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//! Provides parsers for assignment 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::assign_op_t::names;
use crate::types::TimedAssignOperator;
/// Parses an assignment operation, i.e. `increase | decrease`.
///
/// ## Example
/// ```
/// # use pddl::parsers::{parse_assign_op_t, Span, UnwrapValue};
/// # use pddl::{TimedAssignOperator};
/// assert!(parse_assign_op_t(Span::new("increase")).is_value(TimedAssignOperator::Increase));
/// assert!(parse_assign_op_t(Span::new("decrease")).is_value(TimedAssignOperator::Decrease));
///```
pub fn parse_assign_op_t<'a, T: Into<Span<'a>>>(input: T) -> ParseResult<'a, TimedAssignOperator> {
map(
alt((tag(names::INCREASE), tag(names::DECREASE))),
|x: Span| TimedAssignOperator::try_from(*x.fragment()).expect("unhandled variant"),
)
.parse(input.into())
}
impl crate::parsers::Parser for TimedAssignOperator {
type Item = TimedAssignOperator;
/// Parses an assignment operation.
///
/// ## Example
/// ```
/// # use pddl::{TimedAssignOperator, Parser};
/// let (_, value) = TimedAssignOperator::parse("increase").unwrap();
/// assert_eq!(value, TimedAssignOperator::Increase);
///```
///
/// ## See also
/// See [`parse_assign_op_t`].
fn parse<'a, S: Into<Span<'a>>>(input: S) -> ParseResult<'a, Self::Item> {
parse_assign_op_t(input)
}
}
#[cfg(test)]
mod tests {
use crate::{Parser, TimedAssignOperator};
#[test]
fn test_parse() {
let (_, value) = TimedAssignOperator::parse("increase").unwrap();
assert_eq!(value, TimedAssignOperator::Increase);
}
}