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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// 默认配置
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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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// 获取配置。 Object.assign 从一个或多个源对象复制到目标对象
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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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// 列表中的树
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export function 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 function 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 function 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 function 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 function findPath<T = any>(
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tree: any,
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func: Fn,
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config: Partial<TreeHelperConfig> = {},
|
): 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 function 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;
|
while (list.length) {
|
const node = list[0];
|
if (visitedSet.has(node)) {
|
path.pop();
|
list.shift();
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} else {
|
visitedSet.add(node);
|
node[children!] && list.unshift(...node[children!]);
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path.push(node);
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func(node) && result.push([...path]);
|
}
|
}
|
return result;
|
}
|
|
export function filter<T = any>(
|
tree: T[],
|
func: (n: T) => boolean,
|
// Partial 将 T 中的所有属性设为可选
|
config: Partial<TreeHelperConfig> = {},
|
): T[] {
|
// 获取配置
|
config = getConfig(config);
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const children = config.children as string;
|
|
function listFilter(list: T[]) {
|
return list
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.map((node: any) => ({ ...node }))
|
.filter((node) => {
|
// 递归调用 对含有children项 进行再次调用自身函数 listFilter
|
node[children] = node[children] && listFilter(node[children]);
|
// 执行传入的回调 func 进行过滤
|
return func(node) || (node[children] && node[children].length);
|
});
|
}
|
|
return listFilter(tree);
|
}
|
|
export function forEach<T = any>(
|
tree: T[],
|
func: (n: T) => any,
|
config: Partial<TreeHelperConfig> = {},
|
): void {
|
config = getConfig(config);
|
const list: any[] = [...tree];
|
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
|
* @description: 提取树指定结构
|
*/
|
export function treeMap<T = any>(treeData: T[], opt: { children?: string; conversion: Fn }): T[] {
|
return treeData.map((item) => treeMapEach(item, opt));
|
}
|
|
/**
|
* @description: Extract tree specified structure
|
* @description: 提取树指定结构
|
*/
|
export function 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 function eachTree(treeDatas: any[], callBack: Fn, parentNode = {}) {
|
treeDatas.forEach((element) => {
|
const newNode = callBack(element, parentNode) || element;
|
if (element.children) {
|
eachTree(element.children, callBack, newNode);
|
}
|
});
|
}
|
