some treetop debug tips

Treetop seems pretty nice, but information on it’s usage is kind of scattered all over internet :). Here are a few tips that I used to debug grammars:

  1. You can try a specific rule by writing this:

    tree = parser.parse(content,:root => "rule_name")
  2. I usually have my code structured like this, to get some info about where the parser chokes:
    if tree
        puts "succesful"
        puts "unsuccesful at #{parser.index}"
        puts parser.failure_reason

Hope this helps you as much as it helped me.


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