Generic ast (#1829)

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

pkg/yqlib/yaml_test.go

@@ -0,0 +1,109 @@
+package yqlib
+
+import (
+	"testing"
+
+	"github.com/mikefarah/yq/v4/test"
+)
+
+var yamlFormatScenarios = []formatScenario{
+	{
+		description: "basic - null",
+		skipDoc:     true,
+		input:       "null",
+		expected:    "null\n",
+	},
+	{
+		description: "basic - ~",
+		skipDoc:     true,
+		input:       "~",
+		expected:    "~\n",
+	},
+	{
+		description: "octal",
+		skipDoc:     true,
+		input:       "0o30",
+		expression:  "tag",
+		expected:    "!!int\n",
+	},
+	{
+		description: "basic - [null]",
+		skipDoc:     true,
+		input:       "[null]",
+		expected:    "[null]\n",
+	},
+	{
+		description: "basic - [~]",
+		skipDoc:     true,
+		input:       "[~]",
+		expected:    "[~]\n",
+	},
+	{
+		description: "basic - null map value",
+		skipDoc:     true,
+		input:       "a: null",
+		expected:    "a: null\n",
+	},
+	{
+		description: "basic - number",
+		skipDoc:     true,
+		input:       "3",
+		expected:    "3\n",
+	},
+	{
+		description: "basic - float",
+		skipDoc:     true,
+		input:       "3.1",
+		expected:    "3.1\n",
+	},
+	{
+		description: "basic - float",
+		skipDoc:     true,
+		input:       "[1, 2]",
+		expected:    "[1, 2]\n",
+	},
+}
+
+var yamlParseScenarios = []expressionScenario{
+	{
+		document: `a: hello # things`,
+		expected: []string{
+			"D0, P[], (!!map)::a: hello # things\n",
+		},
+	},
+	{
+		document:   "a: &a apple\nb: *a",
+		expression: ".b | explode(.)",
+		expected: []string{
+			"D0, P[b], (!!str)::apple\n",
+		},
+	},
+	{
+		document: `a: [1,2]`,
+		expected: []string{
+			"D0, P[], (!!map)::a: [1, 2]\n",
+		},
+	},
+	{
+		document: `a: !horse [a]`,
+		expected: []string{
+			"D0, P[], (!!map)::a: !horse [a]\n",
+		},
+	},
+}
+
+func testYamlScenario(t *testing.T, s formatScenario) {
+	test.AssertResultWithContext(t, s.expected, mustProcessFormatScenario(s, NewYamlDecoder(NewDefaultYamlPreferences()), NewYamlEncoder(2, false, ConfiguredYamlPreferences)), s.description)
+}
+
+func TestYamlParseScenarios(t *testing.T) {
+	for _, tt := range yamlParseScenarios {
+		testScenario(t, &tt)
+	}
+}
+
+func TestYamlFormatScenarios(t *testing.T) {
+	for _, tt := range yamlFormatScenarios {
+		testYamlScenario(t, tt)
+	}
+}