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//! Provides parsers for assignment operations.
use nom::branch::alt;
use nom::bytes::complete::tag;
use nom::combinator::map;
use crate::parsers::{ParseResult, Span};
use crate::types::assign_op::names;
use crate::types::AssignOp;
/// Parses an assignment operation, i.e. `assign | scale-up | scale-down | increase | decrease`.
///
/// ## Example
/// ```
/// # use pddl::parsers::{parse_assign_op, Span, UnwrapValue};
/// # use pddl::{AssignOp};
/// assert!(parse_assign_op(Span::new("assign")).is_value(AssignOp::Assign));
/// assert!(parse_assign_op(Span::new("scale-up")).is_value(AssignOp::ScaleUp));
///```
pub fn parse_assign_op<'a, T: Into<Span<'a>>>(input: T) -> ParseResult<'a, AssignOp> {
map(
alt((
tag(names::CHANGE), // deprecated
tag(names::ASSIGN),
tag(names::SCALE_UP),
tag(names::SCALE_DOWN),
tag(names::INCREASE),
tag(names::DECREASE),
)),
|x: Span| AssignOp::try_from(*x.fragment()).expect("unhandled variant"),
)(input.into())
}
impl crate::parsers::Parser for AssignOp {
type Item = AssignOp;
/// Parses an assignment operation.
///
/// ## Example
/// ```
/// # use pddl::parsers::{ Span, UnwrapValue};
/// # use pddl::{AssignOp, Parser};
/// let (_, assign_op) = AssignOp::parse("assign").unwrap();
/// assert_eq!(assign_op, AssignOp::Assign);
///
/// let (_, assign_op) = AssignOp::parse("scale-up").unwrap();
/// assert_eq!(assign_op, AssignOp::ScaleUp);
///```
fn parse<'a, S: Into<Span<'a>>>(input: S) -> ParseResult<'a, Self::Item> {
parse_assign_op(input)
}
}
#[cfg(test)]
mod tests {
use crate::{AssignOp, Parser};
#[test]
fn test_parse() {
let (_, assign_op) = AssignOp::parse("assign").unwrap();
assert_eq!(assign_op, AssignOp::Assign);
let (_, assign_op) = AssignOp::parse("scale-up").unwrap();
assert_eq!(assign_op, AssignOp::ScaleUp);
}
}