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Adds support for new type alias any in the rule redefines-built-in (
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#659)

* adds support for any type alias

* adds more representative tests
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@chavacava
chavacava authored Mar 29, 2022
1 parent 5f6f0eb commit fa939ad
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Showing 2 changed files with 121 additions and 75 deletions.
186 changes: 111 additions & 75 deletions rule/redefines-builtin-id.go
View file
Original file line number Diff line number Diff line change
Expand Up @@ -8,72 +8,73 @@ import (
"github.com/mgechev/revive/lint"
)

var builtInConstAndVars = map[string]bool{
"true": true,
"false": true,
"iota": true,
"nil": true,
}

var builtFunctions = map[string]bool{
"append": true,
"cap": true,
"close": true,
"complex": true,
"copy": true,
"delete": true,
"imag": true,
"len": true,
"make": true,
"new": true,
"panic": true,
"print": true,
"println": true,
"real": true,
"recover": true,
}

var builtInTypes = map[string]bool{
"ComplexType": true,
"FloatType": true,
"IntegerType": true,
"Type": true,
"Type1": true,
"bool": true,
"byte": true,
"complex128": true,
"complex64": true,
"error": true,
"float32": true,
"float64": true,
"int": true,
"int16": true,
"int32": true,
"int64": true,
"int8": true,
"rune": true,
"string": true,
"uint": true,
"uint16": true,
"uint32": true,
"uint64": true,
"uint8": true,
"uintptr": true,
"any": true,
}

// RedefinesBuiltinIDRule warns when a builtin identifier is shadowed.
type RedefinesBuiltinIDRule struct{}

// Apply applies the rule to given file.
func (r *RedefinesBuiltinIDRule) Apply(file *lint.File, _ lint.Arguments) []lint.Failure {
var failures []lint.Failure

builtInConstAndVars := map[string]bool{
"true": true,
"false": true,
"iota": true,
"nil": true,
}

builtFunctions := map[string]bool{
"append": true,
"cap": true,
"close": true,
"complex": true,
"copy": true,
"delete": true,
"imag": true,
"len": true,
"make": true,
"new": true,
"panic": true,
"print": true,
"println": true,
"real": true,
"recover": true,
}

builtInTypes := map[string]bool{
"ComplexType": true,
"FloatType": true,
"IntegerType": true,
"Type": true,
"Type1": true,
"bool": true,
"byte": true,
"complex128": true,
"complex64": true,
"error": true,
"float32": true,
"float64": true,
"int": true,
"int16": true,
"int32": true,
"int64": true,
"int8": true,
"rune": true,
"string": true,
"uint": true,
"uint16": true,
"uint32": true,
"uint64": true,
"uint8": true,
"uintptr": true,
}

onFailure := func(failure lint.Failure) {
failures = append(failures, failure)
}

astFile := file.AST
w := &lintRedefinesBuiltinID{builtInConstAndVars, builtFunctions, builtInTypes, onFailure}
w := &lintRedefinesBuiltinID{onFailure}
ast.Walk(w, astFile)

return failures
Expand All @@ -85,34 +86,46 @@ func (r *RedefinesBuiltinIDRule) Name() string {
}

type lintRedefinesBuiltinID struct {
constsAndVars map[string]bool
funcs map[string]bool
types map[string]bool
onFailure func(lint.Failure)
onFailure func(lint.Failure)
}

func (w *lintRedefinesBuiltinID) Visit(node ast.Node) ast.Visitor {
switch n := node.(type) {
case *ast.GenDecl:
if n.Tok != token.TYPE {
return nil // skip if not type declaration
}
typeSpec, ok := n.Specs[0].(*ast.TypeSpec)
if !ok {
return nil
}
id := typeSpec.Name.Name
if w.types[id] {
w.addFailure(n, fmt.Sprintf("redefinition of the built-in type %s", id))
switch n.Tok {
case token.TYPE:
typeSpec, ok := n.Specs[0].(*ast.TypeSpec)
if !ok {
return nil
}
id := typeSpec.Name.Name
if ok, bt := w.isBuiltIn(id); ok {
w.addFailure(n, fmt.Sprintf("redefinition of the built-in %s %s", bt, id))
}
case token.VAR, token.CONST:
for _, vs := range n.Specs {
valSpec, ok := vs.(*ast.ValueSpec)
if !ok {
continue
}
for _, name := range valSpec.Names {
if ok, bt := w.isBuiltIn(name.Name); ok {
w.addFailure(n, fmt.Sprintf("redefinition of the built-in %s %s", bt, name))
}
}
}
default:
return nil // skip if not type/var/const declaration
}

case *ast.FuncDecl:
if n.Recv != nil {
return w // skip methods
}

id := n.Name.Name
if w.funcs[id] {
w.addFailure(n, fmt.Sprintf("redefinition of the built-in function %s", id))
if ok, bt := w.isBuiltIn(id); ok {
w.addFailure(n, fmt.Sprintf("redefinition of the built-in %s %s", bt, id))
}
case *ast.AssignStmt:
for _, e := range n.Lhs {
Expand All @@ -121,13 +134,20 @@ func (w *lintRedefinesBuiltinID) Visit(node ast.Node) ast.Visitor {
continue
}

if w.constsAndVars[id.Name] {
if ok, bt := w.isBuiltIn(id.Name); ok {
var msg string
if n.Tok == token.DEFINE {
msg = fmt.Sprintf("assignment creates a shadow of built-in identifier %s", id.Name)
} else {
msg = fmt.Sprintf("assignment modifies built-in identifier %s", id.Name)
println(bt, id.Name)
switch bt {
case "constant or variable":
if n.Tok == token.DEFINE {
msg = fmt.Sprintf("assignment creates a shadow of built-in identifier %s", id.Name)
} else {
msg = fmt.Sprintf("assignment modifies built-in identifier %s", id.Name)
}
default:
msg = fmt.Sprintf("redefinition of the built-in %s %s", bt, id)
}

w.addFailure(n, msg)
}
}
Expand All @@ -144,3 +164,19 @@ func (w lintRedefinesBuiltinID) addFailure(node ast.Node, msg string) {
Failure: msg,
})
}

func (w lintRedefinesBuiltinID) isBuiltIn(id string) (r bool, builtInKind string) {
if builtFunctions[id] {
return true, "function"
}

if builtInConstAndVars[id] {
return true, "constant or variable"
}

if builtInTypes[id] {
return true, "type"
}

return false, ""
}
10 changes: 10 additions & 0 deletions testdata/redefines-builtin-id.go
View file
Original file line number Diff line number Diff line change
Expand Up @@ -19,3 +19,13 @@ func delete(set []int64, i int) (y []int64) { // MATCH /redefinition of the buil
}
return
}

type any int // MATCH /redefinition of the built-in type any/

func any() {} // MATCH /redefinition of the built-in type any/

var any int // MATCH /redefinition of the built-in type any/

const any = 1 // MATCH /redefinition of the built-in type any/

var i, copy int // MATCH /redefinition of the built-in function copy/

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