Allow build without json and xml support

cmd/utils.go

@@ -62,6 +62,9 @@ func configureDecoder(evaluateTogether bool) (yqlib.Decoder, error) {
 		return nil, err
 	}
 	yqlibDecoder, err := createDecoder(yqlibInputFormat, evaluateTogether)
+	if yqlibDecoder == nil {
+		return nil, fmt.Errorf("no support for %s input format", inputFormat)
+	}
 	return yqlibDecoder, err
 }
 
@@ -108,6 +111,9 @@ func configureEncoder() (yqlib.Encoder, error) {
 		return nil, err
 	}
 	yqlibEncoder, err := createEncoder(yqlibOutputFormat)
+	if yqlibEncoder == nil {
+		return nil, fmt.Errorf("no support for %s output format", outputFormat)
+	}
 	return yqlibEncoder, err
 }
 

pkg/yqlib/decoder_json.go

@@ -1,3 +1,5 @@
+//go:build !yq_nojson
+
 package yqlib
 
 import (

pkg/yqlib/decoder_xml.go

@@ -1,3 +1,5 @@
+//go:build !yq_noxml
+
 package yqlib
 
 import (

pkg/yqlib/encoder_json.go

@@ -1,3 +1,5 @@
+//go:build !yq_nojson
+
 package yqlib
 
 import (

pkg/yqlib/encoder_test.go

@@ -1,3 +1,5 @@
+//go:build !yq_nojson
+
 package yqlib
 
 import (

pkg/yqlib/encoder_xml.go

@@ -1,3 +1,5 @@
+//go:build !yq_noxml
+
 package yqlib
 
 import (

pkg/yqlib/json_test.go

@@ -1,3 +1,5 @@
+//go:build !yq_nojson
+
 package yqlib
 
 import (

pkg/yqlib/no_json.go

@@ -0,0 +1,11 @@
+//go:build yq_nojson
+
+package yqlib
+
+func NewJSONDecoder() Decoder {
+	return nil
+}
+
+func NewJSONEncoder(indent int, colorise bool, unwrapScalar bool) Encoder {
+	return nil
+}

pkg/yqlib/no_xml.go

@@ -0,0 +1,11 @@
+//go:build yq_noxml
+
+package yqlib
+
+func NewXMLDecoder(prefs XmlPreferences) Decoder {
+	return nil
+}
+
+func NewXMLEncoder(indent int, prefs XmlPreferences) Encoder {
+	return nil
+}

pkg/yqlib/operator_encoder_decoder.go

@@ -4,6 +4,7 @@ import (
 	"bufio"
 	"bytes"
 	"container/list"
+	"errors"
 	"regexp"
 	"strings"
 
@@ -39,6 +40,9 @@ func encodeToString(candidate *CandidateNode, prefs encoderPreferences) (string,
 	log.Debug("printing with indent: %v", prefs.indent)
 
 	encoder := configureEncoder(prefs.format, prefs.indent)
+	if encoder == nil {
+		return "", errors.New("no support for output format")
+	}
 
 	printer := NewPrinter(encoder, NewSinglePrinterWriter(bufio.NewWriter(&output)))
 	err := printer.PrintResults(candidate.AsList())
@@ -127,6 +131,9 @@ func decodeOperator(d *dataTreeNavigator, context Context, expressionNode *Expre
 	preferences := expressionNode.Operation.Preferences.(decoderPreferences)
 
 	decoder := createDecoder(preferences.format)
+	if decoder == nil {
+		return Context{}, errors.New("no support for input format")
+	}
 
 	var results = list.New()
 	for el := context.MatchingNodes.Front(); el != nil; el = el.Next() {

pkg/yqlib/operator_encoder_decoder_test.go

@@ -8,6 +8,7 @@ var prefix = "D0, P[], (doc)::a:\n    cool:\n        bob: dylan\n"
 
