This file is indexed.

/usr/lib/python2.7/idlelib/IOBinding.py is in idle-python2.7 2.7.3-0ubuntu3.9.

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
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
592
593
594
# changes by dscherer@cmu.edu
#   - IOBinding.open() replaces the current window with the opened file,
#     if the current window is both unmodified and unnamed
#   - IOBinding.loadfile() interprets Windows, UNIX, and Macintosh
#     end-of-line conventions, instead of relying on the standard library,
#     which will only understand the local convention.

import os
import types
import sys
import codecs
import tempfile
import tkFileDialog
import tkMessageBox
import re
from Tkinter import *
from SimpleDialog import SimpleDialog

from idlelib.configHandler import idleConf

try:
    from codecs import BOM_UTF8
except ImportError:
    # only available since Python 2.3
    BOM_UTF8 = '\xef\xbb\xbf'

# Try setting the locale, so that we can find out
# what encoding to use
try:
    import locale
    locale.setlocale(locale.LC_CTYPE, "")
except (ImportError, locale.Error):
    pass

# Encoding for file names
filesystemencoding = sys.getfilesystemencoding()

encoding = "ascii"
if sys.platform == 'win32':
    # On Windows, we could use "mbcs". However, to give the user
    # a portable encoding name, we need to find the code page
    try:
        encoding = locale.getdefaultlocale()[1]
        codecs.lookup(encoding)
    except LookupError:
        pass
else:
    try:
        # Different things can fail here: the locale module may not be
        # loaded, it may not offer nl_langinfo, or CODESET, or the
        # resulting codeset may be unknown to Python. We ignore all
        # these problems, falling back to ASCII
        encoding = locale.nl_langinfo(locale.CODESET)
        if encoding is None or encoding is '':
            # situation occurs on Mac OS X
            encoding = 'ascii'
        codecs.lookup(encoding)
    except (NameError, AttributeError, LookupError):
        # Try getdefaultlocale well: it parses environment variables,
        # which may give a clue. Unfortunately, getdefaultlocale has
        # bugs that can cause ValueError.
        try:
            encoding = locale.getdefaultlocale()[1]
            if encoding is None or encoding is '':
                # situation occurs on Mac OS X
                encoding = 'ascii'
            codecs.lookup(encoding)
        except (ValueError, LookupError):
            pass

encoding = encoding.lower()

coding_re = re.compile("coding[:=]\s*([-\w_.]+)")

class EncodingMessage(SimpleDialog):
    "Inform user that an encoding declaration is needed."
    def __init__(self, master, enc):
        self.should_edit = False

        self.root = top = Toplevel(master)
        top.bind("<Return>", self.return_event)
        top.bind("<Escape>", self.do_ok)
        top.protocol("WM_DELETE_WINDOW", self.wm_delete_window)
        top.wm_title("I/O Warning")
        top.wm_iconname("I/O Warning")
        self.top = top

        l1 = Label(top,
            text="Non-ASCII found, yet no encoding declared. Add a line like")
        l1.pack(side=TOP, anchor=W)
        l2 = Entry(top, font="courier")
        l2.insert(0, "# -*- coding: %s -*-" % enc)
        # For some reason, the text is not selectable anymore if the
        # widget is disabled.
        # l2['state'] = DISABLED
        l2.pack(side=TOP, anchor = W, fill=X)
        l3 = Label(top, text="to your file\n"
                   "Choose OK to save this file as %s\n"
                   "Edit your general options to silence this warning" % enc)
        l3.pack(side=TOP, anchor = W)

        buttons = Frame(top)
        buttons.pack(side=TOP, fill=X)
        # Both return and cancel mean the same thing: do nothing
        self.default = self.cancel = 0
        b1 = Button(buttons, text="Ok", default="active",
                    command=self.do_ok)
        b1.pack(side=LEFT, fill=BOTH, expand=1)
        b2 = Button(buttons, text="Edit my file",
                    command=self.do_edit)
        b2.pack(side=LEFT, fill=BOTH, expand=1)

        self._set_transient(master)

    def do_ok(self):
        self.done(0)

    def do_edit(self):
        self.done(1)

def coding_spec(str):
    """Return the encoding declaration according to PEP 263.

