vendor/github.com/hashicorp/terraform/config/config_tree.go

   1 package config
   2
   3 // configTree represents a tree of configurations where the root is the
   4 // first file and its children are the configurations it has imported.
   5 type configTree struct {
   6         Path     string
   7         Config   *Config
   8         Children []*configTree
   9 }
  10
  11 // Flatten flattens the entire tree down to a single merged Config
  12 // structure.
  13 func (t *configTree) Flatten() (*Config, error) {
  14         // No children is easy: we're already merged!
  15         if len(t.Children) == 0 {
  16                 return t.Config, nil
  17         }
  18
  19         // Depth-first, merge all the children first.
  20         childConfigs := make([]*Config, len(t.Children))
  21         for i, ct := range t.Children {
  22                 c, err := ct.Flatten()
  23                 if err != nil {
  24                         return nil, err
  25                 }
  26
  27                 childConfigs[i] = c
  28         }
  29
  30         // Merge all the children in order
  31         config := childConfigs[0]
  32         childConfigs = childConfigs[1:]
  33         for _, config2 := range childConfigs {
  34                 var err error
  35                 config, err = Merge(config, config2)
  36                 if err != nil {
  37                         return nil, err
  38                 }
  39         }
  40
  41         // Merge the final merged child config with our own
  42         return Merge(config, t.Config)
  43 }