Implement TextDecoder (fixes #4769).

components/script/dom/textdecoder.rs

@@ -0,0 +1,65 @@
+/* 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::codegen::Bindings::TextDecoderBinding;
+use dom::bindings::codegen::Bindings::TextDecoderBinding::TextDecoderMethods;
+use dom::bindings::error::{Error, Fallible};
+use dom::bindings::global::GlobalRef;
+use dom::bindings::js::{JSRef, Temporary};
+use dom::bindings::trace::JSTraceable;
+use dom::bindings::utils::{Reflector, reflect_dom_object};
+
+use util::str::DOMString;
+
+use encoding::Encoding;
+use encoding::types::EncodingRef;
+use encoding::label::encoding_from_whatwg_label;
+
+use std::borrow::ToOwned;
+
+#[dom_struct]
+pub struct TextDecoder {
+    reflector_: Reflector,
+    encoding: EncodingRef,
+    fatal: bool,
+}
+
+impl TextDecoder {
+    fn new_inherited(encoding: EncodingRef, fatal: bool) -> TextDecoder {
+        TextDecoder {
+            reflector_: Reflector::new(),
+            encoding: encoding,
+            fatal: fatal,
+        }
+    }
+
+    pub fn new(global: GlobalRef, encoding: EncodingRef, fatal: bool) -> Temporary<TextDecoder> {
+        reflect_dom_object(box TextDecoder::new_inherited(encoding, fatal),
+                           global,
+                           TextDecoderBinding::Wrap)
+    }
+
+    /// https://encoding.spec.whatwg.org/#dom-textdecoder
+    pub fn Constructor(global: GlobalRef,
+                       label: DOMString,
+                       options: &TextDecoderBinding::TextDecoderOptions)
+                            -> Fallible<Temporary<TextDecoder>> {
+        let encoding = match encoding_from_whatwg_label(&label) {
+            Some(enc) => enc,
+            // FIXME: Should throw a RangeError as per spec
+            None => return Err(Error::Syntax),
+        };
+        Ok(TextDecoder::new(global, encoding, options.fatal))
+    }
+}
+
+impl<'a> TextDecoderMethods for JSRef<'a, TextDecoder> {
+    fn Encoding(self) -> DOMString {
+        self.encoding.whatwg_name().unwrap().to_owned()
+    }
+
+    fn Fatal(self) -> bool {
+        self.fatal
+    }
+}