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"""Frontend widget for the Qt Console"""
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# Copyright (c) IPython Development Team.
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# Distributed under the terms of the Modified BSD License.
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from __future__ import print_function
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from collections import namedtuple
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import sys
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import uuid
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from IPython.external import qt
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from IPython.external.qt import QtCore, QtGui
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from IPython.utils import py3compat
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from IPython.utils.importstring import import_item
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from IPython.core.inputsplitter import InputSplitter, IPythonInputSplitter
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from IPython.core.inputtransformer import classic_prompt
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from IPython.core.oinspect import call_tip
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from IPython.qt.base_frontend_mixin import BaseFrontendMixin
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from IPython.utils.traitlets import Any, Bool, Instance, Unicode, DottedObjectName
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from .bracket_matcher import BracketMatcher
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from .call_tip_widget import CallTipWidget
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from .history_console_widget import HistoryConsoleWidget
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from .pygments_highlighter import PygmentsHighlighter
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class FrontendHighlighter(PygmentsHighlighter):
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""" A PygmentsHighlighter that understands and ignores prompts.
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"""
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def __init__(self, frontend, lexer=None):
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super(FrontendHighlighter, self).__init__(frontend._control.document(), lexer=lexer)
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self._current_offset = 0
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self._frontend = frontend
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self.highlighting_on = False
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def highlightBlock(self, string):
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""" Highlight a block of text. Reimplemented to highlight selectively.
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"""
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if not self.highlighting_on:
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return
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# The input to this function is a unicode string that may contain
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# paragraph break characters, non-breaking spaces, etc. Here we acquire
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# the string as plain text so we can compare it.
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current_block = self.currentBlock()
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string = self._frontend._get_block_plain_text(current_block)
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# Decide whether to check for the regular or continuation prompt.
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if current_block.contains(self._frontend._prompt_pos):
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prompt = self._frontend._prompt
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else:
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prompt = self._frontend._continuation_prompt
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# Only highlight if we can identify a prompt, but make sure not to
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# highlight the prompt.
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if string.startswith(prompt):
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self._current_offset = len(prompt)
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string = string[len(prompt):]
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super(FrontendHighlighter, self).highlightBlock(string)
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def rehighlightBlock(self, block):
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""" Reimplemented to temporarily enable highlighting if disabled.
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"""
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old = self.highlighting_on
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self.highlighting_on = True
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super(FrontendHighlighter, self).rehighlightBlock(block)
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self.highlighting_on = old
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def setFormat(self, start, count, format):
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""" Reimplemented to highlight selectively.
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"""
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start += self._current_offset
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super(FrontendHighlighter, self).setFormat(start, count, format)
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class FrontendWidget(HistoryConsoleWidget, BaseFrontendMixin):
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""" A Qt frontend for a generic Python kernel.
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"""
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# The text to show when the kernel is (re)started.
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banner = Unicode(config=True)
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kernel_banner = Unicode()
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# Whether to show the banner
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_display_banner = Bool(False)
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# An option and corresponding signal for overriding the default kernel
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# interrupt behavior.
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custom_interrupt = Bool(False)
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custom_interrupt_requested = QtCore.Signal()
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# An option and corresponding signals for overriding the default kernel
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# restart behavior.
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custom_restart = Bool(False)
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custom_restart_kernel_died = QtCore.Signal(float)
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custom_restart_requested = QtCore.Signal()
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# Whether to automatically show calltips on open-parentheses.
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enable_calltips = Bool(True, config=True,
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help="Whether to draw information calltips on open-parentheses.")
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clear_on_kernel_restart = Bool(True, config=True,
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help="Whether to clear the console when the kernel is restarted")
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confirm_restart = Bool(True, config=True,
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help="Whether to ask for user confirmation when restarting kernel")
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lexer_class = DottedObjectName(config=True,
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help="The pygments lexer class to use."
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)
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def _lexer_class_changed(self, name, old, new):
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lexer_class = import_item(new)
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self.lexer = lexer_class()
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def _lexer_class_default(self):
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if py3compat.PY3:
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return 'pygments.lexers.Python3Lexer'
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else:
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return 'pygments.lexers.PythonLexer'
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lexer = Any()
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def _lexer_default(self):
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lexer_class = import_item(self.lexer_class)
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return lexer_class()
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# Emitted when a user visible 'execute_request' has been submitted to the
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# kernel from the FrontendWidget. Contains the code to be executed.
