mojom: Add associative arrays to the mojom language.

mojo/public/tools/bindings/generators/mojom_cpp_generator.py

Index: mojo/public/tools/bindings/generators/mojom_cpp_generator.py
diff --git a/mojo/public/tools/bindings/generators/mojom_cpp_generator.py b/mojo/public/tools/bindings/generators/mojom_cpp_generator.py
index e5f5e9de9dff0059181dedfbf5699552aa2461e0..9e62ec5a867910252e7e9b605677a5486558c722 100644
--- a/mojo/public/tools/bindings/generators/mojom_cpp_generator.py
+++ b/mojo/public/tools/bindings/generators/mojom_cpp_generator.py
@@ -92,6 +92,9 @@ def GetCppArrayArgWrapperType(kind):
     return "%sPtr" % GetNameForKind(kind)
   if mojom.IsAnyArrayKind(kind):
     return "mojo::Array<%s> " % GetCppArrayArgWrapperType(kind.kind)
+  if mojom.IsMapKind(kind):
+    return "mojo::Map<%s, %s> " % (GetCppArrayArgWrapperType(kind.key_kind),
+                                   GetCppArrayArgWrapperType(kind.value_kind))
   if mojom.IsInterfaceKind(kind):
     raise Exception("Arrays of interfaces not yet supported!")
   if mojom.IsInterfaceRequestKind(kind):
@@ -117,6 +120,9 @@ def GetCppResultWrapperType(kind):
     return "%sPtr" % GetNameForKind(kind)
   if mojom.IsAnyArrayKind(kind):
     return "mojo::Array<%s>" % GetCppArrayArgWrapperType(kind.kind)
+  if mojom.IsMapKind(kind):
+    return "mojo::Map<%s, %s>" % (GetCppArrayArgWrapperType(kind.key_kind),
+                                  GetCppArrayArgWrapperType(kind.value_kind))
   if mojom.IsInterfaceKind(kind):
     return "%sPtr" % GetNameForKind(kind)
   if mojom.IsInterfaceRequestKind(kind):
@@ -142,6 +148,9 @@ def GetCppWrapperType(kind):
     return "%sPtr" % GetNameForKind(kind)
   if mojom.IsAnyArrayKind(kind):
     return "mojo::Array<%s>" % GetCppArrayArgWrapperType(kind.kind)
+  if mojom.IsMapKind(kind):
+    return "mojo::Map<%s, %s>" % (GetCppArrayArgWrapperType(kind.key_kind),
+                                  GetCppArrayArgWrapperType(kind.value_kind))
   if mojom.IsInterfaceKind(kind):
     return "%sPtr" % GetNameForKind(kind)
   if mojom.IsInterfaceRequestKind(kind):
@@ -165,6 +174,9 @@ def GetCppConstWrapperType(kind):
     return "%sPtr" % GetNameForKind(kind)
   if mojom.IsAnyArrayKind(kind):
     return "mojo::Array<%s>" % GetCppArrayArgWrapperType(kind.kind)
+  if mojom.IsMapKind(kind):
+    return "mojo::Map<%s, %s>" % (GetCppArrayArgWrapperType(kind.key_kind),
+                                  GetCppArrayArgWrapperType(kind.value_kind))
   if mojom.IsInterfaceKind(kind):
     return "%sPtr" % GetNameForKind(kind)
   if mojom.IsInterfaceRequestKind(kind):
@@ -268,6 +280,14 @@ def GetArrayValidateParams(kind):
       'true' if element_is_nullable else 'false',
       element_validate_params)
 
+def GetMapValidateParams(kind):
+  # Unlike GetArrayValidateParams, we are given the wrapped kind, instead of
+  # the raw array kind. So we wrap the return value of GetArrayValidateParams.
+  element_is_nullable = mojom.IsNullableKind(kind)
+  return "mojo::internal::ArrayValidateParams<0, %s,\n%s> " % (
+      'true' if element_is_nullable else 'false',
+      GetArrayValidateParams(kind))
+
 _HEADER_SIZE = 8
 
 class Generator(generator.Generator):
@@ -284,6 +304,7 @@ class Generator(generator.Generator):
     "expected_array_size": generator.ExpectedArraySize,
     "expression_to_text": ExpressionToText,
     "get_array_validate_params": GetArrayValidateParams,
+    "get_map_validate_params": GetMapValidateParams,
     "get_name_for_kind": GetNameForKind,
     "get_pad": pack.GetPad,
     "has_callbacks": mojom.HasCallbacks,
@@ -294,6 +315,7 @@ class Generator(generator.Generator):
     "is_any_handle_kind": mojom.IsAnyHandleKind,
     "is_interface_kind": mojom.IsInterfaceKind,
     "is_interface_request_kind": mojom.IsInterfaceRequestKind,
+    "is_map_kind": mojom.IsMapKind,
     "is_nullable_kind": mojom.IsNullableKind,
     "is_object_kind": mojom.IsObjectKind,
     "is_string_kind": mojom.IsStringKind,