[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(b) {
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| 6 | if ((b & 0xc0) === 0x80) {
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| 7 | return b & 0x3f;
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| 8 | } else {
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| 9 | throw new Error("invalid UTF-8 encoding");
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| 10 | }
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| 11 | }
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| 12 |
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| 13 | function code(min, n) {
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| 14 | if (n < min || 0xd800 <= n && n < 0xe000 || n >= 0x10000) {
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| 15 | throw new Error("invalid UTF-8 encoding");
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| 16 | } else {
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| 17 | return n;
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| 18 | }
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| 19 | }
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| 20 |
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| 21 | export function decode(bytes) {
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| 22 | return _decode(bytes).map(function (x) {
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| 23 | return String.fromCharCode(x);
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| 24 | }).join("");
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| 25 | }
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| 26 |
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| 27 | function _decode(bytes) {
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| 28 | if (bytes.length === 0) {
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| 29 | return [];
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| 30 | }
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| 31 | /**
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| 32 | * 1 byte
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| 33 | */
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| 34 |
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| 35 |
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| 36 | {
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| 37 | var _bytes = _toArray(bytes),
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| 38 | b1 = _bytes[0],
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| 39 | bs = _bytes.slice(1);
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| 40 |
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| 41 | if (b1 < 0x80) {
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| 42 | return [code(0x0, b1)].concat(_toConsumableArray(_decode(bs)));
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| 43 | }
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| 44 |
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| 45 | if (b1 < 0xc0) {
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| 46 | throw new Error("invalid UTF-8 encoding");
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| 47 | }
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| 48 | }
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| 49 | /**
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| 50 | * 2 bytes
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| 51 | */
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| 52 |
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| 53 | {
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| 54 | var _bytes2 = _toArray(bytes),
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| 55 | _b = _bytes2[0],
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| 56 | b2 = _bytes2[1],
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| 57 | _bs = _bytes2.slice(2);
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| 58 |
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| 59 | if (_b < 0xe0) {
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| 60 | return [code(0x80, ((_b & 0x1f) << 6) + con(b2))].concat(_toConsumableArray(_decode(_bs)));
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| 61 | }
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| 62 | }
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| 63 | /**
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| 64 | * 3 bytes
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| 65 | */
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| 66 |
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| 67 | {
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| 68 | var _bytes3 = _toArray(bytes),
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| 69 | _b2 = _bytes3[0],
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| 70 | _b3 = _bytes3[1],
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| 71 | b3 = _bytes3[2],
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| 72 | _bs2 = _bytes3.slice(3);
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| 73 |
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| 74 | if (_b2 < 0xf0) {
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| 75 | return [code(0x800, ((_b2 & 0x0f) << 12) + (con(_b3) << 6) + con(b3))].concat(_toConsumableArray(_decode(_bs2)));
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| 76 | }
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| 77 | }
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| 78 | /**
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| 79 | * 4 bytes
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| 80 | */
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| 81 |
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| 82 | {
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| 83 | var _bytes4 = _toArray(bytes),
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| 84 | _b4 = _bytes4[0],
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| 85 | _b5 = _bytes4[1],
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| 86 | _b6 = _bytes4[2],
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| 87 | b4 = _bytes4[3],
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| 88 | _bs3 = _bytes4.slice(4);
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| 89 |
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| 90 | if (_b4 < 0xf8) {
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| 91 | return [code(0x10000, (((_b4 & 0x07) << 18) + con(_b5) << 12) + (con(_b6) << 6) + con(b4))].concat(_toConsumableArray(_decode(_bs3)));
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| 92 | }
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| 93 | }
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| 94 | throw new Error("invalid UTF-8 encoding");
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| 95 | } |
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