o ^i@sFddlZddlmZddZddZd ddZd d d Zd d d ZdS)N)versioncCsz?|dkrt|t|kWS|dkrt|t|kWS|dkr.t|t|kWS|dkr=t|t|kWSWdStyIYdSw)a) Check version string of an active module against a required version. If dev/prerelease tags result in TypeError for string-number comparison, it is assumed that the dependency is satisfied. Users on dev branches are responsible for keeping their own packages up to date. >>===, > or < to specify the exact requirement Returns ------- out : bool True if `name` is installed matching the optional version. pythonNFTrz[0-9]zInvalid version numberr)rrrrzInvalid version condition '') lowersysrr ImportErrorresearchstartr)namerr r!matchsymbr r r is_installed$s$     r'csddlfdd}|S)a@Return decorator that forces a requirement for a function or class. Parameters ---------- name : str Name of module or "python". version : str, optional Version string to test against. If version is not None, checking version (must have an attribute named '__version__' or 'VERSION') Version may start with =, >=, > or < to specify the exact requirement Returns ------- func : function A decorator that raises an ImportError if a function is run in the absence of the input dependency. rNcsfdd}|S)NcsRtr |i|Sddjd}dur#|d7}t|d)N"z" in "z " requires " )r' __module__r )argskwargsmsg)r$objrr r func_wrappedfs  z0require..decorator..func_wrapped)wraps)r.r/ functoolsr$r)r.r decoratores zrequire..decorator)r2)r$rr3r r1r requireNs r4cCs&t||sdSt||ddgdS)a)Return a module object of name *module_name* if installed. Parameters ---------- module_name : str Name of module. version : str, optional Version string to test against. If version is not None, checking version (must have an attribute named '__version__' or 'VERSION') Version may start with =, >=, > or < to specify the exact requirement Returns ------- mod : module or None Module if *module_name* is installed matching the optional version or None otherwise. Nrrr)r'rr)rrr r r get_moduleus r5)N) r packagingrrrrr'r4r5r r r r s   *'