Re: No nesting in 5.1w6 ?
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- Subject: Re: No nesting in 5.1w6 ?
- From: Roberto Ierusalimschy <roberto@...>
- Date: 2005年5月19日 16:35:14 -0300
> > print [[a[[b]]c]]
> stdin:1: '=' expected near ']'
Are you sure?? It worked OK in my machine...
> print [[a[[b]]c]]
a[[b]]c
> > print [=[a[=[b]=]c]=]
> stdin:1: '=' expected near ']'
The LUA_COMPAT_LSTR=2 is only for compatibility, so it allows nesting
only for the simple case [[...]] (without equal signs).
> Is there something I have misunderstood?
The description of long brackets without nesting is conceptually much
simpler than with nesting. It is easy to write a Lua pattern to match
those elements; I believe other tools also can be simpler when there is
no nesting. For instance, a single *find* is enough to find for sure the
end of any long string.
> To be able to comment out chunks of code secure in the knowledge
> that already existing comments will not terminate the new comment
> prematurely, is surely vital for debugging, however questionable the
> practice formally.
In practice, using [==[ ... ]==] to comment out a piece of code will
work 99% of the time. In the other 1% cases, you get a clear error
message (so the earlier termination does not go unnoticed).
-- Roberto