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class Puppet::Parser::AST
# The parent class of all AST objects that contain other AST objects.
# Everything but the really simple objects descend from this. It is
# important to note that Branch objects contain other AST objects only --
# if you want to contain values, use a descendent of the AST::Leaf class.
class Branch < AST
include Enumerable
attr_accessor :pin, :children
# Yield each contained AST node in turn. Used mostly by 'evaluate'.
# This definition means that I don't have to override 'evaluate'
# every time, but each child of Branch will likely need to override
# this method.
def each
@children.each { |child|
yield child
}
end
# Initialize our object. Largely relies on the method from the base
# class, but also does some verification.
def initialize(arghash)
super(arghash)
# Create the hash, if it was not set at initialization time.
unless defined? @children
@children = []
end
# Verify that we only got valid AST nodes.
@children.each { |child|
unless child.is_a?(AST)
raise Puppet::DevError,
"child %s is a %s instead of ast" % [child, child.class]
end
}
end
end
end
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