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package rule
import (
"fmt"
"go/ast"
"github.com/mgechev/revive/lint"
)
// ReceiverNamingRule lints given else constructs.
type ReceiverNamingRule struct{}
// Apply applies the rule to given file.
func (r *ReceiverNamingRule) Apply(file *lint.File, _ lint.Arguments) []lint.Failure {
var failures []lint.Failure
fileAst := file.AST
walker := lintReceiverName{
onFailure: func(failure lint.Failure) {
failures = append(failures, failure)
},
typeReceiver: map[string]string{},
}
ast.Walk(walker, fileAst)
return failures
}
// Name returns the rule name.
func (r *ReceiverNamingRule) Name() string {
return "receiver-naming"
}
type lintReceiverName struct {
onFailure func(lint.Failure)
typeReceiver map[string]string
}
func (w lintReceiverName) Visit(n ast.Node) ast.Visitor {
fn, ok := n.(*ast.FuncDecl)
if !ok || fn.Recv == nil || len(fn.Recv.List) == 0 {
return w
}
names := fn.Recv.List[0].Names
if len(names) < 1 {
return w
}
name := names[0].Name
const ref = styleGuideBase + "#receiver-names"
if name == "_" {
w.onFailure(lint.Failure{
Node: n,
Confidence: 1,
Category: "naming",
Failure: "receiver name should not be an underscore, omit the name if it is unused",
})
return w
}
if name == "this" || name == "self" {
w.onFailure(lint.Failure{
Node: n,
Confidence: 1,
Category: "naming",
Failure: `receiver name should be a reflection of its identity; don't use generic names such as "this" or "self"`,
})
return w
}
recv := receiverType(fn)
if prev, ok := w.typeReceiver[recv]; ok && prev != name {
w.onFailure(lint.Failure{
Node: n,
Confidence: 1,
Category: "naming",
Failure: fmt.Sprintf("receiver name %s should be consistent with previous receiver name %s for %s", name, prev, recv),
})
return w
}
w.typeReceiver[recv] = name
return w
}
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