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https://git.proxmox.com/git/mirror_xterm.js
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Merge pull request #798 from jerch/faster_wcwidth
faster wcwidth with lookup table
This commit is contained in:
Daniel Imms
GitHub
commit
05d308a37a
@ -1,5 +1,6 @@
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import { assert } from 'chai';
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import { InputHandler } from './InputHandler';
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import { wcwidth } from './InputHandler';
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describe('InputHandler', () => {
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describe('setCursorStyle', () => {
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@ -47,3 +48,139 @@ describe('InputHandler', () => {
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});
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});
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});
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const old_wcwidth = (function(opts) {
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// extracted from https://www.cl.cam.ac.uk/%7Emgk25/ucs/wcwidth.c
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// combining characters
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const COMBINING = [
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[0x0300, 0x036F], [0x0483, 0x0486], [0x0488, 0x0489],
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[0x0591, 0x05BD], [0x05BF, 0x05BF], [0x05C1, 0x05C2],
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[0x05C4, 0x05C5], [0x05C7, 0x05C7], [0x0600, 0x0603],
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[0x0610, 0x0615], [0x064B, 0x065E], [0x0670, 0x0670],
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[0x06D6, 0x06E4], [0x06E7, 0x06E8], [0x06EA, 0x06ED],
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[0x070F, 0x070F], [0x0711, 0x0711], [0x0730, 0x074A],
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[0x07A6, 0x07B0], [0x07EB, 0x07F3], [0x0901, 0x0902],
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[0x093C, 0x093C], [0x0941, 0x0948], [0x094D, 0x094D],
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[0x0951, 0x0954], [0x0962, 0x0963], [0x0981, 0x0981],
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[0x09BC, 0x09BC], [0x09C1, 0x09C4], [0x09CD, 0x09CD],
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[0x09E2, 0x09E3], [0x0A01, 0x0A02], [0x0A3C, 0x0A3C],
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[0x0A41, 0x0A42], [0x0A47, 0x0A48], [0x0A4B, 0x0A4D],
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[0x0A70, 0x0A71], [0x0A81, 0x0A82], [0x0ABC, 0x0ABC],
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[0x0AC1, 0x0AC5], [0x0AC7, 0x0AC8], [0x0ACD, 0x0ACD],
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[0x0AE2, 0x0AE3], [0x0B01, 0x0B01], [0x0B3C, 0x0B3C],
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[0x0B3F, 0x0B3F], [0x0B41, 0x0B43], [0x0B4D, 0x0B4D],
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[0x0B56, 0x0B56], [0x0B82, 0x0B82], [0x0BC0, 0x0BC0],
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[0x0BCD, 0x0BCD], [0x0C3E, 0x0C40], [0x0C46, 0x0C48],
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[0x0C4A, 0x0C4D], [0x0C55, 0x0C56], [0x0CBC, 0x0CBC],
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[0x0CBF, 0x0CBF], [0x0CC6, 0x0CC6], [0x0CCC, 0x0CCD],
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[0x0CE2, 0x0CE3], [0x0D41, 0x0D43], [0x0D4D, 0x0D4D],
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[0x0DCA, 0x0DCA], [0x0DD2, 0x0DD4], [0x0DD6, 0x0DD6],
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[0x0E31, 0x0E31], [0x0E34, 0x0E3A], [0x0E47, 0x0E4E],
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[0x0EB1, 0x0EB1], [0x0EB4, 0x0EB9], [0x0EBB, 0x0EBC],
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[0x0EC8, 0x0ECD], [0x0F18, 0x0F19], [0x0F35, 0x0F35],
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[0x0F37, 0x0F37], [0x0F39, 0x0F39], [0x0F71, 0x0F7E],
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[0x0F80, 0x0F84], [0x0F86, 0x0F87], [0x0F90, 0x0F97],
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[0x0F99, 0x0FBC], [0x0FC6, 0x0FC6], [0x102D, 0x1030],
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[0x1032, 0x1032], [0x1036, 0x1037], [0x1039, 0x1039],
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[0x1058, 0x1059], [0x1160, 0x11FF], [0x135F, 0x135F],
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[0x1712, 0x1714], [0x1732, 0x1734], [0x1752, 0x1753],
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[0x1772, 0x1773], [0x17B4, 0x17B5], [0x17B7, 0x17BD],
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[0x17C6, 0x17C6], [0x17C9, 0x17D3], [0x17DD, 0x17DD],
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[0x180B, 0x180D], [0x18A9, 0x18A9], [0x1920, 0x1922],
