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Ingy döt Net 2023-07-01 11:58:00 -04:00
parent 7387c8f97b
commit cb5bb5e222
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Task/Set/Simula/set.simula Normal file
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SIMSET
BEGIN
! WE DON'T SUBCLASS HEAD BUT USE COMPOSITION FOR CLASS SET ;
CLASS SET;
BEGIN
PROCEDURE ADD(E); REF(ELEMENT) E;
BEGIN
IF NOT ISIN(E, THIS SET) THEN E.CLONE.INTO(H);
END**OF**ADD;
BOOLEAN PROCEDURE EMPTY; EMPTY := H.EMPTY;
REF(LINK) PROCEDURE FIRST; FIRST :- H.FIRST;
REF(HEAD) H;
H :- NEW HEAD;
END**OF**SET;
! WE SUBCLASS LINK FOR THE ELEMENTS CONTAINED IN THE SET ;
LINK CLASS ELEMENT;
VIRTUAL:
PROCEDURE ISEQUAL IS
BOOLEAN PROCEDURE ISEQUAL(OTHER); REF(ELEMENT) OTHER;;
PROCEDURE REPR IS
TEXT PROCEDURE REPR;;
PROCEDURE REPR IS
REF(ELEMENT) PROCEDURE CLONE;;
BEGIN
END**OF**ELEMENT;
REF(SET) PROCEDURE UNION(S1, S2); REF(SET) S1, S2;
BEGIN REF(SET) SU, S;
SU :- NEW SET;
FOR S :- S1, S2 DO
BEGIN
IF NOT S.EMPTY THEN
BEGIN REF(ELEMENT) E;
E :- S.FIRST;
WHILE E =/= NONE DO
BEGIN SU.ADD(E); E :- E.SUC;
END;
END;
END;
UNION :- SU;
END**OF**UNION;
REF(SET) PROCEDURE INTERSECTION(S1, S2); REF(SET) S1, S2;
BEGIN REF(SET) SI;
SI :- NEW SET;
IF NOT S1.EMPTY THEN
BEGIN REF(ELEMENT) E;
E :- S1.FIRST;
WHILE E =/= NONE DO
BEGIN IF ISIN(E, S2) THEN SI.ADD(E); E :- E.SUC;
END;
END;
INTERSECTION :- SI;
END**OF**INTERSECTION;
REF(SET) PROCEDURE MINUS(S1, S2); REF(SET) S1, S2;
BEGIN REF(SET) SM;
SM :- NEW SET;
IF NOT S1.EMPTY THEN
BEGIN REF(ELEMENT) E;
E :- S1.FIRST;
WHILE E =/= NONE DO
BEGIN IF NOT ISIN(E, S2) THEN SM.ADD(E); E :- E.SUC;
END;
END;
MINUS :- SM;
END**OF**MINUS;
BOOLEAN PROCEDURE ISSUBSET(S1, S2); REF(SET) S1, S2;
BEGIN BOOLEAN B;
B := TRUE;
IF NOT S1.EMPTY THEN
BEGIN REF(ELEMENT) E;
E :- S1.FIRST;
WHILE B AND E =/= NONE DO
BEGIN
B := ISIN(E, S2);
E :- E.SUC;
END;
END;
ISSUBSET := B;
END**OF**ISSUBSET;
BOOLEAN PROCEDURE ISEQUAL(S1, S2); REF(SET) S1, S2;
BEGIN
ISEQUAL := ISSUBSET(S1, S2) AND THEN ISSUBSET(S2, S1)
END**OF**ISEQUAL;
BOOLEAN PROCEDURE ISIN(ELE,S); REF(ELEMENT) ELE; REF(SET) S;
BEGIN
REF(ELEMENT) E; BOOLEAN FOUND;
IF NOT S.EMPTY THEN
BEGIN
E :- S.FIRST;
FOUND := E.ISEQUAL(ELE);
WHILE NOT FOUND AND E =/= NONE DO
BEGIN FOUND := E.ISEQUAL(ELE); E :- E.SUC;
END;
END;
ISIN := FOUND
END**OF**ISIN;
PROCEDURE OUTSET(S); REF(SET) S;
BEGIN
REF(ELEMENT) E;
OUTCHAR('{');
IF NOT S.EMPTY THEN
BEGIN
E :- S.FIRST; OUTTEXT(E.REPR);
