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| 1 # -*- test-case-name: twisted.test.test_reflect -*- | |
| 2 | |
| 3 # Copyright (c) 2001-2004 Twisted Matrix Laboratories. | |
| 4 # See LICENSE for details. | |
| 5 | |
| 6 | |
| 7 """ | |
| 8 Standardized versions of various cool and/or strange things that you can do | |
| 9 with Python's reflection capabilities. | |
| 10 """ | |
| 11 | |
| 12 from __future__ import nested_scopes | |
| 13 | |
| 14 | |
| 15 # System Imports | |
| 16 import sys | |
| 17 import os | |
| 18 import types | |
| 19 import string | |
| 20 import pickle | |
| 21 import new | |
| 22 import traceback | |
| 23 import weakref | |
| 24 import re | |
| 25 import warnings | |
| 26 try: | |
| 27 from collections import deque | |
| 28 except ImportError: | |
| 29 deque = list | |
| 30 | |
| 31 RegexType = type(re.compile("")) | |
| 32 | |
| 33 | |
| 34 try: | |
| 35 import cStringIO as StringIO | |
| 36 except ImportError: | |
| 37 import StringIO | |
| 38 | |
| 39 class Settable: | |
| 40 """ | |
| 41 A mixin class for syntactic sugar. Lets you assign attributes by | |
| 42 calling with keyword arguments; for example, C{x(a=b,c=d,y=z)} is the | |
| 43 same as C{x.a=b;x.c=d;x.y=z}. The most useful place for this is | |
| 44 where you don't want to name a variable, but you do want to set | |
| 45 some attributes; for example, C{X()(y=z,a=b)}. | |
| 46 """ | |
| 47 def __init__(self, **kw): | |
| 48 self(**kw) | |
| 49 | |
| 50 def __call__(self,**kw): | |
| 51 for key,val in kw.items(): | |
| 52 setattr(self,key,val) | |
| 53 return self | |
| 54 | |
| 55 | |
| 56 class AccessorType(type): | |
| 57 """Metaclass that generates properties automatically. | |
| 58 | |
| 59 This is for Python 2.2 and up. | |
| 60 | |
| 61 Using this metaclass for your class will give you explicit accessor | |
| 62 methods; a method called set_foo, will automatically create a property | |
| 63 'foo' that uses set_foo as a setter method. Same for get_foo and del_foo. | |
| 64 | |
| 65 Note that this will only work on methods that are present on class | |
| 66 creation. If you add methods after the class is defined they will not | |
| 67 automatically become properties. Likewise, class attributes will only | |
| 68 be used if they are present upon class creation, and no getter function | |
| 69 was set - if a getter is present, the class attribute will be ignored. | |
| 70 | |
| 71 This is a 2.2-only alternative to the Accessor mixin - just set in your | |
| 72 class definition:: | |
| 73 | |
| 74 __metaclass__ = AccessorType | |
| 75 | |
| 76 """ | |
| 77 | |
| 78 def __init__(self, name, bases, d): | |
| 79 type.__init__(self, name, bases, d) | |
| 80 accessors = {} | |
| 81 prefixs = ["get_", "set_", "del_"] | |
| 82 for k in d.keys(): | |
| 83 v = getattr(self, k) | |
| 84 for i in range(3): | |
| 85 if k.startswith(prefixs[i]): | |
| 86 accessors.setdefault(k[4:], [None, None, None])[i] = v | |
| 87 for name, (getter, setter, deler) in accessors.items(): | |
| 88 # create default behaviours for the property - if we leave | |
| 89 # the getter as None we won't be able to getattr, etc.. | |
| 90 if getter is None: | |
| 91 if hasattr(self, name): | |
