615 lines
24 KiB
Python
615 lines
24 KiB
Python
"""A FrontendWidget that emulates a repl for a Jupyter kernel.
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This supports the additional functionality provided by Jupyter kernel.
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"""
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# Copyright (c) Jupyter Development Team.
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# Distributed under the terms of the Modified BSD License.
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from collections import namedtuple
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import os.path
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import re
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from subprocess import Popen
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import sys
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import time
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from textwrap import dedent
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from warnings import warn
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from qtpy import QtCore, QtGui
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from IPython.lib.lexers import IPythonLexer, IPython3Lexer
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from pygments.lexers import get_lexer_by_name
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from pygments.util import ClassNotFound
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from qtconsole import __version__
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from traitlets import Bool, Unicode, observe, default
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from .frontend_widget import FrontendWidget
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from . import styles
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#-----------------------------------------------------------------------------
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# Constants
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#-----------------------------------------------------------------------------
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# Default strings to build and display input and output prompts (and separators
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# in between)
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default_in_prompt = 'In [<span class="in-prompt-number">%i</span>]: '
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default_out_prompt = 'Out[<span class="out-prompt-number">%i</span>]: '
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default_input_sep = '\n'
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default_output_sep = ''
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default_output_sep2 = ''
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# Base path for most payload sources.
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zmq_shell_source = 'ipykernel.zmqshell.ZMQInteractiveShell'
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if sys.platform.startswith('win'):
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default_editor = 'notepad'
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else:
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default_editor = ''
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#-----------------------------------------------------------------------------
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# JupyterWidget class
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#-----------------------------------------------------------------------------
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class IPythonWidget(FrontendWidget):
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"""Dummy class for config inheritance. Destroyed below."""
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class JupyterWidget(IPythonWidget):
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"""A FrontendWidget for a Jupyter kernel."""
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# If set, the 'custom_edit_requested(str, int)' signal will be emitted when
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# an editor is needed for a file. This overrides 'editor' and 'editor_line'
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# settings.
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custom_edit = Bool(False)
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custom_edit_requested = QtCore.Signal(object, object)
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editor = Unicode(default_editor, config=True,
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help="""
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A command for invoking a GUI text editor. If the string contains a
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{filename} format specifier, it will be used. Otherwise, the filename
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will be appended to the end the command. To use a terminal text editor,
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the command should launch a new terminal, e.g.
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``"gnome-terminal -- vim"``.
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""")
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editor_line = Unicode(config=True,
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help="""
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The editor command to use when a specific line number is requested. The
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string should contain two format specifiers: {line} and {filename}. If
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this parameter is not specified, the line number option to the %edit
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magic will be ignored.
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""")
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style_sheet = Unicode(config=True,
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help="""
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A CSS stylesheet. The stylesheet can contain classes for:
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1. Qt: QPlainTextEdit, QFrame, QWidget, etc
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2. Pygments: .c, .k, .o, etc. (see PygmentsHighlighter)
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3. QtConsole: .error, .in-prompt, .out-prompt, etc
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""")
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syntax_style = Unicode(config=True,
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help="""
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If not empty, use this Pygments style for syntax highlighting.
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Otherwise, the style sheet is queried for Pygments style
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information.
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""")
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# Prompts.
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in_prompt = Unicode(default_in_prompt, config=True)
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out_prompt = Unicode(default_out_prompt, config=True)
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input_sep = Unicode(default_input_sep, config=True)
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output_sep = Unicode(default_output_sep, config=True)
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output_sep2 = Unicode(default_output_sep2, config=True)
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# JupyterWidget protected class variables.
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_PromptBlock = namedtuple('_PromptBlock', ['block', 'length', 'number'])
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_payload_source_edit = 'edit_magic'
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_payload_source_exit = 'ask_exit'
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_payload_source_next_input = 'set_next_input'
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_payload_source_page = 'page'
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_retrying_history_request = False
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_starting = False
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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(JupyterWidget, self).__init__(*args, **kw)
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# JupyterWidget protected variables.
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self._payload_handlers = {
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self._payload_source_edit : self._handle_payload_edit,
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self._payload_source_exit : self._handle_payload_exit,
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self._payload_source_page : self._handle_payload_page,
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self._payload_source_next_input : self._handle_payload_next_input }
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self._previous_prompt_obj = None
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self._keep_kernel_on_exit = None
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# Initialize widget styling.