FOR E :- E.SUC WHILE E =/= NONE DO
BEGIN OUTTEXT(", "); OUTTEXT(E.REPR);
END;
END;
OUTCHAR('}');
END**OF**OUTSET;
COMMENT ============== EXAMPLE USING SETS OF NUMBERS ============== ;
ELEMENT CLASS NUMBER(N); INTEGER N;
BEGIN
BOOLEAN PROCEDURE ISEQUAL(OTHER); REF(ELEMENT) OTHER;
ISEQUAL := N = OTHER QUA NUMBER.N;
TEXT PROCEDURE REPR;
BEGIN TEXT T; INTEGER I;
T :- BLANKS(20); T.PUTINT(N);
T.SETPOS(1);
WHILE T.GETCHAR = ' ' DO;
REPR :- T.SUB(T.POS - 1, T.LENGTH - T.POS + 2);
END;
REF(ELEMENT) PROCEDURE CLONE;
CLONE :- NEW NUMBER(N);
END**OF**NUMBER;
PROCEDURE REPORT(S1, MSG1, S2, MSG2, S3); REF(SET) S1, S2, S3; TEXT MSG1, MSG2;
BEGIN
OUTSET(S1); OUTCHAR(' ');
OUTTEXT(MSG1); OUTCHAR(' ');
OUTSET(S2); OUTCHAR(' ');
OUTTEXT(MSG2); OUTCHAR(' ');
OUTSET(S3);
OUTIMAGE;
END**OF**REPORT;
PROCEDURE REPORTBOOL(S1, MSG1, S2, MSG2, B); REF(SET) S1, S2; TEXT MSG1, MSG2; BOOLEAN B;
BEGIN
OUTSET(S1); OUTCHAR(' ');
OUTTEXT(MSG1); OUTCHAR(' ');
OUTSET(S2); OUTCHAR(' ');
OUTTEXT(MSG2); OUTCHAR(' ');
OUTTEXT(IF B THEN "T" ELSE "F");
OUTIMAGE;
END**OF**REPORTBOOL;
PROCEDURE REPORTNUMBOOL(N1, MSG1, S1, MSG2, B); REF(ELEMENT) N1; REF(SET) S1; TEXT MSG1, MSG2; BOOLEAN B;
BEGIN
OUTTEXT(N1.REPR); OUTCHAR(' ');
OUTTEXT(MSG1); OUTCHAR(' ');
OUTSET(S1); OUTCHAR(' ');
OUTTEXT(MSG2); OUTCHAR(' ');
OUTTEXT(IF B THEN "T" ELSE "F");
OUTIMAGE;
END**OF**REPORTNUMBOOL;
REF(SET) S1, S2, S3, S4, S5;
REF(ELEMENT) E;
INTEGER I;
S1 :- NEW SET; FOR I := 1, 2, 3, 4 DO S1.ADD(NEW NUMBER(I));
S2 :- NEW SET; FOR I := 3, 4, 5, 6 DO S2.ADD(NEW NUMBER(I));
S3 :- NEW SET; FOR I := 3, 1 DO S3.ADD(NEW NUMBER(I));
S4 :- NEW SET; FOR I := 1, 2, 3, 4, 5 DO S4.ADD(NEW NUMBER(I));
S5 :- NEW SET; FOR I := 4, 3, 2, 1 DO S5.ADD(NEW NUMBER(I));
REPORT(S1, "UNION", S2, " = ", UNION(S1, S2));
REPORT(S1, "INTERSECTION", S2, " = ", INTERSECTION(S1, S2));
REPORT(S1, "MINUS", S2, " = ", MINUS(S1, S2));
REPORT(S2, "MINUS", S1, " = ", MINUS(S2, S1));
E :- NEW NUMBER(2);
REPORTNUMBOOL(E, "IN", S1, " = ", ISIN(E, S1));
E :- NEW NUMBER(10);
REPORTNUMBOOL(E, "NOT IN", S1, " = ", NOT ISIN(E, S1));
REPORTBOOL(S1, "IS SUBSET OF", S1, " = ", ISSUBSET(S1, S1));
REPORTBOOL(S3, "IS SUBSET OF", S1, " = ", ISSUBSET(S3, S1));
REPORTBOOL(S4, "IS SUPERSET OF", S1, " = ", ISSUBSET(S1, S4));
REPORTBOOL(S1, "IS EQUAL TO", S2, " = ", ISEQUAL(S1, S2));
REPORTBOOL(S2, "IS EQUAL TO", S2, " = ", ISEQUAL(S2, S2));
REPORTBOOL(S1, "IS EQUAL TO", S5, " = ", ISEQUAL(S1, S5));
END.