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esphome/esphome/yaml_util.py
Andrew Zaborowski c7c71089ce
codegen: Lambda improvements (#1476) 
* Use #line directives in generated C++ code for lambdas

The #line directive in gcc is meant specifically for pieces of imported
code included in generated code, exactly what happens with lambdas in
the yaml files: https://gcc.gnu.org/onlinedocs/cpp/Line-Control.html

With this change, if I add the following at line 165 of kithen.yaml:
    - lambda: undefined_var == 5;

then "$ esphome kitchen.yaml compile" shows the following:

INFO Reading configuration kitchen.yaml...
INFO Generating C++ source...
INFO Compiling app...
INFO Running:  platformio run -d kitchen
<...>
Compiling .pioenvs/kitchen/src/main.cpp.o
kitchen.yaml: In lambda function:
kitchen.yaml:165:7: error: 'undefined_var' was not declared in this scope
*** [.pioenvs/kitchen/src/main.cpp.o] Error 1
== [FAILED] Took 2.37 seconds ==

* Silence gcc warning on multiline macros in lambdas

When the \ is used at the end of the C++ source in a lambda (line
continuation, often used in preprocessor macros), esphome will copy that
into main.cpp once as code and once as a // commment.  gcc will complain
about the multiline commment:

Compiling .pioenvs/kitchen/src/main.cpp.o
kitchen.yaml:640:3: warning: multi-line comment [-Wcomment]

Try to replace the \ with a "<cont>" for lack of a better idea.
2021-01-23 20:17:15 -03:00

