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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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TODO: Add support for retrieving the system default editor. Requires code
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|
paths for Windows (use the registry), Mac OS (use LaunchServices), and
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Linux (use the xdg system).
|
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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 re
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from subprocess import Popen
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# System library imports
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from PyQt4 import QtCore, QtGui
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# Local imports
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from IPython.core.inputsplitter import IPythonInputSplitter
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from IPython.core.usage import default_banner
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from IPython.utils.traitlets import Bool, Str
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from frontend_widget import FrontendWidget
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#-----------------------------------------------------------------------------
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# Constants
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#-----------------------------------------------------------------------------
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# The default light style sheet: black text on a white background.
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default_light_style_sheet = '''
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.error { color: red; }
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.in-prompt { color: navy; }
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.in-prompt-number { font-weight: bold; }
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.out-prompt { color: darkred; }
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.out-prompt-number { font-weight: bold; }
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'''
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default_light_syntax_style = 'default'
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# The default dark style sheet: white text on a black background.
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default_dark_style_sheet = '''
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QPlainTextEdit, QTextEdit { background-color: black; color: white }
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QFrame { border: 1px solid grey; }
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.error { color: red; }
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.in-prompt { color: lime; }
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.in-prompt-number { color: lime; font-weight: bold; }
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.out-prompt { color: red; }
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.out-prompt-number { color: red; font-weight: bold; }
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'''
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default_dark_syntax_style = 'monokai'
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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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#-----------------------------------------------------------------------------
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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.pyqtSignal(object, object)
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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 will
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# be appended to the end the command.
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editor = Str('default', config=True)
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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 magic
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# will be ignored.
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editor_line = Str(config=True)
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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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style_sheet = Str(config=True)
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# If not empty, use this Pygments style for syntax highlighting. Otherwise,
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# the style sheet is queried for Pygments style information.
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syntax_style = Str(config=True)
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# Prompts.
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in_prompt = Str(default_in_prompt, config=True)
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out_prompt = Str(default_out_prompt, config=True)
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input_sep = Str(default_input_sep, config=True)
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output_sep = Str(default_output_sep, config=True)
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output_sep2 = Str(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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# IPythonWidget protected class variables.
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|
_PromptBlock = namedtuple('_PromptBlock', ['block', 'length', 'number'])
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_payload_source_edit = 'IPython.zmq.zmqshell.ZMQInteractiveShell.edit_magic'
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|
_payload_source_page = 'IPython.zmq.page.page'
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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._previous_prompt_obj = 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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|
|
#---------------------------------------------------------------------------
|
|
|
# '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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|
"""
|
|
|
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
|
|
|
# text has not been transformed. This is done by truncating all
|
|
|
# but the last component and then suitably decreasing the offset
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|
# between the current cursor position and the start of completion.
|
|
|
if len(matches) > 1 and matches[0][:offset] == text:
|
|
|
parts = re.split(r'[./\\]', text)
|
|
|
sep_count = len(parts) - 1
|
|
|
if sep_count:
|
|
|
chop_length = sum(map(len, parts[:sep_count])) + sep_count
|
|
|
matches = [ match[chop_length:] for match in matches ]
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|
|
offset -= chop_length
|
|
|
|
|
|
# Move the cursor to the start of the match and complete.
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|
|
cursor.movePosition(QtGui.QTextCursor.Left, n=offset)
|
|
|
self._complete_with_items(cursor, matches)
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|
|
|
def _handle_execute_reply(self, msg):
|
|
|
""" Reimplemented to support prompt requests.
|
|
|
"""
|
|
|
info = self._request_info.get('execute')
|
|
|
if info and info.id == msg['parent_header']['msg_id']:
|
|
|
if info.kind == 'prompt':
|
|
|
number = msg['content']['execution_count'] + 1
|
|
|
self._show_interpreter_prompt(number)
|
|
|
else:
|
|
|
super(IPythonWidget, self)._handle_execute_reply(msg)
|
|
|
|
|
|
def _handle_history_reply(self, msg):
|
|
|
""" Implemented to handle history replies, which are only supported by
|
|
|
the IPython kernel.
|
|
|
"""
|
|
|
history_dict = msg['content']['history']
|
|
|
items = [ history_dict[key] for key in sorted(history_dict.keys()) ]
|
|
|
self._set_history(items)
|
|
|
|
|
|
def _handle_pyout(self, msg):
|
|
|
""" Reimplemented for IPython-style "display hook".
