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Re: Modification to BNF needed for <line_of_text>?

  • Subject: Re: Modification to BNF needed for <line_of_text>?
  • From: James Hester <jrh@xxxxxxxxxxxx>
  • Date: Mon, 1 Jul 2002 05:08:28 +0100 (BST)
Nick writes:

> On Mon, 1 Jul 2002, James Hester wrote:
> 
> > the spec to
> > 
> > <line_of_text> ::= <not_a_semi_colon | terminate> <char>* <terminate>
> > 
> > or adding <terminate> to <not_a_semi_colon>
> 
> Neither of these will work will they(?), because the rules above require
> two consecutive <terminate>s to match. 

Whoops.

> What you want is
> 
> 
> <line_of_text> ::= { <not_a_semi_colon> <char>* | epsilon } <terminate>
> 
> epsilon being the empty string or more long winded,
> 
> <line_of_text> ::= {<not_a_semi_colon> <char>* <terminate> | <terminate>}
> 
> Thoughts?

Yes, I agree, this rule is better.

James.
-- 
_______________________________________________________________________
James Hester, ANBF                             KEK
e-mail: jrh@anbf2.kek.jp                       Oho 1-1
Phone: +81 298 64 7959                         Tsukuba, Ibaraki 305
  Fax: +81 298 64 7967                         Japan
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