MCFullGenericTypes.mc4

/* (c) https://github.com/MontiCore/monticore */
package de.monticore.types;

/* This is a MontiCore stable grammar.
 * Adaptations -- if any -- are conservative. */

import de.monticore.types.*;

/**
 * This grammar completes the type definitions to 
 * support the full Java type system including wildcards Blubb<? extends A>
 *
 * A general advice: When you are not sure that you need this kind of
 * types, then use a simpler version.
 * Type checking ist tricky.
 * 
 * This grammar is part of a hierarchy of types, namely 
 * * types.MCBasicTypes.mc4       
 *   * types/MCArrayTypes.mc4
 *   * types/MCCollectionTypes.mc4  
 *     * types/MCSimpleGenericTypes.mc4
 *       * types/MCFullGenericTypes.mc4    
 *
*/

component grammar MCFullGenericTypes
          extends MCSimpleGenericTypes {

  /*=================================================================*/

  /** ASTWildcardTypeArgument represents a wildcard type in a type argument
  *   (generics). It also contains either an upper- or a lower bound.
  *
  *   @attribute upperBound Supertye of the type argument
  *   @attribute lowerBound Subtype of the type argument
  */
  MCWildcardTypeArgument implements MCTypeArgument =
       "?" (  ("extends" upperBound:MCType) 
            | ("super"   lowerBound:MCType) )?;


  /*=================================================================*/

  /** ASTMCMultipleGenericType 
   *  is only used for parsing, if referenced Type is
   *  generic AND has generic inner classes e.g.
   *  monticore.Generic1<TypeParam1>.GenericInnerClass<TypeParam2>
  */
  MCMultipleGenericType implements MCGenericType, MCType =
       MCBasicGenericType  // complex Outer Type qualification
        "."  (MCInnerType || ".")+  ;

  // At this point it is not unique whether a type name is used or defined: 
  // this left open to the embedding nonterminal
  MCInnerType = Name ("<" (MCTypeArgument || ",")+ ">")?;

}