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""" A FrontendWidget that emulates the interface of the console IPython and
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supports the additional functionality provided by the IPython kernel.
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"""
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#-----------------------------------------------------------------------------
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# Imports
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#-----------------------------------------------------------------------------
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# Standard library imports
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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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# System library imports
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from IPython.external.qt import QtCore, QtGui
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# Local imports
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from IPython.core.inputsplitter import IPythonInputSplitter, \
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transform_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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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.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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_transform_prompt = staticmethod(transform_ipy_prompt)
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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 = zmq_shell_source + '.edit_magic'
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_payload_source_exit = zmq_shell_source + '.ask_exit'
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_payload_source_next_input = zmq_shell_source + '.set_next_input'
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_payload_source_page = 'IPython.zmq.page.page'
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_retrying_history_request = 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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#---------------------------------------------------------------------------
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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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matches = rep['content']['matches']
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text = rep['content']['matched_text']
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offset = len(text)
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# Clean up matches with period and path separators if the matched
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# text has not been transformed. This is done by truncating all
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# but the last component and then suitably decreasing the offset
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# between the current cursor position and the start of completion.
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if len(matches) > 1 and matches[0][:offset] == text:
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parts = re.split(r'[./\\]', text)
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sep_count = len(parts) - 1
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if sep_count:
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chop_length = sum(map(len, parts[:sep_count])) + sep_count
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matches = [ match[chop_length:] for match in matches ]
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offset -= chop_length
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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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number = msg['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_manager.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:
|
|
|
items.append(cell)
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|
last_cell = cell
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|
self._set_history(items)
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|
def _handle_pyout(self, msg):
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|
""" Reimplemented for IPython-style "display hook".
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|
"""
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|
self.log.debug("pyout: %s", msg.get('content', ''))
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if not self._hidden and self._is_from_this_session(msg):
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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 data.has_key('text/html'):
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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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|
html = data['text/html']
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|
self._append_plain_text('\n', True)
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|
self._append_html(html + self.output_sep2, True)
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|
elif data.has_key('text/plain'):
|
|
|
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.
|
|
|
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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|
|
"""
|
|
|
self.log.debug("display: %s", msg.get('content', ''))
|
|
|
# For now, we don't display data from other frontends, but we
|
|
|
# eventually will as this allows all frontends to monitor the display
|
|
|
# data. But we need to figure out how to handle this in the GUI.
|
|
|
if not self._hidden and self._is_from_this_session(msg):
|
|
|
source = msg['content']['source']
|
|
|
data = msg['content']['data']
|
|
|
metadata = msg['content']['metadata']
|
|
|
# In the regular IPythonWidget, we simply print the plain text
|
|
|
# representation.
|
|
|
if data.has_key('text/html'):
|
|
|
html = data['text/html']
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|
|
self._append_html(html, True)
|
|
|
elif data.has_key('text/plain'):
|
|
|
text = data['text/plain']
|
|
|
self._append_plain_text(text, True)
|
|
|
# This newline seems to be needed for text and html output.
|
|
|
self._append_plain_text(u'\n', True)
|
|
|
|
|
|
def _started_channels(self):
|
|
|
""" Reimplemented to make a history request.
|
|
|
"""
|
|
|
super(IPythonWidget, self)._started_channels()
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|
|
self.kernel_manager.shell_channel.history(hist_access_type='tail',
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|
|
n=1000)
|
|
|
#---------------------------------------------------------------------------
|
|
|
# 'ConsoleWidget' public interface
|
|
|
#---------------------------------------------------------------------------
|
|
|
|
|
|
#---------------------------------------------------------------------------
|
|
|
# 'FrontendWidget' public interface
|
|
|
#---------------------------------------------------------------------------
|
|
|
|
|
|
def execute_file(self, path, hidden=False):
|
|
|
""" Reimplemented to use the 'run' magic.
|
|
|
"""
|
|
|
# Use forward slashes on Windows to avoid escaping each separator.
|
|
|
if sys.platform == 'win32':
|
|
|
path = os.path.normpath(path).replace('\\', '/')
