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subtraction.go
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subtraction.go
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package dynaml
import (
"fmt"
"net"
)
type SubtractionExpr struct {
A Expression
B Expression
}
func (e SubtractionExpr) 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 {
var cidr *net.IPNet
var err error
ip := net.ParseIP(str)
if ip == nil {
ip, cidr, err = net.ParseCIDR(str)
if err != nil {
return info.Error("first argument for substraction must be IP address, CIDR or number")
}
}
bint, bok := b.(int64)
if bok {
ip = IPAdd(ip, -bint)
if cidr != nil {
if !cidr.Contains(ip) {
return info.Error("resulting ip address not in CIDR range")
}
cidr.IP = ip
return cidr.String(), info, true
}
return ip.String(), info, true
}
bstr, ok := b.(string)
if ok {
ipb := net.ParseIP(bstr)
if ipb == nil {
ip, _, err := net.ParseCIDR(bstr)
if err != nil {
return info.Error("second argument for substraction must be IP address, CIDR or number")
}
ipb = ip
}
if len(ip) != len(ipb) {
return info.Error("IP type mismatch (%d != %d)", len(ip), len(ipb))
}
return DiffIP(ip, ipb), info, true
}
return info.Error("second argument of IP address subtraction must be IP address or integer")
}
a, b, err := NumberOperands(a, b)
if err != nil {
return info.Error("non-IP address subtration requires number arguments")
}
if _, ok := a.(int64); ok {
return a.(int64) - b.(int64), info, true
}
return a.(float64) - b.(float64), info, true
}
func (e SubtractionExpr) String() string {
return fmt.Sprintf("%s - %s", e.A, e.B)
}