gun-flint/dist/Adapter/union.js

Micro-framework for building Gun adapters

"use strict";

/**
 * 
 * @param {object} vertex    A vertex to merge with the node
 * @param {object} node      A node to merge with the vertex
 * @param {number} opt       State for the union
 */
module.exports = function (Gun, vertex, node, opt) {
    if (!node || !node._) {
        return;
    }
    vertex = vertex || Gun.state.to(node);
    if (!vertex || !vertex._) {
        return;
    }
    opt = Gun.num.is(opt) ? { machine: opt } : { machine: Gun.state() };
    opt.union = Gun.obj.copy(vertex); // Slow performance.
    if (!Gun.node.is(node, function (val, key) {
        var HAM = Gun.HAM(opt.machine, Gun.state.is(node, key), Gun.state.is(vertex, key, true), val, vertex[key]);
        if (!HAM.incoming) {
            return;
        }
        Gun.state.to(node, key, opt.union);
    })) {
        return;
    }
    return opt.union;
};