1 // Copyright 2018 The Go Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style
3 // license that can be found in the LICENSE file.
5 // this file contains protocol<->span converters
12 "golang.org/x/tools/internal/span"
13 errors "golang.org/x/xerrors"
16 type ColumnMapper struct {
18 Converter *span.TokenConverter
22 func URIFromSpanURI(uri span.URI) DocumentURI {
23 return DocumentURI(uri)
26 func URIFromPath(path string) DocumentURI {
27 return URIFromSpanURI(span.URIFromPath(path))
30 func (u DocumentURI) SpanURI() span.URI {
31 return span.URIFromURI(string(u))
34 func (m *ColumnMapper) Location(s span.Span) (Location, error) {
35 rng, err := m.Range(s)
37 return Location{}, err
39 return Location{URI: URIFromSpanURI(s.URI()), Range: rng}, nil
42 func (m *ColumnMapper) Range(s span.Span) (Range, error) {
43 if span.CompareURI(m.URI, s.URI()) != 0 {
44 return Range{}, errors.Errorf("column mapper is for file %q instead of %q", m.URI, s.URI())
46 s, err := s.WithAll(m.Converter)
50 start, err := m.Position(s.Start())
54 end, err := m.Position(s.End())
58 return Range{Start: start, End: end}, nil
61 func (m *ColumnMapper) Position(p span.Point) (Position, error) {
62 chr, err := span.ToUTF16Column(p, m.Content)
64 return Position{}, err
67 Line: float64(p.Line() - 1),
68 Character: float64(chr - 1),
72 func (m *ColumnMapper) Span(l Location) (span.Span, error) {
73 return m.RangeSpan(l.Range)
76 func (m *ColumnMapper) RangeSpan(r Range) (span.Span, error) {
77 start, err := m.Point(r.Start)
79 return span.Span{}, err
81 end, err := m.Point(r.End)
83 return span.Span{}, err
85 return span.New(m.URI, start, end).WithAll(m.Converter)
88 func (m *ColumnMapper) PointSpan(p Position) (span.Span, error) {
89 start, err := m.Point(p)
91 return span.Span{}, err
93 return span.New(m.URI, start, start).WithAll(m.Converter)
96 func (m *ColumnMapper) Point(p Position) (span.Point, error) {
97 line := int(p.Line) + 1
98 offset, err := m.Converter.ToOffset(line, 1)
100 return span.Point{}, err
102 lineStart := span.NewPoint(line, 1, offset)
103 return span.FromUTF16Column(lineStart, int(p.Character)+1, m.Content)
106 func IsPoint(r Range) bool {
107 return r.Start.Line == r.End.Line && r.Start.Character == r.End.Character
110 func CompareRange(a, b Range) int {
111 if r := ComparePosition(a.Start, b.Start); r != 0 {
114 return ComparePosition(a.End, b.End)
117 func ComparePosition(a, b Position) int {
124 if a.Character < b.Character {
127 if a.Character > b.Character {
133 func Intersect(a, b Range) bool {
134 if a.Start.Line > b.End.Line || a.End.Line < b.Start.Line {
137 return !((a.Start.Line == b.End.Line) && a.Start.Character > b.End.Character ||
138 (a.End.Line == b.Start.Line) && a.End.Character < b.Start.Character)
141 func (r Range) Format(f fmt.State, _ rune) {
142 fmt.Fprintf(f, "%v:%v-%v:%v", r.Start.Line, r.Start.Character, r.End.Line, r.End.Character)