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collapseos
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17 Commits

Author SHA1 Message Date
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