/**
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* @fileoverview Defines a storage for rules.
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* @author Nicholas C. Zakas
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*/
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"use strict";
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//------------------------------------------------------------------------------
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// Requirements
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//------------------------------------------------------------------------------
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const lodash = require("lodash");
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const ruleReplacements = require("../conf/replacements").rules;
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const builtInRules = require("./built-in-rules-index");
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//------------------------------------------------------------------------------
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// Helpers
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//------------------------------------------------------------------------------
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/**
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* Creates a stub rule that gets used when a rule with a given ID is not found.
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* @param {string} ruleId The ID of the missing rule
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* @returns {{create: function(RuleContext): Object}} A rule that reports an error at the first location
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* in the program. The report has the message `Definition for rule '${ruleId}' was not found` if the rule is unknown,
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* or `Rule '${ruleId}' was removed and replaced by: ${replacements.join(", ")}` if the rule is known to have been
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* replaced.
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*/
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const createMissingRule = lodash.memoize(ruleId => {
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const message = Object.prototype.hasOwnProperty.call(ruleReplacements, ruleId)
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? `Rule '${ruleId}' was removed and replaced by: ${ruleReplacements[ruleId].join(", ")}`
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: `Definition for rule '${ruleId}' was not found`;
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return {
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create: context => ({
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Program() {
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context.report({
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loc: { line: 1, column: 0 },
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message
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});
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}
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})
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};
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});
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/**
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* Normalizes a rule module to the new-style API
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* @param {(Function|{create: Function})} rule A rule object, which can either be a function
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* ("old-style") or an object with a `create` method ("new-style")
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* @returns {{create: Function}} A new-style rule.
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*/
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function normalizeRule(rule) {
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return typeof rule === "function" ? Object.assign({ create: rule }, rule) : rule;
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}
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//------------------------------------------------------------------------------
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// Public Interface
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//------------------------------------------------------------------------------
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class Rules {
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constructor() {
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this._rules = Object.create(null);
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Object.keys(builtInRules).forEach(ruleId => {
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this.define(ruleId, builtInRules[ruleId]);
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});
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}
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/**
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* Registers a rule module for rule id in storage.
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* @param {string} ruleId Rule id (file name).
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* @param {Function} ruleModule Rule handler.
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* @returns {void}
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*/
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define(ruleId, ruleModule) {
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this._rules[ruleId] = normalizeRule(ruleModule);
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}
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/**
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* Access rule handler by id (file name).
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* @param {string} ruleId Rule id (file name).
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* @returns {{create: Function, schema: JsonSchema[]}}
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* A rule. This is normalized to always have the new-style shape with a `create` method.
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*/
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get(ruleId) {
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if (!Object.prototype.hasOwnProperty.call(this._rules, ruleId)) {
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return createMissingRule(ruleId);
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}
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if (typeof this._rules[ruleId] === "string") {
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return normalizeRule(require(this._rules[ruleId]));
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}
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return this._rules[ruleId];
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}
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/**
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* Get an object with all currently loaded rules
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* @returns {Map} All loaded rules
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*/
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getAllLoadedRules() {
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const allRules = new Map();
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Object.keys(this._rules).forEach(name => {
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const rule = this.get(name);
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allRules.set(name, rule);
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});
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return allRules;
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}
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}
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module.exports = Rules;
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