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|
package configschema
import (
"github.com/hashicorp/hcl2/hcldec"
)
var mapLabelNames = []string{"key"}
// DecoderSpec returns a hcldec.Spec that can be used to decode a HCL Body
// using the facilities in the hcldec package.
//
// The returned specification is guaranteed to return a value of the same type
// returned by method ImpliedType, but it may contain null values if any of the
// block attributes are defined as optional and/or computed respectively.
func (b *Block) DecoderSpec() hcldec.Spec {
ret := hcldec.ObjectSpec{}
if b == nil {
return ret
}
for name, attrS := range b.Attributes {
ret[name] = attrS.decoderSpec(name)
}
for name, blockS := range b.BlockTypes {
if _, exists := ret[name]; exists {
// This indicates an invalid schema, since it's not valid to
// define both an attribute and a block type of the same name.
// However, we don't raise this here since it's checked by
// InternalValidate.
continue
}
childSpec := blockS.Block.DecoderSpec()
switch blockS.Nesting {
case NestingSingle, NestingGroup:
ret[name] = &hcldec.BlockSpec{
TypeName: name,
Nested: childSpec,
Required: blockS.MinItems == 1 && blockS.MaxItems >= 1,
}
if blockS.Nesting == NestingGroup {
ret[name] = &hcldec.DefaultSpec{
Primary: ret[name],
Default: &hcldec.LiteralSpec{
Value: blockS.EmptyValue(),
},
}
}
case NestingList:
// We prefer to use a list where possible, since it makes our
// implied type more complete, but if there are any
// dynamically-typed attributes inside we must use a tuple
// instead, at the expense of our type then not being predictable.
if blockS.Block.ImpliedType().HasDynamicTypes() {
ret[name] = &hcldec.BlockTupleSpec{
TypeName: name,
Nested: childSpec,
MinItems: blockS.MinItems,
MaxItems: blockS.MaxItems,
}
} else {
ret[name] = &hcldec.BlockListSpec{
TypeName: name,
Nested: childSpec,
MinItems: blockS.MinItems,
MaxItems: blockS.MaxItems,
}
}
case NestingSet:
// We forbid dynamically-typed attributes inside NestingSet in
// InternalValidate, so we don't do anything special to handle
// that here. (There is no set analog to tuple and object types,
// because cty's set implementation depends on knowing the static
// type in order to properly compute its internal hashes.)
ret[name] = &hcldec.BlockSetSpec{
TypeName: name,
Nested: childSpec,
MinItems: blockS.MinItems,
MaxItems: blockS.MaxItems,
}
case NestingMap:
// We prefer to use a list where possible, since it makes our
// implied type more complete, but if there are any
// dynamically-typed attributes inside we must use a tuple
// instead, at the expense of our type then not being predictable.
if blockS.Block.ImpliedType().HasDynamicTypes() {
ret[name] = &hcldec.BlockObjectSpec{
TypeName: name,
Nested: childSpec,
LabelNames: mapLabelNames,
}
} else {
ret[name] = &hcldec.BlockMapSpec{
TypeName: name,
Nested: childSpec,
LabelNames: mapLabelNames,
}
}
default:
// Invalid nesting type is just ignored. It's checked by
// InternalValidate.
continue
}
}
return ret
}
func (a *Attribute) decoderSpec(name string) hcldec.Spec {
return &hcldec.AttrSpec{
Name: name,
Type: a.Type,
Required: a.Required,
}
}
|
