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// Copyright 2021 The Bazel Authors. 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 main
import (
"fmt"
"strings"
)
type PackageRegistry struct {
packagesByID map[string]*FlatPackage
stdlib map[string]string
}
func NewPackageRegistry(pkgs ...*FlatPackage) *PackageRegistry {
pr := &PackageRegistry{
packagesByID: map[string]*FlatPackage{},
stdlib: map[string]string{},
}
pr.Add(pkgs...)
return pr
}
func (pr *PackageRegistry) Add(pkgs ...*FlatPackage) *PackageRegistry {
for _, pkg := range pkgs {
pr.packagesByID[pkg.ID] = pkg
if pkg.IsStdlib() {
pr.stdlib[pkg.PkgPath] = pkg.ID
}
}
return pr
}
func (pr *PackageRegistry) ResolvePaths(prf PathResolverFunc) error {
for _, pkg := range pr.packagesByID {
pkg.ResolvePaths(prf)
pkg.FilterFilesForBuildTags()
}
return nil
}
// ResolveImports adds stdlib imports to packages. This is required because
// stdlib packages are not part of the JSON file exports as bazel is unaware of
// them.
func (pr *PackageRegistry) ResolveImports() error {
resolve := func(importPath string) string {
if pkgID, ok := pr.stdlib[importPath]; ok {
return pkgID
}
return ""
}
for _, pkg := range pr.packagesByID {
if err := pkg.ResolveImports(resolve); err != nil {
return err
}
}
return nil
}
func (pr *PackageRegistry) walk(acc map[string]*FlatPackage, root string) {
pkg := pr.packagesByID[root]
acc[pkg.ID] = pkg
for _, pkgID := range pkg.Imports {
if _, ok := acc[pkgID]; !ok {
pr.walk(acc, pkgID)
}
}
}
func (pr *PackageRegistry) Match(labels []string) ([]string, []*FlatPackage) {
roots := map[string]struct{}{}
for _, label := range labels {
if !strings.HasPrefix(label, "@") {
label = fmt.Sprintf("@%s", label)
}
roots[label] = struct{}{}
}
walkedPackages := map[string]*FlatPackage{}
retRoots := make([]string, 0, len(roots))
for rootPkg := range roots {
retRoots = append(retRoots, rootPkg)
pr.walk(walkedPackages, rootPkg)
}
retPkgs := make([]*FlatPackage, 0, len(walkedPackages))
for _, pkg := range walkedPackages {
retPkgs = append(retPkgs, pkg)
}
return retRoots, retPkgs
}
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