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"""Determine color of characters that may or may not be adjacent to ANSI escape sequences."""
from colorclass.parse import RE_SPLIT
def build_color_index(ansi_string):
"""Build an index between visible characters and a string with invisible color codes.
:param str ansi_string: String with color codes (ANSI escape sequences).
:return: Position of visible characters in color string (indexes match non-color string).
:rtype: tuple
"""
mapping = list()
color_offset = 0
for item in (i for i in RE_SPLIT.split(ansi_string) if i):
if RE_SPLIT.match(item):
color_offset += len(item)
else:
for _ in range(len(item)):
mapping.append(color_offset)
color_offset += 1
return tuple(mapping)
def find_char_color(ansi_string, pos):
"""Determine what color a character is in the string.
:param str ansi_string: String with color codes (ANSI escape sequences).
:param int pos: Position of the character in the ansi_string.
:return: Character along with all surrounding color codes.
:rtype: str
"""
result = list()
position = 0 # Set to None when character is found.
for item in (i for i in RE_SPLIT.split(ansi_string) if i):
if RE_SPLIT.match(item):
result.append(item)
if position is not None:
position += len(item)
elif position is not None:
for char in item:
if position == pos:
result.append(char)
position = None
break
position += 1
return ''.join(result)
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