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console_widget.py
625 lines | 22.4 KiB | text/x-python | PythonLexer
# encoding: utf-8
"""
A Wx widget to act as a console and input commands.
This widget deals with prompts and provides an edit buffer
restricted to after the last prompt.
"""
__docformat__ = "restructuredtext en"
#-------------------------------------------------------------------------------
# Copyright (C) 2008-2011 The IPython Development Team
#
# Distributed under the terms of the BSD License. The full license is
# in the file COPYING, distributed as part of this software.
#-------------------------------------------------------------------------------
#-------------------------------------------------------------------------------
# Imports
#-------------------------------------------------------------------------------
import wx
import wx.stc as stc
from wx.py import editwindow
import time
import sys
import string
LINESEP = '\n'
if sys.platform == 'win32':
LINESEP = '\n\r'
import re
# FIXME: Need to provide an API for non user-generated display on the
# screen: this should not be editable by the user.
#-------------------------------------------------------------------------------
# Constants
#-------------------------------------------------------------------------------
_COMPLETE_BUFFER_MARKER = 31
_ERROR_MARKER = 30
_INPUT_MARKER = 29
_DEFAULT_SIZE = 10
if sys.platform == 'darwin':
_DEFAULT_SIZE = 12
_DEFAULT_STYLE = {
#background definition
'default' : 'size:%d' % _DEFAULT_SIZE,
'bracegood' : 'fore:#00AA00,back:#000000,bold',
'bracebad' : 'fore:#FF0000,back:#000000,bold',
# Edge column: a number of None
'edge_column' : -1,
# properties for the various Python lexer styles
'comment' : 'fore:#007F00',
'number' : 'fore:#007F7F',
'string' : 'fore:#7F007F,italic',
'char' : 'fore:#7F007F,italic',
'keyword' : 'fore:#00007F,bold',
'triple' : 'fore:#7F0000',
'tripledouble' : 'fore:#7F0000',
'class' : 'fore:#0000FF,bold,underline',
'def' : 'fore:#007F7F,bold',
'operator' : 'bold',
# Default colors
'trace' : '#FAFAF1', # Nice green
'stdout' : '#FDFFD3', # Nice yellow
'stderr' : '#FFF1F1', # Nice red
# Default scintilla settings
'antialiasing' : True,
'carret_color' : 'BLACK',
'background_color' :'WHITE',
#prompt definition
'prompt_in1' : \
'\n\x01\x1b[0;34m\x02In [\x01\x1b[1;34m\x02$number\x01\x1b[0;34m\x02]: \x01\x1b[0m\x02',
'prompt_out': \
'\x01\x1b[0;31m\x02Out[\x01\x1b[1;31m\x02$number\x01\x1b[0;31m\x02]: \x01\x1b[0m\x02',
}
# new style numbers
_STDOUT_STYLE = 15
_STDERR_STYLE = 16
_TRACE_STYLE = 17
# system colors
#SYS_COLOUR_BACKGROUND = wx.SystemSettings.GetColour(wx.SYS_COLOUR_BACKGROUND)
# Translation table from ANSI escape sequences to color.
ANSI_STYLES = {'0;30': [0, 'BLACK'], '0;31': [1, 'RED'],
'0;32': [2, 'GREEN'], '0;33': [3, 'BROWN'],
'0;34': [4, 'BLUE'], '0;35': [5, 'PURPLE'],
'0;36': [6, 'CYAN'], '0;37': [7, 'LIGHT GREY'],
'1;30': [8, 'DARK GREY'], '1;31': [9, 'RED'],
'1;32': [10, 'SEA GREEN'], '1;33': [11, 'YELLOW'],
'1;34': [12, 'LIGHT BLUE'], '1;35':
[13, 'MEDIUM VIOLET RED'],
'1;36': [14, 'LIGHT STEEL BLUE'], '1;37': [15, 'YELLOW']}
# XXX: Maybe one day we should factor this code with coloransi. Right now
# coloransi is hard to reuse and makes our code more complex.
#we define platform specific fonts
if wx.Platform == '__WXMSW__':
FACES = { 'times': 'Times New Roman',
'mono' : 'Courier New',
'helv' : 'Arial',
'other': 'Comic Sans MS',
'size' : 10,
'size2': 8,
}
elif wx.Platform == '__WXMAC__':
FACES = { 'times': 'Times New Roman',
'mono' : 'Monaco',
'helv' : 'Arial',
'other': 'Comic Sans MS',
'size' : 10,
'size2': 8,
}
else:
FACES = { 'times': 'Times',
'mono' : 'Courier',
'helv' : 'Helvetica',
'other': 'new century schoolbook',
'size' : 10,
'size2': 8,
}
#-----------------------------------------------------------------------------
# The console widget class
#-----------------------------------------------------------------------------
class ConsoleWidget(editwindow.EditWindow):
""" Specialized styled text control view for console-like workflow.
