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// Copyright 2015 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 importer provides access to export data importers.
package importer
import (
// A Lookup function returns a reader to access package data for
// a given import path, or an error if no matching package is found.
type Lookup func(path string) (io.ReadCloser, error)
// For returns an Importer for the given compiler and lookup interface,
// or nil. Supported compilers are "gc", and "gccgo". If lookup is nil,
// the default package lookup mechanism for the given compiler is used.
func For(compiler string, lookup Lookup) types.Importer {
switch compiler {
case "gc":
if lookup == nil {
return make(gcimports)
panic("gc importer for custom import path lookup not yet implemented")
case "gccgo":
if lookup == nil {
var inst gccgoimporter.GccgoInstallation
if err := inst.InitFromDriver("gccgo"); err != nil {
return nil
return &gccgoimports{
packages: make(map[string]*types.Package),
importer: inst.GetImporter(nil, nil),
panic("gccgo importer for custom import path lookup not yet implemented")
// compiler not supported
return nil
// Default returns an Importer for the compiler that built the running binary.
func Default() types.Importer {
return For(runtime.Compiler, nil)
// gc support
type gcimports map[string]*types.Package
func (m gcimports) Import(path string) (*types.Package, error) {
return gcimporter.Import(m, path)
// gccgo support
type gccgoimports struct {
packages map[string]*types.Package
importer gccgoimporter.Importer
func (m *gccgoimports) Import(path string) (*types.Package, error) {
return m.importer(m.packages, path)