Add BF-RUN.COB (Brainfuck interpreter)
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Quinn Evans
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IDENTIFICATION DIVISION.
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PROGRAM-ID. "BF-RUN".
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DATA DIVISION.
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WORKING-STORAGE SECTION.
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01 STATE USAGE COMPUTATIONAL.
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03 IN-PTR PIC 9(3) VALUE 1.
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03 IP PIC 9(3) VALUE 1.
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03 CYCLES PIC 9(5) VALUE 0.
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03 OUT-PTR PIC 9(3) VALUE 1.
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03 LOOP-DEPTH PIC 9 VALUE 0.
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03 LOOP-WORK PIC 9 VALUE 0.
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03 LOOP-STATE PIC 99 VALUE 0.
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88 DONE VALUE 99.
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01 BF-MEMORY.
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03 BF-CELL PIC S999
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USAGE COMPUTATIONAL
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OCCURS 9999 TIMES
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INDEXED BY CURRENT-CELL.
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01 CURRENT-INSTRUCTION PIC X.
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88 BF-LEFT VALUE "<".
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88 BF-RIGHT VALUE ">".
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88 BF-DEC VALUE "-".
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88 BF-INC VALUE "+".
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88 BF-OUT VALUE ".".
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88 BF-IN VALUE ",".
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88 BF-BEGIN VALUE "(".
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88 BF-END VALUE ")".
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01 I-O-CHARACTER PIC X.
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88 ESCAPE-CHAR VALUE "$".
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01 CONVERSION.
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03 CHAR-CODE PIC 999.
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03 COBOL-STRING PIC X(6).
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LINKAGE SECTION.
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01 BF-I-O.
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03 BF-INPUT PIC X(512).
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03 BF-CODE PIC X(512).
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03 BF-OUTPUT PIC X(512).
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03 CYCLE-LIMIT PIC 9(5).
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PROCEDURE DIVISION USING BF-I-O.
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MOVE 1 TO IN-PTR.
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MOVE 1 TO IP.
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MOVE 0 TO CYCLES.
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MOVE 1 TO OUT-PTR.
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MOVE 0 TO LOOP-DEPTH.
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MOVE 0 TO LOOP-WORK.
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MOVE 0 TO LOOP-STATE.
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MOVE 0 TO BF-MEMORY.
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SET CURRENT-CELL TO 1.
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PERFORM ZERO-CELL VARYING CURRENT-CELL
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FROM 1 BY 1
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UNTIL CURRENT-CELL IS GREATER THAN 9999.
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SET CURRENT-CELL TO 1.
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PERFORM EXECUTE-INSTRUCTION
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UNTIL CYCLES IS GREATER THAN OR EQUAL TO CYCLE-LIMIT.
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EXIT PROGRAM.
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HELL.
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EXIT PROGRAM.
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ZERO-CELL.
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MOVE 0 TO BF-CELL(CURRENT-CELL).
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READ-INSTRUCTION.
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IF IP IS LESS THAN 513 THEN
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UNSTRING BF-CODE INTO CURRENT-INSTRUCTION WITH POINTER IP
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D DISPLAY CURRENT-INSTRUCTION
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ELSE
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MOVE 99 TO LOOP-STATE.
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EXECUTE-INSTRUCTION.
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MOVE 0 TO LOOP-STATE.
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D DISPLAY IP, BF-CELL(CURRENT-CELL), LOOP-DEPTH, CYCLES.
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PERFORM READ-INSTRUCTION.
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IF DONE THEN GO TO HELL.
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IF BF-LEFT THEN
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PERFORM DO-LEFT
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ELSE IF BF-RIGHT THEN
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PERFORM DO-RIGHT
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ELSE IF BF-DEC THEN
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PERFORM DO-DEC
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ELSE IF BF-INC THEN
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PERFORM DO-INC
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ELSE IF BF-OUT THEN
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PERFORM DO-OUT
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ELSE IF BF-IN THEN
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PERFORM DO-IN
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ELSE IF BF-BEGIN THEN
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PERFORM DO-BEGIN
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ELSE IF BF-END THEN
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PERFORM DO-END.
