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PowerMacOberon 1.2
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Sets.Mod
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Oberon Text
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1995-08-22
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108 lines
Syntax10.Scn.Fnt
MODULE Sets;
IMPORT Texts;
CONST size* = 32;
PROCEDURE Clear*(VAR s: ARRAY OF SET);
VAR i: INTEGER;
BEGIN
i := 0; WHILE i < LEN(s) DO s[i] := {}; INC(i) END
END Clear;
PROCEDURE Fill*(VAR s: ARRAY OF SET);
VAR i: INTEGER;
BEGIN
i := 0; WHILE i < LEN(s) DO s[i] := {0 .. size-1}; INC(i) END
END Fill;
PROCEDURE Incl*(VAR s: ARRAY OF SET; x: INTEGER);
BEGIN INCL(s[x DIV size], x MOD size)
END Incl;
PROCEDURE Excl*(VAR s: ARRAY OF SET; x: INTEGER);
BEGIN EXCL(s[x DIV size], x MOD size)
END Excl;
PROCEDURE In*(VAR s: ARRAY OF SET; x: INTEGER): BOOLEAN;
BEGIN RETURN x MOD size IN s[x DIV size]
END In;
PROCEDURE Includes*(VAR s1, s2: ARRAY OF SET): BOOLEAN;
VAR i: INTEGER;
BEGIN
i := 0;
WHILE i < LEN(s1) DO
IF s1[i] + s2[i] # s1[i] THEN RETURN FALSE END;
INC(i)
END;
RETURN TRUE;
END Includes;
PROCEDURE Elements*(VAR s: ARRAY OF SET; VAR lastElem: INTEGER): INTEGER;
VAR i, n, max: INTEGER;
BEGIN
i := 0; n := 0; max := SHORT(LEN(s)) * size;
WHILE i < max DO
IF (i MOD size) IN s[i DIV size] THEN INC(n); lastElem := i END;
INC(i)
END;
RETURN n
END Elements;
PROCEDURE Empty*(VAR s: ARRAY OF SET): BOOLEAN;
VAR i: INTEGER;
BEGIN
i := 0;
WHILE i < LEN(s) DO
IF s[i] # {} THEN RETURN FALSE END;
INC(i)
END;
RETURN TRUE
END Empty;
PROCEDURE Equal*(VAR s1, s2: ARRAY OF SET): BOOLEAN;
VAR i: INTEGER;
BEGIN
i := 0;
WHILE i < LEN(s1) DO
IF s1[i] # s2[i] THEN RETURN FALSE END;
INC(i)
END;
RETURN TRUE
END Equal;
PROCEDURE Different*(VAR s1, s2: ARRAY OF SET): BOOLEAN;
VAR i: INTEGER;
BEGIN
i := 0;
WHILE i < LEN(s1) DO
IF s1[i] * s2[i] # {} THEN RETURN FALSE END;
INC(i)
END;
RETURN TRUE
END Different;
PROCEDURE Unite*(VAR s1, s2: ARRAY OF SET);
VAR i: INTEGER; s: SET;
BEGIN
i := 0; WHILE i < LEN(s1) DO s := s1[i] + s2[i]; s1[i] := s; INC(i) END
END Unite;
PROCEDURE Differ*(VAR s1, s2: ARRAY OF SET);
VAR i: INTEGER; s: SET;
BEGIN
i := 0; WHILE i < LEN(s1) DO s := s1[i] - s2[i]; s1[i] := s; INC(i) END
END Differ;
PROCEDURE Intersect*(VAR s1, s2, s3: ARRAY OF SET);
VAR i: INTEGER; s: SET;
BEGIN
i := 0; WHILE i < LEN(s1) DO s := s1[i] * s2[i]; s3[i] := s; INC(i) END
END Intersect;
PROCEDURE Print*(VAR f: Texts.Writer; s: ARRAY OF SET; w, indent: INTEGER);
VAR col, i, max: INTEGER;
BEGIN
i := 0; col := indent; max := SHORT(LEN(s)) * size;
Texts.Write(f, "{");
WHILE i < max DO
IF In(s, i) THEN
IF col + 4 > w THEN
Texts.WriteLn(f);
col := 0; WHILE col < indent DO Texts.Write(f, " "); INC(col) END
END;
Texts.WriteInt(f, i, 3); Texts.Write(f, ",");
INC(col, 4)
END;
INC(i)
END;
Texts.Write(f, "}")
END Print;
END Sets.