This file is indexed.

/usr/lib/python2.7/dist-packages/pyqtgraph/reload.py is in python-pyqtgraph 0.10.0-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
# -*- coding: utf-8 -*-
"""
Magic Reload Library
Luke Campagnola   2010

Python reload function that actually works (the way you expect it to)
 - No re-importing necessary
 - Modules can be reloaded in any order
 - Replaces functions and methods with their updated code
 - Changes instances to use updated classes
 - Automatically decides which modules to update by comparing file modification times
 
Does NOT:
 - re-initialize exting instances, even if __init__ changes
 - update references to any module-level objects
   ie, this does not reload correctly:
       from module import someObject
       print someObject
   ..but you can use this instead: (this works even for the builtin reload)
       import module
       print module.someObject
"""


import inspect, os, sys, gc, traceback
try:
    import __builtin__ as builtins
except ImportError:
    import builtins
from .debug import printExc

def reloadAll(prefix=None, debug=False):
    """Automatically reload everything whose __file__ begins with prefix.
    - Skips reload if the file has not been updated (if .pyc is newer than .py)
    - if prefix is None, checks all loaded modules
    """
    failed = []
    changed = []
    for modName, mod in list(sys.modules.items()):  ## don't use iteritems; size may change during reload
        if not inspect.ismodule(mod):
            continue
        if modName == '__main__':
            continue
        
        ## Ignore if the file name does not start with prefix
        if not hasattr(mod, '__file__') or os.path.splitext(mod.__file__)[1] not in ['.py', '.pyc']:
            continue
        if prefix is not None and mod.__file__[:len(prefix)] != prefix:
            continue
        
        ## ignore if the .pyc is newer than the .py (or if there is no pyc or py)
        py = os.path.splitext(mod.__file__)[0] + '.py'
        pyc = py + 'c'
        if py not in changed and os.path.isfile(pyc) and os.path.isfile(py) and os.stat(pyc).st_mtime >= os.stat(py).st_mtime:
            #if debug:
                #print "Ignoring module %s; unchanged" % str(mod)
            continue
        changed.append(py)  ## keep track of which modules have changed to insure that duplicate-import modules get reloaded.
        
        try:
            reload(mod, debug=debug)
        except:
            printExc("Error while reloading module %s, skipping\n" % mod)
            failed.append(mod.__name__)
        
    if len(failed) > 0:
        raise Exception("Some modules failed to reload: %s" % ', '.join(failed))

def reload(module, debug=False, lists=False, dicts=False):
    """Replacement for the builtin reload function:
    - Reloads the module as usual
    - Updates all old functions and class methods to use the new code
    - Updates all instances of each modified class to use the new class
    - Can update lists and dicts, but this is disabled by default
    - Requires that class and function names have not changed
    """
    if debug:
        print("Reloading %s" % str(module))
        
    ## make a copy of the old module dictionary, reload, then grab the new module dictionary for comparison
    oldDict = module.__dict__.copy()
    builtins.reload(module)
    newDict = module.__dict__
    
    ## Allow modules access to the old dictionary after they reload
    if hasattr(module, '__reload__'):
        module.__reload__(oldDict)
    
    ## compare old and new elements from each dict; update where appropriate
    for k in oldDict:
        old = oldDict[k]
        new = newDict.get(k, None)
        if old is new or new is None:
            continue
        
        if inspect.isclass(old):
            if debug:
                print("  Updating class %s.%s (0x%x -> 0x%x)" % (module.__name__, k, id(old), id(new)))
            updateClass(old, new, debug)
                    
        elif inspect.isfunction(old):
            depth = updateFunction(old, new, debug)
            if debug:
                extra = ""
                if depth > 0:
                    extra = " (and %d previous versions)" % depth
                print("  Updating function %s.%s%s" % (module.__name__, k, extra))
        elif lists and isinstance(old, list):
            l = old.len()
            old.extend(new)
            for i in range(l):
                old.pop(0)
        elif dicts and isinstance(old, dict):
            old.update(new)
            for k in old:
                if k not in new:
                    del old[k]
        


