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svn+ssh://pythondev@svn.python.org/sandbox/trunk/2to3/lib2to3 ........ r61598 | david.wolever | 2008-03-18 23:58:33 -0500 (Di, 18 Mär 2008) | 1 line Added fixer for zip, and refactored a bit of code in the process. Closing #2171. ........ r61599 | david.wolever | 2008-03-19 00:04:26 -0500 (Mi, 19 Mär 2008) | 3 lines Removed a bunch of duplicate code -- it's in util now. ........ r61601 | martin.v.loewis | 2008-03-19 00:21:12 -0500 (Mi, 19 Mär 2008) | 2 lines Fix whitespace. ........
104 lines
3.2 KiB
Python
104 lines
3.2 KiB
Python
"""Fixer for it.next() -> next(it), per PEP 3114."""
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# Author: Collin Winter
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# Things that currently aren't covered:
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# - listcomp "next" names aren't warned
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# - "with" statement targets aren't checked
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# Local imports
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from ..pgen2 import token
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from ..pygram import python_symbols as syms
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from . import basefix
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from .util import Name, Call, find_binding, any
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bind_warning = "Calls to builtin next() possibly shadowed by global binding"
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class FixNext(basefix.BaseFix):
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PATTERN = """
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power< base=any+ trailer< '.' attr='next' > trailer< '(' ')' > >
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power< head=any+ trailer< '.' attr='next' > not trailer< '(' ')' > >
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classdef< 'class' any+ ':'
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suite< any*
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funcdef< 'def'
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name='next'
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parameters< '(' NAME ')' > any+ >
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any* > >
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global=global_stmt< 'global' any* 'next' any* >
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mod=file_input< any+ >
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"""
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order = "pre" # Pre-order tree traversal
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def start_tree(self, tree, filename):
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super(FixNext, self).start_tree(tree, filename)
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self.shadowed_next = False
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def transform(self, node, results):
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assert results
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base = results.get("base")
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attr = results.get("attr")
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name = results.get("name")
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mod = results.get("mod")
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if base:
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if self.shadowed_next:
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attr.replace(Name("__next__", prefix=attr.get_prefix()))
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else:
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base = [n.clone() for n in base]
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base[0].set_prefix("")
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node.replace(Call(Name("next", prefix=node.get_prefix()), base))
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elif name:
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n = Name("__next__", prefix=name.get_prefix())
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name.replace(n)
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elif attr:
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# We don't do this transformation if we're assigning to "x.next".
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# Unfortunately, it doesn't seem possible to do this in PATTERN,
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# so it's being done here.
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if is_assign_target(node):
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head = results["head"]
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if "".join([str(n) for n in head]).strip() == '__builtin__':
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self.warning(node, bind_warning)
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return
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attr.replace(Name("__next__"))
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elif "global" in results:
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self.warning(node, bind_warning)
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self.shadowed_next = True
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elif mod:
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n = find_binding('next', mod)
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if n:
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self.warning(n, bind_warning)
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self.shadowed_next = True
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### The following functions help test if node is part of an assignment
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### target.
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def is_assign_target(node):
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assign = find_assign(node)
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if assign is None:
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return False
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for child in assign.children:
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if child.type == token.EQUAL:
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return False
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elif is_subtree(child, node):
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return True
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return False
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def find_assign(node):
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if node.type == syms.expr_stmt:
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return node
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if node.type == syms.simple_stmt or node.parent is None:
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return None
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return find_assign(node.parent)
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def is_subtree(root, node):
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if root == node:
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return True
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return any([is_subtree(c, node) for c in root.children])
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