/* @flow */
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import { isObject, isDef, hasSymbol } from 'core/util/index'
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/**
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* Runtime helper for rendering v-for lists.
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*/
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export function renderList (
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val: any,
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render: (
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val: any,
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keyOrIndex: string | number,
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index?: number
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) => VNode
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): ?Array<VNode> {
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let ret: ?Array<VNode>, i, l, keys, key
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if (Array.isArray(val) || typeof val === 'string') {
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ret = new Array(val.length)
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for (i = 0, l = val.length; i < l; i++) {
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ret[i] = render(val[i], i)
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}
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} else if (typeof val === 'number') {
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ret = new Array(val)
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for (i = 0; i < val; i++) {
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ret[i] = render(i + 1, i)
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}
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} else if (isObject(val)) {
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if (hasSymbol && val[Symbol.iterator]) {
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ret = []
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const iterator: Iterator<any> = val[Symbol.iterator]()
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let result = iterator.next()
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while (!result.done) {
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ret.push(render(result.value, ret.length))
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result = iterator.next()
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}
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} else {
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keys = Object.keys(val)
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ret = new Array(keys.length)
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for (i = 0, l = keys.length; i < l; i++) {
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key = keys[i]
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ret[i] = render(val[key], key, i)
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}
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}
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}
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if (!isDef(ret)) {
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ret = []
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}
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(ret: any)._isVList = true
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return ret
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}
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