84 lines
2.8 KiB
Go
84 lines
2.8 KiB
Go
package transform
|
|
|
|
import (
|
|
"github.com/hashicorp/hcl/v2"
|
|
)
|
|
|
|
// Shallow is equivalent to calling transformer.TransformBody(body), and
|
|
// is provided only for completeness of the top-level API.
|
|
func Shallow(body hcl.Body, transformer Transformer) hcl.Body {
|
|
return transformer.TransformBody(body)
|
|
}
|
|
|
|
// Deep applies the given transform to the given body and then
|
|
// wraps the result such that any descendent blocks that are decoded will
|
|
// also have the transform applied to their bodies.
|
|
//
|
|
// This allows for language extensions that define a particular block type
|
|
// for a particular body and all nested blocks within it.
|
|
//
|
|
// Due to the wrapping behavior, the body resulting from this function
|
|
// will not be of the type returned by the transformer. Callers may call
|
|
// only the methods defined for interface hcl.Body, and may not type-assert
|
|
// to access other methods.
|
|
func Deep(body hcl.Body, transformer Transformer) hcl.Body {
|
|
return deepWrapper{
|
|
Transformed: transformer.TransformBody(body),
|
|
Transformer: transformer,
|
|
}
|
|
}
|
|
|
|
// deepWrapper is a hcl.Body implementation that ensures that a given
|
|
// transformer is applied to another given body when content is extracted,
|
|
// and that it recursively applies to any child blocks that are extracted.
|
|
type deepWrapper struct {
|
|
Transformed hcl.Body
|
|
Transformer Transformer
|
|
}
|
|
|
|
func (w deepWrapper) Content(schema *hcl.BodySchema) (*hcl.BodyContent, hcl.Diagnostics) {
|
|
content, diags := w.Transformed.Content(schema)
|
|
content = w.transformContent(content)
|
|
return content, diags
|
|
}
|
|
|
|
func (w deepWrapper) PartialContent(schema *hcl.BodySchema) (*hcl.BodyContent, hcl.Body, hcl.Diagnostics) {
|
|
content, remain, diags := w.Transformed.PartialContent(schema)
|
|
content = w.transformContent(content)
|
|
return content, remain, diags
|
|
}
|
|
|
|
func (w deepWrapper) transformContent(content *hcl.BodyContent) *hcl.BodyContent {
|
|
if len(content.Blocks) == 0 {
|
|
// Easy path: if there are no blocks then there are no child bodies to wrap
|
|
return content
|
|
}
|
|
|
|
// Since we're going to change things here, we'll be polite and clone the
|
|
// structure so that we don't risk impacting any internal state of the
|
|
// original body.
|
|
ret := &hcl.BodyContent{
|
|
Attributes: content.Attributes,
|
|
MissingItemRange: content.MissingItemRange,
|
|
Blocks: make(hcl.Blocks, len(content.Blocks)),
|
|
}
|
|
|
|
for i, givenBlock := range content.Blocks {
|
|
// Shallow-copy the block so we can mutate it
|
|
newBlock := *givenBlock
|
|
newBlock.Body = Deep(newBlock.Body, w.Transformer)
|
|
ret.Blocks[i] = &newBlock
|
|
}
|
|
|
|
return ret
|
|
}
|
|
|
|
func (w deepWrapper) JustAttributes() (hcl.Attributes, hcl.Diagnostics) {
|
|
// Attributes can't have bodies or nested blocks, so this is just a thin wrapper.
|
|
return w.Transformed.JustAttributes()
|
|
}
|
|
|
|
func (w deepWrapper) MissingItemRange() hcl.Range {
|
|
return w.Transformed.MissingItemRange()
|
|
}
|