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[REBOL] Re: Dialects - Bane or Blessing? (was: Teaching Rebol)

From: greggirwin:mindspring at: 27-Sep-2002 9:46

I have a few I've done as well, and let's not forget about make-doc and it's relatives! Here are some examples of a few of mine. ===REBOLogo, which is just a very basic version of Logo: box-tri-procs [ to box pen-down set-pen-color any repeat 4 [fd 100 rt 90] end to triangle pen-down set-pen-color any repeat 3 [fd 100 rt 120] end box triangle to tri-box box triangle end repeat 3 [ left 90 tri-box ] pen-up fd 200 set-heading 180 tri-box ] ===FSM (and the FSM for a turnstile): when locked coin causes unlock then unlocked pass causes alarm when unlocked coin causes thank-you pass causes lock then locked The FSM engine does all the action triggering and state changing for you given a spec like this. All you have to do is feed it events. ===RMake. Similar to MAKE, with an engine that processes the rules and performs the actions based on dependency evaluation: spec-1: [ target %xxx.bld depends on [%xxx-0.txt %xxx-1.txt] made by [ print ["rebuilding" _target "from" _source] write _target rejoin [now/time/precise newline read _source] ] target %xxx-1.txt depends on %xxx-2.txt made by [ print ["rebuilding" _target "from" _source] write _target rejoin [_target tab now/time/precise newline read _source] ] target %xxx-2.txt depends on %xxx-3.txt made by [ print ["rebuilding" _target "from" _source] write _target rejoin [_target tab now/time/precise newline read _source] ] ] rmake/build spec-1 ===RAWK (REBOL AWK): test-prog: [ begin [print "begin"] end [print "end"] begin-file [print ["begin-file" _filename]] end-file [print ["end-file" _filename]] every-line [line-ct: line-ct + 1] (find rawk/_ "[") [print ["found line with bracket:" rawk/_fnr rawk/_]] [_/1 = "lng"] [print ["found line with _/1 = Lng:" _fnr _]] [(field 1) = "lng"] [print ["found line with _/1 = Lng:" _fnr _]] [(length? __) = 21][print "found line exactly 21 chars long"] [_nr = 1] [print "record 1"] [_fnr = 1] [print ["file record 1" _filename]] [all [(_nr >= first-line)(_nr <= 12)]] [print ["record from 10 to 12" tab _nr]] [_nr // 1000 = 0] [prin "."] ] ===Send-keys (for sending keystrokes to other applications): win-send-keys compose [ "Gregg" return tab F5 alt #"f" #"o" wait 0:0:0.1 alt "n" wait .5 escape {^/This is some more text (with a "quote")... no less. } divide return shift ["i" shift-up "rwin"] return shift "i" "rwin" return "Irwin" return "0" 10 return (s: copy "" repeat i 10 [append s form i]) return (do func [/local s] [s: copy "" repeat i 10 [append s to char! add i 64] s]) return ctrl "s" wait .5 escape return ] Something to note about these dialects is that some allow you to embed REBOL code directly in them. REBOLogo is just Logo, and Send-keys is just what it is, but you can still use COMPOSE to create dynamic content with REBOL of course. FSM, RMAKE, and RAWK all perform actions, which is to say that they execute REBOL statements - so there is a definite and direct link to REBOL. I have some others that I've just sketched out a bit. Some of them use REBOL directly but others are "pure" dialects. --Gregg