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[0x1927, 0x1928], [0x1932, 0x1932], [0x1939, 0x193B],
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[0x1A17, 0x1A18], [0x1B00, 0x1B03], [0x1B34, 0x1B34],
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[0x1B36, 0x1B3A], [0x1B3C, 0x1B3C], [0x1B42, 0x1B42],
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[0x1B6B, 0x1B73], [0x1DC0, 0x1DCA], [0x1DFE, 0x1DFF],
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[0x200B, 0x200F], [0x202A, 0x202E], [0x2060, 0x2063],
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[0x206A, 0x206F], [0x20D0, 0x20EF], [0x302A, 0x302F],
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[0x3099, 0x309A], [0xA806, 0xA806], [0xA80B, 0xA80B],
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[0xA825, 0xA826], [0xFB1E, 0xFB1E], [0xFE00, 0xFE0F],
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[0xFE20, 0xFE23], [0xFEFF, 0xFEFF], [0xFFF9, 0xFFFB],
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[0x10A01, 0x10A03], [0x10A05, 0x10A06], [0x10A0C, 0x10A0F],
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[0x10A38, 0x10A3A], [0x10A3F, 0x10A3F], [0x1D167, 0x1D169],
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[0x1D173, 0x1D182], [0x1D185, 0x1D18B], [0x1D1AA, 0x1D1AD],
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[0x1D242, 0x1D244], [0xE0001, 0xE0001], [0xE0020, 0xE007F],
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[0xE0100, 0xE01EF]
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];
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// binary search
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function bisearch(ucs) {
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let min = 0;
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let max = COMBINING.length - 1;
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let mid;
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if (ucs < COMBINING[0][0] || ucs > COMBINING[max][1])
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return false;
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while (max >= min) {
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mid = Math.floor((min + max) / 2);
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if (ucs > COMBINING[mid][1])
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min = mid + 1;
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else if (ucs < COMBINING[mid][0])
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max = mid - 1;
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else
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return true;
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}
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return false;
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}
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function wcwidth(ucs) {
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// test for 8-bit control characters
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if (ucs === 0)
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return opts.nul;
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if (ucs < 32 || (ucs >= 0x7f && ucs < 0xa0))
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return opts.control;
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// binary search in table of non-spacing characters
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if (bisearch(ucs))
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return 0;
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// if we arrive here, ucs is not a combining or C0/C1 control character
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if (isWide(ucs)) {
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return 2;
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}
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return 1;
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}
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function isWide(ucs) {
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return (
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ucs >= 0x1100 && (
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ucs <= 0x115f || // Hangul Jamo init. consonants
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ucs === 0x2329 ||
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ucs === 0x232a ||
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(ucs >= 0x2e80 && ucs <= 0xa4cf && ucs !== 0x303f) || // CJK..Yi
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(ucs >= 0xac00 && ucs <= 0xd7a3) || // Hangul Syllables
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(ucs >= 0xf900 && ucs <= 0xfaff) || // CJK Compat Ideographs
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(ucs >= 0xfe10 && ucs <= 0xfe19) || // Vertical forms
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(ucs >= 0xfe30 && ucs <= 0xfe6f) || // CJK Compat Forms
