directive

.PAGE 'DIRECTIVE'

; EQUATE AND ORG PROCESSING ****

H102	LDA #$FF        ;-1
	STA JORG
	INC ICOLP
	STX ILSST       ;SAVE START OF STRING
	JSR NFNDNB      ;IF REST FIELD BLANK
	BCS H103        ;NONBLANK FOUND
H103A	JMP H99

H103	LDA ICRD,X      ;EQUATE OR ORG
	CMP #'='
	BNE H103A
H121	INC ICOLP
	LDA ICOLP
	CMP IMAXCL
	BEQ H8804
	BCC H8804
	JMP H99         ;G.T. IMAXCL
H8804	JSR NFNDNB
	BCS H104        ;NON-BLANK FOUND
	LDX ICSE
	LDA #7
	LDY #0
	JMP LTS1
H104	JSR EVAL        ;EVAL OPERAND FIELD
	DEC RETURN
	BMI H105
	BNE H8806
	LDA #$11
	LDY #3
	JMP LTS1

H8806	LDA #$13
	LDY #3
	JMP LTS1

H105	LDA JORG        ;EQU OR ORG
	BEQ H9
	LDA #1          ;ORG,EXPRESSION OK
	AND IFLAGS+1
	BEQ H150        ;EXPRESSION IS GE 0
	LDX #0
	STX IPC
	STX IPC+1
	LDX ICSB        ;BAD EXPR - FLAG
	LDA #$21
	LDY #$FF
	JSR LTINS
	JMP ENDLN

H150	LDX #0
	TXA
	TAY
	JSR LTINS
	LDA IEXP        ;IPC = IEXP
	STA IPC+1
	LDA IEXP+1
	STA IPC
	JMP ENDLN

; IS EQUATE****

H9	PLA             ;RESTORE LABEL PORTION
	STA ICSL        ;RESTORE LENGTH
	LDX #5
H8846	PLA
	STA ISYM,X
	DEX
	BPL H8846
	JSR NFIND
	BCC H106

	LDA KNVAL       ;SEE IF VALUE IS THE SAME
	CMP IEXP
	BNE MR01
	LDA KNVAL+1
	CMP IEXP+1
	BEQ H106A       ;OK
MR01	LDX ILSST       ;ALREADY DEFINED
	LDA #2
	LDY #0
	JMP LTS1

H106	LDA IEXP
	STA KNVAL
	LDA IEXP+1
	STA KNVAL+1
	JSR NSERT
H106A	JMP H990

; ASSEMBLER DIRECTIVES *****
; FIND WHAT DIRECTIVE TO PROCESS

H5	LDA #$14        ;ASM ERROR CODE
	STA IERR
	LDX ICSB        ;START OF DIRECTIVE
	INX             ;SKIP PERIOD
	LDA #<ASMDIR
	STA TBLPTR
	LDA #>ASMDIR
	STA TBLPTR+1
	LDA #3          ;GET LENGTH
	STA KLEN
	JSR CONSYM      ;BUILD DIRECTIVE
H8847	CPX IMAXCL
	BEQ H8848
	BCS H8849
H8848	LDA ICRD,X
	CMP #$20
	BEQ H8849
	INX
	JMP H8847

H8849	STX ICOLP       ;PNTR TO CHAR AFTER DIRECT
	LDA #0          ;INIT COLUMN TO ZERO
	STA J
	BCS H8835
	JMP H900        ;ERROR--BAD SYMBOL

.PAGE
; SEARCH TABLE FOR MATCH
;
; COMPARE DONE BACK-FRONT
; MATCH-IND JMP MADE TO PROCESS
; MISMATCH-POINTER POINTS TO NEXT
; VALID DIRECTIVE IN TABLE.
; NUMASM IS # DIRECT TO SEARCH.
; (TBLPTR) IS CURR DIRECTIVE

H8835	LDX #NUMASM
H9938	LDY #2          ;OFFSET TO CHARS
H9939	LDA ISYM,Y      ;CHR FROM SYMBOL
	CMP (TBLPTR),Y  ;CHAR IN TABLE
	BNE H9940

	DEY
	BPL H9939       ;NOT DONE YET

; A MATCH-X USED TO LOC ADDR

	TXA
	ASL A           ;*2 FOR ADDR TABLE INDEX
	TAX
	LDA ASMJMP,X    ;LOW BYTE ADDR
	STA TBLPTR
	LDA ASMJMP+1,X  ;HIGH BYTE ADDR
	STA TBLPTR+1
	LDA IFLAGS      ;.OPT FLGS
	JMP (TBLPTR)    ;=>DIRECTIVE PROVESS

; POINT NEXT DIR & START AGAIN
; QUIT IF DONE (ERROR).

