Adding no-tabs rule

src/rules/no-tabs.js

@@ -0,0 +1,31 @@
+/*
+ * Rule: Don't use tabs, use space
+ *
+ */
+
+CSSLint.addRule({
+
+    // rule information
+    id: "no-tabs",
+    name: "Disallow tabs",
+    desc: "Checks for tab",
+    browsers: "All",
+
+    // initialization
+    init: function(parser, reporter) {
+        "use strict";
+        var rule = this,
+            sheet;
+
+        parser.addListener("startstylesheet", function() {
+            sheet = this._tokenStream._reader._input.split(/\n/);
+        });
+
+        parser.addListener("property", function(event) {
+            if (/\t/.test(sheet[event.line - 1])) {
+                reporter.report("The TAB character is not allowed.", event.line, event.col, rule);
+            }
+        });
+    }
+
+});

tests/rules/no-tabs.js

@@ -0,0 +1,19 @@
+(function() {
+    "use strict";
+    var Assert = YUITest.Assert;
+
+    YUITest.TestRunner.add(new YUITest.TestCase({
+
+        name: "no-tabs rule errors",
+
+        "tabs in a stylesheet": function() {
+            var result = CSSLint.verify(".foo{\ttext-indent: -100px;}", { "no-tabs": 1 });
+
+            Assert.areEqual(1, result.messages.length);
+            Assert.areEqual("warning", result.messages[0].type);
+            Assert.areEqual("The TAB character is not allowed.", result.messages[0].message);
+        }
+
+    }));
+
+})();