On Oct 20, 2011, at 12:31 AM, Andreas Rossberg wrote:
> (Mh, actually, could we
> even distinguish between function declerations and expression
> statements starting with a function expr in LALR(1), without heavy
> grammar transformation?)
To answer this question, there's no way to disambiguate without a lookahead
restriction or massive duplication of the expression sub-grammar. You'd need
ExpressionStatement: ExpressionNoFunctionNoLeftCurlyAtFront
and ExpressionNoFunctionNoLeftCurlyAtFront would produce any expression except
those starting with 'function' or '{'. No win in duplicating so much grammar.
We'd rather use lookahead restrictions as the spec does currently, or
parametric productions as an alternative (would be nice to unduplicate the
-NoIn productions).
BTW there's still a de-facto standard lurking about on the web that expects
eval("function(){...}") to parse. I'm not sure where different engines stand on
this.
/be
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