Class: Puppet::Parser::AST::BooleanOperator

Inherits:
Branch show all
Defined in:
lib/puppet/parser/ast/boolean_operator.rb

Instance Attribute Summary collapse

Attributes inherited from Branch

#children, #pin

Instance Method Summary collapse

Constructor Details

#initialize(hash) ⇒ BooleanOperator

Returns a new instance of BooleanOperator.

Raises:

  • (ArgumentError) 


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# File 'lib/puppet/parser/ast/boolean_operator.rb', line 40

def initialize(hash)
  super

  raise ArgumentError, "Invalid boolean operator #{@operator}" unless %w{and or}.include?(@operator)
end

Instance Attribute Details

#lval ⇒ Object 



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# File 'lib/puppet/parser/ast/boolean_operator.rb', line 7

def lval
  @lval
end

#operator ⇒ Object 



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# File 'lib/puppet/parser/ast/boolean_operator.rb', line 7

def operator
  @operator
end

#rval ⇒ Object 



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# File 'lib/puppet/parser/ast/boolean_operator.rb', line 7

def rval
  @rval
end

Instance Method Details

#each ⇒ Object

Iterate across all of our children.



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# File 'lib/puppet/parser/ast/boolean_operator.rb', line 10

def each
  [@lval,@rval,@operator].each { |child| yield child }
end

#evaluate(scope) ⇒ Object

Returns a boolean which is the result of the boolean operation of lval and rval operands



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# File 'lib/puppet/parser/ast/boolean_operator.rb', line 16

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