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// Copyright 2018 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 lsp
import (
"context"
"go/token"
"golang.org/x/tools/internal/lsp/cache"
"golang.org/x/tools/internal/lsp/protocol"
"golang.org/x/tools/internal/lsp/source"
)
// fromProtocolURI converts a protocol.DocumentURI to a source.URI.
// TODO(rstambler): Add logic here to support Windows.
func fromProtocolURI(uri protocol.DocumentURI) source.URI {
return source.URI(uri)
}
// fromProtocolLocation converts from a protocol location to a source range.
// It will return an error if the file of the location was not valid.
// It uses fromProtocolRange to convert the start and end positions.
func fromProtocolLocation(ctx context.Context, v *cache.View, loc protocol.Location) (source.Range, error) {
f, err := v.GetFile(ctx, fromProtocolURI(loc.URI))
if err != nil {
return source.Range{}, err
}
tok, err := f.GetToken()
if err != nil {
return source.Range{}, err
}
return fromProtocolRange(tok, loc.Range), nil
}
// toProtocolLocation converts from a source range back to a protocol location.
func toProtocolLocation(fset *token.FileSet, r source.Range) protocol.Location {
tok := fset.File(r.Start)
uri := source.ToURI(tok.Name())
return protocol.Location{
URI: protocol.DocumentURI(uri),
Range: toProtocolRange(tok, r),
}
}
// fromProtocolRange converts a protocol range to a source range.
// It uses fromProtocolPosition to convert the start and end positions, which
// requires the token file the positions belongs to.
func fromProtocolRange(f *token.File, r protocol.Range) source.Range {
start := fromProtocolPosition(f, r.Start)
var end token.Pos
switch {
case r.End == r.Start:
end = start
case r.End.Line < 0:
end = token.NoPos
default:
end = fromProtocolPosition(f, r.End)
}
return source.Range{
Start: start,
End: end,
}
}
// toProtocolRange converts from a source range back to a protocol range.
func toProtocolRange(f *token.File, r source.Range) protocol.Range {
return protocol.Range{
Start: toProtocolPosition(f, r.Start),
End: toProtocolPosition(f, r.End),
}
}
// fromProtocolPosition converts a protocol position (0-based line and column
// number) to a token.Pos (byte offset value).
// It requires the token file the pos belongs to in order to do this.
func fromProtocolPosition(f *token.File, pos protocol.Position) token.Pos {
line := lineStart(f, int(pos.Line)+1)
return line + token.Pos(pos.Character) // TODO: this is wrong, bytes not characters
}
// toProtocolPosition converts from a token pos (byte offset) to a protocol
// position (0-based line and column number)
// It requires the token file the pos belongs to in order to do this.
func toProtocolPosition(f *token.File, pos token.Pos) protocol.Position {
if !pos.IsValid() {
return protocol.Position{Line: -1.0, Character: -1.0}
}
p := f.Position(pos)
return protocol.Position{
Line: float64(p.Line - 1),
Character: float64(p.Column - 1),
}
}
// fromTokenPosition converts a token.Position (1-based line and column
// number) to a token.Pos (byte offset value).
// It requires the token file the pos belongs to in order to do this.
func fromTokenPosition(f *token.File, pos token.Position) token.Pos {
line := lineStart(f, pos.Line)
return line + token.Pos(pos.Column-1) // TODO: this is wrong, bytes not characters
}
// this functionality was borrowed from the analysisutil package
func lineStart(f *token.File, line int) token.Pos {
// Use binary search to find the start offset of this line.
//
// TODO(adonovan): eventually replace this function with the
// simpler and more efficient (*go/token.File).LineStart, added
// in go1.12.
min := 0 // inclusive
max := f.Size() // exclusive
for {
offset := (min + max) / 2
pos := f.Pos(offset)
posn := f.Position(pos)
if posn.Line == line {
return pos - (token.Pos(posn.Column) - 1)
}
if min+1 >= max {
return token.NoPos
}
if posn.Line < line {
min = offset
} else {
max = offset
}
}
}
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