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collapseos
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21 Commits

Author SHA1 Message Date
Virgil Dupras 764b2222c7 forth: replace (fbr?) by SKIP? 
This will allow us to support backward branching with just one new (bbr) word.
Also, this allow us to have "(" word sooned in core.fth and thus allow for
earlier commenting.
 2020-03-14 09:23:58 -04:00
Virgil Dupras 5b1ca474d4 forth: Add word "(" 
Also, fix "RECURSE" in IMMEDIATE contexts.
 2020-03-13 19:33:16 -04:00
Virgil Dupras d60ea4cb30 forth: Forth-ify RECURSE 
This comes with RS-modifying words. Also, this commit separates ";" from "EXIT",
allowing EXIT to be used in definitions (was needed for RECURSE).
 2020-03-13 16:40:55 -04:00
Virgil Dupras d0d92a4559 forth: Forth-ify IF and ELSE 
Now, I really need comments...
 2020-03-12 21:49:10 -04:00
Virgil Dupras d5a7d5faf8 forth: add words "(fbr)", "(fbr?)", "'", "[']" 2020-03-12 21:16:20 -04:00
Virgil Dupras fb54fd51af forth: implement THEN in Forth 
Also, add "," and "C,"
 2020-03-12 13:52:27 -04:00
Virgil Dupras f89e7bd503 forth: add words "C@" and "C!" 2020-03-11 22:11:54 -04:00
Virgil Dupras 80f63cd185 forth: add words "2DUP", "2SWAP", "2OVER" 2020-03-11 21:58:16 -04:00
Virgil Dupras 2ddca57f3f forth: add string and logic routines, as well as "RECURSE" 
The goal was to be able to implement "(" in forth, but I realised that my
INTERPRET approach was wrong. Compiling the line beforehand is, after all,
not good. I'll have to change it again.
 2020-03-10 16:02:40 -04:00
Virgil Dupras aac0a57a68 forth: add words "PC!" and "PC@" 2020-03-10 13:00:57 -04:00
Virgil Dupras 0b3f6253e4 forth: add support for IMMEDIATE words 2020-03-09 22:13:11 -04:00
Virgil Dupras 0e8af3cea4 forth: clarify the meaning of "wordref" 
Also, make entry labels in dict.asm be wordref instead of entry ref.
 2020-03-09 15:12:44 -04:00
Virgil Dupras e8a4768304 forth: add words "IF", "ELSE", "THEN" 2020-03-09 14:19:51 -04:00
Virgil Dupras 03e529b762 forth: simplify execution model and handle literals better 
This scheme of "when we handle line-by-line, compile one word at a time then
execute" so that we could allow words like "CREATE" to call "readword" before
continuing was a bad scheme. It made things like branching outside of a colon
definition impossible.

This commit implement a new "litWord". When an undefined word is encountered at
compile time, it is included as-is in a string literal word. It is at run time
that we decide what to do with it.
 2020-03-09 14:14:26 -04:00
Virgil Dupras 5cadde557c forth: add "VARIABLE" 2020-03-07 22:23:08 -05:00
Virgil Dupras 989d8bbabf forth: add "DOES>" and "CONSTANT" 2020-03-07 22:18:14 -05:00
Virgil Dupras 53024d88f5 forth: add "DUP", "OVER", "SWAP", "?", "+!", "ALLOT" 2020-03-07 21:12:30 -05:00
Virgil Dupras 580214426a forth: add +-*/ 2020-03-07 19:42:07 -05:00
Virgil Dupras 30f188b984 forth: add word ":" 2020-03-07 18:54:16 -05:00
Virgil Dupras e7cd3182d0 forth: add words "CREATE", "@", "!", "HERE", "QUIT" 2020-03-07 17:09:45 -05:00
Virgil Dupras 49228e418c apps/forth: new (WIP) application 2020-03-07 12:13:15 -05:00