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executing = QtCore.Signal(object)
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# Emitted when a user-visible 'execute_reply' has been received from the
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# kernel and processed by the FrontendWidget. Contains the response message.
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executed = QtCore.Signal(object)
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# Emitted when an exit request has been received from the kernel.
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exit_requested = QtCore.Signal(object)
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# Protected class variables.
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_prompt_transformer = IPythonInputSplitter(physical_line_transforms=[classic_prompt()],
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logical_line_transforms=[],
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python_line_transforms=[],
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)
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_CallTipRequest = namedtuple('_CallTipRequest', ['id', 'pos'])
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_CompletionRequest = namedtuple('_CompletionRequest', ['id', 'pos'])
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_ExecutionRequest = namedtuple('_ExecutionRequest', ['id', 'kind'])
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_input_splitter_class = InputSplitter
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_local_kernel = False
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_highlighter = Instance(FrontendHighlighter)
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#---------------------------------------------------------------------------
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# 'object' interface
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#---------------------------------------------------------------------------
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def __init__(self, *args, **kw):
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super(FrontendWidget, self).__init__(*args, **kw)
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# FIXME: remove this when PySide min version is updated past 1.0.7
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# forcefully disable calltips if PySide is < 1.0.7, because they crash
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if qt.QT_API == qt.QT_API_PYSIDE:
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import PySide
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if PySide.__version_info__ < (1,0,7):
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self.log.warn("PySide %s < 1.0.7 detected, disabling calltips" % PySide.__version__)
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self.enable_calltips = False
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# FrontendWidget protected variables.
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self._bracket_matcher = BracketMatcher(self._control)
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self._call_tip_widget = CallTipWidget(self._control)
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self._copy_raw_action = QtGui.QAction('Copy (Raw Text)', None)
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self._hidden = False
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self._highlighter = FrontendHighlighter(self, lexer=self.lexer)
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self._input_splitter = self._input_splitter_class()
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self._kernel_manager = None
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self._kernel_client = None
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self._request_info = {}
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self._request_info['execute'] = {};
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self._callback_dict = {}
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self._display_banner = True
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# Configure the ConsoleWidget.
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self.tab_width = 4
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self._set_continuation_prompt('... ')
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# Configure the CallTipWidget.
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self._call_tip_widget.setFont(self.font)
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self.font_changed.connect(self._call_tip_widget.setFont)
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# Configure actions.
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action = self._copy_raw_action
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key = QtCore.Qt.CTRL | QtCore.Qt.SHIFT | QtCore.Qt.Key_C
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action.setEnabled(False)
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action.setShortcut(QtGui.QKeySequence(key))
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action.setShortcutContext(QtCore.Qt.WidgetWithChildrenShortcut)
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action.triggered.connect(self.copy_raw)
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self.copy_available.connect(action.setEnabled)
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self.addAction(action)
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# Connect signal handlers.
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document = self._control.document()
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document.contentsChange.connect(self._document_contents_change)
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# Set flag for whether we are connected via localhost.
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self._local_kernel = kw.get('local_kernel',
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FrontendWidget._local_kernel)
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# Whether or not a clear_output call is pending new output.
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self._pending_clearoutput = False
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#---------------------------------------------------------------------------
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# 'ConsoleWidget' public interface
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#---------------------------------------------------------------------------
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def copy(self):
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""" Copy the currently selected text to the clipboard, removing prompts.
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"""
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if self._page_control is not None and self._page_control.hasFocus():
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self._page_control.copy()
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elif self._control.hasFocus():
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text = self._control.textCursor().selection().toPlainText()
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if text:
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was_newline = text[-1] == '\n'
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text = self._prompt_transformer.transform_cell(text)
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if not was_newline: # user doesn't need newline
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text = text[:-1]
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QtGui.QApplication.clipboard().setText(text)
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else:
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self.log.debug("frontend widget : unknown copy target")
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#---------------------------------------------------------------------------
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# 'ConsoleWidget' abstract interface
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#---------------------------------------------------------------------------
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def _is_complete(self, source, interactive):
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""" Returns whether 'source' can be completely processed and a new
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prompt created. When triggered by an Enter/Return key press,
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'interactive' is True; otherwise, it is False.
