Implement WebIDL method overloads. Fixes #540.

src/components/script/dom/formdata.rs

@@ -0,0 +1,38 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+use dom::bindings::utils::{WrapperCache, DOMString, str};
+use dom::blob::Blob;
+use std::hashmap::HashMap;
+
+enum FormDatum {
+    StringData(DOMString),
+    BlobData { blob: @mut Blob, name: DOMString }
+}
+
+pub struct FormData {
+    data: HashMap<~str, FormDatum>,
+    wrapper: WrapperCache
+}
+
+impl FormData {
+    pub fn new() -> @mut FormData {
+        @mut FormData {
+            data: HashMap::new(),
+            wrapper: WrapperCache::new()
+        }
+    }
+
+    pub fn Append(&mut self, name: DOMString, value: @mut Blob, filename: Option<DOMString>) {
+        let blob = BlobData {
+            blob: value,
+            name: filename.get_or_default(str(~"default"))
+        };
+        self.data.insert(name.to_str(), blob);
+    }
+
+    pub fn Append_(&mut self, name: DOMString, value: DOMString) {
+        self.data.insert(name.to_str(), StringData(value));
+    }
+}