On 05/21/11 23:53, Brendan Eich wrote:
That's accurate. But I discounted arrow functions because to be usable, to have
the syntax you show above, requires GLR parsing (if bottom up; top-down may be
easier, haven't proven it yet).
GLR parsing would be wild in ECMAScript due to the fact that the lexer is
dependent on the parser's current state. A GLR parser is working on a quantum
superposition of multiple states in parallel, so if it encounters a / then some
of the superposed states may direct the lexer to interpret it as a division
symbol while others direct it to start scanning a regular expression. So now
you need a quantum entanglement of lexers corresponding to the superposed
parser states the GLR parser is considering. Semicolon insertion would also be
be forced into quantum entanglement with the superposed parser states.
Do we really want to go there?
Waldemar
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