adding positioning support

rule/position.go

@@ -0,0 +1,70 @@
+package rule
+
+import (
+	"fmt"
+
+	"github.com/PaloAltoNetworks/pango/errors"
+)
+
+type Position struct {
+	First           *bool   `json:"first,omitempty"`
+	Last            *bool   `json:"last,omitempty"`
+	SomewhereBefore *string `json:"somewhere_before,omitempty"`
+	DirectlyBefore  *string `json:"directly_before,omitempty"`
+	SomewhereAfter  *string `json:"somewhere_after,omitempty"`
+	DirectlyAfter   *string `json:"directly_after,omitempty"`
+}
+
+func (o *Position) IsValid(removeEverythingElse bool) error {
+	count := 0
+
+	if o.First != nil && *o.First {
+		count++
+	}
+
+	if o.Last != nil && *o.Last {
+		count++
+	}
+
+	if o.SomewhereBefore != nil {
+		if removeEverythingElse {
+			return errors.RelativePositionWithRemoveEverythingElseError
+		}
+		if *o.SomewhereBefore != "" {
+			count++
+		}
+	}
+
+	if o.DirectlyBefore != nil {
+		if removeEverythingElse {
+			return errors.RelativePositionWithRemoveEverythingElseError
+		}
+		if *o.DirectlyBefore != "" {
+			count++
+		}
+	}
+
+	if o.SomewhereAfter != nil {
+		if removeEverythingElse {
+			return errors.RelativePositionWithRemoveEverythingElseError
+		}
+		if *o.SomewhereAfter != "" {
+			count++
+		}
+	}
+
+	if o.DirectlyAfter != nil {
+		if removeEverythingElse {
+			return errors.RelativePositionWithRemoveEverythingElseError
+		}
+		if *o.DirectlyAfter != "" {
+			count++
+		}
+	}
+
+	if count > 1 {
+		return fmt.Errorf("multiple positions specified: only one should be specified")
+	}
+
+	return nil
+}