confinode/lib/ConfigDescription/ConditionalDescription/ConditionalDescription.js

Node application configuration reader

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const ConfinodeError_1 = require("../../ConfinodeError");
const ConfigDescription_1 = require("../ConfigDescription");
/**
 * Description of a conditional configuration.
 */
class ConditionalDescription {
    /**
     * Create a conditional configuration description.
     *
     * @param predicate - The predicate to test the value against.
     * @param ifDescription - The description to use if predicate is true.
     * @param elseDescription - The description to use if predicate is false.
     */
    constructor(predicate, ifDescription, elseDescription) {
        this.predicate = predicate;
        this.ifDescription = ifDescription;
        this.elseDescription = elseDescription;
    }
    parse(data, context) {
        const { parent, ...inheritableContext } = context;
        if (data !== undefined && data !== null) {
            return this.predicate(data)
                ? ConfigDescription_1.asDescription(this.ifDescription).parse(data, inheritableContext)
                : ConfigDescription_1.asDescription(this.elseDescription).parse(data, inheritableContext);
        }
        else if (data === undefined && parent) {
            return parent;
        }
        else if (!context.final) {
            return undefined;
        }
        else {
            throw new ConfinodeError_1.default('missingMandatory', context.keyName);
        }
    }
}
exports.default = ConditionalDescription;
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