| 92 value = getattr(self, name) | |
| 93 def getter(this, value=value, name=name): | |
| 94 if this.__dict__.has_key(name): | |
| 95 return this.__dict__[name] | |
| 96 else: | |
| 97 return value | |
| 98 else: | |
| 99 def getter(this, name=name): | |
| 100 if this.__dict__.has_key(name): | |
| 101 return this.__dict__[name] | |
| 102 else: | |
| 103 raise AttributeError, "no such attribute %r" % name | |
| 104 if setter is None: | |
| 105 def setter(this, value, name=name): | |
| 106 this.__dict__[name] = value | |
| 107 if deler is None: | |
| 108 def deler(this, name=name): | |
| 109 del this.__dict__[name] | |
| 110 setattr(self, name, property(getter, setter, deler, "")) | |
| 111 | |
| 112 | |
| 113 class PropertyAccessor(object): | |
| 114 """A mixin class for Python 2.2 that uses AccessorType. | |
| 115 | |
| 116 This provides compatability with the pre-2.2 Accessor mixin, up | |
| 117 to a point. | |
| 118 | |
| 119 Extending this class will give you explicit accessor methods; a | |
| 120 method called set_foo, for example, is the same as an if statement | |
| 121 in __setattr__ looking for 'foo'. Same for get_foo and del_foo. | |
| 122 | |
| 123 There are also reallyDel and reallySet methods, so you can | |
| 124 override specifics in subclasses without clobbering __setattr__ | |
| 125 and __getattr__, or using non-2.1 compatible code. | |
| 126 | |
| 127 There is are incompatibilities with Accessor - accessor | |
| 128 methods added after class creation will *not* be detected. OTOH, | |
| 129 this method is probably way faster. | |
| 130 | |
| 131 In addition, class attributes will only be used if no getter | |
| 132 was defined, and instance attributes will not override getter methods | |
| 133 whereas in original Accessor the class attribute or instance attribute | |
| 134 would override the getter method. | |
| 135 """ | |
| 136 # addendum to above: | |
| 137 # The behaviour of Accessor is wrong IMHO, and I've found bugs | |
| 138 # caused by it. | |
| 139 # -- itamar | |
| 140 | |
| 141 __metaclass__ = AccessorType | |
| 142 | |
| 143 def reallySet(self, k, v): | |
| 144 self.__dict__[k] = v | |
| 145 | |
| 146 def reallyDel(self, k): | |
| 147 del self.__dict__[k] | |
| 148 | |
| 149 | |
| 150 class Accessor: | |
| 151 """ | |
| 152 Extending this class will give you explicit accessor methods; a | |
| 153 method called C{set_foo}, for example, is the same as an if statement | |
| 154 in L{__setattr__} looking for C{'foo'}. Same for C{get_foo} and | |
| 155 C{del_foo}. There are also L{reallyDel} and L{reallySet} methods, | |
| 156 so you can override specifics in subclasses without clobbering | |
| 157 L{__setattr__} and L{__getattr__}. | |
| 158 | |
| 159 This implementation is for Python 2.1. | |
| 160 """ | |
| 161 | |
| 162 def __setattr__(self, k,v): | |
| 163 kstring='set_%s'%k | |
| 164 if hasattr(self.__class__,kstring): | |
| 165 return getattr(self,kstring)(v) | |
| 166 else: | |
| 167 self.reallySet(k,v) | |
| 168 | |
| 169 def __getattr__(self, k): | |
| 170 kstring='get_%s'%k | |
| 171 if hasattr(self.__class__,kstring): | |
| 172 return getattr(self,kstring)() | |
| 173 raise AttributeError("%s instance has no accessor for: %s" % (qual(self.
