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require 'puppet'
require 'puppet/parser/ast/branch'
class Puppet::Parser::AST
class BooleanOperator < AST::Branch
attr_accessor :operator, :lval, :rval
# Iterate across all of our children.
def each
[@lval,@rval,@operator].each { |child| yield child }
end
# Returns a boolean which is the result of the boolean operation
# of lval and rval operands
def evaluate(scope)
# evaluate the first operand, should return a boolean value
lval = @lval.safeevaluate(scope)
# return result
# lazy evaluate right operand
case @operator
when "and"
if Puppet::Parser::Scope.true?(lval)
rval = @rval.safeevaluate(scope)
Puppet::Parser::Scope.true?(rval)
else # false and false == false
false
end
when "or"
if Puppet::Parser::Scope.true?(lval)
true
else
rval = @rval.safeevaluate(scope)
Puppet::Parser::Scope.true?(rval)
end
end
end
def initialize(hash)
super
raise ArgumentError, "Invalid boolean operator #{@operator}" unless %w{and or}.include?(@operator)
end
end
end
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