twing-loader proof of concept

bundle.js

const {TwingEnvironment, TwingLoaderArray} = require('twing');
const {readFileSync} = require('fs');

class CustomCache {
    constructor() {
        /**
         * @type {Map<*, string>}
         */
        this.templates = new Map();
        this.TwingCacheInterfaceImpl = this;
    }

    /**
     * Generates a cache key for the given template class name.
     *
     * @param {string} name The template name
     * @param {string} className The template class name
     *
     * @return string
     */
    generateKey(name, className) {
        return className;
    }

    /**
     * Writes the compiled template to cache.
     *
     * @param {string} key The cache key
     * @param {string} content The template representation as a PHP class
     */
    write(key, content) {
        this.templates.set(key, content);
    };

    /**
     * Loads a template from the cache.
     *
     * @param {string} key The cache key
     */
    load(key) {
        console.warn('LOAD', key);

        let content = this.templates.get(key);

        let f = new Function(`let module = {
    exports: undefined
};

${content}

return module.exports;

`);
        console.warn(f());

        return f();
    }

    /**
     * Returns the modification timestamp of a key.
     *
     * @param {string} key The cache key
     *
     * @returns {number}
     */
    getTimestamp(key) {
        return 0;
    }
}

class CustomLoader extends TwingLoaderArray {
    getCacheKey(name) {
        console.warn(this.templates, name);

        return this.templates.get(name);
    }
}

class CustomEnvironment extends TwingEnvironment {
    getTemplateClass(name, index = null, from = null) {
        let key = this.getLoader().getCacheKey(name, from);
        return key + (index === null ? '' : '_' + index);
    }
}

let cache = new CustomCache();

let indexAsString = readFileSync('cache/98/98bf74c5a7c4771ad5a280d1021876b1f55094365c7c7c06e7d15155c20fbd07.js', 'UTF-8');
let parentAsString = readFileSync('cache/a3/a3ca1b89ea58826d6b345e1051822bd8b0b0928d713b07203ee4e2a4657b92f7.js', 'UTF-8');
let partialAsString = readFileSync('cache/ea/eaa15d3686b0dc5230420bb03a37cf927e8b5b5e62fad80eff85410c5a1ce829.js', 'UTF-8');
let skeletonAsString = readFileSync('cache/6c/6c67a2435e97a9b2758d66c565bcdbfe93218ef564d1b074e11052259c22e89b.js', 'UTF-8');

let indexClassName = '__TwingTemplate_42c2ebb8182f0d7aaf434822b1db3df611d7eb6bce3bddab9678e19e9e3c53cb';
let parentClassName = '__TwingTemplate_e686c9163e21c21622917f76462c9454b507077586c734948e918d0865ee94f7';
let partialClassName = '__TwingTemplate_145a017a1f3709f0ae6396f73b4ede3b8bb0eb23580ab102bb111ee654c0a017';
let skeletonClassName = '__TwingTemplate_bff4a4771cf09e4bd107900999dca27a4dceeb40a8c5290c7a6d27aaf2af23f8';

cache.write(indexClassName, indexAsString);
cache.write(parentClassName, parentAsString);
cache.write(partialClassName, partialAsString);
cache.write(skeletonClassName, skeletonAsString);

let env = new CustomEnvironment(new CustomLoader({
    index: indexClassName,
    parent: parentClassName,
    partial: partialClassName,
    skeleton: skeletonClassName
}), {
    cache: cache
});

console.warn(env.render('index', {
    data: {
        title: 'Hello Twing!'
    }
}));