B Uvg 5@sdZddlZddlmZddlmZddlmZmZm Z m Z m Z ddl m Z ddlmZddlmZmZdd lmZeeZGd d d eZdS) ayDependency Resolution The dependency resolution in pip is performed as follows: for top-level requirements: a. only one spec allowed per project, regardless of conflicts or not. otherwise a "double requirement" exception is raised b. they override sub-dependency requirements. for sub-dependencies a. "first found, wins" (where the order is breadth first) N) defaultdict)chain)BestVersionAlreadyInstalledDistributionNotFound HashError HashErrorsUnsupportedPythonVersion)install_req_from_req) indent_log)dist_in_usersite ensure_dir)check_dist_requires_pythoncsbeZdZdZdddhZfddZddZd d Zd d Zd dZ ddZ ddZ ddZ Z S)ResolverzResolves which packages need to be installed/uninstalled to perform the requested operation without breaking the requirements of any package. eagerzonly-if-neededzto-satisfy-onlyc srtt|| |jkst||_||_||_||_d|_ | |_ | |_ | |_ ||_ ||_||_||_tt|_dS)N)superr__init___allowed_strategiesAssertionErrorpreparerfindersession wheel_cacherequire_hashesupgrade_strategyforce_reinstallisolatedignore_dependenciesignore_installedignore_requires_python use_user_siterlist_discovered_dependencies) selfrrrrrrrrrrr) __class__6/tmp/pip-install-r_9ig3yj/pip/pip/_internal/resolve.pyr$szResolver.__init__c Cs|jjrt|jj|jt|j}|jp>tdd|D|_|j }|rZt |g}t }x\t||D]N}y||||Wqptk r}z||_||Wdd}~XYqpXqpW|r|dS)aResolve what operations need to be done As a side-effect of this method, the packages (and their dependencies) are downloaded, unpacked and prepared for installation. 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Nzonly-if-neededz#already satisfied, skipping upgradezalready satisfiedT)upgradezalready up-to-date) rcheck_if_existsrr>rr@r=rlinkrfind_requirementrr)r"req_to_installr$r$r%_check_skip_installeds*     zResolver._check_skip_installedcCs|jdk std|jr0|j||j|j|jS|jdks>t||}|jr`|j ||j|S| |}|j ||j |j||j}|j s||j|jr|jdkp|jp|j p|jjdk}|r||n td||S)zzTakes a InstallRequirement and returns a single AbstractDist representing a prepared variant of the same. 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We break cycles at an arbitrary point, and make no other guarantees. csR|js|krdS|jrdS|xj|jD] }|q4W|dS)N)r>r^addr!rUr4)r(dep)order ordered_reqsscheduler"r$r%rtUs  z1Resolver.get_installation_order..schedule)rir,r-)r"req_set install_reqr$)rrrsrtr"r%get_installation_orderHs   zResolver.get_installation_order)__name__ __module__ __qualname____doc__rrr;r=r@rFrQr3rw __classcell__r$r$)r#r%rs  1  49Xr)r{logging collectionsr itertoolsrpip._internal.exceptionsrrrrrpip._internal.req.constructorsr pip._internal.utils.loggingr pip._internal.utils.miscr r pip._internal.utils.packagingr getLoggerrxr0objectrr$r$r$r% s