Refactoring

src/translate/common.rs

@@ -1,43 +1,27 @@
-pub(crate) trait FindOrCreateFunctionDeclaration = FnMut(&str, usize)
+pub(crate) trait FindOrCreateFunctionDeclaration
+{
+	fn find_or_create(&mut self, name: &str, arity: usize)
 		-> std::rc::Rc<foliage::FunctionDeclaration>;
+}
 
-pub(crate) trait FindOrCreatePredicateDeclaration = FnMut(&str, usize)
+pub(crate) trait FindOrCreatePredicateDeclaration
+{
+	fn find_or_create(&mut self, name: &str, arity: usize)
 		-> std::rc::Rc<foliage::PredicateDeclaration>;
+}
 
-pub(crate) trait FindOrCreateVariableDeclaration = FnMut(&str)
+pub(crate) trait FindOrCreateVariableDeclaration
+{
+	fn find_or_create(&mut self, name: &str)
 		-> std::rc::Rc<foliage::VariableDeclaration>;
-
-pub(crate) fn find_or_create_predicate_declaration(predicate_declarations: &mut foliage::PredicateDeclarations,
-	name: &str, arity: usize)
-	-> std::rc::Rc<foliage::PredicateDeclaration>
-{
-	match predicate_declarations.iter()
-		.find(|x| x.name == name && x.arity == arity)
-	{
-		Some(value) => std::rc::Rc::clone(value),
-		None =>
-		{
-			let declaration = foliage::PredicateDeclaration
-			{
-				name: name.to_owned(),
-				arity,
-			};
-			let declaration = std::rc::Rc::new(declaration);
-
-			predicate_declarations.insert(std::rc::Rc::clone(&declaration));
-
-			log::debug!("new predicate declaration: {}/{}", name, arity);
-
-			declaration
-		},
-	}
 }
 
-pub(crate) fn find_or_create_function_declaration(function_declarations: &mut foliage::FunctionDeclarations,
+impl FindOrCreateFunctionDeclaration for foliage::FunctionDeclarations
-	name: &str, arity: usize)
+{
+	fn find_or_create(&mut self, name: &str, arity: usize)
 		-> std::rc::Rc<foliage::FunctionDeclaration>
 	{
-	match function_declarations.iter()
+		match self.iter()
 			.find(|x| x.name == name && x.arity == arity)
 		{
 			Some(value) => std::rc::Rc::clone(value),
@@ -50,7 +34,7 @@ pub(crate) fn find_or_create_function_declaration(function_declarations: &mut fo
 				};
 				let declaration = std::rc::Rc::new(declaration);
 
-			function_declarations.insert(std::rc::Rc::clone(&declaration));
+				self.insert(std::rc::Rc::clone(&declaration));
 
 				log::debug!("new function declaration: {}/{}", name, arity);
 
