lang.js
791 Bytes
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
/* @flow */
/**
* Check if a string starts with $ or _
*/
export function isReserved (str: string): boolean {
const c = (str + '').charCodeAt(0)
return c === 0x24 || c === 0x5F
}
/**
* Define a property.
*/
export function def (obj: Object, key: string, val: any, enumerable?: boolean) {
Object.defineProperty(obj, key, {
value: val,
enumerable: !!enumerable,
writable: true,
configurable: true
})
}
/**
* Parse simple path.
*/
const bailRE = /[^\w.$]/
export function parsePath (path: string): any {
if (bailRE.test(path)) {
return
} else {
const segments = path.split('.')
return function (obj) {
for (let i = 0; i < segments.length; i++) {
if (!obj) return
obj = obj[segments[i]]
}
return obj
}
}
}