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//! Provides parsers for binary comparison operations.
use nom::branch::alt;
use nom::bytes::complete::tag;
use nom::combinator::map;
use crate::parsers::{ParseResult, Span};
use crate::types::{binary_comp::names, BinaryComp};
/// Parses a binary comparison operation.
///
/// ## Example
/// ```
/// # use pddl::parsers::{parse_binary_comp, Span, UnwrapValue};
/// # use pddl::{AssignOp, BinaryComp};
/// assert!(parse_binary_comp(Span::new(">")).is_value(BinaryComp::GreaterThan));
/// assert!(parse_binary_comp(Span::new("<")).is_value(BinaryComp::LessThan));
/// assert!(parse_binary_comp(Span::new("=")).is_value(BinaryComp::Equal));
/// assert!(parse_binary_comp(Span::new(">=")).is_value(BinaryComp::GreaterOrEqual));
/// assert!(parse_binary_comp(Span::new("<=")).is_value(BinaryComp::LessThanOrEqual));
///```
pub fn parse_binary_comp<'a, T: Into<Span<'a>>>(input: T) -> ParseResult<'a, BinaryComp> {
map(
alt((
tag(names::GREATER_THAN_OR_EQUAL),
tag(names::LESS_THAN_OR_EQUAL),
tag(names::EQUAL),
tag(names::GREATER_THAN),
tag(names::LESS_THAN),
)),
|x: Span| BinaryComp::try_from(*x.fragment()).expect("unhandled variant"),
)(input.into())
}
impl crate::parsers::Parser for BinaryComp {
type Item = BinaryComp;
/// Parses a binary comparison operation.
///
/// ## Example
/// ```
/// # use pddl::{BinaryComp, Parser};
/// let (_, value) = BinaryComp::parse(">=").unwrap();
/// assert_eq!(value, BinaryComp::GreaterOrEqual);
///```
///
/// ## See also
/// See [`parse_binary_comp`].
fn parse<'a, S: Into<Span<'a>>>(input: S) -> ParseResult<'a, Self::Item> {
parse_binary_comp(input)
}
}
#[cfg(test)]
mod tests {
use crate::{BinaryComp, Parser};
#[test]
fn test_parse() {
let (_, value) = BinaryComp::parse(">=").unwrap();
assert_eq!(value, BinaryComp::GreaterOrEqual);
let (_, value) = BinaryComp::parse(">").unwrap();
assert_eq!(value, BinaryComp::GreaterThan);
let (_, value) = BinaryComp::parse("<=").unwrap();
assert_eq!(value, BinaryComp::LessThanOrEqual);
let (_, value) = BinaryComp::parse("<").unwrap();
assert_eq!(value, BinaryComp::LessThan);
let (_, value) = BinaryComp::parse("=").unwrap();
assert_eq!(value, BinaryComp::Equal);
}
}