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package terraform
// EvalNodeOpFilterable is an interface that EvalNodes can implement
// to be filterable by the operation that is being run on Terraform.
type EvalNodeOpFilterable interface {
IncludeInOp(walkOperation) bool
}
// EvalNodeFilterOp returns a filter function that filters nodes that
// include themselves in specific operations.
func EvalNodeFilterOp(op walkOperation) EvalNodeFilterFunc {
return func(n EvalNode) EvalNode {
include := true
if of, ok := n.(EvalNodeOpFilterable); ok {
include = of.IncludeInOp(op)
}
if include {
return n
}
return EvalNoop{}
}
}
// EvalOpFilter is an EvalNode implementation that is a proxy to
// another node but filters based on the operation.
type EvalOpFilter struct {
// Ops is the list of operations to include this node in.
Ops []walkOperation
// Node is the node to execute
Node EvalNode
}
// TODO: test
func (n *EvalOpFilter) Eval(ctx EvalContext) (interface{}, error) {
return EvalRaw(n.Node, ctx)
}
// EvalNodeOpFilterable impl.
func (n *EvalOpFilter) IncludeInOp(op walkOperation) bool {
for _, v := range n.Ops {
if v == op {
return true
}
}
return false
}
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