def textwidth(text):
     if isinstance(text, unicode):
         length = wcwidth.wcswidth(text)
         return len(text) if length == -1 else length
     else:
         text = text.decode("utf-8", "replace")
         length = wcwidth.wcswidth(text)
         return len(text) if length == -1 else length

def _visible_width(s):
    """Visible width of a printed string. ANSI color codes are removed.

    >>> _visible_width('\x1b[31mhello\x1b[0m'), _visible_width("world")
    (5, 5)

    """
    if isinstance(s, _text_type) or isinstance(s, _binary_type):
        return wcswidth(_strip_invisible(s))
    else:
        return wcswidth(_text_type(s))

 def force_text(self, text, prompt=False):
     if isinstance(text, str):
         text = text.decode('utf-8')
     if prompt:
         text_length = wcswidth(text + self.page_index)
         ret = text + (self.width - text_length) * u' ' + self.page_index
     else:
         text_length = wcswidth(text)
         ret = text + (self.width - text_length) * u' '
     # XXX stdout = unicode -> ansii NG(maybe ansii encode fail)
     # XXX stdout = unicode -> str OK
     return ret.encode('utf-8')

def _get_line_with_reprcrash_message(config, rep, termwidth):
    """Get summary line for a report, trying to add reprcrash message."""
    from wcwidth import wcswidth

    verbose_word = rep._get_verbose_word(config)
    pos = _get_pos(config, rep)

    line = "%s %s" % (verbose_word, pos)
    len_line = wcswidth(line)
    ellipsis, len_ellipsis = "...", 3
    if len_line > termwidth - len_ellipsis:
        # No space for an additional message.
        return line

    try:
        msg = rep.longrepr.reprcrash.message
    except AttributeError:
        pass
    else:
        # Only use the first line.
        i = msg.find("\n")
        if i != -1:
            msg = msg[:i]
        len_msg = wcswidth(msg)

        sep, len_sep = " - ", 3
        max_len_msg = termwidth - len_line - len_sep
        if max_len_msg >= len_ellipsis:
            if len_msg > max_len_msg:
                max_len_msg -= len_ellipsis
                msg = msg[:max_len_msg]
                while wcswidth(msg) > max_len_msg:
                    msg = msg[:-1]
                if six.PY2:
                    # on python 2 systems with narrow unicode compilation, trying to
                    # get a single character out of a multi-byte unicode character such as
                    # u'😄' will result in a High Surrogate (U+D83D) character, which is
                    # rendered as u'�'; in this case we just strip that character out as it
                    # serves no purpose being rendered
                    try:
                        surrogate = six.unichr(0xD83D)
                        msg = msg.rstrip(surrogate)
                    except ValueError:  # pragma: no cover
                        # Jython cannot represent this lone surrogate at all (#5256):
                        # ValueError: unichr() arg is a lone surrogate in range
                        #     (0xD800, 0xDFFF) (Jython UTF-16 encoding)
                        # ignore this case as it shouldn't appear in the string anyway
                        pass
                msg += ellipsis
            line += sep + msg
    return line

    def erase(self, string, keypress=chr(127)):
        """ .. method:: erase(string, keypress=chr(127)) -> string

            Returns sequence for erasing ``string`` preceeding cursor given
            the erase character ``keypressed`` (one of chr(127) or 8) has
            been used to perform deletion, assisting predicted cursor
            movement of sessions using remote line editing with echo off.
        """
        assert keypress in (chr(127), chr(8)), chr
        string_disp = "".join(
            (
                (_char if self.stream.can_write(_char) and _char.isprintable() else name_unicode(_char))
                for _char in string
            )
        )
        vtlen = wcwidth.wcswidth(string_disp)
        assert vtlen >= 0, string

        # non-BSD clients will echo
        if self.stream.will_echo:
            return ("\b" * vtlen) + "\x1b[K"

        # BSD has strange behavior for line editing with local echo:
        if keypress == chr(127):
            # (1) '^?' actually advances the cursor right one cell,
            return "\b" + ("\b" * vtlen) + "\x1b[K"
        else:
            # (2) whereas '^h' moves the cursor left one (displayable) cell !
            return "\b" * (vtlen - 1) + "\x1b[K"

    def format_field(self, value, format_spec):
        if not isinstance(value, str):
            # If `value` is not a string use format built-in
            return format(value, format_spec)
        if format_spec == '':
            # If `format_spec` is empty we just return the `value` string
            return value

        print_length = wcwidth.wcswidth(value)
        if len(value) == print_length:
            return format(value, format_spec)

