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//! Provides parsers for metric f-exps.
use crate::parsers::{
parens, parse_function_symbol, parse_name, parse_number, parse_pref_name, prefix_expr,
space_separated_list0, space_separated_list1, ws, ParseResult, Span,
};
use crate::parsers::{parse_binary_op, parse_multi_op};
use crate::types::MetricFluentExpression;
use nom::branch::alt;
use nom::bytes::complete::tag;
use nom::character::complete::{char, multispace0, multispace1};
use nom::combinator::map;
use nom::sequence::preceded;
use nom::Parser;
/// Parses a metric f-exp.
///
/// ## Example
/// ```
/// # use pddl::parsers::{parse_metric_f_exp, preamble::*};
/// # use pddl::{BinaryOp, MetricFluentExpression, FunctionSymbol, MultiOp, Name, PreferenceName};
/// assert!(parse_metric_f_exp("1.23").is_value(
/// MetricFluentExpression::number(1.23)
/// ));
///
/// assert!(parse_metric_f_exp("(- total-time)").is_value(
/// MetricFluentExpression::negative(
/// MetricFluentExpression::TotalTime
/// )
/// ));
///
/// assert!(parse_metric_f_exp("(+ 1.23 2.34)").is_value(
/// MetricFluentExpression::binary_op(
/// BinaryOp::Addition,
/// MetricFluentExpression::number(1.23),
/// MetricFluentExpression::number(2.34)
/// )
/// ));
///
/// assert!(parse_metric_f_exp("(+ 1.23 2.34 3.45)").is_value(
/// MetricFluentExpression::multi_op(
/// MultiOp::Addition,
/// MetricFluentExpression::number(1.23),
/// [MetricFluentExpression::number(2.34), MetricFluentExpression::number(3.45)]
/// )
/// ));
///
/// assert!(parse_metric_f_exp("(is-violated preference)").is_value(
/// MetricFluentExpression::is_violated(
/// PreferenceName::from("preference")
/// )
/// ));
///
/// assert!(parse_metric_f_exp("fun-sym").is_value(
/// MetricFluentExpression::function(
/// FunctionSymbol::string("fun-sym"),
/// []
/// )
/// ));
///
/// assert!(parse_metric_f_exp("(fun-sym)").is_value(
/// MetricFluentExpression::function(
/// FunctionSymbol::string("fun-sym"),
/// []
/// )
/// ));
///
/// assert!(parse_metric_f_exp("(fun-sym a b c)").is_value(
/// MetricFluentExpression::function(
/// FunctionSymbol::string("fun-sym"),
/// [
/// Name::new("a"),
/// Name::new("b"),
/// Name::new("c")
/// ]
/// )
/// ));
///```
pub fn parse_metric_f_exp<'a, T: Into<Span<'a>>>(
input: T,
) -> ParseResult<'a, MetricFluentExpression> {
let binary_op = map(
parens((
parse_binary_op,
preceded(multispace1, parse_metric_f_exp),
preceded(multispace1, parse_metric_f_exp),
)),
|(op, lhs, rhs)| MetricFluentExpression::binary_op(op, lhs, rhs),
);
let multi_op = map(
parens((
parse_multi_op,
preceded(multispace1, parse_metric_f_exp),
preceded(multispace1, space_separated_list1(parse_metric_f_exp)),
)),
|(op, lhs, rhs)| MetricFluentExpression::multi_op(op, lhs, rhs),
);
let negated = map(
parens(preceded((char('-'), multispace0), parse_metric_f_exp)),
MetricFluentExpression::new_negative,
);
let number = map(parse_number, MetricFluentExpression::new_number);
let simple_function = map(parse_function_symbol, |sym| {
MetricFluentExpression::function(sym, [])
});
let complex_function = map(
parens((parse_function_symbol, ws(space_separated_list0(parse_name)))),
|(sym, names)| MetricFluentExpression::function(sym, names),
);
let total_time = map(tag("total-time"), |_| MetricFluentExpression::total_time());
// :preferences
let is_violated = map(
prefix_expr("is-violated", parse_pref_name),
MetricFluentExpression::new_is_violated,
);
alt((
number,
binary_op,
multi_op,
negated,
total_time,
is_violated,
complex_function,
simple_function,
))
.parse(input.into())
}
impl crate::parsers::Parser for MetricFluentExpression {
type Item = MetricFluentExpression;
/// See [`parse_metric_f_exp`].
fn parse<'a, S: Into<Span<'a>>>(input: S) -> ParseResult<'a, Self::Item> {
parse_metric_f_exp(input)
}
}
#[cfg(test)]
mod tests {
use crate::parsers::preamble::*;
use crate::{BinaryOp, FunctionSymbol, MetricFluentExpression, MultiOp, Name, PreferenceName};
#[test]
fn test_parse() {
assert!(
MetricFluentExpression::parse("1.23").is_value(MetricFluentExpression::number(1.23))
);
assert!(MetricFluentExpression::parse("(- total-time)").is_value(
MetricFluentExpression::negative(MetricFluentExpression::TotalTime)
));
assert!(MetricFluentExpression::parse("(+ 1.23 2.34)").is_value(
MetricFluentExpression::binary_op(
BinaryOp::Addition,
MetricFluentExpression::number(1.23),
MetricFluentExpression::number(2.34)
)
));
assert!(
MetricFluentExpression::parse("(+ 1.23 2.34 3.45)").is_value(
MetricFluentExpression::multi_op(
MultiOp::Addition,
MetricFluentExpression::number(1.23),
[
MetricFluentExpression::number(2.34),
MetricFluentExpression::number(3.45)
]
)
)
);
assert!(
MetricFluentExpression::parse("(is-violated preference)").is_value(
MetricFluentExpression::is_violated(PreferenceName::from("preference"))
)
);
assert!(MetricFluentExpression::parse("fun-sym").is_value(
MetricFluentExpression::function(FunctionSymbol::string("fun-sym"), [])
));
assert!(MetricFluentExpression::parse("(fun-sym)").is_value(
MetricFluentExpression::function(FunctionSymbol::string("fun-sym"), [])
));
assert!(MetricFluentExpression::parse("(fun-sym a b c)").is_value(
MetricFluentExpression::function(
FunctionSymbol::string("fun-sym"),
[Name::new("a"), Name::new("b"), Name::new("c")]
)
));
}
}