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125 lines
5.9 KiB
125 lines
5.9 KiB
u"""
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Fixer for:
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(a,)* *b (,c)* [,] = s
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for (a,)* *b (,c)* [,] in d: ...
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"""
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from lib2to3 import fixer_base
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from itertools import count
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from lib2to3.fixer_util import (Assign, Comma, Call, Newline, Name,
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Number, token, syms, Node, Leaf)
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from libfuturize.fixer_util import indentation, suitify, commatize
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# from libfuturize.fixer_util import Assign, Comma, Call, Newline, Name, Number, indentation, suitify, commatize, token, syms, Node, Leaf
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def assignment_source(num_pre, num_post, LISTNAME, ITERNAME):
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u"""
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Accepts num_pre and num_post, which are counts of values
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before and after the starg (not including the starg)
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Returns a source fit for Assign() from fixer_util
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"""
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children = []
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try:
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pre = unicode(num_pre)
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post = unicode(num_post)
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except NameError:
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pre = str(num_pre)
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post = str(num_post)
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# This code builds the assignment source from lib2to3 tree primitives.
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# It's not very readable, but it seems like the most correct way to do it.
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if num_pre > 0:
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pre_part = Node(syms.power, [Name(LISTNAME), Node(syms.trailer, [Leaf(token.LSQB, u"["), Node(syms.subscript, [Leaf(token.COLON, u":"), Number(pre)]), Leaf(token.RSQB, u"]")])])
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children.append(pre_part)
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children.append(Leaf(token.PLUS, u"+", prefix=u" "))
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main_part = Node(syms.power, [Leaf(token.LSQB, u"[", prefix=u" "), Name(LISTNAME), Node(syms.trailer, [Leaf(token.LSQB, u"["), Node(syms.subscript, [Number(pre) if num_pre > 0 else Leaf(1, u""), Leaf(token.COLON, u":"), Node(syms.factor, [Leaf(token.MINUS, u"-"), Number(post)]) if num_post > 0 else Leaf(1, u"")]), Leaf(token.RSQB, u"]"), Leaf(token.RSQB, u"]")])])
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children.append(main_part)
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if num_post > 0:
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children.append(Leaf(token.PLUS, u"+", prefix=u" "))
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post_part = Node(syms.power, [Name(LISTNAME, prefix=u" "), Node(syms.trailer, [Leaf(token.LSQB, u"["), Node(syms.subscript, [Node(syms.factor, [Leaf(token.MINUS, u"-"), Number(post)]), Leaf(token.COLON, u":")]), Leaf(token.RSQB, u"]")])])
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children.append(post_part)
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source = Node(syms.arith_expr, children)
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return source
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class FixUnpacking(fixer_base.BaseFix):
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PATTERN = u"""
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expl=expr_stmt< testlist_star_expr<
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pre=(any ',')*
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star_expr< '*' name=NAME >
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post=(',' any)* [','] > '=' source=any > |
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impl=for_stmt< 'for' lst=exprlist<
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pre=(any ',')*
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star_expr< '*' name=NAME >
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post=(',' any)* [','] > 'in' it=any ':' suite=any>"""
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def fix_explicit_context(self, node, results):
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pre, name, post, source = (results.get(n) for n in (u"pre", u"name", u"post", u"source"))
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pre = [n.clone() for n in pre if n.type == token.NAME]
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name.prefix = u" "
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post = [n.clone() for n in post if n.type == token.NAME]
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target = [n.clone() for n in commatize(pre + [name.clone()] + post)]
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# to make the special-case fix for "*z, = ..." correct with the least
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# amount of modification, make the left-side into a guaranteed tuple
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target.append(Comma())
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source.prefix = u""
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setup_line = Assign(Name(self.LISTNAME), Call(Name(u"list"), [source.clone()]))
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power_line = Assign(target, assignment_source(len(pre), len(post), self.LISTNAME, self.ITERNAME))
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return setup_line, power_line
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def fix_implicit_context(self, node, results):
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u"""
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Only example of the implicit context is
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a for loop, so only fix that.
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"""
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pre, name, post, it = (results.get(n) for n in (u"pre", u"name", u"post", u"it"))
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pre = [n.clone() for n in pre if n.type == token.NAME]
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name.prefix = u" "
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post = [n.clone() for n in post if n.type == token.NAME]
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target = [n.clone() for n in commatize(pre + [name.clone()] + post)]
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# to make the special-case fix for "*z, = ..." correct with the least
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# amount of modification, make the left-side into a guaranteed tuple
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target.append(Comma())
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source = it.clone()
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source.prefix = u""
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setup_line = Assign(Name(self.LISTNAME), Call(Name(u"list"), [Name(self.ITERNAME)]))
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power_line = Assign(target, assignment_source(len(pre), len(post), self.LISTNAME, self.ITERNAME))
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return setup_line, power_line
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def transform(self, node, results):
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u"""
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a,b,c,d,e,f,*g,h,i = range(100) changes to
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_3to2list = list(range(100))
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a,b,c,d,e,f,g,h,i, = _3to2list[:6] + [_3to2list[6:-2]] + _3to2list[-2:]
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and
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for a,b,*c,d,e in iter_of_iters: do_stuff changes to
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for _3to2iter in iter_of_iters:
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_3to2list = list(_3to2iter)
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a,b,c,d,e, = _3to2list[:2] + [_3to2list[2:-2]] + _3to2list[-2:]
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do_stuff
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"""
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self.LISTNAME = self.new_name(u"_3to2list")
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self.ITERNAME = self.new_name(u"_3to2iter")
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expl, impl = results.get(u"expl"), results.get(u"impl")
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if expl is not None:
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setup_line, power_line = self.fix_explicit_context(node, results)
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setup_line.prefix = expl.prefix
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power_line.prefix = indentation(expl.parent)
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setup_line.append_child(Newline())
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parent = node.parent
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i = node.remove()
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parent.insert_child(i, power_line)
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parent.insert_child(i, setup_line)
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elif impl is not None:
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setup_line, power_line = self.fix_implicit_context(node, results)
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suitify(node)
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suite = [k for k in node.children if k.type == syms.suite][0]
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setup_line.prefix = u""
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power_line.prefix = suite.children[1].value
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suite.children[2].prefix = indentation(suite.children[2])
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suite.insert_child(2, Newline())
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suite.insert_child(2, power_line)
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suite.insert_child(2, Newline())
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suite.insert_child(2, setup_line)
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results.get(u"lst").replace(Name(self.ITERNAME, prefix=u" "))
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