diff options
Diffstat (limited to 'colorclass/search.py')
-rw-r--r-- | colorclass/search.py | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/colorclass/search.py b/colorclass/search.py new file mode 100644 index 0000000..555402d --- /dev/null +++ b/colorclass/search.py @@ -0,0 +1,49 @@ +"""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) |