Support multidimensional tuple arrays

[eruizgar91]

Currently there are not support for multidimensional tuple arrays, so when an abi contents a type like this tuple[][] is trying to parse it as if having a fixed length https://github.com/poanetwork/ex_abi/blob/master/lib/abi/function_selector.ex#L318 and generating an error.

It's posible to reproduce running this test:

test "parse multidimensional tuple" do
      abi = %{
        "constant" => true,
        "inputs" => [%{"name" => "swaps", "type" => "tuple[][]", "interalType" => "struct ExchangeProxy.Swap[][]", "components" => [
          %{
            "name" => "foo",
            "type" => "uint256"
          },
          %{
            "name" => "bar",
            "type" => "uint256"
          }
        ]}],
        "name" => "batchSwapExactOut",
        "outputs" => [%{"name" => "totalAmountIn", "type" => "uint256"}],
        "payable" => true,
        "stateMutability" => "payable",
        "type" => "function"
      }

      IO.inspect(ABI.parse_specification([abi])) 
    end

The error produced is:

  1) test parse multidimensional tuple (Explorer.SmartContract.ReaderTest)
     apps/explorer/test/explorer/smart_contract/reader_test.exs:385
     ** (ArgumentError) errors were found at the given arguments:
     
       * 1st argument: not a textual representation of an integer
     
     code: IO.inspect(ABI.parse_specification([abi]))
     stacktrace:
       :erlang.binary_to_integer("[")
       (ex_abi 0.5.9) lib/abi/function_selector.ex:318: ABI.FunctionSelector.parse_specification_type/1
       (elixir 1.12.3) lib/enum.ex:1582: Enum."-map/2-lists^map/1-0-"/2
       (ex_abi 0.5.9) lib/abi/function_selector.ex:174: ABI.FunctionSelector.parse_specification_item/1
       (elixir 1.12.3) lib/enum.ex:1582: Enum."-map/2-lists^map/1-0-"/2
       (ex_abi 0.5.9) lib/abi.ex:198: ABI.parse_specification/2
       test/explorer/smart_contract/reader_test.exs:405: (test)

[ayrat555]

@eruizgar91 hello can you please check if https://github.com/poanetwork/ex_abi/pull/89/files works for you

[eruizgar91]

Yes @ayrat555 , it's working fine! Waiting for a new release. Thank you.