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retro-software.B5500-software/XBASIC-Paisley-College/XBASIC.alg_m
Paul Kimpel 8f7dec7872 1. Commit proofing corrections to XBASIC from Rich Cornwell. 
2. Update file table in project README.
2016-05-04 18:09:14 -07:00

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$ SET SINGLE BEND 00000100
BEGIN 00000200
COMMENT::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: 00000300
::::: XBASIC -- A CONVERSATIONAL BASIC INTERPRETER ::::: 00000400
::::: ::::: 00000500
::::: MK XV 1.04: 1 DECEMBER 1975 ::::: 00000600
::::: ::::: 00000700
:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: 00000800
00000900
XBASIC IS A BASIC INTERPRETER DEVELOPED FOR THE BURROUGHS RANGE 00001000
OF COMPUTERS BY STAFF AT PAISLEY COLLEGE OF TECHNOLOGY. ITS PURPOSE 00001100
IS TO PROVIDE FAST RESPONSE TO SIMPLE BASIC PROGRAMS UNDER TIME- 00001200
SHARING. ACTUAL RUNNING OF PROGRAMS IS MUCH SLOWER FOR XBASIC, BUT 00001300
EXPERIENCE SHOWS THAT MOST CLASS TIME IS SPENT ON INPUT AND COMPILE. 00001400
00001500
XBASIC IS AN IMPLEMENTATION OF STANDARD BASIC, AND DIFFERS 00001600
FROM BURROUGHS BASIC IN CERTAIN MATTERS OF DETAIL. THE COMMANDS 00001700
ALLOWED IN XBASIC FORM A SUBSET OF THE COMMANDS AVAILABLE UNDER CANDE. 00001800
FILES ARE EDITABLE UNDER CANDE. TRACE AND UNTRACE STATEMENTS 00001900
CAN BE MADE AVAILABLE - SEE LINES 83300-83400 AND 107300-108700. 00002000
XBASIC OUTPUT MAY BE DIVERTED FROM REMOTE TO PRINTER ("SEND"). 00002100
VIDEO TERMINALS ARE SUPPORTED FOR EASY CORRECTION OF SOURCE PROGRAM. 00002200
PROGRAMS ARE MONITORED FOR EXCESS LOOPING. 00002300
00002400
TO USE XBASIC FROM THE BATCH TERMINAL, THE FOLLOWING 00002500
CARDS SHOULD BE SUPPLIED: 00002600
? EXECUTE 0XBASIC/UTILITY 00002700
? COMMON=2 00002800
? DATA CRD 00002900
(INSERT DECK HERE: USE TERMINAL FORMAT) 00003000
? END 00003100
00003200
:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::; 00003300
COMMENT 00003400
THE BLOCK STRUCTURE FOR THE PROGRAM IS AS FOLLOWS: 00003500
00003600
------------- /------| 00003700
1 SOURCEIN: 1 / DOES | 00003800
START-->--1 & EXECUTE 1--RUN->----< OBJECT >--YES--->---| 00003900
1 1 COMMANDS 1 | EXIST? / 1 00004000
A ------------- |------| V 00004100
1 1 1 1 00004200
1 1 (YES) V (NO) 1 00004300
1 /------| 1 1 00004400
1 / ANY | ------------- 1 00004500
1 < SYNTAX >------<----1 COMPILE: 1 1 00004600
1 | ERRORS?/ 1 1 1 00004700
1 |------/ ------------- 1 00004800
1 1 1 00004900
1 V (NO) 1 00005000
1 1 1 00005100
1 ------------- 1 00005200
|---<---1 EXECUTE: 1------------------<--------------/ 00005300
------------- 00005400
00005500
:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::; 00005600
00005700
INTEGER IU; % (COMMON) INPUT UNIT=0 VDU,1 TTY,2 CRD 00005800
00005900
INTEGER ARRAY PROG[0:200,2:11], % SOURCE STRINGS 00006000
SSEQ[0:200], % SEQUENCE NUMBERS 00006100
STYP, % STATEMENT TYPES 00006200
SPOB[1:200], % POINTERS TO OBJECTPROGRAM 00006300
SUB[1:26], % INFO ON USER FUNCTIONS 00006400
ARR[1:26,0:2], % ARRAYS 00006500
STRAR[1:26,0:1], % STRING ARRAYS 00006600
IOB[1:240],IOF[1:10], % I/O PSEUDOBUFFERS 00006700
IOBE[1:14], % " " 00006800
KEY[1:38], % COMPILE KEYWORDS 00006900
FNM[1:3,1:2]; % FILENAMES FOR EXECUTE 00007000
00007100
REAL ARRAY OBJ[0:999], % PSEUDO-OBJECTPROGRAM 00007200
FORX[1:10,1:4], % INFO ON FOR STATEMENTS 00007300
CONST[1:1000], % SOURCE PROGRAM CONSTANTS 00007400
ANSA[0:9], % FOR DISK SEARCH 00007500
IO[0:3]; % FILENAMES 00007600
00007700
INTEGER MS, % NUMBER OF LINES OF PROGRAM 00007800
ACS, % FIRST EXECUTABLE STATEMENT 00007900
CS, % CURRENT STATEMENT NUMBER 00008000
CHA, % CURRENT SOURCE CHARACTER 00008100
CP, % POSITION OF CHA IN SOURCE 00008200
LP, % SEE LOOK 00008300
CO, % POSITION IN OBJ 00008400
OU, % OUTPUT UNIT (0 REMOTE, 1 PRINTER) 00008500
MSTO, % CURRENT TOP OF ARRAYS 00008600
MSTR, % CURRENT TOP OF STRING ARRAYS 00008700
NCON, % NUMBER OF CONSTANTS 00008800
DELIM, % SEE NCH 00008900
TIM, % MAX EXECUTION TIME (2 MIN USUALLY) 00009000
LL, % CURRENT LINE NUMBER IN INPUT PAGE 00009100
AREASIZE, % FOR EXECUTE OUTPUT FILE IF ANY 00009200
BEG, % LIST COMMAND INITIAL LINE 00009300
EN, % FINAL LINE 00009400
NDEP, % ARITH STACK COUNTER 00009500
ADDR, % CURRENT VARIABLE ADDRESS 00009600
FORE,FORC, % HELP COMPILE FOR NESTS 00009700
NF, % NUMBER OF EXECUTE FILES 00009800
A,B,C,D,K; % HASH 00009900
00010000
REAL R,S,T; % HASH 00010100
00010200
BOOLEAN OBJECT, % "THERE IS AN ORJECTPROGRAM" 00010300
STRIN, % "EXPRESSION IS A STRING" 00010400
HDDR, % "PRINTER HEADER PRINTED" 00010500
INFILTOG, % "PROGRAM NEEDS INPUT FILE" 00010600
OUTFILTOG, % "PROGRAM NEEDS OUTPUT FILE" 00010700
FIRSTOFF, % "HELLO" 00010800
DANGER, % "NEW MATERIAL IN WORKFILE" 00010900
VAR, % "EXPRESSION IS A VARIABLE" 00011000
SY, % "PROGRAM CONTAINS SYNTAX ERRORS" 00011100
EQOK, % "EXPRESSION MAY CONTAIN =" 00011200
AA; % "SUCCESSIVE EXPNS TO PRINT" 00011300
00011400
POINTER PINB, % START OF LINE IN IOB[*] 00011500
PIOB, % CURRENT CHARACTER " 00011600
PIBE, % LAST CHARACTER IN IOBE[1] 00011700
POB, % FIRST CHARCTER IN OBJ[*] 00011800
APR,BPR,CPR; % HASH 00011900
00012000
FORMAT WHT ("ERR- ",A6," IS NOT A COMMAND IN XBASIC"), 00012100
STP (/"END ",A6), 00012200
SPC (/), 00012300
WRN ("MORE THAN 100 GOTOS. IS YOUR PROGRAM ALL RIGHT?"), 00012400
REP (A3), 00012500
SYER ("SYNTAX ERRORS: CLEAR SCREEN AND TRANSMIT A SPACE"), 00012600
SYR ("SYNTAX ERRORS:"), 00012700
WT ("WAIT-"), 00012800
MESS ("EXECUTING"), 00012900
INTR ("ILLEGAL NUMBER"), 00013000
LNGPRG("PROGRAM TOO LONG AT LINE ",I6), 00013100
INVIT ("VDU ASSUMED - ELSE SAY TTY"), 00013200
DVO ("OUTPUT IS BEING DIVERTED TO PRINTER"), 00013300
BK ("EXECUTION STOPPED - EXCESS TIME."/ 00013400
"FOR LONG PROGRAMS USE MAIN SYSTEM"), 00013500
SNUM (X72,I8), 00013600
F1 ("USE RENAME XXXXXX OR SAVE XXXXXX COMMAND"), 00013700
F2 ("ERR? THIS WILL DELETE THE WORKFILE"), 00013800
F3 ("OK- ",I3," RECORDS",A6,"D, LAST RECORD =",I7), 00013900
F4 ("FILE ",A6," - ",A6,A1," BY XBASIC"), 00014000
F5 ("YOUR WORKFILE IS AS AT LAST RUN COMMAND"), 00014100
F6 (I6,X3,"DIM OR FILES STATEMENT OUT OF SEQUENCE"/ 00014200
"ERR RUN"), 00014300
F7 ("WORKFILE NOW EMPTY"), 00014400
HD1 ("FURTHER OUTPUT WILL BE PRINTED WHEN YOU SIGN OFF"), 00014500
HD3 (X40,"XBASIC MK XV",X8,"RUN ",A6,"DAY ", 00014600
A2,"/",A2,"/",A2,/X54,"USER NO. ",A3,A4,/X52,20("*")//), 00014700
00014800
F9 ("XBASIC IS RUNNING-"), 00014900
F10 ("UNNAMED WORKFILE HAS",I4," RECORDS, LAST RECORD =",I6), 00015000
F11 (A6," (WORKFILE) HAS",I4," RECORDS, LAST RECORD =",I6), 00015100
F12 ("ERR- ILLEGAL PARAMETER"), 00015200
F13 ("ARE PRESENT CONTENTS OF FILE ",A6," TO BE DESTROYED?"); 00015300
00015400
SWITCH FORMAT NUM:=(U10),(U6),(X20,U10); 00015500
SWITCH FORMAT MNP:=("NOT ENOUGH INPUT AT LINE",I6,X5,"TRY AGAIN"), 00015600
("BLANK INPUT AT LINE",I6,X5,"IGNORED"); 00015700
00015800
FILE TTY 19(2,10);FILE IN CRD 2(2,10); FILE IN VDU 19(1,240); 00015900
FILE OUT LIN 1(2,14);SWITCH FILE FN:=TTY,CRD;SWITCH FILE FL:=TTY,LIN; 00016000
00016100
MONITOR INTOVR,EXPOVR,INDEX,FLAG,ZERO; 00016200
00016300
LABEL SOURCEIN,COMPILE,EXECUTE,STOP,FINSH,ERR,INCST,PER,INER, 00016400
TOOLONG; 00016500
00016600
LABEL EXS,EQL,LET,CAR,ONX,RON,IFF,FEQ,GOT,GOS,RET,FOX,NEX, 00016700
DEF,REA,RREA,INP,RAN,RES,PRI,RPRI,XPRI,DIM,ENX,REM,RFIL, 00016800
INTVR,QUOTE,RDUM,DAT,RDAT,RDIM,PAG,MAT,IOMT,FLAGR,FIL,CGO; 00016900
00017000
SWITCH OPN:=LET,GOT,GOS,RET,INP,REA,PRI,FOX,NEX,MAT, 00017100
DEF,DAT,RAN,PAG,RES,REM,ENX,ENX,IFF,ONX; 00017200
00017300
00017400
DEFINE ON(ON1)=IF CHA=ON1 THEN #; 00017500
00017600
COMMENT::::::::::::::::GLOBAL PROCEDURES::::::::::::::::::::::::::: 00017700
00017800
--- CHCONV CONVERTS CHA TO LETTER CODE 1-26 ; 00017900
00018000
INTEGER PROCEDURE CHCONV(A);VALUE A; INTEGER A; 00018100
BEGIN CHCONV:=0;IF A GTR 16 AND A LSS 26 THEN CHCONV:=A-16 ELSE 00018200
IF A GTR 32 AND A LSS 42 THEN CHCONV:=A-23 ELSE 00018300
IF A GTR 49 AND A LSS 58 THEN CHCONV:=A-31 END; 00018400
COMMENT 00018500
--- NCH PICKS NEXT CHARACTER FROM SOURCE STRING 00018600
AND STORE IT IN CHA. BLANKS ARE SKIPPED. 00018700
IF LAST CHAR- RETURN "%" AT DELIM. 00018800
CP IS UPDATED. IOBE[*] IS USED AS HASH.; 00018900
00019000
INTEGER PROCEDURE NCH; 00019100
BEGIN INTEGER A;LABEL RPT; POINTER CPR; 00019200
IOBE[1]:=0;A:=CP; 00019300
RPT: IF A GEQ DELIM THEN CHA:=NCH:="%" ELSE BEGIN 00019400
CPR:=POINTER(PROG[CS,2])+A; 00019500
REPLACE PIBE BY CPR:CPR FOR 1;A:=A+1; 00019600
IF IOBE[1]=48 THEN GO TO RPT;CHA:=NCH:=IOBE[1];CP:=A 00019700
END END; 00019800
COMMENT 00019900
--- NMBR PICKS UP STATEMENT NUMBER ; 00020000
INTEGER PROCEDURE NMBR(N);VALUE N;INTEGER N; 00020100
BEGIN LABEL DONE,RNB,BLK,NST,SKB; 00020200
DEFINE RD(RD1)=REPLACE BPR BY APR:APR FOR 1; 00020300
IF DELTA(PINB,APR) GEQ RD1 THEN GO BLK;IF IOBE[1]#; 00020400
CHA:=NMBR:=IOBE[1]:=0; 00020500
NST: RD(N)=48 THEN GO NST;IF (CHA:=IOBE[1]) GEQ 10 THEN GO DONE; 00020600
RNB: RD(72) LSS 10 THEN BEGIN CHA:=CHA|10+IOBE[1];GO RNB END; 00020700
NMBR:=CHA;CHA:=IOBE[1];IF CHA NEQ 48 THEN GO DONE; 00020800
