As we all know,javascript is a lexical scope language.
Lexical analysis in addition to converting a sequence of characters
into a sequence of tokens , the scope is also determined when complete
lexical analysis.
how lexical analysis determines scope in detail?
scope chain ,variable declartion,function declartion .all is
determined?

free <sheng.yonggeng@gmail.com> writes:

> As we all know,javascript is a lexical scope language.
> Lexical analysis in addition to converting a sequence of characters
> into a sequence of tokens , the scope is also determined when complete
> lexical analysis.

Not necessarily (or even typically). The scope is typically determined
by the *parser*, based on the grammar. It's true that you can often
determine the scope boundaries by simply counting '{' and '}' tokens,
but it's pretty useless since you can't determine what identifiers
correspond to a variable at the tokenizer level.

Javascript is even worse because tokenization depends on parsing in
order to distinguish division and regexp literals, so you need
feedback from a parser in order to correctly peform lexical analysis.

> how lexical analysis determines scope in detail?

It doesn't.

> scope chain ,variable declartion,function declartion .all is
> determined?

None of this. That's a job for the parser.

/L
-- 
Lasse Reichstein Holst Nielsen
 'Javascript frameworks is a disruptive technology'