Copyright 1996-2003 John D. Polstra.
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* modification, are permitted provided that the following conditions
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* This product includes software developed by John D. Polstra.
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* $Id: RCSRevNum.i3.html,v 1.3 2010-04-29 17:20:02 wagner Exp $
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.