yoni-mcscripts-lib/yoni/lib/deepcopy.js

为 Minecraft Script API 中的部分接口创建了 wrapper，并提供简单的事件管理器和任务管理器，另附有一些便于代码编写的一些小工具。

//@ts-nocheck
const DEFAULT_OPTIONS = {
    rootObject: undefined,
    newObjectMaker: () => ({}),
    dealCircular: ["ignore", "error"][1],
    copyFunction: {
        getCopiedValue,
        isCopyableValue,
    }
};
export function deepcopy(value, option = {}) {
    let applyOption = Object.assign({}, DEFAULT_OPTIONS, option);
    const { newObjectMaker, dealCircular } = applyOption;
    const { getCopiedValue, isCopyableValue } = applyOption.copyFunction;
    let rootnvalue = applyOption.rootObject ?? newObjectMaker();
    let nvalue = rootnvalue;
    let toCopyObjects = new Map();
    let referenceChainRecord = new WeakMap();
    for (;;) {
        let referenceRecord = referenceChainRecord.get(nvalue) ?? [];
        let skipCopy = false;
        if (referenceRecord.includes(value)) {
            if (dealCircular === "error")
                throw new Error("circular reference");
            else
                skipCopy = true;
        }
        referenceRecord.push(value);
        if (!skipCopy)
            for (const key in value) {
                let subvalue = value[key];
                if (isCopyableValue(subvalue)) {
                    nvalue[key] = getCopiedValue(subvalue);
                }
                else {
                    let subobject = newObjectMaker();
                    referenceChainRecord.set(subobject, referenceRecord.slice(0));
                    nvalue[key] = subobject;
                    toCopyObjects.set(subobject, subvalue);
                }
            }
        if (toCopyObjects.size === 0)
            break;
        nvalue = toCopyObjects.keys().next().value;
        value = toCopyObjects.get(nvalue);
        toCopyObjects.delete(nvalue);
    }
    return rootnvalue;
}
export function isCopyableValue(value) {
    switch (typeof value) {
        case "string":
        case "boolean":
        case "bigint":
        case "number":
        case "undefined":
            break;
        case "object":
            if (value === null)
                break;
        default:
            return false;
    }
    return true;
}
export function getCopiedValue(value) {
    switch (typeof value) {
        case "string":
        case "boolean":
        case "bigint":
        case "number":
        case "undefined":
            break;
        case "object":
            if (value === null)
                break;
        default:
            throw new TypeError("value not copyable");
    }
    return value;
}