32 lines
866 B
JavaScript
32 lines
866 B
JavaScript
const reserved = require('./reserved.js')
|
|
|
|
// from https://werxltd.com/wp/2010/05/13/javascript-implementation-of-javas-string-hashcode-method/
|
|
function hashCode(str) {
|
|
let hash = 0
|
|
for (let i = 0; i < str.length; ++i) {
|
|
const char = str.charCodeAt(i)
|
|
hash = (hash << 5) - hash + char
|
|
hash |= 0 // Convert to 32bit integer
|
|
}
|
|
return hash
|
|
}
|
|
|
|
function identifier(key, unique) {
|
|
if (unique) key += ' ' + hashCode(key).toString(36)
|
|
const id = key.trim().replace(/\W+/g, '_')
|
|
return reserved.ES3[id] || reserved.ESnext[id] || /^\d/.test(id)
|
|
? '_' + id
|
|
: id
|
|
}
|
|
|
|
function property(obj, key) {
|
|
if (/^[A-Z_$][0-9A-Z_$]*$/i.test(key) && !reserved.ES3[key]) {
|
|
return obj ? obj + '.' + key : key
|
|
} else {
|
|
const jkey = JSON.stringify(key)
|
|
return obj ? obj + '[' + jkey + ']' : jkey
|
|
}
|
|
}
|
|
|
|
module.exports = { identifier, property }
|