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// Copyright 2023 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 protocol
import (
"fmt"
"golang.org/x/tools/internal/diff"
)
// EditsFromDiffEdits converts diff.Edits to a non-nil slice of LSP TextEdits.
// See https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#textEditArray
func EditsFromDiffEdits(m *Mapper, edits []diff.Edit) ([]TextEdit, error) {
// LSP doesn't require TextEditArray to be sorted:
// this is the receiver's concern. But govim, and perhaps
// other clients have historically relied on the order.
edits = append([]diff.Edit(nil), edits...)
diff.SortEdits(edits)
result := make([]TextEdit, len(edits))
for i, edit := range edits {
rng, err := m.OffsetRange(edit.Start, edit.End)
if err != nil {
return nil, err
}
result[i] = TextEdit{
Range: rng,
NewText: edit.New,
}
}
return result, nil
}
// EditsToDiffEdits converts LSP TextEdits to diff.Edits.
// See https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#textEditArray
func EditsToDiffEdits(m *Mapper, edits []TextEdit) ([]diff.Edit, error) {
if edits == nil {
return nil, nil
}
result := make([]diff.Edit, len(edits))
for i, edit := range edits {
start, end, err := m.RangeOffsets(edit.Range)
if err != nil {
return nil, err
}
result[i] = diff.Edit{
Start: start,
End: end,
New: edit.NewText,
}
}
return result, nil
}
// ApplyEdits applies the patch (edits) to m.Content and returns the result.
// It also returns the edits converted to diff-package form.
func ApplyEdits(m *Mapper, edits []TextEdit) ([]byte, []diff.Edit, error) {
diffEdits, err := EditsToDiffEdits(m, edits)
if err != nil {
return nil, nil, err
}
out, err := diff.ApplyBytes(m.Content, diffEdits)
return out, diffEdits, err
}
// AsTextEdits converts a slice possibly containing AnnotatedTextEdits
// to a slice of TextEdits.
func AsTextEdits(edits []Or_TextDocumentEdit_edits_Elem) []TextEdit {
var result []TextEdit
for _, e := range edits {
var te TextEdit
if x, ok := e.Value.(AnnotatedTextEdit); ok {
te = x.TextEdit
} else if x, ok := e.Value.(TextEdit); ok {
te = x
} else {
panic(fmt.Sprintf("unexpected type %T, expected AnnotatedTextEdit or TextEdit", e.Value))
}
result = append(result, te)
}
return result
}
// AsAnnotatedTextEdits converts a slice of TextEdits
// to a slice of Or_TextDocumentEdit_edits_Elem.
// (returning a typed nil is required in server: in code_action.go and command.go))
func AsAnnotatedTextEdits(edits []TextEdit) []Or_TextDocumentEdit_edits_Elem {
if edits == nil {
return []Or_TextDocumentEdit_edits_Elem{}
}
var result []Or_TextDocumentEdit_edits_Elem
for _, e := range edits {
result = append(result, Or_TextDocumentEdit_edits_Elem{
Value: TextEdit{
Range: e.Range,
NewText: e.NewText,
},
})
}
return result
}
// fileHandle abstracts file.Handle to avoid a cycle.
type fileHandle interface {
URI() DocumentURI
Version() int32
}
// NewWorkspaceEdit constructs a WorkspaceEdit from a list of document changes.
//
// Any ChangeAnnotations must be added after.
func NewWorkspaceEdit(changes ...DocumentChange) *WorkspaceEdit {
return &WorkspaceEdit{DocumentChanges: changes}
}
// DocumentChangeEdit constructs a DocumentChange containing a
// TextDocumentEdit from a file.Handle and a list of TextEdits.
func DocumentChangeEdit(fh fileHandle, textedits []TextEdit) DocumentChange {
return DocumentChange{
TextDocumentEdit: &TextDocumentEdit{
TextDocument: OptionalVersionedTextDocumentIdentifier{
Version: fh.Version(),
TextDocumentIdentifier: TextDocumentIdentifier{URI: fh.URI()},
},
Edits: AsAnnotatedTextEdits(textedits),
},
}
}
// DocumentChangeCreate constructs a DocumentChange that creates a file.
func DocumentChangeCreate(uri DocumentURI) DocumentChange {
return DocumentChange{
CreateFile: &CreateFile{
Kind: "create",
URI: uri,
},
}
}
// DocumentChangeRename constructs a DocumentChange that renames a file.
func DocumentChangeRename(src, dst DocumentURI) DocumentChange {
return DocumentChange{
RenameFile: &RenameFile{
Kind: "rename",
OldURI: src,
NewURI: dst,
},
}
}
// SelectCompletionTextEdit returns insert or replace mode TextEdit
// included in the completion item.
func SelectCompletionTextEdit(item CompletionItem, useReplaceMode bool) (TextEdit, error) {
var edit TextEdit
switch typ := item.TextEdit.Value.(type) {
case TextEdit: // old style completion item.
return typ, nil
case InsertReplaceEdit:
if useReplaceMode {
return TextEdit{
NewText: typ.NewText,
Range: typ.Replace,
}, nil
} else {
return TextEdit{
NewText: typ.NewText,
Range: typ.Insert,
}, nil
}
default:
return edit, fmt.Errorf("unsupported edit type %T", typ)
}
}
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