        fill, align, width, format_spec = UnicodeFormatter.parse_align(format_spec)
        if width == 0:
            return value
        formatted_value = format(value, format_spec)
        pad_len = width - print_length
        if pad_len <= 0:
            return formatted_value
        left_pad = ''
        right_pad = ''
        if align in '<=':
            right_pad = fill * pad_len
        elif align == '>':
            left_pad = fill * pad_len
        elif align == '^':
            left_pad = fill * math.floor(pad_len/2)
            right_pad = fill * math.ceil(pad_len/2)
        return ''.join((left_pad, formatted_value, right_pad))

def monospaced_width(text):
    r"""
    Return the number of character cells that this string is likely to occupy
    when displayed in a monospaced, modern, Unicode-aware terminal emulator.
    We refer to this as the "display width" of the string.

    This can be useful for formatting text that may contain non-spacing
    characters, or CJK characters that take up two character cells.

    Returns -1 if the string contains a non-printable or control character.

    >>> monospaced_width('ちゃぶ台返し')
    12
    >>> len('ちゃぶ台返し')
    6
    >>> monospaced_width('owl\N{SOFT HYPHEN}flavored')
    12
    >>> monospaced_width('example\x80')
    -1

    A more complex example: The Korean word 'ibnida' can be written with 3
    pre-composed characters or 7 jamo. Either way, it *looks* the same and
    takes up 6 character cells.

    >>> monospaced_width('입니다')
    6
    >>> monospaced_width('\u110b\u1175\u11b8\u1102\u1175\u1103\u1161')
    6
    """
    # NFC-normalize the text first, so that we don't need special cases for
    # Hangul jamo.
    return wcswidth(normalize('NFC', text))

    def __str__(self):
        answer = ""
        skip_next = False
        for i, line in enumerate(self.field):
            for j, c in enumerate(line):
                fg_ansi = ""
                bg_ansi = ""
                stop = ""

                if self.field[i][j].foreground:
                    fg_ansi = '\033[38;2;%s;%s;%sm' % rgb_from_str(self.field[i][j].foreground)
                    stop = colored.attr("reset")

                if self.field[i][j].background:
                    bg_ansi = '\033[48;2;%s;%s;%sm' % rgb_from_str(self.field[i][j].background)
                    stop = colored.attr("reset")

                char = c.char or " "
                if not skip_next:
                    answer += fg_ansi + bg_ansi + char.encode('utf-8') + stop
                skip_next = wcswidth(char) == 2

            # answer += "...\n"
            answer += "\n"
        return answer

def _padleft(width, s, has_invisible=True):
    """Flush right.

    >>> _padleft(6, '\u044f\u0439\u0446\u0430') == '  \u044f\u0439\u0446\u0430'
    True

    """
    lwidth = width - wcswidth(_strip_invisible(s) if has_invisible else s)
    return ' ' * lwidth + s

def _padright(width, s, has_invisible=True):
    """Flush left.

    >>> _padright(6, '\u044f\u0439\u0446\u0430') == '\u044f\u0439\u0446\u0430  '
    True

    """
    rwidth = width - wcswidth(_strip_invisible(s) if has_invisible else s)
    return s + ' ' * rwidth

def format_value_text(val, encoding, colormap, quote=False, **_):
    escapedval = val.replace(u'\\', u'\\\\')
    if quote:
        escapedval = escapedval.replace("'", "''")
    escapedval = unicode_controlchars_re.sub(_show_control_chars, escapedval)
    bval = escapedval.encode(encoding, 'backslashreplace')
    if quote:
        bval = "'%s'" % bval

    return bval if colormap is NO_COLOR_MAP else color_text(bval, colormap, wcwidth.wcswidth(bval.decode(encoding)))

def width_aware_slice(s, start, end, replacement_char=u' '):
    divides = [wcwidth.wcswidth(s, i) for i in range(len(s)+1)]

    new_chunk_chars = []
    for char, char_start, char_end in zip(s, divides[:-1], divides[1:]):
        if char_start >= start and char_end <= end:
            new_chunk_chars.append(char)
        else:
            new_chunk_chars.extend(replacement_char * interval_overlap(char_start, char_end, start, end))

    return ''.join(new_chunk_chars)

def _padboth(width, s, has_invisible=True):
    """Center string.

