Beefy Boxes and Bandwidth Generously Provided by pair Networks
The stupid question is the question not asked
 
PerlMonks  

comment on

( #3333=superdoc: print w/replies, xml ) Need Help??

I concur wholeheartedly. Use objects and encapsulate the gory details.

My earlier post left the details out in the open. Here's how those details fit into pc88mxer's framework.

For each input file format (i.e. parse specification) you need to be able to create an input source object ...
package RecordParser::FixedWidth; # constructor takes the name of the source file sub new { my ( $class, $source ) = @_;
my $template; my @fields; my @column_specs = lookup_specs($source); for my $column_spec ( @column_specs ) { my ($field, $offset, $width) = @$column_spec{qw(field offset width)}; $template .= "\@${offset}A$width"; push @fields, $field; } open my $reader, '<', $source;
my $obj = { IO => $reader, template => $template, fields_ref => \@fields, }; bless $obj => $class; }
...whose ->next method will produce the next data record (or undef it there isn't any more.)
sub next { my ( $self ) = @_; my ($reader, $template, $fields_ref) = @$self{qw(IO template fields_ref)}; my @fields = @$fields_ref; my $record = <$reader>; return unless defined $record;
my %value_of; my @values = unpack($template, $record); @value_of{@fields} = @values;
The key decision will be what to use for your data record object. A good generic choice is to use a hash-ref.
return \%value_of; }

In reply to Re^2: framework for data parsing by Narveson
in thread framework for data parsing by sam700

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":



  • Are you posting in the right place? Check out Where do I post X? to know for sure.
  • Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
    <code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>
  • Snippets of code should be wrapped in <code> tags not <pre> tags. In fact, <pre> tags should generally be avoided. If they must be used, extreme care should be taken to ensure that their contents do not have long lines (<70 chars), in order to prevent horizontal scrolling (and possible janitor intervention).
  • Want more info? How to link or How to display code and escape characters are good places to start.
Log In?
Username:
Password:

What's my password?
Create A New User
Domain Nodelet?
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others having an uproarious good time at the Monastery: (3)
As of 2022-12-07 05:59 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    No recent polls found

    Notices?