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"""A FrontendWidget that emulates the interface of the console IPython.
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This supports the additional functionality provided by the IPython kernel.
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"""
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# Copyright (c) IPython Development Team.
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# Distributed under the terms of the Modified BSD License.
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from 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 IPython.external.qt import QtCore, QtGui
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from IPython.core.inputsplitter import IPythonInputSplitter
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from IPython.core.release import version
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from IPython.core.inputtransformer import ipy_prompt
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from IPython.utils.traitlets import Bool, Unicode
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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 = 'IPython.kernel.zmq.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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# IPythonWidget class
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#-----------------------------------------------------------------------------
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class IPythonWidget(FrontendWidget):
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""" A FrontendWidget for an IPython kernel.
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"""
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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 system 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.
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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. IPython: .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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# FrontendWidget protected class variables.
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_input_splitter_class = IPythonInputSplitter
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_prompt_transformer = IPythonInputSplitter(physical_line_transforms=[ipy_prompt()],
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logical_line_transforms=[],
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python_line_transforms=[],
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)
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# IPythonWidget 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(IPythonWidget, self).__init__(*args, **kw)
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# IPythonWidget 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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self._guiref_loaded = False
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#---------------------------------------------------------------------------
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# 'BaseFrontendMixin' abstract interface
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#---------------------------------------------------------------------------
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def _handle_complete_reply(self, rep):
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""" Reimplemented to support IPython'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'] and \
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info.pos == cursor.position():
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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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offset = end - start
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# Move the cursor to the start of the match and 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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""" Reimplemented to 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(IPythonWidget, self)._handle_execute_reply(msg)
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def _handle_history_reply(self, msg):
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""" Implemented to handle history tail replies, which are only supported
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by the IPython kernel.
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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.shell_channel.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 _handle_execute_result(self, msg):
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""" Reimplemented for IPython-style "display hook".
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"""
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self.log.debug("execute_result: %s", msg.get('content', ''))
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if not self._hidden and self._is_from_this_session(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, True)
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self._append_html(self._make_out_prompt(prompt_number), True)
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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', True)
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self._append_plain_text(text + self.output_sep2, 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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"""
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self.log.debug("display: %s", msg.get('content', ''))
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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 not self._hidden and self._is_from_this_session(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 IPythonWidget, 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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if not self._guiref_loaded:
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if content.get('language') == 'python':
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self._load_guiref_magic()
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self._guiref_loaded = True
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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(IPythonWidget, self)._started_channels()
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def _started_channels(self):
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"""Reimplemented to make a history request and load %guiref."""
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self._starting = True
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# The reply will trigger %guiref load provided language=='python'
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self.kernel_client.kernel_info()
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self.kernel_client.shell_channel.history(hist_access_type='tail',
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n=1000)
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def _load_guiref_magic(self):
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"""Load %guiref magic."""
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self.kernel_client.shell_channel.execute('\n'.join([
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"try:",
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" _usage",
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"except:",
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" from IPython.core import usage as _usage",
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" get_ipython().register_magic_function(_usage.page_guiref, 'line', 'guiref')",
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" del _usage",
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]), silent=True)
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#---------------------------------------------------------------------------
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# 'ConsoleWidget' public interface
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#---------------------------------------------------------------------------
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#---------------------------------------------------------------------------
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# 'FrontendWidget' public interface
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#---------------------------------------------------------------------------
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def execute_file(self, path, hidden=False):
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""" Reimplemented to use the 'run' magic.
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"""
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# Use forward slashes on Windows to avoid escaping each separator.
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if sys.platform == 'win32':
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path = os.path.normpath(path).replace('\\', '/')
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# Perhaps we should not be using %run directly, but while we
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# are, it is necessary to quote or escape filenames containing spaces
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# or quotes.
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# In earlier code here, to minimize escaping, we sometimes quoted the
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# filename with single quotes. But to do this, this code must be
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# platform-aware, because run uses shlex rather than python string
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# parsing, so that:
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# * In Win: single quotes can be used in the filename without quoting,
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# and we cannot use single quotes to quote the filename.
