( REPL )

|00 @System &vector $2 &wst $1 &rst $1 &pad $4 &r $2 &g $2 &b $2
|10 @Console &vector $2 &read $1 &pad $5 &write $1
|20 @Screen &vector $2 &width $2 &height $2 &auto $1 &pad $1 &x $2 &y $2 &addr $2 &pixel $1 &sprite $1
|80 @Controller &vector $2 &button  $1 &key $1
|90 @Mouse &vector $2 &x $2 &y $2 &state $1 &chord $1
|a0 @File &vector $2 &success $2 &offset $2 &pad $2 &name $2 &length $2 &load $2 &save $2

|0000

	@input $80
	@token $40
	@p &ptr $2 &len $2

|0100 ( -> )

	( theme )
	#0f5f .System/r DEO2
	#0fcd .System/g DEO2
	#0fa3 .System/b DEO2
	#15 .Screen/auto DEO
	( vectors )
	;on-button .Controller/vector DEO2
	( draw )
	#01 ;draw-input JSR2
	#01 ;draw-stack JSR2

BRK

@on-button ( -> )

	.Controller/key DEI
	[ #0d ] EQUk NIP ,&validate JCN
	[ #08 ] EQUk NIP ,&erase JCN
	[ #20 ] LTHk NIP ,&end JCN
	[ #7e ] GTHk NIP ,&end JCN
	;input ;slen JSR2 NIP #80 LTH ,&append JCN
	&end
	POP

BRK
	&append ( char -> ) #00 ;draw-input JSR2 ;input ;sput JSR2 #01 ;draw-input JSR2 BRK
	&erase ( char -> ) #00 ;draw-input JSR2 ;input ;spop JSR2 #01 ;draw-input JSR2 BRK
	&validate ( char -> ) #00 ;draw-input JSR2 ;input ;sput JSR2 ;input ;parse JSR2 ;input #0080 ;mclr JSR2 BRK

@parse ( addr* -- )

	#00 ;draw-stack JSR2

	&while
		LDAk #20 GTH ,&no-space JCN
			;do-token JSR2
			,&continue JMP
			&no-space
		LDAk ;token ;sput JSR2
		&continue
		INC2 LDAk ,&while JCN
	POP2
	#01 ;draw-program JSR2

	( set return )
	;&end ;write-litshort JSR2 #2c ;write-byte JSR2
	( time to evaluate program )
	( borrow wst ) #ff .System/wst DEO
	;dst JMP2
	&end
	( released wst ) #00 .System/wst DEO
	#01 ;draw-stack JSR2
	
	;dst .p/len LDZ2 #0004 ADD2 ;mclr JSR2
	#0000 .p/len STZ2
	#0000 .p/ptr STZ2

JMP2r

@do-token ( -- )

	;token LDAk LIT '# NEQ ,&no-lithex JCN
		DUP2 INC2 ;do-lithex JSR2 ,&end JMP
		&no-lithex
	DUP2 ;is-opcode JSR2 #00 EQU ,&no-opcode JCN
		DUP2 ;find-opcode JSR2 ;write-byte JSR2
		&no-opcode
	&end
	POP2
	;token #0040 ;mclr JSR2

JMP2r

@is-opcode ( string* -- flag )

	DUP2 ;opcodes/brk ,scmp3 JSR ,find-opcode/on-brk JCN

@find-opcode ( name* -- byte )

	STH2
	#2000
	&loop
		#00 OVR #03 MUL ;opcodes ADD2 STH2kr ,scmp3 JSR ,&on-found JCN
		INC GTHk ,&loop JCN
	POP2 POP2r #00

JMP2r
	&on-found NIP STH2r ,find-mode JSR ADD JMP2r
	&on-brk POP2 #01 JMP2r

@find-mode ( mode* -- byte )

	LITr 00
	;opcodes OVR2 ,scmp3 JSR #70 SFT STH ADDr
	INC2 INC2 INC2
	LDAk #00 EQU ,&end JCN
	&while
		LDAk LIT '2 EQU #50 SFT STH ADDr
		LDAk LIT 'r EQU #60 SFT STH ADDr
		LDAk LIT 'k EQU #70 SFT STH ADDr
		INC2 LDAk ,&while JCN
	&end
	POP2 STHr

JMP2r

@scmp3 ( a[3]* b[3]* -- flag )

