[gforth] / gforth / chains.fs

gforth: gforth/chains.fs

1 :	jwilke	1.1	\ chains.fs execution chains for gforth 21jun97jaw
2 :
3 :			0 [IF]
4 :			This defines execution chains.
5 :			The first application for this is building initialization chains:
6 :			Think of many modules or program parts, each of it with some specific
7 :			initialization code. If we hardcode the initialization routines into a
8 :			"master-init" we will get unflexible and are not able only to load some
9 :			specific modules...
10 :
11 :			The chain is basicaly a linked-list. Define a Variable for the head of
12 :			linked-list. Name it "foo8" or "foo-chain" to indicate it is a execution
13 :			chain.
14 :
15 :			You can add a word to the list with "' my-init foo8 chained". You can
16 :			execute all the code with "foo8 chainperform".
17 :			[THEN]
18 :
19 :			[IFUNDEF] linked
20 :			: linked here over @ a, swap ! ;
21 :			[THEN]
22 :
23 :			\ generic chains
24 :
25 :			: chained ( xt list -- ) \ gforth
26 :			linked , ;
27 :
28 :			: chainperform ( list -- ) \ gforth
29 :			BEGIN @ dup WHILE dup cell+ perform REPEAT drop ;
30 :