This widget is mainly interested in dealing with the prompt and
keeping the cursor inside the editing line.
"""
# This is where the title captured from the ANSI escape sequences are
# stored.
title = 'Console'
# Last prompt printed
last_prompt = ''
# The buffer being edited.
def _set_input_buffer(self, string):
self.SetSelection(self.current_prompt_pos, self.GetLength())
self.ReplaceSelection(string)
self.GotoPos(self.GetLength())
def _get_input_buffer(self):
""" Returns the text in current edit buffer.
"""
input_buffer = self.GetTextRange(self.current_prompt_pos,
self.GetLength())
input_buffer = input_buffer.replace(LINESEP, '\n')
return input_buffer
input_buffer = property(_get_input_buffer, _set_input_buffer)
style = _DEFAULT_STYLE.copy()
# Translation table from ANSI escape sequences to color. Override
# this to specify your colors.
ANSI_STYLES = ANSI_STYLES.copy()
# Font faces
faces = FACES.copy()
# Store the last time a refresh was done
_last_refresh_time = 0
#--------------------------------------------------------------------------
# Public API
#--------------------------------------------------------------------------
def __init__(self, parent, id=wx.ID_ANY, pos=wx.DefaultPosition,
size=wx.DefaultSize, style=wx.WANTS_CHARS, ):
editwindow.EditWindow.__init__(self, parent, id, pos, size, style)
self.configure_scintilla()
# Track if 'enter' key as ever been processed
# This variable will only be reallowed until key goes up
self.enter_catched = False
self.current_prompt_pos = 0
self.Bind(wx.EVT_KEY_DOWN, self._on_key_down)
self.Bind(wx.EVT_KEY_UP, self._on_key_up)
def write(self, text, refresh=True):
""" Write given text to buffer, while translating the ansi escape
sequences.
"""
# XXX: do not put print statements to sys.stdout/sys.stderr in
# this method, the print statements will call this method, as
# you will end up with an infinit loop
title = self.title_pat.split(text)
if len(title)>1:
self.title = title[-2]
text = self.title_pat.sub('', text)
segments = self.color_pat.split(text)
segment = segments.pop(0)
self.GotoPos(self.GetLength())
self.StartStyling(self.GetLength(), 0xFF)
try:
self.AppendText(segment)
except UnicodeDecodeError:
# XXX: Do I really want to skip the exception?
pass
if segments:
for ansi_tag, text in zip(segments[::2], segments[1::2]):
self.StartStyling(self.GetLength(), 0xFF)
try:
self.AppendText(text)
except UnicodeDecodeError:
# XXX: Do I really want to skip the exception?
pass
if ansi_tag not in self.ANSI_STYLES:
style = 0
else:
style = self.ANSI_STYLES[ansi_tag][0]
self.SetStyling(len(text), style)
self.GotoPos(self.GetLength())
if refresh:
current_time = time.time()
if current_time - self._last_refresh_time > 0.03:
if sys.platform == 'win32':
wx.SafeYield()
else:
wx.Yield()
# self.ProcessEvent(wx.PaintEvent())
self._last_refresh_time = current_time
def new_prompt(self, prompt):
""" Prints a prompt at start of line, and move the start of the
current block there.
The prompt can be given with ascii escape sequences.
"""
self.write(prompt, refresh=False)
# now we update our cursor giving end of prompt
self.current_prompt_pos = self.GetLength()
self.current_prompt_line = self.GetCurrentLine()
self.EnsureCaretVisible()
self.last_prompt = prompt
def continuation_prompt(self):
""" Returns the current continuation prompt.
We need to implement this method here to deal with the
ascii escape sequences cleaning up.