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"""
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self._input_splitter.reset()
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try:
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complete = self._input_splitter.push(source)
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except SyntaxError:
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return True
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if interactive:
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complete = not self._input_splitter.push_accepts_more()
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return complete
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def _execute(self, source, hidden):
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""" Execute 'source'. If 'hidden', do not show any output.
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See parent class :meth:`execute` docstring for full details.
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"""
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msg_id = self.kernel_client.execute(source, hidden)
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self._request_info['execute'][msg_id] = self._ExecutionRequest(msg_id, 'user')
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self._hidden = hidden
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if not hidden:
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self.executing.emit(source)
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def _prompt_started_hook(self):
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""" Called immediately after a new prompt is displayed.
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"""
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if not self._reading:
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self._highlighter.highlighting_on = True
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def _prompt_finished_hook(self):
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""" Called immediately after a prompt is finished, i.e. when some input
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will be processed and a new prompt displayed.
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"""
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# Flush all state from the input splitter so the next round of
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# reading input starts with a clean buffer.
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self._input_splitter.reset()
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if not self._reading:
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self._highlighter.highlighting_on = False
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def _tab_pressed(self):
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""" Called when the tab key is pressed. Returns whether to continue
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processing the event.
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"""
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# Perform tab completion if:
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# 1) The cursor is in the input buffer.
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# 2) There is a non-whitespace character before the cursor.
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text = self._get_input_buffer_cursor_line()
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if text is None:
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return False
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complete = bool(text[:self._get_input_buffer_cursor_column()].strip())
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if complete:
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self._complete()
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return not complete
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#---------------------------------------------------------------------------
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# 'ConsoleWidget' protected interface
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#---------------------------------------------------------------------------
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def _context_menu_make(self, pos):
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""" Reimplemented to add an action for raw copy.
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"""
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menu = super(FrontendWidget, self)._context_menu_make(pos)
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for before_action in menu.actions():
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if before_action.shortcut().matches(QtGui.QKeySequence.Paste) == \
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QtGui.QKeySequence.ExactMatch:
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menu.insertAction(before_action, self._copy_raw_action)
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break
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return menu
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def request_interrupt_kernel(self):
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if self._executing:
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self.interrupt_kernel()
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def request_restart_kernel(self):
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message = 'Are you sure you want to restart the kernel?'
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self.restart_kernel(message, now=False)
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def _event_filter_console_keypress(self, event):
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""" Reimplemented for execution interruption and smart backspace.
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"""
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key = event.key()
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if self._control_key_down(event.modifiers(), include_command=False):
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if key == QtCore.Qt.Key_C and self._executing:
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self.request_interrupt_kernel()
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return True
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elif key == QtCore.Qt.Key_Period:
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self.request_restart_kernel()
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return True
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elif not event.modifiers() & QtCore.Qt.AltModifier:
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# Smart backspace: remove four characters in one backspace if:
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# 1) everything left of the cursor is whitespace
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# 2) the four characters immediately left of the cursor are spaces
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if key == QtCore.Qt.Key_Backspace:
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col = self._get_input_buffer_cursor_column()
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cursor = self._control.textCursor()
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if col > 3 and not cursor.hasSelection():
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text = self._get_input_buffer_cursor_line()[:col]
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if text.endswith(' ') and not text.strip():
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cursor.movePosition(QtGui.QTextCursor.Left,
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QtGui.QTextCursor.KeepAnchor, 4)
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cursor.removeSelectedText()
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return True
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return super(FrontendWidget, self)._event_filter_console_keypress(event)
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def _insert_continuation_prompt(self, cursor):
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""" Reimplemented for auto-indentation.
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"""
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super(FrontendWidget, self)._insert_continuation_prompt(cursor)
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cursor.insertText(' ' * self._input_splitter.indent_spaces)
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#---------------------------------------------------------------------------
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# 'BaseFrontendMixin' abstract interface
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#---------------------------------------------------------------------------
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def _handle_clear_output(self, msg):
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"""Handle clear output messages."""