H9940	LDA TBLPTR      ;LOW ADDR
	CLC
	ADC #3          ;OFFSET TO NEXT DIRECTIVE
	STA TBLPTR
	BCC H9938A
	INC TBLPTR+1
H9938A	DEX
	BPL H9938       ;MORE DIRECTIVES

; INVALID DIRECTIVE - ERROR

	JMP H900        ;PUT IN LENGTH TABLE





; BYTE, WORD, DBYTE PROCESSING ***

H111	LDA #1          ;*** .BYTE ***
	.BYTE $2C

H506	LDA #3          ;*** DOUBLE BYTE ***
	.BYTE $2C

H113	LDA #2          ;*** .WORD ***
	STA JBYWOR
	LDY #0
	STY J           ;MEMMAP INDEX FOR BYTE GEN
	TAY
	CPY #3          ;DBYTE ?
	BNE H8809       ;NO
	DEY
H8809	STY CHAR        ;LENGTH OF EACH PARAM.
	JSR NFNDNB      ;NEXT NON-BLANK
	BCS H18X        ;NON-BLANK FOUND

	LDX ICSE        ;RAN OFF EOL
	LDA #7
	JMP LTS1

H18X	STY CHAR
H18	LDX ICSB
	JSR EVAL
	DEC RETURN
	BMI H14         ;RETURN =0
	BEQ H8836       ;RETURN =1
	JMP H29         ;RETURN =2

H8836	LDA #1          ;UNDEF'D SYM
	STA IERR
XXXO	CMP #1
	BNE XXXM
	LDY JBYWOR
	STY CHAR
	JMP XXXN
XXXM	LDY CHAR
XXXN	LDA IERR
	LDX ICSB
	JSR LTINS
	LDY #0
	STY J
	LDY CHAR
	CPY #3
	BNE H15
	DEC CHAR
	JMP H15

H14	LDA #4          ;GOOD RETURN
	STA IERR
	LDX JBYWOR
	CPX #3
	BNE H8812
	LDA IEXP
	LDY J
	JSR OBJOUT
	INC J
H8812	LDA IEXP+1
	LDY J
	JSR OBJOUT
	INC J
	LDX JBYWOR
	CPX #2
	BNE H8820
	LDA IEXP
	LDY J
	JSR OBJOUT      ;IEXP IN MEMORY MAP
	INC J
H8820	LDA IFLAGS+1
	AND #$09
	BNE XXXO
	CPX #1
	BNE XXXP
	LDA IEXP
	BNE XXXO
XXXP	LDA #0
	TAX
	LDY CHAR
	STA J
	JSR LTINS
H15	JSR NFNCMP
	BCS H8843
	JMP ENDLN

H8843	LDA ICRD,X

; FOUND COMMA OR PARENTHESIS

	INX             ;SKIP TO NEXT COLUMN
	STX ICOLP
	CPX IMAXCL      ;PASSED END
	BEQ H8814
	BCC H8814
	JMP H99         ;RAN OFF END OF CARD

H8814	CMP #','
	BNE H15         ;MIGHT BE A PAREN
	JSR NFNDNB
	BCS H8844       ;NON BLANK FOUND
	JMP H99         ;ONLY BLANKS FOUND
H8844	JMP H18

; EXPRESSION HANDLER BOMBED

H29	LDA ICRD,X
	CMP #$27        ;MIGHT BE ASCII (APPOSTROPHI)
	BEQ H31         ;YES
H30	LDA #$13        ;BAD EXPRESSION
	LDY TEMP
	JSR LTINS
	LDY #0
	STY J
	JMP H15