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(ucs >= 0xff00 && ucs <= 0xff60) || // Fullwidth Forms
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(ucs >= 0xffe0 && ucs <= 0xffe6) ||
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(ucs >= 0x20000 && ucs <= 0x2fffd) ||
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(ucs >= 0x30000 && ucs <= 0x3fffd)));
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}
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return wcwidth;
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})({nul: 0, control: 0}); // configurable options
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describe('wcwidth', () => {
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it('same as old implementation for BMP and individual higher', (done) => {
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for (let i = 0; i < 65536; ++i)
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assert.equal(wcwidth(i), old_wcwidth(i));
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// test some individual higher to fullfill branching
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assert.equal(wcwidth(0x10A01), old_wcwidth(0x10A01));
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assert.equal(wcwidth(0x30000), old_wcwidth(0x30000));
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assert.equal(wcwidth(0x3fffe), old_wcwidth(0x3fffe));
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done();
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}).timeout(3000);
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/*
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it('new is at least 5 times faster', () => {
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let start_new = new Date().getTime();
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let x = 0;
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for (let runs = 0; runs < 1; ++runs)
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for (let i = 0; i < 65536; ++i)
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x = wcwidth(i);
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let end_new = new Date().getTime();
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let start_old = new Date().getTime();
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let y = 0;
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for (let runs = 0; runs < 1; ++runs)
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for (let i = 0; i < 65536; ++i)
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y = old_wcwidth(i);
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let end_old = new Date().getTime();
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// console.log((end_new - start_new));
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// console.log((end_old - start_old));
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assert.equal(((end_new - start_new) * 5 < (end_old - start_old)), true);
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});
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*/
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});
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@ -1462,95 +1462,97 @@ export class InputHandler implements IInputHandler {
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}
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}
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const wcwidth = (function(opts) {
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// extracted from https://www.cl.cam.ac.uk/%7Emgk25/ucs/wcwidth.c
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// combining characters
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const COMBINING = [
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[0x0300, 0x036F], [0x0483, 0x0486], [0x0488, 0x0489],
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[0x0591, 0x05BD], [0x05BF, 0x05BF], [0x05C1, 0x05C2],
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[0x05C4, 0x05C5], [0x05C7, 0x05C7], [0x0600, 0x0603],
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[0x0610, 0x0615], [0x064B, 0x065E], [0x0670, 0x0670],
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[0x06D6, 0x06E4], [0x06E7, 0x06E8], [0x06EA, 0x06ED],
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[0x070F, 0x070F], [0x0711, 0x0711], [0x0730, 0x074A],
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[0x07A6, 0x07B0], [0x07EB, 0x07F3], [0x0901, 0x0902],
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[0x093C, 0x093C], [0x0941, 0x0948], [0x094D, 0x094D],
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[0x0951, 0x0954], [0x0962, 0x0963], [0x0981, 0x0981],
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[0x09BC, 0x09BC], [0x09C1, 0x09C4], [0x09CD, 0x09CD],
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[0x09E2, 0x09E3], [0x0A01, 0x0A02], [0x0A3C, 0x0A3C],
