feat: add ExcludeMethod options with default (#8)

Co-authored-by: Fernandez Ludovic <[email protected]>

.github/workflows/build.yaml

@@ -34,4 +34,6 @@ jobs:
           go-version-file: go.mod
       - uses: golangci/golangci-lint-action@v6
         with:
-          version: v1.61
+          version: v1.62
+      - run: make build
+      - run: go vet -vettool=./recvcheck ./...

.golangci.yml

@@ -0,0 +1,10 @@
+linters:
+  enable:
+    - recvcheck
+
+output:
+  show-stats: true
+  sort-results: true
+  sort-order:
+    - linter
+    - file

analyzer.go

@@ -8,14 +8,50 @@ import (
 	"golang.org/x/tools/go/ast/inspector"
 )
 
-var Analyzer = &analysis.Analyzer{
-	Name:     "recvcheck",
-	Doc:      "checks for receiver type consistency",
-	Run:      run,
-	Requires: []*analysis.Analyzer{inspect.Analyzer},
+// NewAnalyzer returns a new analyzer to check for receiver type consistency.
+func NewAnalyzer(s Settings) *analysis.Analyzer {
+	// Default excludes for Marshal/Encode methods https://github.com/raeperd/recvcheck/issues/7
+	excludedMethods := map[string]struct{}{
+		"MarshalText":   {},
+		"MarshalJSON":   {},
+		"MarshalYAML":   {},
+		"MarshalXML":    {},
+		"MarshalBinary": {},
+		"GobEncode":     {},
+	}
+
+	if s.DisableBuiltin {
+		excludedMethods = map[string]struct{}{}
+	}
+
+	a := &analyzer{excludedMethods: excludedMethods}
+
+	return &analysis.Analyzer{
+		Name:     "recvcheck",
+		Doc:      "checks for receiver type consistency",
+		Run:      a.run,
+		Requires: []*analysis.Analyzer{inspect.Analyzer},
+	}
+}
+
+// Settings is the configuration for the analyzer.
+type Settings struct {
+	// DisableBuiltin if true, disables the built-in method excludes.
+	// Built-in excluded methods:
+	//   - "MarshalText"
+	//   - "MarshalJSON"
+	//   - "MarshalYAML"
+	//   - "MarshalXML"
+	//   - "MarshalBinary"
+	//   - "GobEncode"
+	DisableBuiltin bool
 }
 
-func run(pass *analysis.Pass) (any, error) {
+type analyzer struct {
+	excludedMethods map[string]struct{}
+}
+
+func (r *analyzer) run(pass *analysis.Pass) (any, error) {
 	inspector := pass.ResultOf[inspect.Analyzer].(*inspector.Inspector)
 
 	structs := map[string]*structType{}
@@ -25,6 +61,10 @@ func run(pass *analysis.Pass) (any, error) {
 			return
 		}
 
+		if r.isExcluded(funcDecl) {
+			return
+		}
+
 		var recv *ast.Ident
 		var isStar bool
 		switch recvType := funcDecl.Recv.List[0].Type.(type) {
@@ -61,6 +101,15 @@ func run(pass *analysis.Pass) (any, error) {
 	return nil, nil
 }
 
+func (r *analyzer) isExcluded(f *ast.FuncDecl) bool {
+	if f.Name == nil || f.Name.Name == "" {
+		return true
+	}
+
+	_, found := r.excludedMethods[f.Name.Name]
+	return found
+}
+
 type structType struct {
 	starUsed bool
 	typeUsed bool

analyzer_test.go

@@ -8,5 +8,29 @@ import (
 )
 
 func TestAnalyzer(t *testing.T) {
-	analysistest.Run(t, analysistest.TestData(), recvcheck.Analyzer, "test")
+	testCases := []struct {
+		desc     string
+		settings recvcheck.Settings
+	}{
+		{
+			desc:     "basic",
+			settings: recvcheck.Settings{},
+		},
+		{
+			desc:     "excluded",
+			settings: recvcheck.Settings{},
+		},
+		{
+			desc:     "disablebuiltin",
+			settings: recvcheck.Settings{DisableBuiltin: true},
+		},
+	}
+
+	for _, test := range testCases {
+		t.Run(test.desc, func(t *testing.T) {
+			a := recvcheck.NewAnalyzer(test.settings)
+
+			analysistest.Run(t, analysistest.TestData(), a, test.desc)
+		})
+	}
 }

cmd/recvcheck/main.go

@@ -1,10 +1,21 @@
 package main
 
 import (
+	"flag"
+
 	"github.com/raeperd/recvcheck"
 	"golang.org/x/tools/go/analysis/singlechecker"
 )
 
 func main() {
-	singlechecker.Main(recvcheck.Analyzer)
+	var noBuiltinExcludeMethod bool
+
+	flag.BoolVar(&noBuiltinExcludeMethod, "no-builtin-exclude-method", false,
+		`disables the default exclude methods such as "MarshalJSON"`)
+
+	setting := recvcheck.Settings{
+		DisableBuiltin: noBuiltinExcludeMethod,
+	}
+
+	singlechecker.Main(recvcheck.NewAnalyzer(setting))
 }

