Re: [Module::Build] requires_one_of

[David Wheeler]

On Jul 19, 2004, at 9:24 AM, Randy W. Sims wrote:

features => {
  ...
  dbi_support => {
    description => "Can read & write databases",
    requires => {
      DBI >= 1.0,
      db_driver => q{ [mysql] || [pg] },
      [mysql] => {
        DBD::mysql => 1.5,
        DataTime::Format::mysql => 0
      },
      [pg] => {
        DBD::Pg => 0,
        DataTime::Format::Pg => 0
      },
    },
},

This way most of the parsing is already done; Most all the terms are already broken down into indivisible fields. It's more human readable (IMO), though, perhaps a little more verbose. The macros help diffuse the complexity of expressions.

Even less parsing:

features => {
  ...
  dbi_support => {
    description => "Can read & write databases",
    requires => {
      DBI >= 1.0,
      db_driver => [qw(mysql pg)],
      [mysql] => {
        DBD::mysql => 1.5,
        DataTime::Format::mysql => 0
      },
      [pg] => {
        DBD::Pg => 0,
        DataTime::Format::Pg => 0
      },
    },
},

Regards,

David

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