160 lines
5.4 KiB
Rust
160 lines
5.4 KiB
Rust
pub(crate) fn translate_body_term<C>(body_term: &clingo::ast::Term, sign: clingo::ast::Sign,
|
|
context: &C)
|
|
-> Result<foliage::Formula, crate::Error>
|
|
where
|
|
C: crate::translate::common::GetOrCreateVariableDeclaration
|
|
+ crate::translate::common::GetOrCreateFunctionDeclaration
|
|
+ crate::translate::common::GetOrCreatePredicateDeclaration
|
|
+ crate::translate::common::AssignVariableDeclarationDomain
|
|
{
|
|
let function = match body_term.term_type()
|
|
{
|
|
clingo::ast::TermType::Function(value) => value,
|
|
_ => return Err(crate::Error::new_unsupported_language_feature("only functions supported as body terms")),
|
|
};
|
|
|
|
let function_name = function.name().map_err(|error| crate::Error::new_decode_identifier(error))?;
|
|
|
|
let predicate_declaration = context.get_or_create_predicate_declaration(function_name,
|
|
function.arguments().len());
|
|
|
|
let parameters = function.arguments().iter().map(|_|
|
|
{
|
|
let variable_declaration = std::rc::Rc::new(
|
|
foliage::VariableDeclaration::new("<anonymous>".to_string()));
|
|
context.assign_variable_declaration_domain(&variable_declaration,
|
|
crate::translate::common::Domain::Program);
|
|
variable_declaration
|
|
})
|
|
.collect::<foliage::VariableDeclarations>();
|
|
let parameters = std::rc::Rc::new(parameters);
|
|
|
|
let predicate_arguments = parameters.iter().map(
|
|
|parameter| Box::new(foliage::Term::variable(parameter)))
|
|
.collect::<Vec<_>>();
|
|
|
|
let predicate = foliage::Formula::predicate(&predicate_declaration, predicate_arguments);
|
|
|
|
let predicate_literal = match sign
|
|
{
|
|
clingo::ast::Sign::None
|
|
| clingo::ast::Sign::DoubleNegation
|
|
=> predicate,
|
|
clingo::ast::Sign::Negation
|
|
=> foliage::Formula::not(Box::new(predicate)),
|
|
};
|
|
|
|
if function.arguments().is_empty()
|
|
{
|
|
return Ok(predicate_literal);
|
|
}
|
|
|
|
assert_eq!(function.arguments().len(), parameters.len());
|
|
|
|
let mut parameters_iterator = parameters.iter();
|
|
let mut arguments = function.arguments().iter().map(
|
|
|x| crate::translate::common::choose_value_in_term(x, ¶meters_iterator.next().unwrap(),
|
|
context)
|
|
.map(|x| Box::new(x)))
|
|
.collect::<Result<Vec<_>, _>>()?;
|
|
|
|
arguments.push(Box::new(predicate_literal));
|
|
|
|
let and = foliage::Formula::and(arguments);
|
|
|
|
Ok(foliage::Formula::exists(parameters, Box::new(and)))
|
|
}
|
|
|
|
pub(crate) fn translate_body_literal<C>(body_literal: &clingo::ast::BodyLiteral,
|
|
context: &C)
|
|
-> Result<foliage::Formula, crate::Error>
|
|
where
|
|
C: crate::translate::common::GetOrCreateVariableDeclaration
|
|
+ crate::translate::common::GetOrCreateFunctionDeclaration
|
|
+ crate::translate::common::GetOrCreatePredicateDeclaration
|
|
+ crate::translate::common::AssignVariableDeclarationDomain
|
|
{
|
|
match body_literal.sign()
|
|
{
|
|
clingo::ast::Sign::None => (),
|
|
_ => return Err(crate::Error::new_unsupported_language_feature(
|
|
"signed body literals")),
|
|
}
|
|
|
|
let literal = match body_literal.body_literal_type()
|
|
{
|
|
clingo::ast::BodyLiteralType::Literal(literal) => literal,
|
|
_ => return Err(crate::Error::new_unsupported_language_feature(
|
|
"only plain body literals supported")),
|
|
};
|
|
|
|
match literal.literal_type()
|
|
{
|
|
clingo::ast::LiteralType::Boolean(value) =>
|
|
{
|
|
match literal.sign()
|
|
{
|
|
clingo::ast::Sign::None => (),
|
|
_ => return Err(crate::Error::new_logic("unexpected negated Boolean value")),
|
|
}
|
|
|
|
Ok(foliage::Formula::Boolean(value))
|
|
},
|
|
clingo::ast::LiteralType::Symbolic(term) => translate_body_term(term, literal.sign(),
|
|
context),
|
|
clingo::ast::LiteralType::Comparison(comparison) =>
|
|
{
|
|
let parameters = (0..2).map(|_|
|
|
{
|
|
let variable_declaration = std::rc::Rc::new(
|
|
foliage::VariableDeclaration::new("<anonymous>".to_string()));
|
|
context.assign_variable_declaration_domain(&variable_declaration,
|
|
crate::translate::common::Domain::Program);
|
|
variable_declaration
|
|
})
|
|
.collect::<foliage::VariableDeclarations>();
|
|
let parameters = std::rc::Rc::new(parameters);
|
|
|
|
let mut parameters_iterator = parameters.iter();
|
|
let parameter_z1 = ¶meters_iterator.next().unwrap();
|
|
let parameter_z2 = ¶meters_iterator.next().unwrap();
|
|
|
|
let choose_z1_in_t1 = crate::translate::common::choose_value_in_term(comparison.left(),
|
|
parameter_z1, context)?;
|
|
let choose_z2_in_t2 = crate::translate::common::choose_value_in_term(comparison.right(),
|
|
parameter_z2, context)?;
|
|
|
|
let variable_1 = foliage::Term::variable(parameter_z1);
|
|
let variable_2 = foliage::Term::variable(parameter_z2);
|
|
|
|
let operator = crate::translate::common::translate_comparison_operator(
|
|
comparison.comparison_type());
|
|
|
|
let compare_z1_and_z2 = foliage::Formula::compare(operator, Box::new(variable_1),
|
|
Box::new(variable_2));
|
|
|
|
let and = foliage::Formula::and(vec![Box::new(choose_z1_in_t1),
|
|
Box::new(choose_z2_in_t2), Box::new(compare_z1_and_z2)]);
|
|
|
|
Ok(foliage::Formula::exists(parameters, Box::new(and)))
|
|
},
|
|
_ => Err(crate::Error::new_unsupported_language_feature(
|
|
"body literals other than Booleans, terms, or comparisons")),
|
|
}
|
|
}
|
|
|
|
pub(crate) fn translate_body<C>(body_literals: &[clingo::ast::BodyLiteral],
|
|
context: &C)
|
|
-> Result<foliage::Formulas, crate::Error>
|
|
where
|
|
C: crate::translate::common::GetOrCreateVariableDeclaration
|
|
+ crate::translate::common::GetOrCreateFunctionDeclaration
|
|
+ crate::translate::common::GetOrCreatePredicateDeclaration
|
|
+ crate::translate::common::AssignVariableDeclarationDomain
|
|
{
|
|
body_literals.iter()
|
|
.map(|body_literal| translate_body_literal(body_literal, context)
|
|
.map(|value| Box::new(value)))
|
|
.collect::<Result<foliage::Formulas, crate::Error>>()
|
|
}
|