|
|
|
"""
|
|
|
if not self._hidden and self._is_from_this_session(msg):
|
|
|
content = msg['content']
|
|
|
prompt_number = content['execution_count']
|
|
|
self._append_plain_text(self.output_sep)
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|
|
self._append_html(self._make_out_prompt(prompt_number))
|
|
|
self._append_plain_text(content['data']+self.output_sep2)
|
|
|
|
|
|
def _started_channels(self):
|
|
|
""" Reimplemented to make a history request.
|
|
|
"""
|
|
|
super(IPythonWidget, self)._started_channels()
|
|
|
# FIXME: Disabled until history requests are properly implemented.
|
|
|
#self.kernel_manager.xreq_channel.history(raw=True, output=False)
|
|
|
|
|
|
#---------------------------------------------------------------------------
|
|
|
# 'FrontendWidget' interface
|
|
|
#---------------------------------------------------------------------------
|
|
|
|
|
|
def execute_file(self, path, hidden=False):
|
|
|
""" Reimplemented to use the 'run' magic.
|
|
|
"""
|
|
|
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.xreq_channel.complete(
|
|
|
text, # text
|
|
|
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 _get_banner(self):
|
|
|
""" Reimplemented to return IPython's default banner.
|
|
|
"""
|
|
|
return default_banner + '\n'
|
|
|
|
|
|
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 handle %edit and paging payloads.
|
|
|
"""
|
|
|
if item['source'] == self._payload_source_edit:
|
|
|
self._edit(item['filename'], item['line_number'])
|
|
|
return True
|
|
|
elif item['source'] == self._payload_source_page:
|
|
|
self._page(item['data'])
|
|
|
return True
|
|
|
else:
|
|
|
return False
|
|
|
|
|
|
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.xreq_channel.execute('', silent=True)
|
|
|
info = self._ExecutionRequest(msg_id, 'prompt')
|
|
|
self._request_info['execute'] = 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']
|
|
|
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 not block.text().isEmpty():
|
|
|
|
|
|
# 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)
|
|
|
|
|
|
#---------------------------------------------------------------------------
|
|
|
# 'IPythonWidget' interface
|
|
|
#---------------------------------------------------------------------------
|
|
|
|
|
|
def set_default_style(self, lightbg=True):
|
|
|
""" Sets the widget style to the class defaults.
|
|
|
|
|
|
Parameters:
|
|
|
-----------
|
|
|
lightbg : bool, optional (default True)
|
|
|
Whether to use the default IPython light background or dark
|
|
|
background style.
|
|
|
"""
|
|
|
if lightbg:
|
|
|
self.style_sheet = default_light_style_sheet
|
|
|
self.syntax_style = default_light_syntax_style
|
|
|
else:
|
|
|
self.style_sheet = default_dark_style_sheet
|
|
|
self.syntax_style = default_dark_syntax_style
|
|
|
|
|
|
#---------------------------------------------------------------------------
|
|
|
# '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 self.editor == 'default':
|
|
|
self._append_plain_text('No default editor available.\n')
|
|
|
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.
|
|
|
"""
|
|
|
body = self.in_prompt % number
|
|
|
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.
|
|
|
"""
|
|
|
body = self.out_prompt % number
|
|
|
return '<span class="out-prompt">%s</span>' % body
|
|
|
|
|
|
#------ Trait change handlers ---------------------------------------------
|
|
|
|
|
|
def _style_sheet_changed(self):
|
|
|
""" Set the style sheets of the underlying widgets.
|
|
|
"""
|
|
|
self.setStyleSheet(self.style_sheet)
|
|
|
self._control.document().setDefaultStyleSheet(self.style_sheet)
|
|
|
if self._page_control:
|
|
|
self._page_control.document().setDefaultStyleSheet(self.style_sheet)
|
|
|
|
|
|
bg_color = self._control.palette().background().color()
|
|
|
self._ansi_processor.set_background_color(bg_color)
|
|
|
|
|
|
def _syntax_style_changed(self):
|
|
|
""" Set the style for the syntax highlighter.
|
|
|
"""
|
|
|
if self.syntax_style:
|
|
|
self._highlighter.set_style(self.syntax_style)
|
|
|
else:
|
|
|
self._highlighter.set_style_sheet(self.style_sheet)
|
|
|
|
|
|
|