## For functions:
##  1) update the code and defaults to new versions.
##  2) keep a reference to the previous version so ALL versions get updated for every reload
def updateFunction(old, new, debug, depth=0, visited=None):
    #if debug and depth > 0:
        #print "    -> also updating previous version", old, " -> ", new
        
    old.__code__ = new.__code__
    old.__defaults__ = new.__defaults__
    
    if visited is None:
        visited = []
    if old in visited:
        return
    visited.append(old)
    
    ## finally, update any previous versions still hanging around..
    if hasattr(old, '__previous_reload_version__'):
        maxDepth = updateFunction(old.__previous_reload_version__, new, debug, depth=depth+1, visited=visited)
    else:
        maxDepth = depth
        
    ## We need to keep a pointer to the previous version so we remember to update BOTH
    ## when the next reload comes around.
    if depth == 0:
        new.__previous_reload_version__ = old
    return maxDepth



## For classes:
##  1) find all instances of the old class and set instance.__class__ to the new class
##  2) update all old class methods to use code from the new class methods
def updateClass(old, new, debug):

    ## Track town all instances and subclasses of old
    refs = gc.get_referrers(old)
    for ref in refs:
        try:
            if isinstance(ref, old) and ref.__class__ is old:
                ref.__class__ = new
                if debug:
                    print("    Changed class for %s" % safeStr(ref))
            elif inspect.isclass(ref) and issubclass(ref, old) and old in ref.__bases__:
                ind = ref.__bases__.index(old)
                
                ## Does not work:
                #ref.__bases__ = ref.__bases__[:ind] + (new,) + ref.__bases__[ind+1:]
                ## reason: Even though we change the code on methods, they remain bound
                ## to their old classes (changing im_class is not allowed). Instead,
                ## we have to update the __bases__ such that this class will be allowed
                ## as an argument to older methods.
                
                ## This seems to work. Is there any reason not to?
                ## Note that every time we reload, the class hierarchy becomes more complex.
                ## (and I presume this may slow things down?)
                ref.__bases__ = ref.__bases__[:ind] + (new,old) + ref.__bases__[ind+1:]
                if debug:
                    print("    Changed superclass for %s" % safeStr(ref))
            #else:
                #if debug:
                    #print "    Ignoring reference", type(ref)
        except:
            print("Error updating reference (%s) for class change (%s -> %s)" % (safeStr(ref), safeStr(old), safeStr(new)))
            raise
        
    ## update all class methods to use new code.
    ## Generally this is not needed since instances already know about the new class, 
    ## but it fixes a few specific cases (pyqt signals, for one)
    for attr in dir(old):
        oa = getattr(old, attr)
        if inspect.ismethod(oa):
            try:
                na = getattr(new, attr)
            except AttributeError:
                if debug:
                    print("    Skipping method update for %s; new class does not have this attribute" % attr)
                continue
                
            if hasattr(oa, 'im_func') and hasattr(na, 'im_func') and oa.__func__ is not na.__func__:
                depth = updateFunction(oa.__func__, na.__func__, debug)
                #oa.im_class = new  ## bind old method to new class  ## not allowed
                if debug:
                    extra = ""
                    if depth > 0:
                        extra = " (and %d previous versions)" % depth
                    print("    Updating method %s%s" % (attr, extra))
                
    ## And copy in new functions that didn't exist previously
    for attr in dir(new):
        if not hasattr(old, attr):
            if debug:
                print("    Adding missing attribute %s" % attr)
            setattr(old, attr, getattr(new, attr))
            
    ## finally, update any previous versions still hanging around..
    if hasattr(old, '__previous_reload_version__'):
        updateClass(old.__previous_reload_version__, new, debug)


## It is possible to build classes for which str(obj) just causes an exception.
## Avoid thusly:
def safeStr(obj):
    try:
        s = str(obj)
    except:
        try:
            s = repr(obj)
        except:
            s = "<instance of %s at 0x%x>" % (safeStr(type(obj)), id(obj))
    return s





