50 lines
1.6 KiB
Python
50 lines
1.6 KiB
Python
|
# Copyright 2017 The TensorFlow Authors. 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.
|
||
|
|
# ==============================================================================
|
||
|
|
"""Canonicalizes the ternary conditional operator."""
|
||
|
|
|
||
|
|
from __future__ import absolute_import
|
||
|
|
from __future__ import division
|
||
|
|
from __future__ import print_function
|
||
|
|
|
||
|
|
from tensorflow.contrib.autograph.core import converter
|
||
|
|
from tensorflow.contrib.autograph.pyct import templates
|
||
|
|
|
||
|
|
|
||
|
|
class IfExp(converter.Base):
|
||
|
|
"""Canonicalizes all IfExp nodes into plain conditionals."""
|
||
|
|
|
||
|
|
def visit_IfExp(self, node):
|
||
|
|
template = """
|
||
|
|
ag__.utils.run_cond(test, lambda: (body,), lambda: (orelse,))
|
||
|
|
"""
|
||
|
|
desugared_ifexp = templates.replace_as_expression(
|
||
|
|
template, test=node.test, body=node.body, orelse=node.orelse)
|
||
|
|
return desugared_ifexp
|
||
|
|
|
||
|
|
|
||
|
|
def transform(node, ctx):
|
||
|
|
"""Desugar IfExp nodes into plain conditionals.
|
||
|
|
|
||
|
|
Args:
|
||
|
|
node: ast.AST, the node to transform
|
||
|
|
ctx: converter.EntityContext
|
||
|
|
|
||
|
|
Returns:
|
||
|
|
new_node: an AST with no IfExp nodes, only conditionals.
|
||
|
|
"""
|
||
|
|
|
||
|
|
node = IfExp(ctx).visit(node)
|
||
|
|
return node
|