* How to define such a function in lua? Sorry I don't have a name on it.
@ 2008-12-04 6:10 Zhichu Chen
2008-12-04 9:28 ` Hans Hagen
0 siblings, 1 reply; 6+ messages in thread
From: Zhichu Chen @ 2008-12-04 6:10 UTC (permalink / raw)
To: mailing list for ConTeXt users
Hi,
I'm learning to use luatex these days, one day actually. It's very
interesting. Although reference manuals are available, I still don't
know how to implement my designation.
The thing is, I know there's a "self" variable for object-oriented
programming, like
==================================================================
\startluacode
testdata = { a = 0,
b = 0,
c = 0,
plus = function (self)
self.c = self.a + self.b
end
}
mytest = testdata
mytest.a=10
mytest.b=100
mytest:plus()
tex.print(mytest.c)
\stopluacode
==================================================================
OK, but what if I wanna do something more, like substract? I would
like to use another object, like
==================================================================
\startluacode
testdata = { a = 0,
b = 0,
c = 0,
calc = Calc
}
Calc = { plus = function (self)
self.c = self.a + self.b
end,
substract = function (self)
self.c = self.a - self.b
end
}
mytest = testdata
mytest.a=10
mytest.b=100
mytest.calc:plus()
tex.print(mytest.c)
\stopluacode
==================================================================
Of course this won't work, for the "self" in Calc refers to mytest.calc
rather than mytest. How to implement things like that?
Thanks in advance.
--
Best Regards
Chen
----------------------------------------------------------------
Zhi-chu Chen | Shanghai Synchrotron Radiation Facility
No. 2019 | Jialuo Rd. | Jiading | Shanghai | P.R. China
tel: 086 21 5955 3405 | zhichu.chen.googlepages.com
| www.sinap.ac.cn
----------------------------------------------------------------
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___________________________________________________________________________________
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: How to define such a function in lua? Sorry I don't have a name on it.
2008-12-04 6:10 How to define such a function in lua? Sorry I don't have a name on it Zhichu Chen
@ 2008-12-04 9:28 ` Hans Hagen
2008-12-04 10:17 ` Zhichu Chen
0 siblings, 1 reply; 6+ messages in thread
From: Hans Hagen @ 2008-12-04 9:28 UTC (permalink / raw)
To: mailing list for ConTeXt users
Zhichu Chen wrote:
> Hi,
>
> I'm learning to use luatex these days, one day actually. It's very
> interesting. Although reference manuals are available, I still don't
> know how to implement my designation.
>
> The thing is, I know there's a "self" variable for object-oriented
> programming, like
> ==================================================================
> \startluacode
> testdata = { a = 0,
> b = 0,
> c = 0,
> plus = function (self)
> self.c = self.a + self.b
> end
> }
> mytest = testdata
> mytest.a=10
> mytest.b=100
> mytest:plus()
> tex.print(mytest.c)
> \stopluacode
> ==================================================================
> OK, but what if I wanna do something more, like substract? I would
> like to use another object, like
> ==================================================================
> \startluacode
> testdata = { a = 0,
> b = 0,
> c = 0,
> calc = Calc
> }
> Calc = { plus = function (self)
> self.c = self.a + self.b
> end,
> substract = function (self)
> self.c = self.a - self.b
> end
> }
> mytest = testdata
> mytest.a=10
> mytest.b=100
> mytest.calc:plus()
> tex.print(mytest.c)
> \stopluacode
> ==================================================================
> Of course this won't work, for the "self" in Calc refers to mytest.calc
> rather than mytest. How to implement things like that?
Calc = { add = function (self)
self.c = self.a + self.b
end,
substract = function (self)
self.c = self.a - self.b
end
}
testdata = { a = 0,
b = 0,
c = 0,
calc = function(self,f) return Calc[f](self) end
}
mytest = testdata
mytest.a=10
mytest.b=100
Calc.add(testdata)
print(mytest.c)
testdata:calc("substract")
print(mytest.c)
but it might make more sense to look into metatables (i assume that you
own the programming in lua book which explains that)
Hans
-----------------------------------------------------------------
Hans Hagen | PRAGMA ADE
Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
tel: 038 477 53 69 | fax: 038 477 53 74 | www.pragma-ade.com
| www.pragma-pod.nl
-----------------------------------------------------------------
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!
maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage : http://www.pragma-ade.nl / http://tex.aanhet.net
archive : https://foundry.supelec.fr/projects/contextrev/
wiki : http://contextgarden.net
___________________________________________________________________________________
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: How to define such a function in lua? Sorry I don't have a name on it.
