suplib/src/RCSDeltaClass.i3

 Copyright 1996-2003 John D. Polstra.
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 The RCSDeltaClass interface reveals the private implementation details
   of RCS deltas. 


INTERFACE RCSDeltaClass;

IMPORT
  RCSDelta, RCSDeltaList, RCSError, RCSFile, RCSPhrases, RCSString;

REVEAL
  RCSDelta.T = RCSDelta.Public BRANDED OBJECT
    rcsFile: RCSFile.T := NIL;
    log: RCSString.T := NIL;
    text: RCSString.T := NIL;
    next: RCSDelta.T := NIL;
    prev: RCSDelta.T := NIL;
    diffBase: RCSDelta.T := NIL;  (* = prev, next, or NIL *)
    branches: RCSDeltaList.T := NIL;
    treePhrases: RCSPhrases.T := NIL;
    textPhrases: RCSPhrases.T := NIL;
    accessor: Accessor := NIL;
    isParsed: BOOLEAN := FALSE;  (* TRUE if text has been parsed. *)
    isPlaceHolder: BOOLEAN := FALSE;
  END;

TYPE
  Accessor <: AccessorPublic;

  AccessorPublic = OBJECT METHODS
    getLine(i: CARDINAL): RCSString.T;
    numLines(): CARDINAL;
  END;

PROCEDURE AddBranch(delta: RCSDelta.T;
                    branch: RCSDelta.T;
		    diffBase: RCSDelta.T)
  RAISES {RCSError.E};

 Add a new branch to the given delta. 
 The list of branches is maintained in sorted order.  It is an error
   to add a branch that is already present. 


PROCEDURE ChangeBranch(delta, oldBranch, newBranch: RCSDelta.T)
  RAISES {RCSError.E};

 Changes a branch of the given delta to point to a different delta. 

PROCEDURE DeleteBranch(delta: RCSDelta.T; branch: RCSDelta.T)
  RAISES {RCSError.E};

 Delete a branch from a delta.  It is an error to attempt to delete a
   non-existent branch. 

END RCSDeltaClass.