	LDA2k STH2 INC2 INC2 SWP2
	LDA2k STH2 INC2 INC2 EQU2r
	LDA STH LDA STH EQUr
	ANDr STHr

JMP2r

@do-lithex ( t* -- )

	DUP2 ;slen JSR2 #0004 EQU2 ,&on-short JCN
	DUP2 ;slen JSR2 #0002 EQU2 ,&on-byte JCN

;err/lithx ;print-err JMP2

	&on-short ;sshort JSR2 ;write-litshort JMP2
	&on-byte ;sbyte JSR2 ;write-litbyte JMP2

@write-litbyte ( byte -- )

	( LITk ) #80 SWP ,write-short JMP

@write-litshort ( short* -- )

	( LIT2k ) #a0 ,write-byte JSR

@write-short ( short -- )

	SWP ,write-byte JSR

@write-byte ( byte -- )

	;dst .p/ptr LDZ2 STH2k ADD2 STA
	INC2r STH2kr .p/ptr STZ2
	STH2r .p/len STZ2

JMP2r

( drawing )

@draw-input ( color -- )

	STH
	( flower )
	#0010 .Screen/x DEO2
	#0020 .Screen/y DEO2
	;flowers-icn #00 ;input ;slen JSR2 ADD #06 DIVk MUL SUB #50 SFT2 ADD2 .Screen/addr DEO2
	#81 .Screen/sprite DEO
	#00 .Screen/sprite DEO
	;prompt-txt #02 ;draw-str JSR2
	;input #01 STHr MUL ;draw-str JSR2

JMP2r

@draw-stack ( color -- )

	STH
	( position )
	#0020 .Screen/x DEO2
	#0050 .Screen/y DEO2
	;stack-txt #02 ;draw-str JSR2
	#ffff LDA #ff00 STHr ,draw-memory JSR

JMP2r

@draw-program ( color -- )

	STH
	#0020 .Screen/x DEO2
	#0090 .Screen/y DEO2
	;program-txt #02 ;draw-str JSR2
	#10 ;dst STHr ,draw-memory JSR

JMP2r

@draw-memory ( length addr* color -- )
	
	STH
	,&addr STR2
	.Screen/x DEI2 ,&anchor STR2
	#00
	&loop
		DUP #07 AND ,&no-lb JCN
			[ LIT2 &anchor $2 ] .Screen/x DEO2
			.Screen/y DEI2k #0010 ADD2 ROT DEO2
			&no-lb
		#00 OVR [ LIT2 &addr $2 ] ADD2 LDA #01 STHkr MUL ,draw-byte JSR
		.Screen/x DEI2k #0008 ADD2 ROT DEO2
		INC GTHk ,&loop JCN
	POP2
	POPr

JMP2r

@draw-short ( short* color -- )

	STH SWP STHkr ,draw-byte JSR STHr

@draw-byte ( byte color -- )

	STH DUP #04 SFT STHkr ,draw-hex JSR #0f AND STHr

@draw-hex ( char color -- )

	SWP #0f AND [ DUP #09 GTH #07 MUL ADD #30 ADD ] SWP

@draw-char ( char color -- )

	SWP #20 SUB #00 SWP #40 SFT2 ;font ADD2 .Screen/addr DEO2
	.Screen/sprite DEO

JMP2r

@draw-str ( text* color -- )

	STH
	&while
		LDAk STHkr ,draw-char JSR
		INC2 LDAk ,&while JCN
	POP2
	POPr

JMP2r

( utils )

@slen ( str* -- len* )

	DUP2 ,scap JSR SWP2 SUB2

JMP2r

@scap ( str* -- end* )

	LDAk #00 NEQ JMP JMP2r
	&while INC2 LDAk ,&while JCN

JMP2r

@sput ( char str* -- )

	,scap JSR STA

JMP2r

@spop ( str* -- )

	LDAk ,&no-null JCN
		POP2 JMP2r &no-null
	#00 ROT ROT ,scap JSR #0001 SUB2 STA

JMP2r

@chex ( char -- value )

	DUP #2f GTH OVR #3a LTH AND ,&number JCN
	DUP #60 GTH OVR #67 LTH AND ,&lc JCN
		POP #00

JMP2r
	&number #30 SUB JMP2r
	&lc #57 SUB JMP2r

@mclr ( addr* len* -- )

