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/**
* @fileoverview Defines a storage for rules.
* @author Nicholas C. Zakas
*/
"use strict";
//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------
const lodash = require("lodash");
const loadRules = require("./load-rules");
const ruleReplacements = require("../conf/replacements").rules;
const builtInRules = require("./built-in-rules-index");
//------------------------------------------------------------------------------
// Helpers
//------------------------------------------------------------------------------
/**
* Creates a stub rule that gets used when a rule with a given ID is not found.
* @param {string} ruleId The ID of the missing rule
* @returns {{create: function(RuleContext): Object}} A rule that reports an error at the first location
* in the program. The report has the message `Definition for rule '${ruleId}' was not found` if the rule is unknown,
* or `Rule '${ruleId}' was removed and replaced by: ${replacements.join(", ")}` if the rule is known to have been
* replaced.
*/
const createMissingRule = lodash.memoize(ruleId => {
const message = Object.prototype.hasOwnProperty.call(ruleReplacements, ruleId)
? `Rule '${ruleId}' was removed and replaced by: ${ruleReplacements[ruleId].join(", ")}`
: `Definition for rule '${ruleId}' was not found`;
return {
create: context => ({
Program() {
context.report({
loc: { line: 1, column: 0 },
message
});
}
})
};
});
/**
* 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);
this.defineAll(builtInRules);
}
/**
* 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);
}
/**
* Loads and registers all rules from passed rules directory.
* @param {string} [rulesDir] Path to rules directory, may be relative. Defaults to `lib/rules`.
* @param {string} cwd Current working directory
* @returns {void}
*/
load(rulesDir, cwd) {
const newRules = loadRules(rulesDir, cwd);
this.defineAll(newRules);
}
/**
* Pulls a Map of new rules to the defined ones of this instance.
* @param {Object} newRules Expects to have an object here that maps the rule ID to the rule definition.
* @returns {void}
*/
defineAll(newRules) {
Object.keys(newRules).forEach(ruleId => {
this.define(ruleId, newRules[ruleId]);
});
}
/**
* Registers all given rules of a plugin.
* @param {Object} plugin The plugin object to import.
* @param {string} pluginName The name of the plugin without prefix (`eslint-plugin-`).
* @returns {void}
*/
importPlugin(plugin, pluginName) {
if (plugin.rules) {
Object.keys(plugin.rules).forEach(ruleId => {
const qualifiedRuleId = `${pluginName}/${ruleId}`,
rule = plugin.rules[ruleId];
this.define(qualifiedRuleId, rule);
});
}
}
/**
* 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 (!Object.prototype.hasOwnProperty.call(this._rules, ruleId)) {
return createMissingRule(ruleId);
}
if (typeof this._rules[ruleId] === "string") {
return normalizeRule(require(this._rules[ruleId]));
}
return this._rules[ruleId];
}
/**
* Get an object with all currently loaded rules
* @returns {Map} All loaded rules
*/
getAllLoadedRules() {
const allRules = new Map();
Object.keys(this._rules).forEach(name => {
const rule = this.get(name);
allRules.set(name, rule);
});
return allRules;
}
}
module.exports = Rules;
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