"""
# ASCII-less prompt
ascii_less = ''.join(self.color_pat.split(self.last_prompt)[2::2])
return "."*(len(ascii_less)-2) + ': '
def scroll_to_bottom(self):
maxrange = self.GetScrollRange(wx.VERTICAL)
self.ScrollLines(maxrange)
def pop_completion(self, possibilities, offset=0):
""" Pops up an autocompletion menu. Offset is the offset
in characters of the position at which the menu should
appear, relativ to the cursor.
"""
self.AutoCompSetIgnoreCase(False)
self.AutoCompSetAutoHide(False)
self.AutoCompSetMaxHeight(len(possibilities))
self.AutoCompShow(offset, " ".join(possibilities))
def get_line_width(self):
""" Return the width of the line in characters.
"""
return self.GetSize()[0]/self.GetCharWidth()
def configure_scintilla(self):
""" Set up all the styling option of the embedded scintilla
widget.
"""
p = self.style.copy()
# Marker for complete buffer.
self.MarkerDefine(_COMPLETE_BUFFER_MARKER, stc.STC_MARK_BACKGROUND,
background=p['trace'])
# Marker for current input buffer.
self.MarkerDefine(_INPUT_MARKER, stc.STC_MARK_BACKGROUND,
background=p['stdout'])
# Marker for tracebacks.
self.MarkerDefine(_ERROR_MARKER, stc.STC_MARK_BACKGROUND,
background=p['stderr'])
self.SetEOLMode(stc.STC_EOL_LF)
# Ctrl"+" or Ctrl "-" can be used to zoomin/zoomout the text inside
# the widget
self.CmdKeyAssign(ord('+'), stc.STC_SCMOD_CTRL, stc.STC_CMD_ZOOMIN)
self.CmdKeyAssign(ord('-'), stc.STC_SCMOD_CTRL, stc.STC_CMD_ZOOMOUT)
# Also allow Ctrl Shift "=" for poor non US keyboard users.
self.CmdKeyAssign(ord('='), stc.STC_SCMOD_CTRL|stc.STC_SCMOD_SHIFT,
stc.STC_CMD_ZOOMIN)
# Keys: we need to clear some of the keys the that don't play
# well with a console.
self.CmdKeyClear(ord('D'), stc.STC_SCMOD_CTRL)
self.CmdKeyClear(ord('L'), stc.STC_SCMOD_CTRL)
self.CmdKeyClear(ord('T'), stc.STC_SCMOD_CTRL)
self.CmdKeyClear(ord('A'), stc.STC_SCMOD_CTRL)
self.SetEOLMode(stc.STC_EOL_CRLF)
self.SetWrapMode(stc.STC_WRAP_CHAR)
self.SetWrapMode(stc.STC_WRAP_WORD)
self.SetBufferedDraw(True)
self.SetUseAntiAliasing(p['antialiasing'])
self.SetLayoutCache(stc.STC_CACHE_PAGE)
self.SetUndoCollection(False)
self.SetUseTabs(True)
self.SetIndent(4)
self.SetTabWidth(4)
# we don't want scintilla's autocompletion to choose
# automaticaly out of a single choice list, as we pop it up
# automaticaly
self.AutoCompSetChooseSingle(False)
self.AutoCompSetMaxHeight(10)
# XXX: this doesn't seem to have an effect.
self.AutoCompSetFillUps('\n')
self.SetMargins(3, 3) #text is moved away from border with 3px
# Suppressing Scintilla margins
self.SetMarginWidth(0, 0)
self.SetMarginWidth(1, 0)
self.SetMarginWidth(2, 0)
# Xterm escape sequences
self.color_pat = re.compile('\x01?\x1b\[(.*?)m\x02?')
