pddl 0.1.0

A PDDL 3.1 parser, strongly typed
Documentation 
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//! Contains helper traits for dealing with [`ParseResult`] values.

use crate::parsers::{ParseResult, Span};
use crate::Type;

/// A helper trait for dealing with [`ParseResult`] values.
pub trait UnwrapValue<V> {
    /// Unwraps the value or panicks if there was none.
    fn unwrap_value(self) -> V;

    /// Unwraps the value and compares it with the specified value.
    fn is_value(&self, value: V) -> bool;
}

impl<'a, V> UnwrapValue<V> for ParseResult<'a, V>
where
    V: PartialEq,
{
    fn unwrap_value(self) -> V {
        self.expect("expected a value").1
    }

    fn is_value(&self, value: V) -> bool {
        match self {
            Ok((_, lhs)) => lhs.eq(&value),
            Err(_) => false,
        }
    }
}

/// A helper trait for dealing with [`ParseResult`] values.
pub trait Match<V> {
    /// Ensures the parser produced the specified value
    /// and leaves no remaining value to be parsed.
    #[allow(unused)]
    fn is_exactly(&self, value: V) -> bool {
        self.is_result("", value)
    }

    /// Ensures the remainder value are as specified.
    #[allow(unused)]
    fn is_result(&self, remainder: &str, value: V) -> bool;
}

impl<'a, E> Match<Option<&str>> for ParseResult<'a, Option<Span<'a>>, E> {
    fn is_result(&self, remainder: &str, value: Option<&str>) -> bool {
        if let Ok((lhs, rhs)) = self {
            if !remainder.eq(*lhs.fragment()) {
                false
            } else if value.is_none() {
                return rhs.is_none();
            } else if let Some(rhs) = rhs {
                value.eq(&Some(*rhs.fragment()))
            } else {
                false
            }
        } else {
            false
        }
    }
}

impl<'a, T, E> Match<&'a str> for ParseResult<'a, T, E>
where
    T: From<&'a str> + PartialEq,
{
    fn is_result(&self, remainder: &str, value: &'a str) -> bool {
        if let Ok((lhs, rhs)) = self {
            if !remainder.eq(*lhs.fragment()) {
                false
            } else {
                T::from(value).eq(rhs)
            }
        } else {
            false
        }
    }
}

impl<'a, E> Match<Type> for ParseResult<'a, Type, E> {
    fn is_result(&self, remainder: &str, value: Type) -> bool {
        if let Ok((lhs, rhs)) = self {
            if !remainder.eq(*lhs.fragment()) {
                false
            } else {
                value.eq(rhs)
            }
        } else {
            false
        }
    }
}

impl<'a, T, E> Match<Vec<T>> for ParseResult<'a, Vec<T>, E>
where
    T: PartialEq,
{
    fn is_result(&self, remainder: &str, value: Vec<T>) -> bool {
        if let Ok((lhs, rhs)) = self {
            if !remainder.eq(*lhs.fragment()) {
                false
            } else {
                value.eq(rhs)
            }
        } else {
            false
        }
    }
}

#[cfg(test)]
mod test {
    use super::*;
    use crate::parsers::name::parse_any_char;
    use crate::parsers::Match;
    use crate::{Name, Parser};

    #[test]
    fn test_is_value() {
        assert!(Name::parse("abcde").is_value("abcde".into()));
    }

    #[test]
    fn test_is_value_fails() {
        assert!(!Name::parse("abcde").is_value("xyz".into()));
        assert!(!Name::parse("-").is_value("abcde".into()));
    }

    #[test]
    fn test_unwrap_value() {
        assert_eq!(Name::parse("abcde").unwrap_value(), "abcde");
    }

    #[test]
    fn test_is_exactly() {
        assert!(Name::parse(Span::new("abcde")).is_exactly("abcde"));
    }

    #[test]
    fn test_is_er() {
        assert!(parse_any_char(Span::new(".")).is_err());
    }
}