2008-12-04 9:28 ` Hans Hagen
@ 2008-12-04 10:17 ` Zhichu Chen
2008-12-05 0:05 ` Arthur Reutenauer
0 siblings, 1 reply; 6+ messages in thread
From: Zhichu Chen @ 2008-12-04 10:17 UTC (permalink / raw)
To: mailing list for ConTeXt users
On Thu, Dec 4, 2008 at 5:28 PM, Hans Hagen <pragma@wxs.nl> wrote:
> Zhichu Chen wrote:
>> Hi,
>>
>> I'm learning to use luatex these days, one day actually. It's very
>> interesting. Although reference manuals are available, I still don't
>> know how to implement my designation.
>>
>> The thing is, I know there's a "self" variable for object-oriented
>> programming, like
>> ==================================================================
>> \startluacode
>> testdata = { a = 0,
>> b = 0,
>> c = 0,
>> plus = function (self)
>> self.c = self.a + self.b
>> end
>> }
>> mytest = testdata
>> mytest.a=10
>> mytest.b=100
>> mytest:plus()
>> tex.print(mytest.c)
>> \stopluacode
>> ==================================================================
>> OK, but what if I wanna do something more, like substract? I would
>> like to use another object, like
>> ==================================================================
>> \startluacode
>> testdata = { a = 0,
>> b = 0,
>> c = 0,
>> calc = Calc
>> }
>> Calc = { plus = function (self)
>> self.c = self.a + self.b
>> end,
>> substract = function (self)
>> self.c = self.a - self.b
>> end
>> }
>> mytest = testdata
>> mytest.a=10
>> mytest.b=100
>> mytest.calc:plus()
>> tex.print(mytest.c)
>> \stopluacode
>> ==================================================================
>> Of course this won't work, for the "self" in Calc refers to mytest.calc
>> rather than mytest. How to implement things like that?
>
> Calc = { add = function (self)
> self.c = self.a + self.b
> end,
> substract = function (self)
> self.c = self.a - self.b
> end
> }
>
> testdata = { a = 0,
> b = 0,
> c = 0,
> calc = function(self,f) return Calc[f](self) end
> }
>
> mytest = testdata
> mytest.a=10
> mytest.b=100
> Calc.add(testdata)
> print(mytest.c)
> testdata:calc("substract")
> print(mytest.c)
Thanks
>
> but it might make more sense to look into metatables (i assume that you
> own the programming in lua book which explains that)
I don't have one :(, I'll take a good at it later.
>
> Hans
>
>
> -----------------------------------------------------------------
> Hans Hagen | PRAGMA ADE
> Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
> tel: 038 477 53 69 | fax: 038 477 53 74 | www.pragma-ade.com
> | www.pragma-pod.nl
> -----------------------------------------------------------------
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to the Wiki!
>
> maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
> webpage : http://www.pragma-ade.nl / http://tex.aanhet.net
> archive : https://foundry.supelec.fr/projects/contextrev/
> wiki : http://contextgarden.net
> ___________________________________________________________________________________
>
--
Best Regards
Chen
----------------------------------------------------------------
Zhi-chu Chen | Shanghai Synchrotron Radiation Facility
No. 2019 | Jialuo Rd. | Jiading | Shanghai | P.R. China
tel: 086 21 5955 3405 | zhichu.chen.googlepages.com
| www.sinap.ac.cn
----------------------------------------------------------------
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!
maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage : http://www.pragma-ade.nl / http://tex.aanhet.net
archive : https://foundry.supelec.fr/projects/contextrev/
wiki : http://contextgarden.net
___________________________________________________________________________________
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: How to define such a function in lua? Sorry I don't have a name on it.
2008-12-04 10:17 ` Zhichu Chen
@ 2008-12-05 0:05 ` Arthur Reutenauer
2008-12-05 15:36 ` Zhichu Chen
0 siblings, 1 reply; 6+ messages in thread
From: Arthur Reutenauer @ 2008-12-05 0:05 UTC (permalink / raw)
To: Mailing list for ConTeXt users
>> but it might make more sense to look into metatables (i assume that you
>> own the programming in lua book which explains that)
>
> I don't have one :(, I'll take a good at it later.
You really should look into the book, it has a whole chapter about
object-oriented programming in Lua, and explains useful conventions.
Arthur
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!
maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage : http://www.pragma-ade.nl / http://tex.aanhet.net
archive : https://foundry.supelec.fr/projects/contextrev/
wiki : http://contextgarden.net
___________________________________________________________________________________
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: How to define such a function in lua? Sorry I don't have a name on it.
