Hello everyone,
    I am researching WEBKIT and coming up against difficulty about Javascript 
parser。As I Know, WEBKIT of old version uses the bison parser to interpret 
javascript code. But WEBKIT of recently version doesn't uses bison parser. 
Instead, WEBKIT of recently version uses Top-To-Down Recursion parser.
    I have some details to add. 1) WEBKIT using bison parser has a source file 
named "Grammar.cpp". 2) I know WEBKIT with 38688 version number uses bison 
parser.
I hope someone can give me some explanation, thanks.
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