feature: add support for omitzero in rule struct-tag (#1238)

lint/package.go

@@ -38,6 +38,7 @@ var (
 	go115 = goversion.Must(goversion.NewVersion("1.15"))
 	go121 = goversion.Must(goversion.NewVersion("1.21"))
 	go122 = goversion.Must(goversion.NewVersion("1.22"))
+	go124 = goversion.Must(goversion.NewVersion("1.24"))
 )
 
 // Files return package's files.
@@ -210,6 +211,11 @@ func (p *Package) IsAtLeastGo122() bool {
 	return p.goVersion.GreaterThanOrEqual(go122)
 }
 
+// IsAtLeastGo124 returns true if the Go version for this package is 1.24 or higher, false otherwise
+func (p *Package) IsAtLeastGo124() bool {
+	return p.goVersion.GreaterThanOrEqual(go124)
+}
+
 func getSortableMethodFlagForFunction(fn *ast.FuncDecl) sortableMethodsFlags {
 	switch {
 	case astutils.FuncSignatureIs(fn, "Len", []string{}, []string{"int"}):

rule/struct_tag.go

@@ -56,6 +56,7 @@ func (r *StructTagRule) Apply(file *lint.File, _ lint.Arguments) []lint.Failure
 	w := lintStructTagRule{
 		onFailure:      onFailure,
 		userDefined:    r.userDefined,
+		isAtLeastGo124: file.Pkg.IsAtLeastGo124(),
 	}
 
 	ast.Walk(w, file.AST)
@@ -73,6 +74,7 @@ type lintStructTagRule struct {
 	userDefined    map[string][]string // map: key -> []option
 	usedTagNbr     map[int]bool        // list of used tag numbers
 	usedTagName    map[string]bool     // list of used tag keys
+	isAtLeastGo124 bool
 }
 
 func (w lintStructTagRule) Visit(node ast.Node) ast.Visitor {
@@ -281,6 +283,11 @@ func (w lintStructTagRule) checkJSONTag(name string, options []string) (string,
 			if name != "-" {
 				return "option can not be empty in JSON tag", false
 			}
+		case "omitzero":
+			if w.isAtLeastGo124 {
+				continue
+			}
+			fallthrough
 		default:
 			if w.isUserDefined(keyJSON, opt) {
 				continue

test/struct_tag_test.go

@@ -16,3 +16,7 @@ func TestStructTagWithUserOptions(t *testing.T) {
 		Arguments: []any{"json,inline,outline", "bson,gnu"},
 	})
 }
+
+func TestStructTagAfterGo1_24(t *testing.T) {
+	testRule(t, "go1.24/struct_tag", &rule.StructTagRule{})
+}

