How to define such a function in lua? Sorry I don't have a name on it.
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 ----------------------------------------------------------------
Zhichu Chen wrote:
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 -----------------------------------------------------------------
On Thu, Dec 4, 2008 at 5:28 PM, Hans Hagen
-- 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 ----------------------------------------------------------------
On Fri, Dec 5, 2008 at 8:05 AM, Arthur Reutenauer
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.
-- 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 ----------------------------------------------------------------
participants (4)
-
Arthur Reutenauer
-
Hans Hagen
-
Yue Wang
-
Zhichu Chen