1 files changed, 63 insertions, 0 deletions
diff --git a/tools/eslint/lib/rules/dot-location.js b/tools/eslint/lib/rules/dot-location.js
new file mode 100644
index 00000000000..6e83b984887
--- /dev/null
+++ b/tools/eslint/lib/rules/dot-location.js
@@ -0,0 +1,63 @@
+/**
+ * @fileoverview Validates newlines before and after dots
+ * @author Greg Cochard
+ * @copyright 2015 Greg Cochard
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = function (context) {
+
+    var config = context.options[0],
+        // default to onObject if no preference is passed
+        onObject = config === "object" || !config;
+
+    /**
+     * Checks whether two tokens are on the same line.
+     * @param {Object} left The leftmost token.
+     * @param {Object} right The rightmost token.
+     * @returns {boolean} True if the tokens are on the same line, false if not.
+     * @private
+     */
+    function isSameLine(left, right) {
+        return left.loc.end.line === right.loc.start.line;
+    }
+
+    /**
+     * Reports if the dot between object and property is on the correct loccation.
+     * @param {ASTNode} obj The object owning the property.
+     * @param {ASTNode} prop The property of the object.
+     * @param {ASTNode} node The corresponding node of the token.
+     * @returns {void}
+     */
+    function checkDotLocation(obj, prop, node) {
+        var dot = context.getTokenBefore(prop);
+
+        if (dot.type === "Punctuator" && dot.value === ".") {
+            if (onObject) {
+                if (!isSameLine(obj, dot)) {
+                    context.report(node, dot.loc.start, "Expected dot to be on same line as object.");
+                }
+            } else if (!isSameLine(dot, prop)) {
+                context.report(node, dot.loc.start, "Expected dot to be on same line as property.");
+            }
+        }
+    }
+
+    /**
+     * Checks the spacing of the dot within a member expression.
+     * @param {ASTNode} node The node to check.
+     * @returns {void}
+     */
+    function checkNode(node) {
+        checkDotLocation(node.object, node.property, node);
+    }
+
+    return {
+        "MemberExpression": checkNode
+    };
+};