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# Copyright 2015-2017 Google Inc. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Insert "continuation" nodes into lib2to3 tree.
The "backslash-newline" continuation marker is shoved into the node's prefix.
Pull them out and make it into nodes of their own.
SpliceContinuations(): the main funciton exported by this module.
"""
from lib2to3 import pytree
from yapf.yapflib import format_token
def SpliceContinuations(tree):
"""Given a pytree, splice the continuation marker into nodes.
Arguments:
tree: (pytree.Node) The tree to work on. The tree is modified by this
function.
"""
def RecSplicer(node):
"""Inserts a continuation marker into the node."""
if isinstance(node, pytree.Leaf):
if node.prefix.lstrip().startswith('\\\n'):
new_lineno = node.lineno - node.prefix.count('\n')
return pytree.Leaf(
type=format_token.CONTINUATION,
value=node.prefix,
context=('', (new_lineno, 0)))
return None
num_inserted = 0
for index, child in enumerate(node.children[:]):
continuation_node = RecSplicer(child)
if continuation_node:
node.children.insert(index + num_inserted, continuation_node)
num_inserted += 1
RecSplicer(tree)
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