	OVR2 ADD2 SWP2
	&loop
		STH2k #00 STH2r STA
		INC2 GTH2k ,&loop JCN
	POP2 POP2

JMP2r

@print ( short* -- )

	&short ( short* -- ) SWP ,&byte JSR
	&byte ( byte -- ) DUP #04 SFT ,&char JSR
	&char ( char -- ) #0f AND DUP #09 GTH #27 MUL ADD #30 ADD #18 DEO

JMP2r

@sshort ( str* -- short* )

	INC2k INC2 ,sbyte JSR STH
	,sbyte JSR STHr

JMP2r

@sbyte ( str* -- byte )

	LDAk ,chex JSR STH
	INC2 LDA ,chex JSR
	STHr #40 SFT ADD

JMP2r

@print-err ( token* err* -- )

	LIT '! .Console/write DEO
	SWP2 ,print-str JSR #2018 DEO

@print-str ( str* -- )

	&while
		LDAk #18 DEO
		INC2 LDAk ,&while JCN
	POP2

JMP2r

( assets )

@prompt-txt "Do 20 $1
@stack-txt "Stack 20 $1
@program-txt "Program 20 $1

@opcodes
	"LIT "INC "POP "DUP "NIP "SWP "OVR "ROT
	"EQU "NEQ "GTH "LTH "JMP "JCN "JSR "STH
	"LDZ "STZ "LDR "STR "LDA "STA "DEI "DEO
	"ADD "SUB "MUL "DIV "AND "ORA "EOR "SFT
	&brk "BRK

@err
	&lithx "LITHX $1 &label "LABEL $1 &token "TOKEN $1 &reslv "RESLV $1

@flowers-icn ( by elioat )
	0000 0020 1408 0810 40a0 4205 0200 40a0
	0810 103c 7e7e 3c18 4205 0234 7e7e 3c18
	0000 0020 100c 0818 0040 a042 0522 5024
	0008 083c 7e7e 3c18 0a04 002c 7e7e 3c18
	0000 0000 0000 000c 0000 0000 0000 0000
	1c10 083c 7e7e 3c18 0000 002c 7e7e 3c18
	0000 0000 0000 0004 0000 0000 0002 0502
	0810 103c 7e7e 3c18 0000 0034 7e7e 3c18
	0000 0000 0000 0010 0000 0000 0020 5225
	080c 083c 7e7e 3c18 0200 002c 7e7e 3c18
	0000 0000 0800 1800 0000 040a 2450 240a
	1010 103c 7e7e 3c18 0400 0034 7e7e 3c18

