1 files changed, 83 insertions, 0 deletions
diff --git a/tools/eslint/lib/rules/max-depth.js b/tools/eslint/lib/rules/max-depth.js
new file mode 100644
index 0000000000..cc7e366257
--- /dev/null
+++ b/tools/eslint/lib/rules/max-depth.js
@@ -0,0 +1,83 @@
+/**
+ * @fileoverview A rule to set the maximum depth block can be nested in a function.
+ * @author Ian Christian Myers
+ * @copyright 2013 Ian Christian Myers. All rights reserved.
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = function(context) {
+
+    //--------------------------------------------------------------------------
+    // Helpers
+    //--------------------------------------------------------------------------
+
+    var functionStack = [],
+        maxDepth = context.options[0] || 4;
+
+    function startFunction() {
+        functionStack.push(0);
+    }
+
+    function endFunction() {
+        functionStack.pop();
+    }
+
+    function pushBlock(node) {
+        var len = ++functionStack[functionStack.length - 1];
+
+        if (len > maxDepth) {
+            context.report(node, "Blocks are nested too deeply ({{depth}}).",
+                    { depth: len });
+        }
+    }
+
+    function popBlock() {
+        functionStack[functionStack.length - 1]--;
+    }
+
+    //--------------------------------------------------------------------------
+    // Public API
+    //--------------------------------------------------------------------------
+
+    return {
+        "Program": startFunction,
+        "FunctionDeclaration": startFunction,
+        "FunctionExpression": startFunction,
+        "ArrowFunctionExpression": startFunction,
+
+        "IfStatement": function(node) {
+            if (node.parent.type !== "IfStatement") {
+                pushBlock(node);
+            }
+        },
+        "SwitchStatement": pushBlock,
+        "TryStatement": pushBlock,
+        "DoWhileStatement": pushBlock,
+        "WhileStatement": pushBlock,
+        "WithStatement": pushBlock,
+        "ForStatement": pushBlock,
+        "ForInStatement": pushBlock,
+        "ForOfStatement": pushBlock,
+
+        "IfStatement:exit": popBlock,
+        "SwitchStatement:exit": popBlock,
+        "TryStatement:exit": popBlock,
+        "DoWhileStatement:exit": popBlock,
+        "WhileStatement:exit": popBlock,
+        "WithStatement:exit": popBlock,
+        "ForStatement:exit": popBlock,
+        "ForInStatement:exit": popBlock,
+        "ForOfStatement:exit": popBlock,
+
+        "FunctionDeclaration:exit": endFunction,
+        "FunctionExpression:exit": endFunction,
+        "ArrowFunctionExpression:exit": endFunction,
+        "Program:exit": endFunction
+    };
+
+};