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https://github.com/golang/go
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508f945e1a
Like the previous change to the FIle interface, we treat Read as if it were an accessor, we remember the content part but not the error part, and we may fill it in asynchronously, so this change makes it explicit. In the future we should probably trap the error in the read and push it back through another channel though, it will be the root cause of later errors. Change-Id: I3d374dd557178b4e8c5544813cd77f5c0faefe5b Reviewed-on: https://go-review.googlesource.com/c/162403 Run-TryBot: Ian Cottrell <iancottrell@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Rebecca Stambler <rstambler@golang.org>
61 lines
1.6 KiB
Go
61 lines
1.6 KiB
Go
package lsp
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import (
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"context"
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"golang.org/x/tools/internal/lsp/protocol"
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"golang.org/x/tools/internal/lsp/source"
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)
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// formatRange formats a document with a given range.
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func formatRange(ctx context.Context, v source.View, uri protocol.DocumentURI, rng *protocol.Range) ([]protocol.TextEdit, error) {
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sourceURI, err := fromProtocolURI(uri)
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if err != nil {
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return nil, err
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}
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f, err := v.GetFile(ctx, sourceURI)
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if err != nil {
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return nil, err
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}
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tok := f.GetToken()
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var r source.Range
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if rng == nil {
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r.Start = tok.Pos(0)
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r.End = tok.Pos(tok.Size())
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} else {
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r = fromProtocolRange(tok, *rng)
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}
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edits, err := source.Format(ctx, f, r)
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if err != nil {
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return nil, err
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}
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return toProtocolEdits(f, edits), nil
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}
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func toProtocolEdits(f source.File, edits []source.TextEdit) []protocol.TextEdit {
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if edits == nil {
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return nil
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}
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tok := f.GetToken()
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content := f.GetContent()
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// When a file ends with an empty line, the newline character is counted
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// as part of the previous line. This causes the formatter to insert
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// another unnecessary newline on each formatting. We handle this case by
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// checking if the file already ends with a newline character.
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hasExtraNewline := content[len(content)-1] == '\n'
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result := make([]protocol.TextEdit, len(edits))
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for i, edit := range edits {
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rng := toProtocolRange(tok, edit.Range)
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// If the edit ends at the end of the file, add the extra line.
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if hasExtraNewline && tok.Offset(edit.Range.End) == len(content) {
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rng.End.Line++
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rng.End.Character = 0
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}
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result[i] = protocol.TextEdit{
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Range: rng,
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NewText: edit.NewText,
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}
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}
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return result
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}
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