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65 lines
1.4 KiB
65 lines
1.4 KiB
package rule
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import (
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"go/ast"
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"github.com/mgechev/revive/lint"
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)
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// EmptyBlockRule lints given else constructs.
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type EmptyBlockRule struct{}
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// Apply applies the rule to given file.
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func (r *EmptyBlockRule) 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 := lintEmptyBlock{make(map[*ast.BlockStmt]bool, 0), 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 *EmptyBlockRule) Name() string {
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return "empty-block"
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}
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type lintEmptyBlock struct {
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ignore map[*ast.BlockStmt]bool
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onFailure func(lint.Failure)
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}
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func (w lintEmptyBlock) Visit(node ast.Node) ast.Visitor {
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switch n := node.(type) {
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case *ast.FuncDecl:
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w.ignore[n.Body] = true
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return w
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case *ast.FuncLit:
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w.ignore[n.Body] = true
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return w
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case *ast.RangeStmt:
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if len(n.Body.List) == 0 {
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w.onFailure(lint.Failure{
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Confidence: 0.9,
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Node: n,
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Category: "logic",
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Failure: "this block is empty, you can remove it",
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})
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return nil // skip visiting the range subtree (it will produce a duplicated failure)
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}
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case *ast.BlockStmt:
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if !w.ignore[n] && len(n.List) == 0 {
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w.onFailure(lint.Failure{
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Confidence: 1,
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Node: n,
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Category: "logic",
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Failure: "this block is empty, you can remove it",
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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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