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if include_output(msg):
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wait = msg['content'].get('wait', True)
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if wait:
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self._pending_clearoutput = True
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else:
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self.clear_output()
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def _silent_exec_callback(self, expr, callback):
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"""Silently execute `expr` in the kernel and call `callback` with reply
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the `expr` is evaluated silently in the kernel (without) output in
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the frontend. Call `callback` with the
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`repr <http://docs.python.org/library/functions.html#repr> `_ as first argument
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Parameters
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----------
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expr : string
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valid string to be executed by the kernel.
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callback : function
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function accepting one argument, as a string. The string will be
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the `repr` of the result of evaluating `expr`
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The `callback` is called with the `repr()` of the result of `expr` as
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first argument. To get the object, do `eval()` on the passed value.
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See Also
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--------
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_handle_exec_callback : private method, deal with calling callback with reply
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"""
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# generate uuid, which would be used as an indication of whether or
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# not the unique request originated from here (can use msg id ?)
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local_uuid = str(uuid.uuid1())
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msg_id = self.kernel_client.execute('',
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silent=True, user_expressions={ local_uuid:expr })
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self._callback_dict[local_uuid] = callback
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self._request_info['execute'][msg_id] = self._ExecutionRequest(msg_id, 'silent_exec_callback')
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def _handle_exec_callback(self, msg):
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"""Execute `callback` corresponding to `msg` reply, after ``_silent_exec_callback``
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Parameters
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----------
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msg : raw message send by the kernel containing an `user_expressions`
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and having a 'silent_exec_callback' kind.
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Notes
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-----
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This function will look for a `callback` associated with the
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corresponding message id. Association has been made by
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`_silent_exec_callback`. `callback` is then called with the `repr()`
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of the value of corresponding `user_expressions` as argument.
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`callback` is then removed from the known list so that any message
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coming again with the same id won't trigger it.
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"""
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user_exp = msg['content'].get('user_expressions')
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if not user_exp:
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return
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for expression in user_exp:
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if expression in self._callback_dict:
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self._callback_dict.pop(expression)(user_exp[expression])
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def _handle_execute_reply(self, msg):
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""" Handles replies for code execution.
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"""
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self.log.debug("execute: %s", msg.get('content', ''))
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msg_id = msg['parent_header']['msg_id']
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info = self._request_info['execute'].get(msg_id)
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# unset reading flag, because if execute finished, raw_input can't
|
|
|
# still be pending.
|
|
|
self._reading = False
|
|
|
if info and info.kind == 'user' and not self._hidden:
|
|
|
# Make sure that all output from the SUB channel has been processed
|
|
|
# before writing a new prompt.
|
|
|
self.kernel_client.iopub_channel.flush()
|
|
|
|
|
|
# Reset the ANSI style information to prevent bad text in stdout
|
|
|
# from messing up our colors. We're not a true terminal so we're
|
|
|
# allowed to do this.
|
|
|
if self.ansi_codes:
|
|
|
self._ansi_processor.reset_sgr()
|
|
|
|
|
|
content = msg['content']
|
|
|
status = content['status']
|
|
|
if status == 'ok':
|
|
|
self._process_execute_ok(msg)
|
|
|
elif status == 'error':
|
|
|
self._process_execute_error(msg)
|
|
|
elif status == 'aborted':
|
|
|
self._process_execute_abort(msg)
|
|
|
|
|
|
self._show_interpreter_prompt_for_reply(msg)
|
|
|
self.executed.emit(msg)
|
|
|
self._request_info['execute'].pop(msg_id)
|
|
|
elif info and info.kind == 'silent_exec_callback' and not self._hidden:
|
|
|
self._handle_exec_callback(msg)
|
|
|
self._request_info['execute'].pop(msg_id)
|
|
|
else:
|
|
|
super(FrontendWidget, self)._handle_execute_reply(msg)
|
|
|
|
|
|
def _handle_input_request(self, msg):
|
|
|
""" Handle requests for raw_input.