|
|
|
|
|
|
# Perhaps we should not be using %run directly, but while we
|
|
|
# are, it is necessary to quote or escape filenames containing spaces
|
|
|
# or quotes.
|
|
|
|
|
|
# In earlier code here, to minimize escaping, we sometimes quoted the
|
|
|
# filename with single quotes. But to do this, this code must be
|
|
|
# platform-aware, because run uses shlex rather than python string
|
|
|
# parsing, so that:
|
|
|
# * In Win: single quotes can be used in the filename without quoting,
|
|
|
# and we cannot use single quotes to quote the filename.
|
|
|
# * In *nix: we can escape double quotes in a double quoted filename,
|
|
|
# but can't escape single quotes in a single quoted filename.
|
|
|
|
|
|
# So to keep this code non-platform-specific and simple, we now only
|
|
|
# use double quotes to quote filenames, and escape when needed:
|
|
|
if ' ' in path or "'" in path or '"' in path:
|
|
|
path = '"%s"' % path.replace('"', '\\"')
|
|
|
self.execute('%%run %s' % path, hidden=hidden)
|
|
|
|
|
|
#---------------------------------------------------------------------------
|
|
|
# 'FrontendWidget' protected interface
|
|
|
#---------------------------------------------------------------------------
|
|
|
|
|
|
def _complete(self):
|
|
|
""" Reimplemented to support IPython's improved completion machinery.
|
|
|
"""
|
|
|
# We let the kernel split the input line, so we *always* send an empty
|
|
|
# text field. Readline-based frontends do get a real text field which
|
|
|
# they can use.
|
|
|
text = ''
|
|
|
|
|
|
# Send the completion request to the kernel
|
|
|
msg_id = self.kernel_manager.shell_channel.complete(
|
|
|
text, # text
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|
|
self._get_input_buffer_cursor_line(), # line
|
|
|
self._get_input_buffer_cursor_column(), # cursor_pos
|
|
|
self.input_buffer) # block
|
|
|
pos = self._get_cursor().position()
|
|
|
info = self._CompletionRequest(msg_id, pos)
|
|
|
self._request_info['complete'] = info
|
|
|
|
|
|
def _process_execute_error(self, msg):
|
|
|
""" Reimplemented for IPython-style traceback formatting.
|
|
|
"""
|
|
|
content = msg['content']
|
|
|
traceback = '\n'.join(content['traceback']) + '\n'
|
|
|
if False:
|
|
|
# FIXME: For now, tracebacks come as plain text, so we can't use
|
|
|
# the html renderer yet. Once we refactor ultratb to produce
|
|
|
# properly styled tracebacks, this branch should be the default
|
|
|
traceback = traceback.replace(' ', ' ')
|
|
|
traceback = traceback.replace('\n', '<br/>')
|
|
|
|
|
|
ename = content['ename']
|
|
|
ename_styled = '<span class="error">%s</span>' % ename
|
|
|
traceback = traceback.replace(ename, ename_styled)
|
|
|
|
|
|
self._append_html(traceback)
|
|
|
else:
|
|
|
# This is the fallback for now, using plain text with ansi escapes
|
|
|
self._append_plain_text(traceback)
|
|
|
|
|
|
def _process_execute_payload(self, item):
|
|
|
""" Reimplemented to dispatch payloads to handler methods.
|
|
|
"""
|
|
|
handler = self._payload_handlers.get(item['source'])
|
|
|
if handler is None:
|
|
|
# We have no handler for this type of payload, simply ignore it
|
|
|
return False
|
|
|
else:
|
|
|
handler(item)
|
|
|
return True
|
|
|
|
|
|
def _show_interpreter_prompt(self, number=None):
|
|
|
""" Reimplemented for IPython-style prompts.
|
|
|
"""
|
|
|
# If a number was not specified, make a prompt number request.
|
|
|
if number is None:
|
|
|
msg_id = self.kernel_manager.shell_channel.execute('', silent=True)
|
|
|
info = self._ExecutionRequest(msg_id, 'prompt')
|
|
|
self._request_info['execute'][msg_id] = info
|
|
|
return
|
|
|
|
|
|
# Show a new prompt and save information about it so that it can be
|
|
|
# updated later if the prompt number turns out to be wrong.
|
|
|
self._prompt_sep = self.input_sep
|
|
|
self._show_prompt(self._make_in_prompt(number), html=True)
|
|
|
block = self._control.document().lastBlock()
|
|
|
length = len(self._prompt)
|
|
|
self._previous_prompt_obj = self._PromptBlock(block, length, number)
|
|
|
|
|
|
# Update continuation prompt to reflect (possibly) new prompt length.
|
|
|
self._set_continuation_prompt(
|
|
|
self._make_continuation_prompt(self._prompt), html=True)
|
|
|
|
|
|
def _show_interpreter_prompt_for_reply(self, msg):
|
|
|
""" Reimplemented for IPython-style prompts.
