Fixed issue #36 - escape quotes in string.

Author: owensd

src/JSValue.swift

@@ -245,7 +245,8 @@ extension JSValue {
             return "\(number)"
 
         case .JSString(let string):
-            return "\"\(string)\""
+            let escaped = string.stringByReplacingOccurrencesOfString("\"", withString: "\\\"")
+            return "\"\(escaped)\""
 
         case .JSArray(let array):
             return "[\(newline)" + join(",\(newline)", array.map({ "\(nextIndent)\($0.prettyPrint(indent, level + 1))" })) + "\(newline)\(currentIndent)]"

tests/JSValueTests.Parsing.swift

@@ -393,4 +393,14 @@ class JSValueParsingTests : XCTestCase {
         let json = JSON.parse(string as! String)
         XCTAssertTrue(json.error == nil, json.error?.userInfo?.description ?? "No error message found")
     }
+    
+    func testStringifyEscaping() {
+        var json: JSON = [
+            "url" : "should escape double quotes \""
+        ]
+    
+        let str = json.stringify(0)
+        let expected = "{\"url\":\"should escape double quotes \\\"\"}"
+        XCTAssertEqual(str, expected)
+    }
 }