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eval.s
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.segment "CODE"
; ----------------------------------------------------------------------------
; "NEXT" STATEMENT
; ----------------------------------------------------------------------------
NEXT:
bne NEXT1
ldy #$00
beq NEXT2
NEXT1:
jsr PTRGET
NEXT2:
sta FORPNT
sty FORPNT+1
jsr GTFORPNT
beq NEXT3
ldx #$00
GERR:
beq JERROR
NEXT3:
txs
.ifndef CONFIG_2
inx
inx
inx
inx
.endif
txa
.ifdef CONFIG_2
clc
adc #$04
pha
adc #BYTES_FP+1
sta DEST
pla
.else
inx
inx
inx
inx
inx
.ifndef CONFIG_SMALL
inx
.endif
stx DEST
.endif
ldy #>STACK
jsr LOAD_FAC_FROM_YA
tsx
lda STACK+BYTES_FP+4,x
sta FACSIGN
lda FORPNT
ldy FORPNT+1
jsr FADD
jsr SETFOR
ldy #>STACK
jsr FCOMP2
tsx
sec
sbc STACK+BYTES_FP+4,x
beq L2C22
lda STACK+2*BYTES_FP+5,x
sta CURLIN
lda STACK+2*BYTES_FP+6,x
sta CURLIN+1
lda STACK+2*BYTES_FP+8,x
sta TXTPTR
lda STACK+2*BYTES_FP+7,x
sta TXTPTR+1
L2C1F:
jmp NEWSTT
L2C22:
txa
adc #2*BYTES_FP+7
tax
txs
jsr CHRGOT
cmp #$2C
bne L2C1F
jsr CHRGET
jsr NEXT1
; ----------------------------------------------------------------------------
; EVALUATE EXPRESSION, MAKE SURE IT IS NUMERIC
; ----------------------------------------------------------------------------
FRMNUM:
jsr FRMEVL
; ----------------------------------------------------------------------------
; MAKE SURE (FAC) IS NUMERIC
; ----------------------------------------------------------------------------
CHKNUM:
clc
.byte $24
; ----------------------------------------------------------------------------
; MAKE SURE (FAC) IS STRING
; ----------------------------------------------------------------------------
CHKSTR:
sec
; ----------------------------------------------------------------------------
; MAKE SURE (FAC) IS CORRECT TYPE
; IF C=0, TYPE MUST BE NUMERIC
; IF C=1, TYPE MUST BE STRING
; ----------------------------------------------------------------------------
CHKVAL:
bit VALTYP
bmi L2C41
bcs L2C43
L2C40:
rts
L2C41:
bcs L2C40
L2C43:
ldx #ERR_BADTYPE
JERROR:
jmp ERROR
; ----------------------------------------------------------------------------
; EVALUATE THE EXPRESSION AT TXTPTR, LEAVING THE
; RESULT IN FAC. WORKS FOR BOTH STRING AND NUMERIC
; EXPRESSIONS.
; ----------------------------------------------------------------------------
FRMEVL:
ldx TXTPTR
bne L2C4E
dec TXTPTR+1
L2C4E:
dec TXTPTR
ldx #$00
.byte $24
FRMEVL1:
pha
txa
pha
lda #$01
jsr CHKMEM
jsr FRM_ELEMENT
lda #$00
sta CPRTYP
FRMEVL2:
jsr CHRGOT
L2C65:
sec
sbc #TOKEN_GREATER
bcc L2C81
cmp #$03
bcs L2C81
cmp #$01
rol a
eor #$01
eor CPRTYP
cmp CPRTYP
bcc SNTXERR
sta CPRTYP
jsr CHRGET
jmp L2C65
L2C81:
ldx CPRTYP
bne FRM_RELATIONAL
bcs L2D02
adc #$07
bcc L2D02
adc VALTYP
bne L2C92
jmp CAT
L2C92:
adc #$FF
