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# Copyright 2018 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.
# ==============================================================================
"""Function for interpolating formatted errors from the TensorFlow runtime.
Exposes the function `interpolate` to interpolate messages with tags of the form
^^type:name:format^^.
"""
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
import collections
import itertools
import re
import string
import six
_NAME_REGEX = r"[A-Za-z0-9.][A-Za-z0-9_.\-/]*?"
_FORMAT_REGEX = r"[A-Za-z0-9_.\-/${}:]+"
_TAG_REGEX = r"\^\^({name}):({name}):({fmt})\^\^".format(
name=_NAME_REGEX, fmt=_FORMAT_REGEX)
_INTERPOLATION_REGEX = r"^(.*?)({tag})".format(tag=_TAG_REGEX)
_INTERPOLATION_PATTERN = re.compile(_INTERPOLATION_REGEX)
_ParseTag = collections.namedtuple("_ParseTag", ["type", "name", "format"])
def _parse_message(message):
"""Parses the message.
Splits the message into separators and tags. Tags are named tuples
representing the string ^^type:name:format^^ and they are separated by
separators. For example, in
"123^^node:Foo:${file}^^456^^node:Bar:${line}^^789", there are two tags and
three separators. The separators are the numeric characters.
Args:
message: String to parse
Returns:
(list of separator strings, list of _ParseTags).
For example, if message is "123^^node:Foo:${file}^^456" then this function
returns (["123", "456"], [_ParseTag("node", "Foo", "${file}")])
"""
seps = []
tags = []
pos = 0
while pos < len(message):
match = re.match(_INTERPOLATION_PATTERN, message[pos:])
if match:
seps.append(match.group(1))
tags.append(_ParseTag(match.group(3), match.group(4), match.group(5)))
pos += match.end()
else:
break
seps.append(message[pos:])
return seps, tags
# TODO(jtkeeling): Modify to actually interpolate format strings rather than
# echoing them.
def interpolate(error_message):
"""Interpolates an error message.
The error message can contain tags of the form ^^type:name:format^^ which will
be replaced.
Args:
error_message: A string to interpolate.
Returns:
The string with tags of the form ^^type:name:format^^ interpolated.
"""
seps, tags = _parse_message(error_message)
subs = [string.Template(tag.format).safe_substitute({}) for tag in tags]
return "".join(
itertools.chain(*six.moves.zip_longest(seps, subs, fillvalue="")))
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