Implement canonical projection and detached copies

schema.go

@@ -28,7 +28,8 @@ const (
 )
 
 type schemaDescriptor struct {
-	root *typeDescriptor
+	root  *typeDescriptor
+	types map[reflect.Type]*typeDescriptor
 }
 
 type typeDescriptor struct {
@@ -36,11 +37,19 @@ type typeDescriptor struct {
 	kind        descriptorKind
 	element     *typeDescriptor
 	length      int
+	members     []structMember
 	fields      []fieldDescriptor
 	fieldByName map[string]int
 	inlineMap   *fieldDescriptor
 }
 
+type structMember struct {
+	index      int
+	name       string
+	descriptor *typeDescriptor
+	inline     bool
+}
+
 type fieldDescriptor struct {
 	name       string
 	index      []int
@@ -76,7 +85,7 @@ func buildSchema(root reflect.Type) (*schemaDescriptor, *schemaIssue) {
 	if descriptor.kind != descriptorStruct && descriptor.kind != descriptorMap {
 		return nil, &schemaIssue{code: CodeSchemaRoot, message: "configuration root must be a structural struct or string-keyed map"}
 	}
-	return &schemaDescriptor{root: descriptor}, nil
+	return &schemaDescriptor{root: descriptor, types: builder.cache}, nil
 }
 
 type schemaBuilder struct {
@@ -228,6 +237,11 @@ func (b *schemaBuilder) describeFields(descriptor *typeDescriptor, current refle
 					}
 					descriptor.inlineMap = &nested
 				}
+				memberType, memberIssue := b.describe(field.Type, path)
+				if memberIssue != nil {
+					return memberIssue
+				}
+				descriptor.members = append(descriptor.members, structMember{index: i, descriptor: memberType, inline: true})
 			case reflect.Map:
 				if inlineType.Key().Kind() != reflect.String {
 					return &schemaIssue{code: CodeSchemaInline, path: path.clone(), message: "inline map must have string keys"}
@@ -241,6 +255,7 @@ func (b *schemaBuilder) describeFields(descriptor *typeDescriptor, current refle
 					return childIssue
 				}
 				descriptor.inlineMap = &fieldDescriptor{index: []int{i}, descriptor: fieldType, secret: secret, inlineMap: true}
+				descriptor.members = append(descriptor.members, structMember{index: i, descriptor: fieldType, inline: true})
 			default:
 				return &schemaIssue{code: CodeSchemaInline, path: path.clone(), message: "inline field must be a struct, pointer to struct, or string-keyed map"}
 			}
@@ -255,6 +270,7 @@ func (b *schemaBuilder) describeFields(descriptor *typeDescriptor, current refle
 		if issue := addField(descriptor, fieldDescriptor{name: name, index: []int{i}, descriptor: fieldType, secret: secret}, path); issue != nil {
 			return issue
 		}
+		descriptor.members = append(descriptor.members, structMember{index: i, name: name, descriptor: fieldType})
 	}
 	return nil
 }