@connectv/core/dist/es6/agent/check.js

agent-based reactive programming library for typescript/javascript

import { filter } from '../pin/filter';
import { map } from '../pin/map';
import { Agent } from './agent';
/**
 *
 * Represents [check](https://connective.dev/docs/check) agents.
 *
 */
export class Check extends Agent {
    /**
     *
     * @param predicate the predicate function to pass or fail incoming values against.
     *
     */
    constructor(predicate) {
        super({
            inputs: ['value'],
            outputs: ['pass', 'fail']
        });
        this.predicate = predicate;
        if (predicate.length <= 1)
            this.core = this.input.to(map((v) => [v, predicate(v)]));
        else
            this.core = this.input.to(map((v, done, error, context) => predicate(v, res => done([v, res]), error, context)));
    }
    /**
     *
     * Shortcut for `.in('value')`, the main value input for this check.
     * [Read this](https://connective.dev/docs/check#signature) for more details.
     *
     */
    get input() { return this.in('value'); }
    /**
     *
     * Shortcut for `.out('pass')`, the output for values passing the criteria outline by given predicate.
     * [Read this](https://connective.dev/docs/check#signature) for more details.
     *
     */
    get pass() { return this.out('pass'); }
    /**
     *
     * Shortcut for `.out('fail')`, the output for values failing the criteria outline by given predicate.
     * [Read this](https://connective.dev/docs/check#signature) for more details.
     *
     */
    get fail() { return this.out('fail'); }
    createOutput(label) {
        this.checkOutput(label);
        if (label == 'pass') {
            return this.core
                .to(filter(([_, v]) => v))
                .to(map(([v, _]) => v));
        }
        else {
            return this.core
                .to(filter(([_, v]) => !v))
                .to(map(([v, _]) => v));
        }
    }
    createEntries() { return [this.input]; }
    createExits() { return [this.pass, this.fail]; }
}
/**
 *
 * Creates a [check](https://connective.dev/docs/check) agent. A check agent
 * will pass or fail incoming values based on given predicate, passing them through
 * the corresponding outputs.
 * [Checkout the docs](https://connective.dev/docs/check) for examples and further information.
 *
 * @param func the predicate to test incoming values against
 *
 */
export function check(func) { return new Check(func); }
export default check;
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