def decodeTextValue()

in src/pycalendar/utils.py [0:0]

• 45 lines of code
• 20 McCabe index (conditional complexity)

def decodeTextValue(value):
    os = StringIO.StringIO()

    start_pos = 0
    end_pos = find_first_of(value, "\\", start_pos)
    size_pos = len(value)
    if end_pos != -1:
        while True:
            # Write current segment upto but not including the escape char
            os.write(value[start_pos:end_pos])

            # Bump to escapee char but not past the end
            end_pos += 1
            if end_pos >= size_pos:
                break

            # Unescape
            c = value[end_pos]
            if c == 'r':
                os.write('\r')
            elif c == 'n':
                os.write('\n')
            elif c == 'N':
                os.write('\n')
            elif c == '':
                os.write('')
            elif c == '\\':
                os.write('\\')
            elif c == ',':
                os.write(',')
            elif c == ';':
                os.write(';')
            elif c == ':':
                # ":" escape normally invalid
                if ParserContext.INVALID_COLON_ESCAPE_SEQUENCE == ParserContext.PARSER_RAISE:
                    raise ValueError("TextValue: '\\:' not allowed")
                elif ParserContext.INVALID_COLON_ESCAPE_SEQUENCE == ParserContext.PARSER_FIX:
                    os.write(':')

            # Other escaped chars normally not allowed
            elif ParserContext.INVALID_ESCAPE_SEQUENCES == ParserContext.PARSER_RAISE:
                raise ValueError("TextValue: '\\{}' not allowed".format(c))
            elif ParserContext.INVALID_ESCAPE_SEQUENCES == ParserContext.PARSER_FIX:
                os.write(c)

            # Bump past escapee and look for next segment (not past the end)
            start_pos = end_pos + 1
            if start_pos >= size_pos:
                break

            end_pos = find_first_of(value, "\\", start_pos)
            if end_pos == -1:
                os.write(value[start_pos:])
                break

    else:
        os.write(value)

    return os.getvalue()