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[0x0A41, 0x0A42], [0x0A47, 0x0A48], [0x0A4B, 0x0A4D],
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[0x0A70, 0x0A71], [0x0A81, 0x0A82], [0x0ABC, 0x0ABC],
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[0x0AC1, 0x0AC5], [0x0AC7, 0x0AC8], [0x0ACD, 0x0ACD],
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[0x0AE2, 0x0AE3], [0x0B01, 0x0B01], [0x0B3C, 0x0B3C],
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[0x0B3F, 0x0B3F], [0x0B41, 0x0B43], [0x0B4D, 0x0B4D],
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[0x0B56, 0x0B56], [0x0B82, 0x0B82], [0x0BC0, 0x0BC0],
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[0x0BCD, 0x0BCD], [0x0C3E, 0x0C40], [0x0C46, 0x0C48],
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[0x0C4A, 0x0C4D], [0x0C55, 0x0C56], [0x0CBC, 0x0CBC],
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[0x0CBF, 0x0CBF], [0x0CC6, 0x0CC6], [0x0CCC, 0x0CCD],
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[0x0CE2, 0x0CE3], [0x0D41, 0x0D43], [0x0D4D, 0x0D4D],
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[0x0DCA, 0x0DCA], [0x0DD2, 0x0DD4], [0x0DD6, 0x0DD6],
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[0x0E31, 0x0E31], [0x0E34, 0x0E3A], [0x0E47, 0x0E4E],
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[0x0EB1, 0x0EB1], [0x0EB4, 0x0EB9], [0x0EBB, 0x0EBC],
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[0x0EC8, 0x0ECD], [0x0F18, 0x0F19], [0x0F35, 0x0F35],
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[0x0F37, 0x0F37], [0x0F39, 0x0F39], [0x0F71, 0x0F7E],
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[0x0F80, 0x0F84], [0x0F86, 0x0F87], [0x0F90, 0x0F97],
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[0x0F99, 0x0FBC], [0x0FC6, 0x0FC6], [0x102D, 0x1030],
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[0x1032, 0x1032], [0x1036, 0x1037], [0x1039, 0x1039],
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[0x1058, 0x1059], [0x1160, 0x11FF], [0x135F, 0x135F],
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[0x1712, 0x1714], [0x1732, 0x1734], [0x1752, 0x1753],
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[0x1772, 0x1773], [0x17B4, 0x17B5], [0x17B7, 0x17BD],
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[0x17C6, 0x17C6], [0x17C9, 0x17D3], [0x17DD, 0x17DD],
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[0x180B, 0x180D], [0x18A9, 0x18A9], [0x1920, 0x1922],
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[0x1927, 0x1928], [0x1932, 0x1932], [0x1939, 0x193B],
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[0x1A17, 0x1A18], [0x1B00, 0x1B03], [0x1B34, 0x1B34],
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[0x1B36, 0x1B3A], [0x1B3C, 0x1B3C], [0x1B42, 0x1B42],
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[0x1B6B, 0x1B73], [0x1DC0, 0x1DCA], [0x1DFE, 0x1DFF],
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[0x200B, 0x200F], [0x202A, 0x202E], [0x2060, 0x2063],
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[0x206A, 0x206F], [0x20D0, 0x20EF], [0x302A, 0x302F],
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[0x3099, 0x309A], [0xA806, 0xA806], [0xA80B, 0xA80B],
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[0xA825, 0xA826], [0xFB1E, 0xFB1E], [0xFE00, 0xFE0F],
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[0xFE20, 0xFE23], [0xFEFF, 0xFEFF], [0xFFF9, 0xFFFB],
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[0x10A01, 0x10A03], [0x10A05, 0x10A06], [0x10A0C, 0x10A0F],
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[0x10A38, 0x10A3A], [0x10A3F, 0x10A3F], [0x1D167, 0x1D169],
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[0x1D173, 0x1D182], [0x1D185, 0x1D18B], [0x1D1AA, 0x1D1AD],
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[0x1D242, 0x1D244], [0xE0001, 0xE0001], [0xE0020, 0xE007F],
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[0xE0100, 0xE01EF]
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];
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// binary search
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function bisearch(ucs) {
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let min = 0;
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let max = COMBINING.length - 1;
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let mid;
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if (ucs < COMBINING[0][0] || ucs > COMBINING[max][1])
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export const wcwidth = (function(opts) {
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// extracted from https://www.cl.cam.ac.uk/%7Emgk25/ucs/wcwidth.c
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// combining characters
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const COMBINING_BMP = [
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[0x0300, 0x036F], [0x0483, 0x0486], [0x0488, 0x0489],
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[0x0591, 0x05BD], [0x05BF, 0x05BF], [0x05C1, 0x05C2],
