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