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if self.style_sheet:
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self._style_sheet_changed()
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self._syntax_style_changed()
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else:
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self.set_default_style()
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# Initialize language name.
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self.language_name = None
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#---------------------------------------------------------------------------
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# 'BaseFrontendMixin' abstract interface
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#
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# For JupyterWidget, override FrontendWidget methods which implement the
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# BaseFrontend Mixin abstract interface
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#---------------------------------------------------------------------------
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def _handle_complete_reply(self, rep):
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"""Support Jupyter's improved completion machinery.
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"""
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self.log.debug("complete: %s", rep.get('content', ''))
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cursor = self._get_cursor()
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info = self._request_info.get('complete')
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if (info and info.id == rep['parent_header']['msg_id']
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and info.pos == self._get_input_buffer_cursor_pos()
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and info.code == self.input_buffer):
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content = rep['content']
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matches = content['matches']
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start = content['cursor_start']
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end = content['cursor_end']
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start = max(start, 0)
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end = max(end, start)
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# Move the control's cursor to the desired end point
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cursor_pos = self._get_input_buffer_cursor_pos()
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if end < cursor_pos:
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cursor.movePosition(QtGui.QTextCursor.Left,
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n=(cursor_pos - end))
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elif end > cursor_pos:
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cursor.movePosition(QtGui.QTextCursor.Right,
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n=(end - cursor_pos))
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# This line actually applies the move to control's cursor
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self._control.setTextCursor(cursor)
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offset = end - start
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# Move the local cursor object to the start of the match and
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# complete.
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cursor.movePosition(QtGui.QTextCursor.Left, n=offset)
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self._complete_with_items(cursor, matches)
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def _handle_execute_reply(self, msg):
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"""Support prompt requests.
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"""
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msg_id = msg['parent_header'].get('msg_id')
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info = self._request_info['execute'].get(msg_id)
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if info and info.kind == 'prompt':
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content = msg['content']
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if content['status'] == 'aborted':
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self._show_interpreter_prompt()
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else:
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number = content['execution_count'] + 1
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self._show_interpreter_prompt(number)
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self._request_info['execute'].pop(msg_id)
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else:
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super(JupyterWidget, self)._handle_execute_reply(msg)
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def _handle_history_reply(self, msg):
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""" Handle history tail replies, which are only supported
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by Jupyter kernels.
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"""
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content = msg['content']
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if 'history' not in content:
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self.log.error("History request failed: %r"%content)
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if content.get('status', '') == 'aborted' and \
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not self._retrying_history_request:
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# a *different* action caused this request to be aborted, so
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# we should try again.
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self.log.error("Retrying aborted history request")
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# prevent multiple retries of aborted requests:
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self._retrying_history_request = True
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# wait out the kernel's queue flush, which is currently timed at 0.1s
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time.sleep(0.25)
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self.kernel_client.history(hist_access_type='tail',n=1000)
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else:
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self._retrying_history_request = False
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return
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# reset retry flag
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self._retrying_history_request = False
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history_items = content['history']
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self.log.debug("Received history reply with %i entries", len(history_items))
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items = []
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last_cell = u""
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for _, _, cell in history_items:
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cell = cell.rstrip()
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if cell != last_cell:
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items.append(cell)
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last_cell = cell
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self._set_history(items)
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def _insert_other_input(self, cursor, content, remote=True):
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"""Insert function for input from other frontends"""
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n = content.get('execution_count', 0)
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prompt = self._make_in_prompt(n, remote=remote)
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cont_prompt = self._make_continuation_prompt(self._prompt, remote=remote)
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cursor.insertText('\n')
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for i, line in enumerate(content['code'].strip().split('\n')):
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if i == 0:
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self._insert_html(cursor, prompt)
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else:
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self._insert_html(cursor, cont_prompt)
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self._insert_plain_text(cursor, line + '\n')
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# Update current prompt number
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self._update_prompt(n + 1)
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def _handle_execute_input(self, msg):
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"""Handle an execute_input message"""
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self.log.debug("execute_input: %s", msg.get('content', ''))
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if self.include_output(msg):
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self._append_custom(
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self._insert_other_input, msg['content'], before_prompt=True)
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elif not self._prompt:
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self._append_custom(
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self._insert_other_input, msg['content'],
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before_prompt=True, remote=False)
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def _handle_execute_result(self, msg):
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"""Handle an execute_result message"""
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self.log.debug("execute_result: %s", msg.get('content', ''))
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if self.include_output(msg):
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self.flush_clearoutput()
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content = msg['content']
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prompt_number = content.get('execution_count', 0)
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data = content['data']
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if 'text/plain' in data:
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self._append_plain_text(self.output_sep, before_prompt=True)
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self._append_html(
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self._make_out_prompt(prompt_number, remote=not self.from_here(msg)),
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before_prompt=True
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)
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text = data['text/plain']
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# If the repr is multiline, make sure we start on a new line,
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# so that its lines are aligned.
