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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"
)
// goFiles returns a list of the *.go source files in dir, excluding
// those in package main (unless allowMain is true) or ending in
// _test.go. It also returns a map giving the packages imported by
// those files, and the package name.
// The map keys are the imported paths. The key's value
// is one file that imports that path.
func goFiles(dir string, allowMain bool) (files []string, imports map[string]string, pkgName string, err os.Error) {
f, err := os.Open(dir, os.O_RDONLY, 0)
if err != nil {
return nil, nil, "", err
}
dirs, err := f.Readdir(-1)
f.Close()
if err != nil {
return nil, nil, "", err
}
files = make([]string, 0, len(dirs))
imports = make(map[string]string)
for i := range dirs {
d := &dirs[i]
if !strings.HasSuffix(d.Name, ".go") || strings.HasSuffix(d.Name, "_test.go") {
continue
}
filename := path.Join(dir, d.Name)
pf, err := parser.ParseFile(filename, nil, nil, parser.ImportsOnly)
if err != nil {
return nil, 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 allowMain && pkgName == "main" {
return goFiles(dir, false)
}
return nil, nil, "", os.ErrorString("multiple package names in " + dir)
}
n := len(files)
files = files[0 : n+1]
files[n] = filename
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.Crashf("%s: parser returned invalid quoted string: <%s>", filename, quoted)
}
imports[unquoted] = filename
}
}
}
return files, imports, pkgName, nil
}
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