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Copy pathimporter.go
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76 lines (71 loc) · 1.86 KB
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/*
* Copyright (c) 2022 The GoPlus Authors (goplus.org). All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package igop
import (
"fmt"
"go/importer"
"go/types"
)
type Importer struct {
ctx *Context
pkgs map[string]*types.Package
importing map[string]bool
defaultImpl types.Importer
}
func NewImporter(ctx *Context) *Importer {
return &Importer{
ctx: ctx,
pkgs: make(map[string]*types.Package),
importing: make(map[string]bool),
defaultImpl: importer.Default(),
}
}
func (i *Importer) Import(path string) (*types.Package, error) {
if pkg, ok := i.pkgs[path]; ok {
return pkg, nil
}
if i.importing[path] {
return nil, fmt.Errorf("cycle importing package %q", path)
}
i.importing[path] = true
defer func() {
i.importing[path] = false
}()
if pkg, err := i.ctx.Loader.Import(path); err == nil && pkg.Complete() {
i.pkgs[path] = pkg
return pkg, nil
}
if pkg, ok := i.ctx.pkgs[path]; ok {
if !pkg.Package.Complete() {
if err := pkg.Load(); err != nil {
return nil, err
}
}
i.pkgs[path] = pkg.Package
return pkg.Package, nil
}
if dir, found := i.ctx.lookupPath(path); found {
pkg, err := i.ctx.addImport(path, dir)
if err != nil {
return nil, err
}
if err := pkg.Load(); err != nil {
return nil, err
}
return pkg.Package, nil
}
return nil, ErrNotFoundPackage
}