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1 point by Adlai 5645 days ago | link | parent

It looks good! Thank you also for using my idea.

Side note: compare the "profiles" of this version, and the earlier versions -- this one has a much more "functional" profile.

I'm a bit confused what you mean about atend:err. Do you basically mean that there would be function composition between a macro, and a call to, for example, (err "missing char after backslash")? Something like

  (mac atend (alert)
    `(unless (peekc (stdin))
       ,alert))
I think I'm missing something...

EDIT: I get it now. I hadn't noticed that you only use /atend[-:]err/ at points where the next character might "correct" the error.



1 point by CatDancer 5645 days ago | link

Do you basically mean that there would be function composition between a macro, and a call

Yes, a composition, though not a function composition. Because the Arc compiler rewrites (a:b ...) as (a (b ...)) when a:b appears in the first position in an expression, it works for macros also.

Thus

  (atend:err "missing close quote")
expands into

  (atend (err "missing close quote"))
which macro expands into

  (unless (peekc (stdin))
    (err "missing close quote"))

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