| package runewidth |
| |
| var EastAsianWidth = IsEastAsian() |
| var DefaultCondition = &Condition{EastAsianWidth} |
| |
| type interval struct { |
| first rune |
| last rune |
| } |
| |
| var combining = []interval{ |
| {0x0300, 0x036F}, {0x0483, 0x0486}, {0x0488, 0x0489}, |
| {0x0591, 0x05BD}, {0x05BF, 0x05BF}, {0x05C1, 0x05C2}, |
| {0x05C4, 0x05C5}, {0x05C7, 0x05C7}, {0x0600, 0x0603}, |
| {0x0610, 0x0615}, {0x064B, 0x065E}, {0x0670, 0x0670}, |
| {0x06D6, 0x06E4}, {0x06E7, 0x06E8}, {0x06EA, 0x06ED}, |
| {0x070F, 0x070F}, {0x0711, 0x0711}, {0x0730, 0x074A}, |
| {0x07A6, 0x07B0}, {0x07EB, 0x07F3}, {0x0901, 0x0902}, |
| {0x093C, 0x093C}, {0x0941, 0x0948}, {0x094D, 0x094D}, |
| {0x0951, 0x0954}, {0x0962, 0x0963}, {0x0981, 0x0981}, |
| {0x09BC, 0x09BC}, {0x09C1, 0x09C4}, {0x09CD, 0x09CD}, |
| {0x09E2, 0x09E3}, {0x0A01, 0x0A02}, {0x0A3C, 0x0A3C}, |
| {0x0A41, 0x0A42}, {0x0A47, 0x0A48}, {0x0A4B, 0x0A4D}, |
| {0x0A70, 0x0A71}, {0x0A81, 0x0A82}, {0x0ABC, 0x0ABC}, |
| {0x0AC1, 0x0AC5}, {0x0AC7, 0x0AC8}, {0x0ACD, 0x0ACD}, |
| {0x0AE2, 0x0AE3}, {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}, {0x0CBC, 0x0CBC}, |
| {0x0CBF, 0x0CBF}, {0x0CC6, 0x0CC6}, {0x0CCC, 0x0CCD}, |
| {0x0CE2, 0x0CE3}, {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}, {0x135F, 0x135F}, |
| {0x1712, 0x1714}, {0x1732, 0x1734}, {0x1752, 0x1753}, |
| {0x1772, 0x1773}, {0x17B4, 0x17B5}, {0x17B7, 0x17BD}, |
| {0x17C6, 0x17C6}, {0x17C9, 0x17D3}, {0x17DD, 0x17DD}, |
| {0x180B, 0x180D}, {0x18A9, 0x18A9}, {0x1920, 0x1922}, |
| {0x1927, 0x1928}, {0x1932, 0x1932}, {0x1939, 0x193B}, |
| {0x1A17, 0x1A18}, {0x1B00, 0x1B03}, {0x1B34, 0x1B34}, |
| {0x1B36, 0x1B3A}, {0x1B3C, 0x1B3C}, {0x1B42, 0x1B42}, |
| {0x1B6B, 0x1B73}, {0x1DC0, 0x1DCA}, {0x1DFE, 0x1DFF}, |
| {0x200B, 0x200F}, {0x202A, 0x202E}, {0x2060, 0x2063}, |
| {0x206A, 0x206F}, {0x20D0, 0x20EF}, {0x302A, 0x302F}, |
| {0x3099, 0x309A}, {0xA806, 0xA806}, {0xA80B, 0xA80B}, |
| {0xA825, 0xA826}, {0xFB1E, 0xFB1E}, {0xFE00, 0xFE0F}, |
| {0xFE20, 0xFE23}, {0xFEFF, 0xFEFF}, {0xFFF9, 0xFFFB}, |
| {0x10A01, 0x10A03}, {0x10A05, 0x10A06}, {0x10A0C, 0x10A0F}, |
| {0x10A38, 0x10A3A}, {0x10A3F, 0x10A3F}, {0x1D167, 0x1D169}, |
| {0x1D173, 0x1D182}, {0x1D185, 0x1D18B}, {0x1D1AA, 0x1D1AD}, |
| {0x1D242, 0x1D244}, {0xE0001, 0xE0001}, {0xE0020, 0xE007F}, |
| {0xE0100, 0xE01EF}, |
| } |
| |
| var ambiguous = []interval{ |
| {0x00A1, 0x00A1}, {0x00A4, 0x00A4}, {0x00A7, 0x00A8}, |
| {0x00AA, 0x00AA}, {0x00AE, 0x00AE}, {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, 0x014B}, {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}, |
| {0x02C4, 0x02C4}, {0x02C7, 0x02C7}, {0x02C9, 0x02CB}, |
| {0x02CD, 0x02CD}, {0x02D0, 0x02D0}, {0x02D8, 0x02DB}, |
| {0x02DD, 0x02DD}, {0x02DF, 0x02DF}, {0x0391, 0x03A1}, |
| {0x03A3, 0x03A9}, {0x03B1, 0x03C1}, {0x03C3, 0x03C9}, |
| {0x0401, 0x0401}, {0x0410, 0x044F}, {0x0451, 0x0451}, |
| {0x2010, 0x2010}, {0x2013, 0x2016}, {0x2018, 0x2019}, |
| {0x201C, 0x201D}, {0x2020, 0x2022}, {0x2024, 0x2027}, |
| {0x2030, 0x2030}, {0x2032, 0x2033}, {0x2035, 0x2035}, |
