MediaWiki:MobileUI.js

// @ts-check

/**
 * @typedef MediaWiki
 * @prop {readonly Map<string, any>} config
 */

/**
 * @typedef MenuDataItemComponent
 * @prop {string} [text]
 * @prop {string} [title]
 * @prop {string} [href]
 * @prop {string} [id]
 * @prop {string | string[]} [class]
 * @prop {string} [dataEventName]
 */

/**
 * @typedef MenuDataItem
 * @prop {string} [id]
 * @prop {string | string[]} [class]
 * @prop {MenuDataItemComponent[]} components
 */

/**
 * @typedef MenuDataGroup
 * @prop {string} [id]
 * @prop {string | string[]} [class]
 * @prop {MenuDataItem[]} items
 */

/**
 * @typedef MobileUI
 * @prop {MenuDataGroup[]} leftGroups
 * @prop {MenuDataGroup[]} rightGroups
 */

class MobileUIBuilder {
    /**
     * @param {MediaWiki} mw
     */
    constructor(mw) {
        // this.mw = mw;

        /**
         * @type {string}
         */
        this.wgServer = mw.config.get("wgServer");

        /**
         * @type {string}
         */
        this.wgScriptPath = mw.config.get("wgScriptPath");

        /**
         * @type {number}
         */
        this.wgArticleId = mw.config.get("wgArticleId");

        /**
         * @type {boolean}
         */
        this.wgIsArticle = mw.config.get("wgIsArticle");

        /**
         * @type {boolean}
         */
        this.wgIsMainPage = mw.config.get("wgIsMainPage");
    }

    /**
     * @param {MenuDataItemComponent} component
     * @returns {string}
     */
    hrefForMenuDataItemComponent(component) {
        switch (component.id) {
            case "mobile-ui-page-short-url":
                return (
                    this.wgServer
                    + this.wgScriptPath
                    + "?curid="
                    + String(this.wgArticleId)
                );

            default:
                return component.title
                    ? (this.wgScriptPath + "/" + component.title)
                    : component.href;
        }
    }

    /**
     * @param {MenuDataItemComponent} component
     * @returns {HTMLAnchorElement}
     */
    menuDataItemComponent(component) {
        const href = this.hrefForMenuDataItemComponent(component);

        const element = window.document.createElement("a");
        element.text = component.text || href;
        element.href = encodeURI(href);
        element.id = component.id || "";
        element.classList.add(...[].concat(component.class));
        element.setAttribute("data-event-name", component.dataEventName || "");

        return element;
    }

    /**
     * @param {MenuDataItem} item
     * @returns {HTMLLIElement}
     */
    menuDataItem(item) {
        /**
         * @type {HTMLAnchorElement[]}
         */
        const children = [];

        for (const component of item.components) {
            children.push(this.menuDataItemComponent(component));
        }

        const element = window.document.createElement("li");
        element.id = item.id || "";
        element.classList.add(...[].concat(item.class));
        element.append(...children);

        return element;
    }

    /**
     * @param {MenuDataGroup} group
     * @returns {HTMLUListElement}
     */
    menuDataGroup(group) {
        /**
         * @type {HTMLLIElement[]}
         */
        const children = [];

        for (const item of group.items) {
            children.push(this.menuDataItem(item));
            Function.call
        }

        const element = window.document.createElement("ul");
        element.id = group.id || "";
        element.classList.add(...[].concat(group.class));
        element.append(...children);

        return element;
    }

    /**
     * @param {MenuDataGroup[]} groups
     * @returns {HTMLUListElement[]}
     */
    menuDataGroups(groups) {
        /**
         * @type {HTMLUListElement[]}
         */
        const children = [];

        for (const group of groups) {
            children.push(this.menuDataGroup(group));
        }

        return children;
    }

    /**
     * @param {Node} node
     * @returns {HTMLElement | null}
     */
    elementIfTarget(node) {
        const element = /** @type {HTMLElement} */ (node);
        const { classList } = element;

        if (!classList) return null;
        if (!classList.contains("menu")) return null;
        if (classList.contains("menu-right")) return null;

        return element;
    }

    /**
     * @returns {HTMLElement}
     */
    get navElement() {
        return window.document.getElementById("mw-mf-page-left");
    }

    /**
     * @returns {HTMLDivElement | null}
     */
    get menuElement() {
        return /** @type {HTMLDivElement} */ (
            this.navElement.getElementsByClassName("menu").item(0)
        );
    }

    /**
     * @param {MobileUI} mobileUI
     * @param {HTMLElement} menuElement
     */
    modify(mobileUI, menuElement) {
        const navElement = this.navElement;
        if (!this.wgIsArticle || this.wgIsMainPage) {
            navElement.classList.add("mobile-ui-not-article");
        }

        const firstGroup = menuElement.getElementsByTagName("ul").item(0);
        if (firstGroup) {
            firstGroup.style.display = "none";
        }

        const leftGroups = this.menuDataGroups(mobileUI.leftGroups);
        menuElement.prepend(...leftGroups);

        const rightMenuElement = window.document.createElement("div");
        rightMenuElement.classList.add(...menuElement.classList, "menu-right");

        const rightGroups = this.menuDataGroups(mobileUI.rightGroups);
        rightMenuElement.append(...rightGroups);
        navElement.append(rightMenuElement);
    }

    /**
     * @param {MobileUI} mobileUI
     */
    build(mobileUI) {
        const element = this.menuElement;

        if (element) {
            this.modify(mobileUI, element);
            return;
        }

        const observer = new MutationObserver((mutations, observer) => {
            for (const record of mutations) {
                for (const node of record.addedNodes) {
                    const element = this.elementIfTarget(node);
                    if (element) {
                        observer.disconnect();
                        this.modify(mobileUI, element);
                        return;
                    }
                }
            }
        });

        observer.observe(this.navElement, { childList: true });
    }
}