Re: Ignore break line sometimes

On Sat, 11 Feb 2012 06:56:17 -0800 (PST), Geovani de Souza
<geovanisouza92@gmail.com> wrote:


>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'.
>
>Too ignore '\n' in the white lines.
>
>How can I do this?


IMO making the newlines significant is a really bad idea ... but
leaving that aside I believe the most effective way would be to have
your lexer return a special "end-of-line" code for either semicolon or
newline and make the end-of-line code optional where it need not be.


You don't say whether your parser is handwritten or tool generated (or
which tools) ... so I can't really give an example.


George

Return to the comp.compilers page.
Search the comp.compilers archives again.