Add state_mutability to ABI.FunctionSelector

lib/abi/function_selector.ex

@@ -40,6 +40,7 @@ defmodule ABI.FunctionSelector do
           types: [type],
           returns: [type],
           type: :event | :function | :constructor | :error,
+          state_mutability: :pure | :view | :non_payable | :payable | nil,
           inputs_indexed: [boolean]
         }
 
@@ -48,6 +49,7 @@ defmodule ABI.FunctionSelector do
     :method_id,
     :type,
     :inputs_indexed,
+    :state_mutability,
     input_names: [],
     types: [],
     returns: []
@@ -66,6 +68,13 @@ defmodule ABI.FunctionSelector do
     "tuple"
   ]
 
+  @state_mutability %{
+    "pure" => :pure,
+    "view" => :view,
+    "nonPayable" => :non_payable,
+    "payable" => :payable
+  }
+
   @doc """
   Decodes a function selector to a struct.
 
@@ -181,6 +190,7 @@ defmodule ABI.FunctionSelector do
         types: input_types,
         returns: output_types,
         input_names: input_names,
+        state_mutability: @state_mutability[item["stateMutability"]],
         type: :function
       }
 

test/abi/function_selector_test.exs

@@ -105,7 +105,8 @@ defmodule ABI.FunctionSelectorTest do
                  method_id: <<33, 173, 158, 39>>,
                  returns: [uint: 256],
                  type: :function,
-                 types: [array: {:array, {:tuple, [uint: 256, uint: 256]}}]
+                 types: [array: {:array, {:tuple, [uint: 256, uint: 256]}}],
+                 state_mutability: :payable
                }
              ] == ABI.parse_specification([abi])
     end
@@ -342,6 +343,26 @@ defmodule ABI.FunctionSelectorTest do
 
       assert expected_type == selector.types
     end
+
+    test "with stateMutability set" do
+      ~w(pure view nonPayable payable)
+      |> Enum.zip(~w(pure view non_payable payable)a)
+      |> Enum.each(fn {state_mutability, state_mutability_atom} ->
+        function = %{
+          "inputs" => [
+            %{"internalType" => "uint160[]", "name" => "exitIds", "type" => "uint160[]"}
+          ],
+          "name" => "standardExits",
+          "outputs" => [],
+          "payable" => false,
+          "stateMutability" => state_mutability,
+          "type" => "function"
+        }
+
+        assert %FunctionSelector{state_mutability: ^state_mutability_atom} =
+                 FunctionSelector.parse_specification_item(function)
+      end)
+    end
   end
 
   describe "simple_types?/1" do