gemseo / core / grammars

simple_grammar module

Most basic grammar implementation.

class gemseo.core.grammars.simple_grammar.SimpleGrammar(name, names_to_types=None, required_names=None, **kwargs)[source]

Bases: BaseGrammar

A grammar only based on names and types with a dictionary-like interface.

The grammar could be empty, in that case the data validation always pass. If the type bound to a name is None then the type of the corresponding data name is always valid.

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

Parameters:
  • name (str) – The name of the grammar.

  • names_to_types (NamesToTypes | None) – The mapping defining the data names as keys, and data types as values. If None, the grammar is empty.

  • required_names (Iterable[str] | None) – The names of the required elements. If None, all elements are required.

  • **kwargs (Any) – These arguments are not used.

Raises:

ValueError – If the name is empty.

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

clear()[source]

Empty the grammar.

Return type:

None

convert_to_simple_grammar()[source]

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.
is_array(name)[source]

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
rename_element(current_name, new_name)[source]

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

restrict_to(names)[source]

Restrict the grammar to the given names.

Parameters:

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

Raises:

KeyError – If a name is not in the grammar.

Return type:

None

update(grammar, exclude_names=None)[source]

Update the elements from another grammar or elements or names.

When elements are not provided with a BaseGrammar, for consistency with __init__ behavior it is assumed that all of them are required.

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

  • exclude_names (Container[str] | None) – The names of the elements that shall not be updated.

Raises:
  • TypeError – If grammar type is not supported.

  • ValueError – If the elements types are bad.

Return type:

None

update_from_data(data)[source]

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

validate(data, raise_exception=True)[source]

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: NamespacesMapping

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.

property required_names: set[str]

The names of the required elements.

to_namespaced: NamespacesMapping

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