add support for decoding binary extension arrays

abidecoder.go

@@ -400,6 +400,10 @@ func (a *ABI) read(binaryDecoder *Decoder, fieldType string) (interface{}, error
 }
 
 func analyzeFieldType(fieldType string) (typeName string, isOptional bool, isArray bool, isBinaryExtension bool) {
+	if strings.HasSuffix(fieldType, "[]$") {
+		return fieldType[0 : len(fieldType)-3], false, true, true
+	}
+
 	if strings.HasSuffix(fieldType, "?") {
 		return fieldType[0 : len(fieldType)-1], true, false, false
 	}

abidecoder_test.go

@@ -850,6 +850,30 @@ func TestABI_decode_BinaryExtension(t *testing.T) {
 	assert.JSONEq(t, `{"id":0,"name":"name"}`, string(json))
 }
 
+func TestABI_decode_BinaryExtensionArray(t *testing.T) {
+	abi := &ABI{
+		Structs: []StructDef{
+			{
+				Name: "root",
+				Fields: []FieldDef{
+					{Name: "id", Type: "uint8"},
+					{Name: "name", Type: "name[]$"},
+				},
+			},
+		},
+	}
+
+	json, err := abi.Decode(NewDecoder(HexString("00")), "root")
+	require.NoError(t, err)
+
+	assert.JSONEq(t, `{"id":0}`, string(json))
+
+	json, err = abi.Decode(NewDecoder(HexString("00010000000000a0a499")), "root")
+	require.NoError(t, err)
+
+	assert.JSONEq(t, `{"id":0,"name":["name"]}`, string(json))
+}
+
 func TestABI_decodeFields(t *testing.T) {
 	types := []ABIType{
 		{NewTypeName: "action.type.1", Type: "name"},