__class__),k)) | |
| 174 | |
| 175 def __delattr__(self, k): | |
| 176 kstring='del_%s'%k | |
| 177 if hasattr(self.__class__,kstring): | |
| 178 getattr(self,kstring)() | |
| 179 return | |
| 180 self.reallyDel(k) | |
| 181 | |
| 182 def reallySet(self, k,v): | |
| 183 """ | |
| 184 *actually* set self.k to v without incurring side-effects. | |
| 185 This is a hook to be overridden by subclasses. | |
| 186 """ | |
| 187 if k == "__dict__": | |
| 188 self.__dict__.clear() | |
| 189 self.__dict__.update(v) | |
| 190 else: | |
| 191 self.__dict__[k]=v | |
| 192 | |
| 193 def reallyDel(self, k): | |
| 194 """ | |
| 195 *actually* del self.k without incurring side-effects. This is a | |
| 196 hook to be overridden by subclasses. | |
| 197 """ | |
| 198 del self.__dict__[k] | |
| 199 | |
| 200 # just in case | |
| 201 OriginalAccessor = Accessor | |
| 202 | |
| 203 | |
| 204 class Summer(Accessor): | |
| 205 """ | |
| 206 Extend from this class to get the capability to maintain 'related | |
| 207 sums'. Have a tuple in your class like the following:: | |
| 208 | |
| 209 sums=(('amount','credit','credit_total'), | |
| 210 ('amount','debit','debit_total')) | |
| 211 | |
| 212 and the 'credit_total' member of the 'credit' member of self will | |
| 213 always be incremented when the 'amount' member of self is | |
| 214 incremented, similiarly for the debit versions. | |
| 215 """ | |
| 216 | |
| 217 def reallySet(self, k,v): | |
| 218 "This method does the work." | |
| 219 for sum in self.sums: | |
| 220 attr=sum[0] | |
| 221 obj=sum[1] | |
| 222 objattr=sum[2] | |
| 223 if k == attr: | |
| 224 try: | |
| 225 oldval=getattr(self, attr) | |
| 226 except: | |
| 227 oldval=0 | |
| 228 diff=v-oldval | |
| 229 if hasattr(self, obj): | |
| 230 ob=getattr(self,obj) | |
| 231 if ob is not None: | |
| 232 try:oldobjval=getattr(ob, objattr) | |
| 233 except:oldobjval=0.0 | |
| 234 setattr(ob,objattr,oldobjval+diff) | |
| 235 | |
| 236 elif k == obj: | |
| 237 if hasattr(self, attr): | |
| 238 x=getattr(self,attr) | |
| 239 setattr(self,attr,0) | |
| 240 y=getattr(self,k) | |
| 241 Accessor.reallySet(self,k,v) | |
| 242 setattr(self,attr,x) | |
| 243 Accessor.reallySet(self,y,v) | |
| 244 Accessor.reallySet(self,k,v) | |
| 245 | |
| 246 class QueueMethod: | |
| 247 """ I represent a method that doesn't exist yet.""" | |
| 248 def __init__(self, name, calls): | |
| 249 self.name = name | |
| 250 self.calls = calls | |
| 251 def __call__(self, *args): | |
| 252 self.calls.append((self.name, args)) | |
| 253 | |
| 254 | |
| 255 def funcinfo(function): | |
| 256 """ | |
| 257 this is more documentation for myself than useful code. | |
| 258 """ | |
| 259 warnings.warn( | |
| 260 "[v2.5] Use inspect.getargspec instead of twisted.python.reflect.funcinf
o", | |
| 261 DeprecationWarning, | |
| 262 stacklevel=2) | |
| 263 code=function.func_code | |
| 264 name=function.func_name | |
| 265 argc=code.co_argcount | |
| 266 argv=code.co_varnames[:argc] | |
| 267 defaults=function.func_defaults | |
| 268 | |
| 269 out = [] | |
| 270 | |
| 271 out.append('The function %s accepts %s arguments' % (name ,argc)) | |
| 272 if defaults: | |
| 273 required=argc-len(defaults) | |
| 274 out.append('It requires %s arguments' % required) | |
| 275 out.append('The arguments required are: %s' % argv[:required]) | |
| 276 out.append('additional arguments are:') | |
| 277 for i in range(argc-required): | |
| 278 j=i+required | |
| 279 out.append('%s which has a default of' % (argv[j], defaults[i])) | |
| 280 return out | |
| 281 | |
| 282 | |