    Raise LookupError if the encoding is declared but unknown.
    """
    # Only consider the first two lines
    str = str.split("\n")[:2]
    str = "\n".join(str)

    match = coding_re.search(str)
    if not match:
        return None
    name = match.group(1)
    # Check whether the encoding is known
    import codecs
    try:
        codecs.lookup(name)
    except LookupError:
        # The standard encoding error does not indicate the encoding
        raise LookupError, "Unknown encoding "+name
    return name


class IOBinding:

    def __init__(self, editwin):
        self.editwin = editwin
        self.text = editwin.text
        self.__id_open = self.text.bind("<<open-window-from-file>>", self.open)
        self.__id_save = self.text.bind("<<save-window>>", self.save)
        self.__id_saveas = self.text.bind("<<save-window-as-file>>",
                                          self.save_as)
        self.__id_savecopy = self.text.bind("<<save-copy-of-window-as-file>>",
                                            self.save_a_copy)
        self.fileencoding = None
        self.__id_print = self.text.bind("<<print-window>>", self.print_window)

    def close(self):
        # Undo command bindings
        self.text.unbind("<<open-window-from-file>>", self.__id_open)
        self.text.unbind("<<save-window>>", self.__id_save)
        self.text.unbind("<<save-window-as-file>>",self.__id_saveas)
        self.text.unbind("<<save-copy-of-window-as-file>>", self.__id_savecopy)
        self.text.unbind("<<print-window>>", self.__id_print)
        # Break cycles
        self.editwin = None
        self.text = None
        self.filename_change_hook = None

    def get_saved(self):
        return self.editwin.get_saved()

    def set_saved(self, flag):
        self.editwin.set_saved(flag)

    def reset_undo(self):
        self.editwin.reset_undo()

    filename_change_hook = None

    def set_filename_change_hook(self, hook):
        self.filename_change_hook = hook

    filename = None
    dirname = None

    def set_filename(self, filename):
        if filename and os.path.isdir(filename):
            self.filename = None
            self.dirname = filename
        else:
            self.filename = filename
            self.dirname = None
            self.set_saved(1)
            if self.filename_change_hook:
                self.filename_change_hook()

    def open(self, event=None, editFile=None):
        if self.editwin.flist:
            if not editFile:
                filename = self.askopenfile()
            else:
                filename=editFile
            if filename:
                # If the current window has no filename and hasn't been
                # modified, we replace its contents (no loss).  Otherwise
                # we open a new window.  But we won't replace the
                # shell window (which has an interp(reter) attribute), which
                # gets set to "not modified" at every new prompt.
                try:
                    interp = self.editwin.interp
                except AttributeError:
                    interp = None
                if not self.filename and self.get_saved() and not interp:
                    self.editwin.flist.open(filename, self.loadfile)
                else:
                    self.editwin.flist.open(filename)
            else:
                self.text.focus_set()
            return "break"
        #
        # Code for use outside IDLE:
        if self.get_saved():
            reply = self.maybesave()
            if reply == "cancel":
                self.text.focus_set()
                return "break"
        if not editFile:
            filename = self.askopenfile()
        else:
            filename=editFile
        if filename:
            self.loadfile(filename)
        else:
            self.text.focus_set()
        return "break"

    eol = r"(\r\n)|\n|\r"  # \r\n (Windows), \n (UNIX), or \r (Mac)
    eol_re = re.compile(eol)
    eol_convention = os.linesep # Default

    def loadfile(self, filename):
        try:
            # open the file in binary mode so that we can handle
            #   end-of-line convention ourselves.
            f = open(filename,'rb')
            chars = f.read()
            f.close()
        except IOError, msg:
            tkMessageBox.showerror("I/O Error", str(msg), master=self.text)
            return False

        chars = self.decode(chars)
        # We now convert all end-of-lines to '\n's
        firsteol = self.eol_re.search(chars)
        if firsteol:
            self.eol_convention = firsteol.group(0)
            if isinstance(self.eol_convention, unicode):
                # Make sure it is an ASCII string
                self.eol_convention = self.eol_convention.encode("ascii")
            chars = self.eol_re.sub(r"\n", chars)

        self.text.delete("1.0", "end")
        self.set_filename(None)
        self.text.insert("1.0", chars)
        self.reset_undo()
        self.set_filename(filename)
        self.text.mark_set("insert", "1.0")
        self.text.yview("insert")
        self.updaterecentfileslist(filename)
        return True

