1 files changed, 140 insertions, 0 deletions
diff --git a/tools/node_modules/eslint/lib/rules.js b/tools/node_modules/eslint/lib/rules.js
new file mode 100644
index 0000000000..040f9db505
--- /dev/null
+++ b/tools/node_modules/eslint/lib/rules.js
@@ -0,0 +1,140 @@
+/**
+ * @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;
+
+//------------------------------------------------------------------------------
+// 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.load();
+    }
+
+    /**
+     * 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);
+
+        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;