| 283 ISNT=0 | |
| 284 WAS=1 | |
| 285 IS=2 | |
| 286 | |
| 287 | |
| 288 def fullFuncName(func): | |
| 289 qualName = (str(pickle.whichmodule(func, func.__name__)) + '.' + func.__name
__) | |
| 290 if namedObject(qualName) is not func: | |
| 291 raise Exception("Couldn't find %s as %s." % (func, qualName)) | |
| 292 return qualName | |
| 293 | |
| 294 def qual(clazz): | |
| 295 """Return full import path of a class.""" | |
| 296 return clazz.__module__ + '.' + clazz.__name__ | |
| 297 | |
| 298 def getcurrent(clazz): | |
| 299 assert type(clazz) == types.ClassType, 'must be a class...' | |
| 300 module = namedModule(clazz.__module__) | |
| 301 currclass = getattr(module, clazz.__name__, None) | |
| 302 if currclass is None: | |
| 303 return clazz | |
| 304 return currclass | |
| 305 | |
| 306 def getClass(obj): | |
| 307 """Return the class or type of object 'obj'. | |
| 308 Returns sensible result for oldstyle and newstyle instances and types.""" | |
| 309 if hasattr(obj, '__class__'): | |
| 310 return obj.__class__ | |
| 311 else: | |
| 312 return type(obj) | |
| 313 | |
| 314 # class graph nonsense | |
| 315 | |
| 316 # I should really have a better name for this... | |
| 317 def isinst(inst,clazz): | |
| 318 if type(inst) != types.InstanceType or type(clazz)!= types.ClassType: | |
| 319 return isinstance(inst,clazz) | |
| 320 cl = inst.__class__ | |
| 321 cl2 = getcurrent(cl) | |
| 322 clazz = getcurrent(clazz) | |
| 323 if issubclass(cl2,clazz): | |
| 324 if cl == cl2: | |
| 325 return WAS | |
| 326 else: | |
| 327 inst.__class__ = cl2 | |
| 328 return IS | |
| 329 else: | |
| 330 return ISNT | |
| 331 | |
| 332 | |
| 333 def namedModule(name): | |
| 334 """Return a module given its name.""" | |
| 335 topLevel = __import__(name) | |
| 336 packages = name.split(".")[1:] | |
| 337 m = topLevel | |
| 338 for p in packages: | |
| 339 m = getattr(m, p) | |
| 340 return m | |
| 341 | |
| 342 | |
| 343 def namedObject(name): | |
| 344 """Get a fully named module-global object. | |
| 345 """ | |
| 346 classSplit = string.split(name, '.') | |
| 347 module = namedModule(string.join(classSplit[:-1], '.')) | |
| 348 return getattr(module, classSplit[-1]) | |
| 349 | |
| 350 namedClass = namedObject # backwards compat | |
| 351 | |
| 352 | |
| 353 | |
| 354 class _NoModuleFound(Exception): | |
| 355 """ | |
| 356 No module was found because none exists. | |
| 357 """ | |
| 358 | |
| 359 | |
| 360 | |
| 361 def _importAndCheckStack(importName): | |
| 362 """ | |
| 363 Import the given name as a module, then walk the stack to determine whether | |
| 364 the failure was the module not existing, or some code in the module (for | |
| 365 example a dependent import) failing. This can be helpful to determine | |
| 366 whether any actual application code was run. For example, to distiguish | |
| 367 administrative error (entering the wrong module name), from programmer | |
| 368 error (writing buggy code in a module that fails to import). | |
| 369 | |
| 370 @raise Exception: if something bad happens. This can be any type of | |
| 371 exception, since nobody knows what loading some arbitrary code might do. | |
| 372 | |
| 373 @raise _NoModuleFound: if no module was found. | |
| 374 """ | |
| 375 try: | |
| 376 try: | |
| 377 return __import__(importName) | |
| 378 except ImportError: | |
| 379 excType, excValue, excTraceback = sys.exc_info() | |
| 380 while excTraceback: | |
| 381 execName = excTraceback.tb_frame.f_globals["__name__"] | |
| 382 if (execName is None or # python 2.4+, post-cleanup | |
