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require 'puppet/parser/ast/definition'
# 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 Puppet::Parser::AST::HostClass < Puppet::Parser::AST::Definition
associates_doc
@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
# Make sure our parent class has been evaluated, if we have one.
def evaluate(scope)
if parentclass and ! scope.catalog.resource(self.class.name, parentclass)
parent_resource = parentobj.evaluate(scope)
end
# Do nothing if the resource already exists; this makes sure we don't
# get multiple copies of the class resource, which helps provide the
# singleton nature of classes.
if resource = scope.catalog.resource(self.class.name, self.classname)
return resource
end
super
end
# Evaluate the code associated with this class.
def evaluate_code(resource)
scope = resource.scope
# Verify that we haven't already been evaluated. This is
# what provides the singleton aspect.
if existing_scope = scope.compiler.class_scope(self)
Puppet.debug "Class '%s' already evaluated; not evaluating again" % (classname == "" ? "main" : classname)
return nil
end
pnames = nil
if pklass = self.parentobj
parent_resource = resource.scope.compiler.catalog.resource(self.class.name, pklass.classname)
# This shouldn't evaluate if the class has already been evaluated.
pklass.evaluate_code(parent_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 resource.title == :main
scope = subscope(scope, resource)
scope.setvar("title", resource.title)
scope.setvar("name", resource.name)
end
# Add the parent scope namespaces to our own.
if pnames
pnames.each do |ns|
scope.add_namespace(ns)
end
end
# Set the class before we evaluate the code, so that it's set during
# the evaluation and can be inspected.
scope.compiler.class_set(self.classname, scope)
# Now evaluate our code, yo.
if self.code
return self.code.safeevaluate(scope)
else
return nil
end
end
def parent_scope(scope, klass)
if s = scope.compiler.class_scope(klass)
return s
else
raise Puppet::DevError, "Could not find scope for %s" % klass.classname
end
end
end
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