/
span.go
142 lines (124 loc) · 3.22 KB
/
span.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
// 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.
// this file contains protocol<->span converters
package protocol
import (
"fmt"
"go/token"
"github.com/Andyfoo/golang/x/tools/internal/span"
errors "github.com/Andyfoo/golang/x/xerrors"
)
type ColumnMapper struct {
URI span.URI
Converter *span.TokenConverter
Content []byte
}
func NewURI(uri span.URI) string {
return string(uri)
}
func NewColumnMapper(uri span.URI, filename string, fset *token.FileSet, f *token.File, content []byte) *ColumnMapper {
var converter *span.TokenConverter
if f == nil {
converter = span.NewContentConverter(filename, content)
} else {
converter = span.NewTokenConverter(fset, f)
}
return &ColumnMapper{
URI: uri,
Converter: converter,
Content: content,
}
}
func (m *ColumnMapper) Location(s span.Span) (Location, error) {
rng, err := m.Range(s)
if err != nil {
return Location{}, err
}
return Location{URI: NewURI(s.URI()), Range: rng}, nil
}
func (m *ColumnMapper) Range(s span.Span) (Range, error) {
if span.CompareURI(m.URI, s.URI()) != 0 {
return Range{}, errors.Errorf("column mapper is for file %q instead of %q", m.URI, s.URI())
}
s, err := s.WithAll(m.Converter)
if err != nil {
return Range{}, err
}
start, err := m.Position(s.Start())
if err != nil {
return Range{}, err
}
end, err := m.Position(s.End())
if err != nil {
return Range{}, err
}
return Range{Start: start, End: end}, nil
}
func (m *ColumnMapper) Position(p span.Point) (Position, error) {
chr, err := span.ToUTF16Column(p, m.Content)
if err != nil {
return Position{}, err
}
return Position{
Line: float64(p.Line() - 1),
Character: float64(chr - 1),
}, nil
}
func (m *ColumnMapper) Span(l Location) (span.Span, error) {
return m.RangeSpan(l.Range)
}
func (m *ColumnMapper) RangeSpan(r Range) (span.Span, error) {
start, err := m.Point(r.Start)
if err != nil {
return span.Span{}, err
}
end, err := m.Point(r.End)
if err != nil {
return span.Span{}, err
}
return span.New(m.URI, start, end).WithAll(m.Converter)
}
func (m *ColumnMapper) PointSpan(p Position) (span.Span, error) {
start, err := m.Point(p)
if err != nil {
return span.Span{}, err
}
return span.New(m.URI, start, start).WithAll(m.Converter)
}
func (m *ColumnMapper) Point(p Position) (span.Point, error) {
line := int(p.Line) + 1
offset, err := m.Converter.ToOffset(line, 1)
if err != nil {
return span.Point{}, err
}
lineStart := span.NewPoint(line, 1, offset)
return span.FromUTF16Column(lineStart, int(p.Character)+1, m.Content)
}
func IsPoint(r Range) bool {
return r.Start.Line == r.End.Line && r.Start.Character == r.End.Character
}
func CompareRange(a, b Range) int {
if r := ComparePosition(a.Start, b.Start); r != 0 {
return r
}
return ComparePosition(a.End, b.End)
}
func ComparePosition(a, b Position) int {
if a.Line < b.Line {
return -1
}
if a.Line > b.Line {
return 1
}
if a.Character < b.Character {
return -1
}
if a.Character > b.Character {
return 1
}
return 0
}
func (r Range) Format(f fmt.State, _ rune) {
fmt.Fprintf(f, "%v:%v-%v:%v", r.Start.Line, r.Start.Character, r.End.Line, r.End.Character)
}