pyobjc / pyobjc / MPCompat / modulefinder.py

  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
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
"""Find modules used by a script, using introspection."""

# This module should be kept compatible with Python 2.2, see PEP 291.

import dis
import imp
import marshal
import os
import sys
import new

if hasattr(sys.__stdout__, "newlines"):
    READ_MODE = "U"  # universal line endings
else:
    # remain compatible with Python  < 2.3
    READ_MODE = "r"

LOAD_CONST = dis.opname.index('LOAD_CONST')
IMPORT_NAME = dis.opname.index('IMPORT_NAME')
STORE_NAME = dis.opname.index('STORE_NAME')
STORE_GLOBAL = dis.opname.index('STORE_GLOBAL')
STORE_OPS = [STORE_NAME, STORE_GLOBAL]

# Modulefinder does a good job at simulating Python's, but it can not
# handle __path__ modifications packages make at runtime.  Therefore there
# is a mechanism whereby you can register extra paths in this map for a
# package, and it will be honored.

# Note this is a mapping is lists of paths.
packagePathMap = {}

# A Public interface
def AddPackagePath(packagename, path):
    paths = packagePathMap.get(packagename, [])
    paths.append(path)
    packagePathMap[packagename] = paths

replacePackageMap = {}

# This ReplacePackage mechanism allows modulefinder to work around the
# way the _xmlplus package injects itself under the name "xml" into
# sys.modules at runtime by calling ReplacePackage("_xmlplus", "xml")
# before running ModuleFinder.

def ReplacePackage(oldname, newname):
    replacePackageMap[oldname] = newname


class Module:

    def __init__(self, name, file=None, path=None):
        self.__name__ = name
        self.__file__ = file
        self.__path__ = path
        self.__code__ = None
        # The set of global names that are assigned to in the module.
        # This includes those names imported through starimports of
        # Python modules.
        self.globalnames = {}
        # The set of starimports this module did that could not be
        # resolved, ie. a starimport from a non-Python module.
        self.starimports = {}

    def __repr__(self):
        s = "Module(%r" % (self.__name__,)
        if self.__file__ is not None:
            s = s + ", %r" % (self.__file__,)
        if self.__path__ is not None:
            s = s + ", %r" % (self.__path__,)
        s = s + ")"
        return s

class ModuleFinder:

    def __init__(self, path=None, debug=0, excludes=[], replace_paths=[]):
        if path is None:
            path = sys.path
        self.path = path
        self.modules = {}
        self.badmodules = {}
        self.debug = debug
        self.indent = 0
        self.excludes = excludes
        self.replace_paths = replace_paths
        self.processed_paths = []   # Used in debugging only

    def msg(self, level, str, *args):
        if level <= self.debug:
            for i in range(self.indent):
                print "   ",
            print str,
            for arg in args:
                print repr(arg),
            print

    def msgin(self, *args):
        level = args[0]
        if level <= self.debug:
            self.indent = self.indent + 1
            self.msg(*args)

    def msgout(self, *args):
        level = args[0]
        if level <= self.debug:
            self.indent = self.indent - 1
            self.msg(*args)

    def run_script(self, pathname):
        self.msg(2, "run_script", pathname)
        fp = open(pathname, READ_MODE)
        stuff = ("", "r", imp.PY_SOURCE)
        self.load_module('__main__', fp, pathname, stuff)

    def load_file(self, pathname):
        dir, name = os.path.split(pathname)
        name, ext = os.path.splitext(name)
        fp = open(pathname, READ_MODE)
        stuff = (ext, "r", imp.PY_SOURCE)
        self.load_module(name, fp, pathname, stuff)

    def import_hook(self, name, caller=None, fromlist=None):
        self.msg(3, "import_hook", name, caller, fromlist)
        parent = self.determine_parent(caller)
        q, tail = self.find_head_package(parent, name)
        m = self.load_tail(q, tail)
        if not fromlist:
            return q
        if m.__path__:
            self.ensure_fromlist(m, fromlist)
        return None

    def determine_parent(self, caller):
        self.msgin(4, "determine_parent", caller)
        if not caller:
            self.msgout(4, "determine_parent -> None")
            return None
        pname = caller.__name__
        if caller.__path__:
            parent = self.modules[pname]
            assert caller is parent
            self.msgout(4, "determine_parent ->", parent)
            return parent
        if '.' in pname:
            i = pname.rfind('.')
            pname = pname[:i]
            parent = self.modules[pname]
            assert parent.__name__ == pname
            self.msgout(4, "determine_parent ->", parent)
            return parent
        self.msgout(4, "determine_parent -> None")
        return None