    def decode(self, chars):
        """Create a Unicode string

        If that fails, let Tcl try its best
        """
        # Check presence of a UTF-8 signature first
        if chars.startswith(BOM_UTF8):
            try:
                chars = chars[3:].decode("utf-8")
            except UnicodeError:
                # has UTF-8 signature, but fails to decode...
                return chars
            else:
                # Indicates that this file originally had a BOM
                self.fileencoding = BOM_UTF8
                return chars
        # Next look for coding specification
        try:
            enc = coding_spec(chars)
        except LookupError, name:
            tkMessageBox.showerror(
                title="Error loading the file",
                message="The encoding '%s' is not known to this Python "\
                "installation. The file may not display correctly" % name,
                master = self.text)
            enc = None
        if enc:
            try:
                return unicode(chars, enc)
            except UnicodeError:
                pass
        # If it is ASCII, we need not to record anything
        try:
            return unicode(chars, 'ascii')
        except UnicodeError:
            pass
        # Finally, try the locale's encoding. This is deprecated;
        # the user should declare a non-ASCII encoding
        try:
            chars = unicode(chars, encoding)
            self.fileencoding = encoding
        except UnicodeError:
            pass
        return chars

    def maybesave(self):
        if self.get_saved():
            return "yes"
        message = "Do you want to save %s before closing?" % (
            self.filename or "this untitled document")
        confirm = tkMessageBox.askyesnocancel(
                  title="Save On Close",
                  message=message,
                  default=tkMessageBox.YES,
                  master=self.text)
        if confirm:
            reply = "yes"
            self.save(None)
            if not self.get_saved():
                reply = "cancel"
        elif confirm is None:
            reply = "cancel"
        else:
            reply = "no"
        self.text.focus_set()
        return reply

    def save(self, event):
        if not self.filename:
            self.save_as(event)
        else:
            if self.writefile(self.filename):
                self.set_saved(True)
                try:
                    self.editwin.store_file_breaks()
                except AttributeError:  # may be a PyShell
                    pass
        self.text.focus_set()
        return "break"

    def save_as(self, event):
        filename = self.asksavefile()
        if filename:
            if self.writefile(filename):
                self.set_filename(filename)
                self.set_saved(1)
                try:
                    self.editwin.store_file_breaks()
                except AttributeError:
                    pass
        self.text.focus_set()
        self.updaterecentfileslist(filename)
        return "break"

    def save_a_copy(self, event):
        filename = self.asksavefile()
        if filename:
            self.writefile(filename)
        self.text.focus_set()
        self.updaterecentfileslist(filename)
        return "break"

    def writefile(self, filename):
        self.fixlastline()
        chars = self.encode(self.text.get("1.0", "end-1c"))
        if self.eol_convention != "\n":
            chars = chars.replace("\n", self.eol_convention)
        try:
            f = open(filename, "wb")
            f.write(chars)
            f.flush()
            f.close()
            return True
        except IOError, msg:
            tkMessageBox.showerror("I/O Error", str(msg),
                                   master=self.text)
            return False

    def encode(self, chars):
        if isinstance(chars, types.StringType):
            # This is either plain ASCII, or Tk was returning mixed-encoding
            # text to us. Don't try to guess further.
            return chars
        # See whether there is anything non-ASCII in it.
        # If not, no need to figure out the encoding.
        try:
            return chars.encode('ascii')
        except UnicodeError:
            pass
        # If there is an encoding declared, try this first.
        try:
            enc = coding_spec(chars)
            failed = None
        except LookupError, msg:
            failed = msg
            enc = None
        if enc:
            try:
                return chars.encode(enc)
            except UnicodeError:
                failed = "Invalid encoding '%s'" % enc
        if failed:
            tkMessageBox.showerror(
                "I/O Error",
                "%s. Saving as UTF-8" % failed,
                master = self.text)
        # If there was a UTF-8 signature, use that. This should not fail
        if self.fileencoding == BOM_UTF8 or failed:
            return BOM_UTF8 + chars.encode("utf-8")
        # Try the original file encoding next, if any
        if self.fileencoding:
            try:
                return chars.encode(self.fileencoding)
            except UnicodeError:
                tkMessageBox.showerror(
                    "I/O Error",
                    "Cannot save this as '%s' anymore. Saving as UTF-8" \
                    % self.fileencoding,
                    master = self.text)
                return BOM_UTF8 + chars.encode("utf-8")
        # Nothing was declared, and we had not determined an encoding
        # on loading. Recommend an encoding line.
        config_encoding = idleConf.GetOption("main","EditorWindow",
                                             "encoding")
        if config_encoding == 'utf-8':
            # User has requested that we save files as UTF-8
            return BOM_UTF8 + chars.encode("utf-8")
        ask_user = True
        try:
            chars = chars.encode(encoding)
            enc = encoding
            if config_encoding == 'locale':
                ask_user = False
        except UnicodeError:
            chars = BOM_UTF8 + chars.encode("utf-8")
            enc = "utf-8"
        if not ask_user:
            return chars
        dialog = EncodingMessage(self.editwin.top, enc)
        dialog.go()
        if dialog.num == 1:
            # User asked us to edit the file
            encline = "# -*- coding: %s -*-\n" % enc
            firstline = self.text.get("1.0", "2.0")
            if firstline.startswith("#!"):
                # Insert encoding after #! line
                self.text.insert("2.0", encline)
            else:
                self.text.insert("1.0", encline)
            return self.encode(self.text.get("1.0", "end-1c"))
        return chars

