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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 hooks
import (
"github.com/sergi/go-diff/diffmatchpatch"
"golang.org/x/tools/internal/lsp/diff"
"golang.org/x/tools/internal/span"
)
func ComputeEdits(uri span.URI, before, after string) []diff.TextEdit {
diffs := diffmatchpatch.New().DiffMain(before, after, true)
edits := make([]diff.TextEdit, 0, len(diffs))
offset := 0
for _, d := range diffs {
start := span.NewPoint(0, 0, offset)
switch d.Type {
case diffmatchpatch.DiffDelete:
offset += len(d.Text)
edits = append(edits, diff.TextEdit{Span: span.New(uri, start, span.NewPoint(0, 0, offset))})
case diffmatchpatch.DiffEqual:
offset += len(d.Text)
case diffmatchpatch.DiffInsert:
edits = append(edits, diff.TextEdit{Span: span.New(uri, start, span.Point{}), NewText: d.Text})
}
}
return edits
}