U ’Ëáe1ã@s€ddlZddlZddlmZddlmZeddƒZee d¡ƒZ Gdd„dƒZ d d „Z dd d „Z dd d„Z ddd„Zdd„ZdS)éN)Ú namedtuple)ÚRECURSIVE_RELATIONSHIP_CONSTANTÚFieldReferencez to throughÚc@seZdZdd„Zdd„ZdS)Ú RegexObjectcCs|j|_|j|_dS©N)ÚpatternÚflags)ÚselfÚobj©r úP/var/www/html/htmlvenv/lib/python3.8/site-packages/django/db/migrations/utils.pyÚ__init__ szRegexObject.__init__cCs&t|tƒstS|j|jko$|j|jkSr)Ú isinstancerÚNotImplementedrr )r Úotherr r r Ú__eq__s zRegexObject.__eq__N)Ú__name__Ú __module__Ú __qualname__rrr r r r r srcCstj ¡ d¡S)Nz %Y%m%d_%H%M)ÚdatetimeÚnowÚstrftimer r r r Úget_migration_name_timestampsrcCs‚t|tƒrr|tkr2|dks"|dkr*tdƒ‚||fSd|krV| dd¡\}}|| ¡fS|dkrftdƒ‚|| ¡fS|jj|jjfS)z¾ Turn a model class or model reference string and return a model tuple. app_label and model_name are used to resolve the scope of recursive and unscoped model relationship. NzMapp_label and model_name must be provided to resolve recursive relationships.Ú.ézCapp_label must be provided to resolve unscoped model relationships.) rÚstrrÚ TypeErrorÚsplitÚlowerÚ_metaÚ app_labelÚ model_name)Úmodelr!r"r r r Úresolve_relations  ÿ ÿ r$c CsÊ|j}|sdSd}d}t|jf|žŽ|krlt|ddƒ}|dksd|dksdd|kr\|dksd|jsd||krl||f}t|ddƒ} | r´t| f|žŽ|kr´|j} |dks¬| dks¬|| kr´|| f}|sÀ|sÀdSt||ƒS)at Return either False or a FieldReference if `field` references provided context. False positives can be returned if `reference_field_name` is provided without `reference_field` because of the introspection limitation it incurs. This should not be an issue when this function is used to determine whether or not an optimization can take place. FNÚ to_fieldsÚthrough)Ú remote_fieldr$r#ÚgetattrZ primary_keyÚthrough_fieldsr) Ú model_tupleÚfieldZreference_model_tupleZreference_field_nameZreference_fieldr'Z references_toZreferences_throughr%r&r)r r r Úfield_references5sB ÿüø ÷ ÷ ó ÿüù r,r ccsP|j ¡D]@\}}|j ¡D],\}}t|||f|žŽ}|r||||fVqq dS)zÍ Generator of (model_state, name, field, reference) referencing provided context. If field_tuple is provided only references to this particular field of model_tuple will be generated. N)ÚmodelsÚitemsÚfieldsr,)Ústater*Ú field_tupleZstate_model_tupleZ model_stateÚnamer+Ú referencer r r Úget_referencesnsÿÿr4cCstt|||ƒdƒdk S)z?Return whether `field_tuple` is referenced by any state models.N)Únextr4)r0r*r1r r r Úfield_is_referencedsr6)NN)NN)r )rÚreÚ collectionsrZdjango.db.models.fields.relatedrrÚtypeÚcompileZCOMPILED_REGEX_TYPErrr$r,r4r6r r r r Ús     û 9