frontend_widget.py
491 lines
| 20.0 KiB
| text/x-python
|
PythonLexer
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r2687 | # Standard library imports | ||
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r2934 | from collections import namedtuple | ||
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r2687 | import signal | ||
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r2714 | import sys | ||
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r2687 | |||
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r2602 | # System library imports | ||
from pygments.lexers import PythonLexer | ||||
from PyQt4 import QtCore, QtGui | ||||
# Local imports | ||||
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r2971 | from IPython.core.inputsplitter import InputSplitter, transform_classic_prompt | ||
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r2770 | from IPython.frontend.qt.base_frontend_mixin import BaseFrontendMixin | ||
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r2969 | from IPython.utils.io import raw_print | ||
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r2894 | from IPython.utils.traitlets import Bool | ||
from bracket_matcher import BracketMatcher | ||||
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r2602 | from call_tip_widget import CallTipWidget | ||
from completion_lexer import CompletionLexer | ||||
from console_widget import HistoryConsoleWidget | ||||
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r2603 | from pygments_highlighter import PygmentsHighlighter | ||
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r2602 | |||
class FrontendHighlighter(PygmentsHighlighter): | ||||
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r2715 | """ A PygmentsHighlighter that can be turned on and off and that ignores | ||
prompts. | ||||
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r2602 | """ | ||
def __init__(self, frontend): | ||||
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r2736 | super(FrontendHighlighter, self).__init__(frontend._control.document()) | ||
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r2602 | self._current_offset = 0 | ||
self._frontend = frontend | ||||
self.highlighting_on = False | ||||
def highlightBlock(self, qstring): | ||||
""" Highlight a block of text. Reimplemented to highlight selectively. | ||||
""" | ||||
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r2715 | if not self.highlighting_on: | ||
return | ||||
# The input to this function is unicode string that may contain | ||||
# paragraph break characters, non-breaking spaces, etc. Here we acquire | ||||
# the string as plain text so we can compare it. | ||||
current_block = self.currentBlock() | ||||
string = self._frontend._get_block_plain_text(current_block) | ||||
# Decide whether to check for the regular or continuation prompt. | ||||
if current_block.contains(self._frontend._prompt_pos): | ||||
prompt = self._frontend._prompt | ||||
else: | ||||
prompt = self._frontend._continuation_prompt | ||||
# Don't highlight the part of the string that contains the prompt. | ||||
if string.startswith(prompt): | ||||
self._current_offset = len(prompt) | ||||
qstring.remove(0, len(prompt)) | ||||
else: | ||||
self._current_offset = 0 | ||||
PygmentsHighlighter.highlightBlock(self, qstring) | ||||
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r2602 | |||
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r2825 | def rehighlightBlock(self, block): | ||
""" Reimplemented to temporarily enable highlighting if disabled. | ||||
""" | ||||
old = self.highlighting_on | ||||
self.highlighting_on = True | ||||
super(FrontendHighlighter, self).rehighlightBlock(block) | ||||
self.highlighting_on = old | ||||
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r2602 | def setFormat(self, start, count, format): | ||
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r2715 | """ Reimplemented to highlight selectively. | ||
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r2602 | """ | ||
start += self._current_offset | ||||
PygmentsHighlighter.setFormat(self, start, count, format) | ||||
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r2770 | class FrontendWidget(HistoryConsoleWidget, BaseFrontendMixin): | ||
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r2627 | """ A Qt frontend for a generic Python kernel. | ||
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r2602 | """ | ||
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r2851 | |||
# An option and corresponding signal for overriding the default kernel | ||||
# interrupt behavior. | ||||
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r2884 | custom_interrupt = Bool(False) | ||
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r2851 | custom_interrupt_requested = QtCore.pyqtSignal() | ||
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r2913 | # An option and corresponding signals for overriding the default kernel | ||
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r2851 | # restart behavior. | ||
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r2884 | custom_restart = Bool(False) | ||
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r2913 | custom_restart_kernel_died = QtCore.pyqtSignal(float) | ||
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r2851 | custom_restart_requested = QtCore.pyqtSignal() | ||
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r2723 | |||
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r2771 | # Emitted when an 'execute_reply' has been received from the kernel and | ||
# processed by the FrontendWidget. | ||||
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r2611 | executed = QtCore.pyqtSignal(object) | ||
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r2961 | |||
# Emitted when an exit request has been received from the kernel. | ||||
exit_requested = QtCore.pyqtSignal() | ||||
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r2851 | |||
# Protected class variables. | ||||
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r2934 | _CallTipRequest = namedtuple('_CallTipRequest', ['id', 'pos']) | ||
_CompletionRequest = namedtuple('_CompletionRequest', ['id', 'pos']) | ||||
