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RCSNUSP/COBOL: Difference between revisions
Modularised code.
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(Modularised code.) |
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{{works with|GNU Cobol|2.0}}
snusp.cob:
<lang cobol> >>SOURCE FREE
IDENTIFICATION DIVISION.
PROGRAM-ID. snusp-interpreter.
ENVIRONMENT DIVISION.
CONFIGURATION SECTION.
REPOSITORY.
FUNCTION find-initial
FUNCTION ALL INTRINSIC
.
DATA DIVISION.
WORKING-STORAGE SECTION.
COPY "dd-program-arguments.cpy".
COPY "dd-code-area.cpy".
01 program-state-flag PIC X VALUE SPACE.
88 program-ok VALUE SPACE.
88 empty-stack VALUE "E".
88 out-of-code-space VALUE "O".
01 memory-area.
03 memory-rows OCCURS 1024 TIMES.
Line 62 ⟶ 34:
07 memory-cell USAGE BINARY-CHAR.
07 memory-cell-char REDEFINES memory-cell PIC X.
01 num-threads PIC 99 COMP VALUE 1.
01 threads-data-area.
Line 78 ⟶ 50:
88 left-dir VALUE "L".
88 right-dir VALUE "R".
09
11 ip-char USAGE INDEX.
05 memory-pointer.
07 row-idx USAGE INDEX.
Line 85 ⟶ 58:
01 input-char PIC X.
01 current-thread-idx USAGE INDEX.
PROCEDURE DIVISION.
000-main SECTION.
001-
CALL "parse-arguments" USING program-arguments
IF code-file-path = SPACES
DISPLAY "No file path specified."
END-IF
CALL "read-code-file" USING CONTENT code-file-path, REFERENCE code-area
MOVE find-initial(code-area) TO instruction-ptr (1, 1)
.
010-interpret-code.
SET right-dir (1, 1) TO TRUE
SET stack-idx, thread-idx, row-idx (1), col-idx (1) TO 1
Line 179 ⟶ 83:
PERFORM 200-stop-thread
END-IF
EVALUATE code-chars (ip-line (thread-idx, stack-idx),
ip-char (thread-idx, stack-idx))
Line 185 ⟶ 89:
WHEN "<" *> LEFT
SET col-idx (thread-idx) DOWN BY 1
WHEN ">" *> RIGHT
SET col-idx (thread-idx) UP BY 1
WHEN "+" *> INCR
ADD 1 TO
memory-cell (row-idx (thread-idx), col-idx (thread-idx))
WHEN "-" *> DECR
SUBTRACT 1 FROM
memory-cell (row-idx (thread-idx), col-idx (thread-idx))
WHEN "." *> WRITE
IF NOT write-numbers
Line 205 ⟶ 109:
col-idx (thread-idx))
END-IF
WHEN "," *> READ
IF NOT read-numbers
Line 214 ⟶ 118:
col-idx (thread-idx))
END-IF
*> LURD (/ is not used as it is mucks up syntax highlighting.)
WHEN X"5C"
Line 227 ⟶ 131:
SET down-dir (thread-idx, stack-idx) TO TRUE
END-EVALUATE
WHEN "/" *> RULD
EVALUATE TRUE
Line 240 ⟶ 144:
SET up-dir (thread-idx, stack-idx) TO TRUE
END-EVALUATE
WHEN "!" *> SKIP
PERFORM 100-move-instruction-ptr
WHEN "?" *> SKIPZ
IF memory-cell (row-idx (thread-idx), col-idx (thread-idx))
Line 249 ⟶ 153:
PERFORM 100-move-instruction-ptr
END-IF
*> Modular SNUSP
WHEN "@" *> ENTER
Line 256 ⟶ 160:
TO calls (thread-idx, stack-idx + 1)
SET stack-idx UP BY 1
WHEN "#" *> LEAVE
IF stack-idx <> 1
Line 266 ⟶ 170:
PERFORM 200-stop-thread
END-IF
*> Bloated SNUSP
WHEN ":" *> UP
SET row-idx (thread-idx) UP BY 1
WHEN ";" *> DOWN
SET row-idx (thread-idx) DOWN BY 1
WHEN "&" *> SPLIT
*> Create a new thread
Line 280 ⟶ 184:
MOVE memory-pointer (thread-idx) TO call-stack (num-threads)
SET thread-started (thread-idx) TO TRUE
WHEN "%" *> RAND
COMPUTE memory-cell (row-idx (thread-idx),
Line 287 ⟶ 191:
memory-cell (row-idx (thread-idx),
col-idx (thread-idx)) + 1)
WHEN OTHER
CONTINUE
END-EVALUATE
IF out-of-code-space
PERFORM 200-stop-thread
Line 323 ⟶ 228:
MOVE threads-data (thread-idx + 1) TO threads-data (thread-idx)
END-PERFORM
SUBTRACT 1 FROM num-threads
SET thread-idx TO current-thread-idx
Line 330 ⟶ 235:
EXIT
.
END PROGRAM snusp-interpreter.
IDENTIFICATION DIVISION.
PROGRAM-ID. parse-arguments.
DATA DIVISION.
LOCAL-STORAGE SECTION.
01 num-args PIC 9 COMP.
01 arg-num PIC 9 COMP.
01 arg
COPY "dd-flag-constants.cpy".
01 program-flag PIC X.
