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); } }
|
2
|
|
3
|
function _toArray(arr) { return Array.isArray(arr) ? arr : Array.from(arr); }
|
4
|
|
5
|
function con(n) {
|
6
|
return 0x80 | n & 0x3f;
|
7
|
}
|
8
|
|
9
|
export function encode(str) {
|
10
|
var arr = str.split("").map(function (x) {
|
11
|
return x.charCodeAt(0);
|
12
|
});
|
13
|
return _encode(arr);
|
14
|
}
|
15
|
|
16
|
function _encode(arr) {
|
17
|
if (arr.length === 0) {
|
18
|
return [];
|
19
|
}
|
20
|
|
21
|
var _arr = _toArray(arr),
|
22
|
n = _arr[0],
|
23
|
ns = _arr.slice(1);
|
24
|
|
25
|
if (n < 0) {
|
26
|
throw new Error("utf8");
|
27
|
}
|
28
|
|
29
|
if (n < 0x80) {
|
30
|
return [n].concat(_toConsumableArray(_encode(ns)));
|
31
|
}
|
32
|
|
33
|
if (n < 0x800) {
|
34
|
return [0xc0 | n >>> 6, con(n)].concat(_toConsumableArray(_encode(ns)));
|
35
|
}
|
36
|
|
37
|
if (n < 0x10000) {
|
38
|
return [0xe0 | n >>> 12, con(n >>> 6), con(n)].concat(_toConsumableArray(_encode(ns)));
|
39
|
}
|
40
|
|
41
|
if (n < 0x110000) {
|
42
|
return [0xf0 | n >>> 18, con(n >>> 12), con(n >>> 6), con(n)].concat(_toConsumableArray(_encode(ns)));
|
43
|
}
|
44
|
|
45
|
throw new Error("utf8");
|
46
|
}
|