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//! Provides parsers for effect conditions.
use nom::branch::alt;
use nom::combinator::map;
use nom::Parser;
use crate::parsers::{parse_p_effect, ParseResult, Span};
use crate::parsers::{prefix_expr, space_separated_list0};
use crate::types::EffectCondition;
/// Parses effect conditions.
///
/// ## Example
/// ```
/// # use pddl::parsers::{parse_effect_condition, preamble::*};
/// # use pddl::{AtomicFormula, EffectCondition, EqualityAtomicFormula, PrimitiveEffect, Term};
/// assert!(parse_effect_condition("(= x y)").is_value(
/// EffectCondition::Single(
/// PrimitiveEffect::AtomicFormula(AtomicFormula::Equality(
/// EqualityAtomicFormula::new(
/// Term::Name("x".into()),
/// Term::Name("y".into()))
/// )
/// )
/// )
/// ));
///
/// assert!(parse_effect_condition("(and (= x y) (not (= ?a B)))").is_value(
/// EffectCondition::All(vec![
/// PrimitiveEffect::AtomicFormula(AtomicFormula::Equality(
/// EqualityAtomicFormula::new(
/// Term::Name("x".into()),
/// Term::Name("y".into()))
/// )
/// ),
/// PrimitiveEffect::NotAtomicFormula(AtomicFormula::Equality(
/// EqualityAtomicFormula::new(
/// Term::Variable("a".into()),
/// Term::Name("B".into()))
/// )
/// )
/// ])
/// ));
/// ```
#[allow(deprecated)]
pub fn parse_effect_condition<'a, T: Into<Span<'a>>>(input: T) -> ParseResult<'a, EffectCondition> {
let exactly = map(parse_p_effect, EffectCondition::from);
let all = map(
prefix_expr("and", space_separated_list0(parse_p_effect)),
EffectCondition::from,
);
alt((all, exactly)).parse(input.into())
}
/// Alias for [`parse_effect_condition`].
#[deprecated(since = "0.2.0", note = "Use `parse_effect_condition` instead")]
pub fn parse_cond_effect<'a, T: Into<Span<'a>>>(input: T) -> ParseResult<'a, EffectCondition> {
parse_effect_condition(input)
}
impl crate::parsers::Parser for EffectCondition {
type Item = EffectCondition;
/// See [`parse_effect_condition`].
fn parse<'a, S: Into<Span<'a>>>(input: S) -> ParseResult<'a, Self::Item> {
parse_effect_condition(input)
}
}
#[cfg(test)]
mod tests {
use crate::parsers::UnwrapValue;
use crate::{
AtomicFormula, EffectCondition, EqualityAtomicFormula, Parser, PrimitiveEffect, Term,
};
#[test]
fn test_parse() {
assert!(
EffectCondition::parse("(= x y)").is_value(EffectCondition::Single(
PrimitiveEffect::AtomicFormula(AtomicFormula::Equality(
EqualityAtomicFormula::new(Term::Name("x".into()), Term::Name("y".into()))
))
))
);
assert!(
EffectCondition::parse("(and (= x y) (not (= ?a B)))").is_value(EffectCondition::All(
vec![
PrimitiveEffect::AtomicFormula(AtomicFormula::Equality(
EqualityAtomicFormula::new(Term::Name("x".into()), Term::Name("y".into()))
)),
PrimitiveEffect::NotAtomicFormula(AtomicFormula::Equality(
EqualityAtomicFormula::new(
Term::Variable("a".into()),
Term::Name("B".into())
)
))
]
))
);
}
#[test]
fn test_parse_empty_and() {
assert!(EffectCondition::parse("(and)").is_value(EffectCondition::All(vec![])));
}
}