SKB: RD(72)=48 THEN GO SKB;CHA:=IOBE[1];GO DONE; 00020900
00021000
00021100
BLK: CHA:="%"; 00021200
DONE: END; 00021300
COMMENT 00021400
--- FILECONTROL DEALS WITH SOURCE FILE OPERATIONS 00021500
A=0 "MAKE"/"RENAME", 00021600
1 "SAVE", 2 "LOAD"/"COPY", 00021700
3 "REMOVE", 4 SAVE WORKFILE(AT "RUN") 00021800
5 LOAD WORKFILE(AT XBASIC ENTRY), 00021900
6 EXPLICIT REMOVE (AT "BYE",ETC) 00022000
7 EXPLICIT SAVE, 8 EXPLICIT LOAD; 00022100
00022200
PROCEDURE FILECONTROL(A,C,D,L);VALUE A,C,D;INTEGER A;REAL C,D;LABEL L; 00022300
% C AND D CARRY LABEL EQUATE FOR EXPLICIT OPERATIONS 00022400
BEGIN INTEGER B,X,Y; 00022500
PROCEDURE FILERR(E);VALUE E;INTEGER E; 00022600
BEGIN SWITCH FORMAT ERR:=("ERR- ",A3,A4,"/",A3,A4,"- NOT ON DISK"), 00022700
("ERR- ",A3,A4,"/",A3,A4," - INVALID USER"), 00022800
("ERR- ",A3,A4,"/",A3,A4," - NON-STANDARD"), 00022900
("ERR- ",A3,A4,"/",A3,A4," - ILLEGAL NAME"), 00023000
("ERR- ",A3,A4,"/",A3,A4," - DUPLICATE NAME"), 00023100
("ERR- NO FILENAME"), 00023200
("ERR- WORKFILE"), 00023300
("ERR- WORKFILE IS EMPTY"); 00023400
00023500
IF E>4 THEN WRITE(TTY,ERR[E]) ELSE WRITE(TTY,ERR[E], 00023600
FOR X:=B,2 DO [IO[X].[41:18],IO[X].[23:24]]); 00023700
IF B=0 THEN IO[0]:=0;IF A=1 AND E=3 THEN WRITE(TTY,F1); 00023800
GO SOURCEIN END; 00023900
LABEL SKIP,MK,SV,LD,RM,EF,SW,LW,EW; 00024000
SWITCH OP:=MK,SV,LD,RM,SW,LW,RM,SV,LD; 00024100
FILE DSK DISK "XBWKFL "(2,10,300,SAVE 7);% NB LABEL EQN ABOVE SKIP 00024200
IF DANGER AND (C="CREATE" OR A=2 OR A=6) THEN BEGIN DANGER:=FALSE; 00024300
WRITE(TTY,F2);GO SOURCEIN END; 00024400
B:=IF A=0 THEN 0 ELSE 1;IF A>3 THEN BEGIN 00024500
FILL DSK WITH C,D;IO[1]:=C;IO[2]:=D;GO SKIP END; 00024600
IO[B]:=" "; % FILENAME 00024700
SCAN APR:APR FOR 5 UNTIL NEQ " ";IF DELTA(PINB,APR)<12 THEN 00024800
REPLACE POINTER(IO[B])+1 BY APR:APR FOR IF A<2 THEN 6 ELSE 7 00024900
WHILE IN ALPHA; 00025000
IF IO[B]=" " THEN BEGIN % ON SAVE SAVE WKFILE IF NO NAME 00025100
IF A=1 AND IO[0] NEQ 0 THEN IO[1]:=IO[0] ELSE FILERR(5) END; 00025200
IO[2]:=0;IF A GTR 1 THEN BEGIN % PROCESS "/USERCODE" IF PRESENT 00025300
SCAN CPR:CPR:=APR FOR 10 WHILE NEQ "/";IF DELTA(PINB,CPR) LSS 15 THEN 00025400
BEGIN IO[2]:=" "; 00025500
REPLACE POINTER(IO[2])+1 BY APR:CPR+1 FOR 7 WHILE IN ALPHA END END; 00025600
IF IO[2]=0 THEN IO[2]:=TIME(-1); 00025700
IF IO[B]="XBWKFL " OR IO[B].[41:36] LSS "A00000" THEN FILERR(3); 00025800
FILL DSK WITH IO[B],IO[2];DSK.SAVE:=7; 00025900
SKIP: IF NOT FIRSTOFF THEN BEGIN X:=CHA;Y:=NMBR(72); 00026000
IF Y NEQ 0 OR CHA NEQ "%" THEN GO PER;CHA:=X END; 00026100
SEARCH(DSK,ANSA[*]);IF (A=5 OR A=6) AND ANSA[0]=-1 THEN GO L; 00026200
IF A=0 AND ANSA[0] NEQ -1 THEN FILERR(4); 00026300
IF A=1 AND IO[1] NEQ IO[0] AND ANSA[0] NEQ -1 THEN FILERR(4); 00026400
IF A>1 AND A NEQ 4 THEN BEGIN IF ANSA[0] LEQ 0 THEN FILERR(ANSA[0]+1); 00026500
IF ANSA[3] NEQ 10 OR ANSA[4] NEQ 300 THEN FILERR(2) END; 00026600
IF CHA="MAKE00" THEN BEGIN MS:=0;OBJECT:=FALSE END; 00026700
GO OP[A+1]; 00026800
SV: IF IO[0]=0 THEN IO[0]:=IO[B]; % NAME WORKFILE 00026900
IF MS=0 THEN FILERR(7);IF ANSA[0] NEQ -1 AND ANSA[0] NEQ 7 THEN 00027000
FILERR(1);DSK.AREAS:=20;DSK.AREASIZE:=10; 00027100
FOR CS:=1 STEP 1 UNTIL MS DO BEGIN % SAVE IT IN CANDE FORMAT 00027200
REPLACE POINTER(IOBE[10]) BY SSEQ[CS] FOR 8 DIGITS; 00027300
REPLACE POINTER(IOBE[*]) BY POINTER(PROG[CS,2]) FOR 9 WORDS; 00027400
WRITE(DSK,10,IOBE[*]) END;LOCK(DSK);DANGER:=FALSE;GO MK; 00027500
LD: FOR MS:=1 STEP 1 UNTIL 200 DO BEGIN % LOAD FROM 00027600
READ(DSK,10,IOBE[*])[EF];READ(IOBE[*],SNUM,SSEQ[MS]); % CANDE FORMAT 00027700
WRITE(PROG[MS,*],9,IOBE[*]);PROG[MS,11]:=SSEQ[MS] END; 00027800
EF: MS:=MS-1;OBJECT:=FALSE;LOCK(DSK); 00027900
WRITE(TTY,F3,MS,C,SSEQ[MS]); 00028000
ON("LOAD00") IO[0]:=IF IO[2]=TIME(-1) THEN IO[1] ELSE 0;GO MK; 00028100
RM: IF IO[B]=IO[0] AND A=3 THEN BEGIN IF MS=0 THEN 00028200
IO[0]:=0 ELSE FILERR(6) END;IF ANSA[0] NEQ 7 THEN FILERR(1); 00028300
WRITE(DSK,*,0);CLOSE(DSK,PURGE);GO MK; 00028400
SW: DSK.AREAS:=20;DSK.AREASIZE:=11; 00028500
IF MS=0 THEN FILERR(7); 00028600
WRITE(DSK,*,IO[0]);FOR CS:=1 STEP 1 UNTIL MS DO 00028700
WRITE(DSK,10,PROG[CS,*]);LOCK(DSK);DANGER:=FALSE;GO MK; 00028800
LW: READ(DSK,*,IO[0]);FOR MS:=1 STEP 1 UNTIL 200 DO 00028900
BEGIN READ(DSK,10,PROG[MS,*])[EW];SSEQ[MS]:=PROG[MS,11] END; 00029000
EW: LOCK(DSK);MS:=MS-1;OBJECT:=FALSE;GO MK; 00029100
MK: IF A<4 AND CHA NEQ "COPY00" THEN 00029200
WRITE(TTY,F4,IO[B].[41:36],C,D); 00029300
IF A=5 THEN WRITE(TTY,F5); 00029400
IF CHA="COPY00" THEN WRITE(TTY,STP,"COPY "); 00029500
GO L END; 00029600
COMMENT 00029700
--- SYNT DEALS WITH SYNTAX ERRORS ; 00029800
00029900
PROCEDURE SYNT(A);VALUE A;REAL A; 00030000
BEGIN IF SY THEN BEGIN IF IU=0 THEN BEGIN WRITE(TTY,SYER); 00030100
READ(TTY[STOP]) END ELSE WRITE(TTY,SYR);SY:=FALSE END; 00030200
REPLACE APR:=POINTER(IOBE[*]) BY " " FOR 72; 00030300
WRITE(IOBE[*],NUM[0],SSEQ[CS]);SCAN APR:APR WHILE NEQ 48; 00030400
IF IU=0 THEN BEGIN REPLACE APR:APR BY POINTER(PROG[CS,*]) FOR 72; 00030500
APR:=POINTER(IOBE[*])+72; 00030600
REPLACE APR:APR BY "!" FOR 1 END ELSE APR:=APR+3; 00030700
REPLACE POB BY A FOR 8;REPLACE APR BY POB+1 FOR 7; 00030800
OBJ[1]:=0;REPLACE POB+7 BY POINTER(IOBE[*])+79 FOR 1; 00030900
IF IU GTR 0 THEN WRITE(TTY,9,IOBE[*]) ELSE IF OBJ[1]=48 THEN 00031000
WRITE(TTY,10,IOBE[*]) ELSE WRITE(TTY[NO],10,IOBE[*]);GO TO ERR END; 00031100
COMMENT 00031200
--- NWC MODIFIES NCH FOR COMPILE ; 00031300
00031400
INTEGER PROCEDURE NWC; 00031500
BEGIN ON("%") SYNT("MISG OP");NWC:=NCH END; 00031600
00031700
COMMENT 00031800
--- PUT STORES CHARACTER IN OBJ ; 00031900
00032000
PROCEDURE PUT(A);VALUE A;INTEGER A; 00032100
BEGIN IF A>63 THEN SYNT("STR >63"); 00032200
IOBE[1]:=A;REPLACE POB+CO BY PIBE FOR 1;CO:=CO+1; 00032300
IF CO GEQ 8000 THEN GO TO TOOLONG;IF CO MOD 8=0 THEN CO:=CO+1 END; 00032400
COMMENT 00032500
--- RED MOVES BACK ONE SPACE IN OBJ; 00032600
00032700
DEFINE RED=CO:=IF CO.[2:3]=1 THEN CO-2 ELSE CO-1#; 00032800
00032900
COMMENT 00033000
--- LOOK LOOKS AT A STRING IN SOURCE PROG ; 00033100
00033200
INTEGER PROCEDURE LOOK(A);VALUE A;INTEGER A; 00033300
BEGIN INTEGER B,C,D,E;E:=C:=CHA;B:=CP; 00033400
FOR D:=1 STEP 1 UNTIL A-1 DO IF CHA NEQ "%" THEN C:=C|64+NWC; 00033500
LOOK:=C;LP:=CP;CP:=B;CHA:=E END; 00033600
COMMENT 00033700
--- NUMB PICKS UP DIM AND MAT SIZES ; 00033800
00033900
INTEGER PROCEDURE NUMB; 00034000
BEGIN LABEL RP;INTEGER A; 00034100
A:=0; 00034200
RP: IF NWC LSS 10 THEN BEGIN A:=A|10+CHA;GO TO RP END; 00034300
IF A=0 THEN SYNT("IL STMT"); 00034400
NUMB:=A END; 00034500
COMMENT 00034600
--- ARITH(1) CONVERTS EXPNS TO REVERSE POLISH ; 00034700
00034800
PROCEDURE ARITH(TT);VALUE TT;INTEGER TT; 00034900
BEGIN INTEGER I,A,B,C,J,K,OP,STCK;BOOLEAN INMOK,VOK,STROK; 00035000
LABEL S,SS,RPT,EXPON,DONE,FINEV,FORM1,FORM2,FORM3,FIN,RP; 00035100
INTEGER ARRAY OPK[1:20]; 00035200
00035300
COMMENT AN EXPRESSION CONSISTS OF A NUMBER OF PRIMARIES 00035400
SEPARATED BY OPERATORS, POSSIBLY PRECEDED BY INITIAL - . 00035500
PRIMARIES: OPERATORS: 00035600
NUMBER + 00035700
VARIABLE - 00035800
ARRAY WITH SUBSCRIPT(S) * 00035900
FUNCTION WITH PARAMETER(S) / 00036000
STRING ** 00036100
STRING VARIABLE = 00036200
STRING ARRAY WITH SUBSCRIPT 00036300
EXPRESSION IN BRACKETS 00036400
00036500
EXPRESSION HAS TYPE REAL UNLESS STRING PRIMARY 00036600
OCCURS: IF SO IT HAS TYPE STRING. A VARIABLE PRIMARY IS 00036700
A PRIMARY OTHER THAN NUMBER, FUNCTION, OR STRING. 00036800
IN OBJ AN EXPRESSION HAS FORM 00036900
A OPS A OPS ... A OPS 0 00037000
WHERE A IS A CHARACTER BETWEEN 1 AND 16 GIVING THE PRIMARY 00037100
OR OPERATOR TYPE. OPS IS 0-2 CHARACTERS GIVING MORE INFORMATION00037200
DEPENDING ON A. ; 00037300
00037400
STRIN:=FALSE;NDEP:=NDEP+1;IF NDEP=10 THEN SYNT("SIMPLFY"); 00037500
STCK:=OP:=0;INMOK:=VOK:=TRUE;STROK:=TT=0; 00037600
00037700
COMMENT PRIMARIES: ; 00037800
00037900
SS: CHA:=NWC; 00038000
COMMENT BRACKETED EXPRESSION; 00038100
S: ON(29) BEGIN ARITH(1);IF CHA NEQ 45 THEN SYNT("NO ) ,A"); 00038200
RED;GO TO FORM1 END; 00038300
COMMENT 1 NUMBER ; 00038400
IF CHA LSS 10 OR CHA = 26 THEN BEGIN R:=I:=0; 00038500
RPT: ON(26) BEGIN I:=1;CHA:=NWC END; 00038600
IF CHA GEQ 10 THEN GO TO EXPON;IF I>0 THEN BEGIN R:=R+CHA|10*(-I); 00038700
I:=I+1 END ELSE R:=R|10+CHA;CHA:=NWC; GO TO RPT; 00038800
EXPON: IF CHA NEQ 21 THEN GO TO DONE;I:=1;CHA:=NWC;J:=0; 00038900
ON(44) BEGIN I:=-1;CHA:=NWC END ELSE ON(16) CHA:=NWC;J:=CHA; 00039000
IF CHA GEQ 10 THEN SYNT("NO EXPN");CHA:=NWC; 00039100
IF CHA LSS 10 THEN BEGIN J:=J|10+CHA;CHA:=NWC END;R:=R|10*(I|J); 00039200
DONE: PUT(1);NCON:=NCON+1;CONST[NCON]:=R; 00039300
PUT(NCON.[11:6]);PUT(NCON.[5:6]);GO FORM2 END; 00039400
COMMENT 8 INITIAL - ; 00039500
ON(44) BEGIN IF NOT INMOK THEN SYNT ("MISPL -");PUT(8); 00039600
GO TO FORM2 END; 00039700
COMMENT 16 STRING ; 00039800
ON(63) BEGIN IF NOT STROK THEN SYNT("ILL STR");PUT(16); 00039900
SCAN CPR:APR:=POINTER(PROG[CS,2])+CP WHILE NEQ 63;A:=DELTA(APR,CPR); 00040000
STRIN:=TRUE;IF A>14 THEN SYNT("LONGSTR");PUT(A);PUT(CP); 00040100
CP:=CP+A+1;CHA:=NWC;VAR:=FALSE;GO TO FORM3 END; 00040200
IF CHCONV(CHA)=0 THEN SYNT("ILL NUM"); 00040300
