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Support right-to-left implications

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As right-to-left implications are common in answer set programming, this
adds support for using implications in both directions.
This commit is contained in:
Patrick Lühne
2020-04-13 21:44:02 +02:00
parent 5bbb09eef8
commit 855fd9abcf
2 changed files with 34 additions and 4 deletions
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19
src/format/formulas.rs
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@@ -28,6 +28,18 @@ impl Precedence for crate::Formula
}
}
impl std::fmt::Debug for crate::ImplicationDirection
{
fn fmt(&self, format: &mut std::fmt::Formatter) -> std::fmt::Result
{
match &self
{
Self::LeftToRight => write!(format, "left to right"),
Self::RightToLeft => write!(format, "right to left"),
}
}
}
impl std::fmt::Debug for crate::PredicateDeclaration
{
fn fmt(&self, format: &mut std::fmt::Formatter) -> std::fmt::Result
@@ -140,9 +152,14 @@ impl<'formula> std::fmt::Debug for FormulaDisplay<'formula>
separator = " or "
}
},
crate::Formula::Implies(crate::Implies{antecedent, implication})
crate::Formula::Implies(crate::Implies{
direction: crate::ImplicationDirection::LeftToRight, antecedent, implication})
=> write!(format, "{:?} -> {:?}", display_formula(antecedent, precedence),
display_formula(implication, precedence))?,
crate::Formula::Implies(crate::Implies{
direction: crate::ImplicationDirection::RightToLeft, antecedent, implication})
=> write!(format, "{:?} <- {:?}", display_formula(implication, precedence),
display_formula(antecedent, precedence))?,
crate::Formula::IfAndOnlyIf(crate::IfAndOnlyIf{left, right})
=> write!(format, "{:?} <-> {:?}", display_formula(left, precedence),
display_formula(right, precedence))?,