    def find_head_package(self, parent, name):
        self.msgin(4, "find_head_package", parent, name)
        if '.' in name:
            i = name.find('.')
            head = name[:i]
            tail = name[i+1:]
        else:
            head = name
            tail = ""
        if parent:
            qname = "%s.%s" % (parent.__name__, head)
        else:
            qname = head
        q = self.import_module(head, qname, parent)
        if q:
            self.msgout(4, "find_head_package ->", (q, tail))
            return q, tail
        if parent:
            qname = head
            parent = None
            q = self.import_module(head, qname, parent)
            if q:
                self.msgout(4, "find_head_package ->", (q, tail))
                return q, tail
        self.msgout(4, "raise ImportError: No module named", qname)
        raise ImportError, "No module named " + qname

    def load_tail(self, q, tail):
        self.msgin(4, "load_tail", q, tail)
        m = q
        while tail:
            i = tail.find('.')
            if i < 0: i = len(tail)
            head, tail = tail[:i], tail[i+1:]
            mname = "%s.%s" % (m.__name__, head)
            m = self.import_module(head, mname, m)
            if not m:
                self.msgout(4, "raise ImportError: No module named", mname)
                raise ImportError, "No module named " + mname
        self.msgout(4, "load_tail ->", m)
        return m

    def ensure_fromlist(self, m, fromlist, recursive=0):
        self.msg(4, "ensure_fromlist", m, fromlist, recursive)
        for sub in fromlist:
            if sub == "*":
                if not recursive:
                    all = self.find_all_submodules(m)
                    if all:
                        self.ensure_fromlist(m, all, 1)
            elif not hasattr(m, sub):
                subname = "%s.%s" % (m.__name__, sub)
                submod = self.import_module(sub, subname, m)
                if not submod:
                    raise ImportError, "No module named " + subname

    def find_all_submodules(self, m):
        if not m.__path__:
            return
        modules = {}
        # 'suffixes' used to be a list hardcoded to [".py", ".pyc", ".pyo"].
        # But we must also collect Python extension modules - although
        # we cannot separate normal dlls from Python extensions.
        suffixes = []
        for triple in imp.get_suffixes():
            suffixes.append(triple[0])
        for dir in m.__path__:
            try:
                names = os.listdir(dir)
            except os.error:
                self.msg(2, "can't list directory", dir)
                continue
            for name in names:
                mod = None
                for suff in suffixes:
                    n = len(suff)
                    if name[-n:] == suff:
                        mod = name[:-n]
                        break
                if mod and mod != "__init__":
                    modules[mod] = mod
        return modules.keys()

    def import_module(self, partname, fqname, parent):
        self.msgin(3, "import_module", partname, fqname, parent)
        try:
            m = self.modules[fqname]
        except KeyError:
            pass
        else:
            self.msgout(3, "import_module ->", m)
            return m
        if self.badmodules.has_key(fqname):
            self.msgout(3, "import_module -> None")
            return None
        try:
            fp, pathname, stuff = self.find_module(partname,
                                                   parent and parent.__path__, parent)
        except ImportError:
            self.msgout(3, "import_module ->", None)
            return None
        try:
            m = self.load_module(fqname, fp, pathname, stuff)
        finally:
            if fp: fp.close()
        if parent:
            setattr(parent, partname, m)
        self.msgout(3, "import_module ->", m)
        return m

    def load_module(self, fqname, fp, pathname, (suffix, mode, type)):
        self.msgin(2, "load_module", fqname, fp and "fp", pathname)
        if type == imp.PKG_DIRECTORY:
            m = self.load_package(fqname, pathname)
            self.msgout(2, "load_module ->", m)
            return m
        if type == imp.PY_SOURCE:
            co = compile(fp.read()+'\n', pathname, 'exec')
        elif type == imp.PY_COMPILED:
            if fp.read(4) != imp.get_magic():
                self.msgout(2, "raise ImportError: Bad magic number", pathname)
                raise ImportError, "Bad magic number in %s" % pathname
            fp.read(4)
            co = marshal.load(fp)
        else:
            co = None
        m = self.add_module(fqname)
        m.__file__ = pathname
        if co:
            if self.replace_paths:
                co = self.replace_paths_in_code(co)
            m.__code__ = co
            self.scan_code(co, m)
        self.msgout(2, "load_module ->", m)
        return m

    def _add_badmodule(self, name, caller):
        if name not in self.badmodules:
            self.badmodules[name] = {}
        self.badmodules[name][caller.__name__] = 1

