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/**
* @fileoverview Defines a storage for rules.
* @author Nicholas C. Zakas
* @author aladdin-add
*/
"use strict";
//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------
const builtInRules = require("../rules");
//------------------------------------------------------------------------------
// Helpers
//------------------------------------------------------------------------------
/**
* Normalizes a rule module to the new-style API
* @param {(Function|{create: Function})} rule A rule object, which can either be a function
* ("old-style") or an object with a `create` method ("new-style")
* @returns {{create: Function}} A new-style rule.
*/
function normalizeRule(rule) {
return typeof rule === "function" ? Object.assign({ create: rule }, rule) : rule;
}
//------------------------------------------------------------------------------
// Public Interface
//------------------------------------------------------------------------------
class Rules {
constructor() {
this._rules = Object.create(null);
}
/**
* Registers a rule module for rule id in storage.
* @param {string} ruleId Rule id (file name).
* @param {Function} ruleModule Rule handler.
* @returns {void}
*/
define(ruleId, ruleModule) {
this._rules[ruleId] = normalizeRule(ruleModule);
}
/**
* Access rule handler by id (file name).
* @param {string} ruleId Rule id (file name).
* @returns {{create: Function, schema: JsonSchema[]}}
* A rule. This is normalized to always have the new-style shape with a `create` method.
*/
get(ruleId) {
if (typeof this._rules[ruleId] === "string") {
this.define(ruleId, require(this._rules[ruleId]));
}
if (this._rules[ruleId]) {
return this._rules[ruleId];
}
if (builtInRules.has(ruleId)) {
return builtInRules.get(ruleId);
}
return null;
}
*[Symbol.iterator]() {
yield* builtInRules;
for (const ruleId of Object.keys(this._rules)) {
yield [ruleId, this.get(ruleId)];
}
}
}
module.exports = Rules;
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