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if "\n" in text and not self.output_sep.endswith("\n"):
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self._append_plain_text('\n', before_prompt=True)
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self._append_plain_text(text + self.output_sep2, before_prompt=True)
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if not self.from_here(msg):
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self._append_plain_text('\n', before_prompt=True)
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def _handle_display_data(self, msg):
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"""The base handler for the ``display_data`` message."""
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# For now, we don't display data from other frontends, but we
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# eventually will as this allows all frontends to monitor the display
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# data. But we need to figure out how to handle this in the GUI.
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if self.include_output(msg):
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self.flush_clearoutput()
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data = msg['content']['data']
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metadata = msg['content']['metadata']
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# In the regular JupyterWidget, we simply print the plain text
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# representation.
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if 'text/plain' in data:
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text = data['text/plain']
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self._append_plain_text(text, True)
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# This newline seems to be needed for text and html output.
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self._append_plain_text(u'\n', True)
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def _handle_kernel_info_reply(self, rep):
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"""Handle kernel info replies."""
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content = rep['content']
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self.language_name = content['language_info']['name']
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pygments_lexer = content['language_info'].get('pygments_lexer', '')
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try:
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# Other kernels with pygments_lexer info will have to be
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# added here by hand.
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if pygments_lexer == 'ipython3':
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lexer = IPython3Lexer()
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elif pygments_lexer == 'ipython2':
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lexer = IPythonLexer()
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else:
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lexer = get_lexer_by_name(self.language_name)
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self._highlighter._lexer = lexer
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except ClassNotFound:
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pass
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self.kernel_banner = content.get('banner', '')
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if self._starting:
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# finish handling started channels
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self._starting = False
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super(JupyterWidget, self)._started_channels()
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def _started_channels(self):
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"""Make a history request"""
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self._starting = True
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self.kernel_client.kernel_info()
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self.kernel_client.history(hist_access_type='tail', n=1000)
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#---------------------------------------------------------------------------
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# 'FrontendWidget' protected interface
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#---------------------------------------------------------------------------
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def _process_execute_error(self, msg):
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"""Handle an execute_error message"""
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self.log.debug("execute_error: %s", msg.get('content', ''))
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content = msg['content']
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traceback = '\n'.join(content['traceback']) + '\n'
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if False:
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# FIXME: For now, tracebacks come as plain text, so we can't
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# use the html renderer yet. Once we refactor ultratb to
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# produce properly styled tracebacks, this branch should be the
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# default
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traceback = traceback.replace(' ', ' ')
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traceback = traceback.replace('\n', '<br/>')
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ename = content['ename']
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ename_styled = '<span class="error">%s</span>' % ename
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traceback = traceback.replace(ename, ename_styled)
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self._append_html(traceback)
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else:
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# This is the fallback for now, using plain text with ansi
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# escapes
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self._append_plain_text(traceback, before_prompt=not self.from_here(msg))
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def _process_execute_payload(self, item):
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""" Reimplemented to dispatch payloads to handler methods.
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"""
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handler = self._payload_handlers.get(item['source'])
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if handler is None:
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# We have no handler for this type of payload, simply ignore it
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return False
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else:
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handler(item)
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return True
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def _show_interpreter_prompt(self, number=None):
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""" Reimplemented for IPython-style prompts.
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"""
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# If a number was not specified, make a prompt number request.
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if number is None:
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msg_id = self.kernel_client.execute('', silent=True)
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info = self._ExecutionRequest(msg_id, 'prompt')
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self._request_info['execute'][msg_id] = info
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return
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# Show a new prompt and save information about it so that it can be
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# updated later if the prompt number turns out to be wrong.