| {0x203B, 0x203B}, {0x203E, 0x203E}, {0x2074, 0x2074}, |
| {0x207F, 0x207F}, {0x2081, 0x2084}, {0x20AC, 0x20AC}, |
| {0x2103, 0x2103}, {0x2105, 0x2105}, {0x2109, 0x2109}, |
| {0x2113, 0x2113}, {0x2116, 0x2116}, {0x2121, 0x2122}, |
| {0x2126, 0x2126}, {0x212B, 0x212B}, {0x2153, 0x2154}, |
| {0x215B, 0x215E}, {0x2160, 0x216B}, {0x2170, 0x2179}, |
| {0x2190, 0x2199}, {0x21B8, 0x21B9}, {0x21D2, 0x21D2}, |
| {0x21D4, 0x21D4}, {0x21E7, 0x21E7}, {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, 0x24E9}, {0x24EB, 0x254B}, |
| {0x2550, 0x2573}, {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}, {0x2614, 0x2615}, |
| {0x261C, 0x261C}, {0x261E, 0x261E}, {0x2640, 0x2640}, |
| {0x2642, 0x2642}, {0x2660, 0x2661}, {0x2663, 0x2665}, |
| {0x2667, 0x266A}, {0x266C, 0x266D}, {0x266F, 0x266F}, |
| {0x273D, 0x273D}, {0x2776, 0x277F}, {0xE000, 0xF8FF}, |
| {0xFFFD, 0xFFFD}, {0xF0000, 0xFFFFD}, {0x100000, 0x10FFFD}, |
| } |
| |
| type Condition struct { |
| EastAsianWidth bool |
| } |
| |
| func NewCondition() *Condition { |
| return &Condition{EastAsianWidth} |
| } |
| |
| // RuneWidth returns the number of cells in r. |
| // See http://www.unicode.org/reports/tr11/ |
| func (c *Condition) RuneWidth(r rune) int { |
| if r == 0 { |
| return 0 |
| } |
| if r < 32 || (r >= 0x7f && r < 0xa0) { |
| return 1 |
| } |
| for _, iv := range combining { |
| if iv.first <= r && r <= iv.last { |
| return 0 |
| } |
| } |
| |
| if c.EastAsianWidth && IsAmbiguousWidth(r) { |
| return 2 |
| } |
| |
| if r >= 0x1100 && |
| (r <= 0x115f || r == 0x2329 || r == 0x232a || |
| (r >= 0x2e80 && r <= 0xa4cf && r != 0x303f) || |
| (r >= 0xac00 && r <= 0xd7a3) || |
| (r >= 0xf900 && r <= 0xfaff) || |
| (r >= 0xfe30 && r <= 0xfe6f) || |
| (r >= 0xff00 && r <= 0xff60) || |
| (r >= 0xffe0 && r <= 0xffe6) || |
| (r >= 0x20000 && r <= 0x2fffd) || |
| (r >= 0x30000 && r <= 0x3fffd)) { |
| return 2 |
| } |
| return 1 |
| } |
| |
| func (c *Condition) StringWidth(s string) (width int) { |
| for _, r := range []rune(s) { |
| width += c.RuneWidth(r) |
| } |
| return width |
| } |
| |
| func (c *Condition) Truncate(s string, w int, tail string) string { |
| r := []rune(s) |
| tw := StringWidth(tail) |
| w -= tw |
| width := 0 |
| i := 0 |
| for ; i < len(r); i++ { |
| cw := RuneWidth(r[i]) |
| if width+cw > w { |
| break |
| } |
| width += cw |
| } |
| if i == len(r) { |
| return string(r[0:i]) |
| } |
| return string(r[0:i]) + tail |
| } |
| |
| // RuneWidth returns the number of cells in r. |
| // See http://www.unicode.org/reports/tr11/ |
| func RuneWidth(r rune) int { |
| return DefaultCondition.RuneWidth(r) |
| } |
| |
| // IsAmbiguousWidth returns whether is ambiguous width or not. |
| func IsAmbiguousWidth(r rune) bool { |
| for _, iv := range ambiguous { |
| if iv.first <= r && r <= iv.last { |
| return true |
| } |
| } |
| return false |
| } |
| |
| func StringWidth(s string) (width int) { |
| return DefaultCondition.StringWidth(s) |
| } |
| |
| func Truncate(s string, w int, tail string) string { |
| return DefaultCondition.Truncate(s, w, tail) |
| } |
