80 lines
1.6 KiB
Go
Vendored
80 lines
1.6 KiB
Go
Vendored
package rule
|
|
|
|
import (
|
|
"fmt"
|
|
"go/ast"
|
|
|
|
"github.com/mgechev/revive/lint"
|
|
)
|
|
|
|
// ModifiesParamRule lints given else constructs.
|
|
type ModifiesParamRule struct{}
|
|
|
|
// Apply applies the rule to given file.
|
|
func (r *ModifiesParamRule) Apply(file *lint.File, _ lint.Arguments) []lint.Failure {
|
|
var failures []lint.Failure
|
|
|
|
onFailure := func(failure lint.Failure) {
|
|
failures = append(failures, failure)
|
|
}
|
|
|
|
w := lintModifiesParamRule{onFailure: onFailure}
|
|
ast.Walk(w, file.AST)
|
|
return failures
|
|
}
|
|
|
|
// Name returns the rule name.
|
|
func (r *ModifiesParamRule) Name() string {
|
|
return "modifies-parameter"
|
|
}
|
|
|
|
type lintModifiesParamRule struct {
|
|
params map[string]bool
|
|
onFailure func(lint.Failure)
|
|
}
|
|
|
|
func retrieveParamNames(pl []*ast.Field) map[string]bool {
|
|
result := make(map[string]bool, len(pl))
|
|
for _, p := range pl {
|
|
for _, n := range p.Names {
|
|
if n.Name == "_" {
|
|
continue
|
|
}
|
|
|
|
result[n.Name] = true
|
|
}
|
|
}
|
|
return result
|
|
}
|
|
|
|
func (w lintModifiesParamRule) Visit(node ast.Node) ast.Visitor {
|
|
switch v := node.(type) {
|
|
case *ast.FuncDecl:
|
|
w.params = retrieveParamNames(v.Type.Params.List)
|
|
case *ast.IncDecStmt:
|
|
if id, ok := v.X.(*ast.Ident); ok {
|
|
checkParam(id, &w)
|
|
}
|
|
case *ast.AssignStmt:
|
|
lhs := v.Lhs
|
|
for _, e := range lhs {
|
|
id, ok := e.(*ast.Ident)
|
|
if ok {
|
|
checkParam(id, &w)
|
|
}
|
|
}
|
|
}
|
|
|
|
return w
|
|
}
|
|
|
|
func checkParam(id *ast.Ident, w *lintModifiesParamRule) {
|
|
if w.params[id.Name] {
|
|
w.onFailure(lint.Failure{
|
|
Confidence: 0.5, // confidence is low because of shadow variables
|
|
Node: id,
|
|
Category: "bad practice",
|
|
Failure: fmt.Sprintf("parameter '%s' seems to be modified", id),
|
|
})
|
|
}
|
|
}
|