/* @flow */
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import type VNode from 'core/vdom/vnode'
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/**
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* Runtime helper for resolving raw children VNodes into a slot object.
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*/
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export function resolveSlots (
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children: ?Array<VNode>,
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context: ?Component
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): { [key: string]: Array<VNode> } {
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if (!children || !children.length) {
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return {}
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}
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const slots = {}
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for (let i = 0, l = children.length; i < l; i++) {
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const child = children[i]
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const data = child.data
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// remove slot attribute if the node is resolved as a Vue slot node
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if (data && data.attrs && data.attrs.slot) {
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delete data.attrs.slot
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}
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// named slots should only be respected if the vnode was rendered in the
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// same context.
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if ((child.context === context || child.fnContext === context) &&
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data && data.slot != null
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) {
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const name = data.slot
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const slot = (slots[name] || (slots[name] = []))
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if (child.tag === 'template') {
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slot.push.apply(slot, child.children || [])
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} else {
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slot.push(child)
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}
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} else {
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(slots.default || (slots.default = [])).push(child)
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}
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}
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// ignore slots that contains only whitespace
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for (const name in slots) {
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if (slots[name].every(isWhitespace)) {
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delete slots[name]
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}
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}
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return slots
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}
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function isWhitespace (node: VNode): boolean {
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return (node.isComment && !node.asyncFactory) || node.text === ' '
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}
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