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self._prompt_sep = self.input_sep
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self._show_prompt(self._make_in_prompt(number), html=True)
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block = self._control.document().lastBlock()
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length = len(self._prompt)
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self._previous_prompt_obj = self._PromptBlock(block, length, number)
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# Update continuation prompt to reflect (possibly) new prompt length.
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self._set_continuation_prompt(
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self._make_continuation_prompt(self._prompt), html=True)
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def _update_prompt(self, new_prompt_number):
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"""Replace the last displayed prompt with a new one."""
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if self._previous_prompt_obj is None:
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return
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block = self._previous_prompt_obj.block
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# Make sure the prompt block has not been erased.
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if block.isValid() and block.text():
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# Remove the old prompt and insert a new prompt.
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cursor = QtGui.QTextCursor(block)
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cursor.movePosition(QtGui.QTextCursor.Right,
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QtGui.QTextCursor.KeepAnchor,
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self._previous_prompt_obj.length)
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prompt = self._make_in_prompt(new_prompt_number)
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self._prompt = self._insert_html_fetching_plain_text(
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cursor, prompt)
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# When the HTML is inserted, Qt blows away the syntax
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# highlighting for the line, so we need to rehighlight it.
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self._highlighter.rehighlightBlock(cursor.block())
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# Update the prompt cursor
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self._prompt_cursor.setPosition(cursor.position() - 1)
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# Store the updated prompt.
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block = self._control.document().lastBlock()
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length = len(self._prompt)
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self._previous_prompt_obj = self._PromptBlock(block, length, new_prompt_number)
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def _show_interpreter_prompt_for_reply(self, msg):
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""" Reimplemented for IPython-style prompts.
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"""
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# Update the old prompt number if necessary.
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content = msg['content']
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# abort replies do not have any keys:
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if content['status'] == 'aborted':
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if self._previous_prompt_obj:
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previous_prompt_number = self._previous_prompt_obj.number
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else:
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previous_prompt_number = 0
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else:
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previous_prompt_number = content['execution_count']
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if self._previous_prompt_obj and \
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self._previous_prompt_obj.number != previous_prompt_number:
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self._update_prompt(previous_prompt_number)
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self._previous_prompt_obj = None
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# Show a new prompt with the kernel's estimated prompt number.
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self._show_interpreter_prompt(previous_prompt_number + 1)
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#---------------------------------------------------------------------------
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# 'JupyterWidget' interface
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#---------------------------------------------------------------------------
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def set_default_style(self, colors='lightbg'):
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""" Sets the widget style to the class defaults.
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Parameters
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----------
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colors : str, optional (default lightbg)
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Whether to use the default light background or dark
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background or B&W style.
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"""
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colors = colors.lower()
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if colors=='lightbg':
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self.style_sheet = styles.default_light_style_sheet
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self.syntax_style = styles.default_light_syntax_style
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elif colors=='linux':
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self.style_sheet = styles.default_dark_style_sheet
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self.syntax_style = styles.default_dark_syntax_style
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elif colors=='nocolor':
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self.style_sheet = styles.default_bw_style_sheet
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self.syntax_style = styles.default_bw_syntax_style
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else:
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raise KeyError("No such color scheme: %s"%colors)
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#---------------------------------------------------------------------------
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# 'JupyterWidget' protected interface
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#---------------------------------------------------------------------------
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def _edit(self, filename, line=None):
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""" Opens a Python script for editing.
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Parameters
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----------
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filename : str
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A path to a local system file.
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line : int, optional
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A line of interest in the file.
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"""
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if self.custom_edit:
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self.custom_edit_requested.emit(filename, line)
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elif not self.editor:
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self._append_plain_text('No default editor available.\n'
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'Specify a GUI text editor in the `JupyterWidget.editor` '
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'configurable to enable the %edit magic')
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else:
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try:
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filename = '"%s"' % filename
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if line and self.editor_line:
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command = self.editor_line.format(filename=filename,
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line=line)
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else:
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try:
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command = self.editor.format()
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except KeyError:
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command = self.editor.format(filename=filename)
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|
else:
|
|
command += ' ' + filename
|
|
except KeyError:
|
|
self._append_plain_text('Invalid editor command.\n')
|
|
else:
|
|
try:
|
|
Popen(command, shell=True)
|
|
except OSError:
|
|
msg = 'Opening editor with command "%s" failed.\n'
|
|
self._append_plain_text(msg % command)
|
|
|
|
def _make_in_prompt(self, number, remote=False):
|
|
""" Given a prompt number, returns an HTML In prompt.