; LOOKS LIKE ASCII

H31	CPX ICSB        ;FIRST IN STRING
	BNE H30
	LDY JBYWOR      ;AFTER A .BYT
	CPY #2
	BCS H30

	STX ICOLP       ;COUNT BYTES GENERATED
	LDY #0
H33	INC ICOLP
	LDX ICOLP
	CPX IMAXCL      ;OFF END OF CARD?
	BEQ H8815
	BCS H473        ;OFF CARD
H8815	LDA ICRD,X
	CMP #$27        ;A QUOTE?
	BNE H32         ;NO

	INC ICOLP       ;IMBEDDED QUOTE
	LDX ICOLP
	CPX IMAXCL
	BEQ H8821
	BCS H34         ;RAN OFF END OF CARD
H8821	LDA ICRD,X
	CMP #$27        ;A QUOTE?
	BNE H34         ;NO

H32	PHA
	AND #$7F
	CMP #$20
	BCC XXXQ
	CMP #$60
	BCC XXXR
XXXQ	PLA
	LDA #0
	PHA
XXXR	PLA
	LDY J           ;CONVERT TO ASCII
	JSR OBJOUT
	INC J           ;COUNT OF ASCII CHARS
	BNE H33         ; ** BRA
H34	LDY J

	LDA #0
	STA J
	TAX
	JSR LTINS
	JMP H15

H473	LDY J           ;*** RAN OFF END OF CARD ***
	LDA #7
	JMP LTS1

.PAGE
; .OPT ASSEMBLER DIRECTIVE
; LOOK FOR PARMS UNTIL NONE LEFT
; WHEN DONE TREAT AS A COMMENT
; USE SEARCH FROM ASMB DIRECTIVES

H301	JSR NFNDNB      ;FIND STT OF PARM
	BCS H8837       ;A NONBLANK FOUND
	JMP H990        ;NO-TREAT LIKE COMMENT
H8837	LDX ICSB        ;GET START OF PARM
	LDA #3          ;3 IS LENGTH OF PARM
	STA KLEN        ;STORE FOR CONSYM
	JSR CONSYM      ;CONSTRUCT THE PARM
	BCS H8838       ;O.K.  SO CONTINUE
	JMP H900        ;BAD PARM - ERROR

; ARE READY FOR SEARCH
; NEED TO RESTORE X AND THE ADRS
; WHERE THE SEARCH LEFT OFF

H8838	LDA #<OPTDIR
	STA TBLPTR
	LDA #>OPTDIR
	STA TBLPTR+1
	LDX #NUMSAV
	JMP H9938       ;GO DO THE SEARCH


; GENERATE ASCII STRINGS

H323	AND #127        ;CLEAR NOGEN BIT
	.BYTE $2C

; DON'T GENERATE ASCII STRINGS

H302	ORA #128        ;SET NOGEN BIT
	.BYTE $2C

; SYMBOLS ************

H303	ORA #64         ;SET SYM BIT
	.BYTE $2C

; DON'T PRINT SYMBOL TABLE

H304	AND #191        ;CLEAR SYM BIT
	.BYTE $2C

; DON'T COUNT OP CODE USAGE

H305	AND #223        ;CLEAR OPCODE CNT
	.BYTE $2C

; COUNT OP CODE USAGE

H306	ORA #32         ;SET OPCODE COUNT
	.BYTE $2C

; GENERATE ERROR FILE

H307	ORA #16         ;SET ERROR GEN BIT
	.BYTE $2C

; DON'T GENERATE ERROR FILE

H308	AND #239        ;CLEAR ERROR GEN
	.BYTE $2C

; GENERATE INTERFACE FILE

H309	ORA #8          ;SET INTERFACE FILE
	.BYTE $2C

; DON'T GEN INTERFACE FILE

H310	AND #247        ;NO GEN INT FILE
	.BYTE $2C

; DON'T SUPPRESS PRINT FILE

H311	ORA #4          ;SET LIST
	.BYTE $2C

; SUPPRESS PRINT FILE

H312	AND #251        ;TURN OFF PRT FILE

H390	STA IFLAGS      ;ALL DONE WITH THIS PARM



H391	JSR NFNCMP      ;LOOK FOR COMMA & START AGAIN
	BCS H8840       ;COMMA OR RIGHT PAREN
	JMP ENDLN       ;NONE FOUND

H8840	LDA ICRD,X      ;ICRD(ICOLP)
	CMP #','        ;A COMMA?
	BEQ H8839       ;YES,
	JMP ENDLN       ;NO,
H8839	INX
	STX ICOLP
	JMP H301

