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# Copyright (C) 2010 David Barnett <davidbarnett2@gmail.com>
# Copyright (C) 2010, 2011 Roman Zimbelmann <romanz@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])')
reset = '\x1b[0m'
def split_ansi_from_text(ansi_text):
return ansi_re.split(ansi_text)
def text_with_fg_bg_attr(ansi_text):
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)
fg, bg, attr = -1, -1, 0
# Convert arguments to attributes/colors
for arg in attr_args.split(';'):
try:
n = int(arg)
except:
if arg == '':
n = 0
else:
continue
if n == 0:
fg, bg, attr = -1, -1, 0
elif n == 1:
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 >= 30 and n <= 37:
fg = n - 30
elif n == 39:
fg = -1
elif n >= 40 and n <= 47:
bg = n - 40
elif n == 49:
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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