[antlr-interest] Pie and simple expression calculator

[Kyle Ferrio]

Apologies... I did not know that the C-- example did not work wirh 3.4.  I
learned a lot from C-- ages ago so it sticks in my mind more than it
should, apparently.  I'm glad to see you found a workable example.

Kyle
On Jan 3, 2012 2:05 AM, "goodwin" <goodwin at essence-property.com> wrote:

> Apologies if this is getting a bit long, but it may be of interest to
> others
> going down a similar road.
>
>
> The C-- example in the file share area does not work with 3.4, it has
> uncompileable
>
>
> void =null
>
>
> statements, and on searching the archives it seems that the approach is not
> recommended anyway.
>
>
> So that probably leaves me with Pie as the best starting point, at least we
> know it should work with 3.4 and uses a recommended approach.
>
>
> But it will still need a bit of work - extend to a full expression handler,
> and deal with unary operations like sin/cos/exp/log.
>
>
> I looked at some other examples, but they didn't seem a good starting
> point,
> but maybe I can take something from them. I need to study
>
>
> http://www.antlr.org/wiki/display/ANTLR3/Simple+tree-based+interpeter
>
>
> a bit more.
>
>
> -----Original Message-----
>  From: "goodwin" <goodwin at essence-property.com>
>  To: antlr-interest at antlr.org
>  Date: Tue, 03 Jan 2012 00:13:12 +0000
>  Subject: Re: [antlr-interest] Pie and simple expression calculator
>
>
> 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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