esphome/esphomeyaml/yaml_util.py

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2018-04-07 01:23:03 +02:00
from __future__ import print_function
import codecs
import logging
from collections import OrderedDict
import yaml
from esphomeyaml.core import ESPHomeYAMLError, HexInt, IPAddress
_LOGGER = logging.getLogger(__name__)
class NodeListClass(list):
"""Wrapper class to be able to add attributes on a list."""
pass
class NodeStrClass(unicode):
"""Wrapper class to be able to add attributes on a string."""
pass
class SafeLineLoader(yaml.SafeLoader):
"""Loader class that keeps track of line numbers."""
def compose_node(self, parent, index):
"""Annotate a node with the first line it was seen."""
last_line = self.line # type: int
node = super(SafeLineLoader, self).compose_node(parent, index) # type: yaml.nodes.Node
node.__line__ = last_line + 1
return node
def load_yaml(fname):
"""Load a YAML file."""
try:
with codecs.open(fname, encoding='utf-8') as conf_file:
return yaml.load(conf_file, Loader=SafeLineLoader) or OrderedDict()
except yaml.YAMLError as exc:
_LOGGER.error(exc)
raise ESPHomeYAMLError(exc)
except UnicodeDecodeError as exc:
_LOGGER.error(u"Unable to read file %s: %s", fname, exc)
raise ESPHomeYAMLError(exc)
def dump(dict_):
"""Dump YAML to a string and remove null."""
return yaml.safe_dump(
dict_, default_flow_style=False, allow_unicode=True)
def _ordered_dict(loader, node):
"""Load YAML mappings into an ordered dictionary to preserve key order."""
loader.flatten_mapping(node)
nodes = loader.construct_pairs(node)
seen = {}
for (key, _), (child_node, _) in zip(nodes, node.value):
line = child_node.start_mark.line
try:
hash(key)
except TypeError:
fname = getattr(loader.stream, 'name', '')
raise yaml.MarkedYAMLError(
context="invalid key: \"{}\"".format(key),
context_mark=yaml.Mark(fname, 0, line, -1, None, None)
)
if key in seen:
fname = getattr(loader.stream, 'name', '')
_LOGGER.error(
u'YAML file %s contains duplicate key "%s". '
u'Check lines %d and %d.', fname, key, seen[key], line)
seen[key] = line
return _add_reference(OrderedDict(nodes), loader, node)
def _construct_seq(loader, node):
"""Add line number and file name to Load YAML sequence."""
obj, = loader.construct_yaml_seq(node)
return _add_reference(obj, loader, node)
def _add_reference(obj, loader, node):
"""Add file reference information to an object."""
if isinstance(obj, (str, unicode)):
obj = NodeStrClass(obj)
if isinstance(obj, list):
return obj
setattr(obj, '__config_file__', loader.name)
setattr(obj, '__line__', node.start_mark.line)
return obj
yaml.SafeLoader.add_constructor(yaml.resolver.BaseResolver.DEFAULT_MAPPING_TAG, _ordered_dict)
yaml.SafeLoader.add_constructor(yaml.resolver.BaseResolver.DEFAULT_SEQUENCE_TAG, _construct_seq)
# From: https://gist.github.com/miracle2k/3184458
# pylint: disable=redefined-outer-name
def represent_odict(dump, tag, mapping, flow_style=None):
"""Like BaseRepresenter.represent_mapping but does not issue the sort()."""
value = []
node = yaml.MappingNode(tag, value, flow_style=flow_style)
if dump.alias_key is not None:
dump.represented_objects[dump.alias_key] = node
best_style = True
if hasattr(mapping, 'items'):
mapping = mapping.items()
for item_key, item_value in mapping:
node_key = dump.represent_data(item_key)
node_value = dump.represent_data(item_value)
if not (isinstance(node_key, yaml.ScalarNode) and not node_key.style):
best_style = False
if not (isinstance(node_value, yaml.ScalarNode) and
not node_value.style):
best_style = False
value.append((node_key, node_value))
if flow_style is None:
if dump.default_flow_style is not None:
node.flow_style = dump.default_flow_style
else:
node.flow_style = best_style
return node
def unicode_representer(dumper, uni):
node = yaml.ScalarNode(tag=u'tag:yaml.org,2002:str', value=uni)
return node
def hex_int_representer(dumper, data):
node = yaml.ScalarNode(tag=u'tag:yaml.org,2002:int', value=str(data))
return node
def ipaddress_representer(dumper, data):
node = yaml.ScalarNode(tag=u'tag:yaml.org,2002:str', value=str(data))
return node
yaml.SafeDumper.add_representer(
OrderedDict,
lambda dumper, value:
represent_odict(dumper, 'tag:yaml.org,2002:map', value)
)
yaml.SafeDumper.add_representer(
NodeListClass,
lambda dumper, value:
dumper.represent_sequence(dumper, 'tag:yaml.org,2002:map', value)
)
yaml.SafeDumper.add_representer(unicode, unicode_representer)
yaml.SafeDumper.add_representer(HexInt, hex_int_representer)
yaml.SafeDumper.add_representer(IPAddress, ipaddress_representer)