pddl 0.1.0

A PDDL 3.1 parser, strongly typed
Documentation 
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//! Provides parsers for problem constraint definitions.

use nom::combinator::map;

use crate::parsers::{parse_pref_con_gd, prefix_expr, ParseResult, Span};
use crate::types::ProblemConstraintsDef;

/// Parses problem constraint definitions, i.e. `(:constraints <pref-con-GD>)`.
///
/// ## Example
/// ```
/// # use pddl::parsers::{parse_problem_constraints_def, preamble::*};
/// # use pddl::{ConGD, ProblemConstraintsDef, PrefConGDs};
/// let input = "(:constraints (preference test (and)))";
/// assert!(parse_problem_constraints_def(input).is_value(
///     ProblemConstraintsDef::new(
///         PrefConGDs::new_preference(Some("test".into()), ConGD::new_and([]))
///     )
/// ));
/// ```
pub fn parse_problem_constraints_def<'a, T: Into<Span<'a>>>(
    input: T,
) -> ParseResult<'a, ProblemConstraintsDef> {
    // :constraints
    map(
        prefix_expr(":constraints", parse_pref_con_gd),
        ProblemConstraintsDef::new,
    )(input.into())
}

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

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

#[cfg(test)]
mod tests {
    use crate::parsers::preamble::*;
    use crate::{ConGD, PrefConGDs, ProblemConstraintsDef};

    #[test]
    fn test_parse() {
        let input = "(:constraints (preference test (and)))";
        assert!(
            ProblemConstraintsDef::parse(input).is_value(ProblemConstraintsDef::new(
                PrefConGDs::new_preference(Some("test".into()), ConGD::new_and([]))
            ))
        );
    }
}