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// Copyright (c) HashiCorp, Inc.
// SPDX-License-Identifier: MPL-2.0
package transform
import (
"github.com/hashicorp/hcl/v2"
)
// A Transformer takes a given body, applies some (possibly no-op)
// transform to it, and returns the new body.
//
// It must _not_ mutate the given body in-place.
//
// The transform call cannot fail, but it _can_ return a body that immediately
// returns diagnostics when its methods are called. NewErrorBody is a utility
// to help with this.
type Transformer interface {
TransformBody(hcl.Body) hcl.Body
}
// TransformerFunc is a function type that implements Transformer.
type TransformerFunc func(hcl.Body) hcl.Body
// TransformBody is an implementation of Transformer.TransformBody.
func (f TransformerFunc) TransformBody(in hcl.Body) hcl.Body {
return f(in)
}
type chain []Transformer
// Chain takes a slice of transformers and returns a single new
// Transformer that applies each of the given transformers in sequence.
func Chain(c []Transformer) Transformer {
return chain(c)
}
func (c chain) TransformBody(body hcl.Body) hcl.Body {
for _, t := range c {
body = t.TransformBody(body)
}
return body
}
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