develooper Front page | perl.recdescent | Postings from April 2009

How to know where I am going wrong in writing the grammar

From:
luzer poor
Date:
April 4, 2009 08:12
Subject:
How to know where I am going wrong in writing the grammar
Message ID:
7feb788d0904040812icd43164m712684af9484bdef@mail.gmail.com
Hi,
Having a lot of pain with the code [last reply on PM @
http://www.perlmonks.org/index.pl?node_id=754947] below:

---code start

#!/usr/bin/perl -w

use strict;
use warnings;
#use diagnostics;

use Parse::RecDescent;
use Data::Dumper;

# Enable warnings within the Parse::RecDescent module.

$::RD_ERRORS = 1; # Make sure the parser dies when it encounters an error
$::RD_WARN   = 1; # Enable warnings. This will warn on unused rules &c.
$::RD_HINT   = 1; # Give out hints to help fix problems.
#$::RD_TRACE  = 1; # Trace of parser

#$::AUTOSTUB = 1;

my $grammar = <<'_EOGRAMMAR_';
 {
use strict;
   use warnings;
  }
#{ our $errortext = ''; our $errorprefix = '';}
RECORDSTART    : /^(RECORD)[\r\n]+/
  {
 #print "\n[*] RECORDSTART -> " . $item[1];
 $1;
#$item[1];
}

RECORDEND  : /^(\.)[\r\n]*/
#/\./
  {
 #print "\n[*] RECORDEND -> " . $item[1] . "\n";
 $1;
#$item[1];
}

fieldName : /[^ \t\n]+/
{
#print "\n[*] fieldName -> $item[1]\n";
 $item[1];
}

metaName  : /[^ \t\n]+\n?/
{
$item[1];
}

metaFieldValue: /([^\n]*)\n/
{
$1;
}

fieldValue: /([^\n]*)\n/
{
#print "[*] fieldValue -> $item[1] ($1)\n";
$1;
}

field  : /^F/ fieldName fieldValue
{
#print "[*] Got field named \'" . $item{ fieldName } . '\' with value \'' .
$item{ fieldValue } . "\'\n";
#print "[*] Got metafield named \'" . $item[2] . '\' with value \'' .
$item[3] . "\'\n";
#print Data::Dumper->Dump([$text], ["fieldStuff"]);
$return = { fieldName => $item[2], fieldValue => $item[3]};
}

metaField : /^\#/ metaName metaFieldValue
{
#print "[*] Got metafield named \'" . $item{ metaName } . '\' with value \''
. $item{ metaFieldValue } . "\'\n";
#print "[*] Got metafield named \'" . $item[2] . '\' with value \'' .
$item[3] . "\'\n";
 $return = { metaName => $item[2], metaFieldValue => $item[3]};
}
 recordBody : field(s)
{
print "\n[*] field(s)\n";
 #print main::Dumper \@item;
#print Data::Dumper->Dump([@item], ["field(s)"]);

$return = 'field(s)';
 #if((length($text) > 3) && (0 == @item))
if(length($text) > 2)
{
$return = undef;
}
}
            |
metaField(s)
{
print "\n[*] metaField(s)\n";
 #print main::Dumper \@item;
#print Data::Dumper->Dump([@item], ["metaField(s)"]);
 $return = 'metaField(s)';
 #if((length($text) > 3) && (0 == @item))
if(length($text) > 2)
{
$return = undef;
}
}
|
<error>
#<error: I am confused in recordBody at $thisoffset!>

 #startOfRecord: RECORDSTART recordBody(s /$/) RECORDEND
 startOfRecord: RECORDSTART recordBody RECORDEND
 #startOfRecord: RECORDSTART ( metaField(s) field(s) ) RECORDEND
 #startOfRecord: RECORDSTART ( field(s) metaField(s) ) RECORDEND
  {
  #print main::Dumper \@item;
  $return = 'something';
 #$return = $item[1];
 1;
}
  |
 #<error>
<error: I could not even parse a line line starting at $thisoffset!>
_EOGRAMMAR_

#$skeletonPattern = "#input_type[ \t]*";
#my $metaFieldPattern = qr/[ \t]*#([^ \t]+)[ \t]+(.*)/o; # "#input_type
SCDR+", "#filename processed_01_20080616001403.cdr", etc
#my $normalFieldPattern = qr/([ \t]*)([0-9]*)F[ \t]+([^ \t]+)[ \t]+([^
\t\r\n]+)(.*)/; # "1F S_Diagnostic1 62" OR " F S_Diagnostic1 62" OR " F
S_Diagnostic1 62" are synonymous, etc

my $testData0 = <<'_EOGTESTA_';
RECORD
F ptc_record_length 00B6
F ptc_charging_start_time 20090604093721
F ptc_charging_end_time 20080604093721
F ptc_called_msrn_ton FF
F ptc_term_mcz_duration 060000
.
_EOGTESTA_

my $testData1 = <<'_EOGTESTA_';
RECORD
#input_id 91210758171x001_0013
#input_type PTC
#output_type MTC
#source_id 01
#filename TTFILE01-0001-20080101000000
#jingalama valuewith#inIt andaSpace
.
_EOGTESTA_

