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//! Provides parsers for timeless definitions.
use crate::parsers::{literal, parse_name, prefix_expr, space_separated_list1, ParseResult, Span};
use crate::types::Timeless;
use nom::combinator::map;
/// Parser for timeless definitions.
/// This is a PDDL 1.2 construct.
///
/// ## Example
/// ```
/// # use pddl::parsers::{parse_timeless_def, preamble::*};
/// # use pddl::{AtomicFormula, EqualityAtomicFormula, Literal, Name, Objects, Timeless, ToTyped, Type};
/// let input = "(:timeless (= x y) (= a b))";
/// assert!(parse_timeless_def(input).is_value(
/// Timeless::from_iter([
/// Literal::AtomicFormula(
/// AtomicFormula::Equality(
/// EqualityAtomicFormula::new(
/// "x".into(),
/// "y".into()
/// )
/// )
/// ),
/// Literal::AtomicFormula(
/// // ...
/// # AtomicFormula::Equality(
/// # EqualityAtomicFormula::new(
/// # "a".into(),
/// # "b".into()
/// # )
/// # )
/// )
/// ])
/// ));
/// ```
pub fn parse_timeless_def<'a, T: Into<Span<'a>>>(input: T) -> ParseResult<'a, Timeless> {
map(
prefix_expr(":timeless", space_separated_list1(literal(parse_name))),
Timeless::from_iter,
)(input.into())
}
impl crate::parsers::Parser for Timeless {
type Item = Timeless;
/// See [`parse_timeless_def`].
fn parse<'a, S: Into<Span<'a>>>(input: S) -> ParseResult<'a, Self::Item> {
parse_timeless_def(input)
}
}
#[cfg(test)]
mod tests {
use crate::parsers::preamble::*;
use crate::{AtomicFormula, EqualityAtomicFormula, Literal, Timeless};
#[test]
fn test_parse() {
let input = "(:timeless (= x y) (= a b))";
assert!(Timeless::parse(input).is_value(Timeless::from_iter([
Literal::AtomicFormula(AtomicFormula::Equality(EqualityAtomicFormula::new(
"x".into(),
"y".into()
))),
Literal::AtomicFormula(AtomicFormula::Equality(EqualityAtomicFormula::new(
"a".into(),
"b".into()
)))
])));
}
}