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import fnmatch
import functools
import inspect
import logging
import math
import os
import uuid
import yaml
import yaml.constructor
from esphome import core
from esphome.config_helpers import read_config_file
from esphome.core import EsphomeError, IPAddress, Lambda, MACAddress, TimePeriod, \
DocumentRange, DocumentLocation
from esphome.helpers import add_class_to_obj
from esphome.util import OrderedDict, filter_yaml_files
_LOGGER = logging.getLogger(__name__)
# Mostly copied from Home Assistant because that code works fine and
# let's not reinvent the wheel here
SECRET_YAML = 'secrets.yaml'
_SECRET_CACHE = {}
_SECRET_VALUES = {}
class ESPHomeDataBase:
@property
def esp_range(self):
return getattr(self, '_esp_range', None)
@property
def content_offset(self):
return getattr(self, '_content_offset', 0)
def from_node(self, node):
# pylint: disable=attribute-defined-outside-init
self._esp_range = DocumentRange.from_marks(node.start_mark, node.end_mark)
if isinstance(node, yaml.ScalarNode):
if node.style is not None and node.style in '|>':
self._content_offset = 1
class ESPForceValue:
pass
def make_data_base(value):
try:
return add_class_to_obj(value, ESPHomeDataBase)
except TypeError:
# Adding class failed, ignore error
return value
def _add_data_ref(fn):
@functools.wraps(fn)
def wrapped(loader, node):
res = fn(loader, node)
# newer PyYAML versions use generators, resolve them
if inspect.isgenerator(res):
generator = res
res = next(generator)
# Let generator finish
for _ in generator:
pass
res = make_data_base(res)
if isinstance(res, ESPHomeDataBase):
res.from_node(node)
return res
return wrapped
class ESPHomeLoader(yaml.SafeLoader): # pylint: disable=too-many-ancestors
"""Loader class that keeps track of line numbers."""
@_add_data_ref
def construct_yaml_int(self, node):
return super().construct_yaml_int(node)
@_add_data_ref
def construct_yaml_float(self, node):
return super().construct_yaml_float(node)
@_add_data_ref
def construct_yaml_binary(self, node):
return super().construct_yaml_binary(node)
@_add_data_ref
def construct_yaml_omap(self, node):
return super().construct_yaml_omap(node)
@_add_data_ref
def construct_yaml_str(self, node):
return super().construct_yaml_str(node)
@_add_data_ref
def construct_yaml_seq(self, node):
return super().construct_yaml_seq(node)
@_add_data_ref
def construct_yaml_map(self, node):
"""Traverses the given mapping node and returns a list of constructed key-value pairs."""
assert isinstance(node, yaml.MappingNode)
# A list of key-value pairs we find in the current mapping
pairs = []
# A list of key-value pairs we find while resolving merges ('<<' key), will be
# added to pairs in a second pass
merge_pairs = []
# A dict of seen keys so far, used to alert the user of duplicate keys and checking
# which keys to merge.
# Value of dict items is the start mark of the previous declaration.
seen_keys = {}
for key_node, value_node in node.value:
# merge key is '<<'
is_merge_key = key_node.tag == 'tag:yaml.org,2002:merge'
# key has no explicit tag set
is_default_tag = key_node.tag == 'tag:yaml.org,2002:value'
if is_default_tag:
# Default tag for mapping keys is string
key_node.tag = 'tag:yaml.org,2002:str'
if not is_merge_key:
# base case, this is a simple key-value pair
key = self.construct_object(key_node)
value = self.construct_object(value_node)
# Check if key is hashable
try:
hash(key)
except TypeError:
# pylint: disable=raise-missing-from
raise yaml.constructor.ConstructorError(
f'Invalid key "{key}" (not hashable)', key_node.start_mark)
# Check if it is a duplicate key
if key in seen_keys:
raise yaml.constructor.ConstructorError(
f'Duplicate key "{key}"', key_node.start_mark,
'NOTE: Previous declaration here:', seen_keys[key],
)
seen_keys[key] = key_node.start_mark
# Add to pairs
pairs.append((key, value))
continue
# This is a merge key, resolve value and add to merge_pairs
value = self.construct_object(value_node)
if isinstance(value, dict):
# base case, copy directly to merge_pairs
# direct merge, like "<<: {some_key: some_value}"
merge_pairs.extend(value.items())
elif isinstance(value, list):
# sequence merge, like "<<: [{some_key: some_value}, {other_key: some_value}]"
for item in value:
if not isinstance(item, dict):
raise yaml.constructor.ConstructorError(
"While constructing a mapping", node.start_mark,
"Expected a mapping for merging, but found {}".format(type(item)),
value_node.start_mark)
merge_pairs.extend(item.items())
else:
raise yaml.constructor.ConstructorError(