_ExecutionRequest = namedtuple('_ExecutionRequest', ['id', 'kind']) | ||||
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r2894 | _input_splitter_class = InputSplitter | ||
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r2800 | |||
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r2602 | #--------------------------------------------------------------------------- | ||
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r2736 | # 'object' interface | ||
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r2602 | #--------------------------------------------------------------------------- | ||
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r2736 | def __init__(self, *args, **kw): | ||
super(FrontendWidget, self).__init__(*args, **kw) | ||||
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r2602 | |||
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r2643 | # FrontendWidget protected variables. | ||
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r2894 | self._bracket_matcher = BracketMatcher(self._control) | ||
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r2736 | self._call_tip_widget = CallTipWidget(self._control) | ||
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r2602 | self._completion_lexer = CompletionLexer(PythonLexer()) | ||
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r2824 | self._hidden = False | ||
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r2894 | self._highlighter = FrontendHighlighter(self) | ||
Fernando Perez
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r2862 | self._input_splitter = self._input_splitter_class(input_mode='block') | ||
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r2611 | self._kernel_manager = None | ||
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r2913 | self._possible_kernel_restart = False | ||
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r2934 | self._request_info = {} | ||
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r2602 | |||
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r2715 | # Configure the ConsoleWidget. | ||
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r2723 | self.tab_width = 4 | ||
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r2715 | self._set_continuation_prompt('... ') | ||
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r2736 | # Connect signal handlers. | ||
document = self._control.document() | ||||
document.contentsChange.connect(self._document_contents_change) | ||||
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r2612 | |||
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r2669 | #--------------------------------------------------------------------------- | ||
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r2971 | # 'ConsoleWidget' public interface | ||
#--------------------------------------------------------------------------- | ||||
def copy(self): | ||||
""" Copy the currently selected text to the clipboard, removing prompts. | ||||
""" | ||||
text = str(self._control.textCursor().selection().toPlainText()) | ||||
if text: | ||||
# Remove prompts. | ||||
lines = map(transform_classic_prompt, text.splitlines()) | ||||
text = '\n'.join(lines) | ||||
# Expand tabs so that we respect PEP-8. | ||||
QtGui.QApplication.clipboard().setText(text.expandtabs(4)) | ||||
#--------------------------------------------------------------------------- | ||||
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r2602 | # 'ConsoleWidget' abstract interface | ||
#--------------------------------------------------------------------------- | ||||
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r2688 | def _is_complete(self, source, interactive): | ||
""" Returns whether 'source' can be completely processed and a new | ||||
prompt created. When triggered by an Enter/Return key press, | ||||
'interactive' is True; otherwise, it is False. | ||||
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r2602 | """ | ||
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r2723 | complete = self._input_splitter.push(source.expandtabs(4)) | ||
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r2688 | if interactive: | ||
complete = not self._input_splitter.push_accepts_more() | ||||
return complete | ||||
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r2961 | def _execute(self, source, hidden): | ||
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r2688 | """ Execute 'source'. If 'hidden', do not show any output. | ||
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r2926 | |||
See parent class :meth:`execute` docstring for full details. | ||||
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r2688 | """ | ||
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r2961 | msg_id = self.kernel_manager.xreq_channel.execute(source, hidden) | ||
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r2934 | self._request_info['execute'] = self._ExecutionRequest(msg_id, 'user') | ||
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r2688 | self._hidden = hidden | ||
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r2602 | |||
def _prompt_started_hook(self): | ||||
""" Called immediately after a new prompt is displayed. | ||||
""" | ||||
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r2709 | if not self._reading: | ||
self._highlighter.highlighting_on = True | ||||
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r2602 | |||
def _prompt_finished_hook(self): | ||||
""" Called immediately after a prompt is finished, i.e. when some input | ||||
will be processed and a new prompt displayed. | ||||
""" | ||||
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r2709 | if not self._reading: | ||
self._highlighter.highlighting_on = False | ||||
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r2602 | |||
def _tab_pressed(self): | ||||
""" Called when the tab key is pressed. Returns whether to continue | ||||
processing the event. | ||||
""" | ||||
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r2847 | # Perform tab completion if: | ||
# 1) The cursor is in the input buffer. | ||||
# 2) There is a non-whitespace character before the cursor. | ||||
text = self._get_input_buffer_cursor_line() | ||||
