@vaadin/hilla-models/modelBuilders.js

Generative form models for Hilla

import { $defaultValue, $key, $meta, $name, $optional, $owner, } from './Model.js';
const { create, defineProperty } = Object;
const $model = Symbol('model');
export class CoreModelBuilder {
    [$model];
    constructor(base, defaultValueProvider) {
        this[$model] = create(base);
        if (defaultValueProvider) {
            this.defaultValueProvider(defaultValueProvider);
        }
    }
    meta(value) {
        this.define($meta, { value });
        return this;
    }
    define(key, value) {
        defineProperty(this[$model], key, value);
        return this;
    }
    defaultValueProvider(defaultValueProvider) {
        this.define($defaultValue, {
            get() {
                return defaultValueProvider(this);
            },
        });
        return this;
    }
    name(name) {
        return this.define($name, { value: name });
    }
    build() {
        return this[$model];
    }
}
const propertyRegistry = new WeakMap();
export class ObjectModelBuilder extends CoreModelBuilder {
    constructor(base) {
        super(base, (m) => {
            const result = {};
            for (const key in m) {
                const keyModel = m[key];
                result[key] = keyModel[$optional] ? undefined : keyModel[$defaultValue];
            }
            return result;
        });
    }
    object(name) {
        return this.name(name);
    }
    property(key, model) {
        defineProperty(this[$model], key, {
            enumerable: true,
            get() {
                if (!propertyRegistry.has(this)) {
                    propertyRegistry.set(this, {});
                }
                const props = propertyRegistry.get(this);
                props[key] ??= new CoreModelBuilder(typeof model === 'function' ? model(this) : model)
                    .define($key, { value: key })
                    .define($owner, { value: this })
                    .build();
                return props[key];
            },
        });
        return this;
    }
}
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