Method: Unicode.width

Defined in:
ext/unicode/unicode.c

.width(*args) ⇒ Object

wstr will be freed in get_text_elements_ensure()



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# File 'ext/unicode/unicode.c', line 1065

VALUE
unicode_wcswidth(int argc, VALUE* argv, VALUE obj)
{
  WString wstr;
  int i, count;
  int width = 0;
  int cjk_p = 0;
  VALUE str;
  VALUE cjk;

  count = rb_scan_args(argc, argv, "11", &str, &cjk);
  if (count > 1)
    cjk_p = RTEST(cjk);
  Check_Type(str, T_STRING);
#ifdef HAVE_RUBY_ENCODING_H
  CONVERT_TO_UTF8(str);
#endif
  WStr_allocWithUTF8L(&wstr, RSTRING_PTR(str), RSTRING_LEN(str));
  for (i = 0; i <wstr.len; i++) {
    int c = wstr.str[i];
    int cat = get_gencat(c);
    int eaw = get_eawidth(c);
    if ((c > 0 && c < 32) || (c >= 0x7f && c < 0xa0)) {
      /* Control Characters */
      width = -1;
      break;
    }
    else if (c != 0x00ad && /* SOFT HYPHEN */
             (cat == c_Mn || cat == c_Me || /* Non-spacing Marks */
              cat == c_Cf || /* Format */
              c == 0 || /* NUL */
              (c >= 0x1160 && c <= 0x11ff))) /* HANGUL JUNGSEONG/JONGSEONG */
      /* zero width */ ;
    else if (eaw == w_F || eaw == w_W || /* Fullwidth or Wide */
             (c >= 0x4db6 && c <= 0x4dbf) || /* CJK Reserved */
             (c >= 0x9fcd && c <= 0x9fff) || /* CJK Reserved */
             (c >= 0xfa6e && c <= 0xfa6f) || /* CJK Reserved */
             (c >= 0xfada && c <= 0xfaff) || /* CJK Reserved */
             (c >= 0x2a6d7 && c <= 0x2a6ff) || /* CJK Reserved */
             (c >= 0x2b735 && c <= 0x2b73f) || /* CJK Reserved */
             (c >= 0x2b81e && c <= 0x2f7ff) || /* CJK Reserved */
             (c >= 0x2fa1e && c <= 0x2fffd) || /* CJK Reserved */
             (c >= 0x30000 && c <= 0x3fffd) || /* CJK Reserved */
             (cjk_p && eaw == w_A)) /* East Asian Ambiguous */
      width += 2;
    else
      width++; /* Halfwidth or Neutral */
  }
  WStr_free(&wstr);

  return INT2FIX(width);
}