my $testData2 = <<'_EOGTESTA_';
RECORD
F ptc_record_length 00B6
F ptc_charging_start_time 20090604093721
F ptc_charging_end_time 20080604093721
F ptc_called_msrn_ton FF
F ptc_term_mcz_duration 060000
#input_id 91210758171x001_0013
#input_type PTC
#output_type MTC
#source_id 01
#filename TTFILE01-0001-20080101000000
#jingalama valuewith#inIt andaSpace
.
_EOGTESTA_

my $testData3 = <<'_EOGTESTA_';
RECORD
#input_id 91210758171x001_0013
#input_type PTC
#output_type MTC
#source_id 01
#filename TTFILE01-0001-20080101000000
#jingalama valuewith#inIt andaSpace
F ptc_record_length 00B6
F ptc_charging_start_time 20090604093721
F ptc_charging_end_time 20080604093721
F ptc_called_msrn_ton FF
F ptc_term_mcz_duration 060000
.
_EOGTESTA_

my $testData4 = <<'_EOGTESTA_';
RECORD
#input_id 91210758171x001_0013
#output_id
#input_type PTC
#output_type PTC
#addkey
#source_id 01
#filename TTFILE01-0001-20080101000000
F ptc_record_length 00B6
F ptc_record_type
F ptc_charging_start_time 20090604093721
F ptc_charging_end_time 20080604093721
F ptc_called_msrn_ton FF
F ptc_term_mcz_duration 060000
F ptc_term_mcz_change_direction
.
_EOGTESTA_

my $parser = Parse::RecDescent->new($grammar) or die "Bad grammar!\n";;

print $testData0, "\n\n";
$parser->startOfRecord($testData0) ? print "Parsing done sucessfully!\n" :
print "Bad input!\n";

print $testData1, "\n\n";
$parser->startOfRecord($testData1) ? print "Parsing done sucessfully!\n" :
print "Bad input!\n";

print $testData2, "\n\n";
$parser->startOfRecord($testData2) ? print "Parsing done sucessfully!\n" :
print "Bad input!\n";

print $testData3, "\n\n";
$parser->startOfRecord($testData3) ? print "Parsing done sucessfully!\n" :
print "Bad input!\n";

print $testData4, "\n\n";
$parser->startOfRecord($testData4) ? print "Parsing done sucessfully!\n" :
print "Bad input!\n";

#$parser->startOfRecord($testData) ? print "Parsing done sucessfully!" : die
"Bad input!\n";

---code end

Here is STDOUT:

RECORD
F ptc_record_length 00B6
F ptc_charging_start_time 20090604093721
F ptc_charging_end_time 20080604093721
F ptc_called_msrn_ton FF
F ptc_term_mcz_duration 060000
.



[*] field(s)
Parsing done sucessfully!
RECORD
#input_id 91210758171x001_0013
#input_type PTC
#output_type MTC
#source_id 01
#filename TTFILE01-0001-20080101000000
#jingalama valuewith#inIt andaSpace
.



[*] metaField(s)
Parsing done sucessfully!
RECORD
F ptc_record_length 00B6
F ptc_charging_start_time 20090604093721
F ptc_charging_end_time 20080604093721
F ptc_called_msrn_ton FF
F ptc_term_mcz_duration 060000
#input_id 91210758171x001_0013
#input_type PTC
#output_type MTC
#source_id 01
#filename TTFILE01-0001-20080101000000
#jingalama valuewith#inIt andaSpace
.



[*] field(s)
Bad input!
RECORD
#input_id 91210758171x001_0013
#input_type PTC
#output_type MTC
#source_id 01
#filename TTFILE01-0001-20080101000000
#jingalama valuewith#inIt andaSpace
F ptc_record_length 00B6
F ptc_charging_start_time 20090604093721
F ptc_charging_end_time 20080604093721
F ptc_called_msrn_ton FF
F ptc_term_mcz_duration 060000
.



[*] metaField(s)
Bad input!
RECORD
#input_id 91210758171x001_0013
#output_id
#input_type PTC
#output_type PTC
#addkey
#source_id 01
#filename TTFILE01-0001-20080101000000
F ptc_record_length 00B6
F ptc_record_type
F ptc_charging_start_time 20090604093721
F ptc_charging_end_time 20080604093721
F ptc_called_msrn_ton FF
F ptc_term_mcz_duration 060000
F ptc_term_mcz_change_direction
.



[*] metaField(s)
Bad input!

Here's STDERR:

print() on closed filehandle ERROR at C:/laPerl/site/lib/Parse/RecDescent.pm
line 2905.
Variable "$errortext" is not available at
C:/laPerl/site/lib/Parse/RecDescent.pm line 2906.
Variable "$errorprefix" is not available at
C:/laPerl/site/lib/Parse/RecDescent.pm line 2906.
Use of uninitialized value $errorprefix in formline at
C:/laPerl/site/lib/Parse/RecDescent.pm line 2850.
Use of uninitialized value $errortext in formline at
C:/laPerl/site/lib/Parse/RecDescent.pm line 2850.
Use of uninitialized value $errortext in formline at
C:/laPerl/site/lib/Parse/RecDescent.pm line 2852.
write() on closed filehandle ERROR at C:/laPerl/site/lib/Parse/RecDescent.pm
line 2906.
...

Any suggestions? I am really confused here?

Can anyone figure out what is going wrong (except the choice of ActivePerl
5.10 and WinXP SP2)?



nntp.perl.org: Perl Programming lists via nntp and http.
Comments to Ask Bjørn Hansen at ask@perl.org | Group listing | About