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|
//go:build ignore
// +build ignore
// Copyright 2013 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.
// Command mkindex creates the file "pkgindex.go" containing an index of the Go
// standard library. The file is intended to be built as part of the imports
// package, so that the package may be used in environments where a GOROOT is
// not available (such as App Engine).
package imports
import (
"bytes"
"fmt"
"go/ast"
"go/build"
"go/format"
"go/parser"
"go/token"
"log"
"os"
"path"
"path/filepath"
"strings"
)
var (
pkgIndex = make(map[string][]pkg)
exports = make(map[string]map[string]bool)
)
func main() {
// Don't use GOPATH.
ctx := build.Default
ctx.GOPATH = ""
// Populate pkgIndex global from GOROOT.
for _, path := range ctx.SrcDirs() {
f, err := os.Open(path)
if err != nil {
log.Print(err)
continue
}
children, err := f.Readdir(-1)
f.Close()
if err != nil {
log.Print(err)
continue
}
for _, child := range children {
if child.IsDir() {
loadPkg(path, child.Name())
}
}
}
// Populate exports global.
for _, ps := range pkgIndex {
for _, p := range ps {
e := loadExports(p.dir)
if e != nil {
exports[p.dir] = e
}
}
}
// Construct source file.
var buf bytes.Buffer
fmt.Fprint(&buf, pkgIndexHead)
fmt.Fprintf(&buf, "var pkgIndexMaster = %#v\n", pkgIndex)
fmt.Fprintf(&buf, "var exportsMaster = %#v\n", exports)
src := buf.Bytes()
// Replace main.pkg type name with pkg.
src = bytes.Replace(src, []byte("main.pkg"), []byte("pkg"), -1)
// Replace actual GOROOT with "/go".
src = bytes.Replace(src, []byte(ctx.GOROOT), []byte("/go"), -1)
// Add some line wrapping.
src = bytes.Replace(src, []byte("}, "), []byte("},\n"), -1)
src = bytes.Replace(src, []byte("true, "), []byte("true,\n"), -1)
var err error
src, err = format.Source(src)
if err != nil {
log.Fatal(err)
}
// Write out source file.
err = os.WriteFile("pkgindex.go", src, 0644)
if err != nil {
log.Fatal(err)
}
}
const pkgIndexHead = `package imports
func init() {
pkgIndexOnce.Do(func() {
pkgIndex.m = pkgIndexMaster
})
loadExports = func(dir string) map[string]bool {
return exportsMaster[dir]
}
}
`
type pkg struct {
importpath string // full pkg import path, e.g. "net/http"
dir string // absolute file path to pkg directory e.g. "/usr/lib/go/src/fmt"
}
var fset = token.NewFileSet()
func loadPkg(root, importpath string) {
shortName := path.Base(importpath)
if shortName == "testdata" {
return
}
dir := filepath.Join(root, importpath)
pkgIndex[shortName] = append(pkgIndex[shortName], pkg{
importpath: importpath,
dir: dir,
})
pkgDir, err := os.Open(dir)
if err != nil {
return
}
children, err := pkgDir.Readdir(-1)
pkgDir.Close()
if err != nil {
return
}
for _, child := range children {
name := child.Name()
if name == "" {
continue
}
if c := name[0]; c == '.' || ('0' <= c && c <= '9') {
continue
}
if child.IsDir() {
loadPkg(root, filepath.Join(importpath, name))
}
}
}
func loadExports(dir string) map[string]bool {
exports := make(map[string]bool)
buildPkg, err := build.ImportDir(dir, 0)
if err != nil {
if strings.Contains(err.Error(), "no buildable Go source files in") {
return nil
}
log.Printf("could not import %q: %v", dir, err)
return nil
}
for _, file := range buildPkg.GoFiles {
f, err := parser.ParseFile(fset, filepath.Join(dir, file), nil, 0)
if err != nil {
log.Printf("could not parse %q: %v", file, err)
continue
}
for name := range f.Scope.Objects {
if ast.IsExported(name) {
exports[name] = true
}
}
}
return exports
}
|