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# * In *nix: we can escape double quotes in a double quoted filename,
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# but can't escape single quotes in a single quoted filename.
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# So to keep this code non-platform-specific and simple, we now only
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# use double quotes to quote filenames, and escape when needed:
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if ' ' in path or "'" in path or '"' in path:
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path = '"%s"' % path.replace('"', '\\"')
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self.execute('%%run %s' % path, hidden=hidden)
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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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""" Reimplemented for IPython-style traceback formatting.
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"""
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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 use
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# the html renderer yet. Once we refactor ultratb to produce
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# properly styled tracebacks, this branch should be the 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 escapes
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self._append_plain_text(traceback)
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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.shell_channel.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 _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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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(previous_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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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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# 'IPythonWidget' 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)
|
|
|
Whether to use the default IPython light background or dark
|
|
|
background or B&W style.
|
|
|
"""
|
|
|
colors = colors.lower()
|
|
|
if colors=='lightbg':
|
|
|
self.style_sheet = styles.default_light_style_sheet
|
|
|
self.syntax_style = styles.default_light_syntax_style
|
|
|
elif colors=='linux':
|
|
|
self.style_sheet = styles.default_dark_style_sheet
|
|
|
self.syntax_style = styles.default_dark_syntax_style
|
|
|
elif colors=='nocolor':
|
|
|
self.style_sheet = styles.default_bw_style_sheet
|
|
|
self.syntax_style = styles.default_bw_syntax_style
|
|
|
else:
|
|
|
raise KeyError("No such color scheme: %s"%colors)
|
|
|
|
|
|
#---------------------------------------------------------------------------
|
|
|
# 'IPythonWidget' protected interface
|
|
|
#---------------------------------------------------------------------------
|
|
|
|
|
|
def _edit(self, filename, line=None):
|
|
|
""" Opens a Python script for editing.
|
|
|
|
|
|
Parameters
|
|
|
----------
|
|
|
filename : str
|
|
|
A path to a local system file.
|
|
|
|
|
|
line : int, optional
|
|
|
A line of interest in the file.
|
|
|
"""
|
|
|
if self.custom_edit:
|
|
|
self.custom_edit_requested.emit(filename, line)
|
|
|
elif not self.editor:
|
|
|
self._append_plain_text('No default editor available.\n'
|
|
|
'Specify a GUI text editor in the `IPythonWidget.editor` '
|
|
|
'configurable to enable the %edit magic')
|
|
|
else:
|
|
|
try:
|
|
|
filename = '"%s"' % filename
|
|
|
if line and self.editor_line:
|
|
|
command = self.editor_line.format(filename=filename,
|
|
|
line=line)
|
|
|
else:
|
|
|
try:
|
|
|
command = self.editor.format()
|
|
|
except KeyError:
|
|
|
command = self.editor.format(filename=filename)
|
|
|
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):
|
|
|
""" 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)
|
|
|
return '<span class="in-prompt">%s</span>' % body
|
|
|
|
|
|
def _make_continuation_prompt(self, prompt):
|
|
|
""" 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)
|
|
|
body = ' ' * space_count + end_chars
|
|
|
return '<span class="in-prompt">%s</span>' % body
|
|
|
|
|
|
def _make_out_prompt(self, number):
|
|
|
""" 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)
|
|
|
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 --------------------------------------------
|
|
|
|
|
|
def _style_sheet_changed(self):
|
|
|
""" 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)
|
|
|
bg_color = self._control.palette().window().color()
|
|
|
self._ansi_processor.set_background_color(bg_color)
|
|
|
|
|
|
if self._page_control is not None:
|
|
|
self._page_control.document().setDefaultStyleSheet(self.style_sheet)
|
|
|
|
|
|
|
|
|
|
|
|
def _syntax_style_changed(self):
|
|
|
""" 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)
|
|
|
else:
|
|
|
self._highlighter.set_style_sheet(self.style_sheet)
|
|
|
|
|
|
#------ Trait default initializers -----------------------------------------
|
|
|
|
|
|
def _banner_default(self):
|
|
|
return "IPython QtConsole {version}\n".format(version=version)
|
|
|
|
