Copyright 1996-2003 John D. Polstra.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgment:
* This product includes software developed by John D. Polstra.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
INTERFACE RCSRevNum;
IMPORT Word;
CONST
Brand = "RCSRevNum";
TYPE
T = TEXT;
An RCSRevNum.T represents an RCS revision number, in text form.
PROCEDURE Cat(r1, r2: T): T;
Returns the concatenation of the two revision numbers.
PROCEDURE Compare(r1, r2: T): [-1..1];
The comparison is lexicographic.
PROCEDURE Equal(r1, r2: T): BOOLEAN;
Returns Text.Equal(r1, r2).
PROCEDURE Hash(r: T): Word.T;
Return a hash value suitable for use with a hash table.
PROCEDURE Last(r: T): T;
Returns the last component.
PROCEDURE NumParts(r: T): CARDINAL;
Returns the number of numeric parts in the revision number. I.e.,
returns the number of periods + 1.
PROCEDURE IsTrunk(r: T): BOOLEAN;
Returns the equivalent of NumParts(r) = 2.
PROCEDURE Prefix(r: T): T;
Returns everything except the last component and its preceding dot.
PROCEDURE IsCVSBranch(r: T): BOOLEAN;
<=> n > 2 AND n MOD 2 = 1 OR
n > 2 AND n MOD 2 = 0 AND Last(Prefix(r)) = 0
for n = NumParts(r)
END RCSRevNum.