    def _safe_import_hook(self, name, caller, fromlist):
        # wrapper for self.import_hook() that won't raise ImportError
        if name in self.badmodules:
            self._add_badmodule(name, caller)
            return
        try:
            self.import_hook(name, caller)
        except ImportError, msg:
            self.msg(2, "ImportError:", str(msg))
            self._add_badmodule(name, caller)
        else:
            if fromlist:
                for sub in fromlist:
                    if sub in self.badmodules:
                        self._add_badmodule(sub, caller)
                        continue
                    try:
                        self.import_hook(name, caller, [sub])
                    except ImportError, msg:
                        self.msg(2, "ImportError:", str(msg))
                        fullname = name + "." + sub
                        self._add_badmodule(fullname, caller)

    def scan_code(self, co, m):
        code = co.co_code
        n = len(code)
        i = 0
        fromlist = None
        while i < n:
            c = code[i]
            i = i+1
            op = ord(c)
            if op >= dis.HAVE_ARGUMENT:
                oparg = ord(code[i]) + ord(code[i+1])*256
                i = i+2
            if op == LOAD_CONST:
                # An IMPORT_NAME is always preceded by a LOAD_CONST, it's
                # a tuple of "from" names, or None for a regular import.
                # The tuple may contain "*" for "from <mod> import *"
                fromlist = co.co_consts[oparg]
            elif op == IMPORT_NAME:
                assert fromlist is None or type(fromlist) is tuple
                name = co.co_names[oparg]
                have_star = 0
                if fromlist is not None:
                    if "*" in fromlist:
                        have_star = 1
                    fromlist = [f for f in fromlist if f != "*"]
                self._safe_import_hook(name, m, fromlist)
                if have_star:
                    # We've encountered an "import *". If it is a Python module,
                    # the code has already been parsed and we can suck out the
                    # global names.
                    mm = None
                    if m.__path__:
                        # At this point we don't know whether 'name' is a
                        # submodule of 'm' or a global module. Let's just try
                        # the full name first.
                        mm = self.modules.get(m.__name__ + "." + name)
                    if mm is None:
                        mm = self.modules.get(name)
                    if mm is not None:
                        m.globalnames.update(mm.globalnames)
                        m.starimports.update(mm.starimports)
                        if mm.__code__ is None:
                            m.starimports[name] = 1
                    else:
                        m.starimports[name] = 1
            elif op in STORE_OPS:
                # keep track of all global names that are assigned to
                name = co.co_names[oparg]
                m.globalnames[name] = 1
        for c in co.co_consts:
            if isinstance(c, type(co)):
                self.scan_code(c, m)

    def load_package(self, fqname, pathname):
        self.msgin(2, "load_package", fqname, pathname)
        newname = replacePackageMap.get(fqname)
        if newname:
            fqname = newname
        m = self.add_module(fqname)
        m.__file__ = pathname
        m.__path__ = [pathname]

        # As per comment at top of file, simulate runtime __path__ additions.
        m.__path__ = m.__path__ + packagePathMap.get(fqname, [])

        fp, buf, stuff = self.find_module("__init__", m.__path__)
        self.load_module(fqname, fp, buf, stuff)
        self.msgout(2, "load_package ->", m)
        return m

    def add_module(self, fqname):
        if self.modules.has_key(fqname):
            return self.modules[fqname]
        self.modules[fqname] = m = Module(fqname)
        return m

    def find_module(self, name, path, parent=None):
        if parent is not None:
            fullname = parent.__name__+'.'+name
        else:
            fullname = name
        if fullname in self.excludes:
            self.msgout(3, "find_module -> Excluded", fullname)
            raise ImportError, name

        if path is None:
            if name in sys.builtin_module_names:
                return (None, None, ("", "", imp.C_BUILTIN))

            path = self.path
        return imp.find_module(name, path)

    def report(self):
        """Print a report to stdout, listing the found modules with their
        paths, as well as modules that are missing, or seem to be missing.
        """
        print
        print "  %-25s %s" % ("Name", "File")
        print "  %-25s %s" % ("----", "----")
        # Print modules found
        keys = self.modules.keys()
        keys.sort()
        for key in keys:
            m = self.modules[key]
            if m.__path__:
                print "P",
            else:
                print "m",
            print "%-25s" % key, m.__file__ or ""

        # Print missing modules
        missing, maybe = self.any_missing_maybe()
        if missing:
            print
            print "Missing modules:"
            for name in missing:
                mods = self.badmodules[name].keys()
                mods.sort()
                print "?", name, "imported from", ', '.join(mods)
        # Print modules that may be missing, but then again, maybe not...
        if maybe:
            print
            print "Submodules thay appear to be missing, but could also be",
            print "global names in the parent package:"
            for name in maybe:
                mods = self.badmodules[name].keys()
                mods.sort()
                print "?", name, "imported from", ', '.join(mods)

    def any_missing(self):
        """Return a list of modules that appear to be missing. Use
        any_missing_maybe() if you want to know which modules are
        certain to be missing, and which *may* be missing.
        """
        missing, maybe = self.any_missing_maybe()
        return missing + maybe

    def any_missing_maybe(self):
        """Return two lists, one with modules that are certainly missing
        and one with modules that *may* be missing. The latter names could
        either be submodules *or* just global names in the package.