B:=CHA;A:=LOOK(2) MOD 64;IF CHCONV(A) NEQ 0 THEN BEGIN 00040400
A:=LOOK(3) MOD 4096;CHA:=B; 00040500
IF A NEQ "ST" AND A NEQ "TH" AND A NEQ"TO" AND A NEQ "GO" THEN 00040600
BEGIN LABEL EQL,FNQ,RDUM; 00040700
COMMENT 5 STANDARD FNS; 00040800
INTEGER B,AS,AP; 00040900
B:=LOOK(3);CP:=LP; 00041000
FOR A:=21 STEP 1 UNTIL 32 DO IF B=KEY[A] THEN GO TO EQL; 00041100
GO TO FNQ; 00041200
EQL: IF NWC NEQ 29 THEN SYNT("NO PARM");ARITH(1);RED; 00041300
PUT(5);PUT(A-2); 00041400
IF CHA NEQ 45 THEN SYNT("NO ) A");GO TO FORM1; 00041500
COMMENT 4 USER FNS ; 00041600
FNQ: K:=B DIV 64; IF K NEQ "FN" THEN SYNT("UNRC FN"); 00041700
B:=CHCONV(B MOD 64);IF SUB[B]=0 THEN SYNT("UNDC FN"); 00041800
IF NWC NEQ 29 THEN SYNT("NO PARM");A:=0; 00041900
RDUM: A:=A+1;ARITH(1);RED;ON(58) GO TO RDUM; 00042000
IF CHA NEQ 45 OR A NEQ SUB[B] THEN SYNT("PARAMTR"); 00042100
CHA:=NWC;PUT(4);PUT(B);GO TO FORM2 END END; 00042200
B:=CHCONV(B);IF B=0 THEN SYNT("INV VAR");CHA:=NWC; 00042300
COMMENT 3 ARRAY ; 00042400
ON(29) BEGIN IF ARR[B,1]=0 THEN SYNT("UNDC AR"); 00042500
ARITH(1);RED;ON(58) BEGIN IF ARR[B,2]=0 THEN SYNT("SUBSCPT"); 00042600
ARITH(1);RED END;IF CHA NEQ 45 THEN SYNT("SUBSCPT");STROK:=FALSE; 00042700
PUT(3);PUT(B);CHA:=NWC END 00042800
ELSE ON("$") BEGIN IF NOT STROK THEN SYNT("ILL STR"); 00042900
COMMENT 15 STRING ARRAY; 00043000
CHA:=NWC;ON(29)BEGIN IF STRAR[B,1]=0 THEN SYNT("UNDSTAR");ARITH(1); 00043100
RED; 00043200
IF CHA NEQ 45 THEN SYNT("NO ) ,5");PUT(15);CHA:=NWC END ELSE 00043300
PUT(14);PUT(B);STRIN:=TRUE;VAR:=VOK;GO TO FORM3 END 00043400
ELSE BEGIN PUT(2);PUT(B);IF CHA LSS 10 THEN BEGIN PUT(C:=CHA+1); 00043500
COMMENT 14 STRING VBLE 00043600
2 VARIABLE ; 00043700
CHA:=NCH END ELSE PUT(C:=0);IF STCK=0 THEN ADDR:=11|(B-1)+C; 00043800
STROK:=FALSE END;VAR:=VOK;GO TO FORM3; 00043900
FORM1: CHA:=NWC; 00044000
FORM2: STROK:=VAR:=FALSE;IF STRIN THEN SYNT("ILL STR"); 00044100
COMMENT 7-13 OPERATORS: 00044200
DANGER: REVERSE POLISH SECTION ; 00044300
FORM3: BEGIN LABEL RPT,TEST,BOP,XOP; 00044400
STCK:=STCK+1;INMOK:=FALSE; 00044500
RPT: I:=0;ON(16) I:=3 ELSE ON(44) I:=4 ELSE 00044600
ON(43) BEGIN IF NWC=43 THEN I:=7 ELSE BEGIN CP:=CP-1;I:=5 END; 00044700
END ELSE ON(49) I:=6 ELSE IF CHA=61 AND EQOK THEN BEGIN INMOK:=TRUE; 00044800
IF NOT VAR THEN SYNT("ILL ASN");I:=1 END;VOK:=I LEQ 1; 00044900
IF NOT VOK THEN BEGIN STROK:=FALSE;IF STRIN THEN SYNT("ILL STR") END; 00045000
TEST: IF OP=0 THEN GO TO BOP; IF OP LSS 0 00045100
THEN SYNT(" ARITH"); 00045200
J:=OPK[OP];IF I|J NEQ 1 AND (I+1) DIV 2 LEQ (J+1) DIV 2 THEN BEGIN 00045300
OP:=OP-1;GO TO XOP END; 00045400
BOP: IF I=0 THEN GO TO FIN;OP:=OP+1;OPK[OP]:=1;GO TO SS; 00045500
XOP: VAR:=FALSE;STCK:=STCK-1; 00045600
PUT(J+6);IF STCK LEQ 0 THEN SYNT(" ARITH"); 00045700
GO TO TEST END; 00045800
COMMENT 6 END EXPN ; 00045900
FIN: NDEP:=NDEP-1;IF STCK NEQ 1 THEN SYNT(" ARITH"); 00046000
PUT(0) END; 00046100
COMMENT 00046200
--- SKIP SKIPS GIVEN STRING IF FOUND ; 00046300
00046400
PROCEDURE SKIP(A,B);VALUE A,B;INTEGER A,B; 00046500
BEGIN INTEGER C,D,E;E:=CP;C:=NWC; 00046600
FOR D:=1 STEP 1 UNTIL A-1 DO IF CHA NEQ "%" THEN C:=C|64+NWC; 00046700
IF C NEQ B THEN BEGIN CP:=E;CHA:=0 END END; 00046800
COMMENT 00046900
--- CHMAT CHECK USED IN MAT STATEMENT ; 00047000
00047100
INTEGER PROCEDURE CHMAT(A);VALUE A;INTEGER A; 00047200
BEGIN A:=CHCONV(A);IF A=0 THEN SYNT("ILL ARR"); 00047300
IF ARR[A,1]=0 THEN SYNT("UNDC AR");IF ARR[A,2]=0 THEN 00047400
SYNT(" TYPE");CHMAT:=A END; 00047500
00047600
00047700
COMMENT ---- CFN FOR FILE INPUT ANO OUTPUT; 00047800
00047900
PROCEDURE CFN; 00048000
BEGIN LABEL L,M; 00048100
CHA:=NWC;IF LOOK(4)="FILE" THEN BEGIN CP:=LP;D:=IF A=15 THEN 5 ELSE A; 00048200
FOR C:=1 STEP 1 UNTIL NF DO BEGIN CHA:=NWC;B:=LOOK(FNM[2,C]); 00048300
IF B=FNM[1,C] THEN BEGIN IF FNM[3,C]=0 THEN FNM[3,C]:=D ELSE IF D NEQ 00048400
FNM[3,C] THEN SYNT("IN+OUT?");CP:=LP;PUT(A);IF D=5 THEN 00048500
INFILTOG:=TRUE;IF A=7 THEN OUTFILTOG:=TRUE; 00048600
IF NWC=":" THEN BEGIN A:=NUMB;FOR B:=ACS STEP 1 UNTIL MS DO 00048700
IF A=SSEQ[B] THEN BEGIN PUT(B.[11:6]);PUT(B.[5:6]);GO ON(58) L ELSE M 00048800
END;SYNT("UNDF GO") END;PUT(0);PUT(0);ON(58) GO L; 00048900
GO TO M END ELSE BEGIN CP:=CP-1;CHA:=0 END END;SYNT("UNDC FL") END; 00049000
PUT(0);ON("%") GO TO M;CP:=CP-1;CHA:=0;GO TO L; 00049100
M: IF A=5 THEN SYNT("NOINPUT");PUT(0);GO TO INCST; 00049200
L: END; 00049300
00049400
COMMENT------------------------------------------------------- 00049500
----------- XBASIC STARTS HERE ----------------- 00049600
-------------------------------------------------------------; 00049700
00049800
FIRSTOFF:=IU NEQ 2;IF IU=2 THEN TTY.TYPE:=1; 00049900
PIBE:=POINTER(IOBE[1])+7; PINB:=POINTER(IOB[1]); 00050000
DELIM:=72;TIM:=10800;LL:=-1; 00050100
OBJECT:=HDDR:=FALSE;OU:=0; 00050200
00050300
FILL KEY[*] WITH "LET","GOT","GOS","RET","INP", 00050400
"REA","PRI","FOR","NEX","MAT","DEF","DAT", 00050500
"RAN","PAG","RES","REM","STO","END","IF ","ON ","SIN","COS", 00050600
"TAN","ATN","EXP","LOG","ABS","INT","SQR","FIX","SGN","RND", 00050700
"EQ","LT","LE","GT","GE","NE"; 00050800
00050900
COMMENT------------------------------------------------------ 00051000
------------SOURCEIN: FOR INPUT OF SOURCE PROGRAM ------- 00051100
------------ AND EXECUTION OF COMMANDS ------- 00051200
-----------------------------------------------------------------; 00051300
00051400
COMMENT: COMMANDS ALLOWED IN XBASIC 00051500
00051600
HELLO SAME AS BYE 00051700
BYE TERMINATES XBASIC. PRINTER OUTPUT IS SCHEDULED 00051800
RUN EXECUTES PROGRAM IF FREE OF SYNTAX ERRORS 00051900
SCR DELETES WORKFILE 00052000
DELETE SAME AS SCR 00052100
LIST LISTS ENTIRE WORKFILE 00052200
LIST E WHERE E IS A NUMBER OF ELEMENTS OF FORM 00052300
N OR M-N (M,N STATEMENT NUMBERS) 00052400
SEPARATED BY COMMAS. LISTS PART OF PROGRAM 00052500
MAKE NNNNNN INITIALISES AND NAMES WORKFILE 00052600
SAVE SAVES WORKFILE IF NAMED 00052700
SAVE NNNNNN SAVES WORKFILE IN NNNNNN. NAMES WORKFILE 00052800
IF NOT ALREADY NAMED 00052900
LOAD NNNNNN LOADS WORKFILE AND NAMES IT 00053000
LOAD NNNNNN/UUUUUUU COPIES WORKFILE FROM NNNNNN/UUUUUUU 00053100
WORKFILE BECOMES UNNAMED 00053200
COPY NNNNNN COPIES NNNNNN INTO WORKFILE 00053300
COPY NNNNNN/UUUUUUU SAME FOR NNNNNN/UUUUUUU 00053400
REMOVE NNNNNN REMOVES FILE NNNNNN/USER NO. 00053500
RENAME NNNNNN RENAMES WORKFILE 00053600
PLOP RESETS WORKFILE TO LAST RUN STATUS 00053700
WHATS OBTAINS WORKFILE STATUS 00053800
TTY INPUT UNIT IS TTY 00053900
VDU INPUT UNIT IS VDU 00054000
SEND DIVERTS OUTPUT TO PRINTER 00054100
NOSEND TERMINATES DIVERSION OF OUTPUT 00054200
TIME N RESETS MAX EXECUTION TIME TO N MINUTES 00054300
-------------------------------------------------------------; 00054400
00054500
SOURCEIN: BEGIN LABEL SOURCEIN,EF,COPY,NEWL,SOURCE,RMOB, 00054600
FST; 00054700
00054800
INTOVR:=INER; 00054900
IF FIRSTOFF THEN BEGIN FILECONTROL(5,"XBWKFL ",TIME(-1),FST); 00055000
FST: IF IU=0 THEN WRITE(TTY,INVIT);FIRSTOFF:=FALSE END; 00055100
IF LL=-1 THEN GO TO SOURCE; 00055200
SOURCEIN: IF IU GTR 0 THEN GO TO SOURCE;PINB:=PINB+80; 00055300
LL:=LL+1;IF LL LSS 24 THEN GO TO NEWL; 00055400
SOURCE: LL:=0;IF IU GTR 0 THEN READ(FN[IU-1][STOP],10,IOB[*]) 00055500
ELSE READ(VDU[STOP],240,IOB[*]); 00055600
IF IU=2 THEN WRITE(TTY,10,IOB[*]); 00055700
PINB:=POINTER(IOB[*]);IOBE[1]:=0; 00055800
NEWL: C:=IF MS>0 THEN SSEQ[MS] ELSE 0;APR:=PINB;BPR:=PIBE; 00055900
A:=NMBR(6);IF A=0 THEN BEGIN IF CHA="%" THEN GO TO SOURCEIN; 00056000
COMMENT NONVOID INPUT WITH ZERO STATEMENT NO. MUST BE COMMAND; 00056100
IOBE[1]:=0;REPLACE BPR-5 BY APR:CPR:=APR-1 FOR 1; 00056200
REPLACE BPR-4 BY APR:APR FOR 5 WHILE IN ALPHA;CHA:=IOBE[1]; 00056300
ON("RUN000") BEGIN IF OBJECT THEN BEGIN IF NMBR(72) NEQ 0 OR 00056400
CHA NEQ "%" THEN GO PER;GO EXECUTE END 00056500
ELSE IF IU=2 THEN GO COMPILE 00056600
ELSE BEGIN WRITE(TTY,WT); 00056700
FILECONTROL(4,"XBWKFL ",TIME(-1),COMPILE) END END; 00056800
ON("DELETE" OR CHA="SCR000") BEGIN C:=NMBR(72); 00056900
IF C NEQ 0 OR CHA NEQ "%" THEN GO PER;WRITE(TTY,F7); 00057000
CS:=MS:=IO[0]:=0;DANGER:=OBJECT:=FALSE;GO SOURCEIN END; 00057100
ON("LIST00") BEGIN 00057200
00057300
COMMENT PROCESS LIST COMMAND; 00057400
00057500
LABEL NEX,LEX; 00057600
IF OU=1 THEN WRITE(TTY,DVO); 00057700
WRITE(FL[OU],SPC); 00057800
NEX: BEG:=NMBR(72);IF CHCONV(CHA) NEQ 0 THEN GO PER; 00057900
EN:=ON("%" AND BEG=0) 1000000 ELSE ON(44) NMBR(72) ELSE BEG; 00058000
IF CHCONV(CHA) NEQ 0 THEN GO PER; 00058100
FOR A:=1 STEP 1 UNTIL MS DO IF SSEQ[A] LEQ EN 00058200
AND SSEQ[A] GEQ BEG THEN BEGIN 00058300
REPLACE POINTER(IOBE[1]) BY " " FOR 112; 00058400
WRITE(IOBE[*],NUM[2|OU],SSEQ[A]); 00058500
SCAN CPR:POINTER(IOBE[1])+20|OU FOR 20 WHILE NEQ 48; 00058600
REPLACE CPR BY POINTER(PROG[A,2]) FOR 72;WRITE(FL[OU],14,IOBE[*]) 00058700
END;ON(58) GO TO NEX;WRITE(TTY,STP,"LIST ");GO TO SOURCEIN END; 00058800
ON("RENAME") FILECONTROL(0," NAMED"," ",SOURCEIN); 00058900
ON("MAKE00") FILECONTROL(0,"CREATE","D",SOURCEIN); 00059000
ON("SAVE00") FILECONTROL(1," SAVED"," ",SOURCEIN); 00059100
00059200
ON("LOAD00") FILECONTROL(2," LOADE","D",SOURCEIN); 00059300
