[Tutor] a bug I cannot solve myself ;-)

[spir ☣]

Hello,


I'm writing a kind of language simulation. Here, an expression like "a#3.b" maps to a NamedData node, with an attribute terms=[('.','a'),('#',3),('.'''b')].
(The lang uses '#' instead of "[...]" for item indexing.)
When this node is "run", the source code maps to a name lookup operation in current scope, passing the terms attr as argument. Below the code with debug prints and the error I get and cannot understand:

==================
class Scope(Code):
    ...
    @staticmethod
    def lookup(scope, terms):
        ''' actual data refered to by name (or context) terms'''
        data = scope    # actually, initial container
        for term in terms:
            (sign,key) = term
            print data, (sign,ATTR,sign==ATTR,sign is ATTR), key
            if sign == "ATTR":    # sign == ATTR='.'
                print "getAttr"
                data = data.getAttr(key)
            else:                 # sign == ITEM='#'
                print "getItem"
                data = data.getItem(key) ####### line 82 #######
        return data
=== output =======
currentScope ('.', '.', True, True) a
getItem
... traceback ...
  File "/home/spir/prog/python/claro/scope.py", line 82, in lookup
    data = data.getItem(key)
AttributeError: 'Scope' object has no attribute 'getItem'
==================

(Scopes actually have no getIem, they're plain symbol (attribute) containers.)

There must be something such obvious I'm too stupid to see it! What do I overlook? How can it branch to the "getItem" side of the choice?


Denis
________________________________

vit esse estrany ☣

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