1 files changed, 83 insertions, 0 deletions
diff --git a/tools/eslint/lib/rules/quotes.js b/tools/eslint/lib/rules/quotes.js
new file mode 100644
index 0000000000..2bb10ea5e4
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+++ b/tools/eslint/lib/rules/quotes.js
@@ -0,0 +1,83 @@
+/**
+ * @fileoverview A rule to choose between single and double quote marks
+ * @author Matt DuVall <http://www.mattduvall.com/>, Brandon Payton
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Constants
+//------------------------------------------------------------------------------
+
+var QUOTE_SETTINGS = {
+    "double": {
+        quote: "\"",
+        alternateQuote: "'",
+        description: "doublequote"
+    },
+    "single": {
+        quote: "'",
+        alternateQuote: "\"",
+        description: "singlequote"
+    },
+    "backtick": {
+        quote: "`",
+        alternateQuote: "\"",
+        description: "backtick"
+    }
+};
+
+var AVOID_ESCAPE = "avoid-escape";
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = function(context) {
+
+    /**
+     * Validate that a string passed in is surrounded by the specified character
+     * @param  {string} val The text to check.
+     * @param  {string} character The character to see if it's surrounded by.
+     * @returns {boolean} True if the text is surrounded by the character, false if not.
+     * @private
+     */
+    function isSurroundedBy(val, character) {
+        return val[0] === character && val[val.length - 1] === character;
+    }
+
+    /**
+     * Determines if a given node is part of JSX syntax.
+     * @param {ASTNode} node The node to check.
+     * @returns {boolean} True if the node is a JSX node, false if not.
+     * @private
+     */
+    function isJSXElement(node) {
+        return node.type.indexOf("JSX") === 0;
+    }
+
+    return {
+
+        "Literal": function(node) {
+            var val = node.value,
+                rawVal = node.raw,
+                quoteOption = context.options[0],
+                settings = QUOTE_SETTINGS[quoteOption],
+                avoidEscape = context.options[1] === AVOID_ESCAPE,
+                isValid;
+
+            if (settings && typeof val === "string") {
+                isValid = isJSXElement(node.parent) || isSurroundedBy(rawVal, settings.quote);
+
+                if (!isValid && avoidEscape) {
+                    isValid = isSurroundedBy(rawVal, settings.alternateQuote) && rawVal.indexOf(settings.quote) >= 0;
+                }
+
+                if (!isValid) {
+                    context.report(node, "Strings must use " + settings.description + ".");
+                }
+            }
+        }
+    };
+
+};