blob: d78e53fd835dcb0d6d7f4283d118128205fe1bdb [file] [log] [blame]
// Copyright 2018 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 lsp
import (
"context"
"fmt"
"sort"
"strings"
"golang.org/x/tools/internal/imports"
"golang.org/x/tools/internal/lsp/protocol"
"golang.org/x/tools/internal/lsp/source"
"golang.org/x/tools/internal/lsp/telemetry"
"golang.org/x/tools/internal/span"
"golang.org/x/tools/internal/telemetry/log"
errors "golang.org/x/xerrors"
)
func (s *Server) codeAction(ctx context.Context, params *protocol.CodeActionParams) ([]protocol.CodeAction, error) {
uri := span.NewURI(params.TextDocument.URI)
view, err := s.session.ViewOf(uri)
if err != nil {
return nil, err
}
snapshot := view.Snapshot()
fh, err := snapshot.GetFile(uri)
if err != nil {
return nil, err
}
// Determine the supported actions for this file kind.
supportedCodeActions, ok := view.Options().SupportedCodeActions[fh.Identity().Kind]
if !ok {
return nil, fmt.Errorf("no supported code actions for %v file kind", fh.Identity().Kind)
}
// The Only field of the context specifies which code actions the client wants.
// If Only is empty, assume that the client wants all of the possible code actions.
var wanted map[protocol.CodeActionKind]bool
if len(params.Context.Only) == 0 {
wanted = supportedCodeActions
} else {
wanted = make(map[protocol.CodeActionKind]bool)
for _, only := range params.Context.Only {
wanted[only] = supportedCodeActions[only]
}
}
if len(wanted) == 0 {
return nil, errors.Errorf("no supported code action to execute for %s, wanted %v", uri, params.Context.Only)
}
var codeActions []protocol.CodeAction
switch fh.Identity().Kind {
case source.Mod:
if !wanted[protocol.SourceOrganizeImports] {
return nil, nil
}
codeActions = append(codeActions, protocol.CodeAction{
Title: "Tidy",
Kind: protocol.SourceOrganizeImports,
Command: &protocol.Command{
Title: "Tidy",
Command: "tidy",
Arguments: []interface{}{fh.Identity().URI},
},
})
case source.Go:
edits, editsPerFix, err := source.AllImportsFixes(ctx, snapshot, fh)
if err != nil {
return nil, err
}
if diagnostics := params.Context.Diagnostics; wanted[protocol.QuickFix] && len(diagnostics) > 0 {
// First, add the quick fixes reported by go/analysis.
qf, err := quickFixes(ctx, snapshot, fh, diagnostics)
if err != nil {
log.Error(ctx, "quick fixes failed", err, telemetry.File.Of(uri))
}
codeActions = append(codeActions, qf...)
// If we also have diagnostics for missing imports, we can associate them with quick fixes.
if findImportErrors(diagnostics) {
// Separate this into a set of codeActions per diagnostic, where
// each action is the addition, removal, or renaming of one import.
for _, importFix := range editsPerFix {
// Get the diagnostics this fix would affect.
if fixDiagnostics := importDiagnostics(importFix.Fix, diagnostics); len(fixDiagnostics) > 0 {
codeActions = append(codeActions, protocol.CodeAction{
Title: importFixTitle(importFix.Fix),
Kind: protocol.QuickFix,
Edit: protocol.WorkspaceEdit{
DocumentChanges: documentChanges(fh, importFix.Edits),
},
Diagnostics: fixDiagnostics,
})
}
}
}
}
if wanted[protocol.SourceOrganizeImports] && len(edits) > 0 {
codeActions = append(codeActions, protocol.CodeAction{
Title: "Organize Imports",
Kind: protocol.SourceOrganizeImports,
Edit: protocol.WorkspaceEdit{
DocumentChanges: documentChanges(fh, edits),
},
})
}
default:
// Unsupported file kind for a code action.
return nil, nil
}
return codeActions, nil
}
func (s *Server) getSupportedCodeActions() []protocol.CodeActionKind {
allCodeActionKinds := make(map[protocol.CodeActionKind]struct{})
for _, kinds := range s.session.Options().SupportedCodeActions {
for kind := range kinds {
allCodeActionKinds[kind] = struct{}{}
}
}
var result []protocol.CodeActionKind
for kind := range allCodeActionKinds {
result = append(result, kind)
}
sort.Slice(result, func(i, j int) bool {
return result[i] < result[j]
})
return result
}
type protocolImportFix struct {
fix *imports.ImportFix
edits []protocol.TextEdit
}
// findImports determines if a given diagnostic represents an error that could
// be fixed by organizing imports.
