[NTG-context] Luacode: Data File to Table

24 Oct 2019

      Hi All!

LuaMetaTeX, Version 2.00.0
ConTeXt  ver: 2019.10.10 18:15 MKIV beta  fmt: 2019.10.19  int: english/english

I'd like to transfer the entries in a data file to a Lua table according to [1].

Here a MWE of my data file, appended as file Rosi.lua:
--------------------------
Rosi{
      smrk         = "00-003",
      picture_file = "/home/sam/pictures/",
      picture_name = "00-003---1981---Provence.png",
      width_px     = "394",
      height_px    = "481",
}

Rosi{
      smrk         = "00-006",
      picture_file = "/home/sam/pictures/",
      picture_name = "00-006---1986---Eire.png",
      width_px     = "392",
      height_px    = "479",
}

And here is my MWE in Luacode:
------------------------------
\startluacode

   userdata = userdata or {}
   u = userdata

   function u.Hugo ( )

      local S = {}

      function Rosi (b)
         S [ b.smrk ] = {
                           [ "smrk" ]         = b.smrk,
                           [ "picture_file" ] = b.picture_file,
                           [ "picture_name" ] = b.picture_name,
                           [ "width_px" ]     = b.width_px,
                           [ "height_px" ]    = b.height_px,
	                }

         context ( 'function Rosi():   b.smrk = ', b.smrk )
	 context.par()

      end

      require ("Rosi")

   end

\stopluacode

\starttext

   \currenttime

   \def\Heidi%
      {\ctxlua{u.Hugo()}}

   \Heidi

\stoptext

The entries in Rosi.lua aren't recognized in Luacode! The output pdf is appended
as well.

Now the essential part of the MWE above in pure Lua. Here it works! Strange.
                                        -----------

   userdata = userdata or {}
   u = userdata

   function u.Hugo ( )

      S = {}
      function Rosi (b)

         S [ b.smrk ] = {
                           [ "smrk" ]         = b.smrk,
                           [ "picture_file" ] = b.picture_file,
                           [ "picture_name" ] = b.picture_name,
                           [ "width_px" ]     = b.width_px,
                           [ "height_px" ]    = b.height_px,
                        }

	 print ( "b.smrk = " .. b.smrk )

      end

      require ("Rosi")

      print ( S["00-003"]["width_px"], S["00-003"]["height_px"] )
      print ( S["00-006"]["width_px"], S["00-006"]["height_px"] )

   end

   u.Hugo ()

Please, what could be done?

Best wishes,
Rudolf

[1] Roberto Ierusalimschy: Programming in Lua, Fourth edition, chapter 15.1 Data Files

[NTG-context] Luacode: Data File to Table

Rudolf Bahr