Re: Ignore break line sometimes

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From	Hans-Peter Diettrich <DrDiettrich1@aol.com>
Newsgroups	comp.compilers
Subject	Re: Ignore break line sometimes
Date	Sat, 11 Feb 2012 17:28:36 +0100
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Geovani de Souza schrieb:
> 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'.

That's why many (compiled) languages ignore line ends and other
whitespace, and require explicit statement termination, e.g. by a
semicolon. Interpreters instead often prefer the "one statement per
line" approach, with the option to concatenate statements by e.g. a colon.

IMO you should make a decision about the meaning of whitespace in
general, and of line endings in detail, in your language.

Please give an example that would compile differently when linefeeds are
  removed, and then answer yourself the question whether this really
will make sense.

DoDi

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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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