1 files changed, 76 insertions, 0 deletions
diff --git a/tools/eslint/lib/rules/space-after-keywords.js b/tools/eslint/lib/rules/space-after-keywords.js
new file mode 100644
index 0000000000..3ece8bb065
--- /dev/null
+++ b/tools/eslint/lib/rules/space-after-keywords.js
@@ -0,0 +1,76 @@
+/**
+ * @fileoverview Rule to enforce the number of spaces after certain keywords
+ * @author Nick Fisher
+ * @copyright 2014 Nick Fisher. All rights reserved.
+ */
+"use strict";
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = function(context) {
+
+    // unless the first option is `"never"`, then a space is required
+    var requiresSpace = context.options[0] !== "never";
+
+    /**
+     * Check if the separation of two adjacent tokens meets the spacing rules, and report a problem if not.
+     *
+     * @param {ASTNode} node  The node to which the potential problem belongs.
+     * @param {Token} left    The first token.
+     * @param {Token} right   The second token
+     * @returns {void}
+     */
+    function checkTokens(node, left, right) {
+        var hasSpace = left.range[1] < right.range[0],
+            value = left.value;
+
+        if (hasSpace !== requiresSpace) {
+            context.report(node, "Keyword \"{{value}}\" must {{not}}be followed by whitespace.", {
+                value: value,
+                not: requiresSpace ? "" : "not "
+            });
+        }
+    }
+
+    /**
+     * Check if the given node (`if`, `for`, `while`, etc), has the correct spacing after it.
+     * @param {ASTNode} node The node to check.
+     * @returns {void}
+     */
+    function check(node) {
+        var tokens = context.getFirstTokens(node, 2);
+        checkTokens(node, tokens[0], tokens[1]);
+    }
+
+    return {
+        "IfStatement": function (node) {
+            check(node);
+            // check the `else`
+            if (node.alternate && node.alternate.type !== "IfStatement") {
+                checkTokens(node.alternate, context.getTokenBefore(node.alternate), context.getFirstToken(node.alternate));
+            }
+        },
+        "ForStatement": check,
+        "ForOfStatement": check,
+        "ForInStatement": check,
+        "WhileStatement": check,
+        "DoWhileStatement": function (node) {
+            check(node);
+            // check the `while`
+            var whileTokens = context.getTokensBefore(node.test, 2);
+            checkTokens(node, whileTokens[0], whileTokens[1]);
+        },
+        "SwitchStatement": check,
+        "TryStatement": function (node) {
+            check(node);
+            // check the `finally`
+            if (node.finalizer) {
+                checkTokens(node.finalizer, context.getTokenBefore(node.finalizer), context.getFirstToken(node.finalizer));
+            }
+        },
+        "CatchStatement": check,
+        "WithStatement": check
+    };
+};