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//! Provides parsers for goal definitions.
use nom::branch::alt;
use nom::character::complete::multispace1;
use nom::combinator::map;
use nom::sequence::{preceded, tuple};
use crate::parsers::{parens, prefix_expr, space_separated_list0, typed_list, ParseResult, Span};
use crate::parsers::{parse_pref_gd, parse_variable};
use crate::types::PreconditionGoalDefinition;
use crate::PreconditionGoalDefinitions;
/// Parser for goal definitions.
///
/// ## Examples
/// ```
/// # use pddl::parsers::{parse_pre_gd, preamble::*};
/// # use pddl::{AtomicFormula, EqualityAtomicFormula, GoalDefinition, Literal, Preference, PreferenceName, PreferenceGD, PreconditionGoalDefinitions, PreconditionGoalDefinition, Term, Variable, Type, Typed, TypedList};
/// assert!(parse_pre_gd(Span::new("(= x y)")).is_value(
/// PreconditionGoalDefinitions::new_preference(
/// PreferenceGD::Goal(
/// GoalDefinition::AtomicFormula(
/// AtomicFormula::new_equality(
/// Term::Name("x".into()),
/// Term::Name("y".into())
/// )
/// )
/// )
/// )
/// ));
///
/// assert!(parse_pre_gd(Span::new("(and (= x y) (= a b))")).is_value(
/// PreconditionGoalDefinitions::from_iter([
/// PreconditionGoalDefinition::Preference(PreferenceGD::Goal(
/// GoalDefinition::AtomicFormula(
/// AtomicFormula::new_equality(
/// Term::Name("x".into()),
/// Term::Name("y".into())
/// )
/// )
/// )),
/// PreconditionGoalDefinition::Preference(PreferenceGD::Goal(
/// GoalDefinition::AtomicFormula(
/// AtomicFormula::new_equality(
/// Term::Name("a".into()),
/// Term::Name("b".into())
/// )
/// )
/// ))
/// ])
/// ));
///
/// assert!(parse_pre_gd(Span::new("(forall (?a ?b) (= a b))")).is_value(
/// PreconditionGoalDefinition::new_forall(
/// TypedList::from_iter([
/// Typed::new(Variable::from_str("a"), Type::OBJECT),
/// Typed::new(Variable::from_str("b"), Type::OBJECT),
/// ]),
/// PreconditionGoalDefinition::new_preference(PreferenceGD::Goal(
/// GoalDefinition::AtomicFormula(
/// AtomicFormula::new_equality(
/// Term::Name("a".into()),
/// Term::Name("b".into())
/// )
/// )
/// )).into()
/// ).into()
/// ));
/// ```
pub fn parse_pre_gd<'a, T: Into<Span<'a>>>(
input: T,
) -> ParseResult<'a, PreconditionGoalDefinitions> {
let pref_gd = map(parse_pref_gd, |x| {
PreconditionGoalDefinitions::from(PreconditionGoalDefinition::new_preference(x))
});
let and = map(
prefix_expr("and", space_separated_list0(parse_pre_gd)),
|x| PreconditionGoalDefinitions::from_iter(x.into_iter().flatten()),
);
// :universal-preconditions
let forall = map(
prefix_expr(
"forall",
tuple((
parens(typed_list(parse_variable)),
preceded(multispace1, parse_pre_gd),
)),
),
|(vars, gd)| {
PreconditionGoalDefinitions::from(PreconditionGoalDefinition::new_forall(vars, gd))
},
);
alt((forall, and, pref_gd))(input.into())
}
impl crate::parsers::Parser for PreconditionGoalDefinitions {
type Item = PreconditionGoalDefinitions;
/// See [`parse_pre_gd`].
fn parse<'a, S: Into<Span<'a>>>(input: S) -> ParseResult<'a, Self::Item> {
parse_pre_gd(input)
}
}
#[cfg(test)]
mod tests {
use crate::parsers::preamble::*;
use crate::{
AtomicFormula, GoalDefinition, PreconditionGoalDefinition, PreconditionGoalDefinitions,
PreferenceGD, Term, Type, Typed, TypedList, Variable,
};
#[test]
fn test_parse() {
assert!(
PreconditionGoalDefinitions::parse(Span::new("(= x y)")).is_value(
PreconditionGoalDefinitions::new_preference(PreferenceGD::Goal(
GoalDefinition::AtomicFormula(AtomicFormula::new_equality(
Term::Name("x".into()),
Term::Name("y".into())
))
))
)
);
assert!(
PreconditionGoalDefinitions::parse(Span::new("(and (= x y) (= a b))")).is_value(
PreconditionGoalDefinitions::from_iter([
PreconditionGoalDefinition::Preference(PreferenceGD::Goal(
GoalDefinition::AtomicFormula(AtomicFormula::new_equality(
Term::Name("x".into()),
Term::Name("y".into())
))
)),
PreconditionGoalDefinition::Preference(PreferenceGD::Goal(
GoalDefinition::AtomicFormula(AtomicFormula::new_equality(
Term::Name("a".into()),
Term::Name("b".into())
))
))
])
)
);
assert!(
PreconditionGoalDefinitions::parse(Span::new("(forall (?a ?b) (= a b))")).is_value(
PreconditionGoalDefinition::new_forall(
TypedList::from_iter([
Typed::new(Variable::from_str("a"), Type::OBJECT),
Typed::new(Variable::from_str("b"), Type::OBJECT),
]),
PreconditionGoalDefinition::new_preference(PreferenceGD::Goal(
GoalDefinition::AtomicFormula(AtomicFormula::new_equality(
Term::Name("a".into()),
Term::Name("b".into())
))
))
.into()
)
.into()
)
);
}
}