github.com/paybyphone/terraform@v0.9.5-0.20170613192930-9706042ddd51/terraform/transform_variable.go (about)

     1  package terraform
     2  
     3  import (
     4  	"github.com/hashicorp/terraform/config/module"
     5  )
     6  
     7  // RootVariableTransformer is a GraphTransformer that adds all the root
     8  // variables to the graph.
     9  //
    10  // Root variables are currently no-ops but they must be added to the
    11  // graph since downstream things that depend on them must be able to
    12  // reach them.
    13  type RootVariableTransformer struct {
    14  	Module *module.Tree
    15  }
    16  
    17  func (t *RootVariableTransformer) Transform(g *Graph) error {
    18  	// If no config, no variables
    19  	if t.Module == nil {
    20  		return nil
    21  	}
    22  
    23  	// If we have no vars, we're done!
    24  	vars := t.Module.Config().Variables
    25  	if len(vars) == 0 {
    26  		return nil
    27  	}
    28  
    29  	// Add all variables here
    30  	for _, v := range vars {
    31  		node := &NodeRootVariable{
    32  			Config: v,
    33  		}
    34  
    35  		// Add it!
    36  		g.Add(node)
    37  	}
    38  
    39  	return nil
    40  }