| 383 execName == importName): # python 2.3, no cleanup | |
| 384 raise excType, excValue, excTraceback | |
| 385 excTraceback = excTraceback.tb_next | |
| 386 raise _NoModuleFound() | |
| 387 except: | |
| 388 # Necessary for cleaning up modules in 2.3. | |
| 389 sys.modules.pop(importName, None) | |
| 390 raise | |
| 391 | |
| 392 | |
| 393 | |
| 394 def namedAny(name): | |
| 395 """ | |
| 396 Retrieve a Python object from the global Python module namespace, by its | |
| 397 fully qualified name. The first part of the name, that describes a module, | |
| 398 will be discovered and imported. | |
| 399 | |
| 400 @param name: the fully qualified name of a Python object, which is a | |
| 401 dot-separated list of python objects accessible via a name. This includes | |
| 402 packages, modules, and any Python object which has attributes. For | |
| 403 example, a fully-qualified name of this object is | |
| 404 'twisted.python.reflect.namedAny'. | |
| 405 | |
| 406 @type name: L{str} | |
| 407 | |
| 408 @return: the Python object identified by 'name'. | |
| 409 | |
| 410 @raise ValueError: if the top level dotted name that is passed is not a | |
| 411 valid Python identifier, or the top level dotted name that is passed is not | |
| 412 a valid python module. | |
| 413 | |
| 414 @raise AttributeError: if an attribute of an object along the way cannot be | |
| 415 accessed, or a module along the way is not found. | |
| 416 | |
| 417 @raise ImportError: if any module involved cannot be imported for some | |
| 418 reason. | |
| 419 """ | |
| 420 names = name.split('.') | |
| 421 topLevelPackage = None | |
| 422 moduleNames = names[:] | |
| 423 while not topLevelPackage: | |
| 424 trialname = '.'.join(moduleNames) | |
| 425 try: | |
| 426 topLevelPackage = _importAndCheckStack(trialname) | |
| 427 except _NoModuleFound: | |
| 428 moduleNames.pop() | |
| 429 | |
| 430 obj = topLevelPackage | |
| 431 for n in names[1:]: | |
| 432 obj = getattr(obj, n) | |
| 433 | |
| 434 return obj | |
| 435 | |
| 436 def _reclass(clazz): | |
| 437 clazz = getattr(namedModule(clazz.__module__),clazz.__name__) | |
| 438 clazz.__bases__ = tuple(map(_reclass, clazz.__bases__)) | |
| 439 return clazz | |
| 440 | |
| 441 | |
| 442 | |
| 443 | |
| 444 def macro(name, filename, source, **identifiers): | |
| 445 """macro(name, source, **identifiers) | |
| 446 | |
| 447 This allows you to create macro-like behaviors in python. See | |
| 448 twisted.python.hook for an example of its usage. | |
| 449 """ | |
| 450 if not identifiers.has_key('name'): | |
| 451 identifiers['name'] = name | |
| 452 source = source % identifiers | |
| 453 codeplace = "<%s (macro)>" % filename | |
| 454 code = compile(source, codeplace, 'exec') | |
| 455 | |
| 456 # shield your eyes! | |
| 457 sm = sys.modules | |
| 458 tprm = "twisted.python.reflect.macros" | |
| 459 if not sm.has_key(tprm): | |
| 460 macros = new.module(tprm) | |
| 461 sm[tprm] = macros | |
| 462 macros.count = 0 | |
| 463 macros = sm[tprm] | |
| 464 macros.count += 1 | |
| 465 macroname = 'macro_' + str(macros.count) | |
| 466 tprmm = tprm + '.' + macroname | |
| 467 mymod = new.module(tprmm) | |
| 468 sys.modules[tprmm] = mymod | |
| 469 setattr(macros, macroname, mymod) | |
| 470 dict = mymod.__dict__ | |
| 471 | |
| 472 # Before we go on, I guess I should explain why I just did that. Basically | |
| 473 # it's a gross hack to get epydoc to work right, but the general idea is | |
| 474 # that it will be a useful aid in debugging in _any_ app which expects | |
| 475 # sys.modules to have the same globals as some function. For example, it | |
