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some fixes
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- commenting the bit shifts
- switching to Uint32Array
- conditional for TypedArray
- fixing Math.floor slowdown in bisearch
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@jerch
jerch committed Jul 16, 2017
1 parent 5d87b54 commit 1232c00
Showing 1 changed file with 120 additions and 99 deletions.
219 changes: 120 additions & 99 deletions src/InputHandler.ts
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Expand Up @@ -1494,92 +1494,92 @@ export const wcwidth = (function(opts) {
// 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],
[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]
[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 = Math.floor((min + max) / 2);
if (ucs > data[mid][1])
min = mid + 1;
else if (ucs < data[mid][0])
max = mid - 1;
else
return true;
}
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) {
// 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;
// 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) {
return (
return (
ucs >= 0x1100 && (
ucs <= 0x115f || // Hangul Jamo init. consonants
ucs === 0x2329 ||
Expand All @@ -1593,29 +1593,50 @@ export const wcwidth = (function(opts) {
(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;
}
let table = new Uint8Array(16384);
for (let i = 0; i < 16384; ++i) {
let j = i * 4;
let num = 0;
num |= (wcwidthBMP(j + 3));
num <<= 2;
num |= (wcwidthBMP(j + 2));
num <<= 2;
num |= (wcwidthBMP(j + 1));
num <<= 2;
num |= (wcwidthBMP(j));
table[i] = num;
}
if (bisearch(ucs, COMBINING_HIGH))
return 0;
if ((ucs >= 0x20000 && ucs <= 0x2fffd) || (ucs >= 0x30000 && ucs <= 0x3fffd)) {
return 2;
}
return 1;
}
// 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;
const 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;
}
// get width from lookup table for num < 65536:
// 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
// ==> n = n & 3 e.g. 000000000000000000000000000000XX
return function (num) {
num = num | 0;
return (num < 65536) ? (table[num >> 2] >> ((num & 3) * 2)) & 3 : wcwidthHigh(num);
num = num | 0; // get asm.js like optimization under V8
if (num < 32)
return opts.control;
else if (num < 127)
return 1;
else if (num < 65536)
return table[num >> 4] >> ((num & 15) << 1) & 3;
// do a full search for high codepoints
else return wcwidthHigh(num);
};
})({nul: 0, control: 0}); // configurable options

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