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//! Provides parsers for simple duration constraints.
use nom::branch::alt;
use nom::bytes::complete::tag;
use nom::character::complete::multispace1;
use nom::combinator::map;
use nom::sequence::{preceded, tuple};
use crate::parsers::{parens, prefix_expr, ParseResult, Span};
use crate::parsers::{parse_d_op, parse_d_value, parse_time_specifier};
use crate::types::SimpleDurationConstraint;
/// Parses a simple duration constraint.
///
/// ## Example
/// ```
/// # use pddl::parsers::{parse_simple_duration_constraint, preamble::*};
/// # use pddl::{DOp, DurationValue, FunctionType, SimpleDurationConstraint, TimeSpecifier};
/// let input = "(>= ?duration 1.23)";
/// assert!(parse_simple_duration_constraint(input).is_value(
/// SimpleDurationConstraint::new_op(
/// DOp::GreaterOrEqual,
/// DurationValue::new_number(1.23)
/// )
/// ));
///
/// let input = "(at end (<= ?duration 1.23))";
/// assert!(parse_simple_duration_constraint(input).is_value(
/// SimpleDurationConstraint::new_at(
/// TimeSpecifier::End,
/// SimpleDurationConstraint::Op(
/// DOp::LessThanOrEqual,
/// DurationValue::new_number(1.23)
/// )
/// )
/// ));
///```
pub fn parse_simple_duration_constraint<'a, T: Into<Span<'a>>>(
input: T,
) -> ParseResult<'a, SimpleDurationConstraint> {
let op = map(
parens(tuple((
parse_d_op,
preceded(
tuple((multispace1, tag("?duration"), multispace1)),
parse_d_value,
),
))),
SimpleDurationConstraint::from,
);
let at = map(
prefix_expr(
"at",
tuple((
parse_time_specifier,
preceded(multispace1, parse_simple_duration_constraint),
)),
),
SimpleDurationConstraint::from,
);
alt((op, at))(input.into())
}
impl crate::parsers::Parser for SimpleDurationConstraint {
type Item = SimpleDurationConstraint;
/// See [`parse_simple_duration_constraint`].
fn parse<'a, S: Into<Span<'a>>>(input: S) -> ParseResult<'a, Self::Item> {
parse_simple_duration_constraint(input)
}
}
#[cfg(test)]
mod tests {
use crate::parsers::preamble::*;
use crate::{DOp, DurationValue, SimpleDurationConstraint, TimeSpecifier};
#[test]
fn test_parse() {
let input = "(>= ?duration 1.23)";
assert!(
SimpleDurationConstraint::parse(input).is_value(SimpleDurationConstraint::new_op(
DOp::GreaterOrEqual,
DurationValue::new_number(1.23)
))
);
let input = "(at end (<= ?duration 1.23))";
assert!(
SimpleDurationConstraint::parse(input).is_value(SimpleDurationConstraint::new_at(
TimeSpecifier::End,
SimpleDurationConstraint::Op(DOp::LessThanOrEqual, DurationValue::new_number(1.23))
))
);
}
}