 var encoderDecoderOperatorScenarios = []expressionScenario{
 	{
+		requiresFormat: "json",
 		description:    "Encode value as json string",
 		document:       `{a: {cool: "thing"}}`,
 		expression:     `.b = (.a | to_json)`,
@@ -17,6 +18,7 @@ var encoderDecoderOperatorScenarios = []expressionScenario{
 		},
 	},
 	{
+		requiresFormat: "json",
 		description:    "Encode value as json string, on one line",
 		subdescription: "Pass in a 0 indent to print json on a single line.",
 		document:       `{a: {cool: "thing"}}`,
@@ -27,6 +29,7 @@ var encoderDecoderOperatorScenarios = []expressionScenario{
 		},
 	},
 	{
+		requiresFormat: "json",
 		description:    "Encode value as json string, on one line shorthand",
 		subdescription: "Pass in a 0 indent to print json on a single line.",
 		document:       `{a: {cool: "thing"}}`,
@@ -37,6 +40,7 @@ var encoderDecoderOperatorScenarios = []expressionScenario{
 		},
 	},
 	{
+		requiresFormat: "json",
 		description:    "Decode a json encoded string",
 		subdescription: "Keep in mind JSON is a subset of YAML. If you want idiomatic yaml, pipe through the style operator to clear out the JSON styling.",
 		document:       `a: '{"cool":"thing"}'`,
@@ -193,6 +197,7 @@ var encoderDecoderOperatorScenarios = []expressionScenario{
 		},
 	},
 	{
+		requiresFormat: "xml",
 		description:    "Encode value as xml string",
 		document:       `{a: {cool: {foo: "bar", +@id: hi}}}`,
 		expression:     `.a | to_xml`,
@@ -201,6 +206,7 @@ var encoderDecoderOperatorScenarios = []expressionScenario{
 		},
 	},
 	{
+		requiresFormat: "xml",
 		description:    "Encode value as xml string on a single line",
 		document:       `{a: {cool: {foo: "bar", +@id: hi}}}`,
 		expression:     `.a | @xml`,
@@ -209,6 +215,7 @@ var encoderDecoderOperatorScenarios = []expressionScenario{
 		},
 	},
 	{
+		requiresFormat: "xml",
 		description:    "Encode value as xml string with custom indentation",
 		document:       `{a: {cool: {foo: "bar", +@id: hi}}}`,
 		expression:     `{"cat": .a | to_xml(1)}`,
@@ -217,6 +224,7 @@ var encoderDecoderOperatorScenarios = []expressionScenario{
 		},
 	},
 	{
+		requiresFormat: "xml",
 		description:    "Decode a xml encoded string",
 		document:       `a: "<foo>bar</foo>"`,
 		expression:     `.b = (.a | from_xml)`,
@@ -303,6 +311,7 @@ var encoderDecoderOperatorScenarios = []expressionScenario{
 		},
 	},
 	{
+		requiresFormat: "xml",
 		description:    "empty xml decode",
 		skipDoc:        true,
 		expression:     `"" | @xmld`,

pkg/yqlib/operator_load.go

@@ -34,6 +34,9 @@ func loadString(filename string) (*CandidateNode, error) {
 }
 
 func loadYaml(filename string, decoder Decoder) (*CandidateNode, error) {
+	if decoder == nil {
+		return nil, fmt.Errorf("could not load %s", filename)
+	}
 
 	file, err := os.Open(filename) // #nosec
 	if err != nil {

pkg/yqlib/operator_load_test.go

@@ -74,6 +74,7 @@ var loadScenarios = []expressionScenario{
 		},
 	},
 	{
+		requiresFormat: "xml",
 		description:    "Load from XML",
 		document:       "cool: things",
 		expression:     `.more_stuff = load_xml("../../examples/small.xml")`,

pkg/yqlib/operators_test.go

@@ -28,6 +28,7 @@ type expressionScenario struct {
 	skipDoc               bool
 	expectedError         string
 	dontFormatInputForDoc bool // dont format input doc for documentation generation
+	requiresFormat        string
 }
 
 func TestMain(m *testing.M) {
@@ -103,6 +104,23 @@ func testScenario(t *testing.T, s *expressionScenario) {
 		return
 	}
 
+	if s.requiresFormat != "" {
+		format := s.requiresFormat
+		inputFormat, err := InputFormatFromString(format)
+		if err != nil {
+			t.Error(err)
+		}
+		if decoder := createDecoder(inputFormat); decoder == nil {
+			t.Skipf("no support for %s input format", format)
+		}
+		outputFormat, err := OutputFormatFromString(format)
+		if err != nil {
+			t.Error(err)
+		}
+		if encoder := configureEncoder(outputFormat, 4); encoder == nil {
+			t.Skipf("no support for %s output format", format)
+		}
+	}
 	if err != nil {
 		t.Error(fmt.Errorf("%w: %v: %v", err, s.description, s.expression))
 		return

pkg/yqlib/printer_test.go

@@ -315,6 +315,9 @@ func TestPrinterMultipleDocsJson(t *testing.T) {
 	// note printDocSeparators is true, it should still not print document separators
 	// when outputing JSON.
 	encoder := NewJSONEncoder(0, false, false)
+	if encoder == nil {
+		t.Skipf("no support for %s output format", "json")
+	}
 	printer := NewPrinter(encoder, NewSinglePrinterWriter(writer))
 
 	inputs, err := readDocuments(strings.NewReader(multiDocSample), "sample.yml", 0, NewYamlDecoder(ConfiguredYamlPreferences))

pkg/yqlib/xml_test.go

@@ -1,3 +1,5 @@
+//go:build !yq_noxml
+
 package yqlib
 
 import (