53 lines
1.2 KiB
JavaScript
53 lines
1.2 KiB
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports.encode = encode;
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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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function _toArray(arr) { return Array.isArray(arr) ? arr : Array.from(arr); }
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function con(n) {
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return 0x80 | n & 0x3f;
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}
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function encode(str) {
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var arr = str.split("").map(function (x) {
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return x.charCodeAt(0);
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});
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return _encode(arr);
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}
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function _encode(arr) {
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if (arr.length === 0) {
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return [];
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}
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var _arr = _toArray(arr),
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n = _arr[0],
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ns = _arr.slice(1);
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if (n < 0) {
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throw new Error("utf8");
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}
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if (n < 0x80) {
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return [n].concat(_toConsumableArray(_encode(ns)));
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}
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if (n < 0x800) {
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return [0xc0 | n >>> 6, con(n)].concat(_toConsumableArray(_encode(ns)));
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}
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if (n < 0x10000) {
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return [0xe0 | n >>> 12, con(n >>> 6), con(n)].concat(_toConsumableArray(_encode(ns)));
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}
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if (n < 0x110000) {
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return [0xf0 | n >>> 18, con(n >>> 12), con(n >>> 6), con(n)].concat(_toConsumableArray(_encode(ns)));
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}
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throw new Error("utf8");
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} |