Re: [ANN] Lua 5.2.0 (beta-rc2) now available
[
Date Prev][
Date Next][
Thread Prev][
Thread Next]
[
Date Index]
[
Thread Index]
- Subject: Re: [ANN] Lua 5.2.0 (beta-rc2) now available
- From: Lorenzo Donati <lorenzodonatibz@...>
- Date: 2011年6月22日 06:57:58 +0200
On 22/06/2011 0.21, Luiz Henrique de Figueiredo wrote:
Lua 5.2.0 (beta-rc2) is now available at
http://www.lua.org/work/lua-5.2.0-beta-rc2.tar.gz
[snip]
I see that a constraint has been introduced so that a label cannot be
repeated inside the same function.
I've already argued on the other thread (5.2 beta-rc1) that I'd prefer a
limit "per-block". There I motivated my preference with an use case for
error management.
Now another use case comes to my mind, which will make "continue-fans"
less happy with goto. Please consider:
------------
local s = "apple banana kiwi pear apricot plum mango \*
papaya blackberry coconut strawberry"
local banned_letter = "p"
print( [[---- no "]] .. banned_letter .. [[" fruits ----]] )
for word in s:gmatch '%w+' do
if word:sub( 1, 1 ) == banned_letter then
goto continue
end
print( word )
::continue::
end
banned_letter = "a"
print( [[---- no "]] .. banned_letter .. [[" fruits ----]] )
for word in s:gmatch '%w+' do
if word:sub( 1, 1 ) == banned_letter then
goto continue2 -- I cannot reuse "continue" as label!!!
end
print( word )
::continue2::
end
---------------
So if the limit where per-block, it would be possible to reuse common
labels for common idioms.
-- Lorenzo