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//! Provides parsers for durative operations.
use nom::branch::alt;
use nom::bytes::complete::tag;
use nom::combinator::map;
use nom::Parser;
use crate::parsers::{ParseResult, Span};
use crate::types::{d_op::names, DurationOperator};
/// Parses a durative operation, i.e. `<= | >= | =`.
///
/// ## Example
/// ```
/// # use pddl::parsers::{parse_d_op, preamble::*};
/// # use pddl::{DurationOperator};
/// assert!(parse_d_op("<=").is_value(DurationOperator::LessThanOrEqual));
/// assert!(parse_d_op(">=").is_value(DurationOperator::GreaterOrEqual));
/// assert!(parse_d_op("=").is_value(DurationOperator::Equal));
///```
pub fn parse_d_op<'a, T: Into<Span<'a>>>(input: T) -> ParseResult<'a, DurationOperator> {
// :duration-inequalities
map(
alt((
tag(names::LESS_THAN_OR_EQUAL),
tag(names::GREATER_OR_EQUAL),
tag(names::EQUAL),
)),
|x: Span| DurationOperator::try_from(*x.fragment()).expect("unhandled variant"),
)
.parse(input.into())
}
impl crate::parsers::Parser for DurationOperator {
type Item = DurationOperator;
/// Parses a durative operation.
///
/// ## Example
/// ```
/// # use pddl::{DurationOperator, Parser};
/// let (_, value) = DurationOperator::parse("<=").unwrap();
/// assert_eq!(value, DurationOperator::LessThanOrEqual);
///```
///
/// ## See also
/// See [`parse_d_op`].
fn parse<'a, S: Into<Span<'a>>>(input: S) -> ParseResult<'a, Self::Item> {
parse_d_op(input)
}
}
#[cfg(test)]
mod tests {
use crate::parsers::UnwrapValue;
use crate::{DurationOperator, Parser};
#[test]
fn test_parse() {
assert!(DurationOperator::parse("<=").is_value(DurationOperator::LessThanOrEqual));
assert!(DurationOperator::parse(">=").is_value(DurationOperator::GreaterOrEqual));
assert!(DurationOperator::parse("=").is_value(DurationOperator::Equal));
}
}