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//! Provides parsers for pre-GD goal definitions.
use crate::parsers::{parse_pre_gd, prefix_expr, ParseResult, Span};
use crate::types::ProblemGoalDefinition;
use nom::combinator::map;
use nom::Parser;
/// Parses pre-GD goal definitions.
///
/// ## Example
/// ```
/// # use pddl::parsers::{parse_problem_goal_def, preamble::*};
/// # use pddl::{AtomicFormula, GoalDefinition, ProblemGoalDefinition, PreferenceGoalDefinition, PreconditionGoalDefinition, Term};
/// let input = "(:goal (= x y))";
/// assert!(parse_problem_goal_def(input).is_value(
/// ProblemGoalDefinition::from(
/// PreconditionGoalDefinition::Preference(
/// PreferenceGoalDefinition::Goal(
/// GoalDefinition::AtomicFormula(
/// AtomicFormula::new_equality(
/// Term::Name("x".into()),
/// Term::Name("y".into())
/// )
/// )
/// )
/// )
/// )
/// ));
/// ```
pub fn parse_problem_goal_def<'a, T: Into<Span<'a>>>(
input: T,
) -> ParseResult<'a, ProblemGoalDefinition> {
map(
prefix_expr(":goal", parse_pre_gd),
ProblemGoalDefinition::new,
)
.parse(input.into())
}
impl crate::parsers::Parser for ProblemGoalDefinition {
type Item = ProblemGoalDefinition;
/// See [`parse_problem_goal_def`].
fn parse<'a, S: Into<Span<'a>>>(input: S) -> ParseResult<'a, Self::Item> {
parse_problem_goal_def(input)
}
}
#[cfg(test)]
mod tests {
use crate::parsers::UnwrapValue;
use crate::{
AtomicFormula, GoalDefinition, Parser, PreconditionGoalDefinition,
PreferenceGoalDefinition, ProblemGoalDefinition, Term,
};
#[test]
fn test_parse() {
let input = "(:goal (= x y))";
assert!(
ProblemGoalDefinition::parse(input).is_value(ProblemGoalDefinition::from(
PreconditionGoalDefinition::Preference(PreferenceGoalDefinition::Goal(
GoalDefinition::AtomicFormula(AtomicFormula::new_equality(
Term::Name("x".into()),
Term::Name("y".into())
))
))
))
);
}
}