271 lines
3.8 KiB
Forth
271 lines
3.8 KiB
Forth
76 EMIT 111 EMIT 97 EMIT 100 EMIT 105 EMIT 110 EMIT 103 EMIT 32 EMIT
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112 EMIT 114 EMIT 101 EMIT 108 EMIT 117 EMIT 100 EMIT 101 EMIT 32 EMIT
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: \ KEY 10 = 0BRANCH [ -20 , ] ; IMMEDIATE \ Now we have line comments :)
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\ We'll periodically sprinkle these in so that it's clear to the user
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\ that things are happening.
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46 EMIT
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\ Conditionals
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: IF
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LIT 0BRANCH ,
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HERE @ 0 ,
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; IMMEDIATE
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: THEN
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DUP HERE @ SWAP -
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SWAP !
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; IMMEDIATE
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: ELSE
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LIT BRANCH ,
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HERE @ 0 ,
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SWAP
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DUP HERE @ SWAP -
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SWAP !
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; IMMEDIATE
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46 EMIT
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\ Loops
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: BEGIN HERE @ ; IMMEDIATE
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: UNTIL
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LIT 0BRANCH ,
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HERE @ - ,
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; IMMEDIATE
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: AGAIN
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LIT BRANCH ,
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HERE @ - ,
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; IMMEDIATE
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46 EMIT
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\ Recursive calls
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: RECURSE LATEST @ >CFA , ; IMMEDIATE
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\ Block comments (with nesting)
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: (
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BEGIN
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KEY DUP
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40 = IF RECURSE THEN
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41 =
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UNTIL
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; IMMEDIATE
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( ( Take that, C ) )
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46 EMIT
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\ Peripheral register addresses
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: TXBUF 0 ;
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: RXBUF 32 ;
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: TXHEAD 64 ;
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: TXTAIL 65 ;
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: RXHEAD 66 ;
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: RXTAIL 67 ;
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: SYSREADY 68 ;
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46 EMIT
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\ Printing utilities
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: CR 10 EMIT ;
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: SPACE 32 EMIT ;
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: CHAR
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KEY
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STATE @ 0<> IF
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LIT LIT , , \ Append LIT <key> to definition if compiling
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THEN
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; IMMEDIATE
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: EMIT-DIGIT
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DUP 10 < IF CHAR 0 ELSE CHAR A THEN
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+ EMIT
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;
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CHAR . EMIT
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: .
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\ Handle negatives
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DUP 0< IF CHAR - EMIT NEGATE THEN
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\ Determine starting place value
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1 BEGIN BASE @ * 2DUP / 0= UNTIL
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\ Print leading non-zero digits
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BEGIN
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BASE @ /
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2DUP / EMIT-DIGIT
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TUCK MOD SWAP
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OVER 0=
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UNTIL
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\ Print any trailing zeros
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BASE @ /
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DUP 0<> IF
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BEGIN CHAR 0 EMIT BASE @ / 0= UNTIL
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THEN
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2DROP
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;
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CHAR . EMIT
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: TYPE ( addr len -- )
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BEGIN
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DUP 0= IF 2DROP EXIT THEN
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SWAP DUP C@ EMIT 1+
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SWAP 1-
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AGAIN
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;
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CHAR . EMIT
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: C, HERE @ C! 1 HERE +! ;
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: ."
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STATE @ IF
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LIT BRANCH , \ Compile BRANCH for jumping over string data
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HERE @ 0 , \ Compile placeholder offset and push offset cell address
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0 BEGIN
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KEY
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DUP CHAR " = IF
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DROP
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HERE @ ALIGN HERE ! \ Pad to alignment
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SWAP DUP HERE @ SWAP - \ Compute offset
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OVER ! \ Update branch offset to skip data
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4+ LIT LIT , , \ Append LIT <addr>
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LIT LIT , , \ Append LIT <len>
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LIT TYPE , \ Append TYPE
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EXIT
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THEN
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C, 1+ \ Write byte and increment length
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AGAIN
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ELSE
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BEGIN
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KEY
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DUP CHAR " = IF DROP EXIT THEN
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EMIT
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AGAIN
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THEN
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; IMMEDIATE
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CHAR . EMIT
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\ Misc utilities
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: NIP SWAP DROP ;
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: '
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WORD FIND DUP 0<> IF
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>CFA
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ELSE
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DROP WNFHOOK EXECUTE
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THEN
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;
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: [COMPILE] ' , ; IMMEDIATE
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CHAR . EMIT
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\ Constants, variables and values
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: CONSTANT
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WORD CREATE
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DOCOL ,
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LIT LIT ,
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,
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LIT EXIT ,
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;
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: VARIABLE
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WORD CREATE
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DOVAR ,
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0 ,
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;
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: VALUE
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WORD CREATE
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DOVAL , ,
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;
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: TO
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' 4+
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STATE @ IF
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LIT LIT , ,
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LIT ! ,
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ELSE
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!
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THEN
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; IMMEDIATE
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CHAR . EMIT
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\ A better word-not-found handler
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: ANY-RX? RXHEAD AC@ RXTAIL AC@ <> ;
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: WNF-HANDLER
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." Unknown word: "
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WORDBUF SWAP TYPE CR
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STATE @ IF
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\ Remove incomplete definition and switch back to interpret mode
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LATEST @ HERE !
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LATEST @ @ LATEST !
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[COMPILE] [
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THEN
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\ We only consume to the next newline if there is RX data available,
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\ because if the offending word was at the end of the line then the
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\ newline would have already been consumed by WORD.
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ANY-RX? IF BEGIN KEY 10 = UNTIL THEN
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QUIT
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;
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' WNF-HANDLER TO WNFHOOK
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CHAR . EMIT
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\ Version number
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: VERSION-MAJOR 0 ;
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: VERSION-MINOR 1 ;
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: VERSION-PATCH 0 ;
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: VERSION-PRINT
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." v" VERSION-MAJOR .
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." ." VERSION-MINOR .
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." ." VERSION-PATCH .
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;
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CHAR . EMIT
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\ Welcome banner
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: BANNER
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." _ __ " CR
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." _ __(_)__ ___ / / " CR
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." | |/|/ / / _ \_ (_-./ _ \" CR
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." |__,__/_/ .__(_)___/_//_/" CR
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." /_/ " CR
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CR
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." Wipforth " VERSION-PRINT CR
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CR
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;
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." done" CR
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BANNER
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\ Set SYSREADY high to indicate prelude has finished and enable user
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\ input on the JS side.
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1 SYSREADY AC!
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