@@ -58,6 +42,83 @@ pub(crate) fn find_or_create_function_declaration(function_declarations: &mut fo
 			},
 		}
 	}
+}
+
+impl FindOrCreatePredicateDeclaration for foliage::PredicateDeclarations
+{
+	fn find_or_create(&mut self, name: &str, arity: usize)
+		-> std::rc::Rc<foliage::PredicateDeclaration>
+	{
+		match self.iter()
+			.find(|x| x.name == name && x.arity == arity)
+		{
+			Some(value) => std::rc::Rc::clone(value),
+			None =>
+			{
+				let declaration = foliage::PredicateDeclaration
+				{
+					name: name.to_owned(),
+					arity,
+				};
+				let declaration = std::rc::Rc::new(declaration);
+
+				self.insert(std::rc::Rc::clone(&declaration));
+
+				log::debug!("new predicate declaration: {}/{}", name, arity);
+
+				declaration
+			},
+		}
+	}
+}
+
+impl FindOrCreateVariableDeclaration for foliage::VariableDeclarationStack
+{
+	fn find_or_create(&mut self, name: &str)
+		-> std::rc::Rc<foliage::VariableDeclaration>
+	{
+		// TODO: check correctness
+		if name == "_"
+		{
+			let variable_declaration = foliage::VariableDeclaration
+			{
+				name: "_".to_owned(),
+			};
+			let variable_declaration = std::rc::Rc::new(variable_declaration);
+
+			self.free_variable_declarations.insert(
+				std::rc::Rc::clone(&variable_declaration));
+
+			return variable_declaration;
+		}
+
+		self.find_or_create(name)
+	}
+}
+
+pub(crate) fn translate_binary_operator(binary_operator: clingo::ast::BinaryOperator)
+	-> Result<foliage::BinaryOperator, crate::Error>
+{
+	match binary_operator
+	{
+		clingo::ast::BinaryOperator::And
+		| clingo::ast::BinaryOperator::Or
+		| clingo::ast::BinaryOperator::Xor
+			=> return Err(crate::Error::new_unsupported_language_feature("binary logical operators")),
+		clingo::ast::BinaryOperator::Plus
+			=> Ok(foliage::BinaryOperator::Addition),
+		clingo::ast::BinaryOperator::Minus
+			=> Ok(foliage::BinaryOperator::Subtraction),
+		clingo::ast::BinaryOperator::Multiplication
+			=> Ok(foliage::BinaryOperator::Multiplication),
+		clingo::ast::BinaryOperator::Division
+			=> Ok(foliage::BinaryOperator::Division),
+		clingo::ast::BinaryOperator::Modulo
+			=> Ok(foliage::BinaryOperator::Modulo),
+		clingo::ast::BinaryOperator::Power
+			=> Ok(foliage::BinaryOperator::Exponentiation),
+	}
+}
 
 pub(crate) fn translate_comparison_operator(comparison_operator: clingo::ast::ComparisonOperator)
 	-> foliage::ComparisonOperator
@@ -96,13 +157,11 @@ pub(crate) fn choose_value_in_primitive(term: Box<foliage::Term>,
 	}
 }
 
-pub(crate) fn choose_value_in_term<F1, F2>(term: &clingo::ast::Term,
+pub(crate) fn choose_value_in_term(term: &clingo::ast::Term,
 	variable_declaration: &std::rc::Rc<foliage::VariableDeclaration>,
-	mut find_or_create_function_declaration: F1, mut find_or_create_variable_declaration: F2)
+	function_declarations: &mut foliage::FunctionDeclarations,
+	variable_declaration_stack: &mut foliage::VariableDeclarationStack)
 	-> Result<foliage::Formula, crate::Error>
-where
-	F1: FindOrCreateFunctionDeclaration,
-	F2: FindOrCreateVariableDeclaration,
 {
 	match term.term_type()
 	{
@@ -139,7 +198,7 @@ where
 				let constant_name = symbol.name()
 					.map_err(|error| crate::Error::new_logic("clingo error").with(error))?;
 
-				let constant_declaration = find_or_create_function_declaration(constant_name, 0);
+				let constant_declaration = function_declarations.find_or_create(constant_name, 0);
 
 				let function = foliage::Term::Function(foliage::Function
 				{
@@ -150,8 +209,18 @@ where
 				Ok(foliage::Formula::Comparison(choose_value_in_primitive(Box::new(function), variable_declaration)))
 			}
 		},
-		clingo::ast::TermType::Variable(variable) =>
+		clingo::ast::TermType::Variable(variable_name) =>
-			Err(crate::Error::new_not_yet_implemented("todo")),
+		{
+			let other_variable_declaration = variable_declaration_stack.find_or_create(variable_name);
+
+			let other_variable = foliage::Term::Variable(foliage::Variable
+			{
+				declaration: other_variable_declaration,
+			});
+
+			Ok(foliage::Formula::Comparison(choose_value_in_primitive(Box::new(other_variable),
+				variable_declaration)))
+		},
 		_ => Err(crate::Error::new_not_yet_implemented("todo")),
 	}
 }

src/translate/verify_properties.rs

@@ -12,31 +12,32 @@ pub struct ScopedFormula
 
 pub struct Definitions
 {
-	head_atom_parameters: foliage::VariableDeclarations,
+	head_atom_parameters: std::rc::Rc<foliage::VariableDeclarations>,
 	definitions: Vec<ScopedFormula>,
 }
 
