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// Copyright 2019 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 cmd
import (
"context"
"encoding/json"
"flag"
"fmt"
"sort"
"golang.org/x/tools/internal/lsp/protocol"
"golang.org/x/tools/internal/span"
"golang.org/x/tools/internal/tool"
)
// symbols implements the symbols verb for gopls
type symbols struct {
app *Application
}
func (r *symbols) Name() string { return "symbols" }
func (r *symbols) Usage() string { return "<file>" }
func (r *symbols) ShortHelp() string { return "display selected file's symbols" }
func (r *symbols) DetailedHelp(f *flag.FlagSet) {
fmt.Fprint(f.Output(), `
Example:
$ gopls symbols helper/helper.go
`)
f.PrintDefaults()
}
func (r *symbols) Run(ctx context.Context, args ...string) error {
if len(args) != 1 {
return tool.CommandLineErrorf("symbols expects 1 argument (position)")
}
conn, err := r.app.connect(ctx)
if err != nil {
return err
}
defer conn.terminate(ctx)
from := span.Parse(args[0])
p := protocol.DocumentSymbolParams{
TextDocument: protocol.TextDocumentIdentifier{
URI: protocol.URIFromSpanURI(from.URI()),
},
}
symbols, err := conn.DocumentSymbol(ctx, &p)
if err != nil {
return err
}
for _, s := range symbols {
if m, ok := s.(map[string]interface{}); ok {
s, err = mapToSymbol(m)
if err != nil {
return err
}
}
switch t := s.(type) {
case protocol.DocumentSymbol:
printDocumentSymbol(t)
case protocol.SymbolInformation:
printSymbolInformation(t)
}
}
return nil
}
func mapToSymbol(m map[string]interface{}) (interface{}, error) {
b, err := json.Marshal(m)
if err != nil {
return nil, err
}
if _, ok := m["selectionRange"]; ok {
var s protocol.DocumentSymbol
if err := json.Unmarshal(b, &s); err != nil {
return nil, err
}
return s, nil
}
var s protocol.SymbolInformation
if err := json.Unmarshal(b, &s); err != nil {
return nil, err
}
return s, nil
}
func printDocumentSymbol(s protocol.DocumentSymbol) {
fmt.Printf("%s %s %s\n", s.Name, s.Kind, positionToString(s.SelectionRange))
// Sort children for consistency
sort.Slice(s.Children, func(i, j int) bool {
return s.Children[i].Name < s.Children[j].Name
})
for _, c := range s.Children {
fmt.Printf("\t%s %s %s\n", c.Name, c.Kind, positionToString(c.SelectionRange))
}
}
func printSymbolInformation(s protocol.SymbolInformation) {
fmt.Printf("%s %s %s\n", s.Name, s.Kind, positionToString(s.Location.Range))
}
func positionToString(r protocol.Range) string {
return fmt.Sprintf("%v:%v-%v:%v",
r.Start.Line+1,
r.Start.Character+1,
r.End.Line+1,
r.End.Character+1,
)
}
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