Function GetLineWidth

tools/cpplint.py:5529–5557

Determines the width of the line in column positions. Args: line: A string, which may be a Unicode string. Returns: The width of the line in column positions, accounting for Unicode combining characters and wide characters.

(line)

def GetLineWidth(line):
    """Determines the width of the line in column positions.

    Args:
      line: A string, which may be a Unicode string.

    Returns:
      The width of the line in column positions, accounting for Unicode
      combining characters and wide characters.
    """
    if isinstance(line, str):
        width = 0
        for uc in unicodedata.normalize("NFC", line):
            if unicodedata.east_asian_width(uc) in ("W", "F"):
                width += 2
            elif not unicodedata.combining(uc):
                # Issue 337
                # https://mail.python.org/pipermail/python-list/2012-August/628809.html
                if (sys.version_info.major, sys.version_info.minor) <= (3, 2):
                    # https://github.com/python/cpython/blob/2.7/Include/unicodeobject.h#L81
                    is_wide_build = sysconfig.get_config_var("Py_UNICODE_SIZE") >= 4
                    # https://github.com/python/cpython/blob/2.7/Objects/unicodeobject.c#L564
                    is_low_surrogate = 0xDC00 <= ord(uc) <= 0xDFFF
                    if not is_wide_build and is_low_surrogate:
                        width -= 1

                width += 1
        return width
    return len(line)


def CheckStyle(filename, clean_lines, linenum, file_extension, nesting_state, error, cppvar=None):