1// Copyright 2019 The Go Authors. All rights reserved. 2// Use of this source code is governed by a BSD-style 3// license that can be found in the LICENSE file. 4 5package cmd 6 7import ( 8 "context" 9 "flag" 10 "fmt" 11 "sort" 12 13 "golang.org/x/tools/internal/lsp/protocol" 14 "golang.org/x/tools/internal/span" 15 "golang.org/x/tools/internal/tool" 16) 17 18// implementation implements the implementation verb for gopls 19type implementation struct { 20 app *Application 21} 22 23func (i *implementation) Name() string { return "implementation" } 24func (i *implementation) Usage() string { return "<position>" } 25func (i *implementation) ShortHelp() string { return "display selected identifier's implementation" } 26func (i *implementation) DetailedHelp(f *flag.FlagSet) { 27 fmt.Fprint(f.Output(), ` 28Example: 29 30 $ # 1-indexed location (:line:column or :#offset) of the target identifier 31 $ gopls implementation helper/helper.go:8:6 32 $ gopls implementation helper/helper.go:#53 33 34 gopls implementation flags are: 35`) 36 f.PrintDefaults() 37} 38 39func (i *implementation) Run(ctx context.Context, args ...string) error { 40 if len(args) != 1 { 41 return tool.CommandLineErrorf("implementation expects 1 argument (position)") 42 } 43 44 conn, err := i.app.connect(ctx) 45 if err != nil { 46 return err 47 } 48 defer conn.terminate(ctx) 49 50 from := span.Parse(args[0]) 51 file := conn.AddFile(ctx, from.URI()) 52 if file.err != nil { 53 return file.err 54 } 55 56 loc, err := file.mapper.Location(from) 57 if err != nil { 58 return err 59 } 60 61 p := protocol.ImplementationParams{ 62 TextDocumentPositionParams: protocol.TextDocumentPositionParams{ 63 TextDocument: protocol.TextDocumentIdentifier{URI: loc.URI}, 64 Position: loc.Range.Start, 65 }, 66 } 67 68 implementations, err := conn.Implementation(ctx, &p) 69 if err != nil { 70 return err 71 } 72 73 var spans []string 74 for _, impl := range implementations { 75 f := conn.AddFile(ctx, fileURI(impl.URI)) 76 span, err := f.mapper.Span(impl) 77 if err != nil { 78 return err 79 } 80 spans = append(spans, fmt.Sprint(span)) 81 } 82 sort.Strings(spans) 83 84 for _, s := range spans { 85 fmt.Println(s) 86 } 87 88 return nil 89} 90