testdata/src/test/rpc.go → testdata/src/basic/rpc.go

@@ -1,4 +1,4 @@
-package test
+package basic
 
 import (
 	"time"

testdata/src/disablebuiltin/binary.go

@@ -0,0 +1,11 @@
+package disablebuiltin
+
+type Binary struct{} // want `the methods of "Binary" use pointer receiver and non-pointer receiver.`
+
+func (b Binary) MarshalBinary() ([]byte, error) {
+	panic("not implemented")
+}
+
+func (b *Binary) UnmarshalBinary(data []byte) error {
+	panic("not implemented")
+}

testdata/src/disablebuiltin/gob.go

@@ -0,0 +1,11 @@
+package disablebuiltin
+
+type Gob struct{} // want `the methods of "Gob" use pointer receiver and non-pointer receiver.`
+
+func (g Gob) GobEncode() ([]byte, error) {
+	panic("not implemented")
+}
+
+func (g *Gob) GobDecode(data []byte) error {
+	panic("not implemented")
+}

testdata/src/disablebuiltin/json.go

@@ -0,0 +1,11 @@
+package disablebuiltin
+
+type JSON struct{} // want `the methods of "JSON" use pointer receiver and non-pointer receiver.`
+
+func (j JSON) MarshalJSON() ([]byte, error) {
+	panic("not implemented")
+}
+
+func (j *JSON) UnmarshalJSON(b []byte) error {
+	panic("not implemented")
+}

testdata/src/disablebuiltin/text.go

@@ -0,0 +1,11 @@
+package disablebuiltin
+
+type Text struct{} // want `the methods of "Text" use pointer receiver and non-pointer receiver.`
+
+func (t Text) MarshalText() ([]byte, error) {
+	panic("not implemented")
+}
+
+func (t *Text) UnmarshalText(b []byte) error {
+	panic("not implemented")
+}

testdata/src/disablebuiltin/xml.go

@@ -0,0 +1,13 @@
+package disablebuiltin
+
+import "encoding/xml"
+
+type XML struct{} // want `the methods of "XML" use pointer receiver and non-pointer receiver.`
+
+func (x XML) MarshalXML(e *xml.Encoder, start xml.StartElement) error {
+	panic("not implemented")
+}
+
+func (x *XML) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
+	panic("not implemented")
+}

testdata/src/disablebuiltin/yaml.go

@@ -0,0 +1,13 @@
+package disablebuiltin
+
+type Node struct{}
+
+type YAML struct{} // want `the methods of "YAML" use pointer receiver and non-pointer receiver.`
+
+func (j YAML) MarshalYAML() (any, error) {
+	panic("not implemented")
+}
+
+func (j *YAML) UnmarshalYAML(value *Node) error {
+	panic("not implemented")
+}

testdata/src/excluded/binary.go

@@ -0,0 +1,11 @@
+package excluded
+
+type Binary struct{}
+
+func (b Binary) MarshalBinary() ([]byte, error) {
+	panic("not implemented")
+}
+
+func (b *Binary) UnmarshalBinary(data []byte) error {
+	panic("not implemented")
+}

testdata/src/excluded/gob.go

@@ -0,0 +1,11 @@
+package excluded
+
+type Gob struct{}
+
+func (g Gob) GobEncode() ([]byte, error) {
+	panic("not implemented")
+}
+
+func (g *Gob) GobDecode(data []byte) error {
+	panic("not implemented")
+}

testdata/src/excluded/json.go

@@ -0,0 +1,11 @@
+package excluded
+
+type JSON struct{}
+
+func (j JSON) MarshalJSON() ([]byte, error) {
+	panic("not implemented")
+}
+
+func (j *JSON) UnmarshalJSON(b []byte) error {
+	panic("not implemented")
+}

testdata/src/excluded/text.go

@@ -0,0 +1,11 @@
+package excluded
+
+type Text struct{}
+
+func (t Text) MarshalText() ([]byte, error) {
+	panic("not implemented")
+}
+
+func (t *Text) UnmarshalText(b []byte) error {
+	panic("not implemented")
+}

testdata/src/excluded/xml.go

@@ -0,0 +1,13 @@
+package excluded
+
+import "encoding/xml"
+
+type XML struct{}
+
+func (x XML) MarshalXML(e *xml.Encoder, start xml.StartElement) error {
+	panic("not implemented")
+}
+
+func (x *XML) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
+	panic("not implemented")
+}

testdata/src/excluded/yaml.go

@@ -0,0 +1,13 @@
+package excluded
+
+type Node struct{}
+
+type YAML struct{}
+
+func (j YAML) MarshalYAML() (any, error) {
+	panic("not implemented")
+}
+
+func (j *YAML) UnmarshalYAML(value *Node) error {
+	panic("not implemented")
+}