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OpenChronos/tools/urwid/escape.py

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#!/usr/bin/python
# -*- coding: utf-8 -*-
#
# Urwid escape sequences common to curses_display and raw_display
# Copyright (C) 2004-2006 Ian Ward
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
# Urwid web site: http://excess.org/urwid/
"""
Terminal Escape Sequences for input and display
"""
import util
import os
import re
import encodings
utf8decode = lambda s: encodings.codecs.utf_8_decode(s)[0]
SO = "\x0e"
SI = "\x0f"
DEC_TAG = "0"
DEC_SPECIAL_CHARS = utf8decode("◆▒°±┘┐┌└┼⎺⎻─⎼⎽├┤┴┬│≤≥π≠£·")
ALT_DEC_SPECIAL_CHARS = u"`afgjklmnopqrstuvwxyz{|}~"
DEC_SPECIAL_CHARMAP = {}
assert len(DEC_SPECIAL_CHARS) == len(ALT_DEC_SPECIAL_CHARS), `DEC_SPECIAL_CHARS, ALT_DEC_SPECIAL_CHARS`
for c, alt in zip(DEC_SPECIAL_CHARS, ALT_DEC_SPECIAL_CHARS):
DEC_SPECIAL_CHARMAP[ord(c)] = SO + alt + SI
SAFE_ASCII_DEC_SPECIAL_RE = re.compile(u"^[ -~%s]*$" % DEC_SPECIAL_CHARS)
DEC_SPECIAL_RE = re.compile(u"[%s]" % DEC_SPECIAL_CHARS)
###################
## Input sequences
###################
class MoreInputRequired(Exception):
pass
def escape_modifier( digit ):
mode = ord(digit) - ord("1")
return "shift "*(mode&1) + "meta "*((mode&2)/2) + "ctrl "*((mode&4)/4)
input_sequences = [
('[A','up'),('[B','down'),('[C','right'),('[D','left'),
('[E','5'),('[F','end'),('[G','5'),('[H','home'),
('[1~','home'),('[2~','insert'),('[3~','delete'),('[4~','end'),
('[5~','page up'),('[6~','page down'),
('[7~','home'),('[8~','end'),
('[[A','f1'),('[[B','f2'),('[[C','f3'),('[[D','f4'),('[[E','f5'),
('[11~','f1'),('[12~','f2'),('[13~','f3'),('[14~','f4'),
('[15~','f5'),('[17~','f6'),('[18~','f7'),('[19~','f8'),
('[20~','f9'),('[21~','f10'),('[23~','f11'),('[24~','f12'),
('[25~','f13'),('[26~','f14'),('[28~','f15'),('[29~','f16'),
('[31~','f17'),('[32~','f18'),('[33~','f19'),('[34~','f20'),
('OA','up'),('OB','down'),('OC','right'),('OD','left'),
('OH','home'),('OF','end'),
('OP','f1'),('OQ','f2'),('OR','f3'),('OS','f4'),
('Oo','/'),('Oj','*'),('Om','-'),('Ok','+'),
('[Z','shift tab'),
] + [
# modified cursor keys + home, end, 5 -- [#X and [1;#X forms
(prefix+digit+letter, escape_modifier(digit) + key)
for prefix in "[","[1;"
for digit in "12345678"
for letter,key in zip("ABCDEFGH",
('up','down','right','left','5','end','5','home'))
] + [
# modified F1-F4 keys -- O#X form
("O"+digit+letter, escape_modifier(digit) + key)
for digit in "12345678"
for letter,key in zip("PQRS",('f1','f2','f3','f4'))
] + [
# modified F1-F13 keys -- [XX;#~ form
("["+str(num)+";"+digit+"~", escape_modifier(digit) + key)
for digit in "12345678"
for num,key in zip(
(11,12,13,14,15,17,18,19,20,21,23,24,25,26,28,29,31,32,33,34),
('f1','f2','f3','f4','f5','f6','f7','f8','f9','f10','f11',
'f12','f13','f14','f15','f16','f17','f18','f19','f20'))
] + [
# mouse reporting (special handling done in KeyqueueTrie)
('[M', 'mouse'),
# report status response
('[0n', 'status ok')
]
class KeyqueueTrie(object):
def __init__( self, sequences ):
self.data = {}
for s, result in sequences:
assert type(result) != type({})
self.add(self.data, s, result)
def add(self, root, s, result):
assert type(root) == type({}), "trie conflict detected"
assert len(s) > 0, "trie conflict detected"
if root.has_key(ord(s[0])):
return self.add(root[ord(s[0])], s[1:], result)
if len(s)>1:
d = {}
root[ord(s[0])] = d
return self.add(d, s[1:], result)
root[ord(s)] = result
def get(self, keys, more_available):