; SKIP ***

H26	JSR NFNDNB      ;NEXT NON-BLANK
	BCS H8808       ;NON-BLANK FOUND
	LDX J
H8808	LDA #204
	LDY #0
	JMP LTS1

; PAGE ***
; HAS A TITLE WITH IT?

H12	JSR NFNDNB      ;NEXT NONBLANK
	BCC H8807       ;ONLY BLANKS FOUND
	LDA ICRD,X      ;NEXT TITLE CHAR
	CMP #$27        ;A QUOTE?
	BEQ H600        ;YES
H8807	LDX #0
H600	LDA #203
	LDY #0
	JMP LTS1

; END ***

H10	BIT SFILE       ;WHAT IS DONE?
	BVS ENLIB       ;A LIBRARY ROUTINE...
	LDX #$FF        ;A SOURCE FILE...
	TXS
	LDX PASS        ;WHICH PASS ON SOURCE?
	BEQ DEND2       ;PASS1...

;
; ***** COMPLETION OF PASS 2 *****
;

DEND0	LDA #2          ;LOGICAL FILE #2
	JSR CLOSE       ;IS SOURCE TO CLOSE
DEND1	LDX #0
	TXA
	TAY
;   INC LBOTH
	JSR LTINS       ;PRINT THE .END
;   DEC LBOTH
	JMP PASS3       ;THEN SORT & PRT SYMS

;
; ***** END OF PASS 1 *****
;

DEND2	INC PASS
	LDA #2
	JSR CLOSE
DEND2A	JMP PASS2

ENLIB	LDA #3          ;CLOSE LIBRARY FILE
	JSR CLOSE
	LDA SFILE
	AND #$BF        ;SWITCH CONTROL
	STA SFILE
ENDR	LDX #0
	STX CHAN
	LDY #0
	LDA #205
	INC LBOTH
	JSR LTINS
	DEC LBOTH
	LDA #$0D
	STA LCHAR
	JMP ENDLN



; FILE ***

HFIL	BIT SFILE
	BVC HFIL2       ;NOT IN .LIB
	LDA #3          ;CLOSE .LIB FILE
	JSR CLOSE
	JMP DLIB1       ;REOPEN .LIB AS .FIL
HFIL2	LDA #2          ;CLOSE OLD FILE
	JSR CLOSE
	JSR NFILE       ;PARSE NEW FILE
	LDA #2
	STA LA          ;LOGICAL ADDRESS
	STA SA          ;SECONDARY ADDRESS
	LDA #8
	STA FA          ;DEVICE NUMBER
	JSR OPEN
	JSR FTEST
	JMP ENDR



; COMMON PARSE ROUTINE

NFILE	JSR NFNDNB      ;FIND STT OF NAM
	BCC NFIL1       ;NO NAME
	LDY #0
NFIL3	LDA ICRD,X
	CMP #$20
	BEQ NFIL4
	STA ISYM,Y
	CPX IMAXCL
	BEQ NFIL4
	INY
	INX
	CPY #14
	BNE NFIL3
	BEQ NFIL1
NFIL4	LDA #$0D
	INY
	STY FNLEN
	STA LCHAR
	BNE NFIL2
NFIL1	LDA #>FNERR
	LDY #<FNERR
	JSR WSCRN
	JMP DONE

NFIL2	LDX FNLEN       ;ADD FILE TYPE
	LDA #','
	STA ISYM,X
	INX
	LDA #'S'
	STA ISYM,X
	INX
	STX FNLEN
	LDA #>ISYM      ;SET UP NAME CALL
	STA FNADR+1
	LDA #<ISYM
	STA FNADR
	RTS