testdata/go1.24/go.mod

@@ -0,0 +1,3 @@
+module github.com/mgechev/revive/testdata
+
+go 1.24

testdata/go1.24/struct_tag.go

@@ -0,0 +1,125 @@
+package fixtures
+
+import "time"
+
+type decodeAndValidateRequest struct {
+	// BEAWRE : the flag of URLParam should match the const string URLParam
+	URLParam    string `json:"-" path:"url_param" validate:"numeric"`
+	Text        string `json:"text" validate:"max=10"`
+	DefaultInt  int    `json:"defaultInt" default:"10.0"` // MATCH /field's type and default value's type mismatch/
+	DefaultInt2 int    `json:"defaultInt2" default:"10"`
+	// MATCH:12 /unknown option 'inline' in JSON tag/
+	DefaultInt3      int             `json:"defaultInt2,inline" default:"11"` // MATCH /duplicate tag name: 'defaultInt2'/
+	DefaultString    string          `json:"defaultString" default:"foo"`
+	DefaultBool      bool            `json:"defaultBool" default:"trues"` // MATCH /field's type and default value's type mismatch/
+	DefaultBool2     bool            `json:"defaultBool2" default:"true"`
+	DefaultBool3     bool            `json:"defaultBool3" default:"false"`
+	DefaultFloat     float64         `json:"defaultFloat" default:"f10.0"` // MATCH /field's type and default value's type mismatch/
+	DefaultFloat2    float64         `json:"defaultFloat2" default:"10.0"`
+	MandatoryStruct  mandatoryStruct `json:"mandatoryStruct" required:"trues"` // MATCH /required should be 'true' or 'false'/
+	MandatoryStruct2 mandatoryStruct `json:"mandatoryStruct2" required:"true"`
+	MandatoryStruct4 mandatoryStruct `json:"mandatoryStruct4" required:"false"`
+	OptionalStruct   *optionalStruct `json:"optionalStruct,omitempty"`
+	OptionalQuery    string          `json:"-" querystring:"queryfoo"`
+	optionalQuery    string          `json:"-" querystring:"queryfoo"` // MATCH /tag on not-exported field optionalQuery/
+	// No-reg test for bug https://github.com/mgechev/revive/issues/208
+	Tiret       string `json:"-,"`
+	BadTiret    string `json:"other,"`               // MATCH /option can not be empty in JSON tag/
+	ForOmitzero string `json:"forOmitZero,omitzero"` // 'omitzero' is valid in go 1.24
+}
+
+type RangeAllocation struct {
+	metav1.TypeMeta   `json:",inline"` // MATCH /unknown option 'inline' in JSON tag/
+	metav1.ObjectMeta `json:"metadata,omitempty"`
+	Range             string `json:"range,flow"`  // MATCH /unknown option 'flow' in JSON tag/
+	Data              []byte `json:"data,inline"` // MATCH /unknown option 'inline' in JSON tag/
+}
+
+type RangeAllocation struct {
+	metav1.TypeMeta   `bson:",minsize"`
+	metav1.ObjectMeta `bson:"metadata,omitempty"`
+	Range             string `bson:"range,flow"` // MATCH /unknown option 'flow' in BSON tag/
+	Data              []byte `bson:"data,inline"`
+}
+
+type TestContextSpecificTags2 struct {
+	A       int       `asn1:"explicit,tag:1"`
+	B       int       `asn1:"tag:2"`
+	S       string    `asn1:"tag:0,utf8"`
+	Ints    []int     `asn1:"set"`
+	Version int       `asn1:"optional,explicit,default:0,tag:000"` // MATCH /duplicated tag number 0/
+	Time    time.Time `asn1:"explicit,tag:4,other"`                // MATCH /unknown option 'other' in ASN1 tag/
+	X       int       `asn1:"explicit,tag:invalid"`                // MATCH /ASN1 tag must be a number, got 'invalid'/
+}
+
+type VirtualMachineRelocateSpecDiskLocator struct {
+	DynamicData
+
+	DiskId          int32                           `xml:"diskId,attr,cdata"`
+	Datastore       ManagedObjectReference          `xml:"datastore,chardata,innerxml"`
+	DiskMoveType    string                          `xml:"diskMoveType,omitempty,comment"`
+	DiskBackingInfo BaseVirtualDeviceBackingInfo    `xml:"diskBackingInfo,omitempty,any"`
+	Profile         []BaseVirtualMachineProfileSpec `xml:"profile,omitempty,other"` // MATCH /unknown option 'other' in XML tag/
+}
+
+type TestDuplicatedXMLTags struct {
+	A int `xml:"a"`