result = self.get_recurse(self.data, keys, more_available)
if not result:
result = self.read_cursor_position(keys, more_available)
return result
def get_recurse(self, root, keys, more_available):
if type(root) != type({}):
if root == "mouse":
return self.read_mouse_info(keys,
more_available)
return (root, keys)
if not keys:
# get more keys
if more_available:
raise MoreInputRequired()
return None
if not root.has_key(keys[0]):
return None
return self.get_recurse(root[keys[0]], keys[1:], more_available)
def read_mouse_info(self, keys, more_available):
if len(keys) < 3:
if more_available:
raise MoreInputRequired()
return None
b = keys[0] - 32
x, y = keys[1] - 33, keys[2] - 33 # start from 0
prefix = ""
if b & 4: prefix = prefix + "shift "
if b & 8: prefix = prefix + "meta "
if b & 16: prefix = prefix + "ctrl "
# 0->1, 1->2, 2->3, 64->4, 65->5
button = ((b&64)/64*3) + (b & 3) + 1
if b & 3 == 3:
action = "release"
button = 0
elif b & MOUSE_RELEASE_FLAG:
action = "release"
elif b & MOUSE_DRAG_FLAG:
action = "drag"
else:
action = "press"
return ( (prefix + "mouse " + action, button, x, y), keys[3:] )
def read_cursor_position(self, keys, more_available):
"""
Interpret cursor position information being sent by the
user's terminal. Returned as ('cursor position', x, y)
where (x, y) == (0, 0) is the top left of the screen.
"""
if not keys:
if more_available:
raise MoreInputRequired()
return None
if keys[0] != ord('['):
return None
# read y value
y = 0
i = 1
for k in keys[i:]:
i += 1
if k == ord(';'):
if not y:
return None
break
if k < ord('0') or k > ord('9'):
return None
if not y and k == ord('0'):
return None
y = y * 10 + k - ord('0')
if not keys[i:]:
if more_available:
raise MoreInputRequired()
return None
# read x value
x = 0
for k in keys[i:]:
i += 1
if k == ord('R'):
if not x:
return None
return (("cursor position", x-1, y-1), keys[i:])
if k < ord('0') or k > ord('9'):
return None
if not x and k == ord('0'):
return None
x = x * 10 + k - ord('0')
if not keys[i:]:
if more_available:
raise MoreInputRequired()
return None
# This is added to button value to signal mouse release by curses_display
# and raw_display when we know which button was released. NON-STANDARD
MOUSE_RELEASE_FLAG = 2048
# xterm adds this to the button value to signal a mouse drag event
MOUSE_DRAG_FLAG = 32
#################################################
# Build the input trie from input_sequences list
input_trie = KeyqueueTrie(input_sequences)
#################################################
_keyconv = {
-1:None,
8:'backspace',
9:'tab',
10:'enter',
13:'enter',
127:'backspace',
# curses-only keycodes follow.. (XXX: are these used anymore?)
258:'down',
259:'up',
260:'left',
261:'right',
262:'home',
263:'backspace',
265:'f1', 266:'f2', 267:'f3', 268:'f4',
269:'f5', 270:'f6', 271:'f7', 272:'f8',
273:'f9', 274:'f10', 275:'f11', 276:'f12',
277:'shift f1', 278:'shift f2', 279:'shift f3', 280:'shift f4',
281:'shift f5', 282:'shift f6', 283:'shift f7', 284:'shift f8',
285:'shift f9', 286:'shift f10', 287:'shift f11', 288:'shift f12',
330:'delete',
331:'insert',
338:'page down',
339:'page up',
343:'enter', # on numpad
350:'5', # on numpad
360:'end',
}
def process_keyqueue(codes, more_available):
"""
codes -- list of key codes
more_available -- if True then raise MoreInputRequired when in the
middle of a character sequence (escape/utf8/wide) and caller
will attempt to send more key codes on the next call.
returns (list of input, list of remaining key codes).
