Add JSON data related struct and function into context. am: 20f19a5d9b am: d7fda94073 am: 5d6e46e687

Original change: https://android-review.googlesource.com/c/platform/build/blueprint/+/1942213

Change-Id: I41c304f46ce6be200bcdb69bf7a696f1978c057b

context.go

@@ -2300,6 +2300,26 @@ type JSONDataSupplier interface {
 	AddJSONData(d *map[string]interface{})
 }
 
+// A JSONDataAction contains the inputs and outputs of actions of a module. Which helps pass such
+// data to be included in the JSON module graph.
+type JSONDataAction struct {
+	Inputs  []string
+	Outputs []string
+}
+
+// FormatJSONDataActions puts the content of a list of JSONDataActions into a standard format to be
+// appended into the JSON module graph.
+func FormatJSONDataActions(jsonDataActions []JSONDataAction) []map[string]interface{} {
+	var actions []map[string]interface{}
+	for _, jsonDataAction := range jsonDataActions {
+		actions = append(actions, map[string]interface{}{
+			"Inputs":  jsonDataAction.Inputs,
+			"Outputs": jsonDataAction.Outputs,
+		})
+	}
+	return actions
+}
+
 func jsonModuleFromModuleInfo(m *moduleInfo) *JsonModule {
 	result := &JsonModule{
 		jsonModuleName: *jsonModuleNameFromModuleInfo(m),

context_test.go

@@ -607,6 +607,39 @@ func TestParseFailsForModuleWithoutName(t *testing.T) {
 	}
 }
 
+func TestFormatJSONDataActions(t *testing.T) {
+	inputs := []string{"fake/input/1", "fake/input/2"}
+	outputs := []string{"fake/output/1", "fake/output/2"}
+	jsonDataActionEmptyInputs := JSONDataAction{
+		Outputs: outputs,
+	}
+	jsonDataActionEmptyOutputs := JSONDataAction{
+		Inputs: inputs,
+	}
+	jsonDataAction := JSONDataAction{
+		Inputs:  inputs,
+		Outputs: outputs,
+	}
+	formatData := FormatJSONDataActions([]JSONDataAction{
+		jsonDataActionEmptyInputs, jsonDataActionEmptyOutputs, jsonDataAction})
+	if fmt.Sprint(formatData) != fmt.Sprint([]map[string]interface{}{
+		map[string]interface{}{
+			"Inputs":  []string{},
+			"Outputs": outputs,
+		},
+		map[string]interface{}{
+			"Inputs":  inputs,
+			"Outputs": []string{},
+		},
+		map[string]interface{}{
+			"Inputs":  inputs,
+			"Outputs": outputs,
+		},
+	}) {
+		t.Errorf("The formatted JSON data %s isn't expected.", formatData)
+	}
+}
+
 func Test_findVariant(t *testing.T) {
 	module := &moduleInfo{
 		variant: variant{