"While constructing a mapping", node.start_mark,
"Expected a mapping or list of mappings for merging, "
"but found {}".format(type(value)), value_node.start_mark)
if merge_pairs:
# We found some merge keys along the way, merge them into base pairs
# https://yaml.org/type/merge.html
# Construct a new merge set with values overridden by current mapping or earlier
# sequence entries removed
for key, value in merge_pairs:
if key in seen_keys:
# key already in the current map or from an earlier merge sequence entry,
# do not override
#
# "... each of its key/value pairs is inserted into the current mapping,
# unless the key already exists in it."
#
# "If the value associated with the merge key is a sequence, then this sequence
# is expected to contain mapping nodes and each of these nodes is merged in
# turn according to its order in the sequence. Keys in mapping nodes earlier
# in the sequence override keys specified in later mapping nodes."
continue
pairs.append((key, value))
# Add key node to seen keys, for sequence merge values.
seen_keys[key] = None
return OrderedDict(pairs)
@_add_data_ref
def construct_env_var(self, node):
args = node.value.split()
# Check for a default value
if len(args) > 1:
return os.getenv(args[0], ' '.join(args[1:]))
if args[0] in os.environ:
return os.environ[args[0]]
raise yaml.MarkedYAMLError(
f"Environment variable '{node.value}' not defined", node.start_mark
)
@property
def _directory(self):
return os.path.dirname(self.name)
def _rel_path(self, *args):
return os.path.join(self._directory, *args)
@_add_data_ref
def construct_secret(self, node):
secrets = _load_yaml_internal(self._rel_path(SECRET_YAML))
if node.value not in secrets:
raise yaml.MarkedYAMLError(
f"Secret '{node.value}' not defined", node.start_mark
)
val = secrets[node.value]
_SECRET_VALUES[str(val)] = node.value
return val
@_add_data_ref
def construct_include(self, node):
return _load_yaml_internal(self._rel_path(node.value))
@_add_data_ref
def construct_include_dir_list(self, node):
files = filter_yaml_files(_find_files(self._rel_path(node.value), '*.yaml'))
return [_load_yaml_internal(f) for f in files]
@_add_data_ref
def construct_include_dir_merge_list(self, node):
files = filter_yaml_files(_find_files(self._rel_path(node.value), '*.yaml'))
merged_list = []
for fname in files:
loaded_yaml = _load_yaml_internal(fname)
if isinstance(loaded_yaml, list):
merged_list.extend(loaded_yaml)
return merged_list
@_add_data_ref
def construct_include_dir_named(self, node):
files = filter_yaml_files(_find_files(self._rel_path(node.value), '*.yaml'))
mapping = OrderedDict()
for fname in files:
filename = os.path.splitext(os.path.basename(fname))[0]
mapping[filename] = _load_yaml_internal(fname)
return mapping
@_add_data_ref
def construct_include_dir_merge_named(self, node):
files = filter_yaml_files(_find_files(self._rel_path(node.value), '*.yaml'))
mapping = OrderedDict()
for fname in files:
loaded_yaml = _load_yaml_internal(fname)
if isinstance(loaded_yaml, dict):
mapping.update(loaded_yaml)
return mapping
@_add_data_ref
def construct_lambda(self, node):
start_mark = DocumentLocation.from_mark(node.start_mark)
if node.style is not None and node.style in '|>':
start_mark.line += 1
return Lambda(str(node.value), start_mark)
@_add_data_ref
def construct_force(self, node):
obj = self.construct_scalar(node)
return add_class_to_obj(obj, ESPForceValue)
ESPHomeLoader.add_constructor('tag:yaml.org,2002:int', ESPHomeLoader.construct_yaml_int)
ESPHomeLoader.add_constructor('tag:yaml.org,2002:float', ESPHomeLoader.construct_yaml_float)
ESPHomeLoader.add_constructor('tag:yaml.org,2002:binary', ESPHomeLoader.construct_yaml_binary)
ESPHomeLoader.add_constructor('tag:yaml.org,2002:omap', ESPHomeLoader.construct_yaml_omap)
ESPHomeLoader.add_constructor('tag:yaml.org,2002:str', ESPHomeLoader.construct_yaml_str)
ESPHomeLoader.add_constructor('tag:yaml.org,2002:seq', ESPHomeLoader.construct_yaml_seq)
ESPHomeLoader.add_constructor('tag:yaml.org,2002:map', ESPHomeLoader.construct_yaml_map)
ESPHomeLoader.add_constructor('!env_var', ESPHomeLoader.construct_env_var)
ESPHomeLoader.add_constructor('!secret', ESPHomeLoader.construct_secret)
ESPHomeLoader.add_constructor('!include', ESPHomeLoader.construct_include)
ESPHomeLoader.add_constructor('!include_dir_list', ESPHomeLoader.construct_include_dir_list)
ESPHomeLoader.add_constructor('!include_dir_merge_list',
ESPHomeLoader.construct_include_dir_merge_list)
ESPHomeLoader.add_constructor('!include_dir_named', ESPHomeLoader.construct_include_dir_named)
ESPHomeLoader.add_constructor('!include_dir_merge_named',
