RE: [Boost-users] Re: Tweaking the Skip Parser, was RE: Spirit 1.6 with VC6
Okay. Problem solved. The answer was indeed inside #scanner_business. Rules make for picky parsers. So I used a grammar<> and it compiled just fine. Now if I can just get it to WORK. ;) Whoops. Infinite recursion. Back to the drawing board... but at least now I don't need "*comment" sprinkled liberally throughout my rules. --Mark Storer Senior Software Engineer Verity, Inc.
-----Original Message----- From: boost-users-bounces@lists.boost.org [mailto:boost-users-bounces@lists.boost.org]On Behalf Of Jeff Flinn Sent: Friday, June 25, 2004 10:46 AM To: boost-users@lists.boost.org Subject: [Boost-users] Re: Tweaking the Skip Parser,was RE: Spirit 1.6 with VC6
Take a look at:
http://www.boost.org/libs/spirit/doc/faq.html#scanner_business
You don't want the skip parser to be a phrase level scanner.
parse(str, rules, space_p | comment_p( "/*", "*/" ) | comment_p( "//" ) )
may work for you?
Jeff F
No chance of switching to 7.1? :-)
Things are looking up. We just did a project-wide upgrade to... VC7.1. Problem solved. I'm now merrily writing rules for my JavaScript parser. It doesn't have to support the whole language (not for a while, maybe never), I just need to be able to parse out the names and locations of all the functions in a file. It's for a JavaScript editor built into one of our
"Mark Storer" <MStorer@verity.com> wrote in message news:076D1E704127414E9FEAFFC31F66C9472739CD@vrsdex1.verity.com... products, and later we'll be adding auto-completion. That'll require a more thorough parser, but for now, I'm just after funciton locations.
So far so good... though I'll undoubtedly be quite familiar with the
BOOST_SPIRIT_DEBUG* macros before I'm done.
I've got another Spirit question: I've been adding
"*comment" throughout the rules and it's getting tiresome:
rule<phrase_scanner_t> blockComment = comment_p( "/*", "*/" ); rule<phrase_scanner_t> lineComment = comment_p( "//" ); rule<phrase_scanner_t> comment = blockComment | lineComment;
Spraying the "comment" rule liberally through my rules is
an option...
rule<phrase_scanner_t> codeBlock = ch_p('{') >>
*(comment | codeBlock | ~ch_p('}')) >> ch_p('}');
... but not an appealing one. This becomes particularly
true once I start working on the auto-completion parser.
It just occured to me that if the skip parser ate
comments for me, it would greatly simplify my rules. I'd like to tweak the skip parser so it skips over my "comment" rule as well as white space. I just took a stab at this, but didn't get very far. I tried:
parse(str, rules, space_p | comment)
but that resulted in a compiler error. 7.1's errors are
MUCH easier to read that 6's. I'm going to like this new compiler.
C:\SDKs\boost_1_31_0\boost\spirit\core\non_terminal\impl\rule. ipp(190): error C2664: 'boost::spirit::impl::abstract_parser<ScannerT,AttrT>::do_pars e_virtual' : cannot convert parameter 1 from 'const scanner_t' to 'const boost::spirit::rule<T0>::scanner_t &'
with [
ScannerT=boost::spirit::rule<boost::spirit::phrase_scanner_t>: :scanner_t,
AttrT=boost::spirit::rule<boost::spirit::phrase_scanner_t>::attr_t
] and [ T0=boost::spirit::phrase_scanner_t ]
Pointing me to the relevant section of the docs is an
acceptable answer, though I wouldn't mind a little more info than that. ;)
I'll keep plugging away. If I come up with an answer, I'll
post it to the list. I'd expect this to be useful to other beginners at the very least.
--Mark Storer Senior Software Engineer Verity, Inc.
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Mark Storer