• Saved to GitHub in 2018.

• Tutorial at CPAN Parse::Eyapp::debuggingtut

• Be sure you have Perl installed:

   usuario@ubuntu:~$ perl -v
  
   This is perl 5, version 26, subversion 1 (v5.26.1) built for x86_64-linux-gnu-thread-multi
   (with 67 registered patches, see perl -V for more detail)
  

• Install last version using cpan Parse::Eyapp

• I have used version 1.182 for this examples. I believe they will work with current versions of Eyapp:

  $ eyapp -V
  This is Parse::Eyapp version 1.182.
  

• Available options:

  $ eyapp -h
  Usage:  eyapp [options] grammar[.eyp]
    or    eyapp -V
    or    eyapp -h
  
      -m module   Give your parser module the name <module>
                  default is <grammar>
      -v          Create a file <grammar>.output describing your parser
                  The LALR tables aren't compacted
      -vN         Create a file <grammar>.output describing your parser
                  LALR tables are compacted.
      -w          Create a file <grammar>.dot graph describing your parser.
                  You can then generate a .png file using dot:
                              dot -Tpng  grammar.dot -o grammar.png
      -W          Create a file <grammar>.dot graph describing your parser
                  Nodes are labelled with core LR-items
      -s          Create a standalone module in which the driver is included
      -S symbol   Use 'symbol' as start symbol of the grammar
      -n          Disable source file line numbering embedded in your parser
      -o outfile  Create the file <outfile> for your parser module
                  Default is <grammar>.pm or, if -m A::Module::Name is
                  specified, Name.pm
      -t filename Uses the file <filename> as a template for creating the parser
                  module file.  Default is to use internal template defined
                  in Parse::Eyapp::Output
      -b shebang  Adds '#!<shebang>' as the very first line of the output file
      -B prompt   Adds a modulino call '__PACKAGE->main(<prompt>) unless caller();' 
                  as the very last line of the output file
      -C          An abbreviation for the combined use of -b ''  -B ''
      -T          Equivalent to %tree
      -N          Equivalent to %nocompact. Do not compact action tables. 
      -l          Do not generate the lexical analyzer. One must be explictly provided
      -P          Accept if prefix conforms to the language, even if is not legal up 
                  to the end 
      -c grammar  Displays the "clean" grammar without actions     
      -vc grammar Displays the "clean" grammar without actions. Strip comments also
      -V          Display current version of Parse::Eyapp and gracefully exits
      -h          Display this help screen
  
      grammar     The grammar file. If no suffix is given, and the file
                  does not exists, .eyp is added