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Sometimes called "memoize".N)r)r )rs r)rrs "9T "= 11r,cg} |Dcgc]}|s| }}|s|S|D]}|d}|D] }||ddvs d}n td|j||D]}|d|k(s |d=gcc}w)zMerges MROs in *sequences* to a single MRO using the C3 algorithm. Adapted from https://www.python.org/download/releases/2.3/mro/. rrNzInconsistent hierarchy) RuntimeErrorappend) sequencesrss1 candidates2seqs r) _c3_merger's F  )/1QQ/ /M B1I 12& $I     78 8 i  C1v"F ! /s A+A+Nctt|jD]+\}tdst |j|z }nd}|r t |ng}t |jd|}g}t |j|d}|D]?t |stfd|jDr/|jA|D]|j|Dcgc]}t||}}|Dcgc]}t||} }|Dcgc]}t||} }t|gg|z| z| z|gz|gz|gzScc}wcc}wcc}w)aComputes the method resolution order using extended C3 linearization. If no *abcs* are given, the algorithm works exactly like the built-in C3 linearization used for method resolution. If given, *abcs* is a list of abstract base classes that should be inserted into the resulting MRO. Unrelated ABCs are ignored and don't end up in the result. 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If two implicit ABCs end up next to each other in the resulting MRO, their ordering depends on the order of types in *abcs*. __abstractmethods__rNc36K|]}t|ywrh) issubclass)rbbases r)rz_c3_mro..s-() 1d#-sabcs) enumeratereversed __bases__rrlistr+anyr remove_c3_mror') r]r/iboundaryexplicit_basesabstract_bases other_basesr-explicit_c3_mrosabstract_c3_mros other_c3_mross ` r)r6r6s"Xcmm454 4. /3==)A-H  4:2D#-- 23NNs}}XY/0K( c4 --0]]-*  ! !$ ' ( D=KLT40LL=KLT40LL:EF$WT-FMF   + ,.; <  *+ ,/:m < MLFs1E E"%E'c X tj fd}Dcgc] }||s |c}fd}Dcgc] }||r |c}t}g}D]}g}|jD]B} | vst| s|j | jD cgc] } | |vs|  c} D|s|j |n|j t d|D]} | D]} | |vs|j | !t|Scc}wcc}wcc} w)zCalculates the method resolution order for a given class *cls*. Includes relevant abstract base classes (with their respective bases) from the *types* iterable. Uses a modified C3 linearization algorithm. cj|vxr-t|dxrt|t xr t|S)N__mro__)rrrr+)typbasesr]s r) is_relatedz _compose_mro..is_relateds?5 :WS)%<:)3C)F%F:%/S%9 ;r,c@D]}||k7s ||jvsyy)NTF)rA)rBr4typess r)is_strict_basez$_compose_mro..is_strict_bases, Ee|u}} 4 r,T)rreverser.)setrA__subclasses__r+r sortrr6) r]rFrDnrGtype_setmrorBfoundsubr"subclsrCs `` @r) _compose_mrorRs2  E; /1AQ /E  71^A%6Q 7E5zH C '%%' HC%JsC$8 FAX aFG H JJsO  sD ) 'C '$JJv& ' ' ' 3S !!7 0 8Gs" DD D"D"( D' 2D' ct||j}d}|D]T}|I||vrC||jvr5||jvr't||st dj ||n ||vsS|}V|j |S)a^Returns the best matching implementation from *registry* for type *cls*. Where there is no registered implementation for a specific type, its method resolution order is used to find a more generic implementation. Note: if *registry* does not contain an implementation for the base *object* type, this function may return None. NzAmbiguous dispatch: {} or {})rRkeysrAr+rrr)r]registryrNmatchts r) _find_implrXs sHMMO ,C E    X !3;;"6"'s{{":&0&:"#A#H#H1$  =E  << r,cB ddl ddl}i |jd fd fdfdd  fd fd}t|dd | t< |_|_ j |_j|_ t|||S) akSingle-dispatch