| 476 # would be useful if you were foolishly trying to pickle a wrapped function | |
| 477 # directly from a class that had been hooked. | |
| 478 | |
| 479 exec code in dict, dict | |
| 480 return dict[name] | |
| 481 | |
| 482 def _determineClass(x): | |
| 483 try: | |
| 484 return x.__class__ | |
| 485 except: | |
| 486 return type(x) | |
| 487 | |
| 488 def _determineClassName(x): | |
| 489 c = _determineClass(x) | |
| 490 try: | |
| 491 return c.__name__ | |
| 492 except: | |
| 493 try: | |
| 494 return str(c) | |
| 495 except: | |
| 496 return '<BROKEN CLASS AT %s>' % id(c) | |
| 497 | |
| 498 def safe_repr(o): | |
| 499 """safe_repr(anything) -> string | |
| 500 | |
| 501 Returns a string representation of an object, or a string containing a | |
| 502 traceback, if that object's __repr__ raised an exception. | |
| 503 """ | |
| 504 | |
| 505 try: | |
| 506 return repr(o) | |
| 507 except: | |
| 508 io = StringIO.StringIO() | |
| 509 traceback.print_stack(file=io) | |
| 510 whati = _determineClassName(o) | |
| 511 swron = io.getvalue() | |
| 512 gwith = id(o) | |
| 513 you ='<%s instance at %s with repr error %s>' % ( | |
| 514 whati,swron,gwith) | |
| 515 return you | |
| 516 | |
| 517 def safe_str(o): | |
| 518 """safe_str(anything) -> string | |
| 519 | |
| 520 Returns a string representation of an object, or a string containing a | |
| 521 traceback, if that object's __str__ raised an exception. | |
| 522 """ | |
| 523 | |
| 524 try: | |
| 525 return str(o) | |
| 526 except: | |
| 527 strExc = '\n'.join(traceback.format_exception(*sys.exc_info())) | |
| 528 clsName = _determineClassName(o) | |
| 529 obId = id(o) | |
| 530 return '<%s instance at %s with str error %s>' % ( | |
| 531 clsName, obId, strExc) | |
| 532 | |
| 533 | |
| 534 ##the following were factored out of usage | |
| 535 | |
| 536 def allYourBase(classObj, baseClass=None): | |
| 537 """allYourBase(classObj, baseClass=None) -> list of all base | |
| 538 classes that are subclasses of baseClass, unless it is None, | |
| 539 in which case all bases will be added. | |
| 540 """ | |
| 541 l = [] | |
| 542 accumulateBases(classObj, l, baseClass) | |
| 543 return l | |
| 544 | |
| 545 | |
| 546 def accumulateBases(classObj, l, baseClass=None): | |
| 547 for base in classObj.__bases__: | |
| 548 if baseClass is None or issubclass(base, baseClass): | |
| 549 l.append(base) | |
| 550 accumulateBases(base, l, baseClass) | |
| 551 | |
| 552 | |
| 553 def prefixedMethodNames(classObj, prefix): | |
| 554 """A list of method names with a given prefix in a given class. | |
| 555 """ | |
| 556 dct = {} | |
| 557 addMethodNamesToDict(classObj, dct, prefix) | |
| 558 return dct.keys() | |
| 559 | |
| 560 | |
| 561 def addMethodNamesToDict(classObj, dict, prefix, baseClass=None): | |
| 562 """ | |
| 563 addMethodNamesToDict(classObj, dict, prefix, baseClass=None) -> dict | |
| 564 this goes through 'classObj' (and its bases) and puts method names | |
| 565 starting with 'prefix' in 'dict' with a value of 1. if baseClass isn't | |
| 566 None, methods will only be added if classObj is-a baseClass | |
| 567 | |
| 568 If the class in question has the methods 'prefix_methodname' and | |
| 569 'prefix_methodname2', the resulting dict should look something like: | |
| 570 {"methodname": 1, "methodname2": 1}. | |
| 571 """ | |
| 572 for base in classObj.__bases__: | |
| 573 addMethodNamesToDict(base, dict, prefix, baseClass) | |
| 574 | |
| 575 if baseClass is None or baseClass in classObj.__bases__: | |
