class ExecJS::MustangRuntime::Context

def call(properties, *args)
  unbox @v8_context.eval(properties).call(*args)
rescue NoMethodError => e
  raise ProgramError, e.message
end

def eval(source, options = {})
  source = encode(source)
  if /\S/ =~ source
    unbox @v8_context.eval("(#{source})")
  end
end

def exec(source, options = {})
  source = encode(source)
  if /\S/ =~ source
    eval "(function(){#{source}})()", options
  end
end

def initialize(runtime, source = "")
  source = encode(source)
  @v8_context = ::Mustang::Context.new
  @v8_context.eval(source)
end

def unbox(value)
  case value
  when Mustang::V8::Array
    value.map { |v| unbox(v) }
  when Mustang::V8::Boolean
    value.to_bool
  when Mustang::V8::NullClass, Mustang::V8::UndefinedClass
    nil
  when Mustang::V8::Function
    nil
  when Mustang::V8::SyntaxError
    raise RuntimeError, value.message
  when Mustang::V8::Error
    raise ProgramError, value.message
  when Mustang::V8::Object
    value.inject({}) { |h, (k, v)|
      v = unbox(v)
      h[k] = v if v
      h
    }
  else
    value.respond_to?(:delegate) ? value.delegate : value
  end
end