@font ( msx816 )
	0000 0000 0000 0000 0000 0000 0000 0000
	0000 0020 2020 2020 2020 0000 2020 0000
	0000 006c 6c24 4800 0000 0000 0000 0000
	0000 0044 44fe 4444 4444 44fe 4444 0000
	0000 1010 7c92 9290 7c12 9292 7c10 1000
	0000 0040 a0a2 4408 1020 448a 0a04 0000
	0000 0070 8888 8850 2050 8a84 8c72 0000
	0000 0030 3010 2000 0000 0000 0000 0000
	0000 0004 0808 1010 1010 1008 0804 0000
	0000 0040 2020 1010 1010 1020 2040 0000
	0000 0000 0000 1054 3854 1000 0000 0000
	0000 0000 0010 1010 fe10 1010 0000 0000
	0000 0000 0000 0000 0000 0030 3010 2000
	0000 0000 0000 0000 fe00 0000 0000 0000
	0000 0000 0000 0000 0000 0000 3030 0000
	0000 0000 0002 0408 1020 4080 0000 0000
	( numbers )
	0000 0038 4482 8292 9292 8282 4438 0000
	0000 0010 3050 1010 1010 1010 1038 0000
	0000 0038 4482 8202 0c30 4080 80fe 0000
	0000 0038 4482 0204 3804 0282 4438 0000
	0000 0004 0c14 1424 2444 44fe 0404 0000
	0000 00fc 8080 80b8 c402 0282 4438 0000
	0000 0038 4482 80b8 c482 8282 4438 0000
	0000 00fe 8284 0808 1010 1010 1010 0000
	0000 0038 4482 8244 3844 8282 4438 0000
	0000 0038 4482 8282 463a 0282 4438 0000
	0000 0000 0000 3030 0000 0030 3000 0000
	0000 0000 0000 3030 0000 0030 3010 2000
	0000 0000 0408 1020 4020 1008 0400 0000
	0000 0000 0000 00fe 0000 fe00 0000 0000
	0000 0000 4020 1008 0408 1020 4000 0000
	0000 0038 4482 8202 0c10 1000 1010 0000
	0000 0038 4482 0262 9292 9292 926c 0000
	0000 0010 2844 8282 8282 fe82 8282 0000
	0000 00f8 8482 8284 f884 8282 84f8 0000
	0000 0038 4482 8080 8080 8082 4438 0000
	0000 00f8 4442 4242 4242 4242 44f8 0000
	0000 00fe 8080 8080 fc80 8080 80fe 0000
	0000 00fe 8080 8080 fc80 8080 8080 0000
	0000 0038 4482 8080 8e82 8282 463a 0000
	0000 0082 8282 8282 fe82 8282 8282 0000
	0000 0038 1010 1010 1010 1010 1038 0000
	0000 000e 0404 0404 0404 0484 8870 0000
	0000 0082 8488 90a0 c0a0 9088 8482 0000
	0000 0040 4040 4040 4040 4040 407e 0000
	0000 0082 c6aa 9292 8282 8282 8282 0000
	0000 0082 c2a2 a292 928a 8a86 8282 0000
	0000 0038 4482 8282 8282 8282 4438 0000
	0000 00f8 8482 8282 84f8 8080 8080 0000
	0000 0038 4482 8282 8282 bac6 443a 0000
	0000 00f8 8482 8284 f890 8884 8482 0000
	0000 0038 4482 8040 3804 0282 4438 0000
	0000 00fe 1010 1010 1010 1010 1010 0000
	0000 0082 8282 8282 8282 8282 827c 0000
	0000 0082 8282 8282 8282 8244 2810 0000
	0000 0082 8282 8282 9292 aaaa 4444 0000
	0000 0082 8282 4428 1028 4482 8282 0000
	0000 0082 8282 4428 1010 1010 1010 0000
	0000 00fe 0202 0408 1020 4080 80fe 0000
	0000 001c 1010 1010 1010 1010 101c 0000
	0000 0082 4428 10fe 1010 fe10 1010 0000
	0000 0070 1010 1010 1010 1010 1070 0000
	0000 0010 2844 8200 0000 0000 0000 0000
	0000 0000 0000 0000 0000 0000 00fe 0000
	0000 0060 6020 1000 0000 0000 0000 0000
	0000 0000 0000 7884 047c 8484 8c74 0000
	0000 0040 4040 5864 4242 4242 6458 0000
	0000 0000 0000 3844 8280 8082 4438 0000
	0000 0004 0404 344c 8484 8484 4c34 0000
	0000 0000 0000 3844 82fe 8082 4438 0000
	0000 0018 2420 7820 2020 2020 2020 0000
	0000 0000 0000 3a46 8282 8246 3a82 4438
	0000 0040 4040 5864 4242 4242 4242 0000
	0000 0010 1000 0010 1010 1010 1010 0000
	0000 0008 0800 0008 0808 0808 0808 4830
	0000 0040 4040 4244 4850 7048 4442 0000
	0000 0030 1010 1010 1010 1010 1010 0000
	0000 0000 0000 ec92 9292 9292 9292 0000
	0000 0000 0000 5c62 4242 4242 4242 0000
	0000 0000 0000 3844 8282 8282 4438 0000
	0000 0000 0000 5864 4242 4242 6458 4040
	0000 0000 0000 344c 8484 8484 4c34 0404
	0000 0000 0000 5864 4040 4040 4040 0000
	0000 0000 0000 7c82 807c 0202 827c 0000
	0000 0020 2020 f820 2020 2020 2418 0000
	0000 0000 0000 8484 8484 8484 8c74 0000
	0000 0000 0000 8282 4444 2828 1010 0000
	0000 0000 0000 8282 8292 92aa 4444 0000
	0000 0000 0000 8244 2810 1028 4482 0000
	0000 0000 0000 4242 4242 4222 1408 1060
	0000 0000 0000 fe04 0810 2040 80fe 0000
	0000 000c 1010 1010 2010 1010 100c 0000
	0000 1010 1010 0000 0000 1010 1010 0000
	0000 0060 1010 1010 0810 1010 1060 0000
	0000 0060 920c 0000 0000 0000 0000 0000

@dst