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require 'puppet/parser/ast/branch'
class Puppet::Parser::AST
# An AST object to call a function.
class Function < AST::Branch
associates_doc
attr_accessor :name, :arguments
@settor = true
def evaluate(scope)
# Make sure it's a defined function
unless @fname
raise Puppet::ParseError, "Unknown function %s" % @name
end
# Now check that it's been used correctly
case @ftype
when :rvalue:
unless Puppet::Parser::Functions.rvalue?(@name)
raise Puppet::ParseError, "Function '%s' does not return a value" %
@name
end
when :statement:
if Puppet::Parser::Functions.rvalue?(@name)
raise Puppet::ParseError,
"Function '%s' must be the value of a statement" %
@name
end
else
raise Puppet::DevError, "Invalid function type %s" % @ftype.inspect
end
# We don't need to evaluate the name, because it's plaintext
args = @arguments.safeevaluate(scope)
return scope.send("function_" + @name, args)
end
def initialize(hash)
@ftype = hash[:ftype] || :rvalue
hash.delete(:ftype) if hash.include? :ftype
super(hash)
@fname = Puppet::Parser::Functions.function(@name)
# Lastly, check the parity
end
end
end
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