generic function decorator. Transforms a function into a generic function, which can have different behaviours depending upon the type of its first argument. The decorated function acts as the default implementation, and additional implementations can be registered using the register() attribute of the generic function. rNc!t}|k7rj| |}|S#t$r+ |}n#t$rt|}YnwxYw||<Y|SwxYw)zgeneric_func.dispatch(cls) -> Runs the dispatch algorithm to return the best available implementation for the given *cls* registered on *generic_func*. )rrKeyErrorrX)r] current_tokenimpl cache_tokendispatch_cacherUs r)dispatchz singledispatch..dispatch2s  "+-Mm+$$&+  '!#&D  ' 1} 1!#x0 1"&N3   's/- A!=A!AA!AA! A!c@ddlm}m}|||jhvS)Nr) get_originUnion)typingrbrc UnionType)r]rbrcrFs r)_is_union_typez&singledispatch.._is_union_typeIs,#5%//":::r,cvt|tryddlm}|xrt d||DS)NTrget_argsc3<K|]}t|tywrh)rr/)rargs r)rzBsingledispatch.._is_valid_dispatch_type..RsCcJsD)Cs)rr/rdriall)r]rirfs r)_is_valid_dispatch_typez/singledispatch.._is_valid_dispatch_typeMs9 c4 #s#DCXc]CC Er,cr| fdS|tddtdi}|stdd}ddlm}t t ||j \}s,rtd |d d td |d d rdd lm}|D]}| |< n| < tdr t j|S)zgeneric_func.register(cls, func) -> func Registers a new implementation for the given *cls* on a *generic_func*. c|Srhr)fr]registers r)rz2singledispatch..register..]s#q!1r,z(Invalid first argument to `register()`. z is not a class or union type.rz(Invalid first argument to `register()`: zS. Use either `@register(some_class)` or plain `@register` on an annotated function.r)get_type_hintszInvalid annotation for z. z not all arguments are classes.z is not a class.rhr)) r~rrdrrr|rzrrirrr) r]rannrrargnamerirkrfrmr^r_rqrUs ` r)rqz singledispatch..registerTsQ #3 '|11>g;=#0"5C>sgF01 D .^D%9%?%?%A BCLGS*3/!#&#1'B'!@B $1'B'!13 #  '} % $  %!HSM  730E#F)+K r,cZ|std|dj|i|S)Nz( requires at least 1 positional argumentr)r~r)rkwr`funcnames r)r#zsingledispatch..wrappersDxj)445 5+xQ))*D7B77r,rzsingledispatch functionrh) rFweakrefWeakKeyDictionaryrrZrqr`MappingProxyTyperUr _clear_cacher) rrxr#rfrmr^r`r_rwrqrUrFs @@@@@@@@@r)r r sH..0NK.;E22h8tZ)BCHHVGG--h7G)//G7D! Nr,c6eZdZdZdZddZddZedZy)rzSingle-dispatch generic method descriptor. Supports wrapping existing descriptors and handles non-descriptor callables as instance methods. c|t|st|dst|dt||_||_y)Nrz is not callable or a descriptor)rrr~r dispatcherrr3rs r)rjzsingledispatchmethod.__init__s8~gdI&>th&FGH H(. r,Nc<|jj||S)zgeneric_method.register(cls, func) -> func Registers a new implementation for the given *cls* on a *generic_method*. r)r~rq)r3r]methods r)rqzsingledispatchmethod.registers ''&'99r,cfd}j|_j|_t|j|S)Ncjj|dj}|j|i|Srl)r~r`rr)rkwargsrr]rfr3s r)rz-singledispatchmethod.__get__.._methods>__--d1g.?.?@F+6>>#s+T3J3J2MNDDHMMCTT^` n$.  /s A6#B56rs:   ""=2,>)# 70+&*'+&*'+&+&+&(+&+&+&(+&+&+&(+&+&+&(  $ & %8'78 !??B " E2FE2T %N O "  st>,\rh -26+Z("T4vt!A!APX *2*2C  P  X  X   sH D'D2/D=2E'D/.D/2D:9D:=EEEE