if text is None: | ||||
return False | ||||
complete = bool(text[:self._get_input_buffer_cursor_column()].strip()) | ||||
if complete: | ||||
self._complete() | ||||
return not complete | ||||
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r2602 | |||
#--------------------------------------------------------------------------- | ||||
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r2787 | # 'ConsoleWidget' protected interface | ||
#--------------------------------------------------------------------------- | ||||
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r2851 | def _event_filter_console_keypress(self, event): | ||
""" Reimplemented to allow execution interruption. | ||||
""" | ||||
key = event.key() | ||||
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r2941 | if self._control_key_down(event.modifiers(), include_command=False): | ||
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r2897 | if key == QtCore.Qt.Key_C and self._executing: | ||
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r2913 | self.interrupt_kernel() | ||
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r2914 | return True | ||
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r2851 | elif key == QtCore.Qt.Key_Period: | ||
Brian Granger
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r2910 | message = 'Are you sure you want to restart the kernel?' | ||
Fernando Perez
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r2972 | self.restart_kernel(message, instant_death=False) | ||
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r2851 | return True | ||
return super(FrontendWidget, self)._event_filter_console_keypress(event) | ||||
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r2896 | def _insert_continuation_prompt(self, cursor): | ||
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r2787 | """ Reimplemented for auto-indentation. | ||
""" | ||||
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r2896 | super(FrontendWidget, self)._insert_continuation_prompt(cursor) | ||
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r2787 | spaces = self._input_splitter.indent_spaces | ||
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r2896 | cursor.insertText('\t' * (spaces / self.tab_width)) | ||
cursor.insertText(' ' * (spaces % self.tab_width)) | ||||
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r2787 | |||
#--------------------------------------------------------------------------- | ||||
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r2770 | # 'BaseFrontendMixin' abstract interface | ||
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r2602 | #--------------------------------------------------------------------------- | ||
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r2770 | def _handle_complete_reply(self, rep): | ||
""" Handle replies for tab completion. | ||||
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r2602 | """ | ||
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r2770 | cursor = self._get_cursor() | ||
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r2934 | info = self._request_info.get('complete') | ||
if info and info.id == rep['parent_header']['msg_id'] and \ | ||||
info.pos == cursor.position(): | ||||
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r2867 | text = '.'.join(self._get_context()) | ||
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r2770 | cursor.movePosition(QtGui.QTextCursor.Left, n=len(text)) | ||
self._complete_with_items(cursor, rep['content']['matches']) | ||||
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r2602 | |||
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r2770 | def _handle_execute_reply(self, msg): | ||
""" Handles replies for code execution. | ||||
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r2609 | """ | ||
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r2934 | info = self._request_info.get('execute') | ||
if info and info.id == msg['parent_header']['msg_id'] and \ | ||||
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r2961 | info.kind == 'user' and not self._hidden: | ||
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r2770 | # Make sure that all output from the SUB channel has been processed | ||
# before writing a new prompt. | ||||
self.kernel_manager.sub_channel.flush() | ||||
content = msg['content'] | ||||
status = content['status'] | ||||
if status == 'ok': | ||||
self._process_execute_ok(msg) | ||||
elif status == 'error': | ||||
self._process_execute_error(msg) | ||||
elif status == 'abort': | ||||
self._process_execute_abort(msg) | ||||
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r2797 | self._show_interpreter_prompt_for_reply(msg) | ||
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r2770 | self.executed.emit(msg) | ||
def _handle_input_request(self, msg): | ||||
""" Handle requests for raw_input. | ||||
""" | ||||
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r2771 | if self._hidden: | ||
raise RuntimeError('Request for raw input during hidden execution.') | ||||
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r2770 | # Make sure that all output from the SUB channel has been processed | ||
# before entering readline mode. | ||||
self.kernel_manager.sub_channel.flush() | ||||
def callback(line): | ||||
self.kernel_manager.rep_channel.input(line) | ||||
self._readline(msg['content']['prompt'], callback=callback) | ||||
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r2609 | |||
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r2913 | def _handle_kernel_died(self, since_last_heartbeat): | ||
""" Handle the kernel's death by asking if the user wants to restart. | ||||
""" | ||||
message = 'The kernel heartbeat has been inactive for %.2f ' \ | ||||
'seconds. Do you want to restart the kernel? You may ' \ | ||||
'first want to check the network connection.' % \ | ||||
since_last_heartbeat | ||||
if self.custom_restart: | ||||
self.custom_restart_kernel_died.emit(since_last_heartbeat) | ||||
else: | ||||
Fernando Perez
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r2972 | self.restart_kernel(message, instant_death=True) | ||
