1 package pgtype
2
3 import (
4 "bytes"
5 "database/sql/driver"
6 "encoding/binary"
7 "fmt"
8 "math"
9 "strconv"
10 "strings"
11
12 "github.com/jackc/pgio"
13 )
14
15 type Vec2 struct {
16 X float64
17 Y float64
18 }
19
20 type Point struct {
21 P Vec2
22 Status Status
23 }
24
25 func (dst *Point) Set(src interface{}) error {
26 if src == nil {
27 dst.Status = Null
28 return nil
29 }
30 err := fmt.Errorf("cannot convert %v to Point", src)
31 var p *Point
32 switch value := src.(type) {
33 case string:
34 p, err = parsePoint([]byte(value))
35 case []byte:
36 p, err = parsePoint(value)
37 default:
38 return err
39 }
40 if err != nil {
41 return err
42 }
43 *dst = *p
44 return nil
45 }
46
47 func parsePoint(src []byte) (*Point, error) {
48 if src == nil || bytes.Compare(src, []byte("null")) == 0 {
49 return &Point{Status: Null}, nil
50 }
51
52 if len(src) < 5 {
53 return nil, fmt.Errorf("invalid length for point: %v", len(src))
54 }
55 if src[0] == '"' && src[len(src)-1] == '"' {
56 src = src[1 : len(src)-1]
57 }
58 parts := strings.SplitN(string(src[1:len(src)-1]), ",", 2)
59 if len(parts) < 2 {
60 return nil, fmt.Errorf("invalid format for point")
61 }
62
63 x, err := strconv.ParseFloat(parts[0], 64)
64 if err != nil {
65 return nil, err
66 }
67
68 y, err := strconv.ParseFloat(parts[1], 64)
69 if err != nil {
70 return nil, err
71 }
72
73 return &Point{P: Vec2{x, y}, Status: Present}, nil
74 }
75
76 func (dst Point) Get() interface{} {
77 switch dst.Status {
78 case Present:
79 return dst
80 case Null:
81 return nil
82 default:
83 return dst.Status
84 }
85 }
86
87 func (src *Point) AssignTo(dst interface{}) error {
88 return fmt.Errorf("cannot assign %v to %T", src, dst)
89 }
90
91 func (dst *Point) DecodeText(ci *ConnInfo, src []byte) error {
92 if src == nil {
93 *dst = Point{Status: Null}
94 return nil
95 }
96
97 if len(src) < 5 {
98 return fmt.Errorf("invalid length for point: %v", len(src))
99 }
100
101 parts := strings.SplitN(string(src[1:len(src)-1]), ",", 2)
102 if len(parts) < 2 {
103 return fmt.Errorf("invalid format for point")
104 }
105
106 x, err := strconv.ParseFloat(parts[0], 64)
107 if err != nil {
108 return err
109 }
110
111 y, err := strconv.ParseFloat(parts[1], 64)
112 if err != nil {
113 return err
114 }
115
116 *dst = Point{P: Vec2{x, y}, Status: Present}
117 return nil
118 }
119
120 func (dst *Point) DecodeBinary(ci *ConnInfo, src []byte) error {
121 if src == nil {
122 *dst = Point{Status: Null}
123 return nil
124 }
125
126 if len(src) != 16 {
127 return fmt.Errorf("invalid length for point: %v", len(src))
128 }
129
130 x := binary.BigEndian.Uint64(src)
131 y := binary.BigEndian.Uint64(src[8:])
132
133 *dst = Point{
134 P: Vec2{math.Float64frombits(x), math.Float64frombits(y)},
135 Status: Present,
136 }
137 return nil
138 }
139
140 func (src Point) EncodeText(ci *ConnInfo, buf []byte) ([]byte, error) {
141 switch src.Status {
142 case Null:
143 return nil, nil
144 case Undefined:
145 return nil, errUndefined
146 }
147
148 return append(buf, fmt.Sprintf(`(%s,%s)`,
149 strconv.FormatFloat(src.P.X, 'f', -1, 64),
150 strconv.FormatFloat(src.P.Y, 'f', -1, 64),
151 )...), nil
152 }
153
154 func (src Point) EncodeBinary(ci *ConnInfo, buf []byte) ([]byte, error) {
155 switch src.Status {
156 case Null:
157 return nil, nil
158 case Undefined:
159 return nil, errUndefined
160 }
161
162 buf = pgio.AppendUint64(buf, math.Float64bits(src.P.X))
163 buf = pgio.AppendUint64(buf, math.Float64bits(src.P.Y))
164 return buf, nil
165 }
166
167
168 func (dst *Point) Scan(src interface{}) error {
169 if src == nil {
170 *dst = Point{Status: Null}
171 return nil
172 }
173
174 switch src := src.(type) {
175 case string:
176 return dst.DecodeText(nil, []byte(src))
177 case []byte:
178 srcCopy := make([]byte, len(src))
179 copy(srcCopy, src)
180 return dst.DecodeText(nil, srcCopy)
181 }
182
183 return fmt.Errorf("cannot scan %T", src)
184 }
185
186
187 func (src Point) Value() (driver.Value, error) {
188 return EncodeValueText(src)
189 }
190
191 func (src Point) MarshalJSON() ([]byte, error) {
192 switch src.Status {
193 case Present:
194 var buff bytes.Buffer
195 buff.WriteByte('"')
196 buff.WriteString(fmt.Sprintf("(%g,%g)", src.P.X, src.P.Y))
197 buff.WriteByte('"')
198 return buff.Bytes(), nil
199 case Null:
200 return []byte("null"), nil
201 case Undefined:
202 return nil, errUndefined
203 }
204 return nil, errBadStatus
205 }
206
207 func (dst *Point) UnmarshalJSON(point []byte) error {
208 p, err := parsePoint(point)
209 if err != nil {
210 return err
211 }
212 *dst = *p
213 return nil
214 }
215
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