(flex.info.gz) ERASEME56

 
 ERASEME56
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      To: Mikael.Latvala@lmf.ericsson.se
      Subject: Re: Possible mistake in Flex v2.5 document
      In-reply-to: Your message of Fri, 05 Sep 1997 16:07:24 PDT.
      Date: Fri, 05 Sep 1997 10:01:54 PDT
      From: Vern Paxson <vern>
 
      > In that example you show how to count comment lines when using
      > C style /* ... */ comments. My question is, shouldn't you take into
      > account a scenario where end of a comment marker occurs inside
      > character or string literals?
 
      The scanner certainly needs to also scan character and string literals.
      However it does that (there's an example in the man page for strings), the
      lexer will recognize the beginning of the literal before it runs across the
      embedded "/*".  Consequently, it will finish scanning the literal before it
      even considers the possibility of matching "/*".
 
      Example:
 
      	'([^']*|{ESCAPE_SEQUENCE})'
 
      will match all the text between the ''s (inclusive).  So the lexer
      considers this as a token beginning at the first ', and doesn't even
      attempt to match other tokens inside it.
 
      I thinnk this subtlety is not worth putting in the manual, as I suspect
      it would confuse more people than it would enlighten.
 
      		Vern

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