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r2913 | |||
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r2770 | def _handle_object_info_reply(self, rep): | ||
""" Handle replies for call tips. | ||||
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r2609 | """ | ||
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r2770 | cursor = self._get_cursor() | ||
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r2934 | info = self._request_info.get('call_tip') | ||
if info and info.id == rep['parent_header']['msg_id'] and \ | ||||
info.pos == cursor.position(): | ||||
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r2770 | doc = rep['content']['docstring'] | ||
if doc: | ||||
self._call_tip_widget.show_docstring(doc) | ||||
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r2643 | |||
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r2770 | def _handle_pyout(self, msg): | ||
""" Handle display hook output. | ||||
""" | ||||
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r2824 | if not self._hidden and self._is_from_this_session(msg): | ||
self._append_plain_text(msg['content']['data'] + '\n') | ||||
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r2609 | |||
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r2770 | def _handle_stream(self, msg): | ||
""" Handle stdout, stderr, and stdin. | ||||
""" | ||||
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r2824 | if not self._hidden and self._is_from_this_session(msg): | ||
self._append_plain_text(msg['content']['data']) | ||||
self._control.moveCursor(QtGui.QTextCursor.End) | ||||
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r2770 | |||
def _started_channels(self): | ||||
""" Called when the KernelManager channels have started listening or | ||||
when the frontend is assigned an already listening KernelManager. | ||||
""" | ||||
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r2842 | self._control.clear() | ||
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r2770 | self._append_plain_text(self._get_banner()) | ||
self._show_interpreter_prompt() | ||||
def _stopped_channels(self): | ||||
""" Called when the KernelManager channels have stopped listening or | ||||
when a listening KernelManager is removed from the frontend. | ||||
""" | ||||
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r2842 | self._executing = self._reading = False | ||
self._highlighter.highlighting_on = False | ||||
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r2770 | |||
#--------------------------------------------------------------------------- | ||||
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r2971 | # 'FrontendWidget' public interface | ||
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r2770 | #--------------------------------------------------------------------------- | ||
def execute_file(self, path, hidden=False): | ||||
""" Attempts to execute file with 'path'. If 'hidden', no output is | ||||
shown. | ||||
""" | ||||
self.execute('execfile("%s")' % path, hidden=hidden) | ||||
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r2609 | |||
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r2913 | def interrupt_kernel(self): | ||
""" Attempts to interrupt the running kernel. | ||||
""" | ||||
if self.custom_interrupt: | ||||
self.custom_interrupt_requested.emit() | ||||
elif self.kernel_manager.has_kernel: | ||||
self.kernel_manager.signal_kernel(signal.SIGINT) | ||||
else: | ||||
self._append_plain_text('Kernel process is either remote or ' | ||||
'unspecified. Cannot interrupt.\n') | ||||
Fernando Perez
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r2972 | def restart_kernel(self, message, instant_death=False): | ||
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r2913 | """ Attempts to restart the running kernel. | ||
""" | ||||
Fernando Perez
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r2972 | # FIXME: instant_death 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. | ||||
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r2913 | # We want to make sure that if this dialog is already happening, that | ||
# other signals don't trigger it again. This can happen when the | ||||
# kernel_died heartbeat signal is emitted and the user is slow to | ||||
# respond to the dialog. | ||||
if not self._possible_kernel_restart: | ||||
if self.custom_restart: | ||||
self.custom_restart_requested.emit() | ||||
elif self.kernel_manager.has_kernel: | ||||
# Setting this to True will prevent this logic from happening | ||||
# again until the current pass is completed. | ||||
self._possible_kernel_restart = True | ||||
buttons = QtGui.QMessageBox.Yes | QtGui.QMessageBox.No | ||||
result = QtGui.QMessageBox.question(self, 'Restart kernel?', | ||||
message, buttons) | ||||
if result == QtGui.QMessageBox.Yes: | ||||
try: | ||||
Fernando Perez
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r2972 | self.kernel_manager.restart_kernel( | ||
instant_death=instant_death) | ||||
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r2913 | except RuntimeError: | ||
message = 'Kernel started externally. Cannot restart.\n' | ||||
self._append_plain_text(message) | ||||
else: | ||||
self._stopped_channels() | ||||
self._append_plain_text('Kernel restarting...\n') | ||||
self._show_interpreter_prompt() | ||||
# This might need to be moved to another location? | ||||
self._possible_kernel_restart = False | ||||
else: | ||||
self._append_plain_text('Kernel process is either remote or ' | ||||
'unspecified. Cannot restart.\n') | ||||
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r2602 | #--------------------------------------------------------------------------- | ||
# 'FrontendWidget' protected interface | ||||
#--------------------------------------------------------------------------- | ||||
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 | ||||
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r2736 | cursor = self._get_cursor() | ||
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r2602 | cursor.movePosition(QtGui.QTextCursor.Left) | ||