| 576 for name, method in classObj.__dict__.items(): | |
| 577 optName = name[len(prefix):] | |
| 578 if ((type(method) is types.FunctionType) | |
| 579 and (name[:len(prefix)] == prefix) | |
| 580 and (len(optName))): | |
| 581 dict[optName] = 1 | |
| 582 | |
| 583 def prefixedMethods(obj, prefix=''): | |
| 584 """A list of methods with a given prefix on a given instance. | |
| 585 """ | |
| 586 dct = {} | |
| 587 accumulateMethods(obj, dct, prefix) | |
| 588 return dct.values() | |
| 589 | |
| 590 def accumulateMethods(obj, dict, prefix='', curClass=None): | |
| 591 """accumulateMethods(instance, dict, prefix) | |
| 592 I recurse through the bases of instance.__class__, and add methods | |
| 593 beginning with 'prefix' to 'dict', in the form of | |
| 594 {'methodname':*instance*method_object}. | |
| 595 """ | |
| 596 if not curClass: | |
| 597 curClass = obj.__class__ | |
| 598 for base in curClass.__bases__: | |
| 599 accumulateMethods(obj, dict, prefix, base) | |
| 600 | |
| 601 for name, method in curClass.__dict__.items(): | |
| 602 optName = name[len(prefix):] | |
| 603 if ((type(method) is types.FunctionType) | |
| 604 and (name[:len(prefix)] == prefix) | |
| 605 and (len(optName))): | |
| 606 dict[optName] = getattr(obj, name) | |
| 607 | |
| 608 def accumulateClassDict(classObj, attr, adict, baseClass=None): | |
| 609 """Accumulate all attributes of a given name in a class heirarchy into a sin
gle dictionary. | |
| 610 | |
| 611 Assuming all class attributes of this name are dictionaries. | |
| 612 If any of the dictionaries being accumulated have the same key, the | |
| 613 one highest in the class heirarchy wins. | |
| 614 (XXX: If \"higest\" means \"closest to the starting class\".) | |
| 615 | |
| 616 Ex:: | |
| 617 | |
| 618 | class Soy: | |
| 619 | properties = {\"taste\": \"bland\"} | |
| 620 | | |
| 621 | class Plant: | |
| 622 | properties = {\"colour\": \"green\"} | |
| 623 | | |
| 624 | class Seaweed(Plant): | |
| 625 | pass | |
| 626 | | |
| 627 | class Lunch(Soy, Seaweed): | |
| 628 | properties = {\"vegan\": 1 } | |
| 629 | | |
| 630 | dct = {} | |
| 631 | | |
| 632 | accumulateClassDict(Lunch, \"properties\", dct) | |
| 633 | | |
| 634 | print dct | |
| 635 | |
| 636 {\"taste\": \"bland\", \"colour\": \"green\", \"vegan\": 1} | |
| 637 """ | |
| 638 for base in classObj.__bases__: | |
| 639 accumulateClassDict(base, attr, adict) | |
| 640 if baseClass is None or baseClass in classObj.__bases__: | |
| 641 adict.update(classObj.__dict__.get(attr, {})) | |
| 642 | |
| 643 | |
| 644 def accumulateClassList(classObj, attr, listObj, baseClass=None): | |
| 645 """Accumulate all attributes of a given name in a class heirarchy into a sin
gle list. | |
| 646 | |
| 647 Assuming all class attributes of this name are lists. | |
| 648 """ | |
| 649 for base in classObj.__bases__: | |
| 650 accumulateClassList(base, attr, listObj) | |
| 651 if baseClass is None or baseClass in classObj.__bases__: | |
| 652 listObj.extend(classObj.__dict__.get(attr, [])) | |
| 653 | |
| 654 | |
| 655 def isSame(a, b): | |
| 656 return (a is b) | |
| 657 | |
| 658 def isLike(a, b): | |
| 659 return (a == b) | |
| 660 | |
| 661 def modgrep(goal): | |
| 662 return objgrep(sys.modules, goal, isLike, 'sys.modules') | |
| 663 | |
| 664 def isOfType(start, goal): | |
| 665 return ((type(start) is goal) or | |
| 666 (isinstance(start, types.InstanceType) and | |
| 667 start.__class__ is goal)) | |
| 668 | |
| 669 | |
| 670 def findInstances(start, t): | |
| 671 return objgrep(start, t, isOfType) | |
| 672 | |
