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//! Provides parsers for goal initial state definitions.
use nom::combinator::map;
use crate::parsers::{parse_init_el, prefix_expr, space_separated_list0, ParseResult, Span};
use crate::types::InitElements;
/// Parser for goal initial state definitions.
///
/// ## Example
/// ```
/// # use pddl::parsers::{parse_problem_init_def, preamble::*};
/// # use pddl::{AtomicFormula, InitElement, InitElements, NameLiteral, Number};
/// let input = "(:init (train-not-in-use train1) (at 10 (train-not-in-use train2)))";
/// assert!(parse_problem_init_def(input).is_value(
/// InitElements::from_iter([
/// InitElement::new_literal(
/// NameLiteral::new(
/// AtomicFormula::new_predicate(
/// "train-not-in-use".into(),
/// ["train1".into()]
/// )
/// )
/// ),
/// InitElement::new_at(
/// Number::from(10),
/// NameLiteral::new(
/// AtomicFormula::new_predicate(
/// "train-not-in-use".into(),
/// ["train2".into()]
/// )
/// )
/// )
/// ])
/// ));
/// ```
pub fn parse_problem_init_def<'a, T: Into<Span<'a>>>(input: T) -> ParseResult<'a, InitElements> {
map(
prefix_expr(":init", space_separated_list0(parse_init_el)),
InitElements::new,
)(input.into())
}
impl crate::parsers::Parser for InitElements {
type Item = InitElements;
/// See [`parse_problem_init_def`].
fn parse<'a, S: Into<Span<'a>>>(input: S) -> ParseResult<'a, Self::Item> {
parse_problem_init_def(input)
}
}
#[cfg(test)]
mod tests {
use crate::parsers::UnwrapValue;
use crate::{AtomicFormula, InitElement, InitElements, NameLiteral, Number, Parser};
#[test]
fn test_parse() {
let input = "(:init (train-not-in-use train1) (at 10 (train-not-in-use train2)))";
assert!(
InitElements::parse(input).is_value(InitElements::from_iter([
InitElement::new_literal(NameLiteral::new(AtomicFormula::new_predicate(
"train-not-in-use".into(),
["train1".into()]
))),
InitElement::new_at(
Number::from(10),
NameLiteral::new(AtomicFormula::new_predicate(
"train-not-in-use".into(),
["train2".into()]
))
)
]))
);
}
}