Prepare linter for golangci-lint (#5)

# golangci/golangci-lint#4196
1. TestdataDir() -> analysistest.TestData()
2. Described False-Negative cases as testcases and in README.md
3. Fixed link for type_nested.go.skip in README.md
4. Added testcase with generic
5. Added testcase with alias
6. Added testcase with map, chan, array, func
# golangci/golangci-lint#4196
7. Added glob syntax for pkgs
8. Renamed options
9. Extended unexpected code message
10. Added unimplemented testcases

Author: maranqz

README.md

@@ -18,8 +18,8 @@ Installation
 
 ### Options
 
-- `-b`, `--blockedPkgs` - list of packages, where the structures should be created by factories. By default, all structures in all packages should be created by factories, [tests](testdata/src/factory/blockedPkgs).
-    - `-ob`, `onlyBlockedPkgs` - only blocked packages should use factory to initiate struct, [tests](testdata/src/factory/onlyBlockedPkgs).
+- `--packageGlobs` - list of glob packages, which can create structures without factories inside the glob package. By default, all structures from another package should be created by factories, [tests](testdata/src/factory/packageGlobs).
+    - `onlyPackageGlobs` - use a factory to initiate a structure for glob packages only, [tests](testdata/src/factory/onlyPackageGlobs).
 
 ## Example
 
@@ -120,8 +120,28 @@ func nextID() int64 {
 </td></tr>
 </tbody></table>
 
+## False Negative
+
+Linter doesn't catch some cases.
+
+1. Buffered channel. You can initialize struct in line `v, ok := <-bufCh` [example](testdata/src/factory/unimplemented/chan.go).
+2. Local initialization, [example](testdata/src/factory/unimplemented/local/).
+3. Named return. If you want to block that case, you can use [nonamedreturns](https://github.com/firefart/nonamedreturns) linter, [example](testdata/src/factory/unimplemented/named_return.go).
+4. var declaration, `var initilized nested.Struct` gives structure without factory, [example](testdata/src/factory/unimplemented/var.go).
+5. Casting to nested struct, [example](testdata/src/factory/unimplemented/casting/).
+
 ## TODO
 
+### Possible Features
+
+1. Catch nested struct in the same package, [example](testdata/src/factory/unimplemented/local/nested_struct.go).
+   ```go
+   return Struct{
+       Other: OtherStruct{}, // want `Use factory for nested.Struct`
+   }
+   ```
+2. Resolve false negative issue with `var declaration`.
+
 ### Features that are difficult to implement and unplanned
 
-1. Type assertion, type declaration and type underlying, [tests](testdata/src/factory/default/type_nested.go.skip).
+1. Type assertion, type declaration and type underlying, [tests](testdata/src/factory/simple/type_nested.go.skip).

factory.go

@@ -4,15 +4,17 @@ import (
 	"fmt"
 	"go/ast"
 	"go/types"
+	"log/slog"
 	"strings"
 
+	"github.com/gobwas/glob"
 	"golang.org/x/tools/go/analysis"
 	"golang.org/x/tools/go/analysis/passes/inspect"
 )
 
 type config struct {
-	blockedPkgs     stringsFlag
-	onlyBlockedPkgs bool
+	pkgGlobs     stringsFlag
+	onlyPkgGlobs bool
 }
 
 type stringsFlag []string
@@ -28,21 +30,18 @@ func (s *stringsFlag) Set(value string) error {
 }
 
 func (s stringsFlag) Value() []string {
-	blockedPkgs := make([]string, 0, len(s))
+	res := make([]string, 0, len(s))
 
-	for _, pgk := range s {
-		pgk = strings.TrimSpace(pgk)
-		pgk = strings.TrimSuffix(pgk, "/") + "/"
-
-		blockedPkgs = append(blockedPkgs, pgk)
+	for _, str := range s {
+		res = append(res, strings.TrimSpace(str))
 	}
 
-	return blockedPkgs
+	return res
 }
 
 const (
-	blockedPkgsDesc     = "List of packages, which should use factory to initiate struct."
-	onlyBlockedPkgsDesc = "Only blocked packages should use factory to initiate struct."
+	packageGlobsDesc = "List of glob packages, which can create structures without factories inside the glob package"
+	onlyPkgGlobsDesc = "Use a factory to initiate a structure for glob packages only."
 )
 
 func NewAnalyzer() *analysis.Analyzer {
@@ -54,11 +53,9 @@ func NewAnalyzer() *analysis.Analyzer {
 
 	cfg := config{}
 
-	analyzer.Flags.Var(&cfg.blockedPkgs, "b", blockedPkgsDesc)
-	analyzer.Flags.Var(&cfg.blockedPkgs, "blockedPkgs", blockedPkgsDesc)
+	analyzer.Flags.Var(&cfg.pkgGlobs, "packageGlobs", packageGlobsDesc)
 
-	analyzer.Flags.BoolVar(&cfg.onlyBlockedPkgs, "ob", false, onlyBlockedPkgsDesc)
-	analyzer.Flags.BoolVar(&cfg.onlyBlockedPkgs, "onlyBlockedPkgs", false, onlyBlockedPkgsDesc)
+	analyzer.Flags.BoolVar(&cfg.onlyPkgGlobs, "onlyPackageGlobs", false, onlyPkgGlobsDesc)
 
 	analyzer.Run = run(&cfg)
 
