webidl: Implement sequences in unions

Unblocks #9053

3 files changed, 41 insertions, 20 deletions

diff --git a/components/script/dom/bindings/codegen/CodegenRust.py b/components/script/dom/bindings/codegen/CodegenRust.py
index 2a04db77cc9..643c396febc 100644
--- a/components/script/dom/bindings/codegen/CodegenRust.py
+++ b/components/script/dom/bindings/codegen/CodegenRust.py
@@ -1221,7 +1221,7 @@ def getConversionConfigForType(type, isEnforceRange, isClamp, treatNullAs):
             return "StringificationBehavior::Default"
         else:
             return treatAs[treatNullAs]
-    if type.isInteger():
+    if type.isPrimitive() and type.isInteger():
         if isEnforceRange:
             return "ConversionBehavior::EnforceRange"
         elif isClamp:
@@ -3571,8 +3571,8 @@ def getUnionTypeTemplateVars(type, descriptorProvider):
     # for getJSToNativeConversionInfo.
     # Also, for dictionaries we would need to handle conversion of
     # null/undefined to the dictionary correctly.
-    if type.isDictionary() or type.isSequence():
-        raise TypeError("Can't handle dictionaries or sequences in unions")
+    if type.isDictionary():
+        raise TypeError("Can't handle dictionaries in unions")
 
     if type.isGeckoInterface():
         name = type.inner.identifier.name
@@ -3580,7 +3580,11 @@ def getUnionTypeTemplateVars(type, descriptorProvider):
     elif type.isEnum():
         name = type.inner.identifier.name
         typeName = name
-    elif type.isArray() or type.isSequence():
+    elif type.isSequence():
+        name = type.name
+        inner = getUnionTypeTemplateVars(type.unroll(), descriptorProvider)
+        typeName = "Vec<" + inner["typeName"] + ">"
+    elif type.isArray():
         name = str(type)
         # XXXjdm dunno about typeName here
         typeName = "/*" + type.name + "*/"
@@ -3664,22 +3668,22 @@ class CGUnionConversionStruct(CGThing):
         names = []
         conversions = []
 
-        interfaceMemberTypes = filter(lambda t: t.isNonCallbackInterface(), memberTypes)
-        if len(interfaceMemberTypes) > 0:
-            def get_name(memberType):
-                if self.type.isGeckoInterface():
-                    return memberType.inner.identifier.name
+        def get_name(memberType):
+            if self.type.isGeckoInterface():
+                return memberType.inner.identifier.name
 
-                return memberType.name
+            return memberType.name
 
-            def get_match(name):
-                return (
-                    "match %s::TryConvertTo%s(cx, value) {\n"
-                    "    Err(_) => return Err(()),\n"
-                    "    Ok(Some(value)) => return Ok(%s::e%s(value)),\n"
-                    "    Ok(None) => (),\n"
-                    "}\n") % (self.type, name, self.type, name)
+        def get_match(name):
+            return (
+                "match %s::TryConvertTo%s(cx, value) {\n"
+                "    Err(_) => return Err(()),\n"
+                "    Ok(Some(value)) => return Ok(%s::e%s(value)),\n"
+                "    Ok(None) => (),\n"
+                "}\n") % (self.type, name, self.type, name)
 
+        interfaceMemberTypes = filter(lambda t: t.isNonCallbackInterface(), memberTypes)
+        if len(interfaceMemberTypes) > 0:
             typeNames = [get_name(memberType) for memberType in interfaceMemberTypes]
             interfaceObject = CGList(CGGeneric(get_match(typeName)) for typeName in typeNames)
             names.extend(typeNames)
@@ -3689,7 +3693,9 @@ class CGUnionConversionStruct(CGThing):
         arrayObjectMemberTypes = filter(lambda t: t.isArray() or t.isSequence(), memberTypes)
         if len(arrayObjectMemberTypes) > 0:
             assert len(arrayObjectMemberTypes) == 1
-            raise TypeError("Can't handle arrays or sequences in unions.")
+            typeName = arrayObjectMemberTypes[0].name
+            arrayObject = CGGeneric(get_match(typeName))
+            names.append(typeName)
         else:
             arrayObject = None
 
