Module:Loop

This loop implementation loops over arguments in the form of somename1, somename2. It only expands wikitext afterwards which makes it safe to use with categories and other templates.

Usage: {{ #invoke:Loop | arguments | myArgumentName | [[Category:{{{myArgumentName$n$}}}]] }}

resulting in effectively {{#if: {{{myArgumentName1|}}}|[[Category:{{{myArgumentName1}}}]]| }} {{#if: {{{myArgumentName2|}}}|[[Category:{{{myArgumentName2}}}]]| }}...

---

local p = {} --p stands for package

function p.arguments( frame )
    local argumentName = frame.args[1]
    argumentName = mw.ustring.match(argumentName, "^%s*(.-)%s*$") -- trim spaces
    local text = frame.args[2]

    -- collect keys and order them
    local keys = {}
    for k in pairs(frame:getParent().args) do
        local from, to, match = string.find(k, "^"..argumentName.."(%d+)$")
        if from ~= nil then
            table.insert(keys, tonumber(match))
        end
        
    end
    table.sort(keys)

    local result = "";
    for i = 1, #keys do
        local name = argumentName..keys[i]
        local parsed = mw.ustring.gsub( text, "{{{ *"..argumentName.." *}}}", "{{{"..name .."}}}" )
        parsed = mw.ustring.gsub( parsed, "{{{ *"..argumentName.."%$n%$ *}}}", "{{{"..name.."}}}" )
        result = result .. "{{#if: {{{"..name.."|}}}|"..parsed.."| }}"
    end
    return frame:getParent():preprocess(result)
end

function p.matches( frame )
    local input = frame.args[1]
    local pattern = frame.args[2]
    local replace = frame.args[3]
    
    local result = "";
    for match in mw.ustring.gmatch(input, pattern) do
    	result = result .. mw.ustring.gsub(replace, "%%1", match);
    end
    return frame:getParent():preprocess(result)
end

return p