| definition: |
testBoolCase :: [TABranchExpr] -> Maybe (TAExpr, TAExpr)
testBoolCase brs
= if length brs /= 2 then Nothing else case (head brs, brs !! 1) of
(ABranch (APattern _ (c1, _) _) e1, ABranch (APattern _ (c2, _) _) e2) ->
if c1 == pre "False" && c2 == pre "True"
then Just (e1, e2)
else if c1 == pre "True" && c2 == pre "False"
then Just (e2, e1)
else Nothing
_ -> Nothing
|
| demand: |
no demanded arguments |
| deterministic: |
deterministic operation |
| documentation: |
--- Tests whether the given branches of a case expressions --- are a Boolean case distinction. --- If yes, the expressions of the `False` and `True` branch --- are returned. |
| failfree: |
<FAILING> |
| indeterministic: |
referentially transparent operation |
| infix: |
no fixity defined |
| iotype: |
{(_) |-> {Just,Nothing}}
|
| name: |
testBoolCase |
| precedence: |
no precedence defined |
| result-values: |
{Just,Nothing}
|
| signature: |
[FlatCurry.Annotated.Types.ABranchExpr FlatCurry.Types.TypeExpr] -> Prelude.Maybe (FlatCurry.Annotated.Types.AExpr FlatCurry.Types.TypeExpr, FlatCurry.Annotated.Types.AExpr FlatCurry.Types.TypeExpr) |
| solution-complete: |
operation might suspend on free variables |
| terminating: |
possibly non-terminating |
| totally-defined: |
possibly non-reducible on same data term |