@@ -68,14 +65,19 @@ func NewAnalyzer() *analysis.Analyzer {
 func run(cfg *config) func(pass *analysis.Pass) (interface{}, error) {
 	return func(pass *analysis.Pass) (interface{}, error) {
 		var blockedStrategy blockedStrategy = newAnotherPkg()
-		if len(cfg.blockedPkgs) > 0 {
+		if len(cfg.pkgGlobs) > 0 {
 			defaultStrategy := blockedStrategy
-			if cfg.onlyBlockedPkgs {
+			if cfg.onlyPkgGlobs {
 				defaultStrategy = newNilPkg()
 			}
 
+			pkgGlobs, err := compileGlobs(cfg.pkgGlobs.Value())
+			if err != nil {
+				return nil, err
+			}
+
 			blockedStrategy = newBlockedPkgs(
-				cfg.blockedPkgs.Value(),
+				pkgGlobs,
 				defaultStrategy,
 			)
 		}
@@ -109,134 +111,146 @@ func (v *visitor) Visit(node ast.Node) ast.Visitor {
 		return v
 	}
 
-	var selExpr *ast.SelectorExpr
+	compLitType := compLit.Type
 
 	// check []*Struct{{},&Struct}
-	arr, isArr := compLit.Type.(*ast.ArrayType)
-	if isArr && len(compLit.Elts) > 0 {
-		v.checkSlice(arr, compLit)
+	slice, isMap := compLitType.(*ast.ArrayType)
+	if isMap && len(compLit.Elts) > 0 {
+		v.checkSlice(slice, compLit)
 
 		return v
 	}
 
-	ident, ok := compLit.Type.(*ast.Ident)
-	if !ok {
-		selExpr, ok = compLit.Type.(*ast.SelectorExpr)
-		if !ok {
-			return v
-		}
+	// check map[Struct]Struct{{}:{}}
+	mp, isMap := compLitType.(*ast.MapType)
+	if isMap {
+		v.checkMap(mp, compLit)
 
-		ident = selExpr.Sel
+		return v
 	}
 
+	// check Struct{}
+	ident := v.getIdent(compLitType)
 	identObj := v.pass.TypesInfo.ObjectOf(ident)
+
 	if identObj == nil {
 		return v
 	}
 
 	if v.blockedStrategy.IsBlocked(v.pass.Pkg, identObj) {
-		v.report(node, identObj)
+		v.report(ident, identObj)
 	}
 
 	return v
 }
 
-func (v *visitor) checkSlice(arr *ast.ArrayType, compLit *ast.CompositeLit) {
-	arrElt := arr.Elt
-	if starExpr, ok := arr.Elt.(*ast.StarExpr); ok {
-		arrElt = starExpr.X
+func (v *visitor) getIdent(expr ast.Expr) *ast.Ident {
+	// pointer *Struct{}
+	if starExpr, ok := expr.(*ast.StarExpr); ok {
+		expr = starExpr.X
 	}
 
-	selExpr, ok := arrElt.(*ast.SelectorExpr)
-	if !ok {
-		return
+	// generic Struct[any]{}
+	indexExpr, ok := expr.(*ast.IndexExpr)
+	if ok {
+		expr = indexExpr.X
 	}
 
-	identObj := v.pass.TypesInfo.ObjectOf(selExpr.Sel)
-	if identObj != nil {
-		for _, elt := range compLit.Elts {
-			eltCompLit, ok := elt.(*ast.CompositeLit)
-			if ok && eltCompLit.Type == nil {
-				if v.blockedStrategy.IsBlocked(v.pass.Pkg, identObj) {
-					v.report(elt, identObj)
-				}
-			}
-		}
+	selExpr, ok := expr.(*ast.SelectorExpr)
+	if !ok {
+		return nil
 	}
-}
 
-func (v *visitor) report(node ast.Node, obj types.Object) {
-	v.pass.Reportf(
-		node.Pos(),
-		fmt.Sprintf(`Use factory for %s.%s`, obj.Pkg().Name(), obj.Name()),
-	)
+	return selExpr.Sel
 }
 
-type blockedStrategy interface {
-	IsBlocked(currentPkg *types.Package, identObj types.Object) bool
-}
+func (v *visitor) checkSlice(arr *ast.ArrayType, compLit *ast.CompositeLit) {
+	ident := v.getIdent(arr.Elt)
+	identObj := v.pass.TypesInfo.ObjectOf(ident)
 
-type nilPkg struct{}
+	if identObj == nil {
+		return
+	}
 
-func newNilPkg() nilPkg {
-	return nilPkg{}
+	for _, elt := range compLit.Elts {
+		v.checkBrackets(elt, identObj)
+	}
 }
 
-func (nilPkg) IsBlocked(_ *types.Package, _ types.Object) bool {
-	return false
-}
+func (v *visitor) checkMap(mp *ast.MapType, compLit *ast.CompositeLit) {
+	keyIdent := v.getIdent(mp.Key)
+	keyIdentObj := v.pass.TypesInfo.ObjectOf(keyIdent)
 
