Nice/src/bossa/syntax niceMethod.nice,1.22,1.23

Update of /cvsroot/nice/Nice/src/bossa/syntax
In directory sc8-pr-cvs1.sourceforge.net:/tmp/cvs-serv23136/src/bossa/syntax

Modified Files:
	niceMethod.nice 
Log Message:
Factored out the specialization predicates. Finally under one pagefull.
Hopefully the logics is clear now.


Index: niceMethod.nice
===================================================================
RCS file: /cvsroot/nice/Nice/src/bossa/syntax/niceMethod.nice,v
retrieving revision 1.22
retrieving revision 1.23
diff -C2 -d -r1.22 -r1.23
*** niceMethod.nice	8 Mar 2005 10:11:09 -0000	1.22
--- niceMethod.nice	8 Mar 2005 10:50:59 -0000	1.23
***************
*** 107,150 ****
          let itsDomain = nice.tools.typing.Types.domain(s.getType());
  
!         // Do we have a smaller domain?
!         if (! (mlsub.typing.Typing.smaller(ourDomain, itsDomain, true))
!             ||  nice.tools.typing.Types.typeParameterDispatch(this.getType(), s.getType()))
            {
!             // If the method is imported,
!             // check if the reverse relation holds with that method
!             if (d.module != null && d.module.compiled() &&
!                 mlsub.typing.Typing.smaller(itsDomain, ourDomain, true) &&
!                 ! nice.tools.typing.Types.typeParameterDispatch(s.getType(), this.getType()))
!               {
!                 if (! nice.tools.typing.Types.covariantSpecialization(s.getType(), this.getType()))
! 		  this.reportReturnTypeError(shouldBeLess: true, than: d);
  
!                 // d is a specialized version of this.
!                 if (d instanceof NiceMethod)
!                   d.addSpecializedMethod(this);
  
!                 // Therefore, all its implementations also belong to this.
!                 addAllAlternatives(d, this);
!               }
  
!             continue;
!           }
  
!         // In a compiled package, we don't need checking.
!         if (! module.compiled())
! 	  if (! this.checkOverride(s, d, ourDomain, itsDomain))
! 	    // Ignore. Errors are reported by checkOverride.
!             continue;
  
!         this.addSpecializedMethod(d);
!       }
  
!     homonyms = null;
    }
  
    private UserError reportReturnTypeError
!     (boolean shouldBeLess, MethodDeclaration than)
    {
!     let message = shouldBeLess ?
  "This return type should be less precise than the return type of method" :
  "This return type is less precise than the original return type of method";
--- 107,163 ----
          let itsDomain = nice.tools.typing.Types.domain(s.getType());
  
! 	if (this.specializes(s, ourDomain, itsDomain))
! 	  {
! 	    // In a compiled package, we don't need checking.
! 	    if (! module.compiled())
! 	      if (! this.checkOverride(s, d, ourDomain, itsDomain))
! 		// Ignore. Errors are reported by checkOverride.
! 		continue;
! 
! 	    this.addSpecializedMethod(d);
! 	  }
! 	else if (this.isSpecializedBy(d, s, ourDomain, itsDomain))
            {
! 	    if (! nice.tools.typing.Types.covariantSpecialization(s.getType(), this.getType()))
! 	      this.reportReturnTypeError(shouldBeLessPrecise: true, than: d);
  
! 	    // d is a specialized version of this.
! 	    if (d instanceof NiceMethod)
! 	      d.addSpecializedMethod(this);
  
! 	    // Therefore, all its implementations also belong to this.
! 	    addAllAlternatives(d, this);
! 	  }
!       }
  
!     homonyms = null;
!   }
  
!   private boolean specializes
!     (VarSymbol s,
!      mlsub.typing.Domain ourDomain, mlsub.typing.Domain itsDomain)
!   =
!      mlsub.typing.Typing.smaller(ourDomain, itsDomain, true)
!   && ! nice.tools.typing.Types.typeParameterDispatch(this.getType(), s.getType());
  
!   private boolean isSpecializedBy
!     (MethodDeclaration d, VarSymbol s,
!      mlsub.typing.Domain ourDomain, mlsub.typing.Domain itsDomain)
!   {
!     // Only consider imported methods.
!     // Methods being compiled will be found in the direct way
!     // if they override this method.
!     if (d.module == null || ! d.module.compiled())
!       return false;
  
!     return
!       mlsub.typing.Typing.smaller(itsDomain, ourDomain, true) &&
!     ! nice.tools.typing.Types.typeParameterDispatch(s.getType(), this.getType());
    }
  
    private UserError reportReturnTypeError
!     (boolean shouldBeLessPrecise, MethodDeclaration than)
    {
!     let message = shouldBeLessPrecise ?
  "This return type should be less precise than the return type of method" :
  "This return type is less precise than the original return type of method";
***************
*** 163,167 ****
    {
      if (! nice.tools.typing.Types.covariantSpecialization(this.getType(), s.getType()))
!       this.reportReturnTypeError(shouldBeLess: false, than: d);
  
      // Check if we are a proper specialization, or if we actually have
--- 176,180 ----
    {
      if (! nice.tools.typing.Types.covariantSpecialization(this.getType(), s.getType()))
!       this.reportReturnTypeError(shouldBeLessPrecise: false, than: d);
  
      // Check if we are a proper specialization, or if we actually have



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