-
Notifications
You must be signed in to change notification settings - Fork 16
/
division.go
82 lines (71 loc) · 1.68 KB
/
division.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
package dynaml
import (
"fmt"
"net"
)
type DivisionExpr struct {
A Expression
B Expression
}
func (e DivisionExpr) Evaluate(binding Binding, locally bool) (interface{}, EvaluationInfo, bool) {
resolved := true
a, info, ok := ResolveExpressionOrPushEvaluation(&e.A, &resolved, nil, binding, false)
if !ok {
return nil, info, false
}
b, info, ok := ResolveExpressionOrPushEvaluation(&e.B, &resolved, &info, binding, false)
if !ok {
return nil, info, false
}
if !resolved {
return e, info, true
}
str, ok := a.(string)
if ok {
ip, cidr, err := net.ParseCIDR(str)
if err != nil {
return info.Error("first argument of division must be CIDR or number: %s", err)
}
ones, bits := cidr.Mask.Size()
ip = ip.Mask(cidr.Mask)
round := false
bint, ok := b.(int64)
if !ok {
return info.Error("IP address division requires an integer argument")
}
if bint < 1 {
return info.Error("IP address division requires a positive integer argument")
}
for bint > 1 {
if bint%2 == 1 {
round = true
}
bint = bint / 2
ones++
}
if round {
ones++
}
if ones > 32 {
return info.Error("divisor too large for CIDR network size")
}
return (&net.IPNet{ip, net.CIDRMask(ones, bits)}).String(), info, true
}
a, b, err := NumberOperands(a, b)
if err != nil {
return info.Error("non-CIDR division requires number arguments")
}
if ib, ok := b.(int64); ok {
if ib == 0 {
return info.Error("division by zero")
}
return a.(int64) / ib, info, true
}
if b.(float64) == 0.0 {
return info.Error("division by zero")
}
return a.(float64) / b.(float64), info, true
}
func (e DivisionExpr) String() string {
return fmt.Sprintf("%s / %s", e.A, e.B)
}