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// Copyright 2020 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 main
import (
"go/ast"
"strings"
)
func init() {
register(buildtagFix)
}
const buildtagGoVersionCutoff = 1_18
var buildtagFix = fix{
name: "buildtag",
date: "2021-08-25",
f: buildtag,
desc: `Remove +build comments from modules using Go 1.18 or later`,
}
func buildtag(f *ast.File) bool {
if goVersion < buildtagGoVersionCutoff {
return false
}
// File is already gofmt-ed, so we know that if there are +build lines,
// they are in a comment group that starts with a //go:build line followed
// by a blank line. While we cannot delete comments from an AST and
// expect consistent output in general, this specific case - deleting only
// some lines from a comment block - does format correctly.
fixed := false
for _, g := range f.Comments {
sawGoBuild := false
for i, c := range g.List {
if strings.HasPrefix(c.Text, "//go:build ") {
sawGoBuild = true
}
if sawGoBuild && strings.HasPrefix(c.Text, "// +build ") {
g.List = g.List[:i]
fixed = true
break
}
}
}
return fixed
}