وحدة:CountryData/شرح

This module has three functions to extract data from country data templates (which are used for most flag templates).

 gettable

Extracts all parameters from a data template and returns them as a Lua table. This function is only usable from other Lua modules; invoke it using require('Module:CountryData').gettable(parameters).

The first parameter is the frame of the invoking module; the second is the country or other entity to get the data of. The optional third parameter is a table of parameters to pass into the data template; this may, for example, include |age= or |mw=, which are used in the values of some sports alias parameters. E.g.,

local data = require('Module:CountryData').gettable(frame,"France",{age="20",mw="men's"})

The function returns an empty table if a data template does not exist or does not conform to the standard structure.

 getalias

If used from wikicode, this function returns the value of a single field in a data template. The first parameter is the country or other entity whose data to return; the second is the name of the field. For example, {{#invoke:CountryData|getalias|France|flag alias}} → Flag of France.svg. The other parameters are |variant= to return a variant parameter value, with fallback to the main field value if the variant does not exist, and |def= for the fallback output if the wanted data template or field does not exist, the default for which is a literal "nil".

Note: This is likely not quicker than wikicode-only alternatives such as {{getalias}}, {{getalias2}} and {{pst name}}, because it transcludes the data template from Lua and converts it to a Lua table using the above function, picks the wanted parameter name, and returns it to wikicode, whereas other templates perform two simple non-Lua transclusions to get, in most cases, the same result. The Lua version does have the advantage that using it with a non-existing country data template returns "nil" (or the value of |def=) rather than a redlink to the data template. See a comparison of the four at User:SiBr₄/Flagg tests#Lua-based getalias.

 gettemplate

This function concatenates the fields of a data template into a string similar to what you get when transcluding it directly. It can be compared with a direct transclusion to test if a template is being converted to Lua correctly:

{{pre|{{Country data France}}}}
{{pre|{{#invoke:CountryData|gettemplate|France}}}}

gives

{{ {{{1}}}
| alias = فرنسا
| flag alias = Flag of France.svg
| flag alias-1790 = Flag of France (1790–1794).svg
| flag alias-1794 = Flag of France (1794–1815, 1830–1958).svg
| flag alias-1814 = Flag of the Kingdom of France (1814-1830).svg
| flag alias-1830 = Flag of France (1794–1815, 1830–1958).svg
| flag alias-1848 = Drapeau france 1848.svg
| flag alias-1848a = Drapeau france 1848.svg
| flag alias-1848b = Flag of France (1794–1815, 1830–1958).svg
| flag alias-1974 = Flag of France (lighter variant).svg
| flag alias-naval = Civil and Naval Ensign of France.svg
| flag alias-naval-1790 = Flag of French-Navy-Revolution.svg
| flag alias-air force = Flag of France.svg
| link alias-air force = القوات الجوية الفرنسية
| flag alias-coast guard = French Maritime Gendarmerie racing stripe.svg
| border-coast guard = 
| link alias-coast guard = حرس السواحل الفرنسي
| flag alias-army = Flag of France.svg
| link alias-army = الجيش الفرنسي
| link alias-naval = البحرية الفرنسية
| flag alias-navy = Civil and Naval Ensign of France.svg
| link alias-navy = French Navy
| size = 
| name = فرنسا
| altlink = 
| variant = 

}}

{{ {{{1}}}
| altlink = 
| flag alias-naval-1790 = Flag of French-Navy-Revolution.svg
| link alias-coast guard = حرس السواحل الفرنسي
| border-coast guard = 
| flag alias-1848 = Drapeau france 1848.svg
| flag alias = Flag of France.svg
| variant = 
| flag alias-1814 = Flag of the Kingdom of France (1814-1830).svg
| flag alias-1830 = Flag of France (1794–1815, 1830–1958).svg
| alias = فرنسا
| flag alias-1794 = Flag of France (1794–1815, 1830–1958).svg
| flag alias-army = Flag of France.svg
| flag alias-naval = Civil and Naval Ensign of France.svg
| flag alias-navy = Civil and Naval Ensign of France.svg
| flag alias-1848b = Flag of France (1794–1815, 1830–1958).svg
| name = فرنسا
| size = 
| flag alias-1848a = Drapeau france 1848.svg
| link alias-naval = البحرية الفرنسية
| flag alias-1974 = Flag of France (lighter variant).svg
| link alias-air force = القوات الجوية الفرنسية
| link alias-army = الجيش الفرنسي
| flag alias-coast guard = French Maritime Gendarmerie racing stripe.svg
| flag alias-1790 = Flag of France (1790–1794).svg
| flag alias-air force = Flag of France.svg
| link alias-navy = French Navy
}}

Note that, like with all Lua tables, the order of entries is not preserved, so the parameters are mixed up.