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// Copyright 2023 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package defers
import (
_ "embed"
"go/ast"
"golang.org/x/tools/go/analysis"
"golang.org/x/tools/go/analysis/passes/inspect"
"golang.org/x/tools/go/analysis/passes/internal/analysisutil"
"golang.org/x/tools/go/ast/inspector"
"golang.org/x/tools/go/types/typeutil"
)
//go:embed doc.go
var doc string
// Analyzer is the defers analyzer.
var Analyzer = &analysis.Analyzer{
Name: "defers",
Requires: []*analysis.Analyzer{inspect.Analyzer},
URL: "https://pkg.go.dev/golang.org/x/tools/go/analysis/passes/defers",
Doc: analysisutil.MustExtractDoc(doc, "defers"),
Run: run,
}
func run(pass *analysis.Pass) (interface{}, error) {
if !analysisutil.Imports(pass.Pkg, "time") {
return nil, nil
}
checkDeferCall := func(node ast.Node) bool {
switch v := node.(type) {
case *ast.CallExpr:
if analysisutil.IsFunctionNamed(typeutil.StaticCallee(pass.TypesInfo, v), "time", "Since") {
pass.Reportf(v.Pos(), "call to time.Since is not deferred")
}
case *ast.FuncLit:
return false // prune
}
return true
}
inspect := pass.ResultOf[inspect.Analyzer].(*inspector.Inspector)
nodeFilter := []ast.Node{
(*ast.DeferStmt)(nil),
}
inspect.Preorder(nodeFilter, func(n ast.Node) {
d := n.(*ast.DeferStmt)
ast.Inspect(d.Call, checkDeferCall)
})
return nil, nil
}