interface TreeHelperConfig {
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id: string
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children: string
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pid: string
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}
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const DEFAULT_CONFIG: TreeHelperConfig = {
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id: 'id',
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children: 'children',
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pid: 'pid'
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}
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const getConfig = (config: Partial<TreeHelperConfig>) => Object.assign({}, DEFAULT_CONFIG, config)
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// tree from list
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export const listToTree = <T = any>(list: any[], config: Partial<TreeHelperConfig> = {}): T[] => {
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const conf = getConfig(config) as TreeHelperConfig
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const nodeMap = new Map()
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const result: T[] = []
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const { id, children, pid } = conf
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for (const node of list) {
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node[children] = node[children] || []
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nodeMap.set(node[id], node)
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}
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for (const node of list) {
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const parent = nodeMap.get(node[pid])
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;(parent ? parent.children : result).push(node)
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}
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return result
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}
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export const treeToList = <T = any>(tree: any, config: Partial<TreeHelperConfig> = {}): T => {
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config = getConfig(config)
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const { children } = config
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const result: any = [...tree]
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for (let i = 0; i < result.length; i++) {
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if (!result[i][children!]) continue
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result.splice(i + 1, 0, ...result[i][children!])
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}
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return result
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}
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export const findNode = <T = any>(
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tree: any,
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func: Fn,
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config: Partial<TreeHelperConfig> = {}
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): T | null => {
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config = getConfig(config)
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const { children } = config
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const list = [...tree]
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for (const node of list) {
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if (func(node)) return node
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node[children!] && list.push(...node[children!])
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}
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return null
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}
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export const findNodeAll = <T = any>(
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tree: any,
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func: Fn,
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config: Partial<TreeHelperConfig> = {}
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): T[] => {
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config = getConfig(config)
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const { children } = config
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const list = [...tree]
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const result: T[] = []
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for (const node of list) {
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func(node) && result.push(node)
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node[children!] && list.push(...node[children!])
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}
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return result
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}
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export const findPath = <T = any>(
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tree: any,
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func: Fn,
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config: Partial<TreeHelperConfig> = {}
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): T | T[] | null => {
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config = getConfig(config)
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const path: T[] = []
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const list = [...tree]
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const visitedSet = new Set()
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const { children } = config
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while (list.length) {
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const node = list[0]
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if (visitedSet.has(node)) {
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path.pop()
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list.shift()
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} else {
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visitedSet.add(node)
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node[children!] && list.unshift(...node[children!])
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path.push(node)
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if (func(node)) {
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return path
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}
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}
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}
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return null
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}
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export const findPathAll = (tree: any, func: Fn, config: Partial<TreeHelperConfig> = {}) => {
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config = getConfig(config)
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const path: any[] = []
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const list = [...tree]
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const result: any[] = []
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const visitedSet = new Set(),
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{ children } = config
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while (list.length) {
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const node = list[0]
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if (visitedSet.has(node)) {
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path.pop()
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list.shift()
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} else {
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visitedSet.add(node)
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node[children!] && list.unshift(...node[children!])
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path.push(node)
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func(node) && result.push([...path])
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}
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}
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return result
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}
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export const filter = <T = any>(
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tree: T[],
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func: (n: T) => boolean,
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config: Partial<TreeHelperConfig> = {}
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): T[] => {
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config = getConfig(config)
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const children = config.children as string
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function listFilter(list: T[]) {
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return list
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.map((node: any) => ({ ...node }))
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.filter((node) => {
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node[children] = node[children] && listFilter(node[children])
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return func(node) || (node[children] && node[children].length)
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})
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}
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return listFilter(tree)
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}
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export const forEach = <T = any>(
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tree: T[],
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func: (n: T) => any,
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config: Partial<TreeHelperConfig> = {}
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): void => {
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config = getConfig(config)
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const list: any[] = [...tree]
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const { children } = config
|
for (let i = 0; i < list.length; i++) {
|
// func 返回true就终止遍历，避免大量节点场景下无意义循环，引起浏览器卡顿
|
if (func(list[i])) {
|
return
|
}
|
children && list[i][children] && list.splice(i + 1, 0, ...list[i][children])
|
}
|
}
|
|
/**
|
* @description: Extract tree specified structure
|
*/
|
export const treeMap = <T = any>(
|
treeData: T[],
|
opt: { children?: string; conversion: Fn }
|
): T[] => {
|
return treeData.map((item) => treeMapEach(item, opt))
|
}
|
|
/**
|
* @description: Extract tree specified structure
|
*/
|
export const treeMapEach = (
|
data: any,
|
{ children = 'children', conversion }: { children?: string; conversion: Fn }
|
) => {
|
const haveChildren = Array.isArray(data[children]) && data[children].length > 0
|
const conversionData = conversion(data) || {}
|
if (haveChildren) {
|
return {
|
...conversionData,
|
[children]: data[children].map((i: number) =>
|
treeMapEach(i, {
|
children,
|
conversion
|
})
|
)
|
}
|
} else {
|
return {
|
...conversionData
|
}
|
}
|
}
|
|
/**
|
* 递归遍历树结构
|
* @param treeDatas 树
|
* @param callBack 回调
|
* @param parentNode 父节点
|
*/
|
export const eachTree = (treeDatas: any[], callBack: Fn, parentNode = {}) => {
|
treeDatas.forEach((element) => {
|
const newNode = callBack(element, parentNode) || element
|
if (element.children) {
|
eachTree(element.children, callBack, newNode)
|
}
|
})
|
}
|
