-
Notifications
You must be signed in to change notification settings - Fork 0
/
path.go
196 lines (160 loc) · 3.6 KB
/
path.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
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
package pgtype
import (
"database/sql/driver"
"encoding/binary"
"fmt"
"math"
"strconv"
"strings"
"github.com/jackc/pgx/pgio"
"github.com/pkg/errors"
)
type Path struct {
P []Vec2
Closed bool
Status Status
}
func (dst *Path) Set(src interface{}) error {
return errors.Errorf("cannot convert %v to Path", src)
}
func (dst *Path) Get() interface{} {
switch dst.Status {
case Present:
return dst
case Null:
return nil
default:
return dst.Status
}
}
func (src *Path) AssignTo(dst interface{}) error {
return errors.Errorf("cannot assign %v to %T", src, dst)
}
func (dst *Path) DecodeText(ci *ConnInfo, src []byte) error {
if src == nil {
*dst = Path{Status: Null}
return nil
}
if len(src) < 7 {
return errors.Errorf("invalid length for Path: %v", len(src))
}
closed := src[0] == '('
points := make([]Vec2, 0)
str := string(src[2:])
for {
end := strings.IndexByte(str, ',')
x, err := strconv.ParseFloat(str[:end], 64)
if err != nil {
return err
}
str = str[end+1:]
end = strings.IndexByte(str, ')')
y, err := strconv.ParseFloat(str[:end], 64)
if err != nil {
return err
}
points = append(points, Vec2{x, y})
if end+3 < len(str) {
str = str[end+3:]
} else {
break
}
}
*dst = Path{P: points, Closed: closed, Status: Present}
return nil
}
func (dst *Path) DecodeBinary(ci *ConnInfo, src []byte) error {
if src == nil {
*dst = Path{Status: Null}
return nil
}
if len(src) < 5 {
return errors.Errorf("invalid length for Path: %v", len(src))
}
closed := src[0] == 1
pointCount := int(binary.BigEndian.Uint32(src[1:]))
rp := 5
if 5+pointCount*16 != len(src) {
return errors.Errorf("invalid length for Path with %d points: %v", pointCount, len(src))
}
points := make([]Vec2, pointCount)
for i := 0; i < len(points); i++ {
x := binary.BigEndian.Uint64(src[rp:])
rp += 8
y := binary.BigEndian.Uint64(src[rp:])
rp += 8
points[i] = Vec2{math.Float64frombits(x), math.Float64frombits(y)}
}
*dst = Path{
P: points,
Closed: closed,
Status: Present,
}
return nil
}
func (src *Path) EncodeText(ci *ConnInfo, buf []byte) ([]byte, error) {
switch src.Status {
case Null:
return nil, nil
case Undefined:
return nil, errUndefined
}
var startByte, endByte byte
if src.Closed {
startByte = '('
endByte = ')'
} else {
startByte = '['
endByte = ']'
}
buf = append(buf, startByte)
for i, p := range src.P {
if i > 0 {
buf = append(buf, ',')
}
buf = append(buf, fmt.Sprintf(`(%s,%s)`,
strconv.FormatFloat(p.X, 'f', -1, 64),
strconv.FormatFloat(p.Y, 'f', -1, 64),
)...)
}
return append(buf, endByte), nil
}
func (src *Path) EncodeBinary(ci *ConnInfo, buf []byte) ([]byte, error) {
switch src.Status {
case Null:
return nil, nil
case Undefined:
return nil, errUndefined
}
var closeByte byte
if src.Closed {
closeByte = 1
}
buf = append(buf, closeByte)
buf = pgio.AppendInt32(buf, int32(len(src.P)))
for _, p := range src.P {
buf = pgio.AppendUint64(buf, math.Float64bits(p.X))
buf = pgio.AppendUint64(buf, math.Float64bits(p.Y))
}
return buf, nil
}
// Scan implements the database/sql Scanner interface.
func (dst *Path) Scan(src interface{}) error {
if src == nil {
*dst = Path{Status: Null}
return nil
}
switch src := src.(type) {
case string:
return dst.DecodeText(nil, []byte(src))
case []byte:
srcCopy := make([]byte, len(src))
copy(srcCopy, src)
return dst.DecodeText(nil, srcCopy)
}
return errors.Errorf("cannot scan %T", src)
}
// Value implements the database/sql/driver Valuer interface.
func (src *Path) Value() (driver.Value, error) {
return EncodeValueText(src)
}