[Sdl-developers] ABNF Grammar

[Daniel Leuck]

Hi Eric,

 

Thank you for the feedback.  Jesse - perhaps your comment above the
definition noting that multi-line comments are not covered is sufficient.

 

Dan

 

  _____  

From: sdl-developers-bounces at ikayzo.org
[mailto:sdl-developers-bounces at ikayzo.org] On Behalf Of E M
Sent: Sunday, January 07, 2007 9:59 PM
To: sdl-developers at ikayzo.org:Information relating to SDL development
Subject: Re: [Sdl-developers] ABNF Grammar

 

Jesse,

I remember that the Lex and Yacc Oreilly book (which I unfortunately gave
away) had an example of lexing multiline comments out of the token stream.
It was done using "start conditions" which basically define a sublexer to
parse the comment out separate from the language definition.

I know that no one is probably using Flex anymore, but if you are writing a
lexer, there might be a hint in the Flex manual. There is a specific example
of parsing C comments with Flex in section 0.11 and 0.18.

Also, I took a look at the official C grammer, and the official Java
grammar, and noticed that both do NOT contain a description of the comment
lexing. So maybe it does not need a description in the language definition
of SDL.

Eric

Jesse Weaver <pianohacker at gmail.com> wrote:

An early version of the grammar
<http://www.ikayzo.org/confluence/display/SDL/ABNF+Grammar>  is up,
supporting everything but multiline comments. Any ideas on how we could add
these?

-- 
Jesse 

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