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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 prompts.
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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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#-----------------------------------------------------------------------------
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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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# 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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#---------------------------------------------------------------------------
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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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cursor = self._get_cursor()
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if rep['parent_header']['msg_id'] == self._complete_id and \
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cursor.position() == self._complete_pos:
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matches = rep['content']['matches']
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text = rep['content']['matched_text']
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# Clean up matches with '.'s and path separators.
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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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text = text[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=len(text))
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self._complete_with_items(cursor, matches)
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def _handle_history_reply(self, msg):
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""" Implemented to handle history replies, which are only supported by
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the IPython kernel.
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"""
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history_dict = msg['content']['history']
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items = [ history_dict[key] for key in sorted(history_dict.keys()) ]
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self._set_history(items)
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def _handle_prompt_reply(self, msg):
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""" Implemented to handle prompt number replies, which are only
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supported by the IPython kernel.
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"""
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content = msg['content']
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self._show_interpreter_prompt(content['prompt_number'],
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content['input_sep'])
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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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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['prompt_number']
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self._append_plain_text(content['output_sep'])
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self._append_html(self._make_out_prompt(prompt_number))
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self._append_plain_text(content['data'] + '\n' +
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content['output_sep2'])
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def _started_channels(self):
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""" Reimplemented to make a history request.
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"""
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super(IPythonWidget, self)._started_channels()
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# FIXME: Disabled until history requests are properly implemented.
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#self.kernel_manager.xreq_channel.history(raw=True, output=False)
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#---------------------------------------------------------------------------
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# 'FrontendWidget' 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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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 _complete(self):
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""" Reimplemented to support IPython's improved completion machinery.
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"""
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# We let the kernel split the input line, so we *always* send an empty
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# text field. Readline-based frontends do get a real text field which
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# they can use.
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text = ''
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# Send the completion request to the kernel
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self._complete_id = self.kernel_manager.xreq_channel.complete(
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text, # text
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self._get_input_buffer_cursor_line(), # line
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self._get_input_buffer_cursor_column(), # cursor_pos
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self.input_buffer) # block
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self._complete_pos = self._get_cursor().position()
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def _get_banner(self):
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""" Reimplemented to return IPython's default banner.
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"""
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return default_banner + '\n'
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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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|
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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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|
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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 handle %edit and paging payloads.
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|
"""
|
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|
if item['source'] == self._payload_source_edit:
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self._edit(item['filename'], item['line_number'])
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|
return True
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|
elif item['source'] == self._payload_source_page:
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self._page(item['data'])
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return True
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else:
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return False
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|
def _show_interpreter_prompt(self, number=None, input_sep='\n'):
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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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|
self.kernel_manager.xreq_channel.prompt()
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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 = 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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previous_prompt_number = content['prompt_number']
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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 not block.text().isEmpty():
|
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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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|
next_prompt = content['next_prompt']
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self._show_interpreter_prompt(next_prompt['prompt_number'],
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next_prompt['input_sep'])
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|
|
|
#---------------------------------------------------------------------------
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|
# 'IPythonWidget' interface
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|
#---------------------------------------------------------------------------
|
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|
|
|
def set_default_style(self, lightbg=True):
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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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|
|
lightbg : bool, optional (default True)
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|
Whether to use the default IPython light background or dark
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|
background style.
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|
"""
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|
|
if lightbg:
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self.style_sheet = default_light_style_sheet
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|
self.syntax_style = default_light_syntax_style
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|
else:
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self.style_sheet = default_dark_style_sheet
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|
|
self.syntax_style = default_dark_syntax_style
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|
|
|
#---------------------------------------------------------------------------
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|
|
# 'IPythonWidget' protected interface
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#---------------------------------------------------------------------------
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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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|
"""
|
|
|
if self.custom_edit:
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|
self.custom_edit_requested.emit(filename, line)
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|
elif self.editor == 'default':
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|
self._append_plain_text('No default editor available.\n')
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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:
|
|
|
command = self.editor.format(filename=filename)
|
|
|
else:
|
|
|
command += ' ' + filename
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|
|
except KeyError:
|
|
|
self._append_plain_text('Invalid editor command.\n')
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|
|
else:
|
|
|
try:
|
|
|
Popen(command, shell=True)
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|
|
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
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|
|
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 = '...: '
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|
|
space_count = len(prompt.lstrip('\n')) - len(end_chars)
|
|
|
body = ' ' * space_count + end_chars
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|
|
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 ---------------------------------------------
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|
|
|
|
|
def _style_sheet_changed(self):
|
|
|
""" Set the style sheets of the underlying widgets.
|
|
|
"""
|
|
|
self.setStyleSheet(self.style_sheet)
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|
|
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)
|
|
|
|
|
|
|