    >>> _padboth(6, '\u044f\u0439\u0446\u0430') == ' \u044f\u0439\u0446\u0430 '
    True

    """
    xwidth = width - wcswidth(_strip_invisible(s) if has_invisible else s)
    lwidth = xwidth // 2
    rwidth =  0 if xwidth <= 0 else lwidth + xwidth % 2
    return ' ' * lwidth + s + ' ' * rwidth

def test_combining_enclosing():
    u"""CYRILLIC CAPITAL LETTER A + COMBINING CYRILLIC HUNDRED THOUSANDS SIGN is А҈ of length 1."""
    phrase = u"\u0410\u0488"
    expect_length_each = (1, 0)
    expect_length_phrase = 1

    # exercise,
    length_each = tuple(map(wcwidth.wcwidth, phrase))
    length_phrase = wcwidth.wcswidth(phrase, len(phrase))

    # verify,
    assert length_each == expect_length_each
    assert length_phrase == expect_length_phrase

def test_combining_cafe():
    u"""Phrase cafe + COMBINING ACUTE ACCENT is café of length 4."""
    phrase = u"cafe\u0301"
    expect_length_each = (1, 1, 1, 1, 0)
    expect_length_phrase = 4

    # exercise,
    length_each = tuple(map(wcwidth.wcwidth, phrase))
    length_phrase = wcwidth.wcswidth(phrase, len(phrase))

    # verify,
    assert length_each == expect_length_each
    assert length_phrase == expect_length_phrase

def test_combining_spacing():
    u"""Balinese kapal (ship) is ᬓᬨᬮ᭄ of length 4."""
    phrase = u"\u1B13\u1B28\u1B2E\u1B44"
    expect_length_each = (1, 1, 1, 1)
    expect_length_phrase = 4

    # exercise,
    length_each = tuple(map(wcwidth.wcwidth, phrase))
    length_phrase = wcwidth.wcswidth(phrase, len(phrase))

    # verify,
    assert length_each == expect_length_each
    assert length_phrase == expect_length_phrase

    def show_top_status(self):
        """Show top status row."""
        self.header_win.erase()
        size = self.get_size()
        display = self.app.config["display"]
        head_parts = []
        if display["show_app_name"]:
            name_str = "Suplemon Editor v{0} -".format(self.app.version)
            if self.app.config["app"]["use_unicode_symbols"]:
                logo = "\U0001f34b"  # Fancy lemon
                name_str = " {0} {1}".format(logo, name_str)
            head_parts.append(name_str)

        # Add module statuses to the status bar in descending order
        module_keys = sorted(self.app.modules.modules.keys())
        for name in module_keys:
            module = self.app.modules.modules[name]
            if module.options["status"] == "top":
                status = module.get_status()
                if status:
                    head_parts.append(status)

        if display["show_file_list"]:
            head_parts.append(self.file_list_str())

        head = " ".join(head_parts)
        head = head + (" " * (size[0]-wcswidth(head)-1))
        head_width = wcswidth(head)
        if head_width > size[0]:
            head = head[:size[0]-head_width]
        try:
            if self.app.config["display"]["invert_status_bars"]:
                self.header_win.addstr(0, 0, head, curses.color_pair(0) | curses.A_REVERSE)
            else:
                self.header_win.addstr(0, 0, head, curses.color_pair(0))
        except curses.error:
            pass
        self.header_win.refresh()

def test_null_width_0():
    """NULL (0) reports width 0."""
    # given,
    phrase = u'abc\x00def'
    expect_length_each = (1, 1, 1, 0, 1, 1, 1)
    expect_length_phrase = sum(expect_length_each)

    # exercise,
    length_each = tuple(map(wcwidth.wcwidth, phrase))
    length_phrase = wcwidth.wcswidth(phrase, len(phrase))

    # verify,
    assert length_each == expect_length_each
    assert length_phrase == expect_length_phrase

def test_control_c0_width_negative_1():
    """CSI (Control sequence initiate) reports width -1."""
    # given,
    phrase = u'\x1b[0m'
    expect_length_each = (-1, 1, 1, 1)
    expect_length_phrase = -1

    # exercise,
    length_each = tuple(map(wcwidth.wcwidth, phrase))
    length_phrase = wcwidth.wcswidth(phrase, len(phrase))

    # verify,
    assert length_each == expect_length_each
    assert length_phrase == expect_length_phrase

def test_combining_width_negative_1():
    """Simple test combining reports total width of 4."""
    # given,
    phrase = u'--\u05bf--'
    expect_length_each = (1, 1, 0, 1, 1)
    expect_length_phrase = 4

    # exercise,
    length_each = tuple(map(wcwidth.wcwidth, phrase))
    length_phrase = wcwidth.wcswidth(phrase, len(phrase))

    # verify,
    assert length_each == expect_length_each
    assert length_phrase == expect_length_phrase