|
|
|
"""
|
|
|
self.log.debug("input: %s", msg.get('content', ''))
|
|
|
if self._hidden:
|
|
|
raise RuntimeError('Request for raw input during hidden execution.')
|
|
|
|
|
|
# Make sure that all output from the SUB channel has been processed
|
|
|
# before entering readline mode.
|
|
|
self.kernel_client.iopub_channel.flush()
|
|
|
|
|
|
def callback(line):
|
|
|
self.kernel_client.input(line)
|
|
|
if self._reading:
|
|
|
self.log.debug("Got second input request, assuming first was interrupted.")
|
|
|
self._reading = False
|
|
|
self._readline(msg['content']['prompt'], callback=callback)
|
|
|
|
|
|
def _kernel_restarted_message(self, died=True):
|
|
|
msg = "Kernel died, restarting" if died else "Kernel restarting"
|
|
|
self._append_html("<br>%s<hr><br>" % msg,
|
|
|
before_prompt=False
|
|
|
)
|
|
|
|
|
|
def _handle_kernel_died(self, since_last_heartbeat):
|
|
|
"""Handle the kernel's death (if we do not own the kernel).
|
|
|
"""
|
|
|
self.log.warn("kernel died: %s", since_last_heartbeat)
|
|
|
if self.custom_restart:
|
|
|
self.custom_restart_kernel_died.emit(since_last_heartbeat)
|
|
|
else:
|
|
|
self._kernel_restarted_message(died=True)
|
|
|
self.reset()
|
|
|
|
|
|
def _handle_kernel_restarted(self, died=True):
|
|
|
"""Notice that the autorestarter restarted the kernel.
|
|
|
|
|
|
There's nothing to do but show a message.
|
|
|
"""
|
|
|
self.log.warn("kernel restarted")
|
|
|
self._kernel_restarted_message(died=died)
|
|
|
self.reset()
|
|
|
|
|
|
def _handle_inspect_reply(self, rep):
|
|
|
"""Handle replies for call tips."""
|
|
|
self.log.debug("oinfo: %s", rep.get('content', ''))
|
|
|
cursor = self._get_cursor()
|
|
|
info = self._request_info.get('call_tip')
|
|
|
if info and info.id == rep['parent_header']['msg_id'] and \
|
|
|
info.pos == cursor.position():
|
|
|
content = rep['content']
|
|
|
if content.get('status') == 'ok' and content.get('found', False):
|
|
|
self._call_tip_widget.show_inspect_data(content)
|
|
|
|
|
|
def _handle_execute_result(self, msg):
|
|
|
""" Handle display hook output.
|
|
|
"""
|
|
|
self.log.debug("execute_result: %s", msg.get('content', ''))
|
|
|
if self.include_output(msg):
|
|
|
self.flush_clearoutput()
|
|
|
text = msg['content']['data']
|
|
|
self._append_plain_text(text + '\n', before_prompt=True)
|
|
|
|
|
|
def _handle_stream(self, msg):
|
|
|
""" Handle stdout, stderr, and stdin.
|
|
|
"""
|
|
|
self.log.debug("stream: %s", msg.get('content', ''))
|
|
|
if self.include_output(msg):
|
|
|
self.flush_clearoutput()
|
|
|
self.append_stream(msg['content']['text'])
|
|
|
|
|
|
def _handle_shutdown_reply(self, msg):
|
|
|
""" Handle shutdown signal, only if from other console.
|
|
|
"""
|
|
|
self.log.info("shutdown: %s", msg.get('content', ''))
|
|
|
restart = msg.get('content', {}).get('restart', False)
|
|
|
if not self._hidden and not self.from_here(msg):
|
|
|
# got shutdown reply, request came from session other than ours
|
|
|
if restart:
|
|
|
# someone restarted the kernel, handle it
|
|
|
self._handle_kernel_restarted(died=False)
|
|
|
else:
|
|
|
# kernel was shutdown permanently
|
|
|
# this triggers exit_requested if the kernel was local,
|
|
|
# and a dialog if the kernel was remote,
|
|
|
# so we don't suddenly clear the qtconsole without asking.
|
|
|
if self._local_kernel:
|
|
|
self.exit_requested.emit(self)
|
|
|
else:
|
|
|
title = self.window().windowTitle()
|
|
|
reply = QtGui.QMessageBox.question(self, title,
|
|
|
"Kernel has been shutdown permanently. "
|
|
|
"Close the Console?",
|
|
|
QtGui.QMessageBox.Yes,QtGui.QMessageBox.No)
|
|
|
if reply == QtGui.QMessageBox.Yes:
|
|
|
self.exit_requested.emit(self)
|
|
|
|
|
|
def _handle_status(self, msg):
|
|
|
"""Handle status message"""
|
|
|
# This is where a busy/idle indicator would be triggered,
|
|
|
# when we make one.
|
|
|
state = msg['content'].get('execution_state', '')
|
|
|
if state == 'starting':
|
|
|
# kernel started while we were running
|
|
|
if self._executing:
|
|
|
self._handle_kernel_restarted(died=True)
|
|
|
elif state == 'idle':
|
|
|
pass
|
|
|
elif state == 'busy':
|
|
|
pass
|
|
|
|
|
|
def _started_channels(self):
|
|
|
""" Called when the KernelManager channels have started listening or
|
|
|
when the frontend is assigned an already listening KernelManager.
|
|
|
"""
|
|
|
self.reset(clear=True)
|
|
|
|
|
|
#---------------------------------------------------------------------------
|
|
|
# 'FrontendWidget' public interface
|
|
|
#---------------------------------------------------------------------------
|
|
|
|
|
|
def copy_raw(self):
|
|
|
""" Copy the currently selected text to the clipboard without attempting
|
|
|
to remove prompts or otherwise alter the text.
|
|
|
"""
|
|
|
self._control.copy()
|
|
|
|
|
|
def execute_file(self, path, hidden=False):
|
|
|
""" Attempts to execute file with 'path'. If 'hidden', no output is
|
|
|
shown.
|
|
|
"""
|
|
|
self.execute('execfile(%r)' % path, hidden=hidden)
|
|
|
|
|
|
def interrupt_kernel(self):
|
|
|
""" Attempts to interrupt the running kernel.
|
|
|
|
|
|
Also unsets _reading flag, to avoid runtime errors
|
|
|
if raw_input is called again.
|
|
|
"""
|
|
|
if self.custom_interrupt:
|
|
|
self._reading = False
|
|
|
self.custom_interrupt_requested.emit()
|
|
|
elif self.kernel_manager:
|
|
|
self._reading = False
|
|
|
self.kernel_manager.interrupt_kernel()
|
|
|
else:
|
|
|
self._append_plain_text('Cannot interrupt a kernel I did not start.\n')
|
|
|
|
|
|
def reset(self, clear=False):
|
|
|
""" Resets the widget to its initial state if ``clear`` parameter
|
|
|
is True, otherwise
|
|
|
prints a visual indication of the fact that the kernel restarted, but
|
|
|
does not clear the traces from previous usage of the kernel before it
|
|
|
was restarted. With ``clear=True``, it is similar to ``%clear``, but
|
|
|
also re-writes the banner and aborts execution if necessary.
|
|
|
"""
|
|
|
if self._executing:
|
|
|
self._executing = False
|
|
|
self._request_info['execute'] = {}
|
|
|
self._reading = False
|
|
|
self._highlighter.highlighting_on = False
|
|
|
|
|
|
if clear:
|
|
|
self._control.clear()
|
|
|
if self._display_banner:
|
|
|
self._append_plain_text(self.banner)
|
|
|
if self.kernel_banner:
|
|
|
self._append_plain_text(self.kernel_banner)
|
|
|
|
|
|
# update output marker for stdout/stderr, so that startup
|
|
|
# messages appear after banner:
|
|
|
self._append_before_prompt_pos = self._get_cursor().position()
|
|
|
self._show_interpreter_prompt()
|
|
|
|
|
|
def restart_kernel(self, message, now=False):
|
|
|
""" Attempts to restart the running kernel.
