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# System library imports
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from pygments.lexers import PythonLexer
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from PyQt4 import QtCore, QtGui
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import zmq
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# Local imports
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from IPython.core.inputsplitter import InputSplitter
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from call_tip_widget import CallTipWidget
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from completion_lexer import CompletionLexer
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from 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 Python PygmentsHighlighter that can be turned on and off and which
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knows about continuation prompts.
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"""
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def __init__(self, frontend):
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PygmentsHighlighter.__init__(self, frontend.document(), PythonLexer())
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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, qstring):
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""" Highlight a block of text. Reimplemented to highlight selectively.
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"""
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if self.highlighting_on:
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for prompt in (self._frontend._continuation_prompt,
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self._frontend._prompt):
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if qstring.startsWith(prompt):
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qstring.remove(0, len(prompt))
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self._current_offset = len(prompt)
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break
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PygmentsHighlighter.highlightBlock(self, qstring)
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def setFormat(self, start, count, format):
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""" Reimplemented to avoid highlighting continuation prompts.
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"""
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start += self._current_offset
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PygmentsHighlighter.setFormat(self, start, count, format)
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class FrontendWidget(HistoryConsoleWidget):
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""" A Qt frontend for a generic Python kernel.
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"""
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# Emitted when an 'execute_reply' is received from the kernel.
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executed = QtCore.pyqtSignal(object)
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#---------------------------------------------------------------------------
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# 'QObject' interface
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#---------------------------------------------------------------------------
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def __init__(self, parent=None):
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super(FrontendWidget, self).__init__(parent)
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# ConsoleWidget protected variables.
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self._continuation_prompt = '... '
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self._prompt = '>>> '
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# FrontendWidget protected variables.
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self._call_tip_widget = CallTipWidget(self)
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self._completion_lexer = CompletionLexer(PythonLexer())
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self._hidden = True
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self._highlighter = FrontendHighlighter(self)
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self._input_splitter = InputSplitter(input_mode='replace')
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self._kernel_manager = None
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self.document().contentsChange.connect(self._document_contents_change)
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#---------------------------------------------------------------------------
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# 'QWidget' interface
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#---------------------------------------------------------------------------
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def focusOutEvent(self, event):
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""" Reimplemented to hide calltips.
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"""
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self._call_tip_widget.hide()
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return super(FrontendWidget, self).focusOutEvent(event)
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def keyPressEvent(self, event):
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""" Reimplemented to hide calltips.
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"""
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if event.key() == QtCore.Qt.Key_Escape:
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self._call_tip_widget.hide()
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return super(FrontendWidget, self).keyPressEvent(event)
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#---------------------------------------------------------------------------
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# 'ConsoleWidget' abstract interface
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#---------------------------------------------------------------------------
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def _execute(self, interactive):
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""" Called to execute the input buffer. When triggered by an the enter
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key press, 'interactive' is True; otherwise, it is False. Returns
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whether the input buffer was completely processed and a new prompt
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created.
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"""
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return self.execute_source(self.input_buffer, interactive=interactive)
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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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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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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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self._keep_cursor_in_buffer()
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cursor = self.textCursor()
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if not self._complete():
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cursor.insertText(' ')
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return False
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#---------------------------------------------------------------------------
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# 'FrontendWidget' interface
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#---------------------------------------------------------------------------
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def execute_source(self, source, hidden=False, interactive=False):
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""" Execute a string containing Python code. If 'hidden', no output is
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shown. Returns whether the source executed (i.e., returns True only
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if no more input is necessary).
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"""
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self._input_splitter.push(source)
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executed = not self._input_splitter.push_accepts_more()
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if executed:
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self.kernel_manager.xreq_channel.execute(source)
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self._hidden = hidden
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else:
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self._show_continuation_prompt()
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self.appendPlainText(' ' * self._input_splitter.indent_spaces)
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return executed
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def execute_file(self, path, hidden=False):
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""" Attempts to execute file with 'path'. If 'hidden', no output is
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shown.
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"""
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self.execute_source('run %s' % path, hidden=hidden)
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def _get_kernel_manager(self):
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""" Returns the current kernel manager.
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"""
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return self._kernel_manager
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def _set_kernel_manager(self, kernel_manager):
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""" Disconnect from the current kernel manager (if any) and set a new
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kernel manager.
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"""
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# Disconnect the old kernel manager, if necessary.
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if self._kernel_manager is not None:
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self._kernel_manager.started_listening.disconnect(
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self._started_listening)
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self._kernel_manager.stopped_listening.disconnect(
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self._stopped_listening)
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# Disconnect the old kernel manager's channels.
