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b917058f11
This makes it so the diff package is depended on by all implementations, rather than the diff package having to depend on the default myers implementation. Change-Id: I04b9caee6ff1017fa8e5476a7434e4b0e17753c3 Reviewed-on: https://go-review.googlesource.com/c/tools/+/198379 Reviewed-by: Rebecca Stambler <rstambler@golang.org>
74 lines
1.8 KiB
Go
74 lines
1.8 KiB
Go
// Copyright 2019 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package myers
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import (
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"fmt"
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"strings"
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"golang.org/x/tools/internal/lsp/diff"
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"golang.org/x/tools/internal/span"
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)
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func init() {
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diff.ToUnified = myersToUnified
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}
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func ComputeEdits(uri span.URI, before, after string) []diff.TextEdit {
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u := SplitLines(before)
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f := SplitLines(after)
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return myersDiffToEdits(uri, Operations(u, f))
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}
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func myersToUnified(from, to string, before string, edits []diff.TextEdit) string {
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u := SplitLines(before)
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ops := myersEditsToDiff(edits)
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return fmt.Sprint(ToUnified(from, to, u, ops))
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}
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func myersDiffToEdits(uri span.URI, ops []*Op) []diff.TextEdit {
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edits := make([]diff.TextEdit, 0, len(ops))
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for _, op := range ops {
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s := span.New(uri, span.NewPoint(op.I1+1, 1, 0), span.NewPoint(op.I2+1, 1, 0))
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switch op.Kind {
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case diff.Delete:
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// Delete: unformatted[i1:i2] is deleted.
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edits = append(edits, diff.TextEdit{Span: s})
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case diff.Insert:
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// Insert: formatted[j1:j2] is inserted at unformatted[i1:i1].
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if content := strings.Join(op.Content, ""); content != "" {
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edits = append(edits, diff.TextEdit{Span: s, NewText: content})
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}
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}
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}
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return edits
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}
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func myersEditsToDiff(edits []diff.TextEdit) []*Op {
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iToJ := 0
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ops := make([]*Op, len(edits))
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for i, edit := range edits {
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i1 := edit.Span.Start().Line() - 1
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i2 := edit.Span.End().Line() - 1
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kind := diff.Insert
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if edit.NewText == "" {
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kind = diff.Delete
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}
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ops[i] = &Op{
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Kind: kind,
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Content: SplitLines(edit.NewText),
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I1: i1,
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I2: i2,
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J1: i1 + iToJ,
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}
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if kind == diff.Insert {
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iToJ += len(ops[i].Content)
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} else {
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iToJ -= i2 - i1
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}
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}
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return ops
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}
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