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Ast.py
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Ast.py
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from tree import TreeNode, Tree
class ASTNode(TreeNode):
def __init__(self, content, *childs, actionID=None):
if actionID is None:
actionID = content
super().__init__(content)
for child in childs:
super().addChild(child)
super().setAttribute("__actionID", actionID)
def __str__(self):
return str(self.getContent())
def __repr__(self):
return repr(self.getContent())
def getActionIdentifier(self):
return super().getAttribute("__actionID")
class ASTActionRegister:
def __init__(self):
self.__idToAction = {}
self.__indexIdToAction = {}
def action(self, *actionIDs, index=-1):
"""
register a function to run at ASTNodes with certain actionIDs
if atBegin is True, then the action will be executed before
its childs
"""
def decorate(function):
for action in actionIDs:
if index != -1:
self.__indexIdToAction.setdefault(str(action), {})\
[index] = function
else:
self.__idToAction[str(action)] = function
return function
return decorate
def getMapping(self):
return self.__idToAction
def getIndexMapping(self):
return self.__indexIdToAction
class AbstractSyntaxTree(Tree):
def __init__(self, root):
assert isinstance(root, ASTNode)
super().__init__(root)
def evaluate(self, ar, currentNode=None):
"""
evaluate the attributes according to the rules registered in ASTActionRegister
"""
index = ar.getIndexMapping()
m = ar.getMapping()
if currentNode is None:
currentNode = self.getRoot()
actionID = currentNode.getActionIdentifier()
for i, child in enumerate(currentNode.getChilds()):
if actionID in index and i in index[actionID]:
index[actionID][i](currentNode, *currentNode.getChilds())
self.evaluate(ar, currentNode=child)
if actionID in m:
m[actionID](currentNode, *currentNode.getChilds())