Re: why use flex?

Marko =?ISO-8859-1?Q?M=E4kel=E4?= <Marko.Makela@HUT.FI>
3 Feb 1999 23:56:19 -0500

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Re: why use flex? Marko.Makela@HUT.FI (Marko =?ISO-8859-1?Q?M=E4kel=E4?=) (1999-02-03)
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From: Marko =?ISO-8859-1?Q?M=E4kel=E4?= <Marko.Makela@HUT.FI>
Newsgroups: comp.compilers
Date: 3 Feb 1999 23:56:19 -0500
Organization: Helsinki University of Technology, CS lab
References: 99-01-111 99-02-004
Keywords: lex, C++

>>>>> "Travers" == Travers Naran <tnaran@direct.ca> writes:


Travers> The only real complaint I have is the *still* lacking direct
Travers> C++ support. If one wants that, one has to use to modified
Travers> Flex++/Bison++ utilities.


Pardon me, but what kind of C++ support would you like to expect from
Flex and Bison? I have used Flex 2.5.4 and Bison 1.25 in two compiler
projects, both of which are written in C++. I use the tools in the
traditional C mode; only the semantic actions contain C++ code.


Could someone enlighten me what kind of real advantages using
generated scanner and parser classes could have over the traditional
yyparse () / yylex () interface? Does it have something to do with
re-entrant parsers? Or does it make "sub-parser calls" easier
(i.e. when the input can contain multiple languages that cannot be
feasibly handled by one parser, like SDL (ITU-T Z.100,Z.105) with
ASN.1 definitions embedded between the ALTERNATIVE/ENDALTERNATIVE
keywords)?


Marko

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