| 673 def objgrep(start, goal, eq=isLike, path='', paths=None, seen=None, showUnknowns
=0, maxDepth=None): | |
| 674 '''An insanely CPU-intensive process for finding stuff. | |
| 675 ''' | |
| 676 if paths is None: | |
| 677 paths = [] | |
| 678 if seen is None: | |
| 679 seen = {} | |
| 680 if eq(start, goal): | |
| 681 paths.append(path) | |
| 682 if seen.has_key(id(start)): | |
| 683 if seen[id(start)] is start: | |
| 684 return | |
| 685 if maxDepth is not None: | |
| 686 if maxDepth == 0: | |
| 687 return | |
| 688 maxDepth -= 1 | |
| 689 seen[id(start)] = start | |
| 690 if isinstance(start, types.DictionaryType): | |
| 691 r = [] | |
| 692 for k, v in start.items(): | |
| 693 objgrep(k, goal, eq, path+'{'+repr(v)+'}', paths, seen, showUnknowns
, maxDepth) | |
| 694 objgrep(v, goal, eq, path+'['+repr(k)+']', paths, seen, showUnknowns
, maxDepth) | |
| 695 elif isinstance(start, (list, tuple, deque)): | |
| 696 for idx in xrange(len(start)): | |
| 697 objgrep(start[idx], goal, eq, path+'['+str(idx)+']', paths, seen, sh
owUnknowns, maxDepth) | |
| 698 elif isinstance(start, types.MethodType): | |
| 699 objgrep(start.im_self, goal, eq, path+'.im_self', paths, seen, showUnkno
wns, maxDepth) | |
| 700 objgrep(start.im_func, goal, eq, path+'.im_func', paths, seen, showUnkno
wns, maxDepth) | |
| 701 objgrep(start.im_class, goal, eq, path+'.im_class', paths, seen, showUnk
nowns, maxDepth) | |
| 702 elif hasattr(start, '__dict__'): | |
| 703 for k, v in start.__dict__.items(): | |
| 704 objgrep(v, goal, eq, path+'.'+k, paths, seen, showUnknowns, maxDepth
) | |
| 705 if isinstance(start, types.InstanceType): | |
| 706 objgrep(start.__class__, goal, eq, path+'.__class__', paths, seen, s
howUnknowns, maxDepth) | |
| 707 elif isinstance(start, weakref.ReferenceType): | |
| 708 objgrep(start(), goal, eq, path+'()', paths, seen, showUnknowns, maxDept
h) | |
| 709 elif (isinstance(start, types.StringTypes+ | |
| 710 (types.IntType, types.FunctionType, | |
| 711 types.BuiltinMethodType, RegexType, types.FloatType, | |
| 712 types.NoneType, types.FileType)) or | |
| 713 type(start).__name__ in ('wrapper_descriptor', 'method_descriptor', | |
| 714 'member_descriptor', 'getset_descriptor')): | |
| 715 pass | |
| 716 elif showUnknowns: | |
| 717 print 'unknown type', type(start), start | |
| 718 return paths | |
| 719 | |
| 720 | |
| 721 def filenameToModuleName(fn): | |
| 722 """ | |
| 723 Convert a name in the filesystem to the name of the Python module it is. | |
| 724 | |
| 725 This is agressive about getting a module name back from a file; it will | |
| 726 always return a string. Agressive means 'sometimes wrong'; it won't look | |
| 727 at the Python path or try to do any error checking: don't use this method | |
| 728 unless you already know that the filename you're talking about is a Python | |
| 729 module. | |
| 730 """ | |
| 731 fullName = os.path.abspath(fn) | |
| 732 base = os.path.basename(fn) | |
| 733 if not base: | |
| 734 # this happens when fn ends with a path separator, just skit it | |
| 735 base = os.path.basename(fn[:-1]) | |
| 736 modName = os.path.splitext(base)[0] | |
| 737 while 1: | |
| 738 fullName = os.path.dirname(fullName) | |
| 739 if os.path.exists(os.path.join(fullName, "__init__.py")): | |
| 740 modName = "%s.%s" % (os.path.basename(fullName), modName) | |
| 741 else: | |
| 742 break | |
| 743 return modName | |
| 744 | |
| 745 #boo python | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 12261012:
Remove third_party/twisted_8_1 (Closed)
Base URL: svn://svn.chromium.org/chrome/trunk/tools/build