        The reason it can't always be determined is that it's impossible to
        tell which names are imported when "from module import *" is done
        with an extension module, short of actually importing it.
        """
        missing = []
        maybe = []
        for name in self.badmodules:
            if name in self.excludes:
                continue
            i = name.rfind(".")
            if i < 0:
                missing.append(name)
                continue
            subname = name[i+1:]
            pkgname = name[:i]
            pkg = self.modules.get(pkgname)
            if pkg is not None:
                if pkgname in self.badmodules[name]:
                    # The package tried to import this module itself and
                    # failed. It's definitely missing.
                    missing.append(name)
                elif subname in pkg.globalnames:
                    # It's a global in the package: definitely not missing.
                    pass
                elif pkg.starimports:
                    # It could be missing, but the package did an "import *"
                    # from a non-Python module, so we simply can't be sure.
                    maybe.append(name)
                else:
                    # It's not a global in the package, the package didn't
                    # do funny star imports, it's very likely to be missing.
                    # The symbol could be inserted into the package from the
                    # outside, but since that's not good style we simply list
                    # it missing.
                    missing.append(name)
            else:
                missing.append(name)
        missing.sort()
        maybe.sort()
        return missing, maybe

    def replace_paths_in_code(self, co):
        new_filename = original_filename = os.path.normpath(co.co_filename)
        for f, r in self.replace_paths:
            if original_filename.startswith(f):
                new_filename = r + original_filename[len(f):]
                break

        if self.debug and original_filename not in self.processed_paths:
            if new_filename != original_filename:
                self.msgout(2, "co_filename %r changed to %r" \
                                    % (original_filename,new_filename,))
            else:
                self.msgout(2, "co_filename %r remains unchanged" \
                                    % (original_filename,))
            self.processed_paths.append(original_filename)

        consts = list(co.co_consts)
        for i in range(len(consts)):
            if isinstance(consts[i], type(co)):
                consts[i] = self.replace_paths_in_code(consts[i])

        return new.code(co.co_argcount, co.co_nlocals, co.co_stacksize,
                         co.co_flags, co.co_code, tuple(consts), co.co_names,
                         co.co_varnames, new_filename, co.co_name,
                         co.co_firstlineno, co.co_lnotab,
                         co.co_freevars, co.co_cellvars)


def test():
    # Parse command line
    import getopt
    try:
        opts, args = getopt.getopt(sys.argv[1:], "dmp:qx:")
    except getopt.error, msg:
        print msg
        return

    # Process options
    debug = 1
    domods = 0
    addpath = []
    exclude = []
    for o, a in opts:
        if o == '-d':
            debug = debug + 1
        if o == '-m':
            domods = 1
        if o == '-p':
            addpath = addpath + a.split(os.pathsep)
        if o == '-q':
            debug = 0
        if o == '-x':
            exclude.append(a)

    # Provide default arguments
    if not args:
        script = "hello.py"
    else:
        script = args[0]

    # Set the path based on sys.path and the script directory
    path = sys.path[:]
    path[0] = os.path.dirname(script)
    path = addpath + path
    if debug > 1:
        print "path:"
        for item in path:
            print "   ", repr(item)

    # Create the module finder and turn its crank
    mf = ModuleFinder(path, debug, exclude)
    for arg in args[1:]:
        if arg == '-m':
            domods = 1
            continue
        if domods:
            if arg[-2:] == '.*':
                mf.import_hook(arg[:-2], None, ["*"])
            else:
                mf.import_hook(arg)
        else:
            mf.load_file(arg)
    mf.run_script(script)
    mf.report()
    return mf  # for -i debugging


if __name__ == '__main__':
    try:
        mf = test()
    except KeyboardInterrupt:
        print "\n[interrupt]"
Tip: Filter by directory path e.g. /media app.js to search for public/media/app.js.
Tip: Use camelCasing e.g. ProjME to search for ProjectModifiedEvent.java.
Tip: Filter by extension type e.g. /repo .js to search for all .js files in the /repo directory.
Tip: Separate your search with spaces e.g. /ssh pom.xml to search for src/ssh/pom.xml.
Tip: Use ↑ and ↓ arrow keys to navigate and return to view the file.
Tip: You can also navigate files with Ctrl+j (next) and Ctrl+k (previous) and view the file with Ctrl+o.
Tip: You can also navigate files with Alt+j (next) and Alt+k (previous) and view the file with Alt+o.