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If it's added, any callbacks registered with the ``subscribe()`` method will be called. r+N) insert_onrylocationrzrrmr{ packagingutilscanonicalize_namer|r _added_new)rrrinsertr+keyskeys2normalized_names rKrzWorkingSet.adds$  NN4<<N @ =MME))%4**4=="=488t{{2  $ DHH#//;;DHHE=AXX))/: 884  KK ! 885 LL " rJcyrRrIr requirementsenv installerreplace_conflictingextrass rKrzWorkingSet.resolve)s #rJ)rrcyrRrIrs rKrzWorkingSet.resolve2s #rJcyrRrIrs rKrzWorkingSet.resolve<s!rJc *t|ddd}t}i}g}t} tjt tt ft} |r|jd} | |vr| j| |s+|j| ||||| |} | j| jddd} |j| | D]/}| |j| j| j| |<1|j| |r|S)aList all distributions needed to (recursively) meet `requirements` `requirements` must be a sequence of ``Requirement`` objects. `env`, if supplied, should be an ``Environment`` instance. 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N) rsortrryrmapras_requirementrrkdictfromkeysr)rrrrrplugin_projects error_info distributionsr shadow_setrrr resolveesr_sorted_distributionss rKrzWorkingSet.find_pluginss7Xz*46 >@  dll+C : CZ'C^^B'  S &'+ L"<0 **,- * 2 23Y GIZ^^Y78!((y)AB+  0 $M2!!##Z//)''(Jt$ sD  D+D&&D+cj|jt|}|D]}|j||S)aEnsure that distributions matching `requirements` are activated `requirements` must be a string or a (possibly-nested) sequence thereof, specifying the distributions and versions required. The return value is a sequence of the distributions that needed to be activated to fulfill the requirements; all relevant distributions are included, even if they were already activated in this working set. )rrr)rrneededrs rKrzWorkingSet.require!s90>? D HHTN  rJc|||jvry|jj||sy|D] }|| y)zInvoke `callback` for all distributions If `existing=True` (default), call on all existing ones, as well. 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" ! ' ! !!#'RV$))- H+H HP H " H ' H 3HT >  II%I8 I  I D II(,I  II%I 8 I  I DII(,+/ GG%G) G  G B GG(,RV X0X0%X0P X0  X0   X0t"LP8DH     "&rJrceZdZdZdddZy)rz> Map each requirement to the extras that demanded it. Ncxj xs+tfd|jd|xsdzDS)z Evaluate markers for req against each extra that demanded it. Return False if the req has a marker and fails evaluation. Otherwise, return True. c3XK|]!}jjd|i#yw)extraNmarkerevaluate)rrrs rKrz*_ReqExtras.markers_pass..ls-%  JJ  % 0 1% s'*rI)r)ranyr!)rrrs ` rKrz_ReqExtras.markers_passds@::~ % #r*fo>% "  rJrR)rr2rr)rErFrGrOrrIrJrKrr_s   rJr.c`eZdZdZdeef ddZddZddZdddZ ddZ ddZ e d dd Z e d dd Z d dd Z e dd Ze d dd Ze d d dZ d d!dZd"dZd#dZd#dZy)$rz5Searchable snapshot of distributions on a search pathNcPi|_||_||_|j|y)a!Snapshot distributions available on a search path Any distributions found on `search_path` are added to the environment. `search_path` should be a sequence of ``sys.path`` items. If not supplied, ``sys.path`` is used. `platform` is an optional string specifying the name of the platform that platform-specific distributions must be compatible with. If unspecified, it defaults to the current platform. `python` is an optional string naming the desired version of Python (e.g. ``'3.6'``); it defaults to the current version. You may explicitly set `platform` (and/or `python`) to ``None`` if you wish to map *all* distributions, not just those compatible with the running platform or Python version. N)_distmaprpythonscan)r search_pathrr s rKrzEnvironment.__init__us%,8:     +rJc|jduxs)|jduxs|j|jk(}|xr t|j|jS)zIs distribution `dist` acceptable for this environment? The distribution must match the platform and python version requirements specified when this environment was created, or False is returned. N)r  py_versionrr)rr py_compats rKcan_addzEnvironment.can_addsX KK4  .$& .$++-  O1$--OOrJcT|j|jj|y)z"Remove `dist` from the environmentN)rrmremovers rKrzEnvironment.removes dhh&&t,rJcx|tj}|D]#}t|D]}|j|%y)adScan `search_path` for distributions usable in this environment Any distributions found are added to the environment. `search_path` should be a sequence of ``sys.path`` items. If not supplied, ``sys.path`` is used. Only distributions conforming to the platform/python version defined at initialization are added. N)rrrr)rr rrs rKr zEnvironment.scansA  ((K D*40   rJcZ|j}|jj|gS)aReturn a newest-to-oldest list of distributions for `project_name` Uses case-insensitive `project_name` comparison, assuming all the project's distributions use their project's name converted to all lowercase as their key. )lowerrr!)rrdistribution_keys rK __getitem__zEnvironment.__getitem__s+(--/}}  !1266rJc|j|rt|jrc|jj|jg}||vr8|j ||j tjddyyyy)zCAdd `dist` if we ``can_add()`` it and it has not already been addedhashcmpT)rmreverseN) r has_versionrrrmrroperator attrgetter)rrrs rKrzEnvironment.addso << $"2"2"4MM,,TXXr:E5  T" x229=t L!#5 rJcyrRrIrrrrrs rKrzEnvironment.best_matchsrJcyrRrIrs rKrzEnvironment.best_matchs"rJc |j|}||S||jD] }||vs|cS|j||S#t$r|sd}YBwxYw)aFind distribution best matching `req` and usable on `working_set` This calls the ``find(req)`` method of the `working_set` to see if a suitable distribution is already active. 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