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fix.go
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fix.go
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// Copyright 2013 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 imports
import (
"bytes"
"context"
"fmt"
"go/ast"
"go/build"
"go/parser"
"go/token"
"io/ioutil"
"os"
"path"
"path/filepath"
"reflect"
"runtime"
"sort"
"strconv"
"strings"
"sync"
"unicode"
"unicode/utf8"
"github.com/charlievieth/imports/gocommand"
"github.com/charlievieth/imports/gopathwalk"
"golang.org/x/tools/go/ast/astutil"
)
// importToGroup is a list of functions which map from an import path to
// a group number.
var importToGroup = []func(localPrefix, importPath string) (num int, ok bool){
func(localPrefix, importPath string) (num int, ok bool) {
if localPrefix == "" {
return
}
for _, p := range strings.Split(localPrefix, ",") {
if strings.HasPrefix(importPath, p) || strings.TrimSuffix(p, "/") == importPath {
return 3, true
}
}
return
},
func(_, importPath string) (num int, ok bool) {
if strings.HasPrefix(importPath, "appengine") {
return 2, true
}
return
},
func(_, importPath string) (num int, ok bool) {
firstComponent := strings.Split(importPath, "/")[0]
if strings.Contains(firstComponent, ".") {
return 1, true
}
return
},
}
func importGroup(localPrefix, importPath string) int {
for _, fn := range importToGroup {
if n, ok := fn(localPrefix, importPath); ok {
return n
}
}
return 0
}
type ImportFixType int
const (
AddImport ImportFixType = iota
DeleteImport
SetImportName
)
type ImportFix struct {
// StmtInfo represents the import statement this fix will add, remove, or change.
StmtInfo ImportInfo
// IdentName is the identifier that this fix will add or remove.
IdentName string
// FixType is the type of fix this is (AddImport, DeleteImport, SetImportName).
FixType ImportFixType
Relevance float64 // see pkg
}
// An ImportInfo represents a single import statement.
type ImportInfo struct {
ImportPath string // import path, e.g. "crypto/rand".
Name string // import name, e.g. "crand", or "" if none.
}
// A packageInfo represents what's known about a package.
type packageInfo struct {
name string // real package name, if known.
exports map[string]bool // known exports.
}
// parseOtherFiles parses all the Go files in srcDir except filename, including
// test files if filename looks like a test.
func parseOtherFiles(fset *token.FileSet, srcDir, filename string) []*ast.File {
// This could use go/packages but it doesn't buy much, and it fails
// with https://golang.org/issue/26296 in LoadFiles mode in some cases.
considerTests := strings.HasSuffix(filename, "_test.go")
fileBase := filepath.Base(filename)
packageFileInfos, err := ioutil.ReadDir(srcDir)
if err != nil {
return nil
}
var files []*ast.File
for _, fi := range packageFileInfos {
if fi.Name() == fileBase || !strings.HasSuffix(fi.Name(), ".go") {
continue
}
if !considerTests && strings.HasSuffix(fi.Name(), "_test.go") {
continue
}
f, err := parser.ParseFile(fset, filepath.Join(srcDir, fi.Name()), nil, 0)
if err != nil {
continue
}
files = append(files, f)
}
return files
}
// addGlobals puts the names of package vars into the provided map.
func addGlobals(f *ast.File, globals map[string]bool) {
for _, decl := range f.Decls {
genDecl, ok := decl.(*ast.GenDecl)
if !ok {
continue
}
for _, spec := range genDecl.Specs {
valueSpec, ok := spec.(*ast.ValueSpec)
if !ok {
continue
}
globals[valueSpec.Names[0].Name] = true
}
}
}
// collectReferences builds a map of selector expressions, from
// left hand side (X) to a set of right hand sides (Sel).
func collectReferences(f *ast.File) references {
refs := references{}
var visitor visitFn
visitor = func(node ast.Node) ast.Visitor {
if node == nil {
return visitor
}
switch v := node.(type) {
case *ast.SelectorExpr:
xident, ok := v.X.(*ast.Ident)
if !ok {
break
}
if xident.Obj != nil {
// If the parser can resolve it, it's not a package ref.
break
}
if !ast.IsExported(v.Sel.Name) {
// Whatever this is, it's not exported from a package.
break
}
pkgName := xident.Name
r := refs[pkgName]
if r == nil {
r = make(map[string]bool)
refs[pkgName] = r
}
r[v.Sel.Name] = true
}
return visitor
}
ast.Walk(visitor, f)
return refs
}
// collectImports returns all the imports in f.