|
|
|
"""
|
|
|
# FIXME: now should be configurable via a checkbox in the dialog. Right
|
|
|
# now at least the heartbeat path sets it to True and the manual restart
|
|
|
# to False. But those should just be the pre-selected states of a
|
|
|
# checkbox that the user could override if so desired. But I don't know
|
|
|
# enough Qt to go implementing the checkbox now.
|
|
|
|
|
|
if self.custom_restart:
|
|
|
self.custom_restart_requested.emit()
|
|
|
return
|
|
|
|
|
|
if self.kernel_manager:
|
|
|
# Pause the heart beat channel to prevent further warnings.
|
|
|
self.kernel_client.hb_channel.pause()
|
|
|
|
|
|
# Prompt the user to restart the kernel. Un-pause the heartbeat if
|
|
|
# they decline. (If they accept, the heartbeat will be un-paused
|
|
|
# automatically when the kernel is restarted.)
|
|
|
if self.confirm_restart:
|
|
|
buttons = QtGui.QMessageBox.Yes | QtGui.QMessageBox.No
|
|
|
result = QtGui.QMessageBox.question(self, 'Restart kernel?',
|
|
|
message, buttons)
|
|
|
do_restart = result == QtGui.QMessageBox.Yes
|
|
|
else:
|
|
|
# confirm_restart is False, so we don't need to ask user
|
|
|
# anything, just do the restart
|
|
|
do_restart = True
|
|
|
if do_restart:
|
|
|
try:
|
|
|
self.kernel_manager.restart_kernel(now=now)
|
|
|
except RuntimeError as e:
|
|
|
self._append_plain_text(
|
|
|
'Error restarting kernel: %s\n' % e,
|
|
|
before_prompt=True
|
|
|
)
|
|
|
else:
|
|
|
self._append_html("<br>Restarting kernel...\n<hr><br>",
|
|
|
before_prompt=True,
|
|
|
)
|
|
|
else:
|
|
|
self.kernel_client.hb_channel.unpause()
|
|
|
|
|
|
else:
|
|
|
self._append_plain_text(
|
|
|
'Cannot restart a Kernel I did not start\n',
|
|
|
before_prompt=True
|
|
|
)
|
|
|
|
|
|
def append_stream(self, text):
|
|
|
"""Appends text to the output stream."""
|
|
|
# Most consoles treat tabs as being 8 space characters. Convert tabs
|
|
|
# to spaces so that output looks as expected regardless of this
|
|
|
# widget's tab width.
|
|
|
text = text.expandtabs(8)
|
|
|
self._append_plain_text(text, before_prompt=True)
|
|
|
self._control.moveCursor(QtGui.QTextCursor.End)
|
|
|
|
|
|
def flush_clearoutput(self):
|
|
|
"""If a clearoutput is pending, execute it."""
|
|
|
if self._pending_clearoutput:
|
|
|
self._pending_clearoutput = False
|
|
|
self.clear_output()
|
|
|
|
|
|
def clear_output(self):
|
|
|
"""Clears the current line of output."""
|
|
|
cursor = self._control.textCursor()
|
|
|
cursor.beginEditBlock()
|
|
|
cursor.movePosition(cursor.StartOfLine, cursor.KeepAnchor)
|
|
|
cursor.insertText('')
|
|
|
cursor.endEditBlock()
|
|
|
|
|
|
#---------------------------------------------------------------------------
|
|
|
# 'FrontendWidget' protected interface
|
|
|
#---------------------------------------------------------------------------
|
|
|
|
|
|
def _auto_call_tip(self):
|
|
|
"""Trigger call tip automatically on open parenthesis
|
|
|
|
|
|
Call tips can be requested explcitly with `_call_tip`.
|
|
|
"""
|
|
|
cursor = self._get_cursor()
|
|
|
cursor.movePosition(QtGui.QTextCursor.Left)
|
|
|
if cursor.document().characterAt(cursor.position()) == '(':
|
|
|
# trigger auto call tip on open paren
|
|
|
self._call_tip()
|
|
|
|
|
|
def _call_tip(self):
|
|
|
"""Shows a call tip, if appropriate, at the current cursor location."""
