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|
package rule
import (
"go/ast"
"github.com/mgechev/revive/lint"
)
// EmptyBlockRule lints given else constructs.
type EmptyBlockRule struct{}
// Apply applies the rule to given file.
func (r *EmptyBlockRule) Apply(file *lint.File, _ lint.Arguments) []lint.Failure {
var failures []lint.Failure
onFailure := func(failure lint.Failure) {
failures = append(failures, failure)
}
w := lintEmptyBlock{make([]*ast.BlockStmt, 0), onFailure}
ast.Walk(w, file.AST)
return failures
}
// Name returns the rule name.
func (r *EmptyBlockRule) Name() string {
return "empty-block"
}
type lintEmptyBlock struct {
ignore []*ast.BlockStmt
onFailure func(lint.Failure)
}
func (w lintEmptyBlock) Visit(node ast.Node) ast.Visitor {
fd, ok := node.(*ast.FuncDecl)
if ok {
w.ignore = append(w.ignore, fd.Body)
return w
}
fl, ok := node.(*ast.FuncLit)
if ok {
w.ignore = append(w.ignore, fl.Body)
return w
}
block, ok := node.(*ast.BlockStmt)
if !ok {
return w
}
if mustIgnore(block, w.ignore) {
return w
}
if len(block.List) == 0 {
w.onFailure(lint.Failure{
Confidence: 1,
Node: block,
Category: "logic",
Failure: "this block is empty, you can remove it",
})
}
return w
}
func mustIgnore(block *ast.BlockStmt, blackList []*ast.BlockStmt) bool {
for _, b := range blackList {
if b == block {
return true
}
}
return false
}
|
