tools: replace closure-linter with eslint

PR-URL: https://github.com/iojs/io.js/pull/1539
Fixes: https://github.com/iojs/io.js/issues/1253
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>
Reviewed-By: Trevor Norris <trev.norris@gmail.com>
Reviewed-By: Roman Reiss <me@silverwind.io>
Reviewed-By: Chris Dickinson <christopher.s.dickinson@gmail.com>
Reviewed-By: Johan Bergström <bugs@bergstroem.nu>
Reviewed-By: Fedor Indutny <fedor.indutny@gmail.com>

1 files changed, 67 insertions, 0 deletions

diff --git a/tools/eslint/lib/rules/max-nested-callbacks.js b/tools/eslint/lib/rules/max-nested-callbacks.js
new file mode 100644
index 0000000000..590274ffd1
--- /dev/null
+++ b/tools/eslint/lib/rules/max-nested-callbacks.js
@@ -0,0 +1,67 @@
+/**
+ * @fileoverview Rule to enforce a maximum number of nested callbacks.
+ * @author Ian Christian Myers
+ * @copyright 2013 Ian Christian Myers. All rights reserved.
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = function(context) {
+
+    //--------------------------------------------------------------------------
+    // Constants
+    //--------------------------------------------------------------------------
+
+    var THRESHOLD = context.options[0];
+
+    //--------------------------------------------------------------------------
+    // Helpers
+    //--------------------------------------------------------------------------
+
+    var callbackStack = [];
+
+    /**
+     * Checks a given function node for too many callbacks.
+     * @param {ASTNode} node The node to check.
+     * @returns {void}
+     * @private
+     */
+    function checkFunction(node) {
+        var parent = node.parent;
+
+        if (parent.type === "CallExpression") {
+            callbackStack.push(node);
+        }
+
+        if (callbackStack.length > THRESHOLD) {
+            var opts = {num: callbackStack.length, max: THRESHOLD};
+            context.report(node, "Too many nested callbacks ({{num}}). Maximum allowed is {{max}}.", opts);
+        }
+    }
+
+    /**
+     * Pops the call stack.
+     * @returns {void}
+     * @private
+     */
+    function popStack() {
+        callbackStack.pop();
+    }
+
+    //--------------------------------------------------------------------------
+    // Public API
+    //--------------------------------------------------------------------------
+
+    return {
+        "ArrowFunctionExpression": checkFunction,
+        "ArrowFunctionExpression:exit": popStack,
+
+        "FunctionExpression": checkFunction,
+        "FunctionExpression:exit": popStack
+    };
+
+};