Any thoughts on whether (eval(a, b)) should be an invocation of the eval operator?
2010/1/8 Mike Samuel <[email protected]>: > Should it be the case that invoking unoverridden eval with 0 or 2 or > more arguments is an EvalError, regardless of whether the call is > direct or not? > > What is the behavior of > eval() > and > eval("alert('Hello, World!')", void 0) > ? > > Section 15.1.2.1 eval (x) specifies the behavior of the eval function > "When the eval function is called with one argument x, the > following steps are taken:" > but section 15.1.2.1.1 specifies the behavior of the eval operator > without mention to # of arguments > > "A direct call to the eval function is one that is expressed as a > CallExpression > that meets the following two conditions: > 1. The Reference that is the result of evaluating the > MemberExpression in the > CallExpression has an environment record as its base value and its > reference > name is "eval". > 2. The result of calling the abstract operation GetValue with that > Reference > as the argument is the standard built-in function defined in 15.1.2.1." > > Sections 10.4.2 Entering eval code, and later the addenda both switch > on the use of direct call but without any extra language about extra > parameters. > "15.1.2.1. Implementations are no longer permitted to restrict the > use of eval in > ways that are not a direct call. In addition, any invocation of > eval that is not a > direct call uses the global environment as its variable > environment rather than > the caller’s variable environment." > > > Since the direct call to eval distinction does not depend on the > number of arguments, it seems that > eval("alert('Hello, World!')", void 0) > should resolve alert in the local environment and ignore the second > and subsequent parameters. > And that the behavior of > (0, eval)("alert('Hello, World!')", void 0) > is undefined because there is no else clause in section 15.1.2.1. > _______________________________________________ es-discuss mailing list [email protected] https://mail.mozilla.org/listinfo/es-discuss
