@httpx/treeu/dist/index.js

Tree utilities

//#region src/mapper/flat-tree-ws-mapper.ts
const sym = Symbol("@@result");
const flatTreeWsMapperErrors = {
	toTreeNodes: {
		parsedErrorMsg: `Can't convert the flat tree to tree nodes`,
		issues: {
			ARG_NOT_ARRAY: "Invalid argument: not an array (FlatTreeWs)",
			ARG_NOT_OBJECT_ARRAY: "Invalid argument: not an array of objects (FlatTreeWs)",
			NON_STRING_KEY: "Non-string key",
			EMPTY_KEY: "Empty key given",
			SPLIT_EMPTY_KEY: "Split an empty key"
		}
	},
	fromTreeNodes: {
		parsedErrorMsg: `Can't convert the tree to tree nodes to flat with separator`,
		issues: {
			DUPLICATE_KEY: "Duplicate unique id",
			INVALID_KEY: "Invalid key found"
		}
	}
};
var FlatTreeWsMapper = class {
	toTreeNodes = (data, params) => {
		const { separator } = params;
		const collector = { [sym]: [] };
		const d = data instanceof Map ? data : new Map(Object.entries(data));
		try {
			for (const [key, value] of d) {
				const trimmedKey = key.trim();
				if (trimmedKey.length === 0) throw new Error(`${flatTreeWsMapperErrors.toTreeNodes.issues.EMPTY_KEY}`);
				let context = collector;
				const splitted = trimmedKey.split(separator);
				for (const name of splitted) {
					if (name.trim().length === 0) throw new Error(`${flatTreeWsMapperErrors.toTreeNodes.issues.SPLIT_EMPTY_KEY}`);
					if (!Object.hasOwn(context, name)) {
						Object.defineProperty(context, name, {
							value: { [sym]: [] },
							writable: false
						});
						const parents = splitted.slice(0, -1);
						const node = {
							id: trimmedKey,
							parentId: parents.length > 0 ? parents.join(separator) : null,
							children: context[name][sym]
						};
						if (value !== void 0) node.value = value;
						if (!Array.isArray(context[sym])) throw new TypeError(JSON.stringify(node));
						context[sym].push(node);
					}
					context = context[name];
				}
			}
		} catch (e) {
			return {
				success: false,
				message: flatTreeWsMapperErrors.toTreeNodes.parsedErrorMsg,
				issues: [{ message: `${e.message}` }]
			};
		}
		return {
			success: true,
			treeNodes: collector[sym]
		};
	};
	/**
	* @throws Error
	*/
	toTreeNodesOrThrow = (data, params) => {
		const result = this.toTreeNodes(data, params);
		if (!result.success) {
			const { message, issues } = result;
			const errors = issues.length > 0 ? issues.map((issue) => issue.message).join(", ") : null;
			throw new Error(`${message} (${errors})`);
		}
		return result.treeNodes;
	};
	/**
	* Will convert a tree of nodes to a flat tree.
	*/
	fromTreeNodesOrThrow = (treeNodes, params) => {
		const result = [];
		const queue = [];
		treeNodes.forEach((node) => queue.push(node));
		while (true) {
			let count = queue.length;
			if (count === 0) break;
			while (count > 0) {
				const node = queue.shift();
				result.push(node);
				node.children?.forEach((child) => queue.push(child));
				count--;
			}
		}
		const map = /* @__PURE__ */ new Map();
		const { parsedErrorMsg, issues } = flatTreeWsMapperErrors.fromTreeNodes;
		for (const node of result) {
			const key = node.id;
			if (typeof key !== "string" && typeof key !== "number") throw new TypeError(`${parsedErrorMsg} (${issues.INVALID_KEY}: '${key}')`);
			if (map.has(key)) throw new Error(`${parsedErrorMsg} (${issues.DUPLICATE_KEY}: '${key}' of type ${typeof key}')`);
			map.set(key, node.value);
		}
		return map;
	};
};
//#endregion
//#region src/search/dfs-tree-search.ts
/**
* Depth-First Search (DFS) algorithm for tree structures. It uses a stack rather
* than recursion in order to support deeply nested trees without call-stack overflows.
* It is well suited for exploring a branch of a data structure in depth and
* usually preferred when memory usage is a concern or when the data
* structure has many nodes with few levels.
*
* @see https://hackernoon.com/a-beginners-guide-to-bfs-and-dfs-in-javascript
*/
var DfsTreeSearch = class {
	treeNodes;
	constructor(treeNodes) {
		this.treeNodes = treeNodes;
	}
	/**
	* Find first matching node in the tree. The `reverse` parameter can be used
	* to traverse the tree in reverse order.
	*/
	findOne = (idOrConditionOrFn, params) => {
		const { includeChildren = false, reverse = false } = { ...params };
		if (!Array.isArray(this.treeNodes) || this.treeNodes.length === 0) return;
		let result;
		const isIdSearch = typeof idOrConditionOrFn === "string" || typeof idOrConditionOrFn === "number";
		const isFnSearch = !Array.isArray(idOrConditionOrFn);
		for (const treeNode of this.treeNodes) {
			const stack = [treeNode];
			while (stack.length > 0) {
				const node = stack[reverse ? "pop" : "shift"]();
				if (isIdSearch ? node.id === idOrConditionOrFn : isFnSearch ? idOrConditionOrFn(node) : idOrConditionOrFn[0] in node && node[idOrConditionOrFn[0]] === idOrConditionOrFn[2]) {
					result = node;
					break;
				}
				if (node.children) stack.push(...node.children);
			}
			if (result) break;
		}
		if (includeChildren !== true) {
			const { children: _children, ...rest } = result ?? {};
			return { ...rest };
		}
		return result;
	};
};
//#endregion
//#region src/tree.ts
var Tree = class {
	treeNodes;
	constructor(treeNodes) {
		this.treeNodes = treeNodes;
	}
	getTreeNodes = () => {
		return this.treeNodes;
	};
};
//#endregion
export { DfsTreeSearch, FlatTreeWsMapper, Tree };

//# sourceMappingURL=index.js.map