Re: Ignore break line sometimes

From	Joshua Cranmer <Pidgeot18@verizon.invalid>
Newsgroups	comp.compilers
Subject	Re: Ignore break line sometimes
Date	2012-02-12 12:03 -0600
Organization	Compilers Central
Message-ID	<12-02-017@comp.compilers> (permalink)
References	<12-02-010@comp.compilers>

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On 2/11/2012 8:56 AM, Geovani de Souza wrote:
> Hi all!
>
> I'm trying write an parser to my compiler, and I'm interessed to
> ignore the break line (\n) sometimes. E.g:
>
> if true then [\n] foo(); [\n] end; [\n]
>
> So, in the first line, the '\n' after 'then' isn't important, but in
> the second "foo();" could replace the need of the semicolon to
> conclude the statement, or still, in the 'end'.

It sounds like you want something like ECMAScript's magic
you-don't-always-need-a-semicolon feature.
<http://bclary.com/2004/11/07/#a-7.9> describes how it works in detail.
The thrust of it is that "if you see an invalid token, but you saw a
newline before, automatically insert a semicolon to fix things."

There are more than a few people who believe that this feature should
not have been implemented.

--
Beware of bugs in the above code; I have only proved it correct, not
tried it. -- Donald E. Knuth

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Thread

Ignore break line sometimes Geovani de Souza <geovanisouza92@gmail.com> - 2012-02-11 06:56 -0800
  Re: Ignore break line sometimes Hans-Peter Diettrich <DrDiettrich1@aol.com> - 2012-02-11 17:28 +0100
  Re: Ignore break line sometimes George Neuner <gneuner2@comcast.net> - 2012-02-11 12:59 -0500
  RE: Ignore break line sometimes "Karsten Nyblad" <uu3kw29sb7@snkmail.com> - 2012-02-12 09:21 +0100
    Re: Ignore break line sometimes Kaz Kylheku <kaz@kylheku.com> - 2012-02-13 00:16 +0000
  Re: Ignore break line sometimes Stefan Monnier <monnier@iro.umontreal.ca> - 2012-02-12 10:48 -0500
  Re: Ignore break line sometimes Joshua Cranmer <Pidgeot18@verizon.invalid> - 2012-02-12 12:03 -0600
    Re: Ignore break line sometimes Gene Wirchenko <genew@ocis.net> - 2012-02-19 20:57 -0800
      Re: Ignore break line sometimes glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2012-02-20 08:09 +0000
        Re: Ignore break line sometimes arnold@skeeve.com (Aharon Robbins) - 2012-02-23 21:51 +0000
          Re: Ignore break line sometimes "Jonathan Thornburg" <jthorn@astro.indiana.edu> - 2012-02-27 03:49 +0000
  Re: Ignore break line sometimes "BartC" <bc@freeuk.com> - 2012-02-14 00:25 +0000

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