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definition:
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getTreesValue :: Int -> [Tree a] -> a
getTreesValue _ [] = error "getTreesValue: nothing selected" -- should not occur
getTreesValue n (Leaf _ v : trees) =
if n==0 then v
else getTreesValue (n-1) trees
getTreesValue n (Node t v subtrees : trees) =
if n==0 then v
else let l = length (tree2strings 0 (Node t v subtrees)) in
if n < l
then getTreesValue (n-1) subtrees
else getTreesValue (n-l) trees
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demand:
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argument 2
|
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deterministic:
|
deterministic operation
|
|
documentation:
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-- get selected value in the tree list:
|
|
indeterministic:
|
referentially transparent operation
|
|
infix:
|
no fixity defined
|
|
iotype:
|
{(_,{:}) |-> _}
|
|
name:
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getTreesValue
|
|
precedence:
|
no precedence defined
|
|
result-values:
|
_
|
|
signature:
|
Prelude.Int -> [Tree a] -> a
|
|
solution-complete:
|
operation might suspend on free variables
|
|
terminating:
|
possibly non-terminating
|
|
totally-defined:
|
possibly non-reducible on same data term
|