[antlr-interest] Pie and simple expression calculator

[Kyle Ferrio]

Hi again.

When you compare how math expressions are implented in the antlr3 grammar
for C-- and in the antlr4 grammar for R, you will get a pretty good sense
of how the addition of left recursion to LL(*) is going to make our jobs
easier.

Offtopic...I like R for quick analyses, but I prefer not to push it too
far.  I've collected enough quirky languages for a lifetime.  And your
description of your experience suggests that we have traveled parallel
rings in this inferno.  Lions, tigers and "parsers" written in FORTRAN
77.   Oh my!

Careful...if your language "just works" you may be cutting yourself off
from a lucrative support business!  :)

Kyle
 On Jan 2, 2012 5:13 PM, "goodwin" <goodwin at essence-property.com> wrote:

> Thanks. I will probably start with the C-- example as a base, and compare
> it
> with the other examples.
>
>
> I have been a heavy user of R in the past, so will keep a close eye on
> antlr4
> and R. R is nice and simple as a language, at least initially, until you
> start using the full power.
>
>
> My interest in formal languages dates from the mid 80's or earlier (I was
> involved in late 70's with a Fortran program which took hundreds of
> thousands of lines to interpret a complex command language), but never
> actually got my hands dirty, so it has always been on my bucket list, and
> now I have good commercial reasons for doing so, not having any staff
> currently to delegate to!
>
>
> My starting point is what is simple and easy to use for my end users, they
> are people who are happy enough to program Excel macros, but not much more
> than that.
>
>
> Plus people nowadays expect the full language editors, pop up lists, good
> error diagnostics, suggestions, a fully interactive editor for the defined
> language, so they can comfortably write their own scripts. Anything which
> reduces support calls from the users.
>
>
> -----Original Message-----
>  From: Kyle Ferrio <kferrio at gmail.com>
>  To: goodwin at essence-property.com
>  Cc: antlr-interest at antlr.org
>  Date: Mon, 2 Jan 2012 15:27:30 -0700
>  Subject: Re: [antlr-interest] Pie and simple expression calculator
>
>
> C-- is a very informative example.  Also check out Scott Stanchfield's
> videos
> on vimeo.com.
>
> Scott uses the antlr3 plugin for eclipse.  If you're not an eclipse user
> already, and you're in a hurry, you can still learn a lot just by watching
> his videos.
>
> Kyle
>
> On Jan 2, 2012 2:03 PM, "goodwin" <goodwin at essence-property.com> wrote:
>
> Maybe my best starting point is the C-- example in the shared area.
>
>
>  Maybe I need to sit down and compare all these examples line by line.
>
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