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[0x05C4, 0x05C5], [0x05C7, 0x05C7], [0x0600, 0x0603],
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[0x0610, 0x0615], [0x064B, 0x065E], [0x0670, 0x0670],
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[0x06D6, 0x06E4], [0x06E7, 0x06E8], [0x06EA, 0x06ED],
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[0x070F, 0x070F], [0x0711, 0x0711], [0x0730, 0x074A],
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[0x07A6, 0x07B0], [0x07EB, 0x07F3], [0x0901, 0x0902],
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[0x093C, 0x093C], [0x0941, 0x0948], [0x094D, 0x094D],
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[0x0951, 0x0954], [0x0962, 0x0963], [0x0981, 0x0981],
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[0x09BC, 0x09BC], [0x09C1, 0x09C4], [0x09CD, 0x09CD],
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[0x09E2, 0x09E3], [0x0A01, 0x0A02], [0x0A3C, 0x0A3C],
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[0x0A41, 0x0A42], [0x0A47, 0x0A48], [0x0A4B, 0x0A4D],
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[0x0A70, 0x0A71], [0x0A81, 0x0A82], [0x0ABC, 0x0ABC],
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[0x0AC1, 0x0AC5], [0x0AC7, 0x0AC8], [0x0ACD, 0x0ACD],
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[0x0AE2, 0x0AE3], [0x0B01, 0x0B01], [0x0B3C, 0x0B3C],
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[0x0B3F, 0x0B3F], [0x0B41, 0x0B43], [0x0B4D, 0x0B4D],
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[0x0B56, 0x0B56], [0x0B82, 0x0B82], [0x0BC0, 0x0BC0],
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[0x0BCD, 0x0BCD], [0x0C3E, 0x0C40], [0x0C46, 0x0C48],
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[0x0C4A, 0x0C4D], [0x0C55, 0x0C56], [0x0CBC, 0x0CBC],
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[0x0CBF, 0x0CBF], [0x0CC6, 0x0CC6], [0x0CCC, 0x0CCD],
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[0x0CE2, 0x0CE3], [0x0D41, 0x0D43], [0x0D4D, 0x0D4D],
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[0x0DCA, 0x0DCA], [0x0DD2, 0x0DD4], [0x0DD6, 0x0DD6],
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[0x0E31, 0x0E31], [0x0E34, 0x0E3A], [0x0E47, 0x0E4E],
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[0x0EB1, 0x0EB1], [0x0EB4, 0x0EB9], [0x0EBB, 0x0EBC],
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[0x0EC8, 0x0ECD], [0x0F18, 0x0F19], [0x0F35, 0x0F35],
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[0x0F37, 0x0F37], [0x0F39, 0x0F39], [0x0F71, 0x0F7E],
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[0x0F80, 0x0F84], [0x0F86, 0x0F87], [0x0F90, 0x0F97],
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[0x0F99, 0x0FBC], [0x0FC6, 0x0FC6], [0x102D, 0x1030],
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[0x1032, 0x1032], [0x1036, 0x1037], [0x1039, 0x1039],
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[0x1058, 0x1059], [0x1160, 0x11FF], [0x135F, 0x135F],
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[0x1712, 0x1714], [0x1732, 0x1734], [0x1752, 0x1753],
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[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, data) {
|
||||
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;
|
||||
while (max >= min) {
|
||||
mid = Math.floor((min + max) / 2);
|
||||
if (ucs > COMBINING[mid][1])
|
||||
min = mid + 1;
|
||||
else if (ucs < COMBINING[mid][0])
|
||||
max = mid - 1;
|
||||
else
|
||||
return true;
|
||||
}
|
||||
return false;
|
||||
}
|
||||
function wcwidth(ucs) {
|
||||
// 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))
|
||||
return 0;
|
||||
// if we arrive here, ucs is not a combining or C0/C1 control character
|
||||
if (isWide(ucs)) {
|
||||
return 2;
|
||||
function wcwidthBMP(ucs) {
|
||||
// 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;
|
||||
}
|
||||
return 1;
|
||||
}
|
||||
function isWide(ucs) {
|
||||
return (
|
||||
ucs >= 0x1100 && (
|
||||
function isWideBMP(ucs) {
|
||||
return (
|
||||
ucs >= 0x1100 && (
|
||||
ucs <= 0x115f || // Hangul Jamo init. consonants
|
||||
ucs === 0x2329 ||
|
||||
ucs === 0x232a ||
|
||||
@ -1560,9 +1562,59 @@ const wcwidth = (function(opts) {
|
||||
(ucs >= 0xfe10 && ucs <= 0xfe19) || // Vertical forms
|
||||
(ucs >= 0xfe30 && ucs <= 0xfe6f) || // CJK Compat Forms
|
||||
(ucs >= 0xff00 && ucs <= 0xff60) || // Fullwidth Forms
|
||||
(ucs >= 0xffe0 && ucs <= 0xffe6) ||
|
||||
(ucs >= 0x20000 && ucs <= 0x2fffd) ||
|
||||
(ucs >= 0x30000 && ucs <= 0x3fffd)));
|
||||
}
|
||||
return wcwidth;
|
||||
(ucs >= 0xffe0 && ucs <= 0xffe6)));
|
||||
}
|
||||
function wcwidthHigh(ucs) {
|
||||
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 = null;
|
||||
function init_table() {
|
||||
// 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) {
|
||||
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
|
||||
|
||||
Loading…
Reference in New Issue
Block a user