// Unnamed imports (., _) and "C" are ignored.
func collectImports(f *ast.File) []*ImportInfo {
var imports []*ImportInfo
for _, imp := range f.Imports {
var name string
if imp.Name != nil {
name = imp.Name.Name
}
if imp.Path.Value == `"C"` || name == "_" || name == "." {
continue
}
path := strings.Trim(imp.Path.Value, `"`)
imports = append(imports, &ImportInfo{
Name: name,
ImportPath: path,
})
}
return imports
}
// findMissingImport searches pass's candidates for an import that provides
// pkg, containing all of syms.
func (p *pass) findMissingImport(pkg string, syms map[string]bool) *ImportInfo {
for _, candidate := range p.candidates {
pkgInfo, ok := p.knownPackages[candidate.ImportPath]
if !ok {
continue
}
if p.importIdentifier(candidate) != pkg {
continue
}
allFound := true
for right := range syms {
if !pkgInfo.exports[right] {
allFound = false
break
}
}
if allFound {
return candidate
}
}
return nil
}
// references is set of references found in a Go file. The first map key is the
// left hand side of a selector expression, the second key is the right hand
// side, and the value should always be true.
type references map[string]map[string]bool
// A pass contains all the inputs and state necessary to fix a file's imports.
// It can be modified in some ways during use; see comments below.
type pass struct {
// Inputs. These must be set before a call to load, and not modified after.
fset *token.FileSet // fset used to parse f and its siblings.
f *ast.File // the file being fixed.
srcDir string // the directory containing f.
env *ProcessEnv // the environment to use for go commands, etc.
loadRealPackageNames bool // if true, load package names from disk rather than guessing them.
otherFiles []*ast.File // sibling files.
// Intermediate state, generated by load.
existingImports map[string]*ImportInfo
allRefs references
missingRefs references
// Inputs to fix. These can be augmented between successive fix calls.
lastTry bool // indicates that this is the last call and fix should clean up as best it can.
candidates []*ImportInfo // candidate imports in priority order.
knownPackages map[string]*packageInfo // information about all known packages.
}
// loadPackageNames saves the package names for everything referenced by imports.
func (p *pass) loadPackageNames(imports []*ImportInfo) error {
if p.env.Logf != nil {
p.env.Logf("loading package names for %v packages", len(imports))
defer func() {
p.env.Logf("done loading package names for %v packages", len(imports))
}()
}
var unknown []string
for _, imp := range imports {
if _, ok := p.knownPackages[imp.ImportPath]; ok {
continue
}
unknown = append(unknown, imp.ImportPath)
}
resolver, err := p.env.GetResolver()
if err != nil {
return err
}
names, err := resolver.loadPackageNames(unknown, p.srcDir)
if err != nil {
return err
}
for path, name := range names {
p.knownPackages[path] = &packageInfo{
name: name,
exports: map[string]bool{},
}
}
return nil
}
// importIdentifier returns the identifier that imp will introduce. It will
// guess if the package name has not been loaded, e.g. because the source
// is not available.
func (p *pass) importIdentifier(imp *ImportInfo) string {
if imp.Name != "" {
return imp.Name
}
known := p.knownPackages[imp.ImportPath]
if known != nil && known.name != "" {
return known.name
}
return ImportPathToAssumedName(imp.ImportPath)
}
// load reads in everything necessary to run a pass, and reports whether the
// file already has all the imports it needs. It fills in p.missingRefs with the
// file's missing symbols, if any, or removes unused imports if not.
func (p *pass) load() ([]*ImportFix, bool) {
p.knownPackages = map[string]*packageInfo{}
p.missingRefs = references{}
p.existingImports = map[string]*ImportInfo{}
// Load basic information about the file in question.
p.allRefs = collectReferences(p.f)
// Load stuff from other files in the same package:
// global variables so we know they don't need resolving, and imports
// that we might want to mimic.
globals := map[string]bool{}
for _, otherFile := range p.otherFiles {
// Don't load globals from files that are in the same directory
// but a different package. Using them to suggest imports is OK.
if p.f.Name.Name == otherFile.Name.Name {
addGlobals(otherFile, globals)
}
p.candidates = append(p.candidates, collectImports(otherFile)...)
