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36d0a50427
This is part of a general effort to move all of Terraform's non-library package surface under internal in order to reinforce that these are for internal use within Terraform only. If you were previously importing packages under this prefix into an external codebase, you could pin to an earlier release tag as an interim solution until you've make a plan to achieve the same functionality some other way.
45 lines
1.1 KiB
Go
45 lines
1.1 KiB
Go
package terraform
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import (
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"fmt"
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"github.com/hashicorp/terraform/internal/dag"
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)
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// VertexTransformer is a GraphTransformer that transforms vertices
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// using the GraphVertexTransformers. The Transforms are run in sequential
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// order. If a transform replaces a vertex then the next transform will see
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// the new vertex.
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type VertexTransformer struct {
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Transforms []GraphVertexTransformer
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}
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func (t *VertexTransformer) Transform(g *Graph) error {
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for _, v := range g.Vertices() {
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for _, vt := range t.Transforms {
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newV, err := vt.Transform(v)
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if err != nil {
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return err
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}
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// If the vertex didn't change, then don't do anything more
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if newV == v {
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continue
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}
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// Vertex changed, replace it within the graph
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if ok := g.Replace(v, newV); !ok {
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// This should never happen, big problem
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return fmt.Errorf(
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"failed to replace %s with %s!\n\nSource: %#v\n\nTarget: %#v",
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dag.VertexName(v), dag.VertexName(newV), v, newV)
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}
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// Replace v so that future transforms use the proper vertex
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v = newV
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}
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}
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return nil
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}
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