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# Standard library imports
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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 frontend_widget import FrontendWidget
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class IPythonPromptBlock(object):
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""" An internal storage object for IPythonWidget.
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"""
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def __init__(self, block, length, number):
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self.block = block
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self.length = length
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self.number = number
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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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# Signal emitted when an editor is needed for a file and the editor has been
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# specified as 'custom'. See 'set_editor' for more information.
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custom_edit_requested = QtCore.pyqtSignal(object, int)
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# The default stylesheet: black text on a white background.
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default_stylesheet = """
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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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# A dark stylesheet: white text on a black background.
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dark_stylesheet = """
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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 prompts.
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in_prompt = 'In [<span class="in-prompt-number">%i</span>]: '
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out_prompt = 'Out[<span class="out-prompt-number">%i</span>]: '
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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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_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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# Set a default editor and stylesheet.
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self.set_editor('default')
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self.reset_styling()
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#---------------------------------------------------------------------------
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# 'BaseFrontendMixin' abstract interface
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#---------------------------------------------------------------------------
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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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#---------------------------------------------------------------------------
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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 _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_lines = content['traceback'][:]
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traceback = ''.join(traceback_lines)
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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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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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# TODO: If a number was not specified, make a prompt number request.
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if number is None:
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number = 0
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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._append_plain_text(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 = IPythonPromptBlock(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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if block.isValid():
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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 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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Raises:
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-------
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OSError
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If the editor command cannot be executed.
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"""
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if self._editor == 'default':
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url = QtCore.QUrl.fromLocalFile(filename)
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if not QtGui.QDesktopServices.openUrl(url):
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message = 'Failed to open %s with the default application'
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raise OSError(message % repr(filename))
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elif self._editor is None:
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self.custom_edit_requested.emit(filename, line)
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else:
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Popen(self._editor + [filename])
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def reset_styling(self):
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""" Restores the default IPythonWidget styling.
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"""
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self.set_styling(self.default_stylesheet, syntax_style='default')
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#self.set_styling(self.dark_stylesheet, syntax_style='monokai')
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def set_editor(self, editor):
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""" Sets the editor to use with the %edit magic.
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Parameters:
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-----------
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editor : str or sequence of str
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A command suitable for use with Popen. This command will be executed
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with a single argument--a filename--when editing is requested.
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This parameter also takes two special values:
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'default' : Files will be edited with the system default
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application for Python files.
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'custom' : Emit a 'custom_edit_requested(str, int)' signal
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instead of opening an editor.
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"""
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if editor == 'default':
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self._editor = 'default'
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elif editor == 'custom':
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self._editor = None
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elif isinstance(editor, basestring):
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self._editor = [ editor ]
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else:
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self._editor = list(editor)
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def set_styling(self, stylesheet, syntax_style=None):
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""" Sets the IPythonWidget styling.
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Parameters:
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-----------
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stylesheet : str
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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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syntax_style : str or None [default None]
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If specified, use the Pygments style with given name. Otherwise,
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the stylesheet is queried for Pygments style information.
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"""
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self.setStyleSheet(stylesheet)
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self._control.document().setDefaultStyleSheet(stylesheet)
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if self._page_control:
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self._page_control.document().setDefaultStyleSheet(stylesheet)
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if syntax_style is None:
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self._highlighter.set_style_sheet(stylesheet)
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else:
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self._highlighter.set_style(syntax_style)
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#---------------------------------------------------------------------------
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# 'IPythonWidget' protected interface
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#---------------------------------------------------------------------------
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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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body = self.in_prompt % number
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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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