OK ... I have a long answer for you ... check out https://gist.github.com/NigelThorne/96c6a833f4e856a5f500
It's too long for this mailing group. In short you have something matching: "keyword_end.absent? > root" which is like "keyword_end.absent? > (a|b|c|d|).repeat(0)" absent? and repeat(0) both have a "consume nothing" options.. so can match forever. --- "No man is an island... except Philip" On Tue, Jun 3, 2014 at 4:59 PM, Torsten Ruger <[email protected]> wrote: > So, > > I am adding features to my parser at an amazing rate, 250+ tests > already. It's so easy that i catch myself thinking i am cheating. > The other day i added qualified function calls in like 10 minutes or so. > _Great_ > > But now i have hit this "hanging" issue and am not sure how to even > debug. Generally speaking, sometimes when i make a small typing mistake, > instead of getting an error from parslet i get silence. No matter how > long i let it run, when i interrupt, it's always about the same > stack-trace (below): > > I put a test case for this up : > > https://github.com/ruby-in-ruby/crystal/blob/master/test/parser/test_fails.rb > If you look, it defines a function in a class, and generally speaking > that works. > But the case has no brackets on the function, as is legal in ruby. But I > haven't implemented that, so in my parser it's not legal. > Iif i add () after the function it works. > > The function is defined here: > https://github.com/ruby-in-ruby/crystal/blob/master/lib/parser/call_site.rb > but i that alone can't be the problem, because outside a class > definition i do get the error, not the hang. > > So, as i said, any clues to how i can debug that kind of thing ? > > Torsten > > > > > /Users/raisa/.rbenv/versions/2.0.0-p353/lib/ruby/gems/2.0.0/gems/parslet-1.6.1/lib/parslet/source.rb:84:in > `bytepos=': Interrupt > from > > /Users/raisa/.rbenv/versions/2.0.0-p353/lib/ruby/gems/2.0.0/gems/parslet-1.6.1/lib/parslet/atoms/context.rb:46:in > `try_with_cache' > from > > /Users/raisa/.rbenv/versions/2.0.0-p353/lib/ruby/gems/2.0.0/gems/parslet-1.6.1/lib/parslet/atoms/base.rb:83:in > `apply' > from > > /Users/raisa/.rbenv/versions/2.0.0-p353/lib/ruby/gems/2.0.0/gems/parslet-1.6.1/lib/parslet/atoms/repetition.rb:35:in > `block in try' > from > > /Users/raisa/.rbenv/versions/2.0.0-p353/lib/ruby/gems/2.0.0/gems/parslet-1.6.1/lib/parslet/atoms/repetition.rb:34:in > `loop' > from > > /Users/raisa/.rbenv/versions/2.0.0-p353/lib/ruby/gems/2.0.0/gems/parslet-1.6.1/lib/parslet/atoms/repetition.rb:34:in > `try' > from > > /Users/raisa/.rbenv/versions/2.0.0-p353/lib/ruby/gems/2.0.0/gems/parslet-1.6.1/lib/parslet/atoms/context.rb:31:in > `try_with_cache' > from > > /Users/raisa/.rbenv/versions/2.0.0-p353/lib/ruby/gems/2.0.0/gems/parslet-1.6.1/lib/parslet/atoms/base.rb:83:in > `apply' > from > > /Users/raisa/.rbenv/versions/2.0.0-p353/lib/ruby/gems/2.0.0/gems/parslet-1.6.1/lib/parslet/atoms/named.rb:17:in > `apply' > from > > /Users/raisa/.rbenv/versions/2.0.0-p353/lib/ruby/gems/2.0.0/gems/parslet-1.6.1/lib/parslet/atoms/sequence.rb:29:in > `block in try' > from > > /Users/raisa/.rbenv/versions/2.0.0-p353/lib/ruby/gems/2.0.0/gems/parslet-1.6.1/lib/parslet/atoms/sequence.rb:27:in > `each' > from > > /Users/raisa/.rbenv/versions/2.0.0-p353/lib/ruby/gems/2.0.0/gems/parslet-1.6.1/lib/parslet/atoms/sequence.rb:27:in > `each_with_index' > from > > /Users/raisa/.rbenv/versions/2.0.0-p353/lib/ruby/gems/2.0.0/gems/parslet-1.6.1/lib/parslet/atoms/sequence.rb:27:in > `try' > from > > /Users/raisa/.rbenv/versions/2.0.0-p353/lib/ruby/gems/2.0.0/gems/parslet-1.6.1/lib/parslet/atoms/context.rb:31:in > `try_with_cache' > from > > /Users/raisa/.rbenv/versions/2.0.0-p353/lib/ruby/gems/2.0.0/gems/parslet-1.6.1/lib/parslet/atoms/base.rb:83:in > `apply' > from > > /Users/raisa/.rbenv/versions/2.0.0-p353/lib/ruby/gems/2.0.0/gems/parslet-1.6.1/lib/parslet/atoms/entity.rb:21:in > `try' > from > > /Users/raisa/.rbenv/versions/2.0.0-p353/lib/ruby/gems/2.0.0/gems/parslet-1.6.1/lib/parslet/atoms/context.rb:31:in > `try_with_cache' > from > > /Users/raisa/.rbenv/versions/2.0.0-p353/lib/ruby/gems/2.0.0/gems/parslet-1.6.1/lib/parslet/atoms/base.rb:83:in > `apply' > from > > /Users/raisa/.rbenv/versions/2.0.0-p353/lib/ruby/gems/2.0.0/gems/parslet-1.6.1/lib/parslet/atoms/alternative.rb:35:in > `block in try' > from > > /Users/raisa/.rbenv/versions/2.0.0-p353/lib/ruby/gems/2.0.0/gems/parslet-1.6.1/lib/parslet/atoms/alternative.rb:34:in > `map' > from > > /Users/raisa/.rbenv/versions/2.0.0-p353/lib/ruby/gems/2.0.0/gems/parslet-1.6.1/lib/parslet/atoms/alternative.rb:34:in > `try' > from > > /Users/raisa/.rbenv/versions/2.0.0-p353/lib/ruby/gems/2.0.0/gems/parslet-1.6.1/lib/parslet/atoms/context.rb:31:in > `try_with_cache' > from > > /Users/raisa/.rbenv/versions/2.0.0-p353/lib/ruby/gems/2.0.0/gems/parslet-1.6.1/lib/parslet/atoms/base.rb:83:in > `apply' > from > > /Users/raisa/.rbenv/versions/2.0.0-p353/lib/ruby/gems/2.0.0/gems/parslet-1.6.1/lib/parslet/atoms/repetition.rb:35:in > `block in try' > from > > /Users/raisa/.rbenv/versions/2.0.0-p353/lib/ruby/gems/2.0.0/gems/parslet-1.6.1/lib/parslet/atoms/repetition.rb:34:in > `loop' > from > > /Users/raisa/.rbenv/versions/2.0.0-p353/lib/ruby/gems/2.0.0/gems/parslet-1.6.1/lib/parslet/atoms/repetition.rb:34:in > `try' > from > > /Users/raisa/.rbenv/versions/2.0.0-p353/lib/ruby/gems/2.0.0/gems/parslet-1.6.1/lib/parslet/atoms/context.rb:31:in > `try_with_cache' > from > > /Users/raisa/.rbenv/versions/2.0.0-p353/lib/ruby/gems/2.0.0/gems/parslet-1.6.1/lib/parslet/atoms/base.rb:83:in > `apply' > from > > /Users/raisa/.rbenv/versions/2.0.0-p353/lib/ruby/gems/2.0.0/gems/parslet-1.6.1/lib/parslet/atoms/entity.rb:21:in > `try' > from > > /Users/raisa/.rbenv/versions/2.0.0-p353/lib/ruby/gems/2.0.0/gems/parslet-1.6.1/lib/parslet/atoms/context.rb:31:in > `try_with_cache' > from > > /Users/raisa/.rbenv/versions/2.0.0-p353/lib/ruby/gems/2.0.0/gems/parslet-1.6.1/lib/parslet/atoms/base.rb:83:in > `apply' > from > > /Users/raisa/.rbenv/versions/2.0.0-p353/lib/ruby/gems/2.0.0/gems/parslet-1.6.1/lib/parslet/atoms/base.rb:70:in > `setup_and_apply' > from > > /Users/raisa/.rbenv/versions/2.0.0-p353/lib/ruby/gems/2.0.0/gems/parslet-1.6.1/lib/parslet/atoms/base.rb:30:in > `parse' > >
