@woosh/meep-engine/src/engine/intelligence/blackboard/make_blackboard_proxy.js

Pure JavaScript game engine. Fully featured and production ready.

import DataType from "../../../core/parser/simple/DataType.js";
import { computeDataTypeFromValue } from "../../../core/parser/simple/computeDataTypeFromValue.js";

/**
 * Given a blackboard, returns a Proxy instance, exposing blackboard attributes as plain JSON
 * Useful for connecting blackboard to systems that are not explicitly designed to work with a blackboard
 * @param {AbstractBlackboard} blackboard
 * @returns {Proxy}
 */
export function make_blackboard_proxy(blackboard) {
    return new Proxy(blackboard, {
        /**
         *
         * @param target
         * @param {string} p
         * @param receiver
         * @returns {*}
         */
        get(target, p, receiver) {

            if (!target.contains(p, DataType.Any)) {
                // property not found
                return undefined;
            }

            const value_container = target.acquire(p, DataType.Any);

            return value_container.getValue();
        },
        set(target, p, value, receiver) {

            const dataType = computeDataTypeFromValue(value);

            const value_container = target.acquire(p, dataType, value);

            value_container.set(value);

            // succeeded
            return true;
        },
        ownKeys(target) {

            return target.getKeys();

        }
    })
}