# 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.
# ==============================================================================

"""Utility functions for creating TFRecord data sets."""

import tensorflow as tf


def int64_feature(value):
    """int64_feature."""
    return tf.train.Feature(int64_list=tf.train.Int64List(value=[value]))


def int64_list_feature(value):
    """int64_list_feature."""
    return tf.train.Feature(int64_list=tf.train.Int64List(value=value))


def bytes_feature(value):
    """bytes_feature."""
    return tf.train.Feature(bytes_list=tf.train.BytesList(value=[value]))


def bytes_list_feature(value):
    """bytes_list_feature."""
    return tf.train.Feature(bytes_list=tf.train.BytesList(value=value))


def float_feature(value):
    """float_feature."""
    return tf.train.Feature(float_list=tf.train.FloatList(value=[value]))


def float_list_feature(value):
    """float_list_feature."""
    return tf.train.Feature(float_list=tf.train.FloatList(value=value))


def recursive_parse_xml_to_dict(xml):
    """Recursively parses XML contents to python dict.

    We assume that `object` tags are the only ones that can appear
    multiple times at the same level of a tree.
    Args:
        xml: xml tree obtained by parsing XML file contents using lxml.etree
    Returns:
        Python dictionary holding XML contents.
    """
    if not xml:
        return {xml.tag: xml.text}
    result = {}
    for child in xml:
        child_result = recursive_parse_xml_to_dict(child)
        if child.tag != 'object':
            result[child.tag] = child_result[child.tag]
        else:
            if child.tag not in result:
                result[child.tag] = []
            result[child.tag].append(child_result[child.tag])
    return {xml.tag: result}