}
// Resolve all the import paths we've seen to package names, and store
// f's imports by the identifier they introduce.
imports := collectImports(p.f)
if p.loadRealPackageNames {
err := p.loadPackageNames(append(imports, p.candidates...))
if err != nil {
if p.env.Logf != nil {
p.env.Logf("loading package names: %v", err)
}
return nil, false
}
}
for _, imp := range imports {
p.existingImports[p.importIdentifier(imp)] = imp
}
// Find missing references.
for left, rights := range p.allRefs {
if globals[left] {
continue
}
_, ok := p.existingImports[left]
if !ok {
p.missingRefs[left] = rights
continue
}
}
if len(p.missingRefs) != 0 {
return nil, false
}
return p.fix()
}
// fix attempts to satisfy missing imports using p.candidates. If it finds
// everything, or if p.lastTry is true, it updates fixes to add the imports it found,
// delete anything unused, and update import names, and returns true.
func (p *pass) fix() ([]*ImportFix, bool) {
// Find missing imports.
var selected []*ImportInfo
for left, rights := range p.missingRefs {
if imp := p.findMissingImport(left, rights); imp != nil {
selected = append(selected, imp)
}
}
if !p.lastTry && len(selected) != len(p.missingRefs) {
return nil, false
}
// Found everything, or giving up. Add the new imports and remove any unused.
var fixes []*ImportFix
for _, imp := range p.existingImports {
// We deliberately ignore globals here, because we can't be sure
// they're in the same package. People do things like put multiple
// main packages in the same directory, and we don't want to
// remove imports if they happen to have the same name as a var in
// a different package.
if _, ok := p.allRefs[p.importIdentifier(imp)]; !ok {
fixes = append(fixes, &ImportFix{
StmtInfo: *imp,
IdentName: p.importIdentifier(imp),
FixType: DeleteImport,
})
continue
}
// An existing import may need to update its import name to be correct.
if name := p.importSpecName(imp); name != imp.Name {
fixes = append(fixes, &ImportFix{
StmtInfo: ImportInfo{
Name: name,
ImportPath: imp.ImportPath,
},
IdentName: p.importIdentifier(imp),
FixType: SetImportName,
})
}
}
for _, imp := range selected {
fixes = append(fixes, &ImportFix{
StmtInfo: ImportInfo{
Name: p.importSpecName(imp),
ImportPath: imp.ImportPath,
},
IdentName: p.importIdentifier(imp),
FixType: AddImport,
})
}
return fixes, true
}
// importSpecName gets the import name of imp in the import spec.
//
// When the import identifier matches the assumed import name, the import name does
// not appear in the import spec.
func (p *pass) importSpecName(imp *ImportInfo) string {
// If we did not load the real package names, or the name is already set,
// we just return the existing name.
if !p.loadRealPackageNames || imp.Name != "" {
return imp.Name
}
ident := p.importIdentifier(imp)
if ident == ImportPathToAssumedName(imp.ImportPath) {
return "" // ident not needed since the assumed and real names are the same.
