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A parser generator? Why oh why? It sounds so 80s. JavaScript is strong enough to express parser combinators, e.g. see Chris Double's implementation (also based on the PEG formalism):

http://www.bluishcoder.co.nz/2007/10/javascript-parser-combi...

I did the same thing in ActionScript. It's easy and fun.

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I believe that the classical generated parser has generally better performance potential - there is less function calling, less string passing (but this may be avoided easily in combinators too) and more opportunity for optimalization if you have the whole grammar AST in hand.

It was pointed out to me that my git repository hosting this code was down. I've now moved it to github if anyone was looking for it:

http://github.com/doublec/jsparse

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