ON("REMOVE") FILECONTROL(3,"REMOVE","D",SOURCEIN); 00059400
ON("COPY00") FILECONTROL(2," COPIE",0,SOURCEIN); 00059500
ON("BYE000" OR CHA="HELL00") BEGIN IF IU=2 THEN GO FINSH; 00059600
FILECONTROL(6,"XBWKFL ",TIME(-1),FINSH) END; 00059700
ON("SEND00") BEGIN OU:=1;IF NOT HDDR THEN BEGIN 00059800
WRITE(LIN,HD3,TIME(6),TIME(5).[23:12],TIME(5).[35:12],TIME(5).[11:12], 00059900
TIME(-1).[41:18],TIME(-1).[23:24]); 00060000
HDDR:=TRUE END;WRITE(TTY,HD1);GO SOURCEIN END; 00060100
ON("NOSEND") BEGIN OU:=0;WRITE(TTY,STP,"NOSEND");GO TO SOURCEIN END; 00060200
ON("TTY000") BEGIN IU:=1;WRITE(TTY,STP,"SETTTY");GO TO SOURCE END; 00060300
ON("VDU000") BEGIN IU:=0;WRITE(TTY,STP,"SETVDU");GO TO SOURCEIN END; 00060400
ON("TIME00") BEGIN TIM:=3600|NMBR(10);WRITE(TTY,STP,"SETTIM"); 00060500
GO TO SOURCEIN END; 00060600
ON("PLOP00") FILECONTROL(5,0,0,SOURCEIN); 00060700
ON("WHATS0") BEGIN WRITE(TTY,F9);IF IO[0]=0 THEN 00060800
WRITE(TTY,F10,MS,SSEQ[MS]) ELSE 00060900
WRITE(TTY,F11,IO[0].[41:36],MS,SSEQ[MS]); 00061000
GO SOURCEIN END; 00061100
% ILLEGAL COMMAND 00061200
WRITE(TTY,WHT," "&CHA[35:35:6|DELTA(CPR,APR)]);GO SOURCEIN END; 00061300
00061400
COMMENT PROCESS SOURCE STATEMENT; 00061500
00061600
OBJECT:=FALSE;DANGER:=TRUE; 00061700
00061800
COMMENT DELETE STATEMENT; 00061900
00062000
ON("%") BEGIN CHA:=A;FOR A:=1 STEP 1 UNTIL MS DO 00062100
ON(SSEQ[A]) BEGIN MS:=MS-1;FOR B:=A STEP 1 UNTIL MS DO 00062200
BEGIN SSEQ[B]:=SSEQ[B+1];WRITE(PROG[B,*],10,PROG[B+1,*]) END END; 00062300
GO TO SOURCEIN END; 00062400
CHA:=A;APR:=APR-1; 00062500
00062600
COMMENT ADD NEW LAST STATEMENT; 00062700
00062800
IF CHA GTR C THEN BEGIN CS:=MS;MS:=A:=MS+1; 00062900
IF MS GTR 200 THEN GO TOOLONG; 00063000
GO TO COPY END; 00063100
00063200
COMMENT REPLACE EARLIER STATEMENT; 00063300
FOR A:=1 STEP 1 UNTIL MS DO ON(SSEQ[A]) GO TO COPY 00063400
ELSE IF CHA LSS SSEQ[A] THEN BEGIN MS:=MS+1; 00063500
00063600
COMMENT INSERT STATEMENT; 00063700
00063800
IF MS GTR 200 THEN GO TO TOOLONG; 00063900
FOR B:=MS STEP -1 UNTIL A+1 DO 00064000
BEGIN SSEQ[B]:=SSEQ[B-1];WRITE(PROG[B,*],10,PROG[B-1,*]) END; 00064100
GO TO COPY END; 00064200
COPY: PROG[A,11]:=SSEQ[A]:=CHA; 00064300
REPLACE BPR:CPR:=POINTER(PROG[A,2]) BY " " FOR 1; 00064400
B:=DELTA(APR,PINB+80);IF B>71 THEN B:=71; 00064500
REPLACE BPR:BPR BY APR FOR B WHILE NEQ "!"; 00064600
REPLACE BPR BY " " FOR 72-DELTA(CPR,BPR);GO SOURCEIN END SOURCEIN; 00064700
INER: WRITE(TTY,INTR);GO TO SOURCEIN; 00064800
TOOLONG: WRITE(TTY,LNGPRG,SSEQ[CS]);GO TO SOURCEIN; 00064900
PER: WRITE(TTY,F12);GO SOURCEIN; 00065000
COMMENT---------------------------------------------------------- 00065100
-------------------- END SOURCEIN --------------------------- 00065200
------------------------------------------------------------------ 00065300
----------- COMPILE: SEARCH FOR SYNTAX ERRORS --------- 00065400
----------- AND MAKE PSEUDO-OBJECT CODE --------- 00065500
--------------------------------------------------------------------; 00065600
COMMENT 00065700
SYNTAX ERROR MESSAGES: OUTPUT AFTER "RUN" 00065800
WITH NEW FAULTY PROGRAM 00065900
00066000
ARITH MISSING OPERATOR OR OPERAND IN ARITHMETIC 00066100
EXPRESSION (SHOULD NOT OCCUR) 00066200
FILES PROGRAM CAN HAVE ONLY ONE INPUT AND ONE OUTPUT 00066300
FILE 00066400
IL GOSB THIS STATEMENT HAS BEEN ILLEGALLY REFERENCED 00066500
BY A GOSUB STATEMENT (IT IS IN A FOR LOOP) 00066600
IL RELN AN ILLEGAL RELATION OF FORM X?? HAS BEEN 00066700
FOUND IN AN IF STATEMENT 00066800
ILL ARR ARRAY NAME EXPECTED BUT CHARACTER IS NOT 00066900
A LETTER 00067000
ILL ASN AN ASSIGNMENT IS ATTEMPTED BUT LEFT HAND SIDE 00067100
IS NOT A VARIABLE 00067200
ILL FN THE NAME OF A DEFINED FUNCTION MUST BE OF FORM 00067300
FN LETTER. PARAMETER(S) MUST BE SUPPLIED. 00067400
ILL FOR A FOR STATENENT IS ALREADY IN OPERATION 00067500
FOR THIS VARIABLE 00067600
ILL NEX NEXT MUST REFER TO AN UNSUBSCRIPTED REAL VBLE 00067700
ILL NUM A PRIMARY IS MISSING OR ILLEGAL 00067800
ILL STR A STRING PRIMARY HAS BEEN ENCOUNTERED IN 00067900
A REAL EXPRESSION 00068000
IL STMT ILLEGAL STATEMENT 00068100
INV IF STRINGS CAN ONLY BE COMPARED FOR EQUALITY 00068200
OR INEQUALITY 00068300
INV PAR A FORMAL PARAMETER IN A DEF STATEMENT 00068400
MUST BE A VARIABLE 00068500
INV VAR A PRIMARY IS MISSING OR ILLEGAL. IN A READ 00068600
STATEMENT EVERY EXPRESSION MUST CONSIST OF 00068700
A SINGLE VARIABLE PRIMARY. 00068800
IN+OUT? A FILE IS BEING USED FOR INPUT AND OUTPUT 00068900
LONGSTR A STRING CONTAINS MORE THAN 14 CHARACTERS 00069000
IN A STATEMENT OTHER THAN PRINT. 00069100
MISG OP AN OPERAND ESSENTIAL TO THIS STATEMENT HAS 00069200
BEEN OMITTED (END OF STATEMENT ERROR). 00069300
MISP = MISPLACED OR MISSING = IN DEF STATEMENT 00069400
MISPL - A - SIGN HAS BEEN PLACED ILLEGALLY IN AN 00069500
EXPRESSION (E.G. A*-B). 00069600
NAME PROBABLY CAUSED BY ILLEGAL FILENAME 00069700
NESTING INCORRECTLY NESTED FOR AND NEXT STATEMENTS 00069800
NO ) X MISSING PARENTHESES: X=A IN ARITH EXPRESSION 00069900
NO ( X P IN FUNCTION PARAMETER 00070000
S IN SUBSCRIPT 00070100
F IN FILE DECLARATION 00070200
NO EXPN E HAS BEEN FOUND IN A NUMBER BUT NO EXPONENT 00070300
FOLLOWS 00070400
NO FOR A NEXT STATEMENT HAS NO CORRESPONDING FOR 00070500
NOINPUT INPUT STATEMENT MUST HAVE LIST OF VARIABLES 00070600
NO NEXT A FOR STATEMENT EARLIER IN PROGRAM HAS NO NEXT 00070700
NO PARM EVERY FUNCTION MUST HAVE PARAMETER(S) IN 00070800
BRACKETS 00070900
NO PROG THERE IS NO PROGRAM TO RUN 00071000
NO RELN NO RELATION HAS BEEN FOUND IN AN IF STATEMENT 00071100
NO SEPR CONSECUTIVE ARITH EXPRESSIONS IN PRINT 00071200
STATEMENT MUST BE SEPARATED BY , OR SEMICOLON 00071300
NO TO A FOR STATEMENT MUST HAVE A FINAL VALUE 00071400
(FOR X=1 TO 10 ETC.) 00071500
NOT END THE LAST STATEMENT MUST BE AN END STATEMENT 00071600
NOTLAST THE END STATEMENT MUST BE THE LAST STATEMENT 00071700
OVERFLW A NUMBER IS TOO LARGE 00071800
QUOTES MISMATCHED STRING QUOTES 00071900
REDC AR ARRAY TWICE DIMENSIONED 00072000
REDC FN A FUNCTION HAS BEEN DEFINED MORE THAN ONCE 00072100
SAMEFIL A FILE HAS BEEN DECLARED MORE THAN ONCE 00072200
PARAMTR WRONG NUMBER OF PARAMETERS IN A FUNCTION CALL 00072300
SIMPLFY AN EXPRESSION IS NESTED TO A DEPTH OF 10 OR 00072400
MORE AND SHOULD RE BROKEN UP 00072500
SIZE AN ARRAY DIMENSION IS GREATER THAN 64 OR 00072600
(IN MAT STATEMENT) IS GREATER THAN THE DECLARED 00072700
DIMENSION OF THE ARRAY 00072800
STORAGE ARRAY STORAGE HAS BEEN EXCEEDED (700 WORDS OF 00072900
TYPE REAL, 70 OF TYPE ALPHA) 00073000
STR >63 ILLEGAL OBJECT CHARACTER (E.G. PRINT STRING 00073100
HAS >63 CHARS OR STARTS LATER THAN COL 63) 00073200
STR=STR A STRING CAN ONLY BE COMPARED WITH ANOTHER 00073300
SUBSCPT AN ARRAY REFERENCE HAS THE WRONG NUMBER OF 00073400
SUBSCRIPTS 00073500
TOO MCH PROCESSING OF THE SOURCE STATEMENT HAS NOT 00073600
USED UP ALL THE INFORMATION IN IT. (CAN BE 00073700
CAUSED BY OMISSION OF AN OPERATOR IN AN 00073800
EXPRESSION) 00073900
TYPE AN ATTEMPT HAS BEEN MADE TO USE A MAT STATEMENT 00074000
FOR A 1-DIMENSIONAL ARRAY 00074100
UNDC AR AN ARRAY HAS BEEN REFERENCED BUT NOT DECLARED 00074200
UNDC FL A FILE HAS BEEN REFERENCED BUT NOT DECLARED 00074300
UNDC FN A FUNCTION OF TYPE FN* HAS BEEN REFERENCED BUT 00074400
NOT DECLARED 00074500
UNDF GO THERE IS NO STATEMENT IN THE PROGRAM WITH THE 00074600
SEQUENCE NUMBER REFERENCED BY THIS STATEMENT 00074700
UNDSTAR A STRING ARRAY HAS BEEN REFERENCED BUT NOT 00074800
DECLARED 00074900
UNRC FN A FUNCTION NAME OR KEYWORD HAS BEEN MISSPELLED 00075000
OR MISPLACED 00075100
3 FILES NOT MORE THAN TWO FILES MAY BE DECLARED 00075200
11 FORS FOR STATEMENTS NESTED TOO DEEP 00075300
:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::; 00075400
00075500
COMPILE: 00075600
00075700
COMMENT IN THE FOLLOWING COMMENTS, 00075800
<E> IS ANY EXPRESSION (POSSIBLY WITH =) 00075900
<L> IS ANY LETTER 00076000
<V> IS ANY VARIABLE PRIMARY 00076100
<N> IS ANY UNSIGNED INTEGER 00076200
<S> IS A STATEMENT NUMBER 00076300
<F> IS A FILENAME 00076350
00076400
ALLOWED VARIANTS ARE LISTED BELOW. THREE LETTER 00076500
ABBREVIATIONS OF INITIAL KEYWORDS ARE ALLOWED WHERE UNAMBIGUOUS.00076600
SPACES ARE IGNORED EXCEPT INSIDE STRING QUOTES; 00076700
00076800
INTOVR:=INTVR;INDEX:=QUOTE;FLAG:=FLAGR; 00076900
MSTO:=287;MSTR:=27;INFILTOG:=OUTFILTOG:=FALSE; 00077000
FOR A:=1 STEP 1 UNTIL 26 DO STRAR[A,1]:=ARR[A,1]:=ARR[A,2]:=SUB[A]:=0; 00077100
IO[1]:=IO[2]:=FNM[2,1]:=FNM[2,2]:=FNM[3,1]:=FNM[3,2]:=AREASIZE:=0; 00077200
NDEP:=CO:=1;POB:=POINTER(OBJ[*]); 00077300
CS:=0;SY:=EQOK:=TRUE; 00077400
IF MS =0 THEN SYNT("NO PROG"); 00077500
FORE:=FORC:=NCON:=0;FOR A:=1 STEP 1 UNTIL 200 DO STYP[A]:=0; 00077600
00077700
COMMENT FILES 00077800
<N> FILES <D>,.. 00077900
WHERE <D> IS <F> (EXISTING FILE) 00078000
OR <F>(<N>) (FILE TO BE CREATED: N=MAX NO OF RECS) 00078100
WHERE <F> IS A CANDE FILENAME 00078200
THERE CAN ONLY BE ONE FILES STATEMENT. IT MUST BE THE FIRST STATEMENT. 00078300
THERE CAN BE AT MOST ONE INPUT FILE AND ONE OUTPUT FILE; 00078400
00078500
FIL: ACS:=CS:=CS+1;CP:=CHA:=0;CHA:=NWC;B:=LOOK(3); 00078600