}
return ident
}
// apply will perform the fixes on f in order.
func apply(fset *token.FileSet, f *ast.File, fixes []*ImportFix) {
for _, fix := range fixes {
switch fix.FixType {
case DeleteImport:
astutil.DeleteNamedImport(fset, f, fix.StmtInfo.Name, fix.StmtInfo.ImportPath)
case AddImport:
astutil.AddNamedImport(fset, f, fix.StmtInfo.Name, fix.StmtInfo.ImportPath)
case SetImportName:
// Find the matching import path and change the name.
for _, spec := range f.Imports {
path := strings.Trim(spec.Path.Value, `"`)
if path == fix.StmtInfo.ImportPath {
spec.Name = &ast.Ident{
Name: fix.StmtInfo.Name,
NamePos: spec.Pos(),
}
}
}
}
}
}
// assumeSiblingImportsValid assumes that siblings' use of packages is valid,
// adding the exports they use.
func (p *pass) assumeSiblingImportsValid() {
for _, f := range p.otherFiles {
refs := collectReferences(f)
imports := collectImports(f)
importsByName := map[string]*ImportInfo{}
for _, imp := range imports {
importsByName[p.importIdentifier(imp)] = imp
}
for left, rights := range refs {
if imp, ok := importsByName[left]; ok {
if m, ok := stdlib[imp.ImportPath]; ok {
// We have the stdlib in memory; no need to guess.
rights = copyExports(m)
}
p.addCandidate(imp, &packageInfo{
// no name; we already know it.
exports: rights,
})
}
}
}
}
// addCandidate adds a candidate import to p, and merges in the information
// in pkg.
func (p *pass) addCandidate(imp *ImportInfo, pkg *packageInfo) {
p.candidates = append(p.candidates, imp)
if existing, ok := p.knownPackages[imp.ImportPath]; ok {
if existing.name == "" {
existing.name = pkg.name
}
for export := range pkg.exports {
existing.exports[export] = true
}
} else {
p.knownPackages[imp.ImportPath] = pkg
}
}
// fixImports adds and removes imports from f so that all its references are
// satisfied and there are no unused imports.
//
// This is declared as a variable rather than a function so goimports can
// easily be extended by adding a file with an init function.
var fixImports = fixImportsDefault
func fixImportsDefault(fset *token.FileSet, f *ast.File, filename string, env *ProcessEnv) error {
fixes, err := getFixes(fset, f, filename, env)
if err != nil {
return err
}
apply(fset, f, fixes)
return err
}
// getFixes gets the import fixes that need to be made to f in order to fix the imports.
// It does not modify the ast.
func getFixes(fset *token.FileSet, f *ast.File, filename string, env *ProcessEnv) ([]*ImportFix, error) {
abs, err := filepath.Abs(filename)
if err != nil {
return nil, err
}
srcDir := filepath.Dir(abs)
if env.Logf != nil {
env.Logf("fixImports(filename=%q), abs=%q, srcDir=%q ...", filename, abs, srcDir)
}
// First pass: looking only at f, and using the naive algorithm to
// derive package names from import paths, see if the file is already
// complete. We can't add any imports yet, because we don't know
// if missing references are actually package vars.
p := &pass{fset: fset, f: f, srcDir: srcDir, env: env}
if fixes, done := p.load(); done {
return fixes, nil
}
otherFiles := parseOtherFiles(fset, srcDir, filename)
// Second pass: add information from other files in the same package,
// like their package vars and imports.
p.otherFiles = otherFiles
if fixes, done := p.load(); done {
return fixes, nil
}
// Now we can try adding imports from the stdlib.
p.assumeSiblingImportsValid()
addStdlibCandidates(p, p.missingRefs)
if fixes, done := p.fix(); done {
return fixes, nil
}
// Third pass: get real package names where we had previously used
// the naive algorithm.
p = &pass{fset: fset, f: f, srcDir: srcDir, env: env}
p.loadRealPackageNames = true
p.otherFiles = otherFiles
if fixes, done := p.load(); done {
return fixes, nil
}
if err := addStdlibCandidates(p, p.missingRefs); err != nil {
return nil, err
}
p.assumeSiblingImportsValid()
if fixes, done := p.fix(); done {
return fixes, nil
}
// Go look for candidates in $GOPATH, etc. We don't necessarily load
// the real exports of sibling imports, so keep assuming their contents.
if err := addExternalCandidates(p, p.missingRefs, filename); err != nil {
return nil, err
}
p.lastTry = true
fixes, _ := p.fix()
return fixes, nil
}
// MaxRelevance is the highest relevance, used for the standard library.
// Chosen arbitrarily to match pre-existing gopls code.
const MaxRelevance = 7.0
// getCandidatePkgs works with the passed callback to find all acceptable packages.
