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view gui/src/terminal/konsole_wcwidth.cpp @ 13622:e744593197ef

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added scrollToBottomRequest signal for terminal and flipped around progress bar an dstatus bar in browser widget, so the handle is on the right corner.
author Jacob Dawid <jacob.dawid@googlemail.com>
date Thu, 18 Aug 2011 13:36:20 +0200
parents c70511cf64ee
children
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/* $XFree86: xc/programs/xterm/wcwidth.character,v 1.3 2001/07/29 22:08:16 tsi Exp $ */
/*
 * This is an implementation of wcwidth() and wcswidth() as defined in
 * "The Single UNIX Specification, Version 2, The Open Group, 1997"
 * <http://www.UNIX-systems.org/online.html>
 *
 * Markus Kuhn -- 2001-01-12 -- public domain
 */

#include "konsole_wcwidth.h"

struct interval
{
  unsigned short first;
  unsigned short last;
};

/* auxiliary function for binary search in interval table */
static int
bisearch (quint16 ucs, const struct interval *table, int max)
{
  int min = 0;
  int mid;

  if (ucs < table[0].first || ucs > table[max].last)
    return 0;
  while (max >= min)
    {
      mid = (min + max) / 2;
      if (ucs > table[mid].last)
	min = mid + 1;
      else if (ucs < table[mid].first)
	max = mid - 1;
      else
	return 1;
    }

  return 0;
}


/* The following functions define the column width of an ISO 10646
 * character as follows:
 *
 *    - The null character (U+0000) has a column width of 0.
 *
 *    - Other C0/C1 control characters and DEL will lead to a return
 *      value of -1.
 *
 *    - Non-spacing and enclosing combining characters (general
 *      category code Mn or Me in the Unicode database) have a
 *      column width of 0.
 *
 *    - Other format characters (general category code Cf in the Unicode
 *      database) and ZERO WIDTH SPACE (U+200B) have a column width of 0.
 *
 *    - Hangul Jamo medial vowels and final consonants (U+1160-U+11FF)
 *      have a column width of 0.
 *
 *    - Spacing characters in the East Asian Wide (W) or East Asian
 *      FullWidth (F) category as defined in Unicode Technical
 *      Report #11 have a column width of 2.
 *
 *    - All remaining characters (including all printable
 *      ISO 8859-1 and WGL4 characters, Unicode control characters,
 *      etc.) have a column width of 1.
 *
 * This implementation assumes that quint16 characters are encoded
 * in ISO 10646.
 */

int
konsole_wcwidth (quint16 ucs)
{
  /* sorted list of non-overlapping intervals of non-spacing characters */
  static const struct interval combining[] = {
    {0x0300, 0x034E}, {0x0360, 0x0362}, {0x0483, 0x0486},
    {0x0488, 0x0489}, {0x0591, 0x05A1}, {0x05A3, 0x05B9},
    {0x05BB, 0x05BD}, {0x05BF, 0x05BF}, {0x05C1, 0x05C2},
    {0x05C4, 0x05C4}, {0x064B, 0x0655}, {0x0670, 0x0670},
    {0x06D6, 0x06E4}, {0x06E7, 0x06E8}, {0x06EA, 0x06ED},
    {0x070F, 0x070F}, {0x0711, 0x0711}, {0x0730, 0x074A},
    {0x07A6, 0x07B0}, {0x0901, 0x0902}, {0x093C, 0x093C},
    {0x0941, 0x0948}, {0x094D, 0x094D}, {0x0951, 0x0954},
    {0x0962, 0x0963}, {0x0981, 0x0981}, {0x09BC, 0x09BC},
    {0x09C1, 0x09C4}, {0x09CD, 0x09CD}, {0x09E2, 0x09E3},
    {0x0A02, 0x0A02}, {0x0A3C, 0x0A3C}, {0x0A41, 0x0A42},
    {0x0A47, 0x0A48}, {0x0A4B, 0x0A4D}, {0x0A70, 0x0A71},
    {0x0A81, 0x0A82}, {0x0ABC, 0x0ABC}, {0x0AC1, 0x0AC5},
    {0x0AC7, 0x0AC8}, {0x0ACD, 0x0ACD}, {0x0B01, 0x0B01},
    {0x0B3C, 0x0B3C}, {0x0B3F, 0x0B3F}, {0x0B41, 0x0B43},
    {0x0B4D, 0x0B4D}, {0x0B56, 0x0B56}, {0x0B82, 0x0B82},
    {0x0BC0, 0x0BC0}, {0x0BCD, 0x0BCD}, {0x0C3E, 0x0C40},
    {0x0C46, 0x0C48}, {0x0C4A, 0x0C4D}, {0x0C55, 0x0C56},
    {0x0CBF, 0x0CBF}, {0x0CC6, 0x0CC6}, {0x0CCC, 0x0CCD},
    {0x0D41, 0x0D43}, {0x0D4D, 0x0D4D}, {0x0DCA, 0x0DCA},
    {0x0DD2, 0x0DD4}, {0x0DD6, 0x0DD6}, {0x0E31, 0x0E31},
    {0x0E34, 0x0E3A}, {0x0E47, 0x0E4E}, {0x0EB1, 0x0EB1},
    {0x0EB4, 0x0EB9}, {0x0EBB, 0x0EBC}, {0x0EC8, 0x0ECD},
    {0x0F18, 0x0F19}, {0x0F35, 0x0F35}, {0x0F37, 0x0F37},
    {0x0F39, 0x0F39}, {0x0F71, 0x0F7E}, {0x0F80, 0x0F84},
    {0x0F86, 0x0F87}, {0x0F90, 0x0F97}, {0x0F99, 0x0FBC},
    {0x0FC6, 0x0FC6}, {0x102D, 0x1030}, {0x1032, 0x1032},
    {0x1036, 0x1037}, {0x1039, 0x1039}, {0x1058, 0x1059},
    {0x1160, 0x11FF}, {0x17B7, 0x17BD}, {0x17C6, 0x17C6},
    {0x17C9, 0x17D3}, {0x180B, 0x180E}, {0x18A9, 0x18A9},
    {0x200B, 0x200F}, {0x202A, 0x202E}, {0x206A, 0x206F},
    {0x20D0, 0x20E3}, {0x302A, 0x302F}, {0x3099, 0x309A},
    {0xFB1E, 0xFB1E}, {0xFE20, 0xFE23}, {0xFEFF, 0xFEFF},
    {0xFFF9, 0xFFFB}
  };

