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Re^6: pack and unpack multiple arrays with one common repeat prefix

by hexcoder (Curate)
on Jun 16, 2017 at 07:29 UTC ( [id://1192913]=note: print w/replies, xml ) Need Help??


in reply to Re^5: pack and unpack multiple arrays with one common repeat prefix
in thread pack and unpack multiple arrays with one common repeat prefix

The idea/goal was to seperate the decoding engine (code) from the data structure descriptions (templates) in order to
  • decrease (inter)dependencies
  • reduce code by avoiding (slightly different) duplicates for different structures
  • So, I see your approach as the next best method, when I fail to express the structures with templates in a table. Using a table with handler functions is certainly the most flexible way allowing for very special decoding tasks.

    Thanks, hexcoder

    Replies are listed 'Best First'.
    Re^7: pack and unpack multiple arrays with one common repeat prefix
    by kcott (Archbishop) on Jun 17, 2017 at 06:45 UTC

      I'm glad to see that had, at least some, appeal.

      It was, as stated, somewhat "primitive". Expanding upon that a little, the following is more generally what I had in mind, which removes duplicate code and separates the "decoding engine (code)" (putting it into Decoupled.pm).

      The expanded script (note there's no change to the original while loop or input data):

      #!/usr/bin/env perl -l use strict; use warnings; use lib '.'; use Decoupled qw{ preprocess_complex_message handle_generic_message }; my %decode_type = ( A => sub { handle_generic_message( A => preprocess_complex_message($_[0]) ) }, B => sub { handle_generic_message(B => $_[0]) }, ); while (<DATA>) { chomp; my ($type, $msg) = split /\s+/, $_, 2; my $decoded = $decode_type{$type}->($msg); print $decoded; } __DATA__ B message B1 A more complex message A1 B message B2

      The Decoupled module:

      package Decoupled; use strict; use warnings; use Exporter 'import'; our @EXPORT_OK = qw{ preprocess_complex_message handle_generic_message }; sub preprocess_complex_message { $_[0] =~ /more complex (.*)/; $1 } sub handle_generic_message { sprintf "Do Type%s stuff with '%s'", @_ } 1;

      The new output:

      Do TypeB stuff with 'message B1' Do TypeA stuff with 'message A1' Do TypeB stuff with 'message B2'

      — Ken

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