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