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