package dynblock
import (
"github.com/hashicorp/hcl2/hcl"
"github.com/zclconf/go-cty/cty"
)
// unknownBody is a funny body that just reports everything inside it as
// unknown. It uses a given other body as a sort of template for what attributes
// and blocks are inside -- including source location information -- but
// subsitutes unknown values of unknown type for all attributes.
//
// This rather odd process is used to handle expansion of dynamic blocks whose
// for_each expression is unknown. Since a block cannot itself be unknown,
// we instead arrange for everything _inside_ the block to be unknown instead,
// to give the best possible approximation.
type unknownBody struct {
template hcl.Body
}
var _ hcl.Body = unknownBody{}
func (b unknownBody) Content(schema *hcl.BodySchema) (*hcl.BodyContent, hcl.Diagnostics) {
content, diags := b.template.Content(schema)
content = b.fixupContent(content)
// We're intentionally preserving the diagnostics reported from the
// inner body so that we can still report where the template body doesn't
// match the requested schema.
return content, diags
}
func (b unknownBody) PartialContent(schema *hcl.BodySchema) (*hcl.BodyContent, hcl.Body, hcl.Diagnostics) {
content, remain, diags := b.template.PartialContent(schema)
content = b.fixupContent(content)
remain = unknownBody{remain} // remaining content must also be wrapped
// We're intentionally preserving the diagnostics reported from the
// inner body so that we can still report where the template body doesn't
// match the requested schema.
return content, remain, diags
}
func (b unknownBody) JustAttributes() (hcl.Attributes, hcl.Diagnostics) {
attrs, diags := b.template.JustAttributes()
attrs = b.fixupAttrs(attrs)
// We're intentionally preserving the diagnostics reported from the
// inner body so that we can still report where the template body doesn't
// match the requested schema.
return attrs, diags
}
func (b unknownBody) MissingItemRange() hcl.Range {
return b.template.MissingItemRange()
}
func (b unknownBody) fixupContent(got *hcl.BodyContent) *hcl.BodyContent {
ret := &hcl.BodyContent{}
ret.Attributes = b.fixupAttrs(got.Attributes)
if len(got.Blocks) > 0 {
ret.Blocks = make(hcl.Blocks, 0, len(got.Blocks))
for _, gotBlock := range got.Blocks {
new := *gotBlock // shallow copy
new.Body = unknownBody{gotBlock.Body} // nested content must also be marked unknown
ret.Blocks = append(ret.Blocks, &new)
}
}
return ret
}
func (b unknownBody) fixupAttrs(got hcl.Attributes) hcl.Attributes {
if len(got) == 0 {
return nil
}
ret := make(hcl.Attributes, len(got))
for name, gotAttr := range got {
new := *gotAttr // shallow copy
new.Expr = hcl.StaticExpr(cty.DynamicVal, gotAttr.Expr.Range())
ret[name] = &new
}
return ret
}
