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package hil
import (
"github.com/hashicorp/hil/ast"
)
// FixedValueTransform transforms an AST to return a fixed value for
// all interpolations. i.e. you can make "hi ${anything}" always
// turn into "hi foo".
//
// The primary use case for this is for config validations where you can
// verify that interpolations result in a certain type of string.
func FixedValueTransform(root ast.Node, Value *ast.LiteralNode) ast.Node {
// We visit the nodes in top-down order
result := root
switch n := result.(type) {
case *ast.Output:
for i, v := range n.Exprs {
n.Exprs[i] = FixedValueTransform(v, Value)
}
case *ast.LiteralNode:
// We keep it as-is
default:
// Anything else we replace
result = Value
}
return result
}
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