|
|
"""
|
|
try:
|
|
body = self.in_prompt % number
|
|
except TypeError:
|
|
# allow in_prompt to leave out number, e.g. '>>> '
|
|
from xml.sax.saxutils import escape
|
|
body = escape(self.in_prompt)
|
|
if remote:
|
|
body = self.other_output_prefix + body
|
|
return '<span class="in-prompt">%s</span>' % body
|
|
|
|
def _make_continuation_prompt(self, prompt, remote=False):
|
|
""" Given a plain text version of an In prompt, returns an HTML
|
|
continuation prompt.
|
|
"""
|
|
end_chars = '...: '
|
|
space_count = len(prompt.lstrip('\n')) - len(end_chars)
|
|
if remote:
|
|
space_count += len(self.other_output_prefix.rsplit('\n')[-1])
|
|
body = ' ' * space_count + end_chars
|
|
return '<span class="in-prompt">%s</span>' % body
|
|
|
|
def _make_out_prompt(self, number, remote=False):
|
|
""" Given a prompt number, returns an HTML Out prompt.
|
|
"""
|
|
try:
|
|
body = self.out_prompt % number
|
|
except TypeError:
|
|
# allow out_prompt to leave out number, e.g. '<<< '
|
|
from xml.sax.saxutils import escape
|
|
body = escape(self.out_prompt)
|
|
if remote:
|
|
body = self.other_output_prefix + body
|
|
return '<span class="out-prompt">%s</span>' % body
|
|
|
|
#------ Payload handlers --------------------------------------------------
|
|
|
|
# Payload handlers with a generic interface: each takes the opaque payload
|
|
# dict, unpacks it and calls the underlying functions with the necessary
|
|
# arguments.
|
|
|
|
def _handle_payload_edit(self, item):
|
|
self._edit(item['filename'], item['line_number'])
|
|
|
|
def _handle_payload_exit(self, item):
|
|
self._keep_kernel_on_exit = item['keepkernel']
|
|
self.exit_requested.emit(self)
|
|
|
|
def _handle_payload_next_input(self, item):
|
|
self.input_buffer = item['text']
|
|
|
|
def _handle_payload_page(self, item):
|
|
# Since the plain text widget supports only a very small subset of HTML
|
|
# and we have no control over the HTML source, we only page HTML
|
|
# payloads in the rich text widget.
|
|
data = item['data']
|
|
if 'text/html' in data and self.kind == 'rich':
|
|
self._page(data['text/html'], html=True)
|
|
else:
|
|
self._page(data['text/plain'], html=False)
|
|
|
|
#------ Trait change handlers --------------------------------------------
|
|
|
|
@observe('style_sheet')
|
|
def _style_sheet_changed(self, changed=None):
|
|
""" Set the style sheets of the underlying widgets.
|
|
"""
|
|
self.setStyleSheet(self.style_sheet)
|
|
if self._control is not None:
|
|
self._control.document().setDefaultStyleSheet(self.style_sheet)
|
|
|
|
if self._page_control is not None:
|
|
self._page_control.document().setDefaultStyleSheet(self.style_sheet)
|
|
|
|
@observe('syntax_style')
|
|
def _syntax_style_changed(self, changed=None):
|
|
""" Set the style for the syntax highlighter.
|
|
"""
|
|
if self._highlighter is None:
|
|
# ignore premature calls
|
|
return
|
|
if self.syntax_style:
|
|
self._highlighter.set_style(self.syntax_style)
|
|
self._ansi_processor.set_background_color(self.syntax_style)
|
|
else:
|
|
self._highlighter.set_style_sheet(self.style_sheet)
|
|
|
|
#------ Trait default initializers -----------------------------------------
|
|
|
|
@default('banner')
|
|
def _banner_default(self):
|
|
return "Jupyter QtConsole {version}\n".format(version=__version__)
|
|
|
|
|
|
# Clobber IPythonWidget above:
|
|
|
|
class IPythonWidget(JupyterWidget):
|
|
"""Deprecated class; use JupyterWidget."""
|
|
def __init__(self, *a, **kw):
|
|
warn("IPythonWidget is deprecated; use JupyterWidget",
|
|
DeprecationWarning)
|
|
super(IPythonWidget, self).__init__(*a, **kw)
|