// TODO(rstambler): We need a better way to check this than string matching.
func findImportErrors(diagnostics []protocol.Diagnostic) bool {
for _, diagnostic := range diagnostics {
// "undeclared name: X" may be an unresolved import.
if strings.HasPrefix(diagnostic.Message, "undeclared name: ") {
return true
}
// "could not import: X" may be an invalid import.
if strings.HasPrefix(diagnostic.Message, "could not import: ") {
return true
}
// "X imported but not used" is an unused import.
// "X imported but not used as Y" is an unused import.
if strings.Contains(diagnostic.Message, " imported but not used") {
return true
}
}
return false
}
func importFixTitle(fix *imports.ImportFix) string {
var str string
switch fix.FixType {
case imports.AddImport:
str = fmt.Sprintf("Add import: %s %q", fix.StmtInfo.Name, fix.StmtInfo.ImportPath)
case imports.DeleteImport:
str = fmt.Sprintf("Delete import: %s %q", fix.StmtInfo.Name, fix.StmtInfo.ImportPath)
case imports.SetImportName:
str = fmt.Sprintf("Rename import: %s %q", fix.StmtInfo.Name, fix.StmtInfo.ImportPath)
}
return str
}
func importDiagnostics(fix *imports.ImportFix, diagnostics []protocol.Diagnostic) (results []protocol.Diagnostic) {
for _, diagnostic := range diagnostics {
switch {
// "undeclared name: X" may be an unresolved import.
case strings.HasPrefix(diagnostic.Message, "undeclared name: "):
ident := strings.TrimPrefix(diagnostic.Message, "undeclared name: ")
if ident == fix.IdentName {
results = append(results, diagnostic)
}
// "could not import: X" may be an invalid import.
case strings.HasPrefix(diagnostic.Message, "could not import: "):
ident := strings.TrimPrefix(diagnostic.Message, "could not import: ")
if ident == fix.IdentName {
results = append(results, diagnostic)
}
// "X imported but not used" is an unused import.
// "X imported but not used as Y" is an unused import.
case strings.Contains(diagnostic.Message, " imported but not used"):
idx := strings.Index(diagnostic.Message, " imported but not used")
importPath := diagnostic.Message[:idx]
if importPath == fmt.Sprintf("%q", fix.StmtInfo.ImportPath) {
results = append(results, diagnostic)
}
}
}
return results
}
func quickFixes(ctx context.Context, snapshot source.Snapshot, fh source.FileHandle, diagnostics []protocol.Diagnostic) ([]protocol.CodeAction, error) {
var codeActions []protocol.CodeAction
phs, err := snapshot.PackageHandles(ctx, fh)
if err != nil {
return nil, err
}
// We get the package that source.Diagnostics would've used. This is hack.
// TODO(golang/go#32443): The correct solution will be to cache diagnostics per-file per-snapshot.
ph, err := source.WidestCheckPackageHandle(phs)
if err != nil {
return nil, err
}
for _, diag := range diagnostics {
// This code assumes that the analyzer name is the Source of the diagnostic.
// If this ever changes, this will need to be addressed.
srcErr, err := snapshot.FindAnalysisError(ctx, ph.ID(), diag.Source, diag.Message, diag.Range)
if err != nil {
continue
}
for _, fix := range srcErr.SuggestedFixes {
action := protocol.CodeAction{
Title: fix.Title,
Kind: protocol.QuickFix,
Diagnostics: []protocol.Diagnostic{diag},
Edit: protocol.WorkspaceEdit{},
}
for uri, edits := range fix.Edits {
fh, err := snapshot.GetFile(uri)
if err != nil {
log.Error(ctx, "no file", err, telemetry.URI.Of(uri))
continue
}
action.Edit.DocumentChanges = append(action.Edit.DocumentChanges, documentChanges(fh, edits)...)
}
codeActions = append(codeActions, action)
}
}
return codeActions, nil
}
func documentChanges(fh source.FileHandle, edits []protocol.TextEdit) []protocol.TextDocumentEdit {
return []protocol.TextDocumentEdit{
{
TextDocument: protocol.VersionedTextDocumentIdentifier{
Version: fh.Identity().Version,
TextDocumentIdentifier: protocol.TextDocumentIdentifier{
URI: protocol.NewURI(fh.Identity().URI),
},
},
Edits: edits,
},
}
}