Re: [ANN] metalua 0.4

["Leo Razoumov" <slonik.az@...>]

On 2/8/08, Leo Razoumov <slonik.az@gmail.com> wrote:
> On 2/8/08, Leo Razoumov <slonik.az@gmail.com> wrote:
> > On 2/8/08, Fabien <fleutot+lua@gmail.com> wrote:
> > > On Feb 8, 2008 12:56 AM, Leo Razoumov <slonik.az@gmail.com> wrote:
> > > >
> > > > How difficult is it to use MetaLua to augment Lua syntax with
> > > > Matlab/Octave matrix specific syntactic constructs.
> > > > For example, I would like to have something like that
> > > >
> > > > t={1:9:3} --> {1,4,7}  -- (inline iterative constructors)
> > > >
> > > However, your proposal will conflict with Lua syntax in many places:
> > > - ":" is the method invocation operator, which makes it hard to override
> > > after an expression
> >
> > Well, I was suggesting Matlab-like syntax in spirit not in "letter".> Of course, if a certain Matlab construct directly conflicts with Lua
> > it can and should be replaced.
> > On the other hand this particular case of ":" operator can be handled
> > in Lua with a minor change. Here is one possibility:
> >
> > Lua translates a:b(c) into  a[b](a,c). If one can make this rule to
> > include numbers as well we could have  1:9(3) to become 1[9](1,3). All
> > Lua numbers share common metatable that can have "__index" method
> > properly handle this call and return {1,4,7} table. IMHO, sequence
> > constructors in a form of 1:9(3) or 1:9() for default increment of 1
> > are already close enough to Matlab/Octave constructs 1:9:3 and 1:9.
>
> I apologize for sloppy wording. The relevant sentence should read:
>
> All Lua numbers share common metatable that can have "__index" method
> properly handle this call and return a function (with one upvalue 9).
> When called with arguments (1,3) this function will return table
> {1,3,9}.
>
> --Leo--

Still sleeping:-)

All Lua numbers share common metatable that can have "__index" method
properly handle this call and return a function (with one upvalue 9).
When called with arguments (1,3) this function will return table
{1,4,7}.

--Leo--