  /* test for 8-bit control characters */
  if (ucs == 0)
    return 0;
  if (ucs < 32 || (ucs >= 0x7f && ucs < 0xa0))
    return -1;

  /* binary search in table of non-spacing characters */
  if (bisearch (ucs, combining,
		sizeof (combining) / sizeof (struct interval) - 1))
    return 0;

  /* if we arrive here, ucs is not a combining or C0/C1 control character */

  return 1 + (ucs >= 0x1100 && (ucs <= 0x115f ||	/* Hangul Jamo init. consonants */
				(ucs >= 0x2e80 && ucs <= 0xa4cf && (ucs & ~0x0011) != 0x300a && ucs != 0x303f) ||	/* CJK ... Yi */
				(ucs >= 0xac00 && ucs <= 0xd7a3) ||	/* Hangul Syllables */
				(ucs >= 0xf900 && ucs <= 0xfaff) ||	/* CJK Compatibility Ideographs */
				(ucs >= 0xfe30 && ucs <= 0xfe6f) ||	/* CJK Compatibility Forms */
				(ucs >= 0xff00 && ucs <= 0xff5f) ||	/* Fullwidth Forms */
				(ucs >= 0xffe0 && ucs <= 0xffe6)	/* do not compare UINT16 with 0x20000 ||
									   (ucs >= 0x20000 && ucs <= 0x2ffff) */ ));
}

