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tiny abstract data type on python

Project description

how to use

## create Type

>>> from miniadt import ADTTypeProvider, dispatchmethod
>>> TreeType = ADTTypeProvider("Tree")

>>> Node = TreeType("Node", "e children")
>>> Leaf = TreeType("Leaf", "e")


## printing value

>>> Leaf(e=10)
Leaf(e=10)
>>> Node(e=10, children=[Leaf(e=20)])
Node(e=10, children=[Leaf(e=20)])


## use pattern match

>>> @TreeType.match
... class depth(object):
...     @dispatchmethod
...     def Node(e, children):
...         return max(depth(e)for e in children) + 1
...
...     @dispatchmethod
...     def Leaf(e):
...         return 1

>>> depth(Leaf(e=10))
1

>>> depth(Node(e=10, children=[Leaf(e=20), Node(e=30, children=[Leaf(e=40)])]))
3

miniadt has comprehensive check function.

## not comprehensive definition on pattern matching function error is occur

### 1. lack of dispatch candidates
>>> class invalid_dispatch(object):
...     @dispatchmethod
...     def Node(e, children):
...         return "foo"

>>> TreeType.match(invalid_dispatch)
Traceback (most recent call last):
 ...
miniadt.NotComprehensive: ['Node'] != ['Leaf', 'Node']


### 2. dispatch function's arguments are invalid.
>>> class invalid_dispatch2(object):
...     @dispatchmethod
...     def Node(e):  ## correct argsspec is "e, children"
...         return "foo"
...     @dispatchmethod
...     def Leaf(e):
...         return "foo"

>>> TreeType.match(invalid_dispatch2)
Traceback (most recent call last):
 ...
miniadt.NotComprehensive: on Tree.Node:  ['e', 'children'] != ['e']

Project details


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