88 help-flag VALUE Help-Flag-Char.
88 read-num-flag VALUE Read-Num-Flag-Char.
88 write-num-flag VALUE Write-Num-Flag-Char.
LINKAGE SECTION.
COPY "dd-program-arguments.cpy".
PROCEDURE DIVISION USING program-arguments.
ACCEPT num-args FROM ARGUMENT-NUMBER
IF num-args = 0
CALL "display-help"
STOP RUN
END-IF
PERFORM VARYING arg-num FROM 1 BY 1 UNTIL arg-num > num-args
DISPLAY arg-num UPON ARGUMENT-NUMBER
ACCEPT arg FROM ARGUMENT-VALUE
EVALUATE TRUE
WHEN arg (1:1) = Flag-Indicator
MOVE arg (2:1) TO program-flag
EVALUATE TRUE
WHEN help-flag
CALL "display-help"
STOP RUN
WHEN read-num-flag
SET read-numbers TO TRUE
WHEN write-num-flag
SET write-numbers TO TRUE
WHEN OTHER
DISPLAY "Flag '" FUNCTION TRIM(arg) "' not recongnized."
END-EVALUATE
WHEN code-file-path <> SPACES
DISPLAY "Argument " arg-num " ignored - only one source code "
"file can be interpreted."
WHEN OTHER
MOVE arg TO code-file-path
END-EVALUATE
END-PERFORM
.
END PROGRAM
IDENTIFICATION DIVISION.
PROGRAM-ID. read-code-file.
ENVIRONMENT DIVISION.
INPUT-OUTPUT SECTION.
FILE-CONTROL.
SELECT code-file ASSIGN code-file-path
ORGANIZATION LINE SEQUENTIAL
FILE STATUS code-file-status.
DATA DIVISION.
FILE SECTION.
FD code-file.
01 code-record PIC X(100).
LOCAL-STORAGE SECTION.
01 code-file-status PIC 99.
88 end-of-code-file VALUE 10.
LINKAGE SECTION.
COPY "dd-code-area.cpy".
01 code-file-path PIC X(100).
PROCEDURE DIVISION USING code-file-path, code-area.
DECLARATIVES.
code-file-error SECTION.
USE AFTER ERROR ON code-file.
DISPLAY "An error occurred while using " FUNCTION TRIM(code-file-path)
DISPLAY "Error code " code-file-status
DISPLAY "The program will terminate."
GOBACK
.
END DECLARATIVES.
OPEN INPUT code-file
PERFORM VARYING line-idx FROM 1 BY 1 UNTIL end-of-code-file
ADD 1 TO num-lines
READ code-file INTO code-lines (line-idx)
AT END
SUBTRACT 1 FROM num-lines
EXIT PERFORM
END-READ
END-PERFORM
CLOSE code-file
.
END PROGRAM read-code-file.
IDENTIFICATION DIVISION.
FUNCTION-ID. find-initial.
DATA DIVISION.
LINKAGE SECTION.
COPY "dd-code-area.cpy".
01 instruction-ptr.
03 ip-line USAGE INDEX.
03 ip-char USAGE INDEX.
PROCEDURE DIVISION USING code-area RETURNING instruction-ptr.
PERFORM VARYING ip-line FROM 1 BY 1 UNTIL ip-line > num-lines
AFTER ip-char FROM 1 BY 1 UNTIL ip-char > 100
IF code-chars (ip-line, ip-char) = "$"
EXIT PERFORM
END-IF
END-PERFORM
*> Set position to first char if no initial characters were found.
IF ip-line > num-lines
SET ip-line, ip-char TO 1
END-IF
.
END FUNCTION find-initial.
IDENTIFICATION DIVISION.
PROGRAM-ID. display-help.
DATA DIVISION.
WORKING-STORAGE SECTION.
COPY "dd-flag-constants.cpy".
01 Tab-Char CONSTANT X"09".
PROCEDURE DIVISION.
DISPLAY "This is a interpreter for SNUSP written in COBOL."
DISPLAY "The file path to the source code should be specified as a "
"command-line argument."
DISPLAY "This program supports the following flags as arguments:"
DISPLAY Tab-Char Flag-Indicator Help-Flag-Char ": Displays this help "
"message."
DISPLAY Tab-Char Flag-Indicator Write-Num-Flag-Char ": Display memory "
"contents as numbers."
DISPLAY Tab-Char Flag-Indicator Read-Num-Flag-Char ": Reads a byte to "
"memory as a number."
.
END PROGRAM display-help.</lang>
dd-code-area.cpy:
<lang cobol>01 code-area.
03 num-lines PIC 9(4) COMP.
03 code-lines OCCURS 1 TO 1024 TIMES
DEPENDING ON num-lines
INDEXED BY line-idx.
05 code-chars PIC X OCCURS 100 TIMES.</lang>
dd-flag-constants.cpy:
<lang cobol>01 Flag-Indicator CONSTANT "-".
01 Help-Flag-Char CONSTANT "h".
01 Read-Num-Flag-Char CONSTANT "r".
01 Write-Num-Flag-Char CONSTANT "w".</lang>
dd-programs-arguments.cpy:
<lang cobol>01 program-arguments.
03 code-file-path PIC X(100).
03 read-flag PIC X.
88 read-numbers VALUE "N".
03 write-flag PIC X.
88 write-numbers VALUE "N".</lang>
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