view release on metacpan or  search on metacpan

lib/Parse/Eyapp.pod  view on Meta::CPAN

    19  use warnings;
    20  use strict;
    21  use Calc;
    22  use T;
    23
    24  sub R::TERMINAL::info { $_[0]{attr} }
    25
    26  my $parser = new Calc(yyprefix => "R::");
    27                     # stdin, prompt              , read one line at time
    28  $parser->slurp_file('','Arithmetic expression: ', "\n");
    29
    30  my $t = $parser->YYParse;
    31
    32  unless ($parser->YYNberr) {
    33    print "\n***** Tree before the transformations ******\n";
    34    print $t->str."\n";
    35
    36    $t->s(@T::all);
    37    print "\n***** Tree after the transformations were applied ******\n";
    38    print $t->str."\n";
    39  }


running the program produces the following output:

  pl@nereida:~/LEyapp/examples/Eyapp$ ./foldand0rule9_4.pl
  Arithmetic expression: a = 2*3

  ***** Tree before the transformations ******
  R::ASSIGN(R::TERMINAL[a],R::TERMINAL[=],R::TIMES(R::NUM(R::TERMINAL[2]),R::TERMINAL[*],R::NUM(R::TERMINAL[3])))

  ***** Tree after the transformations were applied ******
  R::ASSIGN(R::TERMINAL[a],R::TERMINAL[=],R::NUM(R::TERMINAL[6]))

  pl@nereida:~/LEyapp/examples/Eyapp$ ./foldand0rule9_4.pl
  Arithmetic expression: a = 2*[3+b]

  Syntax error near '['.
  Expected one of these terminals: '-' 'NUM' 'VAR' '('


=head1 L<Parse::Eyapp::Scope>: SUPPORT FOR SCOPE ANALYSIS

See the documentation for L<Parse::Eyapp::Scope>

=head1 MISCELLANEOUS SUPPORT FUNCTIONS IN L<Parse::Eyapp::Base>
    
See the documentation in L<Parse::Eyapp::Base>


=head1 ENVIRONMENT
 
Remember to set the environment variable C<PERL5LIB>
if you decide to install C<Parse::Eyapp> at a location other than the standard.
For example, on a bash or sh:

  export PERL5LIB=/home/user/wherever_it_is/lib/:$PERL5LIB

on a C<csh> or C<tcsh>

  setenv PERL5LIB /home/user/wherever_it_is/lib/:$PERL5LIB

Be sure the scripts C<eyapp> and C<treereg> are in the execution PATH.
 
=head1 DEPENDENCIES
 
This distribution depends on the following modules:

=over

=item * L<List::Util>

=item * L<Data::Dumper>

=item * L<Pod::Usage>

=back 

It seems that L<List::Util> is in the core of Perl
distributions since version 5.73:

  > perl -MModule::CoreList -e 'print Module::CoreList->first_release("List::Util")'
  5.007003

and L<Data::Dumper> is also in the core since 5.5:

  > perl -MModule::CoreList -e 'print Module::CoreList->first_release("Data::Dumper")'
  5.005

and L<Pod::Usage> is also in the core since 5.6:

  > perl -MModule::CoreList -e 'print Module::CoreList->first_release("Pod::Usage")'
  5.006

=for none
  > perl -MModule::CoreList -e 'print Module::CoreList->first_release("Memoize")'
  5.007003

I also recommend the following modules:

=over

=item * L<Test::Pod>

=item * L<Test::Warn>

=item * L<Test::Exception>

=back

The dependence on  L<Test::Warn>, L<Test::Pod> and L<Test::Exception> is merely for
the execution of tests. If the modules aren't installed the tests
depending on them will be skipped.

=head1 INSTALLATION

To install it, follow the traditional mantra:

                                 perl Makefile.PL
                                 make
                                 make test