class RKelly::Runtime

def call_function(function_name, *args)
  function = @scope[function_name].value
  @scope.new_scope { |chain|
    function.js_call(chain, *(args.map { |x|
      RKelly::JS::Property.new(:param, x)
    }))
  }.value
end

def define_function(function, &block)
  @scope[function.to_s].function = block
end

def execute(js)
  function_visitor  = Visitors::FunctionVisitor.new(@scope)
  eval_visitor      = Visitors::EvaluationVisitor.new(@scope)
  tree = @parser.parse(js)
  function_visitor.accept(tree)
  eval_visitor.accept(tree)
  @scope
end

def initialize
  @parser = Parser.new
  @scope  = ScopeChain.new
end