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// Copyright 2022 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 checker_test
import (
"go/ast"
"io/ioutil"
"path/filepath"
"testing"
"golang.org/x/tools/go/analysis"
"golang.org/x/tools/go/analysis/analysistest"
"golang.org/x/tools/go/analysis/internal/checker"
"golang.org/x/tools/go/analysis/passes/inspect"
"golang.org/x/tools/go/ast/inspector"
"golang.org/x/tools/internal/testenv"
)
// TestStartFixes make sure modifying the first character
// of the file takes effect.
func TestStartFixes(t *testing.T) {
testenv.NeedsGoPackages(t)
files := map[string]string{
"comment/doc.go": `/* Package comment */
package comment
`}
want := `// Package comment
package comment
`
testdata, cleanup, err := analysistest.WriteFiles(files)
if err != nil {
t.Fatal(err)
}
path := filepath.Join(testdata, "src/comment/doc.go")
checker.Fix = true
checker.Run([]string{"file=" + path}, []*analysis.Analyzer{commentAnalyzer})
contents, err := ioutil.ReadFile(path)
if err != nil {
t.Fatal(err)
}
got := string(contents)
if got != want {
t.Errorf("contents of rewritten file\ngot: %s\nwant: %s", got, want)
}
defer cleanup()
}
var commentAnalyzer = &analysis.Analyzer{
Name: "comment",
Requires: []*analysis.Analyzer{inspect.Analyzer},
Run: commentRun,
}
func commentRun(pass *analysis.Pass) (interface{}, error) {
const (
from = "/* Package comment */"
to = "// Package comment"
)
inspect := pass.ResultOf[inspect.Analyzer].(*inspector.Inspector)
inspect.Preorder(nil, func(n ast.Node) {
if n, ok := n.(*ast.Comment); ok && n.Text == from {
pass.Report(analysis.Diagnostic{
Pos: n.Pos(),
End: n.End(),
SuggestedFixes: []analysis.SuggestedFix{{
TextEdits: []analysis.TextEdit{{
Pos: n.Pos(),
End: n.End(),
NewText: []byte(to),
}},
}},
})
}
})
return nil, nil
}
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