## Tests:
#  write modules to disk, import, then re-write and run again
if __name__ == '__main__':
    doQtTest = True
    try:
        from PyQt4 import QtCore
        if not hasattr(QtCore, 'Signal'):
            QtCore.Signal = QtCore.pyqtSignal
        #app = QtGui.QApplication([])
        class Btn(QtCore.QObject):
            sig = QtCore.Signal()
            def emit(self):
                self.sig.emit()
        btn = Btn()
    except:
        raise
        print("Error; skipping Qt tests")
        doQtTest = False



    import os
    if not os.path.isdir('test1'):
        os.mkdir('test1')
    open('test1/__init__.py', 'w')
    modFile1 = "test1/test1.py"
    modCode1 = """
import sys
class A(object):
    def __init__(self, msg):
        object.__init__(self)
        self.msg = msg
    def fn(self, pfx = ""):
        print(pfx+"A class: %%s %%s" %% (str(self.__class__), str(id(self.__class__))))
        print(pfx+"  %%s: %d" %% self.msg)

class B(A):
    def fn(self, pfx=""):
        print(pfx+"B class:", self.__class__, id(self.__class__))
        print(pfx+"  %%s: %d" %% self.msg)
        print(pfx+"  calling superclass.. (%%s)" %% id(A) )
        A.fn(self, "  ")
"""

    modFile2 = "test2.py"
    modCode2 = """
from test1.test1 import A
from test1.test1 import B

a1 = A("ax1")
b1 = B("bx1")
class C(A):
    def __init__(self, msg):
        #print "| C init:"
        #print "|   C.__bases__ = ", map(id, C.__bases__)
        #print "|   A:", id(A)
        #print "|   A.__init__ = ", id(A.__init__.im_func), id(A.__init__.im_func.__code__), id(A.__init__.im_class)
        A.__init__(self, msg + "(init from C)")
        
def fn():
    print("fn: %s")
""" 

    open(modFile1, 'w').write(modCode1%(1,1))
    open(modFile2, 'w').write(modCode2%"message 1")
    import test1.test1 as test1
    import test2
    print("Test 1 originals:")
    A1 = test1.A
    B1 = test1.B
    a1 = test1.A("a1")
    b1 = test1.B("b1")
    a1.fn()
    b1.fn()
    #print "function IDs  a1 bound method: %d a1 func: %d  a1 class: %d  b1 func: %d  b1 class: %d" % (id(a1.fn), id(a1.fn.im_func), id(a1.fn.im_class), id(b1.fn.im_func), id(b1.fn.im_class))


    from test2 import fn, C
    
    if doQtTest:
        print("Button test before:")
        btn.sig.connect(fn)
        btn.sig.connect(a1.fn)
        btn.emit()
        #btn.sig.emit()
        print("")
    
    #print "a1.fn referrers:", sys.getrefcount(a1.fn.im_func), gc.get_referrers(a1.fn.im_func)
    
    
    print("Test2 before reload:")
    
    fn()
    oldfn = fn
    test2.a1.fn()
    test2.b1.fn()
    c1 = test2.C('c1')
    c1.fn()
    
    os.remove(modFile1+'c')
    open(modFile1, 'w').write(modCode1%(2,2))
    print("\n----RELOAD test1-----\n")
    reloadAll(os.path.abspath(__file__)[:10], debug=True)
    
    
    print("Subclass test:")
    c2 = test2.C('c2')
    c2.fn()
    
    
    os.remove(modFile2+'c')
    open(modFile2, 'w').write(modCode2%"message 2")
    print("\n----RELOAD test2-----\n")
    reloadAll(os.path.abspath(__file__)[:10], debug=True)

    if doQtTest:
        print("Button test after:")
        btn.emit()
        #btn.sig.emit()

    #print "a1.fn referrers:", sys.getrefcount(a1.fn.im_func), gc.get_referrers(a1.fn.im_func)

    print("Test2 after reload:")
    fn()
    test2.a1.fn()
    test2.b1.fn()
    
    print("\n==> Test 1 Old instances:")
    a1.fn()
    b1.fn()
    c1.fn()
    #print "function IDs  a1 bound method: %d a1 func: %d  a1 class: %d  b1 func: %d  b1 class: %d" % (id(a1.fn), id(a1.fn.im_func), id(a1.fn.im_class), id(b1.fn.im_func), id(b1.fn.im_class))

    print("\n==> Test 1 New instances:")
    a2 = test1.A("a2")
    b2 = test1.B("b2")
    a2.fn()
    b2.fn()
    c2 = test2.C('c2')
    c2.fn()
    #print "function IDs  a1 bound method: %d a1 func: %d  a1 class: %d  b1 func: %d  b1 class: %d" % (id(a1.fn), id(a1.fn.im_func), id(a1.fn.im_class), id(b1.fn.im_func), id(b1.fn.im_class))




    os.remove(modFile1+'c')
    os.remove(modFile2+'c')
    open(modFile1, 'w').write(modCode1%(3,3))
    open(modFile2, 'w').write(modCode2%"message 3")
    
    print("\n----RELOAD-----\n")
    reloadAll(os.path.abspath(__file__)[:10], debug=True)

    if doQtTest:
        print("Button test after:")
        btn.emit()
        #btn.sig.emit()