 pub fn read(rule: &clingo::ast::Rule) -> Result<(), crate::Error>
 {
+	use super::common::FindOrCreatePredicateDeclaration;
+
 	let mut function_declarations = foliage::FunctionDeclarations::new();
 	let mut predicate_declarations = foliage::PredicateDeclarations::new();
 	let mut variable_declaration_stack = foliage::VariableDeclarationStack::new();
 
 	let head_type = determine_head_type(rule.head(),
-		|name, arity| super::common::find_or_create_predicate_declaration(
+		|name, arity| predicate_declarations.find_or_create(name, arity))?;
-			&mut predicate_declarations, name, arity))?;
 
 	let mut definitions
 		= std::collections::BTreeMap::<std::rc::Rc<foliage::PredicateDeclaration>, Definitions>::new();
 
 	let declare_predicate_parameters = |predicate_declaration: &foliage::PredicateDeclaration|
 	{
-		(0..predicate_declaration.arity)
+		std::rc::Rc::new((0..predicate_declaration.arity)
 			.map(|_| std::rc::Rc::new(foliage::VariableDeclaration
 				{
 					name: "<anonymous>".to_string(),
 				}))
-			.collect()
+			.collect())
 	};
 
 	match head_type
@@ -54,8 +55,15 @@ pub fn read(rule: &clingo::ast::Rule) -> Result<(), crate::Error>
 			}
 
 			let definitions = definitions.get(&head_atom.predicate_declaration).unwrap();
+
+			variable_declaration_stack.push(std::rc::Rc::clone(&definitions.head_atom_parameters));
+
+			let translated_body = translate_body(rule.body(), &mut function_declarations,
+				&mut predicate_declarations, &mut variable_declaration_stack);
+
+			variable_declaration_stack.pop();
 		},
-		HeadType::ChoiceWithSingleAtom(test) =>
+		HeadType::ChoiceWithSingleAtom(_) =>
 			log::debug!("translating choice rule with single atom"),
 		HeadType::IntegrityConstraint =>
 			log::debug!("translating integrity constraint"),

src/translate/verify_properties/translate_body.rs

@@ -1,12 +1,11 @@
-pub(crate) fn translate_body_term<F1, F2, F3>(body_term: &clingo::ast::Term, sign: clingo::ast::Sign,
+pub(crate) fn translate_body_term(body_term: &clingo::ast::Term, sign: clingo::ast::Sign,
-	mut find_or_create_function_declaration: F1, mut find_or_create_predicate_declaration: F2,
+	mut function_declarations: &mut foliage::FunctionDeclarations,
-	mut find_or_create_variable_declaration: F3)
+	predicate_declarations: &mut foliage::PredicateDeclarations,
+	mut variable_declaration_stack: &mut foliage::VariableDeclarationStack)
 	-> Result<foliage::Formula, crate::Error>
-where
-	F1: crate::translate::common::FindOrCreateFunctionDeclaration,
-	F2: crate::translate::common::FindOrCreatePredicateDeclaration,
-	F3: crate::translate::common::FindOrCreateVariableDeclaration,
 {
+	use crate::translate::common::FindOrCreatePredicateDeclaration;
+
 	let function = match body_term.term_type()
 	{
 		clingo::ast::TermType::Function(value) => value,
@@ -15,7 +14,7 @@ where
 
 	let function_name = function.name().map_err(|error| crate::Error::new_decode_identifier(error))?;
 
-	let predicate_declaration = find_or_create_predicate_declaration(function_name,
+	let predicate_declaration = predicate_declarations.find_or_create(function_name,
 		function.arguments().len());
 
 	let parameters = function.arguments().iter().map(|_| std::rc::Rc::new(
@@ -54,7 +53,7 @@ where
 	let mut arguments = function.arguments().iter().map(|x|
 		{
 			let result = crate::translate::common::choose_value_in_term(x, &parameters[i],
-				&mut find_or_create_function_declaration, &mut find_or_create_variable_declaration)
+				&mut function_declarations, &mut variable_declaration_stack)
 				.map(|x| Box::new(x));
 			i += 1;
 			result
@@ -72,14 +71,11 @@ where
 	}))
 }
 
