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//! Provides parsers for (preferred) timed goal definitions.
use nom::branch::alt;
use nom::character::complete::multispace1;
use nom::combinator::{map, opt};
use nom::sequence::terminated;
use nom::Parser;
use crate::parsers::{parse_pref_name, parse_timed_gd};
use crate::parsers::{prefix_expr, ParseResult, Span};
use crate::types::PreferenceTimedGoalDefinition;
/// Parser for (preferred) timed goal definitions.
///
/// ## Examples
/// ```
/// # use pddl::parsers::{parse_pref_timed_gd, preamble::*};
/// # use pddl::{AtomicFormula, GoalDefinition, Interval, PreferenceTimedGoalDefinition, Term, TimedGoalDefinition, TimeSpecifier};
/// assert!(parse_pref_timed_gd("(at start (= x y))").is_value(
/// PreferenceTimedGoalDefinition::Required(
/// TimedGoalDefinition::at(
/// TimeSpecifier::Start,
/// GoalDefinition::AtomicFormula(
/// AtomicFormula::new_equality(
/// Term::Name("x".into()),
/// Term::Name("y".into())
/// )
/// )
/// )
/// )
/// ));
///
///
/// assert!(parse_pref_timed_gd("(preference (over all (= x y)))").is_value(
/// PreferenceTimedGoalDefinition::Preference(
/// None,
/// TimedGoalDefinition::over(
/// Interval::All,
/// GoalDefinition::AtomicFormula(
/// AtomicFormula::new_equality(
/// Term::Name("x".into()),
/// Term::Name("y".into())
/// )
/// )
/// )
/// )
/// ));
///
/// assert!(parse_pref_timed_gd("(preference pref-name (over all (= x y)))").is_value(
/// PreferenceTimedGoalDefinition::Preference(
/// Some("pref-name".into()),
/// TimedGoalDefinition::over(
/// Interval::All,
/// GoalDefinition::AtomicFormula(
/// AtomicFormula::new_equality(
/// Term::Name("x".into()),
/// Term::Name("y".into())
/// )
/// )
/// )
/// )
/// ));
/// ```
pub fn parse_pref_timed_gd<'a, T: Into<Span<'a>>>(
input: T,
) -> ParseResult<'a, PreferenceTimedGoalDefinition> {
let required = map(parse_timed_gd, PreferenceTimedGoalDefinition::from);
// :preferences
let preference = map(
prefix_expr(
"preference",
(
opt(terminated(parse_pref_name, multispace1)),
parse_timed_gd,
),
),
PreferenceTimedGoalDefinition::from,
);
alt((preference, required)).parse(input.into())
}
impl crate::parsers::Parser for PreferenceTimedGoalDefinition {
type Item = PreferenceTimedGoalDefinition;
/// See [`parse_pref_timed_gd`].
fn parse<'a, S: Into<Span<'a>>>(input: S) -> ParseResult<'a, Self::Item> {
parse_pref_timed_gd(input)
}
}
#[cfg(test)]
mod tests {
use crate::parsers::preamble::*;
use crate::{
AtomicFormula, GoalDefinition, Interval, PreferenceTimedGoalDefinition, Term,
TimeSpecifier, TimedGoalDefinition,
};
#[test]
fn test_parse() {
assert!(
PreferenceTimedGoalDefinition::parse("(at start (= x y))").is_value(
PreferenceTimedGoalDefinition::Required(TimedGoalDefinition::at(
TimeSpecifier::Start,
GoalDefinition::AtomicFormula(AtomicFormula::new_equality(
Term::Name("x".into()),
Term::Name("y".into())
))
))
)
);
assert!(
PreferenceTimedGoalDefinition::parse("(preference (over all (= x y)))").is_value(
PreferenceTimedGoalDefinition::Preference(
None,
TimedGoalDefinition::over(
Interval::All,
GoalDefinition::AtomicFormula(AtomicFormula::new_equality(
Term::Name("x".into()),
Term::Name("y".into())
))
)
)
)
);
assert!(
PreferenceTimedGoalDefinition::parse("(preference pref-name (over all (= x y)))")
.is_value(PreferenceTimedGoalDefinition::Preference(
Some("pref-name".into()),
TimedGoalDefinition::over(
Interval::All,
GoalDefinition::AtomicFormula(AtomicFormula::new_equality(
Term::Name("x".into()),
Term::Name("y".into())
))
)
))
);
}
}