@antv/x6/lib/common/algorithm/dijkstra.js

JavaScript diagramming library that uses SVG and HTML for rendering

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.dijkstra = dijkstra;
const priorityqueue_1 = require("./priorityqueue");
function dijkstra(adjacencyList, source, weight = (u, v) => 1) {
    const dist = {};
    const previous = {};
    const scanned = {};
    const queue = new priorityqueue_1.PriorityQueue();
    dist[source] = 0;
    Object.keys(adjacencyList).forEach((v) => {
        if (v !== source) {
            dist[v] = Infinity;
        }
        queue.insert(dist[v], v, v);
    });
    while (!queue.isEmpty()) {
        const u = queue.remove();
        scanned[u] = true;
        const neighbours = adjacencyList[u];
        for (let i = 0; i < neighbours.length; i += 1) {
            const v = neighbours[i];
            if (!scanned[v]) {
                const alt = dist[u] + weight(u, v);
                if (alt < dist[v]) {
                    dist[v] = alt;
                    previous[v] = u;
                    queue.updatePriority(v, alt);
                }
            }
        }
    }
    return previous;
}
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