| Subject: | Recdescent - Production Unit Fails Becoz of Empty Function |
| Date: | Fri, 12 Mar 2010 15:24:11 +0530 |
| To: | "bug-Parse-RecDescent [...] rt.cpan.org" <bug-Parse-RecDescent [...] rt.cpan.org> |
| From: | "Anand Venkatesan, ERS, HCLTech" <anand.vn [...] hcl.in> |
Hi,
I have a query regarding the return item and the function call inside the actions block of a production unit.
If nothing is returned from a production unit, the value of the last component of the production unit will be returned. But in my below program the production unit (declare_statement) got failed if nothing is returned, where a function call alone placed inside the action block and that function has nothing to execute (empty function).
But if I add any code in the empty function, the production unit got passed. Is it a bug or the normal behavior of the Rec-descent package?
Recdescent version : Parse-RecDescent-1.964
Perl Version : v5.8.8 built for MSWin32-x86-multi-thread
####### Program Starts ##########
use strict;
use warnings;
use Data::Dumper;
use Parse::RecDescent;
my $Parser = q{
statement : declare_statement
| return_statment
| <error: $text>
declare_statement : data_type var_name ';'
{
::process_declaration(@item);
}
return_statment : 'return' var_name ';'
var_name : /[_a-zA-Z0-9]+/
data_type : ('int' | 'char') {$return = $item[1];}
};
my $Data = join '', <DATA>;
my $C_Parser_Obj = Parse::RecDescent->new($Parser);
$C_Parser_Obj->statement($Data);
sub process_declaration
{
#Empty Function causes the Production Unit "declare_statement" To Fail!
#my (@Data) = @_; #uncomment this line to pass the production unit
}
__DATA__
int myvar;
return myvar;
####### Program Ends ##########
Thanks & Regards,
Anand V
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