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# Copyright (C) 2010 David Barnett <davidbarnett2@gmail.com>
# Copyright (C) 2010-2013 Roman Zimbelmann <hut@lavabit.com>
# This software is distributed under the terms of the GNU GPL version 3.
"""A library to help to convert ANSI codes to curses instructions."""
from ranger.gui import color
import re
ansi_re = re.compile('(\x1b' + r'\[\d*(?:;\d+)*?[a-zA-Z])')
codesplit_re = re.compile('38;5;(\d+);|48;5;(\d+);|(\d*);')
reset = '\x1b[0m'
def split_ansi_from_text(ansi_text):
return ansi_re.split(ansi_text)
# For information on the ANSI codes see
# githttp://en.wikipedia.org/wiki/ANSI_escape_code
def text_with_fg_bg_attr(ansi_text):
fg, bg, attr = -1, -1, 0
for chunk in split_ansi_from_text(ansi_text):
if chunk and chunk[0] == '\x1b':
if chunk[-1] != 'm':
continue
match = re.match(r'^.\[(.*).$', chunk)
if not match:
# XXX I have no test case to determine what should happen here
continue
attr_args = match.group(1)
# Convert arguments to attributes/colors
for x256fg, x256bg, arg in codesplit_re.findall(attr_args + ';'):
# first handle xterm256 codes
try:
if len(x256fg) > 0: # xterm256 foreground
fg = int(x256fg)
continue
elif len(x256bg) > 0: # xterm256 background
bg = int(x256bg)
continue
elif len(arg) > 0: # usual ansi code
n = int(arg)
else: # empty code means reset
n = 0
except:
continue
if n == 0: # reset colors and attributes
fg, bg, attr = -1, -1, 0
elif n == 1: # enable attribute
attr |= color.bold
elif n == 4:
attr |= color.underline
elif n == 5:
attr |= color.blink
elif n == 7:
attr |= color.reverse
elif n == 8:
attr |= color.invisible
elif n == 22: # disable attribute
attr &= not color.bold
elif n == 24:
attr &= not color.underline
elif n == 25:
attr &= not color.blink
elif n == 27:
attr &= not color.reverse
elif n == 28:
attr &= not color.invisible
elif n >= 30 and n <= 37: # 8 ansi foreground and background colors
fg = n - 30
elif n == 39:
fg = -1
elif n >= 40 and n <= 47:
bg = n - 40
elif n == 49:
bg = -1
elif n >= 90 and n <= 97: # 8 aixterm high intensity colors (light but not bold)
fg = n - 90 + 8
elif n == 99:
fg = -1
elif n >= 100 and n <= 107:
bg = n - 100 + 8
elif n == 109:
bg = -1
yield (fg, bg, attr)
else:
yield chunk
def char_len(ansi_text):
"""Count the number of visible characters.
>>> char_len("\x1b[0;30;40mX\x1b[0m")
1
>>> char_len("\x1b[0;30;40mXY\x1b[0m")
2
>>> char_len("\x1b[0;30;40mX\x1b[0mY")
2
>>> char_len("hello")
5
>>> char_len("")
0
"""
return len(ansi_re.sub('', ansi_text))
def char_slice(ansi_text, start, length):
"""Slices a string with respect to ansi code sequences
Acts as if the ansi codes aren't there, slices the text from the
given start point to the given length and adds the codes back in.
>>> test_string = "abcde\x1b[30mfoo\x1b[31mbar\x1b[0mnormal"
>>> split_ansi_from_text(test_string)
['abcde', '\\x1b[30m', 'foo', '\\x1b[31m', 'bar', '\\x1b[0m', 'normal']
>>> char_slice(test_string, 1, 3)
'bcd'
>>> char_slice(test_string, 5, 6)
'\\x1b[30mfoo\\x1b[31mbar'
>>> char_slice(test_string, 0, 8)
'abcde\\x1b[30mfoo'
>>> char_slice(test_string, 4, 4)
'e\\x1b[30mfoo'
>>> char_slice(test_string, 11, 100)
'\\x1b[0mnormal'
>>> char_slice(test_string, 9, 100)
'\\x1b[31mar\\x1b[0mnormal'
>>> char_slice(test_string, 9, 4)
'\\x1b[31mar\\x1b[0mno'
"""
chunks = []
last_color = ""
pos = old_pos = 0
for i, chunk in enumerate(split_ansi_from_text(ansi_text)):
if i % 2 == 1:
last_color = chunk
continue
old_pos = pos
pos += len(chunk)
if pos <= start:
pass # seek
elif old_pos < start and pos >= start:
chunks.append(last_color)
chunks.append(chunk[start-old_pos:start-old_pos+length])
elif pos > length + start:
chunks.append(last_color)
chunks.append(chunk[:start-old_pos+length])
else:
chunks.append(last_color)
chunks.append(chunk)
if pos - start >= length:
break
return ''.join(chunks)
if __name__ == '__main__':
import doctest
doctest.testmod()
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