148 lines
5.2 KiB
Plaintext
148 lines
5.2 KiB
Plaintext
1010 *--------------------------------
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1020 * "SCRN(" FUNCTION
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1030 *--------------------------------
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1040 SCREEN JSR CHRGET
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1050 JSR PLOTFNS GET COLUMN AND ROW
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1060 TXA ROW
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1070 LDY FIRST COLUMN
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1080 JSR MON.SCRN GET 4-BIT COLOR THERE
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1090 TAY
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1100 JSR SNGFLT CONVERT (Y) TO REAL IN FAC
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1110 JMP CHKCLS REQUIRE ")"
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1120 *--------------------------------
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1130 * PROCESS UNARY OPERATORS (FUNCTIONS)
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1140 *--------------------------------
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1150 UNARY CMP #TOKEN.SCRN NOT UNARY, DO SPECIAL
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1160 BEQ SCREEN
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1170 ASL DOUBLE TOKEN TO GET INDEX
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1180 PHA
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1190 TAX
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1200 JSR CHRGET
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1210 CPX #TOKEN.LEFTSTR*2-1 LEFT$, RIGHT$, AND MID$
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1220 BCC .1 NOT ONE OF THE STRING FUNCTIONS
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1230 JSR CHKOPN STRING FUNCTION, NEED "("
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1240 JSR FRMEVL EVALUATE EXPRESSION FOR STRING
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1250 JSR CHKCOM REQUIRE A COMMA
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1260 JSR CHKSTR MAKE SURE EXPRESSION IS A STRING
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1270 PLA
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1280 TAX RETRIEVE ROUTINE POINTER
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1290 LDA VPNT+1 STACK ADDRESS OF STRING
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1300 PHA
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1310 LDA VPNT
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1320 PHA
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1330 TXA
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1340 PHA STACK DOUBLED TOKEN
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1350 JSR GETBYT CONVERT NEXT EXPRESSION TO BYTE IN X-REG
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1360 PLA GET DOUBLED TOKEN OFF STACK
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1370 TAY USE AS INDEX TO BRANCH
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1380 TXA VALUE OF SECOND PARAMETER
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1390 PHA PUSH 2ND PARAM
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1400 JMP .2 JOIN UNARY FUNCTIONS
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1410 .1 JSR PARCHK REQUIRE "(EXPRESSION)"
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1420 PLA
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1430 TAY INDEX INTO FUNCTION ADDRESS TABLE
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1440 .2 LDA UNFNC-TOKEN.SGN-TOKEN.SGN+$100,Y
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1450 STA JMPADRS+1 PREPARE TO JSR TO ADDRESS
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1460 LDA UNFNC-TOKEN.SGN-TOKEN.SGN+$101,Y
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1470 STA JMPADRS+2
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1480 JSR JMPADRS DOES NOT RETURN FOR
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1490 * CHR$, LEFT$, RIGHT$, OR MID$
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1500 JMP CHKNUM REQUIRE NUMERIC RESULT
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1510 *--------------------------------
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1520 OR LDA ARG "OR" OPERATOR
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1530 ORA FAC IF RESULT NONZERO, IT IS TRUE
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1540 BNE TRUE
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1550 *--------------------------------
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1560 AND LDA ARG "AND" OPERATOR
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1570 BEQ FALSE IF EITHER IS ZERO, RESULT IS FALSE
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1580 LDA FAC
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1590 BNE TRUE
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1600 *--------------------------------
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1610 FALSE LDY #0 RETURN FAC=0
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1620 .HS 2C TRICK
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1630 *--------------------------------
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1640 TRUE LDY #1 RETURN FAC=1
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1650 JMP SNGFLT
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1660 *--------------------------------
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1670 * PERFORM RELATIONAL OPERATIONS
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1680 *--------------------------------
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1690 RELOPS JSR CHKVAL MAKE SURE FAC IS CORRECT TYPE
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1700 BCS STRCMP TYPE MATCHES, BRANCH IF STRINGS
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1710 LDA ARG.SIGN NUMERIC COMPARISON
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1720 ORA #$7F RE-PACK VALUE IN ARG FOR FCOMP
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1730 AND ARG+1
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1740 STA ARG+1
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1750 LDA #ARG
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1760 LDY /ARG
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1770 JSR FCOMP RETURN A-REG = -1,0,1
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1780 TAX AS ARG <,=,> FAC
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1790 JMP NUMCMP
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1800 *--------------------------------
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1810 * STRING COMPARISON
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1820 *--------------------------------
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1830 STRCMP LDA #0 SET RESULT TYPE TO NUMERIC
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1840 STA VALTYP
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1850 DEC CPRTYP MAKE CPRTYP 0000<=>0
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1860 JSR FREFAC
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1870 STA FAC STRING LENGTH
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1880 STX FAC+1
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1890 STY FAC+2
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1900 LDA ARG+3
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1910 LDY ARG+4
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1920 JSR FRETMP
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1930 STX ARG+3
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1940 STY ARG+4
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1950 TAX LEN (ARG) STRING
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1960 SEC
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1970 SBC FAC SET X TO SMALLER LEN
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1980 BEQ .1
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1990 LDA #1
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2000 BCC .1
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2010 LDX FAC
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2020 LDA #$FF
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2030 .1 STA FAC.SIGN FLAG WHICH SHORTER
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2040 LDY #$FF
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2050 INX
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2060 STRCMP.1
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2070 INY
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2080 DEX
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2090 BNE STRCMP.2 MORE CHARS IN BOTH STRINGS
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2100 LDX FAC.SIGN IF = SO FAR, DECIDE BY LENGTH
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2110 *--------------------------------
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2120 NUMCMP BMI CMPDONE
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2130 CLC
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2140 BCC CMPDONE ...ALWAYS
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2150 *--------------------------------
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2160 STRCMP.2
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2170 LDA (ARG+3),Y
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2180 CMP (FAC+1),Y
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2190 BEQ STRCMP.1 SAME, KEEP COMPARING
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2200 LDX #$FF IN CASE ARG GREATER
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2210 BCS CMPDONE IT IS
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2220 LDX #1 FAC GREATER
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2230 *--------------------------------
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2240 CMPDONE
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2250 INX CONVERT FF,0,1 TO 0,1,2
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2260 TXA
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2270 ROL AND TO 0,2,4 IF C=0, ELSE 1,2,5
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2280 AND CPRMASK 00000<=>
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2290 BEQ .1 IF NO MATCH: FALSE
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2300 LDA #1 AT LEAST ONE MATCH: TRUE
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2310 .1 JMP FLOAT
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2320 *--------------------------------
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2330 * "PDL" FUNCTION
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2340 * <<< NOTE: ARG<4 IS NOT CHECKED >>>
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2350 *--------------------------------
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2360 PDL JSR CONINT GET # IN X
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2370 JSR MON.PREAD READ PADDLE
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2380 JMP SNGFLT FLOAT RESULT
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2390 *--------------------------------
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2400 * "DIM" STATEMENT
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2410 *--------------------------------
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2420 NXDIM JSR CHKCOM SEPARATED BY COMMAS
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2430 DIM TAX NON-ZERO, FLAGS PTRGET DIM CALLED
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2440 JSR PTRGET2 ALLOCATE THE ARRAY
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2450 JSR CHRGOT NEXT CHAR
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2460 BNE NXDIM NOT END OF STATEMENT
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2470 RTS
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