Re: Strange behaviour in hexadecimal numbers
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- Subject: Re: Strange behaviour in hexadecimal numbers
- From: KHMan <keinhong@...>
- Date: 2012年1月20日 01:32:19 +0800
On 1/20/2012 1:05 AM, Alexandra Barros wrote:
Hi all,
I stumbled upon a weird behaviour in hexadecimal constants in Lua
5.2.0 (and LuaJIT 2.0.0-beta8).
When adding a hexadecimal number ending with E it gives a "malformed
number" error, unless I insert a blank space between E and the plus
sign. Looks like the lexer is tokenizing it as an invalid floating
point number. Tests follow...
print(0xE)
14
print(0xE+9)
stdin:1: malformed number near '0xE+9'
print(0xE +9)
23
print(0xA+9)
19
Sorry, I was hasty. :-P I agree that it is not a hex float.
This is a limitation of the lexer. It grabs a lot but test the
kaboodle as one unit. Triggered by 'E', from llex.c:
do {
save_and_next(ls);
if (check_next(ls, "EePp")) /* exponent part? */
check_next(ls, "+-"); /* optional exponent sign */
} while (lislalnum(ls->current) || ls->current == '.');
Would be nice to have it fixed...
--
Cheers,
Kein-Hong Man (esq.)
Kuala Lumpur, Malaysia