self.title_pat = re.compile('\x1b]0;(.*?)\x07')
# styles
self.SetCaretForeground(p['carret_color'])
background_color = p['background_color']
if 'default' in p:
if 'back' not in p['default']:
p['default'] += ',back:%s' % background_color
if 'size' not in p['default']:
p['default'] += ',size:%s' % self.faces['size']
if 'face' not in p['default']:
p['default'] += ',face:%s' % self.faces['mono']
self.StyleSetSpec(stc.STC_STYLE_DEFAULT, p['default'])
else:
self.StyleSetSpec(stc.STC_STYLE_DEFAULT,
"fore:%s,back:%s,size:%d,face:%s"
% (self.ANSI_STYLES['0;30'][1],
background_color,
self.faces['size'], self.faces['mono']))
self.StyleClearAll()
# XXX: two lines below are usefull if not using the lexer
#for style in self.ANSI_STYLES.values():
# self.StyleSetSpec(style[0], "bold,fore:%s" % style[1])
# prompt definition
self.prompt_in1 = p['prompt_in1']
self.prompt_out = p['prompt_out']
self.output_prompt_template = string.Template(self.prompt_out)
self.input_prompt_template = string.Template(self.prompt_in1)
self.StyleSetSpec(_STDOUT_STYLE, p['stdout'])
self.StyleSetSpec(_STDERR_STYLE, p['stderr'])
self.StyleSetSpec(_TRACE_STYLE, p['trace'])
self.StyleSetSpec(stc.STC_STYLE_BRACELIGHT, p['bracegood'])
self.StyleSetSpec(stc.STC_STYLE_BRACEBAD, p['bracebad'])
self.StyleSetSpec(stc.STC_P_COMMENTLINE, p['comment'])
self.StyleSetSpec(stc.STC_P_NUMBER, p['number'])
self.StyleSetSpec(stc.STC_P_STRING, p['string'])
self.StyleSetSpec(stc.STC_P_CHARACTER, p['char'])
self.StyleSetSpec(stc.STC_P_WORD, p['keyword'])
self.StyleSetSpec(stc.STC_P_WORD2, p['keyword'])
self.StyleSetSpec(stc.STC_P_TRIPLE, p['triple'])
self.StyleSetSpec(stc.STC_P_TRIPLEDOUBLE, p['tripledouble'])
self.StyleSetSpec(stc.STC_P_CLASSNAME, p['class'])
self.StyleSetSpec(stc.STC_P_DEFNAME, p['def'])
self.StyleSetSpec(stc.STC_P_OPERATOR, p['operator'])
self.StyleSetSpec(stc.STC_P_COMMENTBLOCK, p['comment'])
edge_column = p['edge_column']
if edge_column is not None and edge_column > 0:
#we add a vertical line to console widget
self.SetEdgeMode(stc.STC_EDGE_LINE)
self.SetEdgeColumn(edge_column)
#--------------------------------------------------------------------------
# EditWindow API
#--------------------------------------------------------------------------
def OnUpdateUI(self, event):
""" Override the OnUpdateUI of the EditWindow class, to prevent
syntax highlighting both for faster redraw, and for more
consistent look and feel.
"""
#--------------------------------------------------------------------------
# Private API
#--------------------------------------------------------------------------
def _on_key_down(self, event, skip=True):
""" Key press callback used for correcting behavior for
console-like interfaces: the cursor is constraint to be after
the last prompt.
Return True if event as been catched.
"""
catched = True
# XXX: Would the right way to do this be to have a
# dictionary at the instance level associating keys with
# callbacks? How would we deal with inheritance? And Do the
# different callbacks share local variables?
# Intercept some specific keys.
key_code = event.GetKeyCode()
if key_code == ord('L') and event.ControlDown() :
self.scroll_to_bottom()
elif key_code == ord('K') and event.ControlDown() :
self.input_buffer = ''
elif key_code == ord('A') and event.ControlDown() :
self.GotoPos(self.GetLength())
self.SetSelectionStart(self.current_prompt_pos)
self.SetSelectionEnd(self.GetCurrentPos())
catched = True
elif key_code == ord('E') and event.ControlDown() :
self.GotoPos(self.GetLength())
catched = True
elif key_code == wx.WXK_PAGEUP:
self.ScrollPages(-1)
elif key_code == wx.WXK_PAGEDOWN:
self.ScrollPages(1)
elif key_code == wx.WXK_HOME:
self.GotoPos(self.GetLength())
elif key_code == wx.WXK_END:
self.GotoPos(self.GetLength())
elif key_code == wx.WXK_UP and event.ShiftDown():
self.ScrollLines(-1)
elif key_code == wx.WXK_DOWN and event.ShiftDown():
self.ScrollLines(1)
else:
catched = False
if self.AutoCompActive():
event.Skip()
else:
if key_code in (13, wx.WXK_NUMPAD_ENTER):
# XXX: not catching modifiers, to be wx2.6-compatible
catched = True
if not self.enter_catched:
self.CallTipCancel()
if event.ShiftDown():
# Try to force execution
self.GotoPos(self.GetLength())
self.write('\n' + self.continuation_prompt(),
refresh=False)
self._on_enter()
else:
self._on_enter()
self.enter_catched = True
elif key_code == wx.WXK_HOME:
if not event.ShiftDown():
self.GotoPos(self.current_prompt_pos)
catched = True
else:
