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fix_dict.py3.7 KB · 107 lines
# Copyright 2007 Google, Inc. All Rights Reserved.# Licensed to PSF under a Contributor Agreement. """Fixer for dict methods. d.keys() -> list(d.keys())d.items() -> list(d.items())d.values() -> list(d.values()) d.iterkeys() -> iter(d.keys())d.iteritems() -> iter(d.items())d.itervalues() -> iter(d.values()) d.viewkeys() -> d.keys()d.viewitems() -> d.items()d.viewvalues() -> d.values() Except in certain very specific contexts: the iter() can be droppedwhen the context is list(), sorted(), iter() or for...in; the list()can be dropped when the context is list() or sorted() (but not iter()or for...in!). Special contexts that apply to both: list(), sorted(), tuple()set(), any(), all(), sum(). Note: iter(d.keys()) could be written as iter(d) but since theoriginal d.iterkeys() was also redundant we don't fix this.  And thereare (rare) contexts where it makes a difference (e.g. when passing itas an argument to a function that introspects the argument).""" # Local importsfrom .. import pytreefrom .. import patcompfrom .. import fixer_basefrom ..fixer_util import Name, Call, Dotfrom .. import fixer_util  iter_exempt = fixer_util.consuming_calls | {"iter"}  class FixDict(fixer_base.BaseFix):    BM_compatible = True     PATTERN = """    power< head=any+         trailer< '.' method=('keys'|'items'|'values'|                              'iterkeys'|'iteritems'|'itervalues'|                              'viewkeys'|'viewitems'|'viewvalues') >         parens=trailer< '(' ')' >         tail=any*    >    """     def transform(self, node, results):        head = results["head"]        method = results["method"][0] # Extract node for method name        tail = results["tail"]        syms = self.syms        method_name = method.value        isiter = method_name.startswith("iter")        isview = method_name.startswith("view")        if isiter or isview:            method_name = method_name[4:]        assert method_name in ("keys", "items", "values"), repr(method)        head = [n.clone() for n in head]        tail = [n.clone() for n in tail]        special = not tail and self.in_special_context(node, isiter)        args = head + [pytree.Node(syms.trailer,                                   [Dot(),                                    Name(method_name,                                         prefix=method.prefix)]),                       results["parens"].clone()]        new = pytree.Node(syms.power, args)        if not (special or isview):            new.prefix = ""            new = Call(Name("iter" if isiter else "list"), [new])        if tail:            new = pytree.Node(syms.power, [new] + tail)        new.prefix = node.prefix        return new     P1 = "power< func=NAME trailer< '(' node=any ')' > any* >"    p1 = patcomp.compile_pattern(P1)     P2 = """for_stmt< 'for' any 'in' node=any ':' any* >            | comp_for< 'for' any 'in' node=any any* >         """    p2 = patcomp.compile_pattern(P2)     def in_special_context(self, node, isiter):        if node.parent is None:            return False        results = {}        if (node.parent.parent is not None and               self.p1.match(node.parent.parent, results) and               results["node"] is node):            if isiter:                # iter(d.iterkeys()) -> iter(d.keys()), etc.                return results["func"].value in iter_exempt            else:                # list(d.keys()) -> list(d.keys()), etc.                return results["func"].value in fixer_util.consuming_calls        if not isiter:            return False        # for ... in d.iterkeys() -> for ... in d.keys(), etc.        return self.p2.match(node.parent, results) and results["node"] is node