IF B="REM" THEN GO FIL;IF B="FIL" THEN BEGIN CP:=LP;SKIP(2,"ES");A:=0; 00078700
RFIL: A:=A+1;IF A>3 THEN SYNT("3 FILES"); 00078800
CHA:=NWC;IO[A]:=" ";BPR:=POINTER(PROG[CS,2])+CP-1; 00078900
SCAN APR:BPR FOR 6 WHILE IN ALPHA;FNM[2,A]:=B:=DELTA(BPR,APR); 00079000
REPLACE POINTER(IO[A])+1 BY BPR FOR B;FNM[1,A]:=LOOK(B);CP:=LP; 00079100
NF:=A;CHA:=NWC;ON("(") BEGIN AREASIZE:=NUMB/20+1;FNM[3,A]:=7; 00079200
IF CHA NEQ ")" THEN SYNT("NO ) ,F");CHA:=NWC END;ON(",") GO TO RFIL; 00079300
IF A=2 AND IO[1]=IO[2] THEN SYNT("SAMEFIL");IF CHA NEQ "%" THEN 00079400
SYNT("TOO MCH") END ELSE CS:=0; 00079500
IF ACS>MS THEN SYNT("NO PROG"); 00079600
COMMENT DIM 00079700
<N> DIM <M>(<S>),... 00079800
<N> DIMENSION <M>(<T>),... 00079900
WHERE <M> IS <L> OR <L>$ 00080000
<T> IS <N> OR <N>,<N> 00080100
DIM STATEMENTS MUST PRECEDE ALL EXECUTABLE STATEMENTS 00080200
STRING ARRAY MUST BE ONE-DIMENSIONAL. 00080300
ALL DIMENSIONS MUST BE <64. 00080400
713 WORDS REAL AND 73 STRINGS ARE AVAILABLE FOR ARRAYS ; 00080500
00080600
DIM: ACS:=CS:=CS+1;CP:=CHA:=0;CHA:=NWC; 00080700
B:=LOOK(3);IF B="REM" THEN GO DIM; 00080800
IF B="DIM" THEN BEGIN CP:=LP;SKIP(6,"ENSION"); 00080900
RDIM: K:=CHCONV(NWC);IF K=0 THEN SYNT("ILL ARR"); 00081000
IF NWC="$" THEN BEGIN STRAR[K,0]:=MSTR;IF NWC NEQ "(" THEN 00081100
SYNT("NO ( ,S");A:=STRAR[K,1]:=NUMB;MSTR:=MSTR+A; 00081200
IF CHA NEQ ")" THEN SYNT("NO ) ,S");IF NWC="," THEN GO TO RDIM; 00081300
GO TO DIM END; ARR[K,0]:=MSTO;IF CHA NEQ "(" THEN SYNT("NO ( ,S"); 00081400
IF ARR[K,1] NEQ 0 THEN SYNT("REDC AR"); 00081500
B:=ARR[K,1]:=NUMB;IF B>64 THEN SYNT(" SIZE "); 00081600
ON(",") BEGIN A:=ARR[K,2]:=NUMB;B:=B|A END; 00081700
MSTO:=MSTO+B;IF MSTO GTR 1000 THEN SYNT("STORAGE"); 00081800
IF CHA NEQ ")" THEN SYNT("NO ) ,S");IF NWC="," THEN GO TO RDIM; 00081900
GO TO DIM END;IF ACS>MS THEN SYNT("NO PROG"); 00082000
00082100
COMMENT PROGRAM COMPILATION BEGINS HERE ; 00082200
00082300
FOR CS:=ACS STEP 1 UNTIL MS DO BEGIN 00082400
COMMENT IF GOSUB ENTRY THEN FIX FOR LEVEL ; 00082500
EXS: IF STYP[CS] NEQ 0 THEN BEGIN IF FORC NEQ FORE THEN 00082600
SYNT("IL GOSB");FORE:=FORC:=STYP[CS] END; 00082700
COMMENT IDENTITY STATEMENT TYPE ; 00082800
NDEP:=CP:=CHA:=0;CHA:=NWC;B:=LOOK(3);EQOK:=TRUE; 00082900
FOR A:=1 STEP 1 UNTIL 18 DO IF B=KEY[A] THEN GO TO EQL; 00083000
IF B="DIM" OR B="FIL" THEN BEGIN WRITE(TTY,F6,SSEQ[CS]); 00083100
GO SOURCEIN END; 00083200
%IF B="TRA" THEN BEGIN STYP[CS]:=20;GO REM END; 00083300
%IF B="UNT" THEN BEGIN STYP[CS]:=21;GO REM END; 00083400
B:=B DIV 64; 00083500
IF B="IF" THEN BEGIN LP:=LP-1;A:=19;GO TO EQL END; 00083600
IF B="ON" THEN BEGIN LP:=LP-1;A:=20;GO TO EQL END; 00083700
LP:=0;A:=1; 00083800
EQL: CP:=LP;STYP[CS]:=A;SPOB[CS]:=CO; 00083900
IF CS=MS AND A NEQ 18 THEN SYNT("NOT END");GO TO OPN[A]; 00084000
COMMENT 1 LET 00084100
<N> LET <E> 00084200
<N> <E> 00084300
WHERE E MAY BE A STRING ASSIGNMENT ; 00084400
00084500
LET: ARITH(0);GO TO INCST; 00084600
CAR: ARITH(1); GO TO INCST; 00084700
COMMENT 20 ON 00084800
<N> ON <E> GO TO <S>,... ; 00084900
00085000
ONX: ARITH(1);SKIP(3,"OTO"); 00085100
RON: A:=NUMB;FOR B:=ACS STEP 1 UNTIL MS DO IF A=SSEQ[B] 00085200
THEN BEGIN PUT(B.[11:6]);PUT(B.[5:6]); 00085300
IF STYP[CS]=3 AND STYP[B]<FORC THEN STYP[B]:=FORC ELSE 00085400
COMMENT SEE FOR STATEMENT FOR THIS TRICK; 00085500
IF STYP[CS]=20 THEN BEGIN ON(58) GO RON ELSE BEGIN PUT(0);PUT(0) 00085600
END END;GO INCST END;SYNT("UNDF GO"); 00085700
COMMENT 19 IF 00085800
<N> IF <X><R><E> THEN <S> 00085900
<N> IF <X><R><E> GO TO <S> 00086000
<X> IS AN EXPRESSION WITHOUT = 00086100
<R> IS ONE OF THE FOLLOWING 00086200
|EQ |GT |LT |GE |LE |NE 00086300
= > < >= <= <> 00086400
STRINGS CAN BE COMPARED ONLY FOR EQUALITY OR INEQUALITY; 00086500
00086600
IFF: EQOK:=FALSE;ARITH(0);EQOK:=TRUE; 00086700
C:=IF STRIN THEN 0 ELSE 1; 00086800
B:=0;IF CHA=30 THEN BEGIN B:=B+2;CHA:=NWC END; 00086900
IF CHA=14 THEN BEGIN B:=B+4;CHA:=NWC END;IF CHA=61 THEN B:=B+1 00087000
ELSE CP:=CP-1;IF B=0 THEN CHA:=NWC ELSE GO TO FEQ; 00087100
IF CHA NEQ "|" THEN SYNT("NO RELN");CHA:=NWC; 00087200
A:=CHA|64+NWC;FOR B:=1 STEP 1 UNTIL 6 DO IF A=KEY[B+32] 00087300
THEN GO TO FEQ;SYNT("IL RELN"); 00087400
FEQ: PUT(B);ARITH(C);IF C=0 AND NOT STRIN THEN SYNT("STR=STR"); 00087500
IF STRIN AND B NEQ 1 AND B NEQ 6 THEN SYNT("INV IF "); 00087600
SKIP(3,"OTO");SKIP(3,"HEN");GO TO RON; 00087700
COMMENT 2 GO TO 00087800
<N> GO TO <S> ; 00087900
00088000
GOT: SKIP(1,"O");GO TO RON; 00088100
COMMENT 3 GOSUB 00088200
<N> GOSUB <S> ; 00088300
00088400
GOS: SKIP(2,"UB");GO TO RON; 00088500
COMMENT 4 RETURN 00088600
<N> RETURN ; 00088700
00088800
RET: SKIP(3,"URN");CHA:=NWC;GO TO INCST; 00088900
COMMENT 8 FOR 00089000
<N> FOR <E> TO <E> STEP <E> 00089100
<N> FOR <E> TO <E> ; 00089200
00089300
COMMENT DURING COMPILE, FOR INFO IS STORED IN FORX AS FOLLOWS: 00089400
2 3 4 00089500
OBJPOINTER TO STORE NEXTLINE FORLINE ADDR 00089600
00089700
EACH FOR IS ASSIGNED A LEVEL (=FORC), WHICH 1S USED TO CHECK 00089800
NESTING AND DURING EXECUTION. IN SUBROUTINES FORC IS INITIALISED 00089900
TO MAX FORC OF CALLING (GOSUB) STATEMENT: THIS LEVEL 1S STORED 00090000
TEMPORARILY IN STYP. OBJECT FORM OF FOR STATEMENT IS AS FOLLOWS: 00090100
LEVEL ASSIGN FINAL INCREMENT NEXTLINE ; 00090200
00090300
FOX: FORC:=FORC+1;PUT(FORC);IF FORC>10 THEN SYNT("11 FORS"); 00090400
ARITH(1);FORX[FORC,4]:=ADDR+1;IF CHA NEQ "T" THEN SYNT(" NO TO"); 00090500
SKIP(1,"O");FOR A:=1 STEP 1 UNTIL FORC-1 DO IF FORX[A,4]=ADDR THEN 00090600
SYNT("ILL FOR");ARITH(1);IF CHA="S" THEN BEGIN SKIP(3,"TEP");ARITH(1) 00090700
END ELSE PUT(0);FORX[FORC,2]:=CO;PUT(0);PUT(0);FORX[FORC,3]:=CS; 00090800
GO INCST; 00090900
COMMENT 9 NEXT 00091000
<N> NEXT <V> 00091100
WHERE <V> IS A VARIABLE NAME ; 00091200
00091300
NEX: SKIP(1,"T");B:=CHCONV(NWC)-1;IF B=-1 THEN SYNT("ILL NEX"); 00091400
IF NWC LSS 10 THEN BEGIN B:=11|B+CHA+1;CHA:=NWC END ELSE B:=11|B; 00091500
IF FORC=FORE THEN SYNT("NO FOR "); 00091600
IF B+1 NEQ FORX[FORC,4] THEN SYNT("NESTING"); 00091700
A:=CO;CO:=FORX[FORC,2];PUT(CS.[11:6]);PUT(CS.[5:6]); 00091800
CO:=A;SPOB[CS]:=FORC+16|FORX[FORC,3];FORX[FORC,4]:=0;FORC:=FORC-1; 00091900
GO INCST; 00092000
COMMENT 11 DEF 00092100
<N> DEF FN<L>(<L>....)=<E> 00092200
FORMAL PARAMETERS MUST BE SINGLE LETTERS ; 00092300
00092400
DEF: SKIP(3,"INE");SKIP(2,"FN");K:=CHCONV(NWC); 00092500
IF K=0 OR NWC NEQ 29 THEN SYNT(" ILL FN");A:=0;PUT(K); 00092600
IF SUB[K] NEQ 0 THEN SYNT("REDC FN"); 00092700
RDUM: A:=A+1;B:=11|CHCONV(NWC)-11;IF B=-11 THEN SYNT("INV PAR"); 00092800
CONST[NCON+A]:=B;IF NWC=58 THEN GO RDUM;IF CHA NEQ 45 THEN SYNT 00092900
(" NO ) P");SUB[K]:=A;FOR B:=A STEP -1 UNTIL 1 DO BEGIN 00093000
PUT((C:=CONST[NCON+B]).[11:6]);PUT(C.[5:6]) END; 00093100
IF NWC NEQ "=" THEN SYNT("MISP = ");ARITH(1);SUB[K]:=A;GO TO INCST; 00093200
COMMENT 6 READ 00093300
<N> READ <V>,... ; 00093400
00093500
REA: SKIP(1,"D"); 00093600
RREA: ARITH(0);IF NOT VAR THEN SYNT("INV VAR"); 00093700
ON(58) GO TO RREA;PUT(0);GO TO INCST; 00093800
COMMENT 5 INPUT 00093900
<N> INPUT <V>,... 00094000
<N> INPUT FILE <F>,<V>,... 00094100
WHERE <F> IS THE FILENAME; 00094200
INP: SKIP(2,"UT");CFN;GO TO RREA; 00094300
COMMENT 13 RANDOMISE 00094400
<N> RANDOMISE 00094500
<N> RANDOMIZE ; 00094600
RAN: SKIP(6,"DOMISE");SKIP(6,"DOMIZE");CHA:=NWC;GO TO INCST; 00094700
COMMENT 15 RESTORE 00094800
<N> RESTORE 00094900
<N> RESTORE FILE <F> 00094930
WHERE <F> IS THE INPUT FILE ; 00094960
RES: SKIP(4,"TORE");CFN; GO TO INCST; 00095000
COMMENT 7 PRINT 00095100
<N> PRINT <P> 00095200
<N> PRINT FILE <F>,<Q>,... 00095300
WHERE <F> IS A FILENAME 00095400
WHERE <P> IS A NUMBER OF ELEMENTS OF FORM 00095500
"<Z>" 4 00095600
<E>, 2 OR 6, 1 00095700
<E>; COMMENT 2 OR 6 00095800
, 1 (1,5 IF TRAILS00095900
; COMMENT 5 IF TRAILS 00096000
TAB(<E>) 3 00096100
WHERE <Z> IS ANY STRING 00096200
WHERE <Q> IS "<Z>" OR <E> ; 00096300
00096400
PRI: SKIP(2,"NT");CFN;CHA:=NWC;AA:=FALSE; 00096500
RPRI: ON("%") BEGIN PUT(0);GO TO INCST END; 00096600
ON(58) BEGIN PUT(1);AA:=FALSE; 00096700
IF NWC="%" THEN BEGIN PUT(5); GO TO INCST END 00096800
ELSE GO TO RPRI END; 00096900
ON(";" OR CHA=":") BEGIN AA:=FALSE;IF NWC="%" THEN BEGIN PUT(5); 00097000
GO INCST END;GO TO RPRI END; 00097100
ON(63) BEGIN AA:=FALSE;PUT(4);PUT(CP);CPR:=POINTER(PROG[CS,2])+CP; 00097200
SCAN APR:CPR UNTIL=63;B:=DELTA(CPR,APR);PUT(B); 00097300
CP:=CP+B+1;CHA:=NWC;GO TO RPRI END; 00097400
IF LOOK(4)="TAB(" THEN BEGIN AA:=FALSE;PUT(3);CP:=LP;ARITH(1); 00097500
IF CHA NEQ 45 THEN SYNT("NO ) P");CHA:=NWC;GO TO RPRI END; 00097600
CP:=CP-1;IF AA THEN SYNT("NO SEPR");AA:=TRUE; 00097700
B:=CO;PUT(2);ARITH(0);IF STRIN THEN 00097800
REPLACE POB+B BY "6" FOR 1;GO TO RPRI; 00097900
COMMENT 14 PAGE 00098000
<N> PAGE ; 00098100
PAG: SKIP(1,"E");CHA:=NWC;GO TO INCST; 00098200
COMMENT 10 MAT 00098300
<N> MAT READ <L> 1 00098400
<N> MAT READ <L>(<N>,<N>) 1 00098500
<N> MAT PRINT <L> 2 00098600
<N> MAT PRINT <L>(<N>,<N>) 2 00098700
<N> MAT LET <L>=(<E>)*<L> 4 00098800
<N> MAT <L>=(<E>)*<L> 4 00098900
<N> MAT LET <L>=<M> 3 00099000
<N> MAT <L>=<M> 3 00099100
