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collapseos
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16 Commits

Author SHA1 Message Date
Virgil Dupras d5a7d5faf8 forth: add words "(fbr)", "(fbr?)", "'", "[']" 2020-03-12 21:16:20 -04:00
Virgil Dupras ff281f69a8 forth: add "UNWORD" flag 
Also, reorder word fields so that the flag field is more easily accessible.
 2020-03-12 11:39:27 -04:00
Virgil Dupras ea5f33558a forth: make branching offsets 1 byte 
Those bytes, those precious bytes!
 2020-03-11 19:52:49 -04:00
Virgil Dupras 3996f0c825 forth: fix IF/THEN/ELSE in colon defs 2020-03-11 17:53:27 -04:00
Virgil Dupras 6757c097ea forth: change the whole execution model again 
Things are better now, but immediates inside colons are broken. However,
IF/THEN/ELSE are now immediates and it's much cleaner this way. Still, this
commit has too much stuff in it, I need to commit, I don't want to lose this
step.
 2020-03-10 21:37:06 -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 0b3f6253e4 forth: add support for IMMEDIATE words 2020-03-09 22:13:11 -04:00
Virgil Dupras 03bd9ee39b forth: make readCompWord read from RS' BOS instead of TOS 
Previous approach was broken with regards to defined word using CREATE.

Also, reduce name length by one to make space for a new flags field for
"immediate" (which isn't used yet).
 2020-03-09 19:50:51 -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 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 f0cf10ab7c forth: Check for PS underflow 2020-03-07 20:20:11 -05:00
Virgil Dupras ad2aca4620 forth: add number literals support 2020-03-07 19:25:55 -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 391ddb9984 forth: add word "." 2020-03-07 12:50:54 -05:00
Virgil Dupras 49228e418c apps/forth: new (WIP) application 2020-03-07 12:13:15 -05:00