2008-12-05 0:05 ` Arthur Reutenauer
@ 2008-12-05 15:36 ` Zhichu Chen
2008-12-06 14:41 ` Yue Wang
0 siblings, 1 reply; 6+ messages in thread
From: Zhichu Chen @ 2008-12-05 15:36 UTC (permalink / raw)
To: Mailing list for ConTeXt users
On Fri, Dec 5, 2008 at 8:05 AM, Arthur Reutenauer
<arthur.reutenauer@normalesup.org> wrote:
>>> but it might make more sense to look into metatables (i assume that you
>>> own the programming in lua book which explains that)
>>
>> I don't have one :(, I'll take a good at it later.
>
> You really should look into the book, it has a whole chapter about
> object-oriented programming in Lua, and explains useful conventions.
Oh it's a long document. I almost took a day to finish it. I've got the main
idea now. Thanks.
I'm sorry, I got another question now. How to link two variables? Like if I
change one, the other would be changed as well. This may be a piece of cake
for you and please forgive my laziness.
>
> Arthur
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to the Wiki!
>
> maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
> webpage : http://www.pragma-ade.nl / http://tex.aanhet.net
> archive : https://foundry.supelec.fr/projects/contextrev/
> wiki : http://contextgarden.net
> ___________________________________________________________________________________
>
--
Best Regards
Chen
----------------------------------------------------------------
Zhi-chu Chen | Shanghai Synchrotron Radiation Facility
No. 2019 | Jialuo Rd. | Jiading | Shanghai | P.R. China
tel: 086 21 5955 3405 | zhichu.chen.googlepages.com
| www.sinap.ac.cn
----------------------------------------------------------------
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!
maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage : http://www.pragma-ade.nl / http://tex.aanhet.net
archive : https://foundry.supelec.fr/projects/contextrev/
wiki : http://contextgarden.net
___________________________________________________________________________________
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: How to define such a function in lua? Sorry I don't have a name on it.
2008-12-05 15:36 ` Zhichu Chen
@ 2008-12-06 14:41 ` Yue Wang
0 siblings, 0 replies; 6+ messages in thread
From: Yue Wang @ 2008-12-06 14:41 UTC (permalink / raw)
To: mailing list for ConTeXt users
variables are only symbols in lua.
they are reference to values (a place in the memory).
On 12/5/08, Zhichu Chen <zhichu.chen@gmail.com> wrote:
> On Fri, Dec 5, 2008 at 8:05 AM, Arthur Reutenauer
> <arthur.reutenauer@normalesup.org> wrote:
> >>> but it might make more sense to look into metatables (i assume that you
> >>> own the programming in lua book which explains that)
> >>
> >> I don't have one :(, I'll take a good at it later.
> >
> > You really should look into the book, it has a whole chapter about
> > object-oriented programming in Lua, and explains useful conventions.
>
> Oh it's a long document. I almost took a day to finish it. I've got the main
> idea now. Thanks.
>
> I'm sorry, I got another question now. How to link two variables? Like if I
> change one, the other would be changed as well. This may be a piece of cake
> for you and please forgive my laziness.
>
> >
> > Arthur
> > ___________________________________________________________________________________
> > If your question is of interest to others as well, please add an entry to the Wiki!
> >
> > maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
> > webpage : http://www.pragma-ade.nl / http://tex.aanhet.net
> > archive : https://foundry.supelec.fr/projects/contextrev/
> > wiki : http://contextgarden.net
> > ___________________________________________________________________________________
> >
>
>
>
> --
> Best Regards
> Chen
> ----------------------------------------------------------------
>
> Zhi-chu Chen | Shanghai Synchrotron Radiation Facility
> No. 2019 | Jialuo Rd. | Jiading | Shanghai | P.R. China
> tel: 086 21 5955 3405 | zhichu.chen.googlepages.com
> | www.sinap.ac.cn
> ----------------------------------------------------------------
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to the Wiki!
>
> maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
> webpage : http://www.pragma-ade.nl / http://tex.aanhet.net
> archive : https://foundry.supelec.fr/projects/contextrev/
> wiki : http://contextgarden.net
> ___________________________________________________________________________________
>
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!
maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage : http://www.pragma-ade.nl / http://tex.aanhet.net
archive : https://foundry.supelec.fr/projects/contextrev/
wiki : http://contextgarden.net
___________________________________________________________________________________
^ permalink raw reply [flat|nested] 6+ messages in thread
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2008-12-04 6:10 How to define such a function in lua? Sorry I don't have a name on it Zhichu Chen
2008-12-04 9:28 ` Hans Hagen
2008-12-04 10:17 ` Zhichu Chen
2008-12-05 0:05 ` Arthur Reutenauer
2008-12-05 15:36 ` Zhichu Chen
2008-12-06 14:41 ` Yue Wang
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