Last change
on this file since 84d0fbb was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago |
initial commit
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Property mode
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100644
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File size:
1.1 KB
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[6a3a178] | 1 | function _toConsumableArray(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } else { return Array.from(arr); } }
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| 2 |
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| 3 | function _toArray(arr) { return Array.isArray(arr) ? arr : Array.from(arr); }
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| 4 |
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| 5 | function con(n) {
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| 6 | return 0x80 | n & 0x3f;
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| 7 | }
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| 8 |
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| 9 | export function encode(str) {
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| 10 | var arr = str.split("").map(function (x) {
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| 11 | return x.charCodeAt(0);
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| 12 | });
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| 13 | return _encode(arr);
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| 14 | }
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| 15 |
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| 16 | function _encode(arr) {
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| 17 | if (arr.length === 0) {
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| 18 | return [];
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| 19 | }
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| 20 |
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| 21 | var _arr = _toArray(arr),
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| 22 | n = _arr[0],
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| 23 | ns = _arr.slice(1);
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| 24 |
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| 25 | if (n < 0) {
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| 26 | throw new Error("utf8");
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| 27 | }
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| 28 |
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| 29 | if (n < 0x80) {
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| 30 | return [n].concat(_toConsumableArray(_encode(ns)));
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| 31 | }
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| 32 |
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| 33 | if (n < 0x800) {
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| 34 | return [0xc0 | n >>> 6, con(n)].concat(_toConsumableArray(_encode(ns)));
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| 35 | }
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| 36 |
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| 37 | if (n < 0x10000) {
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| 38 | return [0xe0 | n >>> 12, con(n >>> 6), con(n)].concat(_toConsumableArray(_encode(ns)));
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| 39 | }
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| 40 |
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| 41 | if (n < 0x110000) {
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| 42 | return [0xf0 | n >>> 18, con(n >>> 12), con(n >>> 6), con(n)].concat(_toConsumableArray(_encode(ns)));
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| 43 | }
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| 44 |
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| 45 | throw new Error("utf8");
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| 46 | } |
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