NEW
  AUTO 3,1
				.LIST OFF
*--------------------------------------
* In: A = current CHAR
* Out: CC, int16 on stack or pSTR in stack
*--------------------------------------
EXP.Eval		stz EXP.TYPE

EXP.Eval.R		lda EXP.AOPS
				pha

				lda #$FF
				>PUSHA					Previous OP = none
*--------------------------------------
.10				jsr CORE.GetCharNB
				bcs .39

.11				cmp #'('
				bne .12

				jsr CORE.GetNextCharNB	skip (
				bcs .39

				jsr EXP.Eval.R
				bcs .39

				jsr CORE.GetCharNB
				bcs .39

				cmp #')'
				sec
				bne .39

				jsr CORE.GetNextCharNB	skip )
				bra .41

.12				cmp #'"'
				bne .20

				jsr EXP.CreateStrConst
				bcs .37

				bra .40
*--------------------------------------
.20				jsr CORE.IsLetter
				bcs .30					No, go check for number...

				>LDYA L.ACOS.KW			Yes, KW, FN or VAR ?
				jsr CORE.Lookup
				bcc .80					KW, end of exp

				>LDYA L.ACOS.FN
				jsr CORE.LookupSkip
				bcs .21

				jsr EXP.FNjmpX

				bcs .99
				bra .40

.21				jsr EXP.VARLookup
				bcs .37

				ldy EXP.ADDR
				ldx EXP.ADDR+1
				jsr CODE.LDYXI

				ldx EXP.TYPE
				bne .22

				ldx #RT.IntGet.ID
				bra .23
				
.22				ldx #RT.StrGet.ID

.23				jsr CODE.JSRRT
				bra .40
*--------------------------------------
.30				jsr CORE.IsDigit10
.39				bcs .90

				jsr EXP.Int16
.37				bcs .99
*--------------------------------------
.40				jsr CORE.GetCharNB
.41				bcs .80

.50				jsr CORE.IsEndExp
				bcs .80

				jsr CORE.IsKW
				bcc .80

				jsr CORE.LookupOPS
				bcs .90

				stx EXP.AOPS

				lda (pStack)			get op context
				bmi .60					no prev op, go get arg2

				cmp EXP.AOPS			we have arg1 A=op1 arg2 X=op2
				bcc .60

				inc pStack				prev op has precedence

				tay
				jsr EXP.ComputeY		go compute (arg1 op1 arg2)
				bcs .90

.60				lda EXP.AOPS			we must compute arg2 op2 arg3 before
				>PUSHA

				jsr CORE.GetCharNB
				bcs .90
				jmp .11
*--------------------------------------
.80				>PULLA
				tay
				bmi .88					nothing to do

				jsr EXP.ComputeY		go compute (arg1 op1 arg2)
				bcc .80

.90				lda #E.ESYN

.99				tay						Save Err code

.98				>PULLA
				tax
				bpl .98

				sec
				.HS 90					BCC
.88				clc

				pla
				sta EXP.AOPS

				tya

				rts
*--------------------------------------
EXP.FNjmpX		 jmp (J.ACOS.FN,x)
*--------------------------------------
EXP.CreateStrConst
				lda #'$'
				sta EXP.TYPE

				ldy #0

.1				jsr CORE.GetNextChar
				bcs .91

				cmp #'"'
				beq .2

				sta (ZPConstBufPtr),y
				iny
				bne .1

.2				lda #0
				sta (ZPConstBufPtr),y

				phy
				ldy ZPConstBufPtr
				ldx ZPConstBufPtr+1
				jsr CODE.PUSHYXI

				pla
				sec						for \0
				adc ZPConstBufPtr
				sta ZPConstBufPtr
				bcc .3

				inc ZPConstBufPtr+1

.3				jsr CORE.GetNextCharNB	skip "

				clc
				rts

.91				lda #E.ESYN
*				sec
				rts
*--------------------------------------
EXP.Int16		>PUSHW ZPInputBufPtr
				>PUSHWI ZPInputBufPtr
				>PUSHBI 10
				>SYSCALL StrToL
				bcs .9

				jsr CODE.PUSHINT16

				>POP 4

				clc

.9				rts
*--------------------------------------
EXP.VARLookup	>LDA.G hVars

				>PUSHA
				>PUSHA					for SListGetData/SListAddData

				>PUSHW ZPInputBufPtr
				>SYSCALL SListLookup
				bcs .3

				>PUSHYA					KeyID

				txa
				jsr CORE.SkipA

.1				>PUSHWI EXP.ADDR
				>PUSHWI 3				3 bytes : ADDR + TYPE
				>PUSHWZ					From Start
				>SYSCALL SListGetData
				bcs .99

				jsr CORE.GetVarType

				cpx EXP.TYPE
				bne .90

				clc
				rts

.90				lda #E.TMISMATCH
				sec
.99				rts
*--------------------------------------
.3				jsr CORE.NewVarKey
				bcs .9

				>PUSHYA 					SID

				jsr CORE.GetVarType
				stx EXP.TYPE

				beq .4

				jsr CORE.GetStr
				bra .5

.4				jsr CORE.GetWord
.5				>STYA EXP.ADDR

				>PUSHWI EXP.ADDR
				>PUSHWI 3				3 bytes : ADDR + TYPE
				>SYSCALL SListAddData

				rts
				
.9				inc pStack				discard extra hVars
				rts
*--------------------------------------
EXP.ComputeY	lda EXP.TYPE

				bne .1

				ldx ACOS.OPS2FPU,y
				jsr CODE.FPUCALL
				clc
				rts
				
.1				stz EXP.TYPE			at the end ....TRUE/FALSE is int
	
				cpy #3					+
				bne .2
				
				ldx #SYS.StrCat
				clc
				jmp CODE.SYSCALL

.2				cpy #11					<>
				bne .3
				
				ldx #SYS.StrCmp
				clc
				jmp CODE.SYSCALL
				
.3				cpy #13					=
				bne .9
								
				ldx #SYS.StrCmp
				jsr CODE.SYSCALL

				ldx #RT.NOT.ID
				clc
				jmp CODE.JSRRT	

.9				sec
				rts
*--------------------------------------
MAN
SAVE usr/src/bin/acos.s.exp
LOAD usr/src/bin/acos.s
ASM