[rkward-devel] JS in rkwarddev

[meik michalke]

hi,

Am Dienstag, 27. Oktober 2015, 08:29:43 schrieb Thomas Friedrichsmeier:
> Very cool, indeed. Congrats! This addresses a whole lot of my
> concerns.

to be honest, i don't like using ifelse() either... i always wanted to be able 
to use plain "if" conditions in the first place, but back then i had no clue 
how to prevent R from evaluating such basic control elements. you successfully 
pushed me to go dig deeper ;-)

> Pressing you some further, though: Will you be able to cover
> for()-loops, too?

i guess so.

basically, what i'm doing is to call eval(substitute(alist(...))) on a dots 
argument of a function call, which will yield to a list of unevaluated R code.
try this:

 dummy <- function(...){
   return(eval(substitute(alist(...))))
 }

 dummyCalls <- dummy(
   for (i in 1:10) {
     paste(i)
   }
 )

 as.list(dummyCalls[[1]])

it's pretty straight forward from then on -- see if dummyCalls[[1]] equals 
"for", then dummyCalls[[2]] is the variable name, dummyCalls[[3]] the values 
to go through and dummyCalls[[4]] the loop body. i hope ;-)

> (And will you still give me idq() so I know I can mix
> your high-level magic with "bare-to-the-bone" JS?)

i think except for the quotes you don't have to wait for it. you proposed:

 rk.paste.JS ('var x = getString (', idq (x), ');'

something similar is possible with id():

 rk.paste.JS (id("var x = getString ('", x, "');"))

the thing is that by courtesy rk.paste.JS() automatically adds a new line 
after each comma, hence adding idq() would only solve (less than) half of the 
problem. but you should be fine if you wrap everything inside 
rk.paste.JS(id()) and take care of the quotes yourself.


viele grüße :: m.eik

PS: global variables are also implemented, see the "globals" argument of 
?rk.JS.doc, which is also available in the "js" list argument of 
?rk.plugin.component and ?rk.plugin.skeleton
-- 
  dipl. psych. meik michalke
  institut f"ur experimentelle psychologie
  abt. f"ur diagnostik und differentielle psychologie
  heinrich-heine-universit"at d-40204 d"usseldorf
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