WHERE <M> IS AS DESCRIBED IN EXECUTE(PROCEDURE MATOP) ; 00099200
MAT: CHA:=NWC;A:=LOOK(4);IF A="READ" THEN BEGIN PUT(1);CP:=LP; 00099300
GO TO IOMT END;IF A="PRIN" THEN BEGIN PUT(2);CP:=LP;SKIP(1,"T"); 00099400
GO TO IOMT END;CP:=CP-1;SKIP(3,"LET");A:=CP;B:=CHMAT(NWC);CHA:=NWC; 00099500
IF NWC=29 THEN BEGIN PUT(4);PUT(B);ARITH(1);CHA:=NWC;PUT(CHMAT(NWC)); 00099600
END ELSE BEGIN PUT(3);PUT(A) END;GO TO REM; 00099700
IOMT: K:=CHMAT(NWC);PUT(K);IF NWC=29 THEN BEGIN 00099800
FOR B:=1,2 DO BEGIN A:=NUMB;IF A LSS 0 OR A GTR ARR[K,B] THEN 00099900
SYNT(" SIZE");PUT(A) END;CHA:=NWC; 00100000
END ELSE BEGIN PUT(ARR[K,1]);PUT(ARR[K,2]) END; 00100100
PUT(ON(";") 1 ELSE 0);ON(";") CHA:=NWC;GO TO INCST; 00100200
COMMENT 12 DATA 00100300
<N> DATA <E>,... ; 00100400
DAT: SKIP(1,"A"); 00100500
RDAT: ARITH(0);ON(58) GO TO RDAT;PUT(0);GO INCST; 00100600
COMMENT 17 STOP 00100700
<N> STOP 00100800
18 END 00100900
<N> END ; 00101000
ENX: IF CS NEQ MS AND A=18 THEN SYNT("NOTLAST");CHA:=NWC; 00101100
IF A=17 THEN CHA:=NWC; 00101200
INCST: IF CHA NEQ "%" THEN SYNT("TOO MCH"); 00101300
COMMENT 16 REM 00101400
<N> REM <Z> 00101500
WHERE <Z> IS ANYTHING ; 00101600
REM:ERR: END; 00101700
00101800
% SORT OUT FILES IF 2 TO BE USED 00101900
CS:=MS;IF NF=2 AND FNM[3,1]=FNM[3,2] THEN SYNT(" FILES "); 00102000
IF FNM[3,1]=7 THEN BEGIN IO[3]:=IO[1];IO[1]:=IO[2]; 00102100
IO[2]:=IO[3] END; 00102200
IF NOT SY THEN BEGIN WRITE(TTY,STP,"ERRORS");GO TO SOURCEIN END; 00102300
OBJECT:=TRUE;GO TO EXECUTE; 00102400
00102500
INTVR: SYNT("OVERFLW"); QUOTE: SYNT(" QUOTES"); 00102600
FLAGR: SYNT("NAME "); 00102700
00102800
00102900
COMMENT----------------------------------------------------------------00103000
-------------- END COMPILE ------------------------00103100
------------------------------------------------------------------------00103200
-------------- EXECUTE: EXECUTION OF --------------------00103300
-------------- USERS PROGRAM --------------------00103400
-----------------------------------------------------------------------;00103500
EXECUTE: BEGIN 00103600
00103700
FILE IN FIL1 DISK " "(2,10,300); 00103800
FILE OUT FIL2 DISK[20:AREASIZE] " "(2,10,300,SAVE 7); 00103900
00104000
INTEGER ARRAY SVE[1:10], % HOLDS GOSUB CALLS 00104100
FUNC[1:26], % DEFINES 00104200
STRGS[-1:100,0:2], % STRINGS 00104300
IOB[1:14], % I/O PSEUDOBUFFER 00104400
IOF[1:10], % " 00104500
ADR[0:20]; % ADDRESS STCK FOR EVAL 00104600
00104700
ARRAY STORE[0:1000], % HOLDS VARIABLE VALUES ETC 00104800
STK[0:20]; % VALUE STACK FOR EVAL 00104900
00105000
INTEGER XRND, % PSEUDO-RANDOM NUMBER INDEX 00105100
CO, % CURRENT POSITION IN OBJ[*] 00105200
RDAT, % DATA STATEMENT 00105300
NGOT, % GO COUNTER 00105400
SLVE, % GOSUB COUNTER 00105500
RDTP, % POSITION IN DATA STATEMENT 00105600
MSTO, % TOP OF STORE[*] 00105700
MSTR, % TOP OF STRGS[*, ] 00105800
IR, % INPUT FILE SEQUENCE NO 00105850
NR, % OUTPUT FILE COUNTER 00105900
RT, % RUN TERMINATION TIME 00106000
MF, % FILE (0=TTY,OTHERWISE DISK) 00106100
STCK, % STACK POINTER FOR EVAL 00106200
A,B,C,D,I,J,K,L,U,V,W,X,Y,Z,AS; 00106300
00106400
REAL R,S,T; % HASH 00106500
00106600
POINTER PIOB, % CURRENT POSITION IN IOB[*] 00106700
POUB, % INITIAL 00106800
PBR,IPR; 00106900
00107000
LABEL INCST; 00107100
00107200
% TRACE PACKAGE 00107300
%FORMAT T1(I6,X2,A3,X5,"VALUE ASSIGNED= "U),T2(I6,X2,A3,X5," TO STMT " 00107400
% ,I6),T3(I6,X2,A3); 00107500
BOOLEAN TRACEON,TLIN;%POINTER ITR; 00107600
%PROCEDURE DSTR(A);VALUE A;INTEGER A; 00107700
%BEGIN WRITE(IOF[*],T3,SSEQ[CS],IF TLIN THEN KEY[STYP[CS]] ELSE " "); 00107800
%REPLACE ITR:POINTER(IOF[*])+14 BY "STRING ASSIGNED=";REPLACE ITR:ITR 00107900
%BY """ FOR 1;REPLACE ITR:ITR BY POINTER(STRGS[A,1]) FOR STRGS[A,0]; 00108000
%REPLACE ITR BY """ FOR 1;WRITE(FL[OU],9,IOF[*]);TLIN:=FALSE END; 00108100
DEFINE TR0(TR01,TR02)=#,%IF TR01 THEN BEGIN WRITE(FL[OU],TR02,SSEQ[CS],00108200
% IF TLIN THEN KEY[STYP[CS]] ELSE " "#, 00108300
TR1(TR11)=#, %=TR0(TRACEON,T1),TR11);TLIN:=FALSE END#, 00108400
TR2(TR21)=#, %=TR0(TRACEON,T2),SSEQ[TR21]);TLIN:=FALSE END#, 00108500
TR3 =#, %=TR0(TLIN,T3));TLIN:=FALSE END#, 00108600
TR4(TR41)=#; %=IF TRACEON THEN DSTR(TR41)#; 00108700
00108800
% PROCEDURES FOR EXECUTE: 00108900
00109000
COMMENT 00109100
--- GET GETS NEXT CHARACTER FROM OBJ ; 00109200
00109300
DEFINE GET=0&OBJ[CO.[46:44]][5:47-CO.[2:3]|6:6];CO:=CO+1; 00109400
IF CO.[2:3]=0 THEN CO:=CO+1#; 00109500
COMMENT 00109600
--- ERROR DEALS WITH EXECUTION TIME ERRORS; 00109700
00109800
PROCEDURE ERROR(A);VALUE A;INTEGER A; 00109900
BEGIN SWITCH FORMAT ERR:=("ERR0",I6), % SHOULD NOT OCCUR.. %0 00110000
("SUBSCRIPT OUT OF BOUNDS AT LINE ",I6), %1 00110100
("LOG OF NEGATIVE OR ZERO NUMBER AT LINE ",I6), %2 00110200
("SQR OF NEGATIVE NUMBER AT LINE ",I6), %3 00110300
("UNDEFINED FUNCTION AT LINE ",I6), %4 00110400
("INPUT STATEMENT ATTEMPTED IN BATCH MODE AT LINE",I6), 00110500
("GO TO UNDEFINED STATEMENT NUMBER AT LINE ",I6), %6 00110600
("RETURN WITHOUT GOSUB AT LINE ",I6), %7 00110700
("ARGUMENT FOR SIN,COS,TAN OR EXP EXCEEDS 158 AT LINE",I6), %8 00110800
("INCREMENT UNDEFINED OR ZERO AT LINE ",I6), %9 00110900
("NEXT WITHOUT FOR AT LINE ",I6), %10 00111000
("STORAGE EXCEEDED AT LINE ",I6), %11 00111100
("INTEGER OVERFLOW AT LINE ",I6), %12 00111200
("INVALID ADDRESS AT LINE ",I6), %13 00111300
("DIVIDE BY ZERO AT LINE ",I6), %14 00111400
("ILLEGAL EXPONENTIATION AT LINE ",I6), %15 00111500
("FLOATING-POINT OVERFLOW AT LINE ",I6), %16 00111600
("GOSUBS NESTED TOO DEEP (MORE THAN 10) AT LINE ",I6), %17 00111700
("ILLEGAL EXPONENT ON INPUT AT LINE ",I6), %18 00111800
("MISPLACED STRING IN INPUT AT LINE ",I6), %19 00111900
("INPUT STRING TOO LONG AT LINE ",I6), %20 00112000
("OUT OF DATA AT LINE ",I6),("ERR22",I6), % ERR22 SHOULDNT OCCUR 21,22 00112100
("ILLEGAL MATRIX OPERATION AT LINE ",I6), %23 00112200
("INVERSE OF ILL-CONDITIONED MATRIX AT LINE ",I6), %24 00112300
("INSUFFICIENT SPARE STORAGE FOR MAT OP AT LINE ",I6), %25 00112400
("ILLEGAL FILE OPERATION AT LINE ",I6), %26 00112500
("INPUT FILE NOT ON DISK AT LINE",I6), %27 00112600
("INPUT FILE - INVALID USER AT LINE",I6), %28 00112700
("INPUT FILE IS NON-STANDARD AT LINE",I6), %29 00112800
("OUTPUT FILE - DUPLICATE NAME AT LINE",I6); %30 00112900
COMMENT LAST MESSAGE HERE IS NO. 30 ; 00113000
FORMAT DUR("THE FOLLOWING LINE WAS AWAITING OUTPUT:"), 00113100
FILAT(A6," FILE SEQUENCE NO.",I8); 00113130
WRITE(TTY,ERR[A],SSEQ[CS]); 00113150
IF INFILTOG THEN WRITE(TTY,FILAT," INPUT",IR); 00113170
IF OUTFILTOG THEN WRITE(TTY,FILAT,"OUTPUT",NR); 00113200
IF DELTA(POUB,PIOB) GTR 0 THEN BEGIN WRITE(TTY,DUR); 00113300
WRITE(TTY,9,IOB[*]) END; 00113400
LOCK(FIL1);LOCK(FIL2);GO TO STOP END; 00113500
00113600
COMMENT --- EVAL EVALUATES ARITHMETIC EXPRESSION 00113700
(REVERSE POLISH DECODER) ; 00113800
00113900
REAL PROCEDURE EVAL; 00114000
BEGIN 00114100
LABEL EQ,DONE,EXPON,RPT,SS,S,NUM,VR,AR,SF,UF,AD,SU,MU,DI,EX,FIN, 00114200
INM,STRGA,STRGC,STRGV; 00114300
SWITCH TYP:=FIN,NUM,VR,AR,UF,SF,FIN,EQ,INM,AD,SU,MU,DI,EX,STRGV, 00114400
STRGA,STRGC; 00114500
DEFINE TOP=STK[STCK];STCK:=STCK-1#; 00114600
DEFINE STACK(STACK1)=STCK:=STCK+1;STK[STCK]:=STACK1;GO TO SS#; 00114700
COMMENT ADDR RETURNS RESULT ADDRESS (IN STORE IF REAL, STRGS 00114800
IF STRING). INTERMEDIATE RESULTS AND ADDRESSES ARE STACKED 00114900
IN STK AND ADR RESECTIVELY. ; 00115000
STRIN:=FALSE;STCK:=0; 00115100
SS: ADR[STCK]:=ADDR;CHA:=GET;GO TO TYP[CHA+1]; 00115200
NUM: A:=GET;A:=A|64+GET;STACK(CONST[A]); 00115300
STRGV: ADDR:=GET;STRIN:=TRUE;STACK(0); 00115400
STRGA: K:=GET;A:=TOP;IF A LEQ 0 OR A GTR STRAR[K,1] 00115500
THEN ERROR(1);ADDR:=STRAR[K,0]+A;STRIN:=TRUE;STACK(0); 00115600
STRGC: A:=GET;K:=GET;REPLACE POINTER(STRGS[0,1])BY POINTER 00115700
(PROG[CS,2])+K FOR A;STRGS[0,0]:=A;STRIN:=TRUE;ADDR:=0;STACK(0); 00115800
INM: STACK(0); 00115900
VR: K:=GET;K:=K-1;ADDR:=11|K+GET;STACK(STORE[ADDR]); 00116000
AR: K:=GET;A:=B:=TOP;IF ARR[K,2] NEQ 0 THEN BEGIN 00116100
A:=TOP;IF B LEQ 0 OR B GTR ARR[K,2] THEN ERROR(1) END; 00116200
IF A LEQ 0 OR A GTR ARR[K,1] THEN ERROR(1); 00116300
ADDR:=ARR[K,0]+(A-1)|ARR[K,2]+B-1;STACK(STORE[ADDR]); 00116400
SF: 00116500
BEGIN LABEL SQR,SIF,COF,TAF,ATF,EXF,LOF,ABF,ENF,FNQ,DC, 00116600
FIX,SGN,RND; 00116700
SWITCH SFUN:=SIF,COF,TAF,ATF,EXF,LOF,ABF,ENF,SQR,FIX,SGN,RND; 00116800
DEFINE TEST=IF ABS(R)>158 THEN ERROR(8)#; 00116900
A:=GET;R:=TOP;GO TO SFUN[A-18]; 00117000
SIF: TEST;R:=SIN(R);GO TO DC; 00117100
COF: TEST;R:=COS(R); GO TO DC; 00117200
TAF: TEST;R:=SIN(R)/COS(R); GO TO DC; 00117300
ATF: R:=ARCTAN(R); GO TO DC; 00117400
EXF: TEST;R:=EXP(R); GO TO DC; 00117500
LOF: IF R LEQ 0 THEN ERROR(2);R:=LN(R); GO TO DC; 00117600
ABF: R:=ABS(R); GO TO DC; 00117700
SQR: IF R LSS 0 THEN ERROR(3);R:=R*.5; GO TO DC; 00117800
ENF: R:=ENTIER(R);GO TO DC; 00117900
FIX: R:=ENTIER(R);IF R LSS 0 THEN R:=R+1;GO TO DC; 00118000
SGN: R:=IF R LSS 0 THEN -1 ELSE IF R GTR 0 THEN 1 ELSE 0; 00118100
GO TO DC; 00118200
RND: XRND:=XRND|2899;XRND:=XRND.[23:23]; 00118300
R:=XRND|2*(-23);GO TO DC; 00118400
DC: STACK(R) END; 00118500
COMMENT USER FUNCTIONS SECTION ; 00118600
