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//! Provides parsers for binary-operand operations.
use nom::branch::alt;
use nom::bytes::complete::tag;
use nom::combinator::map;
use crate::parsers::{ParseResult, Span};
use crate::types::{binary_op::names, BinaryOp};
/// Parses a two-operand operation, i.e. `* | + | - | /`.
///
/// ## Example
/// ```
/// # use pddl::parsers::{parse_binary_op, Span, UnwrapValue};
/// # use pddl::{BinaryOp};
/// assert!(parse_binary_op(Span::new("*")).is_value(BinaryOp::Multiplication));
/// assert!(parse_binary_op(Span::new("+")).is_value(BinaryOp::Addition));
/// assert!(parse_binary_op(Span::new("-")).is_value(BinaryOp::Subtraction));
/// assert!(parse_binary_op(Span::new("/")).is_value(BinaryOp::Division));
///```
pub fn parse_binary_op<'a, T: Into<Span<'a>>>(input: T) -> ParseResult<'a, BinaryOp> {
map(
alt((
tag(names::MULTIPLICATION),
tag(names::ADDITION),
tag(names::SUBTRACTION),
tag(names::DIVISION),
)),
|x: Span| BinaryOp::try_from(*x.fragment()).expect("unhandled variant"),
)(input.into())
}
impl crate::parsers::Parser for BinaryOp {
type Item = BinaryOp;
/// Parses a two-operand operation.
///
/// ## Example
/// ```
/// # use pddl::{BinaryOp, Parser};
/// let (_, value) = BinaryOp::parse("*").unwrap();
/// assert_eq!(value, BinaryOp::Multiplication);
///```
///
/// ## See also.
/// See [`parse_binary_op`].
fn parse<'a, S: Into<Span<'a>>>(input: S) -> ParseResult<'a, Self::Item> {
parse_binary_op(input)
}
}
#[cfg(test)]
mod tests {
use crate::{BinaryOp, Parser};
#[test]
fn test_parse() {
let (_, value) = BinaryOp::parse("*").unwrap();
assert_eq!(value, BinaryOp::Multiplication);
let (_, value) = BinaryOp::parse("/").unwrap();
assert_eq!(value, BinaryOp::Division);
let (_, value) = BinaryOp::parse("+").unwrap();
assert_eq!(value, BinaryOp::Addition);
let (_, value) = BinaryOp::parse("-").unwrap();
assert_eq!(value, BinaryOp::Subtraction);
}
}