vendor/github.com/hashicorp/hil/transform_fixed.go

   1 package hil
   2
   3 import (
   4         "github.com/hashicorp/hil/ast"
   5 )
   6
   7 // FixedValueTransform transforms an AST to return a fixed value for
   8 // all interpolations. i.e. you can make "hi ${anything}" always
   9 // turn into "hi foo".
  10 //
  11 // The primary use case for this is for config validations where you can
  12 // verify that interpolations result in a certain type of string.
  13 func FixedValueTransform(root ast.Node, Value *ast.LiteralNode) ast.Node {
  14         // We visit the nodes in top-down order
  15         result := root
  16         switch n := result.(type) {
  17         case *ast.Output:
  18                 for i, v := range n.Exprs {
  19                         n.Exprs[i] = FixedValueTransform(v, Value)
  20                 }
  21         case *ast.LiteralNode:
  22                 // We keep it as-is
  23         default:
  24                 // Anything else we replace
  25                 result = Value
  26         }
  27
  28         return result
  29 }