upstream/ipython Files · IPython/utils/ulinecache.py

Prevent qtconsole frontend freeze on lots of output....

Prevent qtconsole frontend freeze on lots of output. The output from the kernel is now clipped to last `buffer_size` before displaying and a timer is used to flush the pending output text instead of attempting to display text on every stream output from kernel. The timer interval is adjusted based on actual time taken to append a screenful of text to widget. This throttles the widget repaints and avoids choking the Qt event loop leaving time to handle other Qt events. Test cases: In [1]: for i in xrange(1000000): print i In [2]: range(100000) Without this commit the first input causes the qtconsole frontend to freeze, not responding to `Ctrl+C`.

Jörgen Stenarson - - Load All Authors

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             ulinecache.py
        
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      """Wrapper around linecache which decodes files to unicode according to PEP 263.

      This is only needed for Python 2 - linecache in Python 3 does the same thing

      itself.

      """

      import functools

      import linecache

      import sys

      from IPython.utils import py3compat

      from IPython.utils import openpy

      if py3compat.PY3:

          getline = linecache.getline

          # getlines has to be looked up at runtime, because doctests monkeypatch it.

          @functools.wraps(linecache.getlines)

          def getlines(filename, module_globals=None):

              return linecache.getlines(filename, module_globals=module_globals)

      else:

          def getlines(filename, module_globals=None):

              """Get the lines (as unicode) for a file from the cache.

              Update the cache if it doesn't contain an entry for this file already."""

              filename = py3compat.cast_bytes(filename, sys.getfilesystemencoding())

              lines = linecache.getlines(filename, module_globals=module_globals)

              # The bits we cache ourselves can be unicode.

              if (not lines) or isinstance(lines[0], unicode):

                  return lines

              readline = openpy._list_readline(lines)

              try:

                  encoding, _ = openpy.detect_encoding(readline)

              except SyntaxError:

                  encoding = 'ascii'

              return [l.decode(encoding, 'replace') for l in lines]

          # This is a straight copy of linecache.getline

          def getline(filename, lineno, module_globals=None):

              lines = getlines(filename, module_globals)

              if 1 <= lineno <= len(lines):

                  return lines[lineno-1]

              else:

                  return ''

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				"""Wrapper around linecache which decodes files to unicode according to PEP 263.

				This is only needed for Python 2 - linecache in Python 3 does the same thing
				itself.
				"""
				import functools
				import linecache
				import sys

				from IPython.utils import py3compat
				from IPython.utils import openpy

				if py3compat.PY3:
				getline = linecache.getline

				# getlines has to be looked up at runtime, because doctests monkeypatch it.
				@functools.wraps(linecache.getlines)
				def getlines(filename, module_globals=None):
				return linecache.getlines(filename, module_globals=module_globals)

				else:
				def getlines(filename, module_globals=None):
				"""Get the lines (as unicode) for a file from the cache.
				Update the cache if it doesn't contain an entry for this file already."""
				filename = py3compat.cast_bytes(filename, sys.getfilesystemencoding())
				lines = linecache.getlines(filename, module_globals=module_globals)

				# The bits we cache ourselves can be unicode.
				if (not lines) or isinstance(lines[0], unicode):
				return lines

				readline = openpy._list_readline(lines)
				try:
				encoding, _ = openpy.detect_encoding(readline)
				except SyntaxError:
				encoding = 'ascii'
				return [l.decode(encoding, 'replace') for l in lines]

				# This is a straight copy of linecache.getline
				def getline(filename, lineno, module_globals=None):
				lines = getlines(filename, module_globals)
				if 1 <= lineno <= len(lines):
				return lines[lineno-1]
				else:
				return ''