use Parse::RecDescent;

my $grammar = q {
    varStatement:       'var' statements endofvar { $return = $item[2] }
    statements:         <leftop: statement ',' statement>
    statement:          var_name (operator assignvalue)(?) { $return = $item[1] }
    comma_values:       <leftop: assignvalue ',' assignvalue>

    assignvalue:        equality
                        | escapedRegex
                        | escapedQuote
                        | array_declaration
                        | numeric_value
                        | array_value
                        | object_value
                        | var_name

    array_declaration:  'new Array(' comma_values ')'
    array_value:        array_name '[' integer ']'

    equality:           '(' assignvalue equality_operator assignvalue ')'

    var_name:           /\w+/
    array_name:         /\w+/
    object_value:       /[A-Za-z0-9_.]+/

    numeric_value:      real_number | integer
    integer:            /\d+/
    real_number:        /\d+\.?\d*/

    escapedRegex:       '__REGEX__'
    escapedQuote:       '__QUOTE__'

    operator:           '='
    equality_operator:  '===' | '==' | '!='

    endofvar:           ';'
};

my @localDeclaredVars = <DATA>;
chomp @localDeclaredVars;

print "\n\n";
$parser = new Parse::RecDescent ($grammar) or die "*** Bad grammar!\n";
foreach my $localDeclaredVar (@localDeclaredVars) {
  print "$localDeclaredVar\n";
  my $test = $parser->varStatement($localDeclaredVar) or print "*** Bad text!!!\n";

  if ( ref($test) eq 'ARRAY' ) {
    print "==> ( @$test )\n";
  }
  else {
    print "==> $test\n";
  }
}

__END__
var myTest1 = 1;
var myTest2 = 2, myTest3 = 3, myTest4;
var myTest5 = new Array(__QUOTE__,__QUOTE__), myTest6;
var myTest7 =__REGEX__;
var myTest8 = myTest5.x;
var myTest9 = myTest[0], myTest10 = myTest[0];
var myTest11 = (myTest1 == myTest2);
var myTest12 = (myTest1 == myTest2), myTest13 = 2;
var myTest14 = (myTest1 == myTest2), myTest15;
var myTest16 = new Array(1, 2);
var myTest17, myTest18;

##</code><code>##

var myTest1 = 1;
==> ( myTest1 )
var myTest2 = 2, myTest3 = 3, myTest4;
==> ( myTest2 myTest3 myTest4 )
var myTest5 = new Array(__QUOTE__,__QUOTE__), myTest6;
==> ( myTest5 myTest6 )
var myTest7 =__REGEX__;
==> ( myTest7 )
var myTest8 = myTest5.x;
==> ( myTest8 )
var myTest9 = myTest[0], myTest10 = myTest[0];
==> ( myTest9 myTest10 )
var myTest11 = (myTest1 == myTest2);
==> ( myTest11 )
var myTest12 = (myTest1 == myTest2), myTest13 = 2;
==> ( myTest12 myTest13 )
var myTest14 = (myTest1 == myTest2), myTest15;
==> ( myTest14 myTest15 )
var myTest16 = new Array(1, 2);
==> ( myTest16 )
var myTest17, myTest18;
==> ( myTest17 myTest18 )