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package scala
package reflect
package api

/**
 * EXPERIMENTAL
 *
 * This trait provides support for scopes in the reflection API.
 *
 * A scope object generally maps names to symbols available in a corresponding lexical scope.
 * Scopes can be nested. The base type exposed to the reflection API, however,
 * only exposes a minimal interface, representing a scope as an iterable of symbols.
 *
 * For rare occasions when it is necessary to create a scope manually,
 * e.g., to populate members of [[scala.reflect.api.Types#RefinedType]],
 * there is the `newScopeWith` function.
 *
 * Additional functionality is exposed in member scopes that are returned by
 * `members` and `decls` defined in [[scala.reflect.api.Types#TypeApi]].
 * Such scopes support the `sorted` method, which sorts members in declaration order.
 *
 * @group ReflectionAPI
 */
trait Scopes { self: Universe =>

  /** The base type of all scopes.
   *  @template
   *  @group Scopes
   */
  type Scope >: Null <: AnyRef with ScopeApi

  /** The API that all scopes support
   *  @group API
   */
  trait ScopeApi extends Iterable[Symbol]

  /** The type of member scopes, as in class definitions, for example.
   *  @template
   *  @group Scopes
   */
  type MemberScope >: Null <: AnyRef with MemberScopeApi with Scope

  /** The API that all member scopes support
   *  @group API
   */
  trait MemberScopeApi extends ScopeApi {
    /** Sorts the symbols included in this scope so that:
     *    1) Symbols appear in the linearization order of their owners.
     *    2) Symbols with the same owner appear in same order of their declarations.
     *    3) Synthetic members (e.g. getters/setters for vals/vars) might appear in arbitrary order.
     */
    def sorted: List[Symbol]
  }
}