; LIB ***

HLIB	BIT SFILE
	BVC DLIB1       ;NOT ALREADY IN .LIB
	LDA #>LIBERR
	LDY #<LIBERR
	JSR WSCRN
	JMP DONE

DLIB1	JSR NFILE       ;PARSE PARMS
	LDA #3
	STA LA
	STA SA
	LDA #8
	STA FA
	JSR OPEN
	JSR FTEST
	LDA #$40
	ORA SFILE
	STA SFILE       ;FLAG IN .LIB
	JMP ENDR

.PAGE
; .IFN AND .IFE ***
;
; SYNTAX FOR CONDTIONAL ASSEMBLEY
; IS AS FOLLOWS:
;
;  .IFE EXPR <
;
; WHERE .IFE(.IFN)IS THE DIRECTIVE
; MEANING IF EQU AND IF NOT EQU.
; EXPR IS A VALID EXPRESSION
;     (NO FORWARD REFERENCES).
; & < IS THE START OF AN IF RANGE
;             (ON SAME CARD).
;
; & RANGE IS TERMINATED BY > CHR
; IN THE FIRST COL. OF A CARD.
; THE TERMINATOR CARD MUST BE IN
; THE SAME FILE AS THE IF STTMNT.


HIFN	LDA #$FF        ;NOT EQUAL FLAG
	.BYTE $2C

HIFE	LDA #$00        ;EQUAL FLAG
	STA IFFLAG

	JSR NFNDNB      ;FIND NEXT NON BLANK
	BCC RANOFF      ;RAN OFF END OF CARD.
	STY CHAR
	LDX ICSB        ;INDEX INTO CARD
	JSR EVAL        ;EVAL. THE EXPRESSION
	DEC RETURN      ;SIMPLER TESTING
	BMI HSET        ;GOOD RETURN
	BEQ HUNDEF      ;UNDEFINED SOMETHING
	JMP NOEVAL      ;COULD NOT EVAL...

; LOOK FOR '< , TEST EXPR AND EXECUTE RESULT

HSET	STX ICOLP       ;NEW PNTR IN LINE
	JSR NFNDNB      ;SKIP BLANKS
	BCC RANOFF      ;NOT THERE
	CMP #'<'        ;CHECK FOR RIGHT CHAR.
	BEQ HOK         ;FOUND IT
	JMP RANOFF      ;BAD DIRECTIVE

HOK	LDY #$FF        ;SET Y TO INVERSE
	LDA IEXP        ;GET VALUE OF EXPR
	ORA IEXP+1
	BEQ TSTFLG
	LDY #$00
TSTFLG	TYA
	EOR IFFLAG      ;TACK IN THE FLAG
	BNE HDONE       ;FALSE CONDITION ASMB

; EAT SOURCE UNTIL '> IS FOUND.

GETMOR	JSR NEWCHR      ;GET A CHAR.
	CMP #$0D        ;RETURN CHAR?
	BNE GETMOR

	JSR NEWCHR      ;IF NEXT CARD STARTS WITH > THEN STOP
	CMP #'>'
	BNE GETMOR
XXXS	JSR NEWCHR
	CMP #$0D
	BNE XXXS

HDONE	JMP ENDLN       ;FINISHED...

;
; ERRORS AND SUBROUTINES FOR IF'S
;

HUNDEF	LDA PASS        ;PASS 1 OR 2 ?
	BNE NOTDEF
	LDA #11         ;FOWARD REF ERROR
	.BYTE $2C

NOTDEF	LDA #01         ;NOT DEFINED
	.BYTE $2C

RANOFF	LDA #07         ;RAN OFF CARD
	.BYTE $2C

NOEVAL	LDA #13         ;CAN'T EVAL EXPR..
	LDX ICSE        ;POINTER INTO CARD
	LDY #$00        ;NUM OF BYTES GENERATED
	JMP LTS1

NEWCHR	JSR GETCHR      ;GET A CHAR.
	CMP #$00        ;EOF ?
	BEQ NOEND       ;END MISSING
	RTS

NOEND	JMP H10

.END