sta INDEX
asl a
adc INDEX
tay
FRM_PRECEDENCE_TEST:
pla
cmp MATHTBL,y
bcs FRM_PERFORM1
jsr CHKNUM
L2CA3:
pha
L2CA4:
jsr FRM_RECURSE
pla
ldy LASTOP
bpl PREFNC
tax
beq GOEX
bne FRM_PERFORM2
; ----------------------------------------------------------------------------
; FOUND ONE OR MORE RELATIONAL OPERATORS <,=,>
; ----------------------------------------------------------------------------
FRM_RELATIONAL:
lsr VALTYP
txa
rol a
ldx TXTPTR
bne L2CBB
dec TXTPTR+1
L2CBB:
dec TXTPTR
ldy #$1B
sta CPRTYP
bne FRM_PRECEDENCE_TEST
PREFNC:
cmp MATHTBL,y
bcs FRM_PERFORM2
bcc L2CA3
; ----------------------------------------------------------------------------
; STACK THIS OPERATION AND CALL FRMEVL FOR
; ANOTHER ONE
; ----------------------------------------------------------------------------
FRM_RECURSE:
lda MATHTBL+2,y
pha
lda MATHTBL+1,y
pha
jsr FRM_STACK1
lda CPRTYP
jmp FRMEVL1
SNTXERR:
jmp SYNERR
; ----------------------------------------------------------------------------
; STACK (FAC)
; THREE ENTRY POINTS:
; 1, FROM FRMEVL
; 2, FROM "STEP"
; 3, FROM "FOR"
; ----------------------------------------------------------------------------
FRM_STACK1:
lda FACSIGN
ldx MATHTBL,y
; ----------------------------------------------------------------------------
; ENTER HERE FROM "STEP", TO PUSH STEP SIGN AND VALUE
; ----------------------------------------------------------------------------
FRM_STACK2:
tay
pla
sta INDEX
.ifndef CONFIG_2B
inc INDEX ; bug: assumes not on page boundary
; bug exists on AppleSoft II
.endif
pla
sta INDEX+1
.ifdef CONFIG_2B
inc INDEX
bne LEB69
inc INDEX+1
LEB69:
.endif
tya
pha
; ----------------------------------------------------------------------------
; ENTER HERE FROM "FOR", WITH (INDEX) = STEP,
; TO PUSH INITIAL VALUE OF "FOR" VARIABLE
; ----------------------------------------------------------------------------
FRM_STACK3:
jsr ROUND_FAC
.ifndef CONFIG_SMALL
lda FAC+4
pha
.endif
lda FAC+3
pha
lda FAC+2
pha
lda FAC+1
pha
lda FAC
pha
jmp (INDEX)
L2D02:
ldy #$FF
pla
GOEX:
beq EXIT
; ----------------------------------------------------------------------------
; PERFORM STACKED OPERATION
;
; (A) = PRECEDENCE BYTE
; STACK: 1 -- CPRMASK
; 5 -- (ARG)
; 2 -- ADDR OF PERFORMER
; ----------------------------------------------------------------------------
FRM_PERFORM1:
cmp #$64
beq L2D0E
jsr CHKNUM
L2D0E:
sty LASTOP
FRM_PERFORM2:
pla
lsr a
sta CPRMASK
pla
sta ARG
pla
sta ARG+1
pla
sta ARG+2
pla
sta ARG+3
pla
.ifndef CONFIG_SMALL
sta ARG+4
pla
.endif
sta ARGSIGN
eor FACSIGN
sta SGNCPR
EXIT:
lda FAC
rts
; ----------------------------------------------------------------------------
; GET ELEMENT IN EXPRESSION
;
; GET VALUE OF VARIABLE OR NUMBER AT TXTPNT, OR POINT
; TO STRING DESCRIPTOR IF A STRING, AND PUT IN FAC.
