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* Copyright 2020 Adobe. All rights reserved.\n * This file is licensed to you under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License. You may obtain a copy\n * of the License at http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software distributed under\n * the License is distributed on an \"AS IS\" BASIS, WITHOUT WARRANTIES OR REPRESENTATIONS\n * OF ANY KIND, either express or implied. See the License for the specific language\n * governing permissions and limitations under the License.\n */\n\nimport {CollectionBase, CollectionElement, Key, Node} from '@react-types/shared';\nimport {PartialNode} from './types';\nimport React, {ReactElement} from 'react';\n\ninterface CollectionBuilderState {\n renderer?: (value: any) => ReactElement | null\n}\n\ninterface CollectReactElement<T> extends ReactElement {\n getCollectionNode(props: any, context: any): Generator<PartialNode<T>, void, Node<T>[]>\n}\n\nexport class CollectionBuilder<T extends object> {\n private context?: unknown;\n private cache: WeakMap<T, Node<T>> = new WeakMap();\n\n build(props: Partial<CollectionBase<T>>, context?: unknown) {\n this.context = context;\n return iterable(() => this.iterateCollection(props));\n }\n\n private *iterateCollection(props: Partial<CollectionBase<T>>): Generator<Node<T>> {\n let {children, items} = props;\n\n if (React.isValidElement<{children: CollectionElement<T>}>(children) && children.type === React.Fragment) {\n yield* this.iterateCollection({\n children: children.props.children,\n items\n });\n } else if (typeof children === 'function') {\n if (!items) {\n throw new Error('props.children was a function but props.items is missing');\n }\n\n let index = 0;\n for (let item of items) {\n yield* this.getFullNode({\n value: item,\n index\n }, {renderer: children});\n index++;\n }\n } else {\n let items: CollectionElement<T>[] = [];\n React.Children.forEach(children, child => {\n if (child) {\n items.push(child);\n }\n });\n\n let index = 0;\n for (let item of items) {\n let nodes = this.getFullNode({\n element: item,\n index: index\n }, {});\n\n for (let node of nodes) {\n index++;\n yield node;\n }\n }\n }\n }\n\n private getKey(item: NonNullable<CollectionElement<T>>, partialNode: PartialNode<T>, state: CollectionBuilderState, parentKey?: Key | null): Key {\n if (item.key != null) {\n return item.key;\n }\n\n if (partialNode.type === 'cell' && partialNode.key != null) {\n return `${parentKey}${partialNode.key}`;\n }\n\n let v = partialNode.value as any;\n if (v != null) {\n let key = v.key ?? v.id;\n if (key == null) {\n throw new Error('No key found for item');\n }\n\n return key;\n }\n\n return parentKey ? `${parentKey}.${partialNode.index}` : `$.${partialNode.index}`;\n }\n\n private getChildState(state: CollectionBuilderState, partialNode: PartialNode<T>) {\n return {\n renderer: partialNode.renderer || state.renderer\n };\n }\n\n private *getFullNode(partialNode: PartialNode<T> & {index: number}, state: CollectionBuilderState, parentKey?: Key | null, parentNode?: Node<T>): Generator<Node<T>> {\n if (React.isValidElement<{children: CollectionElement<T>}>(partialNode.element) && partialNode.element.type === React.Fragment) {\n let children: CollectionElement<T>[] = [];\n\n React.Children.forEach(partialNode.element.props.children, child => {\n children.push(child);\n });\n\n let index = partialNode.index ?? 0;\n\n for (const child of children) {\n yield* this.getFullNode({\n element: child,\n index: index++\n }, state, parentKey, parentNode);\n }\n\n return;\n }\n\n // If there's a value instead of an element on the node, and a parent renderer function is available,\n // use it to render an element for the value.\n let element = partialNode.element;\n if (!element && partialNode.value && state && state.renderer) {\n let cached = this.cache.get(partialNode.value);\n if (cached && (!cached.shouldInvalidate || !cached.shouldInvalidate(this.context))) {\n cached.index = partialNode.index;\n cached.parentKey = parentNode ? parentNode.key : null;\n yield cached;\n return;\n }\n\n element = state.renderer(partialNode.value);\n }\n\n // If there's an element with a getCollectionNode function on its type, then it's a supported component.