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- Subject: Re: number parsing question
- From: Luiz Henrique de Figueiredo <lhf@...>
- Date: Fri, 30 Apr 2010 10:55:04 -0300
> isn't '-' part of the Number terminal?
No.
> I don't think it is handled as an unary minus opcode applied on the absolute value described by the following digits.
It is. But Lua does constant folding and the unary minus opcode disappears.
Try luac -l -p - on
a = -34
a = - 34
a = -(34)
a = -(30+4)
All four lines generate the same bytecode:
LOADK 0 -2 ; -34
SETGLOBAL 0 -1 ; a
