Replace jsval_to_str and jsval_to_domstring with a FromJSValConvertible implementation.

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

@@ -1020,30 +1020,29 @@ for (uint32_t i = 0; i < length; ++i) {
         }
         if treatNullAs not in treatAs:
             raise TypeError("We don't support [TreatNullAs=%s]" % treatNullAs)
+        if type.nullable():
+            nullBehavior = "()"
+        else:
             nullBehavior = treatAs[treatNullAs]
 
-        def getConversionCode(varName, isOptional=False):
+        def getConversionCode(isOptional=False):
             strval = "strval"
             if isOptional:
                 strval = "Some(%s)" % strval
-            if type.nullable():
-                call = "jsval_to_domstring(cx, ${val})"
-            else:
-                call = "jsval_to_str(cx, ${val}, %s)" % nullBehavior
+
             conversionCode = (
-                "let strval = %s;\n"
-                "if strval.is_err() {\n"
-                "  return 0;\n"
-                "}\n"
-                "let strval = strval.unwrap();\n"
-                "%s = %s;" % (call, varName, strval))
+                "match FromJSValConvertible::from_jsval(cx, ${val}, %s) {\n"
+                "  Ok(strval) => ${declName} = %s,\n"
+                "  Err(_) => return 0,\n"
+                "}" % (nullBehavior, strval))
+
             if defaultValue is None:
                 return conversionCode
 
             if isinstance(defaultValue, IDLNullValue):
                 assert(type.nullable())
                 return handleDefault(conversionCode,
-                                     "%s.SetNull()" % varName)
+                                     "${declName}.SetNull()")
 
             value = "str::from_utf8(data).to_owned()"
             if type.nullable():
@@ -1051,10 +1050,10 @@ for (uint32_t i = 0; i < length; ++i) {
 
             default = (
                 "static data: [u8, ..%s] = [ %s ];\n"
-                "%s = %s" %
+                "${declName} = %s" %
                 (len(defaultValue.value) + 1,
                  ", ".join(["'" + char + "' as u8" for char in defaultValue.value] + ["0"]),
-                 varName, value))
+                 value))
 
             return handleDefault(conversionCode, default)
 
@@ -1062,7 +1061,7 @@ for (uint32_t i = 0; i < length; ++i) {
             # We have to make a copy, because our jsval may well not
             # live as long as our string needs to.
             declType = CGGeneric("DOMString")
-            return ("%s\n" % getConversionCode("${declName}"),
+            return ("%s\n" % getConversionCode(),
                     declType, None, isOptional, None)
 
         declType = "DOMString"
@@ -1076,8 +1075,7 @@ for (uint32_t i = 0; i < length; ++i) {
 
         return (
             "%s\n" %
-            #"const_cast<%s&>(${declName}) = &${holderName};" %
-            (getConversionCode("${declName}", isOptional)),
+            (getConversionCode(isOptional)),
             CGGeneric(declType), None, #CGGeneric("FakeDependentString"),
             False,
             initialValue)
@@ -5255,11 +5253,11 @@ class CGBindingRoot(CGThing):
                           'dom::bindings::utils::{CreateDOMGlobal, CreateInterfaceObjects2}',
                           'dom::bindings::utils::{ConstantSpec, cx_for_dom_object, Default}',
                           'dom::bindings::utils::{dom_object_slot, DOM_OBJECT_SLOT, DOMClass}',
-                          'dom::bindings::utils::{DOMJSClass, Empty}',
+                          'dom::bindings::utils::{DOMJSClass}',
                           'dom::bindings::utils::{FindEnumStringIndex, GetArrayIndexFromId}',
                           'dom::bindings::utils::{GetPropertyOnPrototype, GetProtoOrIfaceArray}',
                           'dom::bindings::utils::{GetReflector, HasPropertyOnPrototype, IntVal}',
-                          'dom::bindings::utils::{jsid_to_str, jsval_to_domstring, jsval_to_str}',
+                          'dom::bindings::utils::{jsid_to_str}',
                           'dom::bindings::utils::{NativePropertyHooks}',
                           'dom::bindings::utils::global_object_for_js_object',
                           'dom::bindings::utils::{Reflectable}',
@@ -5272,6 +5270,7 @@ class CGBindingRoot(CGThing):
                           'dom::bindings::callback::{CallSetup,ExceptionHandling}',
                           'dom::bindings::callback::{WrapCallThisObject}',
                           'dom::bindings::conversions::{FromJSValConvertible, ToJSValConvertible}',
+                          'dom::bindings::conversions::{Default, Empty}',
                           'dom::bindings::codegen::*',
                           'dom::bindings::codegen::UnionTypes::*',
                           'dom::bindings::codegen::UnionConversions::*',