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sub = self._kernel_manager.sub_channel
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xreq = self._kernel_manager.xreq_channel
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sub.message_received.disconnect(self._handle_sub)
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xreq.execute_reply.disconnect(self._handle_execute_reply)
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xreq.complete_reply.disconnect(self._handle_complete_reply)
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xreq.object_info_reply.disconnect(self._handle_object_info_reply)
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# Set the new kernel manager.
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self._kernel_manager = kernel_manager
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if kernel_manager is None:
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return
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# Connect the new kernel manager.
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kernel_manager.started_listening.connect(self._started_listening)
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kernel_manager.stopped_listening.connect(self._stopped_listening)
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# Connect the new kernel manager's channels.
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sub = kernel_manager.sub_channel
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xreq = kernel_manager.xreq_channel
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sub.message_received.connect(self._handle_sub)
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xreq.execute_reply.connect(self._handle_execute_reply)
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xreq.complete_reply.connect(self._handle_complete_reply)
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xreq.object_info_reply.connect(self._handle_object_info_reply)
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# Handle the case where the kernel manager started listening before
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# we connected.
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if kernel_manager.is_listening:
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self._started_listening()
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kernel_manager = property(_get_kernel_manager, _set_kernel_manager)
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#---------------------------------------------------------------------------
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# 'FrontendWidget' protected interface
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#---------------------------------------------------------------------------
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def _call_tip(self):
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""" Shows a call tip, if appropriate, at the current cursor location.
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"""
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# Decide if it makes sense to show a call tip
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cursor = self.textCursor()
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cursor.movePosition(QtGui.QTextCursor.Left)
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document = self.document()
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if document.characterAt(cursor.position()).toAscii() != '(':
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return False
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context = self._get_context(cursor)
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if not context:
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return False
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# Send the metadata request to the kernel
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name = '.'.join(context)
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self._calltip_id = self.kernel_manager.xreq_channel.object_info(name)
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self._calltip_pos = self.textCursor().position()
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return True
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def _complete(self):
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""" Performs completion at the current cursor location.
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"""
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# Decide if it makes sense to do completion
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context = self._get_context()
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if not context:
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return False
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# Send the completion request to the kernel
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text = '.'.join(context)
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self._complete_id = self.kernel_manager.xreq_channel.complete(
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text, self.input_buffer_cursor_line, self.input_buffer)
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self._complete_pos = self.textCursor().position()
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return True
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def _get_context(self, cursor=None):
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""" Gets the context at the current cursor location.
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"""
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if cursor is None:
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cursor = self.textCursor()
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cursor.movePosition(QtGui.QTextCursor.StartOfLine,
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QtGui.QTextCursor.KeepAnchor)
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text = unicode(cursor.selectedText())
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return self._completion_lexer.get_context(text)
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#------ Signal handlers ----------------------------------------------------
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def _document_contents_change(self, position, removed, added):
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""" Called whenever the document's content changes. Display a calltip
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if appropriate.
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"""
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# Calculate where the cursor should be *after* the change:
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position += added
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document = self.document()
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if position == self.textCursor().position():
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self._call_tip()
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def _handle_sub(self, omsg):
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if not self._hidden:
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handler = getattr(self, '_handle_%s' % omsg['msg_type'], None)
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if handler is not None:
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handler(omsg)
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def _handle_pyout(self, omsg):
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session = omsg['parent_header']['session']
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if session == self.kernel_manager.session.session:
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self.appendPlainText(omsg['content']['data'] + '\n')
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def _handle_stream(self, omsg):
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self.appendPlainText(omsg['content']['data'])
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def _handle_execute_reply(self, rep):
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# Make sure that all output from the SUB channel has been processed
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# before writing a new prompt.
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self.kernel_manager.sub_channel.flush()
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content = rep['content']
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status = content['status']
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if status == 'error':
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self.appendPlainText(content['traceback'][-1])
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elif status == 'aborted':
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text = "ERROR: ABORTED\n"
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self.appendPlainText(text)
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self._hidden = True
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self._show_prompt()
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self.executed.emit(rep)
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def _handle_complete_reply(self, rep):
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cursor = self.textCursor()
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if rep['parent_header']['msg_id'] == self._complete_id and \
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cursor.position() == self._complete_pos:
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text = '.'.join(self._get_context())
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cursor.movePosition(QtGui.QTextCursor.Left, n=len(text))
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self._complete_with_items(cursor, rep['content']['matches'])
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def _handle_object_info_reply(self, rep):
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cursor = self.textCursor()
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if rep['parent_header']['msg_id'] == self._calltip_id and \
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cursor.position() == self._calltip_pos:
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doc = rep['content']['docstring']
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if doc:
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self._call_tip_widget.show_docstring(doc)
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def _started_listening(self):
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self.clear()
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def _stopped_listening(self):
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pass
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