// It deduplicates by import path, and uses a cached stdlib rather than reading
// from disk.
func getCandidatePkgs(ctx context.Context, wrappedCallback *scanCallback, filename, filePkg string, env *ProcessEnv) error {
notSelf := func(p *pkg) bool {
return p.packageName != filePkg || p.dir != filepath.Dir(filename)
}
goenv, err := env.goEnv()
if err != nil {
return err
}
var mu sync.Mutex // to guard asynchronous access to dupCheck
dupCheck := map[string]struct{}{}
// Start off with the standard library.
for importPath, exports := range stdlib {
p := &pkg{
dir: filepath.Join(goenv["GOROOT"], "src", importPath),
importPathShort: importPath,
packageName: path.Base(importPath),
relevance: MaxRelevance,
}
dupCheck[importPath] = struct{}{}
if notSelf(p) && wrappedCallback.dirFound(p) && wrappedCallback.packageNameLoaded(p) {
wrappedCallback.exportsLoaded(p, exports)
}
}
scanFilter := &scanCallback{
rootFound: func(root gopathwalk.Root) bool {
// Exclude goroot results -- getting them is relatively expensive, not cached,
// and generally redundant with the in-memory version.
return root.Type != gopathwalk.RootGOROOT && wrappedCallback.rootFound(root)
},
dirFound: wrappedCallback.dirFound,
packageNameLoaded: func(pkg *pkg) bool {
mu.Lock()
defer mu.Unlock()
if _, ok := dupCheck[pkg.importPathShort]; ok {
return false
}
dupCheck[pkg.importPathShort] = struct{}{}
return notSelf(pkg) && wrappedCallback.packageNameLoaded(pkg)
},
exportsLoaded: func(pkg *pkg, exports []string) {
// If we're an x_test, load the package under test's test variant.
if strings.HasSuffix(filePkg, "_test") && pkg.dir == filepath.Dir(filename) {
var err error
_, exports, err = loadExportsFromFiles(ctx, env, pkg.dir, true)
if err != nil {
return
}
}
wrappedCallback.exportsLoaded(pkg, exports)
},
}
resolver, err := env.GetResolver()
if err != nil {
return err
}
return resolver.scan(ctx, scanFilter)
}
func ScoreImportPaths(ctx context.Context, env *ProcessEnv, paths []string) (map[string]float64, error) {
result := make(map[string]float64)
resolver, err := env.GetResolver()
if err != nil {
return nil, err
}
for _, path := range paths {
result[path] = resolver.scoreImportPath(ctx, path)
}
return result, nil
}
func PrimeCache(ctx context.Context, env *ProcessEnv) error {
// Fully scan the disk for directories, but don't actually read any Go files.
callback := &scanCallback{
rootFound: func(gopathwalk.Root) bool {
return true
},
dirFound: func(pkg *pkg) bool {
return false
},
packageNameLoaded: func(pkg *pkg) bool {
return false
},
}
return getCandidatePkgs(ctx, callback, "", "", env)
}
func candidateImportName(pkg *pkg) string {
if ImportPathToAssumedName(pkg.importPathShort) != pkg.packageName {
return pkg.packageName
}
return ""
}
// GetAllCandidates calls wrapped for each package whose name starts with
// searchPrefix, and can be imported from filename with the package name filePkg.
func GetAllCandidates(ctx context.Context, wrapped func(ImportFix), searchPrefix, filename, filePkg string, env *ProcessEnv) error {
callback := &scanCallback{
rootFound: func(gopathwalk.Root) bool {
return true
},
dirFound: func(pkg *pkg) bool {
if !canUse(filename, pkg.dir) {
return false
}
// Try the assumed package name first, then a simpler path match
// in case of packages named vN, which are not uncommon.