src/components/script/dom/bindings/conversions.rs

@@ -2,13 +2,14 @@
  * 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::jsstring_to_str;
 use servo_util::str::DOMString;
 
 use js::jsapi::{JSBool, JSContext};
 use js::jsapi::{JS_ValueToUint64, JS_ValueToInt64};
 use js::jsapi::{JS_ValueToECMAUint32, JS_ValueToECMAInt32};
 use js::jsapi::{JS_ValueToUint16, JS_ValueToNumber, JS_ValueToBoolean};
-use js::jsapi::{JS_NewUCStringCopyN};
+use js::jsapi::{JS_NewUCStringCopyN, JS_ValueToString};
 use js::jsval::JSVal;
 use js::jsval::{NullValue, BooleanValue, Int32Value, UInt32Value, StringValue};
 use js::glue::RUST_JS_NumberValue;
@@ -193,6 +194,34 @@ impl ToJSValConvertible for DOMString {
     }
 }
 
+#[deriving(Eq)]
+pub enum StringificationBehavior {
+    Default,
+    Empty,
+}
+
+impl Default for StringificationBehavior {
+    fn default() -> StringificationBehavior {
+        Default
+    }
+}
+
+impl FromJSValConvertible<StringificationBehavior> for DOMString {
+    fn from_jsval(cx: *JSContext, value: JSVal, nullBehavior: StringificationBehavior) -> Result<DOMString, ()> {
+        if nullBehavior == Empty && value.is_null() {
+            Ok(~"")
+        } else {
+            let jsstr = unsafe { JS_ValueToString(cx, value) };
+            if jsstr.is_null() {
+                debug!("JS_ValueToString failed");
+                Err(())
+            } else {
+                Ok(jsstring_to_str(cx, jsstr))
+            }
+        }
+    }
+}
+
 impl<T: ToJSValConvertible> ToJSValConvertible for Option<T> {
     fn to_jsval(&self, cx: *JSContext) -> JSVal {
         match self {

src/components/script/dom/bindings/utils.rs

@@ -161,41 +161,6 @@ pub fn jsid_to_str(cx: *JSContext, id: jsid) -> DOMString {
     }
 }
 
-#[deriving(Eq)]
-pub enum StringificationBehavior {
-    Default,
-    Empty,
-}
-
-pub fn jsval_to_str(cx: *JSContext, v: JSVal,
-                    nullBehavior: StringificationBehavior) -> Result<DOMString, ()> {
-    if v.is_null() && nullBehavior == Empty {
-        Ok(~"")
-    } else {
-        let jsstr = unsafe { JS_ValueToString(cx, v) };
-        if jsstr.is_null() {
-            debug!("JS_ValueToString failed");
-            Err(())
-        } else {
-            Ok(jsstring_to_str(cx, jsstr))
-        }
-    }
-}
-
-pub fn jsval_to_domstring(cx: *JSContext, v: JSVal) -> Result<Option<DOMString>, ()> {
-    if v.is_null_or_undefined() {
-        Ok(None)
-    } else {
-        let jsstr = unsafe { JS_ValueToString(cx, v) };
-        if jsstr.is_null() {
-            debug!("JS_ValueToString failed");
-            Err(())
-        } else {
-            Ok(Some(jsstring_to_str(cx, jsstr)))
-        }
-    }
-}
-
 // We use slot 0 for holding the raw object.  This is safe for both
 // globals and non-globals.
 pub static DOM_OBJECT_SLOT: uint = 0;