# Copyright 2006 Google, Inc. All Rights Reserved. # Licensed to PSF under a Contributor Agreement. """Fixer for apply(). This converts apply(func, v, k) into (func)(*v, **k).""" # Local imports from .. import pytree from ..pgen2 import token from .. import fixer_base from ..fixer_util import Call, Comma, parenthesize class FixApply(fixer_base.BaseFix): BM_compatible = True PATTERN = """ power< 'apply' trailer< '(' arglist< (not argument<NAME '=' any>) func=any ',' (not argument<NAME '=' any>) args=any [',' (not argument<NAME '=' any>) kwds=any] [','] > ')' > > """ def transform(self, node, results): syms = self.syms assert results func = results["func"] args = results["args"] kwds = results.get("kwds") # I feel like we should be able to express this logic in the # PATTERN above but I don't know how to do it so... if args: if (args.type == self.syms.argument and args.children[0].value in {'**', '*'}): return # Make no change. if kwds and (kwds.type == self.syms.argument and kwds.children[0].value == '**'): return # Make no change. prefix = node.prefix func = func.clone() if (func.type not in (token.NAME, syms.atom) and (func.type != syms.power or func.children[-2].type == token.DOUBLESTAR)): # Need to parenthesize func = parenthesize(func) func.prefix = "" args = args.clone() args.prefix = "" if kwds is not None: kwds = kwds.clone() kwds.prefix = "" l_newargs = [pytree.Leaf(token.STAR, "*"), args] if kwds is not None: l_newargs.extend([Comma(), pytree.Leaf(token.DOUBLESTAR, "**"), kwds]) l_newargs[-2].prefix = " " # that's the ** token # XXX Sometimes we could be cleverer, e.g. apply(f, (x, y) + t) # can be translated into f(x, y, *t) instead of f(*(x, y) + t) #new = pytree.Node(syms.power, (func, ArgList(l_newargs))) return Call(func, l_newargs, prefix=prefix)