cpython/Tools/idle/IOBinding.py

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import os
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import types
import sys
import codecs
import re
import tempfile
import tkFileDialog
import tkMessageBox
from IdleConf import idleconf
#$ event <<open-window-from-file>>
#$ win <Control-o>
#$ unix <Control-x><Control-f>
#$ event <<save-window>>
#$ win <Control-s>
#$ unix <Control-x><Control-s>
#$ event <<save-window-as-file>>
#$ win <Alt-s>
#$ unix <Control-x><Control-w>
#$ event <<save-copy-of-window-as-file>>
#$ win <Alt-Shift-s>
#$ unix <Control-x><w>
#$ event <<print-window>>
#$ win <Control-p>
#$ unix <Control-x><Control-p>
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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:
pass
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)
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]
codecs.lookup(encoding)
except (ValueError, LookupError):
pass
encoding = encoding.lower()
coding_re = re.compile("coding[:=]\s*([-\w_.]+)")
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.__id_print = self.text.bind("<<print-window>>", self.print_window)
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self.fileencoding = None
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
def set_filename(self, filename):
self.filename = filename
self.set_saved(1)
if self.filename_change_hook:
self.filename_change_hook()
def open(self, event):
if self.editwin.flist:
filename = self.askopenfile()
if filename:
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"
filename = self.askopenfile()
if filename:
self.loadfile(filename)
else:
self.text.focus_set()
return "break"
def loadfile(self, filename):
try:
f = open(filename)
chars = f.read()
f.close()
except IOError, msg:
tkMessageBox.showerror("I/O Error", str(msg), master=self.text)
return False
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chars = self.decode(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.see("insert")
return True
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def decode(self, chars):
# Try to 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
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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")
m = tkMessageBox.Message(
title="Save On Close",
message=message,
icon=tkMessageBox.QUESTION,
type=tkMessageBox.YESNOCANCEL,
master=self.text)
reply = m.show()
if reply == "yes":
self.save(None)
if not self.get_saved():
reply = "cancel"
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(1)
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)
self.text.focus_set()
return "break"
def save_a_copy(self, event):
filename = self.asksavefile()
if filename:
self.writefile(filename)
self.text.focus_set()
return "break"
def print_window(self, event):
if self.get_saved():
filename = self.filename
else:
(tfd, tfn) = tempfile.mkstemp()
os.close(tfd)
filename = tfn
if not self.writefile(filename):
os.unlink(tfn)
return "break"
edconf = idleconf.getsection('EditorWindow')
command = edconf.get('print-command')
command = command % filename
if os.name == 'posix':
command = command + " 2>&1"
pipe = os.popen(command, "r")
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)
return "break"
def writefile(self, filename):
self.fixlastline()
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chars = self.encode(self.text.get("1.0", "end-1c"))
try:
f = open(filename, "w")
f.write(chars)
f.close()
## print "saved to", `filename`
return True
except IOError, msg:
tkMessageBox.showerror("I/O Error", str(msg),
master=self.text)
return False
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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.
try:
chars = chars.encode(encoding)
enc = encoding
except UnicodeError:
chars = BOM_UTF8 + chars.encode("utf-8")
enc = "utf-8"
tkMessageBox.showerror(
"I/O Error",
"Non-ASCII found, yet no encoding declared. Add a line like\n"
"# -*- coding: %s -*- \nto your file" % enc,
master = self.text)
return chars
def fixlastline(self):
c = self.text.get("end-2c")
if c != '\n':
self.text.insert("end-1c", "\n")
opendialog = None
savedialog = None
filetypes = [
("Python and text files", "*.py *.pyw *.txt", "TEXT"),
("All text files", "*", "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)
return self.opendialog.show(initialdir=dir, initialfile=base)
def defaultfilename(self, mode="open"):
if self.filename:
return os.path.split(self.filename)
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)
return self.savedialog.show(initialdir=dir, initialfile=base)
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__":
from Tkinter import *
test()