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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); } }
- function _toArray(arr) { return Array.isArray(arr) ? arr : Array.from(arr); }
- function con(b) {
- if ((b & 0xc0) === 0x80) {
- return b & 0x3f;
- } else {
- throw new Error("invalid UTF-8 encoding");
- }
- }
- function code(min, n) {
- if (n < min || 0xd800 <= n && n < 0xe000 || n >= 0x10000) {
- throw new Error("invalid UTF-8 encoding");
- } else {
- return n;
- }
- }
- export function decode(bytes) {
- return _decode(bytes).map(function (x) {
- return String.fromCharCode(x);
- }).join("");
- }
- function _decode(bytes) {
- if (bytes.length === 0) {
- return [];
- }
- /**
- * 1 byte
- */
- {
- var _bytes = _toArray(bytes),
- b1 = _bytes[0],
- bs = _bytes.slice(1);
- if (b1 < 0x80) {
- return [code(0x0, b1)].concat(_toConsumableArray(_decode(bs)));
- }
- if (b1 < 0xc0) {
- throw new Error("invalid UTF-8 encoding");
- }
- }
- /**
- * 2 bytes
- */
- {
- var _bytes2 = _toArray(bytes),
- _b = _bytes2[0],
- b2 = _bytes2[1],
- _bs = _bytes2.slice(2);
- if (_b < 0xe0) {
- return [code(0x80, ((_b & 0x1f) << 6) + con(b2))].concat(_toConsumableArray(_decode(_bs)));
- }
- }
- /**
- * 3 bytes
- */
- {
- var _bytes3 = _toArray(bytes),
- _b2 = _bytes3[0],
- _b3 = _bytes3[1],
- b3 = _bytes3[2],
- _bs2 = _bytes3.slice(3);
- if (_b2 < 0xf0) {
- return [code(0x800, ((_b2 & 0x0f) << 12) + (con(_b3) << 6) + con(b3))].concat(_toConsumableArray(_decode(_bs2)));
- }
- }
- /**
- * 4 bytes
- */
- {
- var _bytes4 = _toArray(bytes),
- _b4 = _bytes4[0],
- _b5 = _bytes4[1],
- _b6 = _bytes4[2],
- b4 = _bytes4[3],
- _bs3 = _bytes4.slice(4);
- if (_b4 < 0xf8) {
- return [code(0x10000, (((_b4 & 0x07) << 18) + con(_b5) << 12) + (con(_b6) << 6) + con(b4))].concat(_toConsumableArray(_decode(_bs3)));
- }
- }
- throw new Error("invalid UTF-8 encoding");
- }
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