Jira (PUP-6818) Promote scope_param to the public API (currently in Puppet::Functions::InternalFunction)

Title: Message Title

PUP-6818

for reference here is my new function:

# Runs a [lambda](http://docs.puppetlabs.com/puppet/latest/reference/lang_lambdas.html)

# repeatedly for each local component.

# @example Utilisation de nantes_each_local_component

# ~~~ puppet

# $stacks = {

#   '-i' => { # ou gaston-i

#     'rproxy_interne-pp' => ['uvinct459', 'uvinct460'],

#     'lemonldap-pp'      => ['uvinct511', 'uvinct512'],

#     'appli-i'           => ['uvinct495'],

#   }

# }

# $stacks.nantes_each_local_component |$appli_name, $instance_suffix, $component_type, $component_suffix, $component_nodes| {

#   case $component_type {

#     'rproxy_interne': {

#       # ...

#     }

#     default: {

#       fail("Unknown \$component_type: ${component_type}")

#     }

#   }

# }

# ~~~

# @since 4.0.0

Puppet::Functions.create_function(:nantes_each_local_component, Puppet::Functions::InternalFunction) do

  dispatch :foreach_Hash do

    param 'Hash[String, Hash[String, Array[String]]]', :hash

    block_param 'Callable[5,5]', :block

end

  def foreach_Hash(hash)

    hostname = closure_scope.lookupvar('::hostname')

    raise ArgumentError, "Unable to get hostname" if hostname.nil? or hostname.empty?

    regex = Regexp.new(/^(!?)(([a-z][a-z0-9_]*)?)((-[a-z0-9-]+)?)$/)

    hash.each do |instance_name, instance_components|

      if regex.match(instance_name).nil? then

        raise ArgumentError, "Unable to parse instance_name: #{instance_name}"

      else

        appli_name = $2

        instance_suffix = $4

        instance_components.each do |component_name, component_nodes|

          if regex.match(component_name).nil? or $2.empty? then

            raise ArgumentError, "Unable to parse component_name: #{component_name}"

          else

            component_type = $2

            component_suffix = $4

            if component_nodes.include?(hostname) then

              yield(appli_name, instance_suffix, component_type, component_suffix, component_nodes)

end

end

end

end

end

end

end

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