return strings.HasPrefix(ImportPathToAssumedName(pkg.importPathShort), searchPrefix) ||
strings.HasPrefix(path.Base(pkg.importPathShort), searchPrefix)
},
packageNameLoaded: func(pkg *pkg) bool {
if !strings.HasPrefix(pkg.packageName, searchPrefix) {
return false
}
wrapped(ImportFix{
StmtInfo: ImportInfo{
ImportPath: pkg.importPathShort,
Name: candidateImportName(pkg),
},
IdentName: pkg.packageName,
FixType: AddImport,
Relevance: pkg.relevance,
})
return false
},
}
return getCandidatePkgs(ctx, callback, filename, filePkg, env)
}
// GetImportPaths calls wrapped for each package whose import path starts with
// searchPrefix, and can be imported from filename with the package name filePkg.
func GetImportPaths(ctx context.Context, wrapped func(ImportFix), searchPrefix, filename, filePkg string, env *ProcessEnv) error {
callback := &scanCallback{
rootFound: func(gopathwalk.Root) bool {
return true
},
dirFound: func(pkg *pkg) bool {
if !canUse(filename, pkg.dir) {
return false
}
return strings.HasPrefix(pkg.importPathShort, searchPrefix)
},
packageNameLoaded: func(pkg *pkg) bool {
wrapped(ImportFix{
StmtInfo: ImportInfo{
ImportPath: pkg.importPathShort,
Name: candidateImportName(pkg),
},
IdentName: pkg.packageName,
FixType: AddImport,
Relevance: pkg.relevance,
})
return false
},
}
return getCandidatePkgs(ctx, callback, filename, filePkg, env)
}
// A PackageExport is a package and its exports.
type PackageExport struct {
Fix *ImportFix
Exports []string
}
// GetPackageExports returns all known packages with name pkg and their exports.
func GetPackageExports(ctx context.Context, wrapped func(PackageExport), searchPkg, filename, filePkg string, env *ProcessEnv) error {
callback := &scanCallback{
rootFound: func(gopathwalk.Root) bool {
return true
},
dirFound: func(pkg *pkg) bool {
return pkgIsCandidate(filename, references{searchPkg: nil}, pkg)
},
packageNameLoaded: func(pkg *pkg) bool {
return pkg.packageName == searchPkg
},
exportsLoaded: func(pkg *pkg, exports []string) {
sort.Strings(exports)
wrapped(PackageExport{
Fix: &ImportFix{
StmtInfo: ImportInfo{
ImportPath: pkg.importPathShort,
Name: candidateImportName(pkg),
},
IdentName: pkg.packageName,
FixType: AddImport,
Relevance: pkg.relevance,
},
Exports: exports,
})
},
}
return getCandidatePkgs(ctx, callback, filename, filePkg, env)
}
var RequiredGoEnvVars = []string{"GO111MODULE", "GOFLAGS", "GOINSECURE", "GOMOD", "GOMODCACHE", "GONOPROXY", "GONOSUMDB", "GOPATH", "GOPROXY", "GOROOT", "GOSUMDB", "GOWORK"}
// ProcessEnv contains environment variables and settings that affect the use of
// the go command, the go/build package, etc.
type ProcessEnv struct {
GocmdRunner *gocommand.Runner
BuildFlags []string
ModFlag string
ModFile string
// Env overrides the OS environment, and can be used to specify
// GOPROXY, GO111MODULE, etc. PATH cannot be set here, because
// exec.Command will not honor it.
// Specifying all of RequiredGoEnvVars avoids a call to `go env`.
Env map[string]string
WorkingDir string
// If Logf is non-nil, debug logging is enabled through this function.
Logf func(format string, args ...interface{})
initialized bool
resolver Resolver
}
func (e *ProcessEnv) goEnv() (map[string]string, error) {
if err := e.init(); err != nil {
return nil, err
}
return e.Env, nil
}
func (e *ProcessEnv) matchFile(dir, name string) (bool, error) {
bctx, err := e.buildContext()
if err != nil {
return false, err
}
return bctx.MatchFile(dir, name)
}
// CopyConfig copies the env's configuration into a new env.
