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- Subject: Re: help to (slightly) modify Lua interpreter
- From: Francesco Abbate <francesco.bbt@...>
- Date: Thu, 5 Nov 2009 17:51:29 +0100
2009/11/5 Roberto Ierusalimschy <email@example.com>:
> Lua does not build an AST; it generates code on the fly. For the syntax
> part, you have to look at lparser.c, function 'primaryexp', case '['.
> But of course you must know what code you want to generate for that
> syntax. Do you plan to make m[i, j] the same as m[i][j]?
I'm planning to translate the code like that:
m[i, j] => __index(m, i, j)
m[i, j] = v => __newindex(m, i, j, v)
So all the indexes will be feeded to the __index or __newindex
metamethods in the order. I guess that the variable number of
arguments is not a problem: the metamethods are supposed to check how
many arguments and act accordingly.
The nested indexing method you was thinking about is complicated and
not interesting, I think.
So, for the parser modification I should be able to do it. I'm more
worried about the code generation. May be is not that difficult but I
will need some hints.