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ADD 1 TO CYCLES.
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DO-LEFT.
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IF CURRENT-CELL IS GREATER THAN 1 THEN
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SET CURRENT-CELL DOWN BY 1
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ELSE
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SET CURRENT-CELL TO 9999.
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DO-RIGHT.
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IF CURRENT-CELL IS LESS THAN 9999 THEN
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SET CURRENT-CELL UP BY 1
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ELSE
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SET CURRENT-CELL TO 1.
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DO-DEC.
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SUBTRACT 1 FROM BF-CELL(CURRENT-CELL).
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DO-INC.
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ADD 1 TO BF-CELL(CURRENT-CELL).
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DO-OUT.
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MOVE BF-CELL(CURRENT-CELL) TO CHAR-CODE.
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CALL "DECODE-ASCII" USING CONVERSION.
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STRING COBOL-STRING,
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DELIMITED BY SPACES,
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INTO BF-OUTPUT,
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WITH POINTER OUT-PTR.
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D DISPLAY "OUT", I-O-CHARACTER, BF-CELL(CURRENT-CELL).
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DO-IN.
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UNSTRING BF-INPUT,
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INTO I-O-CHARACTER,
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WITH POINTER IN-PTR.
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IF NOT ESCAPE-CHAR THEN
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MOVE I-O-CHARACTER TO COBOL-STRING
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ELSE
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UNSTRING BF-INPUT,
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INTO I-O-CHARACTER,
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WITH POINTER IN-PTR
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IF ESCAPE-CHAR THEN
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MOVE I-O-CHARACTER TO COBOL-STRING
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ELSE
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SUBTRACT 1 FROM IN-PTR
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UNSTRING BF-INPUT,
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DELIMITED BY "$",
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INTO COBOL-STRING,
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WITH POINTER IN-PTR.
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CALL "ENCODE-ASCII" USING CONVERSION.
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MOVE CHAR-CODE TO BF-CELL(CURRENT-CELL).
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D DISPLAY "IN", I-O-CHARACTER, BF-CELL(CURRENT-CELL).
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DO-BEGIN.
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IF BF-CELL(CURRENT-CELL) IS EQUAL TO 0 THEN
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MOVE LOOP-DEPTH TO LOOP-WORK
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PERFORM FIND-END UNTIL DONE
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SUBTRACT 1 FROM IP
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ELSE
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ADD 1 TO LOOP-DEPTH.
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FIND-END.
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PERFORM READ-INSTRUCTION.
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IF NOT DONE THEN
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IF BF-BEGIN THEN
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ADD 1 TO LOOP-WORK
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ELSE IF BF-END THEN
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IF LOOP-WORK EQUALS LOOP-DEPTH THEN
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MOVE 99 TO LOOP-STATE
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ELSE
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SUBTRACT 1 FROM LOOP-WORK.
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DO-END.
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SUBTRACT 1 FROM LOOP-DEPTH.
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IF BF-CELL(CURRENT-CELL) IS NOT EQUAL TO 0 THEN
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MOVE LOOP-DEPTH TO LOOP-WORK
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PERFORM FIND-BEGIN UNTIL DONE.
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FIND-BEGIN.
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PERFORM UNREAD-INSTRUCTION.
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IF NOT DONE THEN
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IF BF-END THEN
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SUBTRACT 1 FROM LOOP-WORK
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ELSE IF BF-BEGIN THEN
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IF LOOP-WORK EQUALS LOOP-DEPTH THEN
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MOVE 99 TO LOOP-STATE
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ELSE
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ADD 1 TO LOOP-WORK.
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UNREAD-INSTRUCTION.
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IF IP IS GREATER THAN 1 THEN
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SUBTRACT 2 FROM IP
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UNSTRING BF-CODE INTO CURRENT-INSTRUCTION WITH POINTER IP
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ELSE
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MOVE 99 TO LOOP-STATE.
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