BetterDiscordApp-rauenzi/src/modules/utilities.js

/* eslint-disable no-console */

export default class Utilities {

    static stripBOM(content) {
        if (content.charCodeAt(0) === 0xFEFF) {
            content = content.slice(1);
        }
        return content;
    }

    static getTextArea() {
        return $(".channelTextArea-1LDbYG textarea");
    }

    static getInternalInstance(node) {
        return node[Object.keys(node).find(k => k.startsWith("__reactInternalInstance"))] || null;
    }

    static insertText(textarea, text) {
        textarea.focus();
        textarea.selectionStart = 0;
        textarea.selectionEnd = textarea.value.length;
        document.execCommand("insertText", false, text);
    }

    static injectCss(uri) {
        $("<link/>", {
            type: "text/css",
            rel: "stylesheet",
            href: uri
        }).appendTo($("head"));
    }

    static injectJs(uri) {
        return new Promise(resolve => {
            $("<script/>", {
                type: "text/javascript",
                src: uri,
                onload: resolve
            }).appendTo($("body"));
        });
    }

    static escapeID(id) {
        return id.replace(/^[^a-z]+|[^\w-]+/gi, "-");
    }

    static escape(s) {
        return s.replace(/[-/\\^$*+?.()|[\]{}]/g, "\\$&");
    }

    static testJSON(data) {
        try {
            return JSON.parse(data);
        }
        catch (err) {
            return false;
        }
    }

    static suppressErrors(method, message) {
        return (...params) => {
            try { return method(...params);	}
            catch (e) { this.err("SuppressedError", "Error occurred in " + message, e); }
        };
    }

    static monkeyPatch(what, methodName, options) {
        const {before, after, instead, once = false, silent = false, force = false} = options;
        const displayName = options.displayName || what.displayName || what.name || what.constructor.displayName || what.constructor.name;
        if (!silent) console.log("patch", methodName, "of", displayName); // eslint-disable-line no-console
        if (!what[methodName]) {
            if (force) what[methodName] = function() {};
            else return console.error(methodName, "does not exist for", displayName); // eslint-disable-line no-console
        }
        const origMethod = what[methodName];
        const cancel = () => {
            if (!silent) console.log("unpatch", methodName, "of", displayName); // eslint-disable-line no-console
            what[methodName] = origMethod;
        };
        what[methodName] = function() {
            const data = {
                thisObject: this,
                methodArguments: arguments,
                cancelPatch: cancel,
                originalMethod: origMethod,
                callOriginalMethod: () => data.returnValue = data.originalMethod.apply(data.thisObject, data.methodArguments)
            };
            if (instead) {
                const tempRet = Utilities.suppressErrors(instead, "`instead` callback of " + what[methodName].displayName)(data);
                if (tempRet !== undefined) data.returnValue = tempRet;
            }
            else {
                if (before) Utilities.suppressErrors(before, "`before` callback of " + what[methodName].displayName)(data);
                data.callOriginalMethod();
                if (after) Utilities.suppressErrors(after, "`after` callback of " + what[methodName].displayName)(data);
            }
            if (once) cancel();
            return data.returnValue;
        };
        what[methodName].__monkeyPatched = true;
        if (!what[methodName].__originalMethod) what[methodName].__originalMethod = origMethod;
        what[methodName].displayName = "patched " + (what[methodName].displayName || methodName);
        return cancel;
    }

    static onRemoved(node, callback) {
        const observer = new MutationObserver((mutations) => {
            for (let m = 0; m < mutations.length; m++) {
                const mutation = mutations[m];
                const nodes = Array.from(mutation.removedNodes);
                const directMatch = nodes.indexOf(node) > -1;
                const parentMatch = nodes.some(parent => parent.contains(node));
                if (directMatch || parentMatch) {
                    observer.disconnect();
                    callback();
                }
            }
        });

        observer.observe(document.body, {subtree: true, childList: true});
    }

    static isEmpty(obj) {
        if (obj == null || obj == undefined || obj == "") return true;
        if (typeof(obj) !== "object") return false;
        if (Array.isArray(obj)) return obj.length == 0;
        for (const key in obj) {
            if (obj.hasOwnProperty(key)) return false;
        }
        return true;
    }

    /**
     * Generates an automatically memoizing version of an object.
     * @author Zerebos
     * @param {Object} object - object to memoize
     * @returns {Proxy} the proxy to the object that memoizes properties
     */
    static memoizeObject(object) {
        const proxy = new Proxy(object, {
            get: function(obj, mod) {
                if (!obj.hasOwnProperty(mod)) return undefined;
                if (Object.getOwnPropertyDescriptor(obj, mod).get) {
                    const value = obj[mod];
                    delete obj[mod];
                    obj[mod] = value;
                }
                return obj[mod];
            },
            set: function(obj, mod, value) {
                if (obj.hasOwnProperty(mod)) return this.err("MemoizedObject", "Trying to overwrite existing property");
                obj[mod] = value;
                return obj[mod];
            }
        });

        Object.defineProperty(proxy, "hasOwnProperty", {value: function(prop) {
            return this[prop] !== undefined;
        }});

        return proxy;
    }
}