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from collections import OrderedDict |
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from copy import copy |
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from inspect import getfullargspec, ismethod |
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from coalib.settings.DocumentationComment import DocumentationComment |
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class FunctionMetadata: |
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str_nodesc = "No description given." |
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str_optional = "Optional, defaults to '{}'." |
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def __init__(self, |
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name, |
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desc="", |
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retval_desc="", |
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non_optional_params=None, |
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optional_params=None, |
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omit=frozenset()): |
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""" |
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Creates the FunctionMetadata object. |
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:param name: The name of the function. |
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:param desc: The description of the function. |
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:param retval_desc: The retval description of the function. |
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:param non_optional_params: A dict containing the name of non optional |
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parameters as the key and a tuple of a |
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description and the python annotation. To |
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preserve the order, use OrderedDict. |
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:param optional_params: A dict containing the name of optional |
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parameters as the key and a tuple |
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of a description, the python annotation and |
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the default value. To preserve the order, |
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use OrderedDict. |
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:param omit: A set of parameters to omit. |
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""" |
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if non_optional_params is None: |
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non_optional_params = OrderedDict() |
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if optional_params is None: |
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optional_params = OrderedDict() |
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self.name = name |
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self.desc = desc |
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self.retval_desc = retval_desc |
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self._non_optional_params = non_optional_params |
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self._optional_params = optional_params |
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self.omit = set(omit) |
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def _filter_out_omitted(self, params): |
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""" |
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Filters out parameters that are to omit. This is a helper method for |
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the param related properties. |
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:param params: The parameter dictionary to filter. |
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:return: The filtered dictionary. |
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""" |
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return OrderedDict(filter(lambda p: p[0] not in self.omit, |
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tuple(params.items()))) |
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@property |
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def non_optional_params(self): |
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""" |
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Retrieves a dict containing the name of non optional parameters as the |
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key and a tuple of a description and the python annotation. Values that |
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are present in self.omit will be omitted. |
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""" |
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return self._filter_out_omitted(self._non_optional_params) |
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@property |
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def optional_params(self): |
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""" |
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Retrieves a dict containing the name of optional parameters as the key |
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and a tuple of a description, the python annotation and the default |
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value. Values that are present in self.omit will be omitted. |
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""" |
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return self._filter_out_omitted(self._optional_params) |
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def create_params_from_section(self, section): |
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""" |
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Create a params dictionary for this function that holds all values the |
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function needs plus optional ones that are available. |
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:param section: The section to retrieve the values from. |
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:return: The params dictionary. |
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""" |
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params = {} |
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for param in self.non_optional_params: |
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_, annotation = self.non_optional_params[param] |
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params[param] = self._get_param(param, section, annotation) |
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for param in self.optional_params: |
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if param in section: |
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_, annotation, _ = self.optional_params[param] |
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params[param] = self._get_param(param, section, annotation) |
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return params |
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@staticmethod |
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def _get_param(param, section, annotation): |
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if annotation is None: |
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annotation = lambda x: x |
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try: |
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return annotation(section[param]) |
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except (TypeError, ValueError): |
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raise ValueError("Unable to convert parameter {} into type " |
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"{}.".format(repr(param), annotation)) |
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@classmethod |
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def from_function(cls, func, omit=frozenset()): |
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""" |
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Creates a FunctionMetadata object from a function. Please note that any |
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variable argument lists are not supported. If you do not want the |
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first (usual named 'self') argument to appear please pass the method of |
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an actual INSTANCE of a class; passing the method of the class isn't |
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enough. Alternatively you can add "self" to the omit set. |
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:param func: The function. If __metadata__ of the unbound function is |
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present it will be copied and used, otherwise it will be |
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generated. |
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:param omit: A set of parameter names that are to be ignored. |
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:return: The FunctionMetadata object corresponding to the given |
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function. |
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""" |
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if hasattr(func, "__metadata__"): |
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metadata = copy(func.__metadata__) |
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metadata.omit = omit |
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return metadata |
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doc = func.__doc__ or "" |
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doc_comment = DocumentationComment.from_docstring(doc) |
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non_optional_params = OrderedDict() |
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optional_params = OrderedDict() |
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argspec = getfullargspec(func) |
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args = argspec.args or () |
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defaults = argspec.defaults or () |
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num_non_defaults = len(args) - len(defaults) |
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for i, arg in enumerate(args): |
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# Implicit self argument or omitted explicitly |
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if i < 1 and ismethod(func): |
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continue |
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if i < num_non_defaults: |
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non_optional_params[arg] = ( |
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doc_comment.param_dict.get(arg, cls.str_nodesc), |
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argspec.annotations.get(arg, None)) |
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else: |
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optional_params[arg] = ( |
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doc_comment.param_dict.get(arg, cls.str_nodesc) + " (" + |
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cls.str_optional.format( |
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str(defaults[i-num_non_defaults])) + ")", |
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argspec.annotations.get(arg, None), |
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defaults[i-num_non_defaults]) |
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return cls(name=func.__name__, |
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desc=doc_comment.desc, |
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retval_desc=doc_comment.retval_desc, |
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non_optional_params=non_optional_params, |
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optional_params=optional_params, |
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omit=omit) |
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def filter_parameters(self, dct): |
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""" |
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Filters the given dict for keys that are declared as parameters inside |
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this metadata (either optional or non-optional). |
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:param dct: |
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The dict to filter. |
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:return: |
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A new dict containing the filtered items. |
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""" |
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return {key: dct[key] |
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for key in self.non_optional_params.keys() | |
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self.optional_params.keys() |
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if key in dct} |
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@classmethod |
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def merge(cls, *metadatas): |
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""" |
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Merges signatures of ``FunctionMetadata`` objects. |
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Parameter (either optional or non-optional) and non-parameter |
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descriptions are merged from left to right, meaning the right hand |
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metadata overrides the left hand one. |
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:param metadatas: |
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The sequence of metadatas to merge. |
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:raises ValueError: |
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Raised when less than 2 metadatas are provided. |
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:return: |
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A ``FunctionMetadata`` object containing the merged signature of |
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all given metadatas. |
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""" |
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# Collect the metadatas, as we operate on them more often and we want |
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# to support arbitrary sequences. |
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metadatas = tuple(metadatas) |
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if len(metadatas) < 2: |
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raise ValueError("Less than 2 metadata objects provided.") |
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merged_name = ("<Merged signature of " + |
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", ".join(repr(metadata.name) |
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for metadata in metadatas) + |
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">") |
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merged_desc = metadatas[-1].desc |
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merged_retval_desc = metadatas[-1].retval_desc |
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merged_non_optional_params = {} |
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merged_optional_params = {} |
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for metadata in metadatas: |
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merged_non_optional_params.update(metadata.non_optional_params) |
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merged_optional_params.update(metadata.optional_params) |
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merged_omit = set.union(*(metadata.omit for metadata in metadatas)) |
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return cls(merged_name, |
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merged_desc, |
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merged_retval_desc, |
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merged_non_optional_params, |
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merged_optional_params, |
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merged_omit) |
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coala-analyzer /
coala
