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//! Provides parsers for effects.
use nom::branch::alt;
use nom::combinator::map;
use crate::parsers::{parse_c_effect, ParseResult, Span};
use crate::parsers::{prefix_expr, space_separated_list0};
use crate::types::Effects;
/// Parser for effects.
///
/// ## Example
/// ```
/// # use pddl::parsers::{parse_effect, preamble::*};
/// # use pddl::{AtomicFormula, CEffect, Effects, EqualityAtomicFormula, PEffect, Term};
/// assert!(parse_effect("(= x y)").is_value(
/// Effects::new(
/// CEffect::Effect(
/// PEffect::AtomicFormula(AtomicFormula::Equality(
/// EqualityAtomicFormula::new(
/// Term::Name("x".into()),
/// Term::Name("y".into()))
/// )
/// )
/// )
/// )
/// ));
/// assert!(parse_effect("(and (= x y) (not (= ?a B)))").is_value(
/// Effects::from_iter([
/// CEffect::Effect(
/// PEffect::AtomicFormula(AtomicFormula::Equality(
/// EqualityAtomicFormula::new(
/// Term::Name("x".into()),
/// Term::Name("y".into()))
/// )
/// )
/// ),
/// CEffect::Effect(
/// PEffect::NotAtomicFormula(AtomicFormula::Equality(
/// EqualityAtomicFormula::new(
/// Term::Variable("a".into()),
/// Term::Name("B".into()))
/// )
/// )
/// )
/// ])
/// ));
/// ```
pub fn parse_effect<'a, T: Into<Span<'a>>>(input: T) -> ParseResult<'a, Effects> {
let exactly = map(parse_c_effect, Effects::from);
let all = map(
prefix_expr("and", space_separated_list0(parse_c_effect)),
Effects::from,
);
alt((all, exactly))(input.into())
}
impl crate::parsers::Parser for Effects {
type Item = Effects;
/// See [`parse_effect`].
fn parse<'a, S: Into<Span<'a>>>(input: S) -> ParseResult<'a, Self::Item> {
parse_effect(input)
}
}
#[cfg(test)]
mod tests {
use crate::parsers::UnwrapValue;
use crate::{AtomicFormula, CEffect, Effects, EqualityAtomicFormula, PEffect, Parser, Term};
#[test]
fn test_parse() {
assert!(
Effects::parse("(= x y)").is_value(Effects::new(CEffect::Effect(
PEffect::AtomicFormula(AtomicFormula::Equality(EqualityAtomicFormula::new(
Term::Name("x".into()),
Term::Name("y".into())
)))
)))
);
assert!(
Effects::parse("(and (= x y) (not (= ?a B)))").is_value(Effects::from_iter([
CEffect::Effect(PEffect::AtomicFormula(AtomicFormula::Equality(
EqualityAtomicFormula::new(Term::Name("x".into()), Term::Name("y".into()))
))),
CEffect::Effect(PEffect::NotAtomicFormula(AtomicFormula::Equality(
EqualityAtomicFormula::new(Term::Variable("a".into()), Term::Name("B".into()))
)))
]))
);
}
}