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//! Provides parsers for duration constraints.
use nom::branch::alt;
use nom::bytes::complete::tag;
use nom::combinator::map;
use crate::parsers::{parse_simple_duration_constraint, ParseResult, Span};
use crate::parsers::{prefix_expr, space_separated_list1};
use crate::types::DurationConstraint;
/// Parses a duration constraint.
///
/// ## Example
/// ```
/// # use pddl::parsers::{parse_duration_constraint, preamble::*};
/// # use pddl::{DOp, DurationConstraint, DurationValue, FunctionType, SimpleDurationConstraint, TimeSpecifier};
/// let input = "()";
/// assert!(parse_duration_constraint(input).is_value(None));
///
/// let input = "(= ?duration 5)";
/// assert!(parse_duration_constraint(input).is_value(
/// Some(DurationConstraint::new(
/// SimpleDurationConstraint::Op(
/// DOp::Equal,
/// DurationValue::Number(5.into())
/// )
/// ))
/// ));
///
/// let input = "(at end (<= ?duration 1.23))";
/// assert!(parse_duration_constraint(input).is_value(
/// Some(DurationConstraint::new(
/// SimpleDurationConstraint::new_at(
/// TimeSpecifier::End,
/// SimpleDurationConstraint::Op(
/// DOp::LessThanOrEqual,
/// DurationValue::Number(1.23.into())
/// )
/// )
/// ))
/// ));
///
/// let input = "(and (at end (<= ?duration 1.23)) (>= ?duration 1.0))";
/// assert!(parse_duration_constraint(input).is_value(
/// Some(DurationConstraint::new_all([
/// SimpleDurationConstraint::new_at(
/// TimeSpecifier::End,
/// SimpleDurationConstraint::Op(
/// DOp::LessThanOrEqual,
/// DurationValue::Number(1.23.into())
/// )
/// ),
/// SimpleDurationConstraint::new_op(
/// DOp::GreaterOrEqual,
/// DurationValue::Number(1.0.into())
/// )
/// ]))
/// ));
///```
pub fn parse_duration_constraint<'a, T: Into<Span<'a>>>(
input: T,
) -> ParseResult<'a, Option<DurationConstraint>> {
let none = map(tag("()"), |_| None);
let simple = map(parse_simple_duration_constraint, |c| {
Some(DurationConstraint::from(c))
});
// : duration-inequalities
let and = map(
prefix_expr(
"and",
space_separated_list1(parse_simple_duration_constraint),
),
|cs| Some(DurationConstraint::from_iter(cs)),
);
alt((none, simple, and))(input.into())
}
impl crate::parsers::Parser for DurationConstraint {
type Item = Option<DurationConstraint>;
/// See [`parse_duration_constraint`].
fn parse<'a, S: Into<Span<'a>>>(input: S) -> ParseResult<'a, Self::Item> {
parse_duration_constraint(input)
}
}
#[cfg(test)]
mod tests {
use crate::parsers::UnwrapValue;
use crate::{
DOp, DurationConstraint, DurationValue, Parser, SimpleDurationConstraint, TimeSpecifier,
};
#[test]
fn test_parse() {
let input = "()";
assert!(DurationConstraint::parse(input).is_value(None));
let input = "(= ?duration 5)";
assert!(
DurationConstraint::parse(input).is_value(Some(DurationConstraint::new(
SimpleDurationConstraint::Op(DOp::Equal, DurationValue::Number(5.into()))
)))
);
let input = "(at end (<= ?duration 1.23))";
assert!(
DurationConstraint::parse(input).is_value(Some(DurationConstraint::new(
SimpleDurationConstraint::new_at(
TimeSpecifier::End,
SimpleDurationConstraint::Op(
DOp::LessThanOrEqual,
DurationValue::Number(1.23.into())
)
)
)))
);
let input = "(and (at end (<= ?duration 1.23)) (>= ?duration 1.0))";
assert!(
DurationConstraint::parse(input).is_value(Some(DurationConstraint::new_all([
SimpleDurationConstraint::new_at(
TimeSpecifier::End,
SimpleDurationConstraint::Op(
DOp::LessThanOrEqual,
DurationValue::Number(1.23.into())
)
),
SimpleDurationConstraint::new_op(
DOp::GreaterOrEqual,
DurationValue::Number(1.0.into())
)
])))
);
}
}