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multiplication.go
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multiplication.go
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package dynaml
import (
"fmt"
"net"
)
type MultiplicationExpr struct {
A Expression
B Expression
}
func (e MultiplicationExpr) 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 multiplication must be CIDR or number: %s", err)
}
ones, _ := cidr.Mask.Size()
size := int64(1 << (32 - uint32(ones)))
bint, ok := b.(int64)
if !ok {
return info.Error("CIDR multiplication requires an integer argument")
}
ip = IPAdd(ip.Mask(cidr.Mask), size*bint)
return (&net.IPNet{ip, cidr.Mask}).String(), info, true
}
a, b, err := NumberOperands(a, b)
if err != nil {
return info.Error("non-CIDR multiplication requires number arguments")
}
if _, ok := a.(int64); ok {
return a.(int64) * b.(int64), info, true
}
return a.(float64) * b.(float64), info, true
}
func (e MultiplicationExpr) String() string {
return fmt.Sprintf("%s * %s", e.A, e.B)
}