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// Copyright 2011 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 build
import (
"go/parser"
"go/token"
"log"
"os"
"path/filepath"
"strconv"
"strings"
"runtime"
)
type DirInfo struct {
GoFiles []string // .go files in dir (excluding CgoFiles)
CgoFiles []string // .go files that import "C"
CFiles []string // .c files in dir
SFiles []string // .s files in dir
Imports []string // All packages imported by goFiles
PkgName string // Name of package in dir
}
func (d *DirInfo) IsCommand() bool {
return d.PkgName == "main"
}
// ScanDir returns a structure with details about the Go content found
// in the given directory. The file lists exclude:
//
// - files in package main (unless allowMain is true)
// - files in package documentation
// - files ending in _test.go
// - files starting with _ or .
//
// Only files that satisfy the goodOSArch function are included.
func ScanDir(dir string, allowMain bool) (info *DirInfo, err os.Error) {
f, err := os.Open(dir)
if err != nil {
return nil, err
}
dirs, err := f.Readdir(-1)
f.Close()
if err != nil {
return nil, err
}
var di DirInfo
imported := make(map[string]bool)
fset := token.NewFileSet()
for i := range dirs {
d := &dirs[i]
if strings.HasPrefix(d.Name, "_") ||
strings.HasPrefix(d.Name, ".") {
continue
}
if !goodOSArch(d.Name) {
continue
}
switch filepath.Ext(d.Name) {
case ".go":
if strings.HasSuffix(d.Name, "_test.go") {
continue
}
case ".c":
di.CFiles = append(di.CFiles, d.Name)
continue
case ".s":
di.SFiles = append(di.SFiles, d.Name)
continue
default:
continue
}
filename := filepath.Join(dir, d.Name)
pf, err := parser.ParseFile(fset, filename, nil, parser.ImportsOnly)
if err != nil {
return nil, err
}
s := string(pf.Name.Name)
if s == "main" && !allowMain {
continue
}
if s == "documentation" {
continue
}
if di.PkgName == "" {
di.PkgName = s
} else if di.PkgName != s {
// Only if all files in the directory are in package main
// do we return PkgName=="main".
// A mix of main and another package reverts
// to the original (allowMain=false) behaviour.
if s == "main" || di.PkgName == "main" {
return ScanDir(dir, false)
}
return nil, os.NewError("multiple package names in " + dir)
}
isCgo := false
for _, spec := range pf.Imports {
quoted := string(spec.Path.Value)
path, err := strconv.Unquote(quoted)
if err != nil {
log.Panicf("%s: parser returned invalid quoted string: <%s>", filename, quoted)
}
imported[path] = true
if path == "C" {
isCgo = true
}
}
if isCgo {
di.CgoFiles = append(di.CgoFiles, d.Name)
} else {
di.GoFiles = append(di.GoFiles, d.Name)
}
}
di.Imports = make([]string, len(imported))
i := 0
for p := range imported {
di.Imports[i] = p
i++
}
return &di, nil
}
// goodOSArch returns false if the filename contains a $GOOS or $GOARCH
// suffix which does not match the current system.
// The recognized filename formats are:
//
// name_$(GOOS).*
// name_$(GOARCH).*
// name_$(GOOS)_$(GOARCH).*
//
func goodOSArch(filename string) bool {
if dot := strings.Index(filename, "."); dot != -1 {
filename = filename[:dot]
}
l := strings.Split(filename, "_")
n := len(l)
if n == 0 {
return true
}
if good, known := goodOS[l[n-1]]; known {
return good
}
if good, known := goodArch[l[n-1]]; known {
if !good || n < 2 {
return false
}
good, known = goodOS[l[n-2]]
return good || !known
}
return true
}
var goodOS = make(map[string]bool)
var goodArch = make(map[string]bool)
func init() {
goodOS = make(map[string]bool)
goodArch = make(map[string]bool)
for _, v := range strings.Fields(goosList) {
goodOS[v] = v == runtime.GOOS
}
for _, v := range strings.Fields(goarchList) {
goodArch[v] = v == runtime.GOARCH
}
}
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