UF: BEGIN INTEGER AS,SVSK,SVADDR; 00118700
ARRAY DUM[1:20,1:4],SVSTK,SVADR[0:20]; 00118800
K:=GET;AS:=CS;CS:=FUNC[K];IF CS=0 THEN BEGIN CS:=AS;ERROR(4) END; 00118900
B:=CO;CO:=SPOB[CS];C:=GET;FOR A:=1 STEP 1 UNTIL SUB[K] DO BEGIN 00119000
COMMENT SAVE VALUES OF FORMAL PARAMETERS AND STORE ACTUALS; 00119100
R:=TOP;C:=GET;C:=64|C+GET;DUM[A,1]:=C;DUM[A,2]:=STORE[C];STORE[C]:=R 00119200
END;SVADDR:=ADDR;SVSK:=STCK; 00119300
FOR A:=0 STEP 1 UNTIL 20 DO BEGIN SVSTK[A]:=STK[A];SVADR[A]:=ADR[A] 00119400
END; 00119500
COMMENT NOW EVALUATE FUNCTION ANO RESTORE FORMAL PARAMETERS; 00119600
R:=EVAL;FOR A:=1 STEP 1 UNTIL SUB[K] DO STORE[DUM[A,1]]:=DUM[A,2]; 00119700
FOR A:=0 STEP 1 UNTIL 20 DO BEGIN STK[A]:=SVSTK[A];ADR[A]:=SVADR[A] 00119800
END;ADDR:=SVADDR;STCK:=SVSK; 00119900
CS:=AS;CO:=B;STACK(R) END; 00120000
EQ: IF STRIN THEN BEGIN ADDR:=A:=ADR[STCK];STCK:=STCK-1; 00120100
B:=ADR[STCK];REPLACE POINTER(STRGS[B,*]) BY POINTER(STRGS[A,*]) 00120200
FOR 3 WORDS;TR4(B);GO TO SS END;R:=TOP;ADDR:=ADR[STCK]; 00120300
STORE[ADDR]:=STK[STCK]:=R;TR1(R);GO TO SS; 00120400
AD: R:=TOP;R:=R+TOP;STACK(R); 00120500
SU: R:=TOP;R:=-R+TOP;STACK(R); 00120600
MU: R:=TOP;R:=R|TOP;STACK(R); 00120700
DI: R:=TOP;R:=1/R|TOP;STACK(R); 00120800
EX: T:=TOP;R:=TOP;IF T NEQ ENTIER(T) AND R LSS 0 00120900
THEN ERROR(15);STACK(R*T); 00121000
FIN: EVAL:=STK[1] END; 00121100
COMMENT 00121200
--- OUTP OUTPUTS CONTENTS OF PSEUDO-BUFFER ; 00121300
00121400
PROCEDURE OUTP; 00121500
BEGIN IF MF>0 THEN ERROR(26);TR3; 00121600
WRITE(FL[OU],14,IOB[*]);REPLACE PIOB:=POUB:=POINTER(IOB[*]) BY 00121700
" " FOR 112;IF OU=1 THEN PIOB:=POUB:=POUB+20 END; 00121800
COMMENT 00121900
--- MORE FALSE IF END OF STATEMENT ; 00122000
00122100
BOOLEAN PROCEDURE MORE; 00122200
BEGIN INTEGER A,B;A:=CO;B:=GET;MORE:=B NEQ 0;CO:=A END; 00122300
COMMENT 00122400
--- OUTNUM PLACES NUMBER IN PSEUDO-BUFFER ; 00122500
00122600
PROCEDURE OUTNUM(A,F);VALUE A,F;REAL A;INTEGER F; 00122700
BEGIN CHA:=0;CP:=CP-1;WRITE(IOBE[*],NUM[F],A); % CARE: 00122800
SCAN APR:CPR FOR 16 UNTIL ="@"; 00123200
IF DELTA(CPR,APR) NEQ 16 THEN REPLACE APR BY "E" FOR 1; 00123300
IF DELTA(POUB,PIOB) GTR 60+F|4 THEN OUTP; 00123400
REPLACE PIOB:PIOB BY POINTER(IOBE[1]) FOR 14 UNTIL=48; 00123500
REPLACE PIOB:PIOB BY " " FOR 1 END; 00123600
COMMENT 00123700
--- QUO PLACES " IN OUTPUT BUFFER ; 00123800
DEFINE QUO=IF MF>0 THEN REPLACE PIOB:PIOB BY """#; 00123900
COMMENT 00124000
--- MATOP PROCESSES MOST MAT STATEMENTS ; 00124100
00124200
PROCEDURE MATOP; 00124300
BEGIN INTEGER U,V,W,X,Y,Z,I,J; 00124400
COMMENT MAT STATEMENTS CONCERNED HAVE FORMAT 00124500
<N> MAT LET <L>=<M> 00124600
<N> MAT <L>=<M> 00124700
THE SECOND CHARACTER IN <M> IS USED TO IDENTIFY ACTION TAKEN 00124800
THIS CAN BE * + - E O D R N % 00124900
(RECALL % IS END-STATEMENT CHARACTER) ; 00125000
LABEL DONE,ADSU,EQM,CONS,EX,EY;REAL PIVOT,AI; 00125100
INTEGER ARRAY IR[1:72];REAL ARRAY TEM[1:72]; 00125200
DEFINE AA(AA1,AA2)=STORE[ARR[K,0]+(AA1-1)|U+AA2-1]#; 00125300
CP:=GET;CHA:=0;K:=CHCONV(NCH);IF K=0 THEN ERROR(23); 00125400
IF NCH NEQ 61 THEN ERROR(23);A:=CHCONV(NCH);CHA:=NCH; 00125500
COMMENT SWITCH OCCURS HERE 00125600
* MATRIX MULTIPLICATION 00125700
<M> IS <L>*<L> 00125800
HASH STORAGE IS USED TO AVOID TROUBLE WITH A=A*B ETC ; 00125900
ON("*") BEGIN B:=CHCONV(NCH); 00126000
U:=ARR[K,1]-1;V:=ARR[K,2]-1;W:=ARR[A,1]-1;X:=ARR[A,2]-1; 00126100
Y:=ARR[B,1]-1;Z:=ARR[B,2]-1;IF U NEQ W OR V NEQ Z OR X NEQ Y 00126200
THEN ERROR(23);IF MSTO+(U+1)|(V+1) GTR 1000 THEN ERROR(25); 00126300
FOR W:=0 STEP 1 UNTIL U DO FOR Z:=0 STEP 1 UNTIL V DO BEGIN R:=0; 00126400
FOR Y:=0 STEP 1 UNTIL X DO R:=R+STORE[ARR[A,0]+X|W+W+Y]| 00126500
STORE[ARR[B,0]+Y|V+Y+Z];STORE[MSTO+W|V+W+Z]:=R END; 00126600
FOR W:=0 STEP 1 UNTIL U DO FOR Z:=0 STEP 1 UNTIL V DO 00126700
STORE[ARR[K,0]+W|V+W+Z]:=STORE[MSTO+W|V+W+Z]; 00126800
GO TO DONE END; 00126900
COMMENT + MATRIX ADDITION 00127000
<M> IS <L>+<L> ; 00127100
ON("+") BEGIN Z:=1;GO TO ADSU END; 00127200
COMMENT - MATRIX SUBTRACTION 00127300
<M> IS <L>-<L> ; 00127400
ON("-") BEGIN Z:=-1;GO TO ADSU END; 00127500
COMMENT O ALL ONES 00127600
<M> IS CON ; 00127700
ON("O") BEGIN Z:=Y:=1;GO TO CONS END; 00127800
COMMENT D IDENTITY MATRIX 00127900
<M> IS IDN ; 00128000
ON("D") BEGIN IF ARR[K,1] NEQ ARR[K,2] THEN ERROR(23);Z:=1;Y:=0; 00128100
COMMENT E ZERO MATRIX 00128200
<M> IS ZER ; 00128300
GO TO CONS END; ON("E") BEGIN Z:=Y:=0;GO TO CONS END; 00128400
COMMENT R TRANSPOSITION 00128500
<M> IS TRN(<L>) 00128600
HASH STORAGE USED TO AVOID TROUBLE WITH A=TRN(A) ; 00128700
ON("R") BEGIN CHA:=NCH;CHA:=NCH;A:=CHCONV(NCH);IF A=0 THEN ERROR(23); 00128800
U:=ARR[K,1]-1;V:=ARR[K,2]-1;W:=ARR[A,1]-1;X:=ARR[A,2]-1; 00128900
IF U NEQ X OR V NEQ W THEN ERROR(23); 00129000
IF MSTO+(U+1)|(V+1) GTR 1000 THEN ERROR(25); 00129100
FOR U:=0 STEP 1 UNTIL X DO FOR V:=0 STEP 1 UNTIL W DO 00129200
STORE[MSTO+U|W+U+V]:=STORE[ARR[A,0]+V|X+V+U]; 00129300
FOR U:=0 STEP 1 UNTIL X DO FOR V:=0 STEP 1 UNTIL W DO 00129400
STORE[ARR[K,0]+U|W+U+V]:=STORE[MSTO+U|W+U+V]; 00129500
GO TO DONE END; 00129600
COMMENT N INVERSION 00129700
<M> IS INV(<L>) ; 00129800
ON("N") BEGIN CHA:=NCH;CHA:=NCH;A:=CHCONV(NCH); 00129900
U:=ARR[K,1];IF U NEQ ARR[K,2] OR U NEQ ARR[A,1] OR U NEQ ARR[A,2] 00130000
THEN ERROR(23);FOR I:=0 STEP 1 UNTIL U-1 DO FOR J:=0 STEP 1 UNTIL U-1 00130100
DO AA(I+1,J+1):=STORE[ARR[A,0]+I|U+J]; 00130200
FOR V:=1 STEP 1 UNTIL U DO BEGIN PIVOT:=0; 00130300
FOR I:=1 STEP 1 UNTIL U DO BEGIN IF V NEQ 1 THEN BEGIN 00130400
FOR X:=1 STEP 1 UNTIL V-1 DO IF I=IR[X] THEN GO TO EX END; 00130500
IF ABS(AA(I,V))GTR ABS(PIVOT) THEN BEGIN PIVOT:=AA(I,V);Y:=IR[V]:=I 00130600
END; 00130700
EX: END;IF ABS(PIVOT) LSS .0001 THEN ERROR(24); 00130800
FOR J:=1 STEP 1 UNTIL U DO AA(Y,J):=AA(Y,J)/PIVOT;AA(Y,V):=1/PIVOT; 00130900
FOR I:=1 STEP 1 UNTIL U DO IF I NEQ Y THEN BEGIN AI:=AA(I,V); 00131000
AA(I,V):=-AI/PIVOT;FOR J:=1 STEP 1 UNTIL U DO IF J NEQ V THEN 00131100
AA(I,J):=AA(I,J)-AI|AA(Y,J) END END; 00131200
FOR I:=1 STEP 1 UNTIL U DO 00131300
BEGIN FOR J:=1 STEP 1 UNTIL U DO TEM[J]:=AA(I,J); 00131400
FOR J:=1 STEP 1 UNTIL U DO AA(I,IR[J]):=TEM[J] END; 00131500
FOR J:=1 STEP 1 UNTIL U DO BEGIN FOR I:=1 STEP 1 UNTIL U DO 00131600
TEM[I]:=AA(IR[I],J);FOR I:=1 STEP 1 UNTIL U DO AA(I,J):=TEM[I] 00131700
END;GO TO DONE END; 00131800
% EQUALITY 00131900
COMMENT <M> IS <L> ; 00132000
ON("%") BEGIN B:=A;Z:=0; GO TO EQM END; 00132100
ERROR(23); 00132200
ADSU: B:=CHCONV(NCH);IF B=0 THEN ERROR(23); 00132300
IF ARR[A,1] NEQ ARR[B,1] OR ARR[A,2] NEQ ARR[A,2] THEN ERROR(23); 00132400
EQM: U:=ARR[K,1];V:=ARR[K,2];IF U NEQ ARR[A,1] 00132500
OR V NEQ ARR[A,2] THEN ERROR(23); 00132600
FOR I:=0 STEP 1 UNTIL U-1 DO FOR J:=0 STEP 1 UNTIL V-1 DO 00132700
AA(I+1,J+1):=STORE[ARR[A,0]+I|U+J]+Z|STORE[ARR[B,0]+I|U+J]; 00132800
GO TO DONE; 00132900
CONS: U:=ARR[K,I];FOR I:=1 STEP 1 UNTIL ARR[K,1] DO 00133000
FOR J:=1 STEP 1 UNTIL ARR[K,2] DO AA(I,J):=IF I=J THEN Z ELSE Y; 00133100
DONE: GO TO INCST END; 00133200
LABEL RPT,REM,DAT,EXS,LET,RLET,ONX, 00133300
INP,PRI,RPRI,XPRI,MAT,ENX,RREA,XREA,QDAT,FREA,RES,NDAT, 00133400
STRV,FOL,INTVR,INDEXR,DZER,EXPVR, 00133500
NM,TAB,COM,STR,EPRI,OUD,OUF, 00133600
IFF,GOT,GOX,GOS,RET,FOX,NEX,FD,DEF,REA,EREA,RAN,PAG; 00133700
SWITCH OPN:=LET,GOT,GOS,RET,INP,REA,EPRI,FOX,NEX,MAT, 00133800
DEF,DAT,RAN,PAG,RES,REM,ENX,ENX,IFF,ONX; 00133900
00134000
SWITCH TYP:=XPRI,COM,NM,TAB,STR,INCST,STRV; 00134100
00134200
COMMENT----------------------------------------------------------------00134300
----------------- EXECUTE BEGINS HERE --------------------00134400
-----------------------------------------------------------------------;00134500
00134600
INTOVR:=INTVR;EXPOVR:=EXPVR;ZERO:=DZER;INDEX:=INDEXR; 00134700
WRITE(TTY,MESS);RT:=TIME(2)+TIM;IF OU=1 THEN WRITE(TTY,DVO); 00134800
WRITE(FL[OU],SPC);NR:=IR:=RDAT:=RDTP:=NGOT:=0;TRACEON:=TLIN:=FALSE; 00134900
FORC:=SLVE:=0;XRND:=101;CS:=ACS-1; 00135000
POUB:=PIOB:=POINTER(IOB[*])+20|OU; 00135100
REPLACE POINTER(IOB[*]) BY " " FOR 112; 00135200
00135300
% GET FILES IF NEEDED: 00135400
IF INFILTOG THEN BEGIN FILL FIL1 WITH IO[1],TIME(-1); 00135500
SEARCH(FIL1,ANSA[*]);IF ANSA[0] LEQ 0 THEN ERROR(28+ANSA[0]); 00135600
IF ANSA[3] NEQ 10 OR ANSA[4] NEQ 300 THEN ERROR(29) END; 00135700
IF OUTFILTOG THEN BEGIN FILL FIL2 WITH IO[2],TIME(-1); 00135800
SEARCH(FIL2,ANSA[*]);IF ANSA[0] NEQ -1 THEN BEGIN 00135900
WRITE(TTY,F13,IO[2].[41:36]); 00136000
IF IU=2 THEN U:=0 ELSE 00136100
READ(TTY,REP,U);IF U NEQ "YES" THEN ERROR(30) END END; 00136200
00136300
COMMENT RETURN TO HERE AFTER EACH STATEMENT; 00136400
00136500
REM:DAT:INCST: TR3;CS:=CS+1; 00136600
EXS: MF:=0; % FIRST SEE IF EXCESS TIME 00136700
IF TIME(2) GTR RT THEN BEGIN WRITE(TTY,BK);GO TO ENX END; 00136800
IF STYP[CS]>19 THEN BEGIN TRACEON:=STYP[CS]=20;GO INCST END; 00136900
IF TRACEON THEN TLIN:=TRUE; 00137000
00137100
00137200
U:=STYP[CS];CO:=SPOB[CS];GO TO OPN[U]; % NOW GO TO APPROPRIATE PLACE 00137300
% LET STATEMENT 00137400
LET: R:=EVAL;GO TO INCST; 00137500
% ON STATEMENT 00137600
ONX: U:=EVAL; 00137700
FOR V:=1 STEP 1 UNTIL 2|U-2 DO BEGIN S:=GET END;GO GOT; %(STET) 00137800
