³ò 3ÒÇIc@sÝdZdZdddgZddkZddkZyeWn#ej oddklZnXd„Z dd „Z d „Z d „Z d „Zd „Zd„Zed„ƒZedjoddkZeiƒndS(s Decorator module by Michele Simionato Copyright Michele Simionato, distributed under the terms of the BSD License (see below). http://www.phyast.pitt.edu/~micheles/python/documentation.html Included in NLTK for its support of a nice memoization decorator. srestructuredtext ent decoratort new_wrappertgetinfoiÿÿÿÿN(tSetcCsøti|ƒpti|ƒpt‚ti|ƒ\}}}}t|ƒ}|o|i|ƒn|o|i|ƒnti||||dd„ƒdd!}td|i d|d|d|i d |i d |i d |i d |id |iƒ S(so Returns an info dictionary containing: - name (the name of the function : str) - argnames (the names of the arguments : list) - defaults (the values of the default arguments : tuple) - signature (the signature : str) - doc (the docstring : str) - module (the module name : str) - dict (the function __dict__ : str) >>> def f(self, x=1, y=2, *args, **kw): pass >>> info = getinfo(f) >>> info["name"] 'f' >>> info["argnames"] ['self', 'x', 'y', 'args', 'kw'] >>> info["defaults"] (1, 2) >>> info["signature"] 'self, x, y, *args, **kw' t formatvaluecSsdS(t((tvalue((s%/p/zhu/06/nlp/nltk/nltk/decorators.pyt:siiÿÿÿÿtnametargnamest signaturetdefaultstdoctmoduletdicttglobalstclosure(tinspecttismethodt isfunctiontAssertionErrort getargspectlisttappendt formatargspecRt__name__t func_defaultst__doc__t __module__t__dict__t func_globalst func_closure(tfunctregargstvarargst varkwargsR R R ((s%/p/zhu/06/nlp/nltk/nltk/decorators.pyRs' cCsv|p t|ƒ}y|d|_WnnX|d|_|d|_|ii|dƒ|d|_||_|S(NRR R RR (RRRRRtupdateRt undecorated(twrappertmodeltinfodict((s%/p/zhu/06/nlp/nltk/nltk/decorators.pytupdate_wrapperAs    cCsst|tƒo |}n t|ƒ}d|djp td‚d|}t|td|ƒƒ}t|||ƒS(sB An improvement over functools.update_wrapper. The wrapper is a generic callable object. It works by generating a copy of the wrapper with the right signature and by updating the copy, not the original. Moreovoer, 'model' can be a dictionary with keys 'name', 'doc', 'module', 'dict', 'defaults'. t _wrapper_R s("_wrapper_" is a reserved argument name!s.lambda %(signature)s: _wrapper_(%(signature)s)(t isinstanceRRRtevalR)(R&R'R(tsrctfuncopy((s%/p/zhu/06/nlp/nltk/nltk/decorators.pyRNs   cst‡‡fd†ˆƒS(Ncsˆiˆ||ŽS((tcall(tatk(tselfR (s%/p/zhu/06/nlp/nltk/nltk/decorators.pyRbs(R(R2R ((R2R s%/p/zhu/06/nlp/nltk/nltk/decorators.pyt__call__ascCsYtt|ƒƒ}d|jotdƒ‚nd|jotdƒ‚nt|_|S(sí Take a class with a ``.caller`` method and return a callable decorator object. It works by adding a suitable __call__ method to the class; it raises a TypeError if the class already has a nontrivial __call__ method. R3s=You cannot decorate a class with a nontrivial __call__ methodR/s2You cannot decorate a class without a .call method(tsettdirt TypeErrorR3(tclstattrs((s%/p/zhu/06/nlp/nltk/nltk/decorators.pytdecorator_factoryds   cs:tiˆƒotˆƒSn‡fd†}t|ˆƒS(sù General purpose decorator factory: takes a caller function as input and returns a decorator with the same attributes. A caller function is any function like this:: def caller(func, *args, **kw): # do something return func(*args, **kw) Here is an example of usage: >>> @decorator ... def chatty(f, *args, **kw): ... print "Calling %r" % f.__name__ ... return f(*args, **kw) >>> chatty.__name__ 'chatty' >>> @chatty ... def f(): pass ... >>> f() Calling 'f' decorator can also take in input a class with a .caller method; in this case it converts the class into a factory of callable decorator objects. See the documentation for an example. csst|ƒ}|d}d|jp d|j p td‚d|}t|td|dˆƒƒ}t|||ƒS(NR t_call_t_func_s2You cannot use _call_ or _func_ as argument names!s3lambda %(signature)s: _call_(_func_, %(signature)s)(RRR,RR)(R R(R R-tdec_func(tcaller(s%/p/zhu/06/nlp/nltk/nltk/decorators.pyt _decorator•s   (RtisclassR9R)(R=R>((R=s%/p/zhu/06/nlp/nltk/nltk/decorators.pyRus cCsHyt||ƒSWn0tj o$|ƒ}t|||ƒ|SnXdS(s'Similar to .setdefault in dictionaries.N(tgetattrtAttributeErrortsetattr(tobjRt default_thunktdefault((s%/p/zhu/06/nlp/nltk/nltk/decorators.pytgetattr_ s  cGsIt|dtƒ}||jo ||Sn||Œ}|||<|SdS(Nt memoize_dic(RFR(R targstdictresult((s%/p/zhu/06/nlp/nltk/nltk/decorators.pytmemoize©s     t__main__(Rt __docformat__t__all__RtsysR4t NameErrortsetsRRtNoneR)RR3R9RRFRKRtdoctestttestmod(((s%/p/zhu/06/nlp/nltk/nltk/decorators.pyss" )    +