    def fixlastline(self):
        c = self.text.get("end-2c")
        if c != '\n':
            self.text.insert("end-1c", "\n")

    def print_window(self, event):
        confirm = tkMessageBox.askokcancel(
                  title="Print",
                  message="Print to Default Printer",
                  default=tkMessageBox.OK,
                  master=self.text)
        if not confirm:
            self.text.focus_set()
            return "break"
        tempfilename = None
        saved = self.get_saved()
        if saved:
            filename = self.filename
        # shell undo is reset after every prompt, looks saved, probably isn't
        if not saved or filename is None:
            (tfd, tempfilename) = tempfile.mkstemp(prefix='IDLE_tmp_')
            filename = tempfilename
            os.close(tfd)
            if not self.writefile(tempfilename):
                os.unlink(tempfilename)
                return "break"
        platform = os.name
        printPlatform = True
        if platform == 'posix': #posix platform
            command = idleConf.GetOption('main','General',
                                         'print-command-posix')
            command = command + " 2>&1"
        elif platform == 'nt': #win32 platform
            command = idleConf.GetOption('main','General','print-command-win')
        else: #no printing for this platform
            printPlatform = False
        if printPlatform:  #we can try to print for this platform
            command = command % filename
            pipe = os.popen(command, "r")
            # things can get ugly on NT if there is no printer available.
            output = pipe.read().strip()
            status = pipe.close()
            if status:
                output = "Printing failed (exit status 0x%x)\n" % \
                         status + output
            if output:
                output = "Printing command: %s\n" % repr(command) + output
                tkMessageBox.showerror("Print status", output, master=self.text)
        else:  #no printing for this platform
            message = "Printing is not enabled for this platform: %s" % platform
            tkMessageBox.showinfo("Print status", message, master=self.text)
        if tempfilename:
            os.unlink(tempfilename)
        return "break"

    opendialog = None
    savedialog = None

    filetypes = [
        ("Python files", "*.py *.pyw", "TEXT"),
        ("Text files", "*.txt", "TEXT"),
        ("All files", "*"),
        ]

    def askopenfile(self):
        dir, base = self.defaultfilename("open")
        if not self.opendialog:
            self.opendialog = tkFileDialog.Open(master=self.text,
                                                filetypes=self.filetypes)
        filename = self.opendialog.show(initialdir=dir, initialfile=base)
        if isinstance(filename, unicode):
            filename = filename.encode(filesystemencoding)
        return filename

    def defaultfilename(self, mode="open"):
        if self.filename:
            return os.path.split(self.filename)
        elif self.dirname:
            return self.dirname, ""
        else:
            try:
                pwd = os.getcwd()
            except os.error:
                pwd = ""
            return pwd, ""

    def asksavefile(self):
        dir, base = self.defaultfilename("save")
        if not self.savedialog:
            self.savedialog = tkFileDialog.SaveAs(master=self.text,
                                                  filetypes=self.filetypes)
        filename = self.savedialog.show(initialdir=dir, initialfile=base)
        if isinstance(filename, unicode):
            filename = filename.encode(filesystemencoding)
        return filename

    def updaterecentfileslist(self,filename):
        "Update recent file list on all editor windows"
        self.editwin.update_recent_files_list(filename)

def test():
    root = Tk()
    class MyEditWin:
        def __init__(self, text):
            self.text = text
            self.flist = None
            self.text.bind("<Control-o>", self.open)
            self.text.bind("<Control-s>", self.save)
            self.text.bind("<Alt-s>", self.save_as)
            self.text.bind("<Alt-z>", self.save_a_copy)
        def get_saved(self): return 0
        def set_saved(self, flag): pass
        def reset_undo(self): pass
        def open(self, event):
            self.text.event_generate("<<open-window-from-file>>")
        def save(self, event):
            self.text.event_generate("<<save-window>>")
        def save_as(self, event):
            self.text.event_generate("<<save-window-as-file>>")
        def save_a_copy(self, event):
            self.text.event_generate("<<save-copy-of-window-as-file>>")
    text = Text(root)
    text.pack()
    text.focus_set()
    editwin = MyEditWin(text)
    io = IOBinding(editwin)
    root.mainloop()

if __name__ == "__main__":
    test()