gemseo / core / grammars

base_grammar module

Base class for validating data structures.

class gemseo.core.grammars.base_grammar.BaseGrammar(name)

Bases: collections.abc.Mapping

An abstract base class for grammars with a dictionary-like interface.

A grammar considers a certain type of data defined by mandatory and optional names bound to types. A name-type pair is referred to as a grammar element. A grammar can validate a data from these elements.

Initialize self. See help(type(self)) for accurate signature.

Parameters

name (str) – The name of the grammar.

Raises

ValueError – If the name is empty.

Return type

None

add_namespace(name, namespace)

Add a namespace prefix to an existing grammar element.

The updated element name will be namespace``+:data:`~gemseo.core.namespaces.namespace_separator`+``name.

Parameters

• name (str) – The element name to rename.

• namespace (str) – The name of the namespace.

Return type

None

abstract clear()

Empty the grammar.

Return type

None

abstract convert_to_simple_grammar()

Convert the grammar to a SimpleGrammar.

Returns

A SimpleGrammar version of the current grammar.

Return type

SimpleGrammar

get(k[, d]) → D[k] if k in D, else d.  d defaults to None.

abstract is_array(name)

Check whether an element type shall be an array.

Parameters

name (str) – The name of the element.

Returns

Whether the element type shall be an array.

Raises

KeyError – If the element is not in the grammar.

Return type

bool

items() → a set-like object providing a view on D's items

keys() → a set-like object providing a view on D's keys

abstract rename_element(current_name, new_name)

Rename an element.

Parameters

• current_name (str) – The current name of the element.

• new_name (str) – The new name of the element.

Return type

None

abstract restrict_to(names)

Restrict the grammar to the given names.

Parameters

names (Sequence[str]) – The names of the elements to restrict the grammar to.

Raises

KeyError – If a name is not in the grammar.

Return type

None

abstract update(grammar, exclude_names=None)

Update the grammar.

Parameters

• grammar (BaseGrammar | Iterable[str]) – The grammar or names to update from.

• exclude_names (Container[str] | None) –

  The names of the elements that shall not be updated.

  By default it is set to None.

Return type

None

abstract update_from_data(data)

Update the grammar from name-value pairs.

Parameters

data (Mapping[str, Any]) – The data from which to get the names and types, typically {element_name: element_value}.

Raises

TypeError – If a value has a bad type.

Return type

None

abstract validate(data, raise_exception=True)

Validate data against the grammar.

Parameters

• data (Mapping[str, Any]) – The data to be checked, with a dictionary-like format: {element_name: element_value}.

• raise_exception (bool) –

  Whether to raise an exception when the validation fails.

  By default it is set to True.

Raises

InvalidDataException – If the validation fails and raise_exception is True.

Return type

None

values() → an object providing a view on D's values

from_namespaced: MutableMapping[str, Union[str, List[str]]]

The mapping from element names with namespace prefix to element names without namespace prefix.

name: str

The name of the grammar.

property names: KeysView[str]

The names of the elements.

abstract property required_names: set[str]

The names of the required elements.

to_namespaced: MutableMapping[str, Union[str, List[str]]]

The mapping from element names without namespace prefix to element names with namespace prefix.