% IF STATEMENT 00137900
IFF: R:=EVAL;IF STRIN THEN BEGIN 00138000
COMMENT STRING IF ; 00138100
U:=GET; 00138200
REPLACE IPR:=POINTER(STRGS[-1,*]) BY POINTER(STRGS[ADDR,*]) FOR 24; 00138300
R:=EVAL;GO IF IPR=POINTER(STRGS[ADDR,*]) 00138400
FOR STRGS[-1,0]+8 EQV U=1 THEN GOT ELSE INCST END; 00138500
COMMENT REAL IF ; 00138600
U:=GET;R:=R-EVAL; 00138700
IF R GTR 0 AND U.[2:1]=1 THEN GO TO GOT ELSE 00138800
IF R LSS 0 AND U.[1:1]=1 THEN GO TO GOT ELSE 00138900
IF R = 0 AND U.[0:1]=1 THEN GO TO GOT;GO TO INCST; 00139000
% GOTO STATEMENT 00139100
GOT: U:=GET;U:=64|U+GET;IF U=0 THEN ERROR(6); 00139200
GOX: NGOT:=NGOT+1;TR2(U); 00139300
COMMENT MONITOR FOR EXCESS LOOPING; 00139400
IF NGOT=100 AND IU NEQ 2 THEN BEGIN WRITE(TTY,WRN);READ(TTY,REP,W); 00139500
IF W NEQ "YES" THEN GO TO STOP END; 00139600
CS:=U;GO EXS; 00139700
% GOSUB STATEMENT 00139800
GOS: SLVE:=SLVE+1;IF SLVE GTR 10 THEN ERROR(17); 00139900
SVE[SLVE]:=CS;GO GOT; 00140000
% RETURN STATEMENT 00140100
RET: IF SLVE=0 THEN ERROR(7); 00140200
CS:=SVE[SLVE];SLVE:=SLVE-1;GO TO INCST; 00140300
% FOR STATEMENT 00140400
FOX: FORC:=GET;R:=EVAL; 00140500
00140600
COMMENT FORX CONTROL INFO IS STORED AS FOLLOWS: 00140700
1 2 3 4 00140800
ADDR STEP FINAL FORLINE 00140900
A FOR LOOP IS EXECUTED ZERO TIMES IN THE RIGHT CIRCUMSTANCES; 00141000
00141100
V:=FORX[FORC,1]:=ADDR;S:=FORX[FORC,3]:=EVAL; 00141200
T:=FORX[FORC,2]:=IF MORE THEN EVAL ELSE 1; 00141300
W:=FORX[FORC,4]:=CS;IF T=0 THEN ERROR(9); 00141400
IF T|R LEQ T|S THEN GO INCST; % ELSE SKIP LOOP 00141500
U:=GET;U:=GET;CS:=64|U+GET;GO TO INCST; 00141600
00141700
% NEXT STATEMENT 00141800
% SPOB STORES (NEXTS LEVEL IN FORX)+16|FORLINE 00141900
NEX: U:=SPOB[CS].[3:4];V:=SPOB[CS].[41:38]; 00142000
IF V NEQ FORX[U,4] THEN ERROR(10);L:=FORX[U,1]; 00142100
T:=FORX[U,2];R:=STORE[L]+T; 00142200
IF T|R LEQ T|FORX[U,3] THEN BEGIN STORE[L]:=R;TR1(R);T:=FORX[U,4]; 00142300
TR2(T+1);CS:=T END ELSE FORX[U,4]:=0; 00142400
GO TO INCST; 00142500
% DEFINE STATEMENT 00142600
DEF: U:=GET;FUNC[U]:=CS;GO TO INCST; 00142700
% READ STATEMENT 00142800
REA: U:=0; 00142900
COMMENT THIS SECTION IS COMPLICATED BECAUSE OF SWITCHING 00143000
OF ATTENTION FROM READ STATEMENT TO DATA STATEMENT AND BACK ETC; 00143100
RREA: R:=EVAL;L:=ADDR;U:=CS;V:=CO; 00143200
IF RDTP=0 THEN GO TO QDAT;CO:=RDTP;CS:=RDAT; 00143300
XREA: IF STRIN THEN BEGIN R:=EVAL;CS:=U;IF NOT STRIN THEN 00143400
ERROR(20);REPLACE POINTER(STRGS[L,*])BY POINTER(STRGS[ADDR,*]) 00143500
FOR 3 WORDS;TR4(L) END ELSE BEGIN R:=EVAL;IF STRIN THEN ERROR(20); 00143600
STORE[L]:=R;CS:=U;TR1(R) END;RDTP:=IF MORE THEN CO ELSE 0;CO:=V; 00143700
IF MORE THEN GO TO RREA ELSE GO TO INCST; 00143800
COMMENT FIND ANOTHER DATA STATEMENT; 00143900
QDAT: FOR CS:=RDAT+1 STEP 1 UNTIL MS DO BEGIN 00144000
IF STYP[CS]=12 THEN GO TO FREA END; 00144100
CS:=U;ERROR(21); 00144200
FREA: RDAT:=CS;CO:=SPOB[CS];GO TO XREA; 00144300
% INPUT STATEMENT 00144400
% "STOP" AT START OF INPUT STREAM STOPS A RUN 00144500
INP: BEGIN LABEL RINP,EVINP,RPT,EXPON,DONE,FINP; 00144600
MF:=GET;IF MF=0 THEN BEGIN IF IU=2 THEN ERROR(5); 00144700
IF DELTA(POUB,PIOB) GTR 0 THEN BEGIN 00144800
REPLACE POINTER(IOBE[*]) BY POUB FOR 72;WRITE(TTY[STOP],9,IOBE[*]); 00144900
REPLACE PIOB:=POUB:=POINTER(IOB[*]) BY " " FOR 112;IF OU=1 THEN 00145000
PIOB:=POUB:=PIOB+20 END;READ(TTY,9,IOBE[*]); 00145100
READ(IOBE[*],REP,V);IF V="STO" THEN GO TO STOP END 00145200
ELSE BEGIN Z:=GET;Z:=64|Z+GET;READ(FIL1,10,IOBE[*])[OUD]; 00145300
READ(IOBE[*],SNUM,IR) END; 00145350
REPLACE POINTER(PROG[0,2]) BY POINTER(IOBE[1]) FOR 72;X:=0; 00145400
RINP: R:=EVAL;L:=ADDR;U:=CS;CS:=0;CP:=X;CHA:=0; 00145500
IF NCH="%" THEN BEGIN IF MF=0 THEN BEGIN WRITE(TTY,MNP[IF X=0 THEN 1 00145600
ELSE 0],PROG[U,1]);CS:=U;GO TO EXS END ELSE BEGIN 00145700
READ(FIL1,9,IOBE[*])[OUD]; 00145800
REPLACE POINTER(PROG[0,2]) BY POINTER(IOBE[*]) FOR 72;CP:=1 END END; 00145900
COMMENT INPUT STRING MAY OR MAY NOT HAVE "" ; 00146000
EVINP: CP:=CP-1;CHA:=NCH;IF STRIN THEN BEGIN 00146100
ON(63) SCAN APR:APR:=CPR:=POINTER(PROG[0,2])+CP FOR 15 WHILE NEQ 63 00146200
ELSE BEGIN CP:=CP-2;SCAN APR:APR:=CPR:=POINTER(PROG[0,2])+CP+1 FOR 15 00146300
WHILE IN ALPHA END; 00146400
V:=DELTA(CPR,APR);IF V>14 THEN BEGIN CS:=U;ERROR(20) END; 00146500
STRGS[L,0]:=V;REPLACE POINTER(STRGS[L,1]) BY CPR FOR V; 00146600
CP:=CP+V+1;CHA:=NCH;CS:=U;TR4(L);GO FINP END; 00146700
T:=R:=Y:=0; 00146800
COMMENT INPUT NUMBER ; 00146900
ON(44) BEGIN T:=1;CHA:=NCH END; 00147000
RPT: ON(26) BEGIN Y:=1;CHA:=NCH END; 00147100
IF CHA GEQ 10 THEN GO TO EXPON;IF Y GTR 0 THEN 00147200
BEGIN R:=R+CHA|10*(-Y); 00147300
Y:=Y+1 END ELSE R:=R|10 +CHA;CHA:=NCH; GO TO RPT; 00147400
EXPON: IF CHA NEQ 21 THEN GO TO DONE;Y:=1;CHA:=NCH;Z:=0; 00147500
ON(44)BEGIN Y:=-1;CHA:=NCH END ELSE ON(16) CHA:=NCH; 00147600
IF CHA GEQ 10 THEN BEGIN CS:=U;ERROR(18) END;Z:=CHA;CHA:=NCH; 00147700
IF CHA LSS 10 THEN BEGIN Z:=Z|10+CHA;CHA:=NCH END; 00147800
R:=R|10*(Y|Z); 00147900
DONE: IF T=1 THEN R:=-R;DELIM:=72;STORE[L]:=R;CS:=U;TR1(R); 00148000
FINP: X:=CP;IF CHA NEQ 58 AND CHA NEQ "%" THEN ERROR(19); 00148100
IF MORE THEN GO TO RINP ELSE GO TO INCST END; 00148200
% RANDOMISE STATEMENT 00148300
RAN: XRND:=(2|TIME(1)+1).[23:23];GO TO INCST; 00148400
% RESTORE STATEMENT 00148500
RES: MF:=GET;IF MF=0 THEN RDTP:=RDAT:=0 ELSE REWIND(FIL1); 00148600
GO INCST; 00148700
% PRINT STATEMENT 00148800
EPRI: MF:=GET;IF MF>0 THEN BEGIN PBR:=PIOB; 00148900
TR3;Z:=GET;Z:=64|Z+GET; 00149000
POUB:=POINTER(IOF[*]);REPLACE PIOB:=POINTER(IOF[*]) BY " " FOR 72 END; 00149100
PRI: CHA:=GET;IF MF>0 AND CHA=5 THEN ERROR(26); 00149200
GO TO TYP[CHA+1]; 00149300
Z:=GET;Z:=64|Z+GET; 00149400
COMMENT , IN PRINT MOVES TO NEXT 14-SPACE COLUMN. 00149500
00149600
(SEMICOLON IN MIDDLE OF PRINT IS JUST DELIMITER); 00149700
COM: IF MF>0 THEN REPLACE PIOB:PIOB BY "," ELSE BEGIN 00149800
V:=DELTA(POUB,PIOB);IF V GTR 56 THEN BEGIN 00149900
OUTP;V:=0 END ELSE V:=14-(V MOD 14); 00150000
FOR U:=1 STEP 1 UNTIL V DO REPLACE PIOB:PIOB BY " " END; 00150100
GO TO PRI; 00150200
COMMENT PLACE STRING IN PSEUDO-BUFFER ; 00150300
STR: CP:=GET; 00150400
CPR:=POINTER(PROG[CS,2])+CP; 00150500
V:=72-DELTA(POUB,PIOB);W:=GET; 00150600
IF W GTR V THEN BEGIN REPLACE PIOB:PIOB BY CPR:CPR FOR V; 00150700
OUTP;W:=W-V END; 00150800
QUO;REPLACE PIOB:PIOB BY CPR:CPR FOR W;QUO; 00150900
GO TO PRI; 00151000
00151100
COMMENT TAB OVERWRITES ON TELETYPE AND LINE-PRINTER 00151200
BUT REPLACES ON VIDEO UNIT. ; 00151300
00151400
TAB: IF MF>0 THEN ERROR(26);U:=EVAL-1;U:=U MOD 72; 00151500
IF IU+OU NEQ 0 THEN BEGIN TR3;WRITE(FL[OU][NO],9,IOB[*]); 00151600
REPLACE POUB BY " " FOR 72 END;PIOB:=POUB+U; GO TO PRI; 00151700
STRV: R:=EVAL;QUO;REPLACE PIOB:PIOB BY POINTER(STRGS[ADDR,1]) 00151800
FOR STRGS[ADDR,0];QUO;GO TO PRI; 00151900
NM: OUTNUM(EVAL,0);GO TO PRI; 00152000
XPRI: IF MF>0 THEN BEGIN REPLACE PIOB BY ","; 00152100
NR:=NR+10;REPLACE POINTER(IOF[10]) BY NR FOR 8 DIGITS; 00152200
WRITE(FIL2,10,IOF[*])[OUF];PIOB:=PBR;POUB:=POINTER(IOB[*])+20|OU END 00152300
ELSE OUTP;GO TO INCST; 00152400
% PAGE STATEMENT 00152500
PAG: IF OU=1 THEN WRITE(LIN[PAGE]);GO TO INCST; 00152600
% MAT STATEMENT 00152700
% MAT 1=READ, 2=PRINT, 3=MATOP, 4=SCALAR MULTIPLE 00152800
MAT: BEGIN INTEGER E,F,G;LABEL QDAT,FREA,XREA,RREA; 00152900
L:=GET;IF L=1 THEN BEGIN E:=CS;L:=GET;U:=GET;V:=GET; 00153000
FOR W:=0 STEP 1 UNTIL U-1 DO FOR X:=0 STEP 1 UNTIL V-1 DO BEGIN 00153100
IF RDTP = 0 THEN GO TO QDAT;CO:=RDTP;CS:=RDAT; 00153200
XREA: STORE[ARR[L,0]+W|ARR[L,2]+X]:=EVAL; 00153300
RDTP:=IF MORE THEN CO ELSE 0;GO TO RREA; 00153400
QDAT: FOR CS:=RDAT + 1 STEP 1 UNTIL MS DO BEGIN IF STYP[CS] 00153500
=12 THEN GO TO FREA END;CS:=E;ERROR(21); 00153600
FREA: RDAT:=CS;CO:=SPOB[CS];GO TO XREA; 00153700
RREA: END;CS:=E;GO TO INCST END; 00153800
IF L=2 THEN BEGIN 00153900
IF DELTA(POUB,PIOB) GTR 0 THEN OUTP; 00154000
L:=GET;U:=GET;V:=GET;E:=GET;G:=14-E|7;FOR W:=0 STEP 1 UNTIL U-1 DO 00154100
BEGIN FOR X:=0 STEP 1 UNTIL V-1 DO BEGIN OUTNUM(STORE[ARR[L,0]+ 00154200
W|ARR[L,2]+X],E);PIOB:=POUB+G|((DELTA(POUB,PIOB)-1) DIV G +1) 00154300
END;OUTP END;GO TO INCST END; 00154400
IF L=3 THEN MATOP; 00154500
L:=GET;R:=EVAL;W:=GET; 00154600
IF ARR[L,1] NEQ ARR[W,1] OR ARR[L,2] NEQ ARR[W,2] THEN ERROR(23); 00154700
FOR U:=0 STEP 1 UNTIL ARR[L,1]-1 DO FOR V:=0 STEP 1 UNTIL ARR[L,2]-1 00154800
DO STORE[ARR[L,0]+U|ARR[L,2]+V]:=R|STORE[ARR[W,0]+U|ARR[L,2]+V]; 00154900
GO TO INCST END; 00155000
% STOP OR END STATEMENT 00155100
ENX: TR3;IF DELTA(POUB,PIOB)>0 THEN OUTP; 00155200
LOCK(FIL1);LOCK(FIL2);GO TO STOP; 00155300
OUD: IF Z=0 THEN ERROR(21);TR2(Z);CS:=Z;GO EXS; 00155400
OUF: IF Z=0 THEN ERROR(26);TR2(Z);CS:=Z;GO EXS; 00155500
INTVR: ERROR(12);INDEXR: ERROR(13); 00155600
DZER: ERROR(14);EXPVR: ERROR(16) END; 00155700
STOP: WRITE(TTY,STP,"RUN ");GO TO SOURCEIN; 00155800
COMMENT 00155900
PROGRAM WRITTEN BY MALCOLM CROWE 00156000
LANGUAGE DETAILS DECIDED BY IAN MILLER AND JOHN FURLONG 00156100
MATRIX INVERSION CORRECTED BY ARTHUR MACDIVITT ; 00156200
00156300
FINSH: END. 00156400
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