anthem-rs/src/translate/common.rs

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pub(crate) trait FindOrCreateFunctionDeclaration = FnMut(&str, usize)
-> std::rc::Rc<foliage::FunctionDeclaration>;
pub(crate) trait FindOrCreatePredicateDeclaration = FnMut(&str, usize)
-> std::rc::Rc<foliage::PredicateDeclaration>;
pub(crate) trait FindOrCreateVariableDeclaration = FnMut(&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,
name: &str, arity: usize)
-> std::rc::Rc<foliage::FunctionDeclaration>
{
match function_declarations.iter()
.find(|x| x.name == name && x.arity == arity)
{
Some(value) => std::rc::Rc::clone(value),
None =>
{
let declaration = foliage::FunctionDeclaration
{
name: name.to_owned(),
arity,
};
let declaration = std::rc::Rc::new(declaration);
function_declarations.insert(std::rc::Rc::clone(&declaration));
log::debug!("new function declaration: {}/{}", name, arity);
declaration
},
}
}
pub(crate) fn translate_comparison_operator(comparison_operator: clingo::ast::ComparisonOperator)
-> foliage::ComparisonOperator
{
match comparison_operator
{
clingo::ast::ComparisonOperator::GreaterThan
=> foliage::ComparisonOperator::Greater,
clingo::ast::ComparisonOperator::LessThan
=> foliage::ComparisonOperator::Less,
clingo::ast::ComparisonOperator::LessEqual
=> foliage::ComparisonOperator::LessOrEqual,
clingo::ast::ComparisonOperator::GreaterEqual
=> foliage::ComparisonOperator::GreaterOrEqual,
clingo::ast::ComparisonOperator::NotEqual
=> foliage::ComparisonOperator::NotEqual,
clingo::ast::ComparisonOperator::Equal
=> foliage::ComparisonOperator::Equal,
}
}
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pub(crate) fn choose_value_in_primitive(term: Box<foliage::Term>,
variable_declaration: &std::rc::Rc<foliage::VariableDeclaration>)
-> foliage::Comparison
{
let variable = foliage::Variable
{
declaration: std::rc::Rc::clone(variable_declaration),
};
foliage::Comparison
{
operator: foliage::ComparisonOperator::Equal,
left: Box::new(foliage::Term::Variable(variable)),
right: term,
}
}
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pub(crate) fn choose_value_in_term<F1, F2>(term: &clingo::ast::Term,
variable_declaration: &std::rc::Rc<foliage::VariableDeclaration>,
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mut find_or_create_function_declaration: F1, mut find_or_create_variable_declaration: F2)
-> Result<foliage::Formula, crate::Error>
where
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F1: FindOrCreateFunctionDeclaration,
F2: FindOrCreateVariableDeclaration,
{
match term.term_type()
{
clingo::ast::TermType::Symbol(symbol) => match symbol.symbol_type()
.map_err(|error| crate::Error::new_logic("clingo error").with(error))?
{
clingo::SymbolType::Number => Ok(foliage::Formula::Comparison(choose_value_in_primitive(
Box::new(foliage::Term::Integer(symbol.number()
.map_err(|error| crate::Error::new_logic("clingo error").with(error))?)),
variable_declaration))),
clingo::SymbolType::Infimum => Ok(foliage::Formula::Comparison(choose_value_in_primitive(
Box::new(foliage::Term::SpecialInteger(foliage::SpecialInteger::Infimum)),
variable_declaration))),
clingo::SymbolType::Supremum => Ok(foliage::Formula::Comparison(choose_value_in_primitive(
Box::new(foliage::Term::SpecialInteger(foliage::SpecialInteger::Supremum)),
variable_declaration))),
clingo::SymbolType::String => Ok(foliage::Formula::Comparison(choose_value_in_primitive(
Box::new(foliage::Term::String(symbol.string()
.map_err(|error| crate::Error::new_logic("clingo error").with(error))?
.to_string())),
variable_declaration))),
clingo::SymbolType::Function =>
{
let arguments = symbol.arguments()
.map_err(|error| crate::Error::new_logic("clingo error").with(error))?;
// Functions with arguments are represented as clingo::ast::Function by the parser.
// At this point, we only have to handle (0-ary) constants
if !arguments.is_empty()
{
return Err(crate::Error::new_logic("unexpected arguments, expected (0-ary) constant symbol"));
}
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 function = foliage::Term::Function(foliage::Function
{
declaration: constant_declaration,
arguments: vec![],
});
Ok(foliage::Formula::Comparison(choose_value_in_primitive(Box::new(function), variable_declaration)))
}
},
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clingo::ast::TermType::Variable(variable) =>
Err(crate::Error::new_not_yet_implemented("todo")),
_ => Err(crate::Error::new_not_yet_implemented("todo")),
}
}