Hi,

I'm experienced in several programming languages, but Perl beats me /-: So I ask you people wiser than me for help.

I want to amend a Perl program (JSDoc) with new functionality. The basic task is simple: We have a deep structure and want to retrieve specific items, putting them into a new structure. The source structure looks like this (I stripped everything not relevant):

$VAR1  = {
  'classes' => [
    {
      'classid' => 'xmi.2',
      'classdescription' => undef,
      'methods' => [
        {
          'methoddescription' => '',
          'methodid' => 'xmi.77',
        }
      ],
      'attributes' => [
        {
          'attributedescription' => '',
          'attributeid' => 'xmi.75',
        }
      ],
    },
    {
      'classid' => 'xmi.3',
      'classdescription' => '',
      'methods' => [
        {
          'methoddescription' => '',
          'methodid' => 'xmi.82',
        }
      ],
      'attributes' => [],
    }
  ]
};

[download]
We want a flat list of ids and descriptions like this: 
$descriptions = [
  {
    'id' => 'xmi.2',
    'description' => undef,
  },
  {
    'id' => 'xmi.77',
    'description' => '',
  },
  {
    'id' => 'xmi.75',
    'description' => '',
  },
  {
    'id' => 'xmi.3',
    'description' => ''
  },
  {
    'id' => 'xmi.82',
    'description' => '',
  }
];

[download]
The basic flow is obvious: 
FOREACH class
  PUT classid, classdescription INTO descriptions
  FOREACH method
    PUT methodid, methoddescription INTO descriptions
  END FOREACH
  FOREACH attribute
    PUT attributeid, attributedescription INTO descriptions
  END FOREACH
END FOREACH

[download]

I've tried this for several hours now, but I got mixed up in arrays, hashes, pseudo-hashes, etc.

Any hints are greatly appreciated.

Niko

In reply to Retrieving data from deep structure by enikao

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