@eggjs/tegg-common-util
Version:
common util for tegg
168 lines • 11.9 kB
JavaScript
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.Graph = exports.GraphPath = exports.GraphNode = void 0;
const inspect = Symbol.for('nodejs.util.inspect.custom');
class GraphNode {
constructor(val) {
this.toNodeMap = new Map();
this.fromNodeMap = new Map();
this.val = val;
}
get id() {
return this.val.id;
}
addToVertex(node, meta) {
if (this.toNodeMap.has(node.id)) {
return false;
}
this.toNodeMap.set(node.id, { node, meta });
return true;
}
addFromVertex(node, meta) {
if (this.fromNodeMap.has(node.id)) {
return false;
}
this.fromNodeMap.set(node.id, { node, meta });
return true;
}
[inspect]() {
return this.toJSON();
}
toJSON() {
return {
val: this.val,
toNodes: Array.from(this.toNodeMap.values()),
fromNodes: Array.from(this.fromNodeMap.values()),
};
}
toString() {
return this.val.toString();
}
}
exports.GraphNode = GraphNode;
class GraphPath {
constructor() {
this.nodeIdMap = new Map();
this.nodes = [];
}
pushVertex(node, meta) {
const val = this.nodeIdMap.get(node.id) || 0;
this.nodeIdMap.set(node.id, val + 1);
this.nodes.push({ node, meta });
return val === 0;
}
popVertex() {
const nodeHandler = this.nodes.pop();
if (nodeHandler) {
const val = this.nodeIdMap.get(nodeHandler.node.id);
this.nodeIdMap.set(nodeHandler.node.id, val - 1);
}
}
toString() {
const res = this.nodes.reduce((p, c) => {
let msg = '';
if (c.meta) {
msg += ` ${c.meta.toString()} -> `;
}
else if (p.length) {
msg += ' -> ';
}
msg += c.node.val.toString();
p.push(msg);
return p;
}, new Array());
return res.join('');
}
[inspect]() {
return this.toString();
}
}
exports.GraphPath = GraphPath;
class Graph {
constructor() {
this.nodes = new Map();
}
addVertex(node) {
if (this.nodes.has(node.id)) {
return false;
}
this.nodes.set(node.id, node);
return true;
}
addEdge(from, to, meta) {
to.addFromVertex(from, meta);
return from.addToVertex(to, meta);
}
findToNode(id, meta) {
const node = this.nodes.get(id);
if (!node)
return undefined;
for (const { node: toNode, meta: edgeMeta } of node.toNodeMap.values()) {
if (edgeMeta && meta.equal(edgeMeta)) {
return toNode;
}
}
return undefined;
}
appendVertexToPath(node, accessPath, meta) {
if (!accessPath.pushVertex(node, meta)) {
return false;
}
for (const toNode of node.toNodeMap.values()) {
if (!this.appendVertexToPath(toNode.node, accessPath, toNode.meta)) {
return false;
}
}
accessPath.popVertex();
return true;
}
loopPath() {
const accessPath = new GraphPath();
const nodes = Array.from(this.nodes.values());
for (const node of nodes) {
if (!this.appendVertexToPath(node, accessPath)) {
return accessPath;
}
}
return;
}
accessNode(node, nodes, accessed, res) {
const index = nodes.indexOf(node);
if (accessed[index]) {
return;
}
if (!node.toNodeMap.size) {
accessed[nodes.indexOf(node)] = true;
res.push(node);
return;
}
for (const toNode of node.toNodeMap.values()) {
this.accessNode(toNode.node, nodes, accessed, res);
}
accessed[nodes.indexOf(node)] = true;
res.push(node);
}
// sort by direct
// priority:
// 1. vertex can not be access
// 2. reverse by access direct
//
// notice:
// 1. sort result is not stable
// 2. graph with loop can not be sort
sort() {
const res = [];
const nodes = Array.from(this.nodes.values());
const accessed = [];
for (let i = 0; i < nodes.length; ++i) {
accessed.push(false);
}
for (let i = 0; i < nodes.length; ++i) {
const node = nodes[i];
this.accessNode(node, nodes, accessed, res);
}
return res;
}
}
exports.Graph = Graph;
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