codegen: Move conversion behaviour to a common function

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

@@ -775,20 +775,7 @@ def wrapObjectTemplate(templateBody, nullValue, isDefinitelyObject, type,
         raise TypeError("Can't handle SpiderMonkey interface arguments yet")
 
     if type.isDOMString():
-        assert not isEnforceRange and not isClamp
-
-        treatAs = {
-            "Default": "StringificationBehavior::Default",
-            "EmptyString": "StringificationBehavior::Empty",
-        }
-        if treatNullAs not in treatAs:
-            raise TypeError("We don't support [TreatNullAs=%s]" % treatNullAs)
-        if type.nullable():
-            # Note: the actual behavior passed here doesn't matter for nullable
-            # strings.
-            nullBehavior = "StringificationBehavior::Default"
-        else:
-            nullBehavior = treatAs[treatNullAs]
+        nullBehavior = getConversionConfigForType(type, isEnforceRange, isClamp, treatNullAs)
 
         conversionCode = (
             "match FromJSValConvertible::from_jsval(cx, ${val}, %s) {\n"
@@ -1002,16 +989,7 @@ def wrapObjectTemplate(templateBody, nullValue, isDefinitelyObject, type,
     if not type.isPrimitive():
         raise TypeError("Need conversion for argument type '%s'" % str(type))
 
-    if type.isInteger():
-        if isEnforceRange:
-            conversionBehavior = "ConversionBehavior::EnforceRange"
-        elif isClamp:
-            conversionBehavior = "ConversionBehavior::Clamp"
-        else:
-            conversionBehavior = "ConversionBehavior::Default"
-    else:
-        assert not isEnforceRange and not isClamp
-        conversionBehavior = "()"
+    conversionBehavior = getConversionConfigForType(type, isEnforceRange, isClamp, treatNullAs)
 
     if failureCode is None:
         failureCode = 'return false'
@@ -1215,6 +1193,36 @@ def typeNeedsCx(type, retVal=False):
     return type.isAny() or type.isObject()
 
 
+# Returns a conversion behavior suitable for a type
+def getConversionConfigForType(type, isEnforceRange, isClamp, treatNullAs):
+    if type.isSequence():
+        return getConversionConfigForType(type.unroll(), isEnforceRange, isClamp, treatNullAs)
+    if type.isDOMString():
+        assert not isEnforceRange and not isClamp
+
+        treatAs = {
+            "Default": "StringificationBehavior::Default",
+            "EmptyString": "StringificationBehavior::Empty",
+        }
+        if treatNullAs not in treatAs:
+            raise TypeError("We don't support [TreatNullAs=%s]" % treatNullAs)
+        if type.nullable():
+            # Note: the actual behavior passed here doesn't matter for nullable
+            # strings.
+            return "StringificationBehavior::Default"
+        else:
+            return treatAs[treatNullAs]
+    if type.isInteger():
+        if isEnforceRange:
+            return "ConversionBehavior::EnforceRange"
+        elif isClamp:
+            return "ConversionBehavior::Clamp"
+        else:
+            return "ConversionBehavior::Default"
+    assert not isEnforceRange and not isClamp
+    return "()"
+
+
 # Returns a CGThing containing the type of the return value.
 def getRetvalDeclarationForType(returnType, descriptorProvider):
     if returnType is None or returnType.isVoid():