#if 0
/*
 * The following function is the same as konsole_wcwidth(), except that
 * spacing characters in the East Asian Ambiguous (A) category as
 * defined in Unicode Technical Report #11 have a column width of 2.
 * This experimental variant might be useful for users of CJK legacy
 * encodings who want to migrate to UCS. It is not otherwise
 * recommended for general use.
 */
int
konsole_wcwidth_cjk (quint16 ucs)
{
  /* sorted list of non-overlapping intervals of East Asian Ambiguous
   * characters */
  static const struct interval ambiguous[] = {
    {0x00A1, 0x00A1}, {0x00A4, 0x00A4}, {0x00A7, 0x00A8},
    {0x00AA, 0x00AA}, {0x00AD, 0x00AD}, {0x00B0, 0x00B4},
    {0x00B6, 0x00BA}, {0x00BC, 0x00BF}, {0x00C6, 0x00C6},
    {0x00D0, 0x00D0}, {0x00D7, 0x00D8}, {0x00DE, 0x00E1},
    {0x00E6, 0x00E6}, {0x00E8, 0x00EA}, {0x00EC, 0x00ED},
    {0x00F0, 0x00F0}, {0x00F2, 0x00F3}, {0x00F7, 0x00FA},
    {0x00FC, 0x00FC}, {0x00FE, 0x00FE}, {0x0101, 0x0101},
    {0x0111, 0x0111}, {0x0113, 0x0113}, {0x011B, 0x011B},
    {0x0126, 0x0127}, {0x012B, 0x012B}, {0x0131, 0x0133},
    {0x0138, 0x0138}, {0x013F, 0x0142}, {0x0144, 0x0144},
    {0x0148, 0x014A}, {0x014D, 0x014D}, {0x0152, 0x0153},
    {0x0166, 0x0167}, {0x016B, 0x016B}, {0x01CE, 0x01CE},
    {0x01D0, 0x01D0}, {0x01D2, 0x01D2}, {0x01D4, 0x01D4},
    {0x01D6, 0x01D6}, {0x01D8, 0x01D8}, {0x01DA, 0x01DA},
    {0x01DC, 0x01DC}, {0x0251, 0x0251}, {0x0261, 0x0261},
    {0x02C7, 0x02C7}, {0x02C9, 0x02CB}, {0x02CD, 0x02CD},
    {0x02D0, 0x02D0}, {0x02D8, 0x02DB}, {0x02DD, 0x02DD},
    {0x0391, 0x03A1}, {0x03A3, 0x03A9}, {0x03B1, 0x03C1},
    {0x03C3, 0x03C9}, {0x0401, 0x0401}, {0x0410, 0x044F},
    {0x0451, 0x0451}, {0x2010, 0x2010}, {0x2013, 0x2016},
    {0x2018, 0x2019}, {0x201C, 0x201D}, {0x2020, 0x2021},
    {0x2025, 0x2027}, {0x2030, 0x2030}, {0x2032, 0x2033},
    {0x2035, 0x2035}, {0x203B, 0x203B}, {0x2074, 0x2074},
    {0x207F, 0x207F}, {0x2081, 0x2084}, {0x20AC, 0x20AC},
    {0x2103, 0x2103}, {0x2105, 0x2105}, {0x2109, 0x2109},
    {0x2113, 0x2113}, {0x2121, 0x2122}, {0x2126, 0x2126},
    {0x212B, 0x212B}, {0x2154, 0x2155}, {0x215B, 0x215B},
    {0x215E, 0x215E}, {0x2160, 0x216B}, {0x2170, 0x2179},
    {0x2190, 0x2199}, {0x21D2, 0x21D2}, {0x21D4, 0x21D4},
    {0x2200, 0x2200}, {0x2202, 0x2203}, {0x2207, 0x2208},
    {0x220B, 0x220B}, {0x220F, 0x220F}, {0x2211, 0x2211},
    {0x2215, 0x2215}, {0x221A, 0x221A}, {0x221D, 0x2220},
    {0x2223, 0x2223}, {0x2225, 0x2225}, {0x2227, 0x222C},
    {0x222E, 0x222E}, {0x2234, 0x2237}, {0x223C, 0x223D},
    {0x2248, 0x2248}, {0x224C, 0x224C}, {0x2252, 0x2252},
    {0x2260, 0x2261}, {0x2264, 0x2267}, {0x226A, 0x226B},
    {0x226E, 0x226F}, {0x2282, 0x2283}, {0x2286, 0x2287},
    {0x2295, 0x2295}, {0x2299, 0x2299}, {0x22A5, 0x22A5},
    {0x22BF, 0x22BF}, {0x2312, 0x2312}, {0x2460, 0x24BF},
    {0x24D0, 0x24E9}, {0x2500, 0x254B}, {0x2550, 0x2574},
    {0x2580, 0x258F}, {0x2592, 0x2595}, {0x25A0, 0x25A1},
    {0x25A3, 0x25A9}, {0x25B2, 0x25B3}, {0x25B6, 0x25B7},
    {0x25BC, 0x25BD}, {0x25C0, 0x25C1}, {0x25C6, 0x25C8},
    {0x25CB, 0x25CB}, {0x25CE, 0x25D1}, {0x25E2, 0x25E5},
    {0x25EF, 0x25EF}, {0x2605, 0x2606}, {0x2609, 0x2609},
    {0x260E, 0x260F}, {0x261C, 0x261C}, {0x261E, 0x261E},
    {0x2640, 0x2640}, {0x2642, 0x2642}, {0x2660, 0x2661},
    {0x2663, 0x2665}, {0x2667, 0x266A}, {0x266C, 0x266D},
    {0x266F, 0x266F}, {0x300A, 0x300B}, {0x301A, 0x301B},
    {0xE000, 0xF8FF}, {0xFFFD, 0xFFFD}
  };

  /* binary search in table of non-spacing characters */
  if (bisearch (ucs, ambiguous,
		sizeof (ambiguous) / sizeof (struct interval) - 1))
    return 2;

  return konsole_wcwidth (ucs);
}
#endif

// single byte char: +1, multi byte char: +2
int
string_width (const QString & txt)
{
  int w = 0;
  for (int i = 0; i < txt.length (); ++i)
    w += konsole_wcwidth (txt[i].unicode ());
  return w;
}