# FIXME: This behavior is not ideal: if the selection
# is already started, it will jump.
self.SetSelectionStart(self.current_prompt_pos)
self.SetSelectionEnd(self.GetCurrentPos())
catched = True
elif key_code == wx.WXK_UP:
if self.GetCurrentLine() > self.current_prompt_line:
if self.GetCurrentLine() == self.current_prompt_line + 1 \
and self.GetColumn(self.GetCurrentPos()) < \
self.GetColumn(self.current_prompt_pos):
self.GotoPos(self.current_prompt_pos)
else:
event.Skip()
catched = True
elif key_code in (wx.WXK_LEFT, wx.WXK_BACK):
if not self._keep_cursor_in_buffer(self.GetCurrentPos() - 1):
event.Skip()
catched = True
elif key_code == wx.WXK_RIGHT:
if not self._keep_cursor_in_buffer(self.GetCurrentPos() + 1):
event.Skip()
catched = True
elif key_code == wx.WXK_DELETE:
if not self._keep_cursor_in_buffer(self.GetCurrentPos() - 1):
event.Skip()
catched = True
if skip and not catched:
# Put the cursor back in the edit region
if not self._keep_cursor_in_buffer():
if not (self.GetCurrentPos() == self.GetLength()
and key_code == wx.WXK_DELETE):
event.Skip()
catched = True
return catched
def _on_key_up(self, event, skip=True):
""" If cursor is outside the editing region, put it back.
"""
if skip:
event.Skip()
self._keep_cursor_in_buffer()
# XXX: I need to avoid the problem of having an empty glass;
def _keep_cursor_in_buffer(self, pos=None):
""" Checks if the cursor is where it is allowed to be. If not,
put it back.
Returns
-------
cursor_moved: Boolean
whether or not the cursor was moved by this routine.
Notes
------
WARNING: This does proper checks only for horizontal
movements.
"""
if pos is None:
current_pos = self.GetCurrentPos()
else:
current_pos = pos
if current_pos < self.current_prompt_pos:
self.GotoPos(self.current_prompt_pos)
return True
line_num = self.LineFromPosition(current_pos)
if not current_pos > self.GetLength():
line_pos = self.GetColumn(current_pos)
else:
line_pos = self.GetColumn(self.GetLength())
line = self.GetLine(line_num)
# Jump the continuation prompt
continuation_prompt = self.continuation_prompt()
if ( line.startswith(continuation_prompt)
and line_pos < len(continuation_prompt)):
if line_pos < 2:
# We are at the beginning of the line, trying to move
# forward: jump forward.
self.GotoPos(current_pos + 1 +
len(continuation_prompt) - line_pos)
else:
# Jump back up
self.GotoPos(self.GetLineEndPosition(line_num-1))
return True
elif ( current_pos > self.GetLineEndPosition(line_num)
and not current_pos == self.GetLength()):
# Jump to next line
self.GotoPos(current_pos + 1 +
len(continuation_prompt))
return True
# We re-allow enter event processing
self.enter_catched = False
return False
if __name__ == '__main__':
# Some simple code to test the console widget.
class MainWindow(wx.Frame):
def __init__(self, parent, id, title):
wx.Frame.__init__(self, parent, id, title, size=(300, 250))
self._sizer = wx.BoxSizer(wx.VERTICAL)
self.console_widget = ConsoleWidget(self)
self._sizer.Add(self.console_widget, 1, wx.EXPAND)
self.SetSizer(self._sizer)
self.SetAutoLayout(1)
self.Show(True)
app = wx.PySimpleApp()
w = MainWindow(None, wx.ID_ANY, 'ConsoleWidget')
w.SetSize((780, 460))
w.Show()
app.MainLoop()