.config/coc/extensions/coc-go-data/tools/pkg/mod/golang.org/x/tools/gopls@v0.6.9/internal/hooks/diff.go

   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
   5 package hooks
   6
   7 import (
   8         "fmt"
   9
  10         "github.com/sergi/go-diff/diffmatchpatch"
  11         "golang.org/x/tools/internal/lsp/diff"
  12         "golang.org/x/tools/internal/span"
  13 )
  14
  15 func ComputeEdits(uri span.URI, before, after string) (edits []diff.TextEdit, err error) {
  16         // The go-diff library has an unresolved panic (see golang/go#278774).
  17         // TOOD(rstambler): Remove the recover once the issue has been fixed
  18         // upstream.
  19         defer func() {
  20                 if r := recover(); r != nil {
  21                         edits = nil
  22                         err = fmt.Errorf("unable to compute edits for %s: %s", uri.Filename(), r)
  23                 }
  24         }()
  25         diffs := diffmatchpatch.New().DiffMain(before, after, true)
  26         edits = make([]diff.TextEdit, 0, len(diffs))
  27         offset := 0
  28         for _, d := range diffs {
  29                 start := span.NewPoint(0, 0, offset)
  30                 switch d.Type {
  31                 case diffmatchpatch.DiffDelete:
  32                         offset += len(d.Text)
  33                         edits = append(edits, diff.TextEdit{Span: span.New(uri, start, span.NewPoint(0, 0, offset))})
  34                 case diffmatchpatch.DiffEqual:
  35                         offset += len(d.Text)
  36                 case diffmatchpatch.DiffInsert:
  37                         edits = append(edits, diff.TextEdit{Span: span.New(uri, start, span.Point{}), NewText: d.Text})
  38                 }
  39         }
  40         return edits, nil
  41 }