1 files changed, 66 insertions, 0 deletions
diff --git a/tools/eslint/lib/rules/quote-props.js b/tools/eslint/lib/rules/quote-props.js
new file mode 100644
index 0000000000..ccac947853
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+++ b/tools/eslint/lib/rules/quote-props.js
@@ -0,0 +1,66 @@
+/**
+ * @fileoverview Rule to flag non-quoted property names in object literals.
+ * @author Mathias Bynens <http://mathiasbynens.be/>
+ * @copyright 2014 Brandon Mills. All rights reserved.
+ */
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+var espree = require("espree");
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = function(context) {
+
+    var MODE = context.options[0];
+
+    /**
+     * Ensures that a property's key is quoted only when necessary
+     * @param   {ASTNode} node Property AST node
+     * @returns {void}
+     */
+    function asNeeded(node) {
+        var key = node.key,
+            tokens;
+
+        if (key.type === "Literal" && typeof key.value === "string") {
+            try {
+                tokens = espree.tokenize(key.value);
+            } catch (e) {
+                return;
+            }
+
+            if (tokens.length === 1 &&
+                (["Identifier", "Null", "Boolean"].indexOf(tokens[0].type) >= 0 ||
+                (tokens[0].type === "Numeric" && "" + +tokens[0].value === tokens[0].value))
+            ) {
+                context.report(node, "Unnecessarily quoted property `{{value}}` found.", key);
+            }
+        }
+    }
+
+    /**
+     * Ensures that a property's key is quoted
+     * @param   {ASTNode} node Property AST node
+     * @returns {void}
+     */
+    function always(node) {
+        var key = node.key;
+
+        if (!node.method && !(key.type === "Literal" && typeof key.value === "string")) {
+            context.report(node, "Unquoted property `{{key}}` found.", {
+                key: key.name || key.value
+            });
+        }
+    }
+
+    return {
+        "Property": MODE === "as-needed" ? asNeeded : always
+    };
+
+};