A suite to track Project Diva score statistics and ratings / D4DJ event data.
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projectdivar/server/node_modules/pick-by-alias/index.js

77 lines
1.3 KiB

'use strict'
module.exports = function pick (src, props, keepRest) {
var result = {}, prop, i
if (typeof props === 'string') props = toList(props)
if (Array.isArray(props)) {
var res = {}
for (i = 0; i < props.length; i++) {
res[props[i]] = true
}
props = res
}
// convert strings to lists
for (prop in props) {
props[prop] = toList(props[prop])
}
// keep-rest strategy requires unmatched props to be preserved
var occupied = {}
for (prop in props) {
var aliases = props[prop]
if (Array.isArray(aliases)) {
for (i = 0; i < aliases.length; i++) {
var alias = aliases[i]
if (keepRest) {
occupied[alias] = true
}
if (alias in src) {
result[prop] = src[alias]
if (keepRest) {
for (var j = i; j < aliases.length; j++) {
occupied[aliases[j]] = true
}
}
break
}
}
}
else if (prop in src) {
if (props[prop]) {
result[prop] = src[prop]
}
if (keepRest) {
occupied[prop] = true
}
}
}
if (keepRest) {
for (prop in src) {
if (occupied[prop]) continue
result[prop] = src[prop]
}
}
return result
}
var CACHE = {}
function toList(arg) {
if (CACHE[arg]) return CACHE[arg]
if (typeof arg === 'string') {
arg = CACHE[arg] = arg.split(/\s*,\s*|\s+/)
}
return arg
}