If you want to write a fast parser for XML, preventing backtracking is going to be quite essential. I suspect the problem is your grammar, not the grammar engine itself. You could post it to perl6-users and ask for advice on it.
Leon On Thu, Jun 4, 2009 at 7:25 AM, Richard Hainsworth <rich...@rusrating.ru> wrote: > Is this a good place to come with code that runs into speed problems? > > I am writing a program in perl6 to read the xml file from a Sony book > reader, list the books, and move books into collections (the Sony software > to do this will only work on windoz and not on wine). > > I have a grammar that works with abbreviated test versions of the xml file, > but it just hangs with the full version. > > Since I have a line > my $parsed= sony_grammar(slurp "media.xml"); > > and the problem is in the parsing, I dont know how to insert trace > statements to determine at what stage the problem is being generated. > > In addition, there is a great deal in the Synopses about code points and > backtracking and the like, which I dont quite understand. However, it seems > to me that an intelligent use of these possibilities could increase the > efficiency of the parsing, if only I knew how. For example, only three of > the tags in the file are of interest, and within them three of the > attributes. So how do I tell the regex engine to skip processing if the tag > is not of interest? > > Richard >