\n // Call this function to get a partial node, and recursively build a full node from there.\n if (React.isValidElement(element)) {\n let type = element.type as unknown as CollectReactElement<T>;\n if (typeof type !== 'function' && typeof type.getCollectionNode !== 'function') {\n let name = element.type;\n throw new Error(`Unknown element <${name}> in collection.`);\n }\n\n let childNodes = type.getCollectionNode(element.props, this.context) as Generator<PartialNode<T>, void, Node<T>[]>;\n let index = partialNode.index ?? 0;\n let result = childNodes.next();\n while (!result.done && result.value) {\n let childNode = result.value;\n\n partialNode.index = index;\n\n let nodeKey = childNode.key ?? null;\n if (nodeKey == null) {\n nodeKey = childNode.element ? null : this.getKey(element as NonNullable<CollectionElement<T>>, partialNode, state, parentKey);\n }\n\n let nodes = this.getFullNode({\n ...childNode,\n key: nodeKey,\n index,\n wrapper: compose(partialNode.wrapper, childNode.wrapper)\n }, this.getChildState(state, childNode), parentKey ? `${parentKey}${element.key}` : element.key, parentNode);\n\n let children = [...nodes];\n for (let node of children) {\n // Cache the node based on its value\n node.value = childNode.value ?? partialNode.value ?? null;\n if (node.value) {\n this.cache.set(node.value, node);\n }\n\n // The partial node may have specified a type for the child in order to specify a constraint.\n // Verify that the full node that was built recursively matches this type.\n if (partialNode.type && node.type !== partialNode.type) {\n throw new Error(`Unsupported type <${capitalize(node.type)}> in <${capitalize(parentNode?.type ?? 'unknown parent type')}>. Only <${capitalize(partialNode.type)}> is supported.`);\n }\n\n index++;\n yield node;\n }\n\n result = childNodes.next(children);\n }\n\n return;\n }\n\n // Ignore invalid elements\n if (partialNode.key == null || partialNode.type == null) {\n return;\n }\n\n // Create full node\n let builder = this;\n let node: Node<T> = {\n type: partialNode.type,\n props: partialNode.props,\n key: partialNode.key,\n parentKey: parentNode ? parentNode.key : null,\n value: partialNode.value ?? null,\n level: parentNode ? parentNode.level + 1 : 0,\n index: partialNode.index,\n rendered: partialNode.rendered,\n textValue: partialNode.textValue ?? '',\n 'aria-label': partialNode['aria-label'],\n wrapper: partialNode.wrapper,\n shouldInvalidate: partialNode.shouldInvalidate,\n hasChildNodes: partialNode.hasChildNodes || false,\n childNodes: iterable(function *() {\n if (!partialNode.hasChildNodes || !partialNode.childNodes) {\n return;\n }\n\n let index = 0;\n for (let child of partialNode.childNodes()) {\n // Ensure child keys are globally unique by prepending the parent node's key\n if (child.key != null) {\n // TODO: Remove this line entirely and enforce that users always provide unique keys.\n // Currently this line will have issues when a parent has a key `a` and a child with key `bc`\n // but another parent has key `ab` and its child has a key `c`. The combined keys would result in both\n // children having a key of `abc`.\n child.key = `${node.key}${child.key}`;\n }\n\n let nodes = builder.getFullNode({...child, index}, builder.getChildState(state, child), node.key, node);\n for (let node of nodes) {\n index++;\n yield node;\n }\n }\n })\n };\n\n yield node;\n }\n}\n\n// Wraps an iterator function as an iterable object, and caches the results.\nfunction iterable<T>(iterator: () => IterableIterator<Node<T>>): Iterable<Node<T>> {\n let cache: Array<Node<T>> = [];\n let iterable: null | IterableIterator<Node<T>> = null;\n return {\n *[Symbol.iterator]() {\n for (let item of cache) {\n yield item;\n }\n\n if (!iterable) {\n iterable = iterator();\n }\n\n for (let item of iterable) {\n cache.push(item);\n yield item;\n }\n }\n };\n}\n\ntype Wrapper = (element: ReactElement) => ReactElement;\nfunction compose(outer: Wrapper | void, inner: Wrapper | void): Wrapper | undefined {\n if (outer && inner) {\n return (element) => outer(inner(element));\n }\n\n if (outer) {\n return outer;\n }\n\n if (inner) {\n return inner;\n }\n}\n\nfunction capitalize(str: string) {\n return str[0].toUpperCase() + str.slice(1);\n}\n"],"names":[],"version":3,"file":"CollectionBuilder.main.js.map"} |