ascii_tree | Parses a usable tree from ASCII art | Parser library

I have a Flexlm/Flexnet licenses service and I want parse the outputs of this service. All output are structured block of multi-lines. My first step is to parse the output of lmutil lmstat -c -a to have the usage of licences and increments.

I try to use Ruby and Parslet. All lines are individually well parsed. I have a rule to parse a repetition of a specific type of line, but I can't parse a structured block of lines.

I'm looking for the law (best word in this context than 'rule') that define where to put the 'newline' statement in a multi-line structured block.

I working with Debian Jessie (stable/x86_64) and Ruby 2.1.5p273 and Parslet 1.6.1-1.

I've contacted the author, he is sorry but he haven't enough time to help me. The webpages seen are :

• URL: www.viget.com/articles/write-you-a-parser-for-fun-and-win
• URL: jmettraux.wordpress.com/2011/05/11/parslet-and-json/
• Recursive Descent Parsers (Calle) - Video
• Wicked Good Ruby 2013 - Writing DSL's with Parslet by Jason Garber - Video
• Proper Ruby style for multi-line method chaining containing blocks - StackOverFlow
• Ruby parslet: parsing multiple lines - StackOverFlow
• How do I handle C-style comments in Ruby using Parslet? - StackOverFlow

I passed many hours to try to understand how to construct the rules of a multi-line structured block. Below you have my source code with all test strings and the output.

My approach is to build:

1. the elementary rule to parse a fragment of line
2. the rule to parse a complete line without the 'newline' statement;
3. a rule to parse the repetition of an information of the same type, like the line for the used tokens;
4. the rule to parse a group of data : header + repetition of lines;
5. the rule to parse a repetition of groups.

I'm not sure of the point 3, and I'm completely lost with '4' and '5'.

Thanks in advance for any help. [ 07/14/2017 : some parts of code was removed ]