You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
75 lines
2.6 KiB
75 lines
2.6 KiB
Forth
|
|
=====
|
|
|
|
This is a new implementation of Forth 2012 in C.
|
|
|
|
Building & use
|
|
--------------
|
|
|
|
Use cmake or `build.sh`. It probably needs GCC with `--std=gnu99`.
|
|
|
|
You get a binary with the forth runtime. Run it to get a prompt. Use `-h` for help.
|
|
|
|
Goals
|
|
-----
|
|
|
|
- Comfy to use and extend
|
|
- No dynamic allocation where possible
|
|
- Compact and embeddable so it can be ported to ARM-CortexM or similar later
|
|
- Implement the CORE and CORE-EXT word sets, for a start
|
|
- Pass the [Forth2012 test suite](https://github.com/gerryjackson/forth2012-test-suite), at least for the word sets that are implemented
|
|
- Maybe eventually have some terminal-based implementation of (a subset of) the Facility word set, like AT-XY and keyboard input
|
|
- Try to keep added custom words and quirks at a minimum
|
|
- Comment stuff, maybe
|
|
|
|
Non-Goals
|
|
---------
|
|
|
|
- I don't really care about implementing some of the word sets
|
|
- Performance is not so critical for a hobby Forth like this
|
|
- Probably won't accept merge requests, this is my Forth
|
|
- I also don't care about someone telling me to add a license file
|
|
|
|
Custom words
|
|
------------
|
|
- `.\"` - like `."` but allows escaping, this is essentially `S\" blah" TYPE`, but without allocation (unless compiled)
|
|
- `??` - debug dump of the stacks
|
|
- `reset` - everything should become like if you restarted the program
|
|
- `debug ( flag -- )` - enable or disable verbose logging
|
|
|
|
For debug, there is `see ( "word" -- )` that lets you inspect and disassemble dictionary entries.
|
|
|
|
Implementation status
|
|
---------------------
|
|
|
|
*(this section may be outdated)*
|
|
|
|
Implemented and tested:
|
|
|
|
```
|
|
CORE:
|
|
! ' ( * */ */MOD + +! +LOOP , - . ." # #> #S <# >BODY >NUMBER / /mod 0< 0= 1+ 1- 2! 2* 2/ 2@ 2DROP 2DUP 2OVER 2SWAP
|
|
: ; < = > >IN >R ?DUP @ ABORT ABORT" ABS ALIGN ALIGNED ALLOT AND BASE BEGIN BL C! C, C@ CELL CELL+ CELLS CHAR CHAR+
|
|
CHARS CONSTANT COUNT CR CREATE DECIMAL DEPTH DO DOES> DROP DUP ELSE EMIT ENVIRONMENT? EVALUATE EXECUTE EXIT FILL FM/MOD FIND
|
|
HERE HOLD I IF IMMEDIATE INVERT J LEAVE LITERAL LOOP LSHIFT M* MAX MIN MOD MOVE NEGATE OR OVER POSTPONE QUIT R> R@ RECURSE
|
|
REPEAT ROT RSHIFT S>D S" SIGN SM/REM SOURCE SPACE SPACES STATE SWAP THEN TYPE U. U< UNTIL UM* UM/MOD UNLOOP VARIABLE WHILE WORD XOR [ ['] [CHAR] ]
|
|
|
|
CORE-EXT:
|
|
.( .R :NONAME 0<> 0> 2>R 2R> 2R@ <> ?DO ACTION-OF AGAIN BUFFER: C" CASE COMPILE, DEFER DEFER! DEFER@ ENDCASE ENDOF ERASE FALSE HEX HOLDS IS MARKER NIP OF PAD PARSE PARSE-NAME PICK REFILL RESTORE-INPUT SAVE-INPUT SOURCE-ID ROLL S\" TO TRUE TUCK U.R U> UNUSED VALUE WITHIN
|
|
\
|
|
|
|
Other sets:
|
|
FORGET SEE BYE INCLUDE INCLUDED
|
|
```
|
|
|
|
Missing:
|
|
|
|
```
|
|
CORE:
|
|
ACCEPT KEY
|
|
|
|
CORE-EXT:
|
|
[COMPILE]
|
|
```
|
|
|
|
.
|
|
|