# From https://github.com/fmenabe/python-yamlordereddictloader/
# Temporarily brought in until @fmenabe updates the package on PyPI
# -*- coding: utf-8 -*-
"""A YAML loader that loads mappings into ordered dictionaries.
(http://stackoverflow.com/questions/5121931/in-python-how-can-you-load-yaml-mappings-as-ordereddicts)
"""

import yaml
import sys
if float('%d.%d' % sys.version_info[:2]) < 2.7:
    from ordereddict import OrderedDict
else:
    from collections import OrderedDict


class Loader(yaml.Loader):
    def __init__(self, *args, **kwargs):
        yaml.Loader.__init__(self, *args, **kwargs)
        self.add_constructor(
            'tag:yaml.org,2002:map', type(self).construct_yaml_map)
        self.add_constructor(
            'tag:yaml.org,2002:omap', type(self).construct_yaml_map)

    def construct_yaml_map(self, node):
        data = OrderedDict()
        yield data
        value = self.construct_mapping(node)
        data.update(value)

    def construct_mapping(self, node, deep=False):
        if isinstance(node, yaml.MappingNode):
            self.flatten_mapping(node)
        else:
            msg = 'expected a mapping node, but found %s' % node.id
            raise yaml.constructor.ConstructError(None,
                                                  None,
                                                  msg,
                                                  node.start_mark)

        mapping = OrderedDict()
        for key_node, value_node in node.value:
            key = self.construct_object(key_node, deep=deep)
            try:
                hash(key)
            except TypeError as err:
                raise yaml.constructor.ConstructError(
                    'while constructing a mapping', node.start_mark,
                    'found unacceptable key (%s)' % err, key_node.start_mark)
            value = self.construct_object(value_node, deep=deep)
            mapping[key] = value
        return mapping


def represent_ordereddict(self, data):
    return self.represent_mapping('tag:yaml.org,2002:map', data.items())


class Dumper(yaml.Dumper):
    def __init__(self, *args, **kwargs):
        yaml.Dumper.__init__(self, *args, **kwargs)
        self.add_representer(OrderedDict, type(self).represent_ordereddict)

    represent_ordereddict = represent_ordereddict


class SafeDumper(yaml.SafeDumper):
    def __init__(self, *args, **kwargs):
        yaml.SafeDumper.__init__(self, *args, **kwargs)
        self.add_representer(OrderedDict, type(self).represent_ordereddict)

    represent_ordereddict = represent_ordereddict