@@ -3727,8 +3733,12 @@ class CGUnionConversionStruct(CGThing):
 
         hasObjectTypes = interfaceObject or arrayObject or dateObject or nonPlatformObject or object
         if hasObjectTypes:
-            assert interfaceObject
-            templateBody = CGList([interfaceObject], "\n")
+            assert interfaceObject or arrayObject
+            templateBody = CGList([], "\n")
+            if interfaceObject:
+                templateBody.append(interfaceObject)
+            if arrayObject:
+                templateBody.append(arrayObject)
             conversions.append(CGIfWrapper("value.get().is_object()", templateBody))
 
         otherMemberTypes = [
diff --git a/components/script/dom/testbinding.rs b/components/script/dom/testbinding.rs
index 687d68a5eb9..473f96f5704 100644
--- a/components/script/dom/testbinding.rs
+++ b/components/script/dom/testbinding.rs
@@ -9,6 +9,7 @@ use dom::bindings::codegen::Bindings::FunctionBinding::Function;
 use dom::bindings::codegen::Bindings::TestBindingBinding::{self, TestBindingMethods, TestEnum};
 use dom::bindings::codegen::UnionTypes::{BlobOrString, EventOrString};
 use dom::bindings::codegen::UnionTypes::{EventOrUSVString, HTMLElementOrLong};
+use dom::bindings::codegen::UnionTypes::{StringOrLongSequence, StringOrStringSequence};
 use dom::bindings::error::Fallible;
 use dom::bindings::global::GlobalRef;
 use dom::bindings::js::Root;
@@ -188,6 +189,8 @@ impl TestBindingMethods for TestBinding {
     fn ReceiveObject(&self, _: *mut JSContext) -> *mut JSObject { panic!() }
     fn ReceiveUnion(&self) -> HTMLElementOrLong { HTMLElementOrLong::eLong(0) }
     fn ReceiveUnion2(&self) -> EventOrString { EventOrString::eString(DOMString::new()) }
+    fn ReceiveUnion3(&self) -> StringOrLongSequence { StringOrLongSequence::eLongSequence(vec![]) }
+    fn ReceiveUnion4(&self) -> StringOrStringSequence { StringOrStringSequence::eStringSequence(vec![]) }
     fn ReceiveSequence(&self) -> Vec<i32> { vec![1] }
 
     fn ReceiveNullableBoolean(&self) -> Option<bool> { Some(false) }
@@ -217,6 +220,9 @@ impl TestBindingMethods for TestBinding {
     fn ReceiveNullableUnion2(&self) -> Option<EventOrString> {
         Some(EventOrString::eString(DOMString::new()))
     }
+    fn ReceiveNullableUnion3(&self) -> Option<StringOrLongSequence> {
+        Some(StringOrLongSequence::eString(DOMString::new()))
+    }
     fn ReceiveNullableSequence(&self) -> Option<Vec<i32>> { Some(vec![1]) }
 
     fn PassBoolean(&self, _: bool) {}
@@ -240,6 +246,7 @@ impl TestBindingMethods for TestBinding {
     fn PassUnion(&self, _: HTMLElementOrLong) {}
     fn PassUnion2(&self, _: EventOrString) {}
     fn PassUnion3(&self, _: BlobOrString) {}
+    fn PassUnion4(&self, _: StringOrStringSequence) {}
     fn PassAny(&self, _: *mut JSContext, _: HandleValue) {}
     fn PassObject(&self, _: *mut JSContext, _: *mut JSObject) {}
     fn PassCallbackFunction(&self, _: Rc<Function>) {}
diff --git a/components/script/dom/webidls/TestBinding.webidl b/components/script/dom/webidls/TestBinding.webidl
index 7934182621e..ee3250427fe 100644
--- a/components/script/dom/webidls/TestBinding.webidl
+++ b/components/script/dom/webidls/TestBinding.webidl
@@ -149,6 +149,8 @@ interface TestBinding {
   object receiveObject();
   (HTMLElement or long) receiveUnion();
   (Event or DOMString) receiveUnion2();
+  (DOMString or sequence<long>) receiveUnion3();
+  (DOMString or sequence<DOMString>) receiveUnion4();
   sequence<long> receiveSequence();
 
   byte? receiveNullableByte();
@@ -172,6 +174,7 @@ interface TestBinding {
   object? receiveNullableObject();
   (HTMLElement or long)? receiveNullableUnion();
   (Event or DOMString)? receiveNullableUnion2();
+  (DOMString or sequence<long>)? receiveNullableUnion3();
   sequence<long>? receiveNullableSequence();
 
   void passBoolean(boolean arg);
@@ -195,6 +198,7 @@ interface TestBinding {
   void passUnion((HTMLElement or long) arg);
   void passUnion2((Event or DOMString) data);
   void passUnion3((Blob or DOMString) data);
+  void passUnion4((DOMString or sequence<DOMString>) seq);
   void passAny(any arg);
   void passObject(object arg);
   void passCallbackFunction(Function fun);