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require 'puppet/parser/ast/definition'
class Puppet::Parser::AST
# The code associated with a class. This is different from definitions
# in that each class is a singleton -- only one will exist for a given
# node.
class HostClass < AST::Definition
@name = :class
# Are we a child of the passed class? Do a recursive search up our
# parentage tree to figure it out.
def child_of?(klass)
return false unless self.parentclass
if klass == self.parentobj
return true
else
return self.parentobj.child_of?(klass)
end
end
# Evaluate the code associated with this class.
def evaluate(options)
scope = options[:scope]
raise(ArgumentError, "Classes require resources") unless options[:resource]
# Verify that we haven't already been evaluated. This is
# what provides the singleton aspect.
if existing_scope = scope.compile.class_scope(self)
Puppet.debug "Class '%s' already evaluated; not evaluating again" % (classname == "" ? "main" : classname)
return nil
end
scope.compile.configuration.tag(self.classname)
pnames = nil
if pklass = self.parentobj
pklass.safeevaluate :scope => scope, :resource => options[:resource]
scope = parent_scope(scope, pklass)
pnames = scope.namespaces
end
# Don't create a subscope for the top-level class, since it already
# has its own scope.
unless options[:resource].title == :main
scope = subscope(scope, options[:resource])
end
if pnames
pnames.each do |ns|
scope.add_namespace(ns)
end
end
# Set the class before we do anything else, so that it's set
# during the evaluation and can be inspected.
scope.compile.class_set(self.classname, scope)
# Now evaluate our code, yo.
if self.code
return self.code.evaluate(:scope => scope)
else
return nil
end
end
def initialize(options)
@parentclass = nil
super
end
def parent_scope(scope, klass)
if s = scope.compile.class_scope(klass)
return s
else
raise Puppet::DevError, "Could not find scope for %s" % klass.classname
end
end
end
end
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