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r2864 | if cursor.document().characterAt(cursor.position()).toAscii() != '(': | ||
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r2602 | return False | ||
context = self._get_context(cursor) | ||||
if not context: | ||||
return False | ||||
# Send the metadata request to the kernel | ||||
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r2612 | name = '.'.join(context) | ||
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r2934 | msg_id = self.kernel_manager.xreq_channel.object_info(name) | ||
pos = self._get_cursor().position() | ||||
self._request_info['call_tip'] = self._CallTipRequest(msg_id, pos) | ||||
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r2602 | return True | ||
def _complete(self): | ||||
""" Performs completion at the current cursor location. | ||||
""" | ||||
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r2867 | context = self._get_context() | ||
if context: | ||||
# Send the completion request to the kernel | ||||
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r2934 | msg_id = self.kernel_manager.xreq_channel.complete( | ||
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r2867 | '.'.join(context), # text | ||
self._get_input_buffer_cursor_line(), # line | ||||
self._get_input_buffer_cursor_column(), # cursor_pos | ||||
self.input_buffer) # block | ||||
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r2934 | pos = self._get_cursor().position() | ||
info = self._CompletionRequest(msg_id, pos) | ||||
self._request_info['complete'] = info | ||||
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r2602 | |||
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r2714 | def _get_banner(self): | ||
""" Gets a banner to display at the beginning of a session. | ||||
""" | ||||
banner = 'Python %s on %s\nType "help", "copyright", "credits" or ' \ | ||||
'"license" for more information.' | ||||
return banner % (sys.version, sys.platform) | ||||
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r2602 | def _get_context(self, cursor=None): | ||
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r2864 | """ Gets the context for the specified cursor (or the current cursor | ||
if none is specified). | ||||
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r2602 | """ | ||
if cursor is None: | ||||
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r2736 | cursor = self._get_cursor() | ||
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r2764 | cursor.movePosition(QtGui.QTextCursor.StartOfBlock, | ||
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r2602 | QtGui.QTextCursor.KeepAnchor) | ||
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r2720 | text = str(cursor.selection().toPlainText()) | ||
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r2602 | return self._completion_lexer.get_context(text) | ||
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r2770 | def _process_execute_abort(self, msg): | ||
""" Process a reply for an aborted execution request. | ||||
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r2715 | """ | ||
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r2770 | self._append_plain_text("ERROR: execution aborted\n") | ||
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r2602 | |||
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r2770 | def _process_execute_error(self, msg): | ||
""" Process a reply for an execution request that resulted in an error. | ||||
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r2705 | """ | ||
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r2770 | content = msg['content'] | ||
traceback = ''.join(content['traceback']) | ||||
self._append_plain_text(traceback) | ||||
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r2705 | |||
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r2770 | def _process_execute_ok(self, msg): | ||
""" Process a reply for a successful execution equest. | ||||
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r2705 | """ | ||
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r2835 | payload = msg['content']['payload'] | ||
for item in payload: | ||||
if not self._process_execute_payload(item): | ||||
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r2969 | warning = 'Warning: received unknown payload of type %s' | ||
raw_print(warning % repr(item['source'])) | ||||
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r2835 | |||
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. | ||||
""" | ||||
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r2770 | # The basic FrontendWidget doesn't handle payloads, as they are a | ||
# mechanism for going beyond the standard Python interpreter model. | ||||
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r2835 | return False | ||
epatters
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r2705 | |||
epatters
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r2770 | def _show_interpreter_prompt(self): | ||
""" Shows a prompt for the interpreter. | ||||
""" | ||||
self._show_prompt('>>> ') | ||||
epatters
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r2797 | def _show_interpreter_prompt_for_reply(self, msg): | ||
""" Shows a prompt for the interpreter given an 'execute_reply' message. | ||||
""" | ||||
self._show_interpreter_prompt() | ||||
epatters
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r2770 | #------ Signal handlers ---------------------------------------------------- | ||
epatters
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r2602 | def _document_contents_change(self, position, removed, added): | ||
epatters
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r2744 | """ Called whenever the document's content changes. Display a call tip | ||
epatters
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r2602 | if appropriate. | ||
""" | ||||
# Calculate where the cursor should be *after* the change: | ||||
position += added | ||||
epatters
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r2736 | document = self._control.document() | ||
if position == self._get_cursor().position(): | ||||
epatters
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r2602 | self._call_tip() | ||