49 lines
1.6 KiB
Python
49 lines
1.6 KiB
Python
# Copyright 2017 The TensorFlow Authors. All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# ==============================================================================
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"""Canonicalizes the ternary conditional operator."""
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from __future__ import absolute_import
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from __future__ import division
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from __future__ import print_function
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from tensorflow.contrib.autograph.core import converter
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from tensorflow.contrib.autograph.pyct import templates
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class IfExp(converter.Base):
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"""Canonicalizes all IfExp nodes into plain conditionals."""
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def visit_IfExp(self, node):
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template = """
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ag__.utils.run_cond(test, lambda: (body,), lambda: (orelse,))
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"""
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desugared_ifexp = templates.replace_as_expression(
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template, test=node.test, body=node.body, orelse=node.orelse)
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return desugared_ifexp
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def transform(node, ctx):
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"""Desugar IfExp nodes into plain conditionals.
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Args:
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node: ast.AST, the node to transform
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ctx: converter.EntityContext
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Returns:
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new_node: an AST with no IfExp nodes, only conditionals.
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"""
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node = IfExp(ctx).visit(node)
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return node
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