pddl 0.1.0

A PDDL 3.1 parser, strongly typed
Documentation 
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//! Provides parsers for multi-operand operations.

use nom::branch::alt;
use nom::bytes::complete::tag;
use nom::combinator::map;

use crate::parsers::{ParseResult, Span};
use crate::types::{multi_op::names, MultiOp};

/// Parses a multi-operand operation, i.e. `* | +`.
///
/// ## Example
/// ```
/// # use pddl::parsers::{parse_multi_op, preamble::*};
/// # use pddl::{MultiOp};
/// assert!(parse_multi_op("*").is_value(MultiOp::Multiplication));
/// assert!(parse_multi_op("+").is_value(MultiOp::Addition));
///```
pub fn parse_multi_op<'a, T: Into<Span<'a>>>(input: T) -> ParseResult<'a, MultiOp> {
    map(
        alt((tag(names::MULTIPLICATION), tag(names::ADDITION))),
        |x: Span| MultiOp::try_from(*x.fragment()).expect("unhandled variant"),
    )(input.into())
}

impl crate::parsers::Parser for MultiOp {
    type Item = MultiOp;

    /// See [`parse_multi_op`].
    fn parse<'a, S: Into<Span<'a>>>(input: S) -> ParseResult<'a, Self::Item> {
        parse_multi_op(input)
    }
}

#[cfg(test)]
mod tests {
    use crate::parsers::UnwrapValue;
    use crate::{MultiOp, Parser};

    #[test]
    fn test_parse() {
        assert!(MultiOp::parse("*").is_value(MultiOp::Multiplication));
        assert!(MultiOp::parse("+").is_value(MultiOp::Addition));
    }
}