|
|
|
"""
|
|
|
# Update the old prompt number if necessary.
|
|
|
content = msg['content']
|
|
|
# abort replies do not have any keys:
|
|
|
if content['status'] == 'aborted':
|
|
|
if self._previous_prompt_obj:
|
|
|
previous_prompt_number = self._previous_prompt_obj.number
|
|
|
else:
|
|
|
previous_prompt_number = 0
|
|
|
else:
|
|
|
previous_prompt_number = content['execution_count']
|
|
|
if self._previous_prompt_obj and \
|
|
|
self._previous_prompt_obj.number != previous_prompt_number:
|
|
|
block = self._previous_prompt_obj.block
|
|
|
|
|
|
# Make sure the prompt block has not been erased.
|
|
|
if block.isValid() and block.text():
|
|
|
|
|
|
# Remove the old prompt and insert a new prompt.
|
|
|
cursor = QtGui.QTextCursor(block)
|
|
|
cursor.movePosition(QtGui.QTextCursor.Right,
|
|
|
QtGui.QTextCursor.KeepAnchor,
|
|
|
self._previous_prompt_obj.length)
|
|
|
prompt = self._make_in_prompt(previous_prompt_number)
|
|
|
self._prompt = self._insert_html_fetching_plain_text(
|
|
|
cursor, prompt)
|
|
|
|
|
|
# When the HTML is inserted, Qt blows away the syntax
|
|
|
# highlighting for the line, so we need to rehighlight it.
|
|
|
self._highlighter.rehighlightBlock(cursor.block())
|
|
|
|
|
|
self._previous_prompt_obj = None
|
|
|
|
|
|
# Show a new prompt with the kernel's estimated prompt number.
|
|
|
self._show_interpreter_prompt(previous_prompt_number + 1)
|
|
|
|
|
|
#---------------------------------------------------------------------------
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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)
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Whether to use the default IPython 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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# 'IPythonWidget' 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 `IPythonWidget.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:
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command += ' ' + filename
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except KeyError:
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self._append_plain_text('Invalid editor command.\n')
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else:
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try:
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Popen(command, shell=True)
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except OSError:
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msg = 'Opening editor with command "%s" failed.\n'
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self._append_plain_text(msg % command)
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def _make_in_prompt(self, number):
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""" Given a prompt number, returns an HTML In prompt.
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"""
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try:
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body = self.in_prompt % number
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except TypeError:
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# allow in_prompt to leave out number, e.g. '>>> '
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body = self.in_prompt
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return '<span class="in-prompt">%s</span>' % body
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def _make_continuation_prompt(self, prompt):
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""" Given a plain text version of an In prompt, returns an HTML
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continuation prompt.
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"""
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end_chars = '...: '
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space_count = len(prompt.lstrip('\n')) - len(end_chars)
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body = ' ' * space_count + end_chars
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return '<span class="in-prompt">%s</span>' % body
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def _make_out_prompt(self, number):
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""" Given a prompt number, returns an HTML Out prompt.
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"""
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body = self.out_prompt % number
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return '<span class="out-prompt">%s</span>' % body
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#------ Payload handlers --------------------------------------------------
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# Payload handlers with a generic interface: each takes the opaque payload
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# dict, unpacks it and calls the underlying functions with the necessary
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# arguments.
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def _handle_payload_edit(self, item):
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self._edit(item['filename'], item['line_number'])
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def _handle_payload_exit(self, item):
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self._keep_kernel_on_exit = item['keepkernel']
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self.exit_requested.emit(self)
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def _handle_payload_next_input(self, item):
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self.input_buffer = dedent(item['text'].rstrip())
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def _handle_payload_page(self, item):
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# Since the plain text widget supports only a very small subset of HTML
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# and we have no control over the HTML source, we only page HTML
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# payloads in the rich text widget.
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if item['html'] and self.kind == 'rich':
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self._page(item['html'], html=True)
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else:
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self._page(item['text'], html=False)
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#------ Trait change handlers --------------------------------------------
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def _style_sheet_changed(self):
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""" Set the style sheets of the underlying widgets.
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"""
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self.setStyleSheet(self.style_sheet)
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if self._control is not None:
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self._control.document().setDefaultStyleSheet(self.style_sheet)
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bg_color = self._control.palette().window().color()
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self._ansi_processor.set_background_color(bg_color)
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if self._page_control is not None:
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self._page_control.document().setDefaultStyleSheet(self.style_sheet)
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def _syntax_style_changed(self):
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""" Set the style for the syntax highlighter.
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"""
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if self._highlighter is None:
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# ignore premature calls
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return
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if self.syntax_style:
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self._highlighter.set_style(self.syntax_style)
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else:
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self._highlighter.set_style_sheet(self.style_sheet)
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#------ Trait default initializers -----------------------------------------
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def _banner_default(self):
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from IPython.core.usage import default_gui_banner
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return default_gui_banner
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