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package rule
import (
"go/ast"
"github.com/mgechev/revive/lint"
)
// ConfusingResultsRule lints given function declarations
type ConfusingResultsRule struct{}
// Apply applies the rule to given file.
func (r *ConfusingResultsRule) Apply(file *lint.File, _ lint.Arguments) []lint.Failure {
var failures []lint.Failure
fileAst := file.AST
walker := lintConfusingResults{
onFailure: func(failure lint.Failure) {
failures = append(failures, failure)
},
}
ast.Walk(walker, fileAst)
return failures
}
// Name returns the rule name.
func (r *ConfusingResultsRule) Name() string {
return "confusing-results"
}
type lintConfusingResults struct {
onFailure func(lint.Failure)
}
func (w lintConfusingResults) Visit(n ast.Node) ast.Visitor {
fn, ok := n.(*ast.FuncDecl)
if !ok || fn.Type.Results == nil || len(fn.Type.Results.List) < 2 {
return w
}
lastType := ""
for _, result := range fn.Type.Results.List {
if len(result.Names) > 0 {
return w
}
t, ok := result.Type.(*ast.Ident)
if !ok {
return w
}
if t.Name == lastType {
w.onFailure(lint.Failure{
Node: n,
Confidence: 1,
Category: "naming",
Failure: "unnamed results of the same type may be confusing, consider using named results",
})
break
}
lastType = t.Name
}
return w
}
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