mar10/fancytree

/*
 * TODO: implement a simple nose-based server that
 *
 *     - serves the demo folder, so we don't need to use restricted local file
 *       file://... access
 *     - act as an ajax server that send lazy subnodes
 *     - See https://gist.github.com/701407
 */

/* eslint-env node */
/* eslint-disable one-var, no-console */

// TODO enable strict mode again
//"use strict";

var assert = require("assert"),
    http = require("http"),
    url = require("url");

/*
 * Helpers
 */
var NODE_ATTRS = ["title", "key"];

function copyNode(node, deep) {
    var i,
        l,
        name,
        node2 = {};
    for (i = 0, l = NODE_ATTRS.length; i < l; i++) {
        name = NODE_ATTRS[i];
        node2[name] = node[name];
    }
    return node2;
}
/*
 * Class TreeModel
 * Simple tree data structure
 */
var TreeModel = function () {
    this.children = [];
    this.keyMap = {};
};
TreeModel.prototype.find = function (key) {
    return this.keyMap[key];
};
TreeModel.prototype.append = function (node, obj) {
    // Calling append(obj) -> append(root, obj)
    if (obj === undefined) {
        obj = node;
        node = this;
    }
    assert.ok(obj.key && this.keyMap[obj.key] === undefined);
    if (node.children) {
        node.children.push(obj);
    } else {
        node.children = [obj];
    }
    this.keyMap[obj.key] = obj;
    obj.parent = node;
    return obj;
};
TreeModel.prototype.remove = function (key) {
    var node = this.keyMap[key],
        parent = node.parent,
        idx = parent.children.indexOf(node);
    parent.children.splice(idx, 1);
    delete this.keyMap[key];
};

/*
 * Init a new tree with some sample data
 */
var _tree = new TreeModel();
var n = _tree.append({ title: "node 1", key: "1", folder: true });
_tree.append(n, { title: "node 1.1", key: "1.1" });
_tree.append(n, { title: "node 1.2", key: "1.2" });
n = _tree.append({ title: "node 2", key: "2" });
_tree.append(n, { title: "node 2.1", key: "2.1" });

/**
 * Ajax server
 */
http.createServer(function (request, response) {
    var i,
        args = url.parse(request.url, true),
        query = args.query,
        parts = args.pathname.substring(1).split("/"),
        cmd = parts[0],
        node = _tree.find(query.key),
        res = { error: "invalid command" };
    console.log("args", args, parts);
    switch (cmd) {
        case "get":
            res = copyNode(node);
            break;
        case "children":
            res = [];
            if (node.children) {
                for (i = 0; i < node.children.length; i++) {
                    res.push(copyNode(node.children[i]));
                }
            }
            break;
    }
    console.log("children", node.children);
    console.log("json", copyNode(node));

    response.writeHead(200, { "Content-Type": "application/json" });
    response.end(JSON.stringify(res));
}).listen(8124);

console.log("Server running at http://127.0.0.1:8124/");