Transformer

The Transformer class is used to transform data. The transformation is defined as a string.

import {Transformer} from '@schukai/monster/source/data/transformer.mjs';

const transformer = new Transformer("tolower")
console.log(transformer.run("HELLO"))
// ↦ hello

The following transformations are available:

(*) for this functionality the extension jsdom must be loaded in the nodejs context.

 // polyfill
if (typeof window !== "object") {
    const {window} = new JSDOM('', {
        url: 'http://example.com/',
        pretendToBeVisual: true
    });

    [
        'self',
        'document',
        'Node',
        'Element',
        'HTMLElement',
        'DocumentFragment',
        'DOMParser',
        'XMLSerializer',
        'NodeFilter',
        'InputEvent',
        'CustomEvent'
    ].forEach(key => (global[key] = window[key]));
}

(**) for this command the crypt library is necessary in the nodejs context.

import * as Crypto from "@peculiar/webcrypto";

global['crypto'] = new Crypto.Crypto();

With the method setCallback(name, callback, context) you can define your own transformation functions.

The context parameter is optional and can be used to define the context in which the callback function is called. If no context is specified, the global context is used. In the pipe the name of the callback function is used by prefixing it with a call:.

import {Transformer} from '@schukai/monster/source/data/transformer.mjs';

const transformer = new Transformer("call:myCallback");
transformer.setCallback("myCallback", function (value) {
    return value + " world";
});
console.log(transformer.run("hello")); // hello world