文件操作 - dig.rb

文件: /opt/puppetlabs/puppet/lib/ruby/vendor_ruby/puppet/parser/functions/dig.rb

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# frozen_string_literal: true

Puppet::Parser::Functions.newfunction(
  :dig,
  :type => :rvalue,
  :arity => -1,
  :doc => <<~DOC
    Returns a value for a sequence of given keys/indexes into a structure, such as
    an array or hash.
    This function is used to "dig into" a complex data structure by
    using a sequence of keys / indexes to access a value from which
    the next key/index is accessed recursively.

The first encountered `undef` value or key stops the "dig" and `undef` is returned.

An error is raised if an attempt is made to "dig" into
    something other than an `undef` (which immediately returns `undef`), an `Array` or a `Hash`.

**Example:** Using `dig`

```puppet
    $data = {a => { b => [{x => 10, y => 20}, {x => 100, y => 200}]}}
    notice $data.dig('a', 'b', 1, 'x')
    ```

Would notice the value 100.

This is roughly equivalent to `$data['a']['b'][1]['x']`. However, a standard
    index will return an error and cause catalog compilation failure if any parent
    of the final key (`'x'`) is `undef`. The `dig` function will return undef,
    rather than failing catalog compilation. This allows you to check if data
    exists in a structure without mandating that it always exists.

* Since 4.5.0
  DOC
) do |_args|
  Puppet::Parser::Functions::Error.is4x('dig')
end

文件操作 - dig.rb

文件: /opt/puppetlabs/puppet/lib/ruby/vendor_ruby/puppet/parser/functions/dig.rb

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