mirror of
https://github.com/golang/go
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27d1b4e4f3
This replaces the definition of ApplyEdits to be more like that in go vet -fix, so that we can apply the results of suggested fixes. Change-Id: Ib5724139464954e3790bc51ed1edc3ce4b2115ff Reviewed-on: https://go-review.googlesource.com/c/tools/+/193959 Run-TryBot: Michael Matloob <matloob@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Rebecca Stambler <rstambler@golang.org>
59 lines
1.6 KiB
Go
59 lines
1.6 KiB
Go
package diff
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import (
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"bytes"
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"sort"
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"golang.org/x/tools/internal/span"
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)
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func init() {
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ApplyEdits = applyEdits
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}
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func applyEdits(before string, edits []TextEdit) string {
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// Preconditions:
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// - all of the edits apply to before
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// - and all the spans for each TextEdit have the same URI
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// copy edits so we don't make a mess of the caller's slice
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s := make([]TextEdit, len(edits))
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copy(s, edits)
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edits = s
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// TODO(matloob): Initialize the Converter Once?
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var conv span.Converter = span.NewContentConverter("", []byte(before))
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offset := func(point span.Point) int {
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if point.HasOffset() {
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return point.Offset()
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}
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offset, err := conv.ToOffset(point.Line(), point.Column())
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if err != nil {
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panic(err)
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}
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return offset
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}
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// sort the copy
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sort.Slice(edits, func(i, j int) bool { return offset(edits[i].Span.Start()) < offset(edits[j].Span.Start()) })
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var after bytes.Buffer
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beforeOffset := 0
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for _, edit := range edits {
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if offset(edit.Span.Start()) < beforeOffset {
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panic("overlapping edits") // TODO(matloob): ApplyEdits doesn't return an error. What do we do?
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} else if offset(edit.Span.Start()) > beforeOffset {
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after.WriteString(before[beforeOffset:offset(edit.Span.Start())])
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beforeOffset = offset(edit.Span.Start())
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}
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// offset(edit.Span.Start) is now equal to beforeOffset
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after.WriteString(edit.NewText)
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beforeOffset += offset(edit.Span.End()) - offset(edit.Span.Start())
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}
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if beforeOffset < len(before) {
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after.WriteString(before[beforeOffset:])
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beforeOffset = len(before[beforeOffset:]) // just to preserve invariants
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}
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return after.String()
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}
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