Copyright (C) 1994, Digital Equipment Corporation
All rights reserved.
See the file COPYRIGHT for a full description.
File: M3ID.i3
Last modified on Fri Aug 26 15:23:05 PDT 1994 by kalsow
modified on Sat Feb 24 01:03:39 1990 by muller
INTERFACE M3ID;
An M3ID.T represents a Modula-3 identifier. Equal identifiers
are represented by the same M3ID.T. Any non-NULL character
may be included in an M3ID.T.
IMPORT M3Buf;
TYPE T = [-16_7fffffff-1 .. 16_7fffffff]; (* a 32-bit integer *)
CONST NoID = 0; (* an illegal ID, never returned by Add or FromStr *)
PROCEDURE Add (x: TEXT; class: [0..255] := 0): T;
Returns the ID representing x and sets the class of the ID to class.
PROCEDURE FromStr (READONLY buf: ARRAY OF CHAR; length: INTEGER := 99999): T;
Returns the ID representing buf[0 .. MIN(HIGH(buf), length-1)].
PROCEDURE ToText (t: T): TEXT;
Returns a text equal to the one t represents.
PROCEDURE GetClass (t: T): INTEGER;
Returns the class assigned to t.
PROCEDURE Hash (t: T): INTEGER;
Returns the hash value of t.
PROCEDURE Put (wr: M3Buf.T; t: T);
== M3Buf.PutText (ToText(t)), without the implied TEXT allocation
PROCEDURE AdvanceMarks ();
start using a new set of marks. They're recycled after 256 advances.
PROCEDURE SetMark (t: T): BOOLEAN;
Return TRUE if SetMark(t) hash been called since the last call
to AdvanceMarks. There's a chance for false positives, so clients
must be prepared to check that t was indeed marked twice.
PROCEDURE IsLT (a, b: T): BOOLEAN;
Return TRUE if the text represented by a is lexicographically
less than the one represented by b.
END M3ID.