.h>
 #include <alphabet/Symbol.h>
 namespace grammar {
@@ -23,8 +18,10 @@ namespace properties {
 /**
  * Implements algorithms from Melichar, chapter 3.3
  */
-class NullableNonterminals {
+class NullableNonterminals : public grammar::VisitableGrammarBase::const_visitor_type {
 public:
+	static std::set<alphabet::Symbol> getNullableNonterminals( const grammar::Grammar & grammar );
+
 	/**
 	 * Retrieve all nullable nonterminals from grammar
 	 * Nullable nonterminal is such nonterminal A for which holds that A ->^* \eps
@@ -36,6 +33,23 @@ public:
 	 */
 	template<class T>
 	static std::set<alphabet::Symbol> getNullableNonterminals(const T& grammar);
+
+private:
+	void Visit(void*, const grammar::LeftLG& grammar) const;
+	void Visit(void*, const grammar::LeftRG& grammar) const;
+	void Visit(void*, const grammar::RightLG& grammar) const;
+	void Visit(void*, const grammar::RightRG& grammar) const;
+	void Visit(void*, const grammar::LG& grammar) const;
+	void Visit(void*, const grammar::CFG& grammar) const;
+	void Visit(void*, const grammar::EpsilonFreeCFG& grammar) const;
+	void Visit(void*, const grammar::CNF& grammar) const;
+	void Visit(void*, const grammar::GNF& grammar) const;
+	void Visit(void*, const grammar::CSG& grammar) const;
+	void Visit(void*, const grammar::NonContractingGrammar& grammar) const;
+	void Visit(void*, const grammar::ContextPreservingUnrestrictedGrammar& grammar) const;
+	void Visit(void*, const grammar::UnrestrictedGrammar& grammar) const;
+
+	static const NullableNonterminals NULLABLE_NONTERMINALS;
 };
 } /* namespace properties */