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//! Provides parsers for p-effects.
use crate::parsers::{
atomic_formula, parse_assign_op, parse_f_exp, parse_f_head, parse_function_term, parse_term,
ParseResult, Span,
};
use crate::parsers::{parens, prefix_expr};
use crate::types::PEffect;
use nom::branch::alt;
use nom::bytes::complete::tag;
use nom::character::complete::multispace1;
use nom::combinator::map;
use nom::sequence::{preceded, terminated, tuple};
/// Parses p-effects.
///
/// ## Example
/// ```
/// # use pddl::parsers::{parse_p_effect, preamble::*};
/// # use pddl::{AssignOp, AtomicFormula, EqualityAtomicFormula, FExp, FHead, FunctionSymbol, FunctionTerm, PEffect, Term};
/// assert!(parse_p_effect("(= x y)").is_value(
/// PEffect::AtomicFormula(AtomicFormula::Equality(
/// EqualityAtomicFormula::new(
/// Term::Name("x".into()),
/// Term::Name("y".into()))
/// )
/// )
/// ));
///
/// assert!(parse_p_effect("(not (= ?a B))").is_value(
/// PEffect::NotAtomicFormula(AtomicFormula::Equality(
/// EqualityAtomicFormula::new(
/// Term::Variable("a".into()),
/// Term::Name("B".into()))
/// )
/// )
/// ));
///
/// assert!(parse_p_effect("(assign fun-sym 1.23)").is_value(
/// PEffect::new_numeric_fluent(
/// AssignOp::Assign,
/// FHead::new(FunctionSymbol::from_str("fun-sym")),
/// FExp::new_number(1.23)
/// )
/// ));
///
/// assert!(parse_p_effect("(assign fun-sym 1.23)").is_value(
/// PEffect::new_numeric_fluent(
/// AssignOp::Assign,
/// FHead::new(FunctionSymbol::from_str("fun-sym")),
/// FExp::new_number(1.23)
/// )
/// ));
///
/// assert!(parse_p_effect("(assign (fun-sym) undefined)").is_value(
/// PEffect::new_object_fluent(
/// FunctionTerm::new(FunctionSymbol::from_str("fun-sym"), []),
/// None
/// )
/// ));
///
/// assert!(parse_p_effect("(assign (fun-sym) something)").is_value(
/// PEffect::new_object_fluent(
/// FunctionTerm::new(FunctionSymbol::from_str("fun-sym"), []),
/// Some(Term::Name("something".into()))
/// )
/// ));
/// ```
pub fn parse_p_effect<'a, T: Into<Span<'a>>>(input: T) -> ParseResult<'a, PEffect> {
let is = map(atomic_formula(parse_term), PEffect::new);
let is_not = map(prefix_expr("not", atomic_formula(parse_term)), |af| {
PEffect::new_not(af)
});
// :numeric-fluents
let numeric = map(
parens(tuple((
parse_assign_op,
preceded(multispace1, parse_f_head),
preceded(multispace1, parse_f_exp),
))),
|(op, head, exp)| PEffect::new_numeric_fluent(op, head, exp),
);
// :object-fluents
let object_undefined = map(
prefix_expr(
"assign",
terminated(parse_function_term, tuple((multispace1, tag("undefined")))),
),
|f_term| PEffect::new_object_fluent(f_term, None),
);
let object = map(
prefix_expr(
"assign",
tuple((parse_function_term, preceded(multispace1, parse_term))),
),
|(f_term, term)| PEffect::new_object_fluent(f_term, Some(term)),
);
alt((is_not, object_undefined, object, numeric, is))(input.into())
}
impl crate::parsers::Parser for PEffect {
type Item = PEffect;
/// See [`parse_p_effect`].
fn parse<'a, S: Into<Span<'a>>>(input: S) -> ParseResult<'a, Self::Item> {
parse_p_effect(input)
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::parsers::UnwrapValue;
use crate::{
AssignOp, AtomicFormula, EqualityAtomicFormula, FExp, FHead, FunctionSymbol, FunctionTerm,
Parser, Term,
};
#[test]
fn it_works() {
let input = "(can-move ?from-waypoint ?to-waypoint)";
let (_, _effect) = parse_p_effect(Span::new(input)).unwrap();
}
#[test]
fn not_works() {
let input = "(not (at B ?m))";
let mut is_not = map(prefix_expr("not", atomic_formula(parse_term)), |af| {
PEffect::new_not(af)
});
let result = is_not(input.into());
assert!(result.is_ok());
}
#[test]
fn test_parse() {
assert!(PEffect::parse("(= x y)").is_value(PEffect::AtomicFormula(
AtomicFormula::Equality(EqualityAtomicFormula::new(
Term::Name("x".into()),
Term::Name("y".into())
))
)));
assert!(
PEffect::parse("(not (= ?a B))").is_value(PEffect::NotAtomicFormula(
AtomicFormula::Equality(EqualityAtomicFormula::new(
Term::Variable("a".into()),
Term::Name("B".into())
))
))
);
assert!(
PEffect::parse("(assign fun-sym 1.23)").is_value(PEffect::new_numeric_fluent(
AssignOp::Assign,
FHead::new(FunctionSymbol::from_str("fun-sym")),
FExp::new_number(1.23)
))
);
assert!(
PEffect::parse("(assign fun-sym 1.23)").is_value(PEffect::new_numeric_fluent(
AssignOp::Assign,
FHead::new(FunctionSymbol::from_str("fun-sym")),
FExp::new_number(1.23)
))
);
assert!(PEffect::parse("(assign (fun-sym) undefined)").is_value(
PEffect::new_object_fluent(
FunctionTerm::new(FunctionSymbol::from_str("fun-sym"), []),
None
)
));
assert!(PEffect::parse("(assign (fun-sym) something)").is_value(
PEffect::new_object_fluent(
FunctionTerm::new(FunctionSymbol::from_str("fun-sym"), []),
Some(Term::Name("something".into()))
)
));
}
}