mirror of
https://git.sr.ht/~rabbits/uxn
synced 2024-11-05 22:05:04 +00:00
155 lines
3.2 KiB
Tal
155 lines
3.2 KiB
Tal
( thue interpreter
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usage: thue.rom demo.t )
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|10 @Console &vector $2 &read $1 &pad $5 &write $1
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|a0 @File &vector $2 &success $2 &stat $2 &delete $1 &append $1 &name $2 &length $2 &read $2 &write $2
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|0000
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@src $40
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@ptr $2
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@len $2
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|0100 ( -> )
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;on-console .Console/vector DEO2
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BRK
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@on-console ( -> )
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;src STH2
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( read )
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.Console/read DEI
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DUP #20 LTH OVR #7f GTH ORA ,&end JCN
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STH2kr ;slen JSR2 #003f GTH2 ,&end JCN
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STH2r ;sput JSR2 BRK
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&end
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POP
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( parse )
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STH2r .File/name DEO2
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#0001 .File/length DEO2
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;program .ptr STZ2
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&s
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;&buf .File/read DEO2
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.File/success DEI2 #0000 EQU2 ,&eof JCN
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[ LIT &buf $1 ] ;walk JSR2
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,&s JMP
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&eof
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( assemble )
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;program/assembly .ptr STZ2
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;program
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&w
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( save ) DUP2 .ptr LDZ2 STA2
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( incr ) .ptr LDZ2k INC2 INC2 ROT STZ2
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( next ) &eos INC2 LDAk ,&eos JCN INC2
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LDAk ,&w JCN
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( save acc )
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INC2 ;program/accumulator ;scpy JSR2
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( run )
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&eval ,step JSR ,&eval JCN
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#010f DEO
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BRK
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@step ( -- done )
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;program/assembly
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&while
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DUP2 ;run-rule JSR2 ,&found JCN
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#0004 ADD2 LDA2k ORA ,&while JCN
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POP2
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#00
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JMP2r
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&found #01 JMP2r
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@walk ( char -- )
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.ptr LDZ2 STA
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( check for left-side )
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.ptr LDZ2 #0002 SUB2 ;&marker ;scmp JSR2 #01 NEQ ,&no-marker JCN
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#00 .ptr LDZ2 #0002 SUB2 STA
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.ptr LDZ2k #0002 SUB2 ROT STZ2
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.len LDZ2k INC2 ROT STZ2
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&no-marker
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( check for right-side )
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.ptr LDZ2 LDA #0a NEQ ,&no-lb JCN
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#00 .ptr LDZ2 STA
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&no-lb
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.ptr LDZ2k INC2 ROT STZ2
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JMP2r
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&marker "::= $1
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@run-rule ( rule* -- )
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LDA2k ,&a STR2
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INC2 INC2 LDA2 ,&b STR2
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;program/accumulator
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&w
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[ LIT2 &a $2 ] OVR2 ;sseg JSR2 #01 NEQ ,&no-found JCN
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,&b LDR2 LDA LIT "~ EQU ,&output JCN
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( shift ) DUP2 [ ,&b LDR2 ;slen JSR2 ,&a LDR2 ;slen JSR2 SUB2 ] ;ssft JSR2
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( write ) [ LIT2 &b $2 ] SWP2 OVR2 ;slen JSR2 ;mcpy JSR2
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POP2 #01 JMP2r
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&no-found
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INC2 LDAk ,&w JCN
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POP2
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#00
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JMP2r
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&output
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,&a LDR2 ;slen JSR2 #0000 SWP2 SUB2 ;ssft JSR2
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POP2 ,&b LDR2 INC2
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LDAk LIT "` NEQ ,&no-lb JCN
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#0a18 DEO #01 JMP2r
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&no-lb
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,print-str JSR #01
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JMP2r
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@print-str ( str* -- )
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&while
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LDAk #18 DEO
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INC2 LDAk ,&while JCN
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POP2
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JMP2r
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@ssft ( str* len* -- )
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STH2 DUP2k ;slen JSR2 ADD2 STH2r
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DUP2 #8000 GTH2 ,&l JCN
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ORAk ,&r JCN
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POP2 POP2 POP2
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JMP2r
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&l #8000 SWP2 SUB2 #8000 ADD2 ,msfl JSR JMP2r
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&r ,msfr JSR JMP2r
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( stdlib )
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@mcpy ( src* dst* len* -- ) SWP2 STH2 OVR2 ADD2 SWP2 &l LDAk STH2kr STA INC2r INC2 GTH2k ,&l JCN POP2 POP2 POP2r JMP2r
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@msfl ( b* a* len* -- ) STH2 SWP2 EQU2k ,&e JCN &l DUP2k STH2kr ADD2 LDA ROT ROT STA INC2 GTH2k ,&l JCN POP2 POP2 &e POP2r JMP2r
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@msfr ( b* a* len* -- ) STH2 EQU2k ,&e JCN &l DUP2 LDAk ROT ROT STH2kr ADD2 STA #0001 SUB2 LTH2k ,&l JCN POP2 POP2 &e POP2r JMP2r
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@scap ( str* -- end* ) LDAk #00 NEQ JMP JMP2r &w INC2 LDAk ,&w JCN JMP2r
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@sput ( chr str* -- ) ,scap JSR STA JMP2r
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@slen ( str* -- len* ) DUP2 ,scap JSR SWP2 SUB2 JMP2r
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@scpy ( src* dst* -- ) STH2 &w LDAk STH2kr STA INC2r INC2 LDAk ,&w JCN POP2 #00 STH2r STA JMP2r
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@scmp ( a* b* -- f ) STH2 &l LDAk LDAkr STHr ANDk #00 EQU ,&e JCN NEQk ,&e JCN POP2 INC2 INC2r ,&l JMP &e NIP2 POP2r EQU JMP2r
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@sseg ( a* b* -- f ) STH2 &l LDAk LDAkr STHr NEQ ,&e JCN INC2k LDA #00 EQU ,&e JCN INC2 INC2r ,&l JMP &e LDA LDAr STHr EQU JMP2r
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$10
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@program $4000
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&assembly $4000
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&accumulator $4000
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