-type anotherPkg struct{}
+	valueIdent := v.getIdent(mp.Value)
+	valueIdentObj := v.pass.TypesInfo.ObjectOf(valueIdent)
 
-func newAnotherPkg() anotherPkg {
-	return anotherPkg{}
-}
+	if keyIdentObj == nil && valueIdentObj == nil {
+		return
+	}
 
-func (anotherPkg) IsBlocked(
-	currentPkg *types.Package,
-	identObj types.Object,
-) bool {
-	return currentPkg.Path() != identObj.Pkg().Path()
-}
+	for _, elt := range compLit.Elts {
+		keyValueExpr, ok := elt.(*ast.KeyValueExpr)
+		if !ok {
+			v.unexpectedCode(elt)
 
-type blockedPkgs struct {
-	blockedPkgs     []string
-	defaultStrategy blockedStrategy
-}
+			continue
+		}
 
-func newBlockedPkgs(
-	pkgs []string,
-	defaultStrategy blockedStrategy,
-) blockedPkgs {
-	return blockedPkgs{
-		blockedPkgs:     pkgs,
-		defaultStrategy: defaultStrategy,
+		v.checkBrackets(keyValueExpr.Key, keyIdentObj)
+		v.checkBrackets(keyValueExpr.Value, valueIdentObj)
 	}
 }
 
-func (b blockedPkgs) IsBlocked(
-	currentPkg *types.Package,
-	identObj types.Object,
-) bool {
-	identPkgPath := identObj.Pkg().Path() + "/"
-	currentPkgPath := currentPkg.Path() + "/"
+// checkBrackets check {} in array, slice, map.
+func (v *visitor) checkBrackets(expr ast.Expr, identObj types.Object) {
+	compLit, ok := expr.(*ast.CompositeLit)
+	if ok && compLit.Type == nil && identObj != nil {
+		if v.blockedStrategy.IsBlocked(v.pass.Pkg, identObj) {
+			v.report(compLit, identObj)
+		}
+	}
+}
 
-	for _, blockedPkg := range b.blockedPkgs {
-		isBlocked := strings.HasPrefix(identPkgPath, blockedPkg)
-		isIncludedInBlocked := strings.HasPrefix(currentPkgPath, blockedPkg)
+func (v *visitor) report(node ast.Node, obj types.Object) {
+	v.pass.Reportf(
+		node.Pos(),
+		fmt.Sprintf(`Use factory for %s.%s`, obj.Pkg().Name(), obj.Name()),
+	)
+}
 
-		if isIncludedInBlocked {
-			continue
-		}
+func (v *visitor) unexpectedCode(node ast.Node) {
+	fset := v.pass.Fset
+	pos := fset.Position(node.Pos())
+	slog.Error(
+		fmt.Sprintf("Unexpected code in %s:%d:%d, please report to the developer with example.",
+			fset.File(node.Pos()).Name(),
+			pos.Line,
+			pos.Column,
+		),
+	)
+}
 
-		if isBlocked {
+func containsMatchGlob(globs []glob.Glob, el string) bool {
+	for _, g := range globs {
+		if g.Match(el) {
 			return true
 		}
+	}
 
-		if b.defaultStrategy.IsBlocked(currentPkg, identObj) {
-			return true
+	return false
+}
+
+func compileGlobs(globs []string) ([]glob.Glob, error) {
+	compiledGlobs := make([]glob.Glob, len(globs))
+
+	for idx, globString := range globs {
+		glob, err := glob.Compile(globString)
+		if err != nil {
+			return nil, fmt.Errorf("unable to compile globs %s: %w", glob, err)
 		}
+
+		compiledGlobs[idx] = glob
 	}
 
-	return false
+	return compiledGlobs, nil
 }

go.mod

@@ -2,7 +2,10 @@ module github.com/maranqz/go-factory-lint
 
 go 1.20
 
-require golang.org/x/tools v0.15.0
+require (
+	github.com/gobwas/glob v0.2.3
+	golang.org/x/tools v0.15.0
+)
 
 require (
 	golang.org/x/mod v0.14.0 // indirect

go.sum

@@ -1,3 +1,5 @@
+github.com/gobwas/glob v0.2.3 h1:A4xDbljILXROh+kObIiy5kIaPYD8e96x1tgBhUI5J+Y=
+github.com/gobwas/glob v0.2.3/go.mod h1:d3Ez4x06l9bZtSvzIay5+Yzi0fmZzPgnTbPcKjJAkT8=
 golang.org/x/mod v0.14.0 h1:dGoOF9QVLYng8IHTm7BAyWqCqSheQ5pYWGhzW00YJr0=
 golang.org/x/mod v0.14.0/go.mod h1:hTbmBsO62+eylJbnUtE2MGJUyE7QWk4xUqPFrRgJ+7c=
 golang.org/x/sync v0.5.0 h1:60k92dhOjHxJkrqnwsfl8KuaHbn/5dl0lUPUklKo3qE=