vendor/github.com/hashicorp/terraform/lang/blocktoattr/variables.go

   1 package blocktoattr
   2
   3 import (
   4         "github.com/hashicorp/hcl2/ext/dynblock"
   5         "github.com/hashicorp/hcl2/hcl"
   6         "github.com/hashicorp/hcl2/hcldec"
   7         "github.com/hashicorp/terraform/configs/configschema"
   8 )
   9
  10 // ExpandedVariables finds all of the global variables referenced in the
  11 // given body with the given schema while taking into account the possibilities
  12 // both of "dynamic" blocks being expanded and the possibility of certain
  13 // attributes being written instead as nested blocks as allowed by the
  14 // FixUpBlockAttrs function.
  15 //
  16 // This function exists to allow variables to be analyzed prior to dynamic
  17 // block expansion while also dealing with the fact that dynamic block expansion
  18 // might in turn produce nested blocks that are subject to FixUpBlockAttrs.
  19 //
  20 // This is intended as a drop-in replacement for dynblock.VariablesHCLDec,
  21 // which is itself a drop-in replacement for hcldec.Variables.
  22 func ExpandedVariables(body hcl.Body, schema *configschema.Block) []hcl.Traversal {
  23         rootNode := dynblock.WalkVariables(body)
  24         return walkVariables(rootNode, body, schema)
  25 }
  26
  27 func walkVariables(node dynblock.WalkVariablesNode, body hcl.Body, schema *configschema.Block) []hcl.Traversal {
  28         givenRawSchema := hcldec.ImpliedSchema(schema.DecoderSpec())
  29         ambiguousNames := ambiguousNames(schema)
  30         effectiveRawSchema := effectiveSchema(givenRawSchema, body, ambiguousNames, false)
  31         vars, children := node.Visit(effectiveRawSchema)
  32
  33         for _, child := range children {
  34                 if blockS, exists := schema.BlockTypes[child.BlockTypeName]; exists {
  35                         vars = append(vars, walkVariables(child.Node, child.Body(), &blockS.Block)...)
  36                 } else if attrS, exists := schema.Attributes[child.BlockTypeName]; exists {
  37                         synthSchema := SchemaForCtyElementType(attrS.Type.ElementType())
  38                         vars = append(vars, walkVariables(child.Node, child.Body(), synthSchema)...)
  39                 }
  40         }
  41
  42         return vars
  43 }