rajamesandClaude Opus 5.5
0f82d8c22a
The ROM's source is F18 code in capsules/v4/rom, assembled off the node by v4/tools/mkrom.c with the memory map's constants from v4/tools/mkmap.c (MACHINE.md 2). main.f18 is the entry table payloads call through (2.1); in.f18 reads the console and splits it into tokens exactly as text.c does, the token held packed as a counted string. The ROM's state is a reserved area of the map (host_map.h ROM_*). text.c gains the constant directive, so the off-node assembler and the ROM speak one language. The map also names (NUMBER)'s state, for the next task. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
106 lines
3.3 KiB
Plaintext
106 lines
3.3 KiB
Plaintext
\ in.f18 -- the ROM's input: characters from the console, and tokens.
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\
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\ The text the ROM assembles arrives at the console's receive registers,
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\ a character at a time. The end of it is EOT (4), which the loader sends
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\ after the last blob. A token is what v4/src/text.c's next_token makes
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\ of the same text: blanks are space, tab, CR and LF; a token is at most 63
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\ characters; `\` as a whole token skips to the end of the line, and `(` as a
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\ whole token to the next `)`.
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\
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\ State, in the ROM's area of the memory map (MACHINE.md 2.1):
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\ (TOK) the token, as a counted string: its count byte, then its
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\ characters, four to a cell, low byte first, zero-padded --
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\ the form `",` lays down and (FIND) compares; 16 cells
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\ (TOKN) its length
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\ (PEEK) a character put back, plus one; 0: none
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\ (LINE) how many new lines have been read
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\ (EOF) non-zero once EOT has been read
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\ (FAILED) 0, or the code of the error that stopped the ROM
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\ (ERRLINE) (LINE) when it failed
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\ Every routine here uses A.
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\ ( -- c ) wait for a character, then take it
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: (KEY)
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W: CONSOLE-STATUS a! @ if Z drop CONSOLE-RX a! @ ;
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Z: drop jump W
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\ ( -- c ) the character put back, if there is one; else the next
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: (GETC)
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(PEEK) a! @ if NONE 0 ! -1 + ;
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NONE: drop jump (KEY)
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\ ( c -- ) put a character back, to be the next one read
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: (BACK) 1 + (PEEK) a! ! ;
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\ ( -- ) one more new line
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: (LF+) (LINE) a! @ 1 + ! ;
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\ ( code -- ) stop with an error, noting the line
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: (FAIL) (FAILED) a! ! (LINE) a! @ (ERRLINE) a! ! ;
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\ ( c -- ) one more character of the token: byte (TOKN)+1 of (TOK), into
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\ a cell whose byte there is still zero
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: (PUT)
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(TOKN) a! @ 1 +
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dup 2/ 2/ (TOK) + push
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3 and
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S: if SD push 2* 2* 2* 2* 2* 2* 2* 2* pop -1 + jump S
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SD: drop pop a! @ xor !
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(TOKN) a! @ 1 + ! ;
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\ ( i -- c ) character i of the token, from 0
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: (CHAR@)
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1 + dup 2/ 2/ (TOK) + a! @
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push 3 and
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S: if SD -1 + pop 2/ 2/ 2/ 2/ 2/ 2/ 2/ 2/ push jump S
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SD: drop pop 255 and ;
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\ ( -- len ) the next token into (TOK), its length into (TOKN). 0: the end,
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\ or an error, which is in (FAILED).
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: (TOKEN)
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(EOF) a! @ if GO drop 0 ;
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GO: drop
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SKIP: (GETC)
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dup 4 xor if END
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drop dup 10 xor if NL
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drop dup 32 xor if SP
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drop dup 9 xor if SP
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drop dup 13 xor if SP
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drop 0 (TOKN) a! !
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(TOK) a! 15 FOR 0 !+ NEXT
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READ: (TOKN) a! @ 63 xor if LONG
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drop (PUT) (GETC)
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dup 4 xor if TEND
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drop dup 10 xor if TEND
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drop dup 32 xor if TEND
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drop dup 9 xor if TEND
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drop dup 13 xor if TEND
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drop jump READ
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TEND: drop (BACK)
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(TOKN) a! @ (TOK) a! @ xor !
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(TOKN) a! @ 1 xor if ONE
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drop (TOKN) a! @ ;
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ONE: drop 0 (CHAR@)
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dup 92 xor if BSL
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drop dup 40 xor if PAREN
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drop drop 1 ;
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BSL: drop drop
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B1: (GETC)
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dup 10 xor if BEND
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drop dup 4 xor if BEND
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drop drop jump B1
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BEND: drop (BACK) jump SKIP
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PAREN: drop drop
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P1: (GETC)
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dup 41 xor if PCLOSE
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drop dup 10 xor if PNL
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drop dup 4 xor if PEOF
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drop drop jump P1
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PNL: drop drop (LF+) jump P1
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PCLOSE: drop drop jump SKIP
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PEOF: drop drop ERR-COMMENT (FAIL) 0 ;
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END: drop drop 1 (EOF) a! ! 0 ;
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NL: drop drop (LF+) jump SKIP
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SP: drop drop jump SKIP
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LONG: drop drop ERR-TOO-LONG (FAIL) 0 ;
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