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//! Provides parsers for timed effects.
use crate::parsers::{parens, prefix_expr, ParseResult, Span};
use crate::parsers::{
parse_assign_op_t, parse_cond_effect, parse_f_assign_da, parse_f_exp_t, parse_f_head,
parse_time_specifier,
};
use crate::types::TimedEffect;
use nom::branch::alt;
use nom::character::complete::multispace1;
use nom::combinator::map;
use nom::sequence::{preceded, tuple};
/// Parses timed effects.
///
/// ## Example
/// ```
/// # use pddl::parsers::{parse_timed_effect, preamble::*};
/// # use pddl::{AssignOp, AssignOpT, AtomicFormula, CEffect, ConditionalEffect, EqualityAtomicFormula, FAssignDa, FExpDa, FExpT, FHead, PEffect, Term, TimedEffect, TimeSpecifier};
/// # use pddl::FExpDa::FExp;
/// assert!(parse_timed_effect("(at start (= x y))").is_value(
/// TimedEffect::new_conditional(
/// TimeSpecifier::Start,
/// ConditionalEffect::new(
/// PEffect::AtomicFormula(AtomicFormula::Equality(
/// EqualityAtomicFormula::new(
/// Term::Name("x".into()),
/// Term::Name("y".into()))
/// )
/// )
/// )
/// )
/// ));
///
/// assert!(parse_timed_effect("(at end (assign fun-sym ?duration))").is_value(
/// TimedEffect::new_fluent(
/// TimeSpecifier::End,
/// FAssignDa::new(
/// AssignOp::Assign,
/// FHead::Simple("fun-sym".into()),
/// FExpDa::Duration
/// )
/// )
/// ));
///
/// assert!(parse_timed_effect("(increase fun-sym #t)").is_value(
/// TimedEffect::new_continuous(
/// AssignOpT::Increase,
/// FHead::Simple("fun-sym".into()),
/// FExpT::Now
/// )
/// ));
/// ```
pub fn parse_timed_effect<'a, T: Into<Span<'a>>>(input: T) -> ParseResult<'a, TimedEffect> {
let cond = map(
prefix_expr(
"at",
tuple((
parse_time_specifier,
preceded(multispace1, parse_cond_effect),
)),
),
TimedEffect::from,
);
// :numeric-fluents
let fluent = map(
prefix_expr(
"at",
tuple((
parse_time_specifier,
preceded(multispace1, parse_f_assign_da),
)),
),
TimedEffect::from,
);
// :continuous-effects + :numeric-fluents
let continuous = map(
parens(tuple((
parse_assign_op_t,
preceded(multispace1, parse_f_head),
preceded(multispace1, parse_f_exp_t),
))),
TimedEffect::from,
);
alt((fluent, cond, continuous))(input.into())
}
impl crate::parsers::Parser for TimedEffect {
type Item = TimedEffect;
/// See [`parse_timed_effect`].
fn parse<'a, S: Into<Span<'a>>>(input: S) -> ParseResult<'a, Self::Item> {
parse_timed_effect(input)
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::parsers::UnwrapValue;
use crate::{
AssignOp, AssignOpT, AtomicFormula, ConditionalEffect, EqualityAtomicFormula, FAssignDa,
FExpDa, FExpT, FHead, PEffect, Parser, Term, TimeSpecifier,
};
#[test]
fn it_works() {
let input = "(at end (increase (distance-travelled) 5))";
let (_, _effect) = parse_timed_effect(Span::new(input)).unwrap();
}
#[test]
fn test_parse() {
assert!(
TimedEffect::parse("(at start (= x y))").is_value(TimedEffect::new_conditional(
TimeSpecifier::Start,
ConditionalEffect::new(PEffect::AtomicFormula(AtomicFormula::Equality(
EqualityAtomicFormula::new(Term::Name("x".into()), Term::Name("y".into()))
)))
))
);
assert!(
TimedEffect::parse("(at end (assign fun-sym ?duration))").is_value(
TimedEffect::new_fluent(
TimeSpecifier::End,
FAssignDa::new(
AssignOp::Assign,
FHead::Simple("fun-sym".into()),
FExpDa::Duration
)
)
)
);
assert!(
TimedEffect::parse("(increase fun-sym #t)").is_value(TimedEffect::new_continuous(
AssignOpT::Increase,
FHead::Simple("fun-sym".into()),
FExpT::Now
))
);
}
}