"""
code = codes[0]
if code >= 32 and code <= 126:
key = chr(code)
return [key], codes[1:]
if _keyconv.has_key(code):
return [_keyconv[code]], codes[1:]
if code >0 and code <27:
return ["ctrl %s" % chr(ord('a')+code-1)], codes[1:]
if code >27 and code <32:
return ["ctrl %s" % chr(ord('A')+code-1)], codes[1:]
em = util.get_encoding_mode()
if (em == 'wide' and code < 256 and
util.within_double_byte(chr(code),0,0)):
if not codes[1:]:
if more_available:
raise MoreInputRequired()
if codes[1:] and codes[1] < 256:
db = chr(code)+chr(codes[1])
if util.within_double_byte(db, 0, 1):
return [db], codes[2:]
if em == 'utf8' and code>127 and code<256:
if code & 0xe0 == 0xc0: # 2-byte form
need_more = 1
elif code & 0xf0 == 0xe0: # 3-byte form
need_more = 2
elif code & 0xf8 == 0xf0: # 4-byte form
need_more = 3
else:
return ["<%d>"%code], codes[1:]
for i in range(need_more):
if len(codes)-1 <= i:
if more_available:
raise MoreInputRequired()
else:
return ["<%d>"%code], codes[1:]
k = codes[i+1]
if k>256 or k&0xc0 != 0x80:
return ["<%d>"%code], codes[1:]
s = "".join([chr(c)for c in codes[:need_more+1]])
try:
return [s.decode("utf-8")], codes[need_more+1:]
except UnicodeDecodeError:
return ["<%d>"%code], codes[1:]
if code >127 and code <256:
key = chr(code)
return [key], codes[1:]
if code != 27:
return ["<%d>"%code], codes[1:]
result = input_trie.get(codes[1:], more_available)
if result is not None:
result, remaining_codes = result
return [result], remaining_codes
if codes[1:]:
# Meta keys -- ESC+Key form
run, remaining_codes = process_keyqueue(codes[1:],
more_available)
if run[0] == "esc" or run[0].find("meta ") >= 0:
return ['esc']+run, remaining_codes
return ['meta '+run[0]]+run[1:], remaining_codes
return ['esc'], codes[1:]
####################
## Output sequences
####################
ESC = "\x1b"
CURSOR_HOME = ESC+"[H"
CURSOR_HOME_COL = "\r"
APP_KEYPAD_MODE = ESC+"="
NUM_KEYPAD_MODE = ESC+">"
SWITCH_TO_ALTERNATE_BUFFER = ESC+"7"+ESC+"[?47h"
RESTORE_NORMAL_BUFFER = ESC+"[?47l"+ESC+"8"
#RESET_SCROLL_REGION = ESC+"[;r"
#RESET = ESC+"c"
REPORT_STATUS = ESC + "[5n"
REPORT_CURSOR_POSITION = ESC+"[6n"
INSERT_ON = ESC + "[4h"
INSERT_OFF = ESC + "[4l"
def set_cursor_position( x, y ):
assert type(x) == type(0)
assert type(y) == type(0)
return ESC+"[%d;%dH" %(y+1, x+1)
def move_cursor_right(x):
if x < 1: return ""
return ESC+"[%dC" % x
def move_cursor_up(x):
if x < 1: return ""
return ESC+"[%dA" % x
def move_cursor_down(x):
if x < 1: return ""
return ESC+"[%dB" % x
HIDE_CURSOR = ESC+"[?25l"
SHOW_CURSOR = ESC+"[?25h"
MOUSE_TRACKING_ON = ESC+"[?1000h"+ESC+"[?1002h"
MOUSE_TRACKING_OFF = ESC+"[?1002l"+ESC+"[?1000l"
DESIGNATE_G1_SPECIAL = ESC+")0"
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