Implement USVString.

components/script/dom/bindings/codegen/CodegenRust.py

@@ -717,6 +717,32 @@ def getJSToNativeConversionInfo(type, descriptorProvider, failureCode=None,
 
         return handleOptional(conversionCode, CGGeneric(declType), default)
 
+    if type.isUSVString():
+        assert not isEnforceRange and not isClamp
+
+        conversionCode = (
+            "match FromJSValConvertible::from_jsval(cx, ${val}, ()) {\n"
+            "    Ok(strval) => strval,\n"
+            "    Err(_) => { %s },\n"
+            "}" % exceptionCode)
+
+        if defaultValue is None:
+            default = None
+        elif isinstance(defaultValue, IDLNullValue):
+            assert type.nullable()
+            default = "None"
+        else:
+            assert defaultValue.type.tag() in (IDLType.Tags.domstring, IDLType.Tags.usvstring)
+            default = 'USVString("%s".to_owned())' % defaultValue.value
+            if type.nullable():
+                default = "Some(%s)" % default
+
+        declType = "USVString"
+        if type.nullable():
+            declType = "Option<%s>" % declType
+
+        return handleOptional(conversionCode, CGGeneric(declType), default)
+
     if type.isByteString():
         assert not isEnforceRange and not isClamp
 
@@ -1086,6 +1112,11 @@ def getRetvalDeclarationForType(returnType, descriptorProvider):
         if returnType.nullable():
             result = CGWrapper(result, pre="Option<", post=">")
         return result
+    if returnType.isUSVString():
+        result = CGGeneric("USVString")
+        if returnType.nullable():
+            result = CGWrapper(result, pre="Option<", post=">")
+        return result
     if returnType.isByteString():
         result = CGGeneric("ByteString")
         if returnType.nullable():
@@ -4647,6 +4678,7 @@ class CGBindingRoot(CGThing):
             'dom::bindings::proxyhandler::{fill_property_descriptor, get_expando_object}',
             'dom::bindings::proxyhandler::{get_property_descriptor}',
             'dom::bindings::str::ByteString',
+            'dom::bindings::str::USVString',
             'libc',
             'util::str::DOMString',
             'std::borrow::ToOwned',

components/script/dom/bindings/conversions.rs

@@ -19,6 +19,7 @@
 //! | float                   | `f32`                            |
 //! | double                  | `f64`                            |
 //! | DOMString               | `DOMString`                      |
+//! | USVString               | `USVString`                      |
 //! | ByteString              | `ByteString`                     |
 //! | object                  | `*mut JSObject`                  |
 //! | interface types         | `JSRef<T>`      | `Temporary<T>` |
@@ -31,7 +32,7 @@
 
 use dom::bindings::codegen::PrototypeList;
 use dom::bindings::js::{JSRef, Root, Unrooted};
-use dom::bindings::str::ByteString;
+use dom::bindings::str::{ByteString, USVString};
 use dom::bindings::utils::{Reflectable, Reflector, DOMClass};
 use util::str::DOMString;
 
@@ -339,6 +340,31 @@ impl FromJSValConvertible for DOMString {
     }
 }
 
+impl ToJSValConvertible for USVString {
+    fn to_jsval(&self, cx: *mut JSContext) -> JSVal {
+        self.0.to_jsval(cx)
+    }
+}
+
+impl FromJSValConvertible for USVString {
+    type Config = ();
+    fn from_jsval(cx: *mut JSContext, value: JSVal, _: ())
+                  -> Result<USVString, ()> {
+        let jsstr = unsafe { JS_ValueToString(cx, value) };
+        if jsstr.is_null() {
+            debug!("JS_ValueToString failed");
+            Err(())
+        } else {
+            unsafe {
+                let mut length = 0;
+                let chars = JS_GetStringCharsAndLength(cx, jsstr, &mut length);
+                let char_vec = slice::from_raw_parts(chars, length as usize);
+                Ok(USVString(String::from_utf16_lossy(char_vec)))
+            }
+        }
+    }
+}
+
 impl ToJSValConvertible for ByteString {
     fn to_jsval(&self, cx: *mut JSContext) -> JSVal {
         unsafe {

components/script/dom/bindings/str.rs

@@ -157,3 +157,7 @@ impl FromStr for ByteString {
         Ok(ByteString::new(s.to_owned().into_bytes()))
     }
 }
+
+/// A string that is constructed from a UCS-2 buffer by replacing invalid code
+/// points with the replacement character.
+pub struct USVString(pub String);