forked from ent/contrib
-
Notifications
You must be signed in to change notification settings - Fork 0
/
bigint.go
79 lines (69 loc) · 1.71 KB
/
bigint.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
// Copyright 2019-present Facebook
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package bigintgql
import (
"database/sql"
"database/sql/driver"
"fmt"
"io"
"math/big"
"strconv"
"strings"
)
type BigInt struct {
*big.Int
}
func NewBigInt(i int64) BigInt {
return BigInt{Int: big.NewInt(i)}
}
func (b *BigInt) Scan(src interface{}) error {
var i sql.NullString
if err := i.Scan(src); err != nil {
return err
}
if !i.Valid {
return nil
}
if b.Int == nil {
b.Int = big.NewInt(0)
}
// Value came in a floating point format.
if strings.ContainsAny(i.String, ".+e") {
f := big.NewFloat(0)
if _, err := fmt.Sscan(i.String, f); err != nil {
return err
}
b.Int, _ = f.Int(b.Int)
} else if _, err := fmt.Sscan(i.String, b.Int); err != nil {
return err
}
return nil
}
func (b BigInt) Value() (driver.Value, error) {
return b.String(), nil
}
func (b BigInt) MarshalGQL(w io.Writer) {
fmt.Fprint(w, strconv.Quote(b.String()))
}
func (b *BigInt) UnmarshalGQL(v interface{}) error {
if bi, ok := v.(string); ok {
b.Int = new(big.Int)
b.Int, ok = b.Int.SetString(bi, 10)
if !ok {
return fmt.Errorf("invalid big number: %s", bi)
}
return nil
}
return fmt.Errorf("invalid big number")
}