mirror of https://github.com/esphome/esphome.git
162 lines
4.9 KiB
Python
162 lines
4.9 KiB
Python
from __future__ import print_function
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import codecs
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import logging
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from collections import OrderedDict
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import yaml
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from esphomeyaml.core import ESPHomeYAMLError, HexInt, IPAddress
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_LOGGER = logging.getLogger(__name__)
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class NodeListClass(list):
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"""Wrapper class to be able to add attributes on a list."""
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pass
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class NodeStrClass(unicode):
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"""Wrapper class to be able to add attributes on a string."""
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pass
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class SafeLineLoader(yaml.SafeLoader):
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"""Loader class that keeps track of line numbers."""
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def compose_node(self, parent, index):
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"""Annotate a node with the first line it was seen."""
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last_line = self.line # type: int
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node = super(SafeLineLoader, self).compose_node(parent, index) # type: yaml.nodes.Node
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node.__line__ = last_line + 1
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return node
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def load_yaml(fname):
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"""Load a YAML file."""
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try:
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with codecs.open(fname, encoding='utf-8') as conf_file:
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return yaml.load(conf_file, Loader=SafeLineLoader) or OrderedDict()
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except yaml.YAMLError as exc:
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_LOGGER.error(exc)
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raise ESPHomeYAMLError(exc)
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except UnicodeDecodeError as exc:
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_LOGGER.error(u"Unable to read file %s: %s", fname, exc)
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raise ESPHomeYAMLError(exc)
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def dump(dict_):
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"""Dump YAML to a string and remove null."""
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return yaml.safe_dump(
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dict_, default_flow_style=False, allow_unicode=True)
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def _ordered_dict(loader, node):
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"""Load YAML mappings into an ordered dictionary to preserve key order."""
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loader.flatten_mapping(node)
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nodes = loader.construct_pairs(node)
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seen = {}
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for (key, _), (child_node, _) in zip(nodes, node.value):
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line = child_node.start_mark.line
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try:
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hash(key)
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except TypeError:
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fname = getattr(loader.stream, 'name', '')
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raise yaml.MarkedYAMLError(
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context="invalid key: \"{}\"".format(key),
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context_mark=yaml.Mark(fname, 0, line, -1, None, None)
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)
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if key in seen:
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fname = getattr(loader.stream, 'name', '')
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_LOGGER.error(
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u'YAML file %s contains duplicate key "%s". '
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u'Check lines %d and %d.', fname, key, seen[key], line)
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seen[key] = line
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return _add_reference(OrderedDict(nodes), loader, node)
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def _construct_seq(loader, node):
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"""Add line number and file name to Load YAML sequence."""
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obj, = loader.construct_yaml_seq(node)
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return _add_reference(obj, loader, node)
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def _add_reference(obj, loader, node):
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"""Add file reference information to an object."""
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if isinstance(obj, (str, unicode)):
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obj = NodeStrClass(obj)
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if isinstance(obj, list):
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return obj
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setattr(obj, '__config_file__', loader.name)
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setattr(obj, '__line__', node.start_mark.line)
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return obj
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yaml.SafeLoader.add_constructor(yaml.resolver.BaseResolver.DEFAULT_MAPPING_TAG, _ordered_dict)
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yaml.SafeLoader.add_constructor(yaml.resolver.BaseResolver.DEFAULT_SEQUENCE_TAG, _construct_seq)
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# From: https://gist.github.com/miracle2k/3184458
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# pylint: disable=redefined-outer-name
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def represent_odict(dump, tag, mapping, flow_style=None):
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"""Like BaseRepresenter.represent_mapping but does not issue the sort()."""
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value = []
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node = yaml.MappingNode(tag, value, flow_style=flow_style)
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if dump.alias_key is not None:
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dump.represented_objects[dump.alias_key] = node
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best_style = True
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if hasattr(mapping, 'items'):
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mapping = mapping.items()
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for item_key, item_value in mapping:
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node_key = dump.represent_data(item_key)
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node_value = dump.represent_data(item_value)
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if not (isinstance(node_key, yaml.ScalarNode) and not node_key.style):
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best_style = False
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if not (isinstance(node_value, yaml.ScalarNode) and
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not node_value.style):
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best_style = False
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value.append((node_key, node_value))
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if flow_style is None:
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if dump.default_flow_style is not None:
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node.flow_style = dump.default_flow_style
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else:
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node.flow_style = best_style
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return node
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def unicode_representer(dumper, uni):
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node = yaml.ScalarNode(tag=u'tag:yaml.org,2002:str', value=uni)
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return node
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def hex_int_representer(dumper, data):
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node = yaml.ScalarNode(tag=u'tag:yaml.org,2002:int', value=str(data))
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return node
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def ipaddress_representer(dumper, data):
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node = yaml.ScalarNode(tag=u'tag:yaml.org,2002:str', value=str(data))
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return node
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yaml.SafeDumper.add_representer(
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OrderedDict,
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lambda dumper, value:
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represent_odict(dumper, 'tag:yaml.org,2002:map', value)
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)
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yaml.SafeDumper.add_representer(
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NodeListClass,
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lambda dumper, value:
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dumper.represent_sequence(dumper, 'tag:yaml.org,2002:map', value)
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)
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yaml.SafeDumper.add_representer(unicode, unicode_representer)
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yaml.SafeDumper.add_representer(HexInt, hex_int_representer)
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yaml.SafeDumper.add_representer(IPAddress, ipaddress_representer)
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