1 files changed, 71 insertions, 0 deletions
diff --git a/tools/eslint/lib/rules/spaced-line-comment.js b/tools/eslint/lib/rules/spaced-line-comment.js
new file mode 100644
index 0000000000..af5ba8cdb6
--- /dev/null
+++ b/tools/eslint/lib/rules/spaced-line-comment.js
@@ -0,0 +1,71 @@
+/**
+ * @fileoverview Enforces or disallows a space beginning a single-line comment.
+ * @author Greg Cochard
+ * @copyright 2014 Greg Cochard. All rights reserved.
+ */
+"use strict";
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = function(context) {
+
+    // Unless the first option is never, require a space
+    var requireSpace = context.options[0] !== "never";
+
+    // Default to match anything, so all will fail if there are no exceptions
+    var exceptionMatcher = new RegExp(" ");
+
+    // Grab the exceptions array and build a RegExp matcher for it
+    var hasExceptions = context.options.length === 2;
+    var unescapedExceptions = hasExceptions ? context.options[1].exceptions : [];
+    var exceptions;
+
+    if (unescapedExceptions.length) {
+        exceptions = unescapedExceptions.map(function(s) {
+            return s.replace(/([.*+?${}()|\^\[\]\/\\])/g, "\\$1");
+        });
+        exceptionMatcher = new RegExp("(^(" + exceptions.join(")+$)|(^(") + ")+$)");
+    }
+
+
+    //--------------------------------------------------------------------------
+    // Public
+    //--------------------------------------------------------------------------
+
+    return {
+
+        "LineComment": function checkCommentForSpace(node) {
+
+            if (requireSpace) {
+
+                // If length is zero, ignore it
+                if (node.value.length === 0) {
+                    return;
+                }
+
+                // Space expected and not found
+                if (node.value.indexOf(" ") !== 0 && node.value.indexOf("\t") !== 0) {
+
+                    /*
+                     * Do two tests; one for space starting the line,
+                     * and one for a comment comprised only of exceptions
+                     */
+                    if (hasExceptions && !exceptionMatcher.test(node.value)) {
+                        context.report(node, "Expected exception block, space or tab after // in comment.");
+                    } else if (!hasExceptions) {
+                        context.report(node, "Expected space or tab after // in comment.");
+                    }
+                }
+
+            } else {
+
+                if (node.value.indexOf(" ") === 0 || node.value.indexOf("\t") === 0) {
+                    context.report(node, "Unexpected space or tab after // in comment.");
+                }
+            }
+        }
+
+    };
+};