|
|
|
# Decide if it makes sense to show a call tip
|
|
|
if not self.enable_calltips or not self.kernel_client.shell_channel.is_alive():
|
|
|
return False
|
|
|
cursor_pos = self._get_input_buffer_cursor_pos()
|
|
|
code = self.input_buffer
|
|
|
# Send the metadata request to the kernel
|
|
|
msg_id = self.kernel_client.inspect(code, cursor_pos)
|
|
|
pos = self._get_cursor().position()
|
|
|
self._request_info['call_tip'] = self._CallTipRequest(msg_id, pos)
|
|
|
return True
|
|
|
|
|
|
def _complete(self):
|
|
|
""" Performs completion at the current cursor location.
|
|
|
"""
|
|
|
# Send the completion request to the kernel
|
|
|
msg_id = self.kernel_client.complete(
|
|
|
code=self.input_buffer,
|
|
|
cursor_pos=self._get_input_buffer_cursor_pos(),
|
|
|
)
|
|
|
pos = self._get_cursor().position()
|
|
|
info = self._CompletionRequest(msg_id, pos)
|
|
|
self._request_info['complete'] = info
|
|
|
|
|
|
def _process_execute_abort(self, msg):
|
|
|
""" Process a reply for an aborted execution request.
|
|
|
"""
|
|
|
self._append_plain_text("ERROR: execution aborted\n")
|
|
|
|
|
|
def _process_execute_error(self, msg):
|
|
|
""" Process a reply for an execution request that resulted in an error.
|
|
|
"""
|
|
|
content = msg['content']
|
|
|
# If a SystemExit is passed along, this means exit() was called - also
|
|
|
# all the ipython %exit magic syntax of '-k' to be used to keep
|
|
|
# the kernel running
|
|
|
if content['ename']=='SystemExit':
|
|
|
keepkernel = content['evalue']=='-k' or content['evalue']=='True'
|
|
|
self._keep_kernel_on_exit = keepkernel
|
|
|
self.exit_requested.emit(self)
|
|
|
else:
|
|
|
traceback = ''.join(content['traceback'])
|
|
|
self._append_plain_text(traceback)
|
|
|
|
|
|
def _process_execute_ok(self, msg):
|
|
|
""" Process a reply for a successful execution request.
|
|
|
"""
|
|
|
payload = msg['content']['payload']
|
|
|
for item in payload:
|
|
|
if not self._process_execute_payload(item):
|
|
|
warning = 'Warning: received unknown payload of type %s'
|
|
|
print(warning % repr(item['source']))
|
|
|
|
|
|
def _process_execute_payload(self, item):
|
|
|
""" Process a single payload item from the list of payload items in an
|
|
|
execution reply. Returns whether the payload was handled.
|
|
|
"""
|
|
|
# The basic FrontendWidget doesn't handle payloads, as they are a
|
|
|
# mechanism for going beyond the standard Python interpreter model.
|
|
|
return False
|
|
|
|
|
|
def _show_interpreter_prompt(self):
|
|
|
""" Shows a prompt for the interpreter.
|
|
|
"""
|
|
|
self._show_prompt('>>> ')
|
|
|
|
|
|
def _show_interpreter_prompt_for_reply(self, msg):
|
|
|
""" Shows a prompt for the interpreter given an 'execute_reply' message.
|
|
|
"""
|
|
|
self._show_interpreter_prompt()
|
|
|
|
|
|
#------ Signal handlers ----------------------------------------------------
|
|
|
|
|
|
def _document_contents_change(self, position, removed, added):
|
|
|
""" Called whenever the document's content changes. Display a call tip
|
|
|
if appropriate.
|
|
|
"""
|
|
|
# Calculate where the cursor should be *after* the change:
|
|
|
position += added
|
|
|
|
|
|
document = self._control.document()
|
|
|
if position == self._get_cursor().position():
|
|
|
self._auto_call_tip()
|
|
|
|
|
|
#------ Trait default initializers -----------------------------------------
|
|
|
|
|
|
def _banner_default(self):
|
|
|
""" Returns the standard Python banner.
|
|
|
"""
|
|
|
banner = 'Python %s on %s\nType "help", "copyright", "credits" or ' \
|
|
|
'"license" for more information.'
|
|
|
return banner % (sys.version, sys.platform)
|
|
|
|
