node-jet/lib/3_jet/daemon/value_matcher.js

Jet Realtime Message Bus for the Web. Daemon and Peer implementation.

import { InvalidArgument } from '../errors.js';
import { getValue } from '../utils.js';
const generators = {
    equals: (field, other) => (x) => getValue(x, field) === other,
    lessThan: (field, other) => (x) => getValue(x, field) < other,
    equalsNot: (field, other) => (x) => getValue(x, field) !== other,
    greaterThan: (field, other) => (x) => getValue(x, field) > other,
    isType: (field, other) => (x) => typeof getValue(x, field) === other
};
const generatePredicate = (field, rule) => {
    const gen = generators[rule.operator];
    if (!gen) {
        throw new InvalidArgument('unknown rule ' + rule.operator);
    }
    if (rule.value === null) {
        throw new InvalidArgument('unknown value cant be nullish');
    }
    return gen(field, rule.value);
};
const createValuePredicates = (valueOptions) => {
    const predicates = [];
    Object.entries(valueOptions).forEach(([field, rule]) => {
        predicates.push(generatePredicate(field, rule));
    });
    return predicates;
};
export const create = (options) => {
    if (options.value) {
        const predicates = createValuePredicates(options.value);
        return (value) => {
            if (value === undefined)
                return false;
            for (let i = 0; i < predicates.length; ++i) {
                if (!predicates[i](value)) {
                    return false;
                }
            }
            return true;
        };
    }
    return () => true;
};