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format.go
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format.go
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package lsp
import (
"context"
"fmt"
"go.coder.com/go-tools/internal/lsp/protocol"
"go.coder.com/go-tools/internal/lsp/source"
"go.coder.com/go-tools/internal/span"
)
// formatRange formats a document with a given range.
func formatRange(ctx context.Context, v source.View, s span.Span) ([]protocol.TextEdit, error) {
f, m, err := newColumnMap(ctx, v, s.URI())
if err != nil {
return nil, err
}
rng, err := s.Range(m.Converter)
if err != nil {
return nil, err
}
if rng.Start == rng.End {
// If we have a single point, assume we want the whole file.
tok := f.GetToken(ctx)
if tok == nil {
return nil, fmt.Errorf("no file information for %s", f.URI())
}
rng.End = tok.Pos(tok.Size())
}
edits, err := source.Format(ctx, f, rng)
if err != nil {
return nil, err
}
return toProtocolEdits(m, edits)
}
func toProtocolEdits(m *protocol.ColumnMapper, edits []source.TextEdit) ([]protocol.TextEdit, error) {
if edits == nil {
return nil, nil
}
result := make([]protocol.TextEdit, len(edits))
for i, edit := range edits {
rng, err := m.Range(edit.Span)
if err != nil {
return nil, err
}
result[i] = protocol.TextEdit{
Range: rng,
NewText: edit.NewText,
}
}
return result, nil
}
func newColumnMap(ctx context.Context, v source.View, uri span.URI) (source.File, *protocol.ColumnMapper, error) {
f, err := v.GetFile(ctx, uri)
if err != nil {
return nil, nil, err
}
tok := f.GetToken(ctx)
if tok == nil {
return nil, nil, fmt.Errorf("no file information for %v", f.URI())
}
m := protocol.NewColumnMapper(f.URI(), f.GetFileSet(ctx), tok, f.GetContent(ctx))
return f, m, nil
}