func (e *ProcessEnv) CopyConfig() *ProcessEnv {
copy := &ProcessEnv{
GocmdRunner: e.GocmdRunner,
initialized: e.initialized,
BuildFlags: e.BuildFlags,
Logf: e.Logf,
WorkingDir: e.WorkingDir,
resolver: nil,
Env: map[string]string{},
}
for k, v := range e.Env {
copy.Env[k] = v
}
return copy
}
func (e *ProcessEnv) init() error {
if e.initialized {
return nil
}
foundAllRequired := true
for _, k := range RequiredGoEnvVars {
if _, ok := e.Env[k]; !ok {
foundAllRequired = false
break
}
}
if foundAllRequired {
e.initialized = true
return nil
}
if e.Env == nil {
e.Env = map[string]string{}
}
goEnv, err := e.goCmdEnv(context.TODO())
if err != nil {
return err
}
if e.Env == nil {
e.Env = make(map[string]string, len(goEnv))
}
for k, v := range goEnv {
e.Env[k] = v
}
e.initialized = true
return nil
}
func (e *ProcessEnv) env() []string {
env := make([]string, 0, len(e.Env)) // the gocommand package will prepend os.Environ.
for k, v := range e.Env {
env = append(env, k+"="+v)
}
return env
}
func (e *ProcessEnv) GetResolver() (Resolver, error) {
if e.resolver != nil {
return e.resolver, nil
}
if err := e.init(); err != nil {
return nil, err
}
if len(e.Env["GOMOD"]) == 0 {
e.resolver = newGopathResolver(e)
return e.resolver, nil
}
e.resolver = newModuleResolver(e)
return e.resolver, nil
}
func (e *ProcessEnv) buildContext() (*build.Context, error) {
ctx := build.Default
goenv, err := e.goEnv()
if err != nil {
return nil, err
}
ctx.GOROOT = goenv["GOROOT"]
ctx.GOPATH = goenv["GOPATH"]
// As of Go 1.14, build.Context has a Dir field
// (see golang.org/issue/34860).
// Populate it only if present.
rc := reflect.ValueOf(&ctx).Elem()
dir := rc.FieldByName("Dir")
if dir.IsValid() && dir.Kind() == reflect.String {
dir.SetString(e.WorkingDir)
}
// Since Go 1.11, go/build.Context.Import may invoke 'go list' depending on
// the value in GO111MODULE in the process's environment. We always want to
// run in GOPATH mode when calling Import, so we need to prevent this from
// happening. In Go 1.16, GO111MODULE defaults to "on", so this problem comes
// up more frequently.
//
// HACK: setting any of the Context I/O hooks prevents Import from invoking
// 'go list', regardless of GO111MODULE. This is undocumented, but it's
// unlikely to change before GOPATH support is removed.
//
// WARN: using our own faster version of ioutil.ReadDir here
ctx.ReadDir = readDir
return &ctx, nil
}
func (e *ProcessEnv) invokeGo(ctx context.Context, verb string, args ...string) (*bytes.Buffer, error) {
inv := gocommand.Invocation{
Verb: verb,
Args: args,
BuildFlags: e.BuildFlags,
Env: e.env(),
Logf: e.Logf,
WorkingDir: e.WorkingDir,
}
return e.GocmdRunner.Run(ctx, inv)
}
func addStdlibCandidates(pass *pass, refs references) error {
goenv, err := pass.env.goEnv()
if err != nil {
return err
}
add := func(pkg string) {
// Prevent self-imports.
if path.Base(pkg) == pass.f.Name.Name && filepath.Join(goenv["GOROOT"], "src", pkg) == pass.srcDir {
return
}
exports := copyExports(stdlib[pkg])
pass.addCandidate(
&ImportInfo{ImportPath: pkg},
&packageInfo{name: path.Base(pkg), exports: exports})
}
for left := range refs {
if left == "rand" {
// Make sure we try crypto/rand before math/rand.
add("crypto/rand")
add("math/rand")
continue
}
for importPath := range stdlib {
if path.Base(importPath) == left {
add(importPath)
}
}
}
return nil
}
// A Resolver does the build-system-specific parts of goimports.
type Resolver interface {
// loadPackageNames loads the package names in importPaths.
loadPackageNames(importPaths []string, srcDir string) (map[string]string, error)
// scan works with callback to search for packages. See scanCallback for details.
scan(ctx context.Context, callback *scanCallback) error
// loadExports returns the set of exported symbols in the package at dir.