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Intercept <esc> avoid closing websocket on Firefox Closes #1031; closes #1032 (rebased and fixed tiny typo)

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Frontend class that uses IPython0 to prefilter the inputs.
Using the IPython0 mechanism gives us access to the magics.
This is a transitory class, used here to do the transition between
ipython0 and ipython1. This class is meant to be short-lived as more
functionnality is abstracted out of ipython0 in reusable functions and
is added on the interpreter. This class can be a used to guide this
# Copyright (C) 2008 The IPython Development Team
# Distributed under the terms of the BSD License. The full license is in
# the file COPYING, distributed as part of this software.
# Imports
import sys
import pydoc
import os
import re
import __builtin__
from IPython.core.iplib import InteractiveShell
from IPython.kernel.core.redirector_output_trap import RedirectorOutputTrap
from IPython.kernel.core.sync_traceback_trap import SyncTracebackTrap
import IPython.utils.io
from linefrontendbase import LineFrontEndBase, common_prefix
# Utility functions
def mk_system_call(system_call_function, command):
""" given a os.system replacement, and a leading string command,
returns a function that will execute the command with the given
argument string.
def my_system_call(args):
system_call_function("%s %s" % (command, args))
my_system_call.__doc__ = "Calls %s" % command
return my_system_call
# Frontend class using ipython0 to do the prefiltering.
class PrefilterFrontEnd(LineFrontEndBase):
""" Class that uses ipython0 to do prefilter the input, do the
completion and the magics.
The core trick is to use an ipython0 instance to prefilter the
input, and share the namespace between the interpreter instance used
to execute the statements and the ipython0 used for code
debug = False
def __init__(self, ipython0=None, *args, **kwargs):
""" Parameters
ipython0: an optional ipython0 instance to use for command
prefiltering and completion.
LineFrontEndBase.__init__(self, *args, **kwargs)
self.shell.output_trap = RedirectorOutputTrap(
self.shell.traceback_trap = SyncTracebackTrap(
# Start the ipython0 instance:
if ipython0 is None:
# Instanciate an IPython0 InteractiveShell to be able to use the
# prefiltering.
# Suppress all key input, to avoid waiting
def my_rawinput(x=None):
return '\n'
old_rawinput = __builtin__.raw_input
__builtin__.raw_input = my_rawinput
ipython0 = InteractiveShell(
parent=None, user_ns=self.shell.user_ns,
__builtin__.raw_input = old_rawinput
self.ipython0 = ipython0
# Set the pager:
lambda s, string: self.write("\n" + string))
self.ipython0.write = self.write
self._ip = _ip = self.ipython0
# Make sure the raw system call doesn't get called, as we don't
# have a stdin accessible.
self._ip.system = self.system_call
# XXX: Muck around with magics so that they work better
# in our environment
if not sys.platform.startswith('win'):
self.ipython0.magic_ls = mk_system_call(self.system_call,
'ls -CF')
# And now clean up the mess created by ipython0
if not 'banner' in kwargs and self.banner is None:
self.banner = self.ipython0.banner
# FIXME: __init__ and start should be two different steps
# FrontEndBase interface
def show_traceback(self):
""" Use ipython0 to capture the last traceback and display it.
# Don't do the capture; the except_hook has already done some
# modifications to the IO streams, if we store them, we'll be
# storing the wrong ones.
def execute(self, python_string, raw_string=None):
if self.debug:
print 'Executing Python code:', repr(python_string)
LineFrontEndBase.execute(self, python_string,
def save_output_hooks(self):
""" Store all the output hooks we can think of, to be able to
restore them.
We need to do this early, as starting the ipython0 instance will
screw ouput hooks.
self.__old_cout_write = Term.cout.write
self.__old_cerr_write = Term.cerr.write
self.__old_stdout = sys.stdout
self.__old_stderr= sys.stderr
self.__old_help_output = pydoc.help.output
self.__old_display_hook = sys.displayhook
def capture_output(self):
""" Capture all the output mechanisms we can think of.
Term.cout.write = self.write
Term.cerr.write = self.write
sys.stdout = Term.cout
sys.stderr = Term.cerr
pydoc.help.output = self.shell.output_trap.out
def release_output(self):
""" Release all the different captures we have made.
Term.cout.write = self.__old_cout_write
Term.cerr.write = self.__old_cerr_write
sys.stdout = self.__old_stdout
sys.stderr = self.__old_stderr
pydoc.help.output = self.__old_help_output
sys.displayhook = self.__old_display_hook
def complete(self, line):
# FIXME: This should be factored out in the linefrontendbase
# method.
word = self._get_completion_text(line)
completions = self.ipython0.complete(word)
# FIXME: The proper sort should be done in the complete method.
key = lambda x: x.replace('_', '')
if completions:
prefix = common_prefix(completions)
line = line[:-len(word)] + prefix
return line, completions
# LineFrontEndBase interface
def prefilter_input(self, input_string):
""" Using IPython0 to prefilter the commands to turn them
in executable statements that are valid Python strings.
input_string = LineFrontEndBase.prefilter_input(self, input_string)
filtered_lines = []
# The IPython0 prefilters sometime produce output. We need to
# capture it.
self.last_result = dict(number=self.prompt_number)
for line in input_string.split('\n'):
pf = self.ipython0.prefilter_manager.prefilter_lines
filtered_lines.append(pf(line, False).rstrip())
# XXX: probably not the right thing to do.
# Clean up the trailing whitespace, to avoid indentation errors
filtered_string = '\n'.join(filtered_lines)
return filtered_string
# PrefilterFrontEnd interface
def system_call(self, command_string):
""" Allows for frontend to define their own system call, to be
able capture output and redirect input.
return os.system(command_string)
def do_exit(self):
""" Exit the shell, cleanup and save the history.
def _get_completion_text(self, line):
""" Returns the text to be completed by breaking the line at specified
# Break at: spaces, '=', all parentheses (except if balanced).
# FIXME2: In the future, we need to make the implementation similar to
# that in the 'pyreadline' module (modes/basemode.py) where we break at
# each delimiter and try to complete the residual line, until we get a
# successful list of completions.
expression = '\s|=|,|:|\((?!.*\))|\[(?!.*\])|\{(?!.*\})'
complete_sep = re.compile(expression)
text = complete_sep.split(line)[-1]
return text