NAME

Hash::Convert - Rule based Hash converter.

SYNOPSIS

  #!/usr/bin/env perl
  use strict;
  use warnings;
  use Hash::Convert;

  my $rules = {
      visit   => { from => 'created_at' },
      count   => { from => 'count', via => sub { $_[0] + 1 }, default => 1 },
      visitor => {
          contain => {
              name => { from => 'name' },
              mail => { from => 'mail' },
          },
          default => {
              name => 'anonymous',
              mail => 'anonymous',
          }
      },
      price => {
          from => [qw/item.cost item.discount/],
          via => sub {
              my $cost     = $_[0];
              my $discount = $_[1];
              return $cost * ( (100 - $discount) * 0.01 );
          },
      },
  };
  my $opts = { pass => 'locate' };

  my $converter = Hash::Convert->new($rules, $opts);

  my $before = {
      created_at => time,
      count      => 1,
      name       => 'hixi',
      mail       => 'hixi@cpan.org',
      locate     => 'JP',
      item => {
          name     => 'chocolate',
          cost     => 100,
          discount => 10,
      },
  };
  my $after = $converter->convert($before);
  print Dumper $after;
  #{
  #    'visitor' => {
  #        'mail' => 'hixi@cpan.org',
  #        'name' => 'hixi'
  #    },
  #    'count' => 2,
  #    'visit' => '1377019766',
  #    'price' => 90,
  #    'locate' => 'JP'
  #}

DESCRIPTION

Hash::Convert is can define hash converter based on the rules.

Function

convert

Convert hash structure from before value.

  my $rules = {
      mail => { from => 'email' }
  };
  my $converter = Hash::Convert->new($rules);
  my $before = { email => 'hixi@cpan.org' };
  my $after  = $converter->convert($before);
  #{
  #  mail => 'hixi@cpan.org',
  #}

Rules

Command

from
  my $rules = { visit => { from => 'created_at' } };
  #(
  #(exists $before->{created_at})?
  #    (visit => $before->{created_at}): (),
  #)
from + via

`via` add after method toward `from`. `via` can receive multiple args from `from`.

Single args

  my $rules = { version => { from => 'version', via => sub { $_[0] + 1 } } };
  #(
  #(exists $before->{version})?
  #    (version => sub {
  #        $_[0] + 1;
  #    }->($before->{version})): (),
  #)

Multi args

  my $rules = { price => {
      from => [qw/cost discount/],
      via => sub {
          my $cost     = $_[0];
          my $discount = $_[1];
          return $cost * (100 - $discount);
  }};
  #(
  #(exists $before->{item}->{cost} && exists $before->{item}->{discount})?
  #    (price => sub {
  #        my $cost = $_[0];
  #        my $discount = $_[1];
  #        return $cost * (100 - $discount);
  #    }->($before->{item}->{cost}, $before->{item}->{discount})): (),
  #)
contain
  my $rules = { visitor => {
      contain => {
          name => { from => 'name' },
          mail => { from => 'mail' },
      }
  }};
  #(
  #(exists $before->{name} && exists $before->{mail})?
  #    (visitor => {
  #    (exists $before->{mail})?
  #        (mail => $before->{mail}): (),
  #    (exists $before->{name})?
  #        (name => $before->{name}): (),
  #    }): (),
  #)

Others expression

default

default can add all command (`from`, `from`+`via`, `contain`) .

  my $rules = { visitor => {
      contain => {
          name => { from => 'name' },
          mail => { from => 'mail' },
      },
      default => {
          name => 'anonymous',
          mail => 'anonymous',
      }
  }};
  #(
  #(visitor => {
  #(exists $before->{mail})?
  #    (mail => $before->{mail}): (),
  #(exists $before->{name})?
  #    (name => $before->{name}): (),
  #}):
  #(visitor => {
  #  'name' => 'anonymous',
  #  'mail' => 'anonymous'
  #}),
  #)
dot notation

`dot notation` make available nested hash structure.

  my $rules = { price => {
      from => [qw/item.cost item.discount/],
      via => sub {
          my $cost     = $_[0];
          my $discount = $_[1];
          return $cost * ( (100 - $discount) * 0.01 );
      },
  }};
  #(
  #(exists $before->{item}->{cost} && exists $before->{item}->{discount})?
  #    (price => sub {
  #        my $cost = $_[0];
  #        my $discount = $_[1];
  #        return $cost * ( (100 - $discount) * 0.01 );
  #    }->($before->{item}->{cost}, $before->{item}->{discount})): (),
  #)

LICENSE

Copyright (C) Hiroyoshi Houchi.

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

AUTHOR

Hiroyoshi Houchi <hixi@cpan.org>