13 Commits

Author	SHA1	Message	Date
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	f0cf10ab7c	forth: Check for PS underflow	2020-03-07 20:20:11 -05:00
Virgil Dupras	580214426a	forth: add +-*/	2020-03-07 19:42:07 -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	6f9d28b325	forth: add word "bye" ... And make interpret action looping until BYE.	2020-03-07 13:15:19 -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