; ----------------------------------------------------------------------------
FRM_ELEMENT:
lda #$00
sta VALTYP
L2D31:
jsr CHRGET
bcs L2D39
L2D36:
jmp FIN
L2D39:
jsr ISLETC
bcs FRM_VARIABLE
.ifdef CONFIG_CBM_ALL
cmp #$FF
bne LCDC1
lda #<CON_PI
ldy #>CON_PI
jsr LOAD_FAC_FROM_YA
jmp CHRGET
CON_PI:
.byte $82,$49,$0f,$DA,$A1
LCDC1:
.endif
cmp #$2E
beq L2D36
cmp #TOKEN_MINUS
beq MIN
cmp #TOKEN_PLUS
beq L2D31
cmp #$22
bne NOT_
; ----------------------------------------------------------------------------
; STRING CONSTANT ELEMENT
;
; SET Y,A = (TXTPTR)+CARRY
; ----------------------------------------------------------------------------
STRTXT:
lda TXTPTR
ldy TXTPTR+1
adc #$00
bcc L2D57
iny
L2D57:
jsr STRLIT
jmp POINT
; ----------------------------------------------------------------------------
; "NOT" FUNCTION
; IF FAC=0, RETURN FAC=1
; IF FAC<>0, RETURN FAC=0
; ----------------------------------------------------------------------------
NOT_:
cmp #TOKEN_NOT
bne L2D74
ldy #$18
bne EQUL
; ----------------------------------------------------------------------------
; COMPARISON FOR EQUALITY (= OPERATOR)
; ALSO USED TO EVALUATE "NOT" FUNCTION
; ----------------------------------------------------------------------------
EQUOP:
jsr AYINT
lda FAC_LAST
eor #$FF
tay
lda FAC_LAST-1
eor #$FF
jmp GIVAYF
L2D74:
.ifdef SYM1
cmp #TOKEN_USR
bne LCC8A
jmp LCDBD
LCC8A:
cmp #$26
bne LCC91
jmp LCDFE
LCC91:
.endif
cmp #TOKEN_FN
bne L2D7B
jmp L31F3
L2D7B:
cmp #TOKEN_SGN
bcc PARCHK
jmp UNARY
; ----------------------------------------------------------------------------
; EVALUATE "(EXPRESSION)"
; ----------------------------------------------------------------------------
PARCHK:
jsr CHKOPN
jsr FRMEVL
CHKCLS:
lda #$29
.byte $2C
CHKOPN:
lda #$28
.byte $2C
CHKCOM:
lda #$2C
; ----------------------------------------------------------------------------
; UNLESS CHAR AT TXTPTR = (A), SYNTAX ERROR
; ----------------------------------------------------------------------------
SYNCHR: ; XXX all CBM code calls SYNCHR instead of CHKCOM
ldy #$00
cmp (TXTPTR),y
bne SYNERR
jmp CHRGET
; ----------------------------------------------------------------------------
SYNERR:
ldx #ERR_SYNTAX
jmp ERROR
; ----------------------------------------------------------------------------
MIN:
ldy #$15
EQUL:
pla
pla
jmp L2CA4
; ----------------------------------------------------------------------------
FRM_VARIABLE:
jsr PTRGET
FRM_VARIABLE_CALL = *-1
sta FAC_LAST-1
sty FAC_LAST
.ifdef CONFIG_CBM_ALL
lda VARNAM
ldy VARNAM+1
.endif
ldx VALTYP
beq L2DB1
.ifdef CONFIG_CBM_ALL
.ifdef CONFIG_CBM1_PATCHES
jmp PATCH2
clc
LCE3B:
.else
ldx #$00
stx STRNG1+1
bit FAC_LAST
bpl LCE53 ; XXX Assumes vars are <32K and C_ZERO lives above!
cmp #$54 ; T
bne LCE53
.endif
cpy #$C9 ; I$
bne LCE53
jsr GETTIM
sty EXPON ; Y=0
dey
sty STRNG2
ldy #$06
sty INDX
ldy #$24
jsr LDD3A
jmp LD353
LCE53:
.endif
.ifdef CONFIG_2
.ifndef CBM2
; bugfix?
; fixed on AppleSoft II, not on any CBM
ldx #$00
stx STRNG1+1
.endif
.endif
rts
L2DB1:
.ifndef CONFIG_SMALL
ldx VALTYP+1
bpl L2DC2
ldy #$00
lda (FAC+3),y
tax
iny
lda (FAC+3),y
tay
txa
jmp GIVAYF
L2DC2:
.endif
.ifdef CONFIG_CBM1_PATCHES
jmp PATCH3
.byte $19
.endif
.ifdef CBM2
bit FAC_LAST
bpl LCE90 ; XXX Assumes vars are <32K and C_ZERO lives above!
cmp #$54 ; T
bne LCE82
.endif
.ifndef CONFIG_CBM_ALL
jmp LOAD_FAC_FROM_YA
.endif
.ifdef CONFIG_CBM_ALL
LCE69:
cpy #$49 ; I
.ifdef CBM1
bne LCE82
.else
bne LCE90
.endif
jsr GETTIM
tya ; FOR FLOAT3 (Y=0)
ldx #$A0 ; EXPONENT
jmp FLOAT3
GETTIM:
lda #<(TISTR-2)
ldy #>(TISTR-2)
sei
jsr LOAD_FAC_FROM_YA
cli
sty FAC+1 ; ZERO HIGHEST.
