The builtin {cargo|rail|road|tram}type functions do not work if the corresponding tables are defined by the user

[stormcone]

There is a topic on the forum that the cargotype function does not work: https://www.tt-forums.net/viewtopic.php?t=90428

I did some test and looks like that in functioncall.py the global constant tables are empty if the tables defined by the nml file: https://github.com/OpenTTD/nml/blob/bbe945ed348dfe19d284908983c8bb55e0d840ad/nml/expression/functioncall.py#L480C1-L485

I put the following commands after line 494:

    generic.print_dbg(6, global_constants.cargo_numbers)
    generic.print_dbg(6, global_constants.railtype_table)

If I define the cargotable and the railtypetable, then that is the output:

      {}
      {}

So looks like the tables are empty. If I do not define the railtypetable, the second table is not empty:

      {}
      {'RAIL': 0, 'MONO': 1, 'MGLV': 2}

Version

$ nmlc --version
0.7.4

Expected result: The attached nml file can be compiled

Actual result: nmlc ERROR: "test.nml", line 16: Parameter for railtype() must be a string literal that is also in your railtype table

Steps to reproduce:

• nmlc test.nml Output: nmlc ERROR: "test.nml", line 16: Parameter for railtype() must be a string literal that is also in your railtype table

• Edit the test.nml: comment out the railtypetable: // railtypetable { RAIL, ELRL, MONO, MGLV } nmlc test.nml Output: nmlc ERROR: "test.nml", line 24: Parameter for cargotype() must be a string literal that is also in your cargo table

• Comment out the cargotable and the cargotype_available if statements too:

// cargotable { PASS, MAIL, LVST }
// if (cargotype_available("LVST"))
// {
// 	item(FEAT_CARGOS, cargo_lvst, cargotype("LVST"))
// 	{ 
// 		property { weight: 12.0/16; }
// 	}
// }

nmlc test.nml Output: nmlc info: 0 sprites, 0 cached, 0 orphaned, 0 duplicates, 0 newly encoded (native) nmlc info: Railtype items: 1/64 nmlc info: Concurrent ActionD registers: 1/64 ("test.nml", line 14)

cargo_type_test.zip

[glx22]

Hmm order of events is annoying, builtin validation happens during parsing, while populating the tables happens during preprocessing.

It think the issue started with https://github.com/OpenTTD/nml/commit/93c8cfca515f9fdeecb5aafb60267d1cc88b1237 for cargotable, and with https://github.com/OpenTTD/nml/commit/1070b5d81ce24d9c3520bf942d4d3c1a99e05cde for railtypetable.

[glx22]

Named parameters seem to have a similar issue when used as 3rd and 4th arguments of item. They don't exist before preprocessing but item checks for them during parsing.