+	B int `xml:"a"` // MATCH /duplicate tag name: 'a'/
+	C int `xml:"c"`
+}
+
+type TestDuplicatedBSONTags struct {
+	A int `bson:"b"`
+	B int `bson:"b"` // MATCH /duplicate tag name: 'b'/
+	C int `bson:"c"`
+}
+
+type TestDuplicatedYAMLTags struct {
+	A int `yaml:"b"`
+	B int `yaml:"c"`
+	C int `yaml:"c"` // MATCH /duplicate tag name: 'c'/
+}
+
+type TestDuplicatedProtobufTags struct {
+	A int `protobuf:"varint,name=b"`
+	B int `protobuf:"varint,name=c"`
+	C int `protobuf:"varint,name=c"` // MATCH /duplicate tag name: 'c'/
+}
+
+// test case from
+// sigs.k8s.io/kustomize/api/types/helmchartargs.go
+
+type HelmChartArgs struct {
+	ChartName        string                 `json:"chartName,omitempty" yaml:"chartName,omitempty"`
+	ChartVersion     string                 `json:"chartVersion,omitempty" yaml:"chartVersion,omitempty"`
+	ChartRepoURL     string                 `json:"chartRepoUrl,omitempty" yaml:"chartRepoUrl,omitempty"`
+	ChartHome        string                 `json:"chartHome,omitempty" yaml:"chartHome,omitempty"`
+	ChartRepoName    string                 `json:"chartRepoName,omitempty" yaml:"chartRepoName,omitempty"`
+	HelmBin          string                 `json:"helmBin,omitempty" yaml:"helmBin,omitempty"`
+	HelmHome         string                 `json:"helmHome,omitempty" yaml:"helmHome,omitempty"`
+	Values           string                 `json:"values,omitempty" yaml:"values,omitempty"`
+	ValuesLocal      map[string]interface{} `json:"valuesLocal,omitempty" yaml:"valuesLocal,omitempty"`
+	ValuesMerge      string                 `json:"valuesMerge,omitempty" yaml:"valuesMerge,omitempty"`
+	ReleaseName      string                 `json:"releaseName,omitempty" yaml:"releaseName,omitempty"`
+	ReleaseNamespace string                 `json:"releaseNamespace,omitempty" yaml:"releaseNamespace,omitempty"`
+	ExtraArgs        []string               `json:"extraArgs,omitempty" yaml:"extraArgs,omitempty"`
+}
+
+// Test message for holding primitive types.
+type Simple struct {
+	OBool                *bool    `protobuf:"varint,1,req,json=oBool"`                           // MATCH /protobuf tag lacks mandatory option 'name'/
+	OInt32               *int32   `protobuf:"varint,2,opt,name=o_int32,jsonx=oInt32"`            // MATCH /unknown option 'jsonx' in protobuf tag/
+	OInt32Str            *int32   `protobuf:"varint,3,rep,name=o_int32_str,name=oInt32Str"`      // MATCH /protobuf tag has duplicated option 'name'/
+	OInt64               *int64   `protobuf:"varint,4,opt,json=oInt64,name=o_int64,json=oInt64"` // MATCH /protobuf tag has duplicated option 'json'/
+	OSint32Str           *int32   `protobuf:"zigzag32,11,opt,name=o_sint32_str,json=oSint32Str"`
+	OSint64Str           *int64   `protobuf:"zigzag64,13,opt,name=o_sint32_str,json=oSint64Str"` // MATCH /duplicate tag name: 'o_sint32_str'/
+	OFloat               *float32 `protobuf:"fixed32,14,opt,name=o_float,json=oFloat"`
+	ODouble              *float64 `protobuf:"fixed64,014,opt,name=o_double,json=oDouble"`      // MATCH /duplicated tag number 14/
+	ODoubleStr           *float64 `protobuf:"fixed6,17,opt,name=o_double_str,json=oDoubleStr"` // MATCH /invalid protobuf tag name 'fixed6'/
+	OString              *string  `protobuf:"bytes,18,opt,name=o_string,json=oString"`
+	OString2             *string  `protobuf:"bytes,name=ameno"`
+	OString3             *string  `protobuf:"bytes,name=ameno"` // MATCH /duplicate tag name: 'ameno'/
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}

testdata/struct_tag.go

@@ -25,6 +25,7 @@ type decodeAndValidateRequest struct {
 	// No-reg test for bug https://github.com/mgechev/revive/issues/208
 	Tiret       string `json:"-,"`
 	BadTiret    string `json:"other,"`               // MATCH /option can not be empty in JSON tag/
+	ForOmitzero string `json:"forOmitZero,omitzero"` // MATCH /unknown option 'omitzero' in JSON tag/
 }
 
 type RangeAllocation struct {