    #print "a1.fn referrers:", sys.getrefcount(a1.fn.im_func), gc.get_referrers(a1.fn.im_func)

    print("Test2 after reload:")
    fn()
    test2.a1.fn()
    test2.b1.fn()
    
    print("\n==> Test 1 Old instances:")
    a1.fn()
    b1.fn()
    print("function IDs  a1 bound method: %d a1 func: %d  a1 class: %d  b1 func: %d  b1 class: %d" % (id(a1.fn), id(a1.fn.__func__), id(a1.fn.__self__.__class__), id(b1.fn.__func__), id(b1.fn.__self__.__class__)))

    print("\n==> Test 1 New instances:")
    a2 = test1.A("a2")
    b2 = test1.B("b2")
    a2.fn()
    b2.fn()
    print("function IDs  a1 bound method: %d a1 func: %d  a1 class: %d  b1 func: %d  b1 class: %d" % (id(a1.fn), id(a1.fn.__func__), id(a1.fn.__self__.__class__), id(b1.fn.__func__), id(b1.fn.__self__.__class__)))


    os.remove(modFile1)
    os.remove(modFile2)
    os.remove(modFile1+'c')
    os.remove(modFile2+'c')
    os.system('rm -r test1')








#
#        Failure graveyard ahead:
#


"""Reload Importer:
Hooks into import system to 
1) keep a record of module dependencies as they are imported
2) make sure modules are always reloaded in correct order
3) update old classes and functions to use reloaded code"""

#import imp, sys

## python's import hook mechanism doesn't work since we need to be 
## informed every time there is an import statement, not just for new imports
#class ReloadImporter:
    #def __init__(self):
        #self.depth = 0
        
    #def find_module(self, name, path):
        #print "  "*self.depth + "find: ", name, path
        ##if name == 'PyQt4' and path is None:
            ##print "PyQt4 -> PySide"
            ##self.modData = imp.find_module('PySide')
            ##return self
        ##return None ## return none to allow the import to proceed normally; return self to intercept with load_module
        #self.modData = imp.find_module(name, path)
        #self.depth += 1
        ##sys.path_importer_cache = {}
        #return self
        
    #def load_module(self, name):
        #mod =  imp.load_module(name, *self.modData)
        #self.depth -= 1
        #print "  "*self.depth + "load: ", name
        #return mod

#def pathHook(path):
    #print "path hook:", path
    #raise ImportError
#sys.path_hooks.append(pathHook)

#sys.meta_path.append(ReloadImporter())


### replace __import__ with a wrapper that tracks module dependencies
#modDeps = {}
#reloadModule = None
#origImport = __builtins__.__import__
#def _import(name, globals=None, locals=None, fromlist=None, level=-1, stack=[]):
    ### Note that stack behaves as a static variable.
    ##print "  "*len(importStack) + "import %s" % args[0]
    #stack.append(set())
    #mod = origImport(name, globals, locals, fromlist, level)
    #deps = stack.pop()
    #if len(stack) > 0:
        #stack[-1].add(mod)
    #elif reloadModule is not None:     ## If this is the top level import AND we're inside a module reload
        #modDeps[reloadModule].add(mod)
            
    #if mod in modDeps:
        #modDeps[mod] |= deps
    #else:
        #modDeps[mod] = deps
        
    
    #return mod
    
#__builtins__.__import__ = _import

### replace 
#origReload = __builtins__.reload
#def _reload(mod):
    #reloadModule = mod
    #ret = origReload(mod)
    #reloadModule = None
    #return ret
#__builtins__.reload = _reload


#def reload(mod, visited=None):
    #if visited is None:
        #visited = set()
    #if mod in visited:
        #return
    #visited.add(mod)
    #for dep in modDeps.get(mod, []):
        #reload(dep, visited)
    #__builtins__.reload(mod)