go scan 源码
golang scan 代码
文件路径：/src/cmd/go/internal/imports/scan.go
// Copyright 2018 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 imports
import (
"fmt"
"io/fs"
"path/filepath"
"sort"
"strconv"
"strings"
"cmd/go/internal/fsys"
)
func ScanDir(dir string, tags map[string]bool) ([]string, []string, error) {
infos, err := fsys.ReadDir(dir)
if err != nil {
return nil, nil, err
}
var files []string
for _, info := range infos {
name := info.Name()
// If the directory entry is a symlink, stat it to obtain the info for the
// link target instead of the link itself.
if info.Mode()&fs.ModeSymlink != 0 {
info, err = fsys.Stat(filepath.Join(dir, name))
if err != nil {
continue // Ignore broken symlinks.
}
}
if info.Mode().IsRegular() && !strings.HasPrefix(name, "_") && !strings.HasPrefix(name, ".") && strings.HasSuffix(name, ".go") && MatchFile(name, tags) {
files = append(files, filepath.Join(dir, name))
}
}
return scanFiles(files, tags, false)
}
func ScanFiles(files []string, tags map[string]bool) ([]string, []string, error) {
return scanFiles(files, tags, true)
}
func scanFiles(files []string, tags map[string]bool, explicitFiles bool) ([]string, []string, error) {
imports := make(map[string]bool)
testImports := make(map[string]bool)
numFiles := 0
Files:
for _, name := range files {
r, err := fsys.Open(name)
if err != nil {
return nil, nil, err
}
var list []string
data, err := ReadImports(r, false, &list)
r.Close()
if err != nil {
return nil, nil, fmt.Errorf("reading %s: %v", name, err)
}
// import "C" is implicit requirement of cgo tag.
// When listing files on the command line (explicitFiles=true)
// we do not apply build tag filtering but we still do apply
// cgo filtering, so no explicitFiles check here.
// Why? Because we always have, and it's not worth breaking
// that behavior now.
for _, path := range list {
if path == `"C"` && !tags["cgo"] && !tags["*"] {
continue Files
}
}
if !explicitFiles && !ShouldBuild(data, tags) {
continue
}
numFiles++
m := imports
if strings.HasSuffix(name, "_test.go") {
m = testImports
}
for _, p := range list {
q, err := strconv.Unquote(p)
if err != nil {
continue
}
m[q] = true
}
}
if numFiles == 0 {
return nil, nil, ErrNoGo
}
return keys(imports), keys(testImports), nil
}
var ErrNoGo = fmt.Errorf("no Go source files")
func keys(m map[string]bool) []string {
var list []string
for k := range m {
list = append(list, k)
}
sort.Strings(list)
return list
}
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