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// Copyright 2010 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.
// Wrappers for Go parser.
package main
import (
"path"
"os"
"log"
"strings"
"strconv"
"go/ast"
"go/parser"
)
type dirInfo struct {
goFiles []string // .go files within dir (including cgoFiles)
cgoFiles []string // .go files that import "C"
cFiles []string // .c files within dir
imports []string // All packages imported by goFiles
pkgName string // Name of package within dir
}
// scanDir returns a structure with details about the Go content found
// in the given directory. The list of files will NOT contain the
// following entries:
//
// - Files in package main (unless allowMain is true)
// - Files ending in _test.go
// - Files starting with _ (temporary)
// - Files containing .cgo in their names
//
// The imports map keys are package paths imported by listed Go files,
// and the values are the Go files importing the respective package paths.
func scanDir(dir string, allowMain bool) (info *dirInfo, err os.Error) {
f, err := os.Open(dir, os.O_RDONLY, 0)
if err != nil {
return nil, err
}
dirs, err := f.Readdir(-1)
f.Close()
if err != nil {
return nil, err
}
goFiles := make([]string, 0, len(dirs))
cgoFiles := make([]string, 0, len(dirs))
cFiles := make([]string, 0, len(dirs))
importsm := make(map[string]bool)
pkgName := ""
for i := range dirs {
d := &dirs[i]
if strings.HasPrefix(d.Name, "_") || strings.Index(d.Name, ".cgo") != -1 {
continue
}
if strings.HasSuffix(d.Name, ".c") {
cFiles = append(cFiles, d.Name)
continue
}
if !strings.HasSuffix(d.Name, ".go") || strings.HasSuffix(d.Name, "_test.go") {
continue
}
filename := path.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 pkgName == "" {
pkgName = s
} else if 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" || pkgName == "main" {
return scanDir(dir, false)
}
return nil, os.ErrorString("multiple package names in " + dir)
}
goFiles = append(goFiles, d.Name)
for _, decl := range pf.Decls {
for _, spec := range decl.(*ast.GenDecl).Specs {
quoted := string(spec.(*ast.ImportSpec).Path.Value)
unquoted, err := strconv.Unquote(quoted)
if err != nil {
log.Panicf("%s: parser returned invalid quoted string: <%s>", filename, quoted)
}
importsm[unquoted] = true
if unquoted == "C" {
cgoFiles = append(cgoFiles, d.Name)
}
}
}
}
imports := make([]string, len(importsm))
i := 0
for p := range importsm {
imports[i] = p
i++
}
return &dirInfo{goFiles, cgoFiles, cFiles, imports, pkgName}, nil
}
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