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77 lines
2.8 KiB
Python
77 lines
2.8 KiB
Python
# Licensed under the GPL: https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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# For details: https://github.com/PyCQA/pylint/blob/master/COPYING
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import collections
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from astroid import nodes
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class ASTWalker:
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def __init__(self, linter):
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# callbacks per node types
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self.nbstatements = 0
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self.visit_events = collections.defaultdict(list)
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self.leave_events = collections.defaultdict(list)
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self.linter = linter
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def _is_method_enabled(self, method):
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if not hasattr(method, "checks_msgs"):
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return True
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for msg_desc in method.checks_msgs:
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if self.linter.is_message_enabled(msg_desc):
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return True
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return False
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def add_checker(self, checker):
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"""walk to the checker's dir and collect visit and leave methods"""
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vcids = set()
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lcids = set()
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visits = self.visit_events
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leaves = self.leave_events
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for member in dir(checker):
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cid = member[6:]
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if cid == "default":
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continue
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if member.startswith("visit_"):
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v_meth = getattr(checker, member)
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# don't use visit_methods with no activated message:
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if self._is_method_enabled(v_meth):
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visits[cid].append(v_meth)
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vcids.add(cid)
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elif member.startswith("leave_"):
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l_meth = getattr(checker, member)
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# don't use leave_methods with no activated message:
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if self._is_method_enabled(l_meth):
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leaves[cid].append(l_meth)
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lcids.add(cid)
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visit_default = getattr(checker, "visit_default", None)
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if visit_default:
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for cls in nodes.ALL_NODE_CLASSES:
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cid = cls.__name__.lower()
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if cid not in vcids:
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visits[cid].append(visit_default)
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# for now we have no "leave_default" method in Pylint
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def walk(self, astroid):
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"""call visit events of astroid checkers for the given node, recurse on
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its children, then leave events.
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"""
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cid = astroid.__class__.__name__.lower()
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# Detect if the node is a new name for a deprecated alias.
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# In this case, favour the methods for the deprecated
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# alias if any, in order to maintain backwards
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# compatibility.
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visit_events = self.visit_events.get(cid, ())
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leave_events = self.leave_events.get(cid, ())
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if astroid.is_statement:
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self.nbstatements += 1
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# generate events for this node on each checker
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for callback in visit_events or ():
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callback(astroid)
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# recurse on children
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for child in astroid.get_children():
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self.walk(child)
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for callback in leave_events or ():
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callback(astroid)
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