i<ddlZddlmZdZdZddZddZddZy) N)versionc |dk(r+tj|tj|kDS|dk(r+tj|tj|k\S|dk(r+tj|tj|k(S|dk(r+tj|tj|kSy#t$rYywxYw)a) Check version string of an active module against a required version. If dev/prerelease tags result in TypeError for string-number comparison, it is assumed that the dependency is satisfied. Users on dev branches are responsible for keeping their own packages up to date. >>==>&)HNN7,CC C t^>>&)X^^G-DD D s]>>&)X^^G-DD D s]>>&)HNN7,CC C s"/C/C"/C/C CCc rt||jddg}t|dt|ddS)z=, > or < to specify the exact requirement Returns ------- out : bool True if `name` is installed matching the optional version. pythonNFTrz[0-9]zInvalid version numberr)rrrrzInvalid version condition '') lowersysrr ImportErrorresearchstartr)namerr r%matchsymbs r is_installedr+$s$ zz|xRa '-F  '7+ :":: 'D,,S0KD6QR.SS,%++-/*fgt44!  s B B('B(c"ddlfd}|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. rNc@jfd}|S)Nctr|i|Sddjd}|dz }t|dz)N"z" in "z " requires " )r+ __module__r$)argskwargsmsgr(objrs r func_wrappedz0require..decorator..func_wrappedfs_D'*D+F++#fS^^$4LG&Qwi=(C!#),,r)wraps)r5r6 functoolsr(rs` r decoratorzrequire..decoratores&   -  -r)r8)r(rr9r8s`` @rrequirer:Ns*  rc\t||syt||jddgS)a)Return a module object of name *module_name* if installed. Parameters ---------- module_name : str Name of module. version : str, optional Version string to test against. If version is not None, checking version (must have an attribute named '__version__' or 'VERSION') Version may start with =, >=, > or < to specify the exact requirement Returns ------- mod : module or None Module if *module_name* is installed matching the optional version or None otherwise. Nrrr)r+rr)rrs r get_moduler<us1&  W - k[-C-CC-H-L,M NNr)N) r# packagingrr rrr+r:r<rrr?s( )0F '5T$NOr