rts
LCE82:
cmp #$53 ; S
bne LCE90
cpy #$54 ; T
bne LCE90
lda Z96
jmp FLOAT
LCE90:
lda FAC_LAST-1
ldy FAC_LAST
jmp LOAD_FAC_FROM_YA
.endif
; ----------------------------------------------------------------------------
UNARY:
asl a
pha
tax
jsr CHRGET
cpx #<(TOKEN_LEFTSTR*2-1)
bcc L2DEF
jsr CHKOPN
jsr FRMEVL
jsr CHKCOM
jsr CHKSTR
pla
tax
lda FAC_LAST
pha
lda FAC_LAST-1
pha
txa
pha
jsr GETBYT
pla
tay
txa
pha
jmp L2DF4
L2DEF:
jsr PARCHK
pla
tay
L2DF4:
lda UNFNC-TOKEN_SGN-TOKEN_SGN+$100,y
sta JMPADRS+1
lda UNFNC-TOKEN_SGN-TOKEN_SGN+$101,y
sta JMPADRS+2
.ifdef KBD
jsr LF47D
.else
jsr JMPADRS
.endif
jmp CHKNUM
; ----------------------------------------------------------------------------
OR:
ldy #$FF
.byte $2C
; ----------------------------------------------------------------------------
TAND:
ldy #$00
sty EOLPNTR
jsr AYINT
lda FAC_LAST-1
eor EOLPNTR
sta CHARAC
lda FAC_LAST
eor EOLPNTR
sta ENDCHR
jsr COPY_ARG_TO_FAC
jsr AYINT
lda FAC_LAST
eor EOLPNTR
and ENDCHR
eor EOLPNTR
tay
lda FAC_LAST-1
eor EOLPNTR
and CHARAC
eor EOLPNTR
jmp GIVAYF
; ----------------------------------------------------------------------------
; PERFORM RELATIONAL OPERATIONS
; ----------------------------------------------------------------------------
RELOPS:
jsr CHKVAL
bcs STRCMP
lda ARGSIGN
ora #$7F
and ARG+1
sta ARG+1
lda #<ARG
ldy #$00
jsr FCOMP
tax
jmp NUMCMP
; ----------------------------------------------------------------------------
; STRING COMPARISON
; ----------------------------------------------------------------------------
STRCMP:
lda #$00
sta VALTYP
dec CPRTYP
jsr FREFAC
sta FAC
stx FAC+1
sty FAC+2
lda ARG_LAST-1
ldy ARG_LAST
jsr FRETMP
stx ARG_LAST-1
sty ARG_LAST
tax
sec
sbc FAC
beq L2E74
lda #$01
bcc L2E74
ldx FAC
lda #$FF
L2E74:
sta FACSIGN
ldy #$FF
inx
STRCMP1:
iny
dex
bne L2E84
ldx FACSIGN
NUMCMP:
bmi CMPDONE
clc
bcc CMPDONE
L2E84:
lda (ARG_LAST-1),y
cmp (FAC+1),y
beq STRCMP1
ldx #$FF
bcs CMPDONE
ldx #$01
CMPDONE:
inx
txa
rol a
and CPRMASK
beq L2E99
lda #$FF
L2E99:
jmp FLOAT
.ifdef SYM1
LCDBD:
jsr CHRGET
jsr CHKOPN
jsr FRMEVL
jsr CHRGOT
cmp #$29
beq LCDF1
jsr AYINT
lda FAC+4
ldy FAC+3
sta USR+1
sty USR+2
LCDD8:
jsr CHKCOM
jsr FRMEVL
jsr CHRGOT
cmp #$29
beq LCDF1
jsr AYINT
lda FAC+3
pha
lda FAC+4
pha
jmp LCDD8
LCDF1:
jsr CHRGET
jsr AYINT
lda FAC+3
ldy FAC+4
jmp USR
LCDFE:
lda ZD4
pha
lda ZD3
pha
jsr CHRGET
cmp #$22
bne LCE49
jsr CHRGET
jsr LCE2B
tax
jsr CHRGOT
jsr LCE2B
pha
jsr CHRGOT
cmp #$22
bne LCE48
jsr CHRGET
pla
tay
pla
pla
txa
jmp GIVAYF
LCE2B:
jsr ASCNIB
bcs LCE47
pha
jsr CHRGET
jsr ASCNIB
sta FAC+4
bcs LCE46
jsr CHRGET
pla
asl a
asl a
asl a
asl a
ora FAC+4
rts
LCE46:
pla
LCE47:
pla
LCE48:
pla
LCE49:
pla
sta ZD3
pla
sta ZD4
jmp ZERO_FAC
.endif