module Puppet::Interface::FaceCollection

   # File lib/puppet/interface/face_collection.rb
18 def self.[](name, version)
19   name = underscorize(name)
20   get_face(name, version) or load_face(name, version)
21 end

   # File lib/puppet/interface/face_collection.rb
 7 def self.faces
 8   unless @loaded
 9     @loaded = true
10     names = @loader.files_to_load(Puppet.lookup(:current_environment)).map do |fn|
11       ::File.basename(fn, '.rb')
12     end.uniq
13     names.each {|name| self[name, :current]}
14   end
15   @faces.keys.select {|name| @faces[name].length > 0 }
16 end

   # File lib/puppet/interface/face_collection.rb
55 def self.find_matching(range, versions)
56   versions.select { |v| range === v }.sort.last
57 end

   # File lib/puppet/interface/face_collection.rb
23 def self.get_action_for_face(name, action_name, version)
24   name = underscorize(name)
25 
26   # If the version they request specifically doesn't exist, don't search
27   # elsewhere.  Usually this will start from :current and all...
28   face = self[name, version]
29   return nil unless face
30   action = face.get_action(action_name)
31   unless action
32     # ...we need to search for it bound to an o{lder,ther} version.  Since
33     # we load all actions when the face is first references, this will be in
34     # memory in the known set of versions of the face.
35     (@faces[name].keys - [ :current ]).sort.reverse_each do |vers|
36       action = @faces[name][vers].get_action(action_name)
37       break if action
38     end
39   end
40 
41   return action
42 end

   # File lib/puppet/interface/face_collection.rb
45 def self.get_face(name, pattern)
46   return nil unless @faces.has_key? name
47   return @faces[name][:current] if pattern == :current
48 
49   versions = @faces[name].keys - [ :current ]
50   range = pattern.is_a?(SemanticPuppet::Version) ? SemanticPuppet::VersionRange.new(pattern, pattern) : SemanticPuppet::VersionRange.parse(pattern)
51   found = find_matching(range, versions)
52   return @faces[name][found]
53 end

    # File lib/puppet/interface/face_collection.rb
 60 def self.load_face(name, version)
 61   # We always load the current version file; the common case is that we have
 62   # the expected version and any compatibility versions in the same file,
 63   # the default.  Which means that this is almost always the case.
 64   #
 65   # We use require to avoid executing the code multiple times, like any
 66   # other Ruby library that we might want to use.  --daniel 2011-04-06
 67   if safely_require name then
 68     # If we wanted :current, we need to index to find that; direct version
 69     # requests just work as they go. --daniel 2011-04-06
 70     if version == :current then
 71       # We need to find current out of this.  This is the largest version
 72       # number that doesn't have a dedicated on-disk file present; those
 73       # represent "experimental" versions of faces, which we don't fully
 74       # support yet.
 75       #
 76       # We walk the versions from highest to lowest and take the first version
 77       # that is not defined in an explicitly versioned file on disk as the
 78       # current version.
 79       #
 80       # This constrains us to only ship experimental versions with *one*
 81       # version in the file, not multiple, but given you can't reliably load
 82       # them except by side-effect when you ignore that rule this seems safe
 83       # enough...
 84       #
 85       # Given those constraints, and that we are not going to ship a versioned
 86       # interface that is not :current in this release, we are going to leave
 87       # these thoughts in place, and just punt on the actual versioning.
 88       #
 89       # When we upgrade the core to support multiple versions we can solve the
 90       # problems then; as lazy as possible.
 91       #
 92       # We do support multiple versions in the same file, though, so we sort
 93       # versions here and return the last item in that set.
 94       #
 95       # --daniel 2011-04-06
 96       latest_ver = @faces[name].keys.sort.last
 97       @faces[name][:current] = @faces[name][latest_ver]
 98     end
 99   end
100 
101   unless version == :current or get_face(name, version)
102     # Try an obsolete version of the face, if needed, to see if that helps?
103     safely_require name, version
104   end
105 
106   return get_face(name, version)
107 end

    # File lib/puppet/interface/face_collection.rb
125 def self.register(face)
126   @faces[underscorize(face.name)][face.version] = face
127 end

    # File lib/puppet/interface/face_collection.rb
109 def self.safely_require(name, version = nil)
110   path = @loader.expand(version ? ::File.join(version.to_s, name.to_s) : name)
111   require path
112   true
113 
114 rescue LoadError => e
115   raise unless e.message =~ %r{-- #{path}$}
116   # ...guess we didn't find the file; return a much better problem.
117   nil
118 rescue SyntaxError => e
119   raise unless e.message =~ %r{#{path}\.rb:\d+: }
120   Puppet.err _("Failed to load face %{name}:\n%{detail}") % { name: name, detail: e }
121   # ...but we just carry on after complaining.
122   nil
123 end

    # File lib/puppet/interface/face_collection.rb
129 def self.underscorize(name)
130   unless name.to_s =~ /^[-_a-z][-_a-z0-9]*$/i then
131     #TRANSLATORS 'face' refers to a programming API in Puppet
132     raise ArgumentError, _("%{name} (%{class_name}) is not a valid face name") %
133         { name: name.inspect, class_name: name.class }
134   end
135 
136   name.to_s.downcase.split(/[-_]/).join('_').to_sym
137 end