[antlr-interest] rules for ASCII

[Ric Klaren]

On Sun, Jun 22, 2003 at 09:54:19PM +0200, berserksangr wrote:
> In my parser created for c++, I need to parse a file that contains
> some national signs. They have ASCII codes, i.e. 161, 198, 202, 163. How can
> I write a lexer rule for accepting only chains made of this signs?
>
> NATIONAL_CHAIN: (SIGN_161|SIGN_198|SIGN_202|SIGN_163)+;
> 
> My question can be treat more generally: What are the relations
> between ASCII code and its ANTLR grammar representation in C++
> ANTLR-related code?

Directly one on one. so 161 -> '\241', 198 -> '\306', 202 -> '\312' and 163
-> '\243'.

NATIONAL_CHAIN: ('\241'|'\306'|'\312'|'\243')+;

Cheers,

Ric

PS those are technically not ASCII but extended ASCII (or what it's called)
--
-----+++++*****************************************************+++++++++-------
    ---- Ric Klaren ----- j.klaren at utwente.nl ----- +31 53 4893722  ----
-----+++++*****************************************************+++++++++-------
  Wo das Chaos auf die Ordnung trifft, gewinnt meist das Chaos, weil es
  besser organisiert ist. --- Friedrich Nietzsche


 

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