/** * Copyright (c) 2016 The xterm.js authors. All rights reserved. * @license MIT */ export const wcwidth = (function(opts: {nul: number, control: number}): (ucs: number) => number { // extracted from https://www.cl.cam.ac.uk/%7Emgk25/ucs/wcwidth.c // combining characters const COMBINING_BMP = [ [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], ]; const COMBINING_HIGH = [ [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] ]; // binary search function bisearch(ucs: number, data: number[][]): boolean { let min = 0; let max = data.length - 1; let mid; if (ucs < data[0][0] || ucs > data[max][1]) return false; while (max >= min) { mid = (min + max) >> 1; if (ucs > data[mid][1]) min = mid + 1; else if (ucs < data[mid][0]) max = mid - 1; else return true; } return false; } function wcwidthBMP(ucs: number): number { // test for 8-bit control characters if (ucs === 0) return opts.nul; if (ucs < 32 || (ucs >= 0x7f && ucs < 0xa0)) return opts.control; // binary search in table of non-spacing characters if (bisearch(ucs, COMBINING_BMP)) return 0; // if we arrive here, ucs is not a combining or C0/C1 control character if (isWideBMP(ucs)) { return 2; } return 1; } function isWideBMP(ucs: number): boolean { return ( ucs >= 0x1100 && ( ucs <= 0x115f || // Hangul Jamo init. consonants ucs === 0x2329 || ucs === 0x232a || (ucs >= 0x2e80 && ucs <= 0xa4cf && ucs !== 0x303f) || // CJK..Yi (ucs >= 0xac00 && ucs <= 0xd7a3) || // Hangul Syllables (ucs >= 0xf900 && ucs <= 0xfaff) || // CJK Compat Ideographs (ucs >= 0xfe10 && ucs <= 0xfe19) || // Vertical forms (ucs >= 0xfe30 && ucs <= 0xfe6f) || // CJK Compat Forms (ucs >= 0xff00 && ucs <= 0xff60) || // Fullwidth Forms (ucs >= 0xffe0 && ucs <= 0xffe6))); } function wcwidthHigh(ucs: number): 0 | 1 | 2 { if (bisearch(ucs, COMBINING_HIGH)) return 0; if ((ucs >= 0x20000 && ucs <= 0x2fffd) || (ucs >= 0x30000 && ucs <= 0x3fffd)) { return 2; } return 1; } const control = opts.control | 0; let table: number[] | Uint32Array = null; function init_table(): number[] | Uint32Array { // lookup table for BMP const CODEPOINTS = 65536; // BMP holds 65536 codepoints const BITWIDTH = 2; // a codepoint can have a width of 0, 1 or 2 const ITEMSIZE = 32; // using uint32_t const CONTAINERSIZE = CODEPOINTS * BITWIDTH / ITEMSIZE; const CODEPOINTS_PER_ITEM = ITEMSIZE / BITWIDTH; table = (typeof Uint32Array === 'undefined') ? new Array(CONTAINERSIZE) : new Uint32Array(CONTAINERSIZE); for (let i = 0; i < CONTAINERSIZE; ++i) { let num = 0; let pos = CODEPOINTS_PER_ITEM; while (pos--) num = (num << 2) | wcwidthBMP(CODEPOINTS_PER_ITEM * i + pos); table[i] = num; } return table; } // get width from lookup table // position in container : num / CODEPOINTS_PER_ITEM // ==> n = table[Math.floor(num / 16)] // ==> n = table[num >> 4] // 16 codepoints per number: FFEEDDCCBBAA99887766554433221100 // position in number : (num % CODEPOINTS_PER_ITEM) * BITWIDTH // ==> m = (n % 16) * 2 // ==> m = (num & 15) << 1 // right shift to position m // ==> n = n >> m e.g. m=12 000000000000FFEEDDCCBBAA99887766 // we are only interested in 2 LSBs, cut off higher bits // ==> n = n & 3 e.g. 000000000000000000000000000000XX return function (num: number): number { num = num | 0; // get asm.js like optimization under V8 if (num < 32) return control | 0; if (num < 127) return 1; let t = table || init_table(); if (num < 65536) return t[num >> 4] >> ((num & 15) << 1) & 3; // do a full search for high codepoints return wcwidthHigh(num); }; })({nul: 0, control: 0}); // configurable options