nxu/repl-regex.tal

109 lines
2.9 KiB
Tal

( repl-regex.tal )
%dbg { #ff #0e DEO }
%sp { #20 #18 DEO }
%nl { #0a #18 DEO }
%exit { #01 #0f DEO BRK }
( read in regular expressions )
( and emit internal structures parsed )
|0100
;r-prompt ;println JSR2
;r-read-stdin #10 DEO2 BRK
( we use two different prompts depending on what mode we're in )
@r-prompt "enter 20 "regex: 20 00
@s-prompt "string 20 "to 20 "match: 20 00
@regex $2 ( compiled regex address (if any) )
@buffer $1000 ( buffer to read user input )
@ptr :buffer ( next byte to write in buffer )
@println ( s* -> )
&loop LDAk #00 EQU ,&eof JCN
LDAk #18 DEO INC2 ,&loop JMP
&eof POP2 JMP2r
@r-read-stdin ( -> )
#12 DEI #0a EQU ,&execute JCN
#12 DEI ;ptr LDA2 STA
;ptr LDA2k INC2 SWP2 STA2
BRK
&execute
#00 ;ptr LDA2 STA
;buffer ;ptr STA2
;buffer ;compile JSR2 dbg nl
DUP2 ;regex STA2
;emit-stack JSR2 nl
;emit-arena JSR2 nl
;reset-arena JSR2
POP2
;s-prompt ;println JSR2
;s-read-stdin #10 DEO2 BRK
BRK
@s-read-stdin ( -> )
#12 DEI #0a EQU ,&execute JCN
#12 DEI ;ptr LDA2 STA
;ptr LDA2k INC2 SWP2 STA2
BRK
&execute
#00 ;ptr LDA2 STA ( null terminate string )
;ptr LDA2 ;buffer EQU2 STH ( stash is-empty? )
;buffer ;ptr STA2 ( reset ptr )
;buffer ;regex LDA2 ;match JSR2 ( match regex )
;emit-byte JSR2 nl ( print result )
STHr ,&was-empty JCN
;s-prompt ;println JSR2
BRK
&was-empty
;r-prompt ;println JSR2
;r-read-stdin #10 DEO2 BRK
BRK
~regex.tal
@emit-short ( short* -- )
SWP ;emit-byte JSR2 ;emit-byte JSR2 JMP2r
@emit-byte ( byte^ -- )
DUP #04 SFT ,&hex JSR #0f AND ,&hex JMP
&hex #30 ADD DUP #39 GTH #27 MUL ADD emit!
JMP2r
( print stack size, followed by contents )
@emit-stack ( -> )
space LIT 'n emit! LIT '= emit! ;stack-pos LDA2 ;stack-bot SUB2 #0004 DIV2 ;emit-short JSR2 LIT ': emit!
;stack-bot
&loop
DUP2 ;stack-pos LDA2 LTH2 ,&ok JCN
POP2 newline JMP2r
&ok
space LDA2k ;emit-short JSR2
#0002 ADD2 ,&loop JMP
( emit n bytes from the given address )
@emit-n ( addr* count^ -> addr2* )
DUP #00 GTH ( addr count count>0? ) ,&ok JCN ( addr count ) POP newline JMP2r
&ok
STH ( addr [count] ) space LDAk ;emit-byte JSR2 INC2 ( addr+1 [count] )
STHr #01 SUB ( addr+1 count-1 )
;emit-n JMP2
( emit the arena, with one line per node )
( parses node type, since node size is dynamic (3-5). )
@emit-arena ( -> )
;arena-bot
&loop
DUP2 ;arena-pos LDA2 LTH2 ,&ok JCN POP2 JMP2r
&ok
DUP2 ;emit-short JSR2
LIT ': emit! space
LDAk #01 NEQ ,&!1 JCN #03 ;emit-n JSR2 ,&loop JMP
&!1 LDAk #02 NEQ ,&!2 JCN #03 ;emit-n JSR2 ,&loop JMP
&!2 LDAk #03 NEQ ,&!3 JCN #04 ;emit-n JSR2 ,&loop JMP
&!3 LDAk #04 NEQ ,&!4 JCN #05 ;emit-n JSR2 ,&loop JMP
&!4 LDAk #05 NEQ ,&!5 JCN #05 ;emit-n JSR2 ,&loop JMP
&!5 ;unknown-node-type ;error!! JSR2