Re: Named loops and blocks for use with break

[Rici Lake <lua@...>]

On 5-Oct-05, at 10:34 AM, Rici Lake wrote:
> Here's the patch (against lua-5.1-alpha); comments are welcome.
>
> http://primero.ricilake.net/newloop.diff


For the benefit of the two or three people who might have downloaded 
that, I just put up a new version which fixes a (blush!) bug in the 
codegen for 'if' statements which create upvals. I also ported over my 
Lua implementation of SRFI-61 (which allows local bindings in 'if' 
conditions).

The revised diff actually has a couple of examples in the test/ 
directory; specifically command.lua which shows how the loop constructs 
work in practice. etc/lua.vim and etc/luaindent.vim will let you get 
syntax highlighting and indenting to work (more or less) in vim.

If you don't want to go to all that trouble, you can just look at the 
example program at <http://primero.ricilake.net/command.lua.html>; the 
syntax highlighting was generated by vim (I used :highlight link Repeat 
Special  to get the loops coloured differently.)

Despite the fact that it looks like I spent a lot of time on this, I'm 
not seriously proposing any of it; it was an interesting experiment 
with the Lua parser, mostly, and also I always feel that you actually 
have to *try* syntax to see if it works or not, rather than just 
reacting according to prior prejudice. In any event, it was just a few 
hours' work... the changes are only to the parser, which means that it 
could exist side-by-side with ordinary Lua if there were some way of 
plugging different parsers in.