ESPHomeLoader.construct_include_dir_merge_named)
ESPHomeLoader.add_constructor('!lambda', ESPHomeLoader.construct_lambda)
ESPHomeLoader.add_constructor('!force', ESPHomeLoader.construct_force)
def load_yaml(fname):
_SECRET_VALUES.clear()
_SECRET_CACHE.clear()
return _load_yaml_internal(fname)
def _load_yaml_internal(fname):
content = read_config_file(fname)
loader = ESPHomeLoader(content)
loader.name = fname
try:
return loader.get_single_data() or OrderedDict()
except yaml.YAMLError as exc:
raise EsphomeError(exc) from exc
finally:
loader.dispose()
def dump(dict_):
"""Dump YAML to a string and remove null."""
return yaml.dump(dict_, default_flow_style=False, allow_unicode=True,
Dumper=ESPHomeDumper)
def _is_file_valid(name):
"""Decide if a file is valid."""
return not name.startswith('.')
def _find_files(directory, pattern):
"""Recursively load files in a directory."""
for root, dirs, files in os.walk(directory, topdown=True):
dirs[:] = [d for d in dirs if _is_file_valid(d)]
for basename in files:
if _is_file_valid(basename) and fnmatch.fnmatch(basename, pattern):
filename = os.path.join(root, basename)
yield filename
def is_secret(value):
try:
return _SECRET_VALUES[str(value)]
except (KeyError, ValueError):
return None
class ESPHomeDumper(yaml.SafeDumper): # pylint: disable=too-many-ancestors
def represent_mapping(self, tag, mapping, flow_style=None):
value = []
node = yaml.MappingNode(tag, value, flow_style=flow_style)
if self.alias_key is not None:
self.represented_objects[self.alias_key] = node
best_style = True
if hasattr(mapping, 'items'):
mapping = list(mapping.items())
for item_key, item_value in mapping:
node_key = self.represent_data(item_key)
node_value = self.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 self.default_flow_style is not None:
node.flow_style = self.default_flow_style
else:
node.flow_style = best_style
return node
def represent_secret(self, value):
return self.represent_scalar(tag='!secret', value=_SECRET_VALUES[str(value)])
def represent_stringify(self, value):
if is_secret(value):
return self.represent_secret(value)
return self.represent_scalar(tag='tag:yaml.org,2002:str', value=str(value))
# pylint: disable=arguments-differ
def represent_bool(self, value):
return self.represent_scalar('tag:yaml.org,2002:bool', 'true' if value else 'false')
def represent_int(self, value):
if is_secret(value):
return self.represent_secret(value)
return self.represent_scalar(tag='tag:yaml.org,2002:int', value=str(value))
def represent_float(self, value):
if is_secret(value):
return self.represent_secret(value)
if math.isnan(value):
value = '.nan'
elif math.isinf(value):
value = '.inf' if value > 0 else '-.inf'
else:
value = str(repr(value)).lower()
# Note that in some cases `repr(data)` represents a float number
# without the decimal parts. For instance:
# >>> repr(1e17)
# '1e17'
# Unfortunately, this is not a valid float representation according
# to the definition of the `!!float` tag. We fix this by adding
# '.0' before the 'e' symbol.
if '.' not in value and 'e' in value:
value = value.replace('e', '.0e', 1)
return self.represent_scalar(tag='tag:yaml.org,2002:float', value=value)
def represent_lambda(self, value):
if is_secret(value.value):
return self.represent_secret(value.value)
return self.represent_scalar(tag='!lambda', value=value.value, style='|')
def represent_id(self, value):
if is_secret(value.id):
return self.represent_secret(value.id)
return self.represent_stringify(value.id)
ESPHomeDumper.add_multi_representer(
dict,
lambda dumper, value: dumper.represent_mapping('tag:yaml.org,2002:map', value)
)
ESPHomeDumper.add_multi_representer(
list,
lambda dumper, value: dumper.represent_sequence('tag:yaml.org,2002:seq', value)
)
ESPHomeDumper.add_multi_representer(bool, ESPHomeDumper.represent_bool)
ESPHomeDumper.add_multi_representer(str, ESPHomeDumper.represent_stringify)
ESPHomeDumper.add_multi_representer(int, ESPHomeDumper.represent_int)
ESPHomeDumper.add_multi_representer(float, ESPHomeDumper.represent_float)
ESPHomeDumper.add_multi_representer(IPAddress, ESPHomeDumper.represent_stringify)
ESPHomeDumper.add_multi_representer(MACAddress, ESPHomeDumper.represent_stringify)
ESPHomeDumper.add_multi_representer(TimePeriod, ESPHomeDumper.represent_stringify)
ESPHomeDumper.add_multi_representer(Lambda, ESPHomeDumper.represent_lambda)
ESPHomeDumper.add_multi_representer(core.ID, ESPHomeDumper.represent_id)
ESPHomeDumper.add_multi_representer(uuid.UUID, ESPHomeDumper.represent_stringify)
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