Generic ast (#1829)

Remove dependency on yaml.Node for internal AST representation. Yaml decoder is now just another decoder.

pkg/yqlib/toml_test.go

@@ -94,6 +94,30 @@ var tomlScenarios = []formatScenario{
 		expected:     "person:\n  name: hello\n  address: 12 cat st\n",
 		scenarioType: "decode",
 	},
+	{
+		skipDoc:      true,
+		description:  "Parse: include key information",
+		input:        "person.name = \"hello\"\nperson.address = \"12 cat st\"\n",
+		expression:   ".person.name | key",
+		expected:     "name\n",
+		scenarioType: "roundtrip",
+	},
+	{
+		skipDoc:      true,
+		description:  "Parse: include parent information",
+		input:        "person.name = \"hello\"\nperson.address = \"12 cat st\"\n",
+		expression:   ".person.name | parent",
+		expected:     "name: hello\naddress: 12 cat st\n",
+		scenarioType: "decode",
+	},
+	{
+		skipDoc:      true,
+		description:  "Parse: include path information",
+		input:        "person.name = \"hello\"\nperson.address = \"12 cat st\"\n",
+		expression:   ".person.name | path",
+		expected:     "- person\n- name\n",
+		scenarioType: "decode",
+	},
 	{
 		description:  "Encode: Scalar",
 		input:        "person.name = \"hello\"\nperson.address = \"12 cat st\"\n",