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//! Provides parsers for p-effects.
use crate::parsers::{
atomic_formula, parse_assign_op, parse_f_exp, parse_f_head, parse_function_term, parse_term,
ParseResult, Span,
};
use crate::parsers::{parens, prefix_expr};
use crate::types::PrimitiveEffect;
use nom::branch::alt;
use nom::bytes::complete::tag;
use nom::character::complete::multispace1;
use nom::combinator::map;
use nom::sequence::{preceded, terminated};
use nom::Parser;
/// Parses p-effects.
///
/// ## Example
/// ```
/// # use pddl::parsers::{parse_p_effect, preamble::*};
/// # use pddl::{AssignOp, AtomicFormula, EqualityAtomicFormula, FluentExpression, FunctionHead, FunctionSymbol, FunctionTerm, PrimitiveEffect, Term};
/// assert!(parse_p_effect("(= x y)").is_value(
/// PrimitiveEffect::AtomicFormula(AtomicFormula::Equality(
/// EqualityAtomicFormula::new(
/// Term::Name("x".into()),
/// Term::Name("y".into()))
/// )
/// )
/// ));
///
/// assert!(parse_p_effect("(not (= ?a B))").is_value(
/// PrimitiveEffect::NotAtomicFormula(AtomicFormula::Equality(
/// EqualityAtomicFormula::new(
/// Term::Variable("a".into()),
/// Term::Name("B".into()))
/// )
/// )
/// ));
///
/// assert!(parse_p_effect("(assign fun-sym 1.23)").is_value(
/// PrimitiveEffect::numeric_fluent(
/// AssignOp::Assign,
/// FunctionHead::new(FunctionSymbol::string("fun-sym")),
/// FluentExpression::number(1.23)
/// )
/// ));
///
/// assert!(parse_p_effect("(assign fun-sym 1.23)").is_value(
/// PrimitiveEffect::numeric_fluent(
/// AssignOp::Assign,
/// FunctionHead::new(FunctionSymbol::string("fun-sym")),
/// FluentExpression::number(1.23)
/// )
/// ));
///
/// assert!(parse_p_effect("(assign (fun-sym) undefined)").is_value(
/// PrimitiveEffect::object_fluent(
/// FunctionTerm::new(FunctionSymbol::string("fun-sym"), []),
/// None
/// )
/// ));
///
/// assert!(parse_p_effect("(assign (fun-sym) something)").is_value(
/// PrimitiveEffect::object_fluent(
/// FunctionTerm::new(FunctionSymbol::string("fun-sym"), []),
/// Some(Term::Name("something".into()))
/// )
/// ));
/// ```
pub fn parse_p_effect<'a, T: Into<Span<'a>>>(input: T) -> ParseResult<'a, PrimitiveEffect> {
let is = map(atomic_formula(parse_term), PrimitiveEffect::new);
let is_not = map(prefix_expr("not", atomic_formula(parse_term)), |af| {
PrimitiveEffect::not(af)
});
// :numeric-fluents
let numeric = map(
parens((
parse_assign_op,
preceded(multispace1, parse_f_head),
preceded(multispace1, parse_f_exp),
)),
|(op, head, exp)| PrimitiveEffect::numeric_fluent(op, head, exp),
);
// :object-fluents
let object_undefined = map(
prefix_expr(
"assign",
terminated(parse_function_term, (multispace1, tag("undefined"))),
),
|f_term| PrimitiveEffect::object_fluent(f_term, None),
);
let object = map(
prefix_expr(
"assign",
(parse_function_term, preceded(multispace1, parse_term)),
),
|(f_term, term)| PrimitiveEffect::object_fluent(f_term, Some(term)),
);
alt((is_not, object_undefined, object, numeric, is)).parse(input.into())
}
impl crate::parsers::Parser for PrimitiveEffect {
type Item = PrimitiveEffect;
/// See [`parse_p_effect`].
fn parse<'a, S: Into<Span<'a>>>(input: S) -> ParseResult<'a, Self::Item> {
parse_p_effect(input)
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::parsers::UnwrapValue;
use crate::{
AssignOp, AtomicFormula, EqualityAtomicFormula, FluentExpression, FunctionHead,
FunctionSymbol, FunctionTerm, Parser, Term,
};
#[test]
fn it_works() {
let input = "(can-move ?from-waypoint ?to-waypoint)";
let (_, _effect) = parse_p_effect(Span::new(input)).unwrap();
}
#[test]
fn not_works() {
let input = "(not (at B ?m))";
let mut is_not = map(prefix_expr("not", atomic_formula(parse_term)), |af| {
PrimitiveEffect::not(af)
});
let result: Result<(_, _), _> = nom::Parser::parse(&mut is_not, input.into());
assert!(result.is_ok());
}
#[test]
fn test_parse() {
assert!(
PrimitiveEffect::parse("(= x y)").is_value(PrimitiveEffect::AtomicFormula(
AtomicFormula::Equality(EqualityAtomicFormula::new(
Term::Name("x".into()),
Term::Name("y".into())
))
))
);
assert!(PrimitiveEffect::parse("(not (= ?a B))").is_value(
PrimitiveEffect::NotAtomicFormula(AtomicFormula::Equality(EqualityAtomicFormula::new(
Term::Variable("a".into()),
Term::Name("B".into())
)))
));
assert!(PrimitiveEffect::parse("(assign fun-sym 1.23)").is_value(
PrimitiveEffect::numeric_fluent(
AssignOp::Assign,
FunctionHead::new(FunctionSymbol::string("fun-sym")),
FluentExpression::number(1.23)
)
));
assert!(PrimitiveEffect::parse("(assign fun-sym 1.23)").is_value(
PrimitiveEffect::numeric_fluent(
AssignOp::Assign,
FunctionHead::new(FunctionSymbol::string("fun-sym")),
FluentExpression::number(1.23)
)
));
assert!(
PrimitiveEffect::parse("(assign (fun-sym) undefined)").is_value(
PrimitiveEffect::object_fluent(
FunctionTerm::new(FunctionSymbol::string("fun-sym"), []),
None
)
)
);
assert!(
PrimitiveEffect::parse("(assign (fun-sym) something)").is_value(
PrimitiveEffect::object_fluent(
FunctionTerm::new(FunctionSymbol::string("fun-sym"), []),
Some(Term::Name("something".into()))
)
)
);
}
}