-pub(crate) fn translate_body_literal<F1, F2, F3>(body_literal: &clingo::ast::BodyLiteral,
+pub(crate) fn translate_body_literal(body_literal: &clingo::ast::BodyLiteral,
-	mut find_or_create_function_declaration: F1, mut find_or_create_predicate_declaration: F2,
+	mut function_declarations: &mut foliage::FunctionDeclarations,
-	mut find_or_create_variable_declaration: F3)
+	mut predicate_declarations: &mut foliage::PredicateDeclarations,
+	mut variable_declaration_stack: &mut foliage::VariableDeclarationStack)
 	-> Result<foliage::Formula, crate::Error>
-where
-	F1: crate::translate::common::FindOrCreateFunctionDeclaration,
-	F2: crate::translate::common::FindOrCreatePredicateDeclaration,
-	F3: crate::translate::common::FindOrCreateVariableDeclaration,
 {
 	match body_literal.sign()
 	{
@@ -108,8 +104,8 @@ where
 			Ok(foliage::Formula::Boolean(value))
 		},
 		clingo::ast::LiteralType::Symbolic(term) => translate_body_term(term, literal.sign(),
-			&mut find_or_create_function_declaration, &mut find_or_create_predicate_declaration,
+			&mut function_declarations, &mut predicate_declarations,
-			&mut find_or_create_variable_declaration),
+			&mut variable_declaration_stack),
 		clingo::ast::LiteralType::Comparison(comparison) =>
 		{
 			let new_variable_declaration = || std::rc::Rc::new(foliage::VariableDeclaration
@@ -123,9 +119,9 @@ where
 			let parameter_z2 = &parameters[1];
 
 			let choose_z1_in_t1 = crate::translate::common::choose_value_in_term(comparison.left(), &parameter_z1,
-				&mut find_or_create_function_declaration, &mut find_or_create_variable_declaration)?;
+				&mut function_declarations, &mut variable_declaration_stack)?;
 			let choose_z2_in_t2 = crate::translate::common::choose_value_in_term(comparison.right(), &parameter_z2,
-				&mut find_or_create_function_declaration, &mut find_or_create_variable_declaration)?;
+				&mut function_declarations, &mut variable_declaration_stack)?;
 
 			let variable_1 = foliage::Variable
 			{
@@ -161,19 +157,15 @@ where
 	}
 }
 
-pub(crate) fn translate_body<F1, F2, F3>(body_literals: &[clingo::ast::BodyLiteral],
+pub(crate) fn translate_body(body_literals: &[clingo::ast::BodyLiteral],
-	mut find_or_create_function_declaration: F1, mut find_or_create_predicate_declaration: F2,
+	mut function_declaration: &mut foliage::FunctionDeclarations,
-	mut find_or_create_variable_declaration: F3)
+	mut predicate_declaration: &mut foliage::PredicateDeclarations,
+	mut variable_declaration_stack: &mut foliage::VariableDeclarationStack)
 	-> Result<foliage::Formulas, crate::Error>
-where
-	F1: crate::translate::common::FindOrCreateFunctionDeclaration,
-	F2: crate::translate::common::FindOrCreatePredicateDeclaration,
-	F3: crate::translate::common::FindOrCreateVariableDeclaration,
 {
 	body_literals.iter()
-		.map(|body_literal| translate_body_literal(body_literal,
+		.map(|body_literal| translate_body_literal(body_literal, &mut function_declaration,
-			&mut find_or_create_function_declaration, &mut find_or_create_predicate_declaration,
+			&mut predicate_declaration, &mut variable_declaration_stack)
-			&mut find_or_create_variable_declaration)
 			.map(|value| Box::new(value)))
 		.collect::<Result<foliage::Formulas, crate::Error>>()
 }