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-- <pre>
local lib = {}
 
function lib.mergeFrames(frame, parent)
    local args = {}
    if frame then
        for k,v in pairs(frame.args) do
            args[k] = v
        end
    end
    if parent then
        for k,v in pairs(parent.args) do
            args[k] = v
        end
    end
    return args
end
 
function lib.arguments(origArgs)
    local args = {}
    for k, v in pairs(origArgs) do
        if type(v) == 'string' then
            v = mw.text.trim(v)
        end
        if v ~= '' then
            args[k] = v
        end
    end
    return args
end
 
function lib.getSortedKeys(tab)
    local keys = {}
    for k,_ in pairs(tab) do
        keys[#keys+1] = k
    end
    table.sort(keys)
    return keys
end
 
function lib.groupedArguments(args, numeric)
    if numeric == nil then
        numeric = true
    end
    numeric = not not numeric
 
    local base = {}
    local groups = {}
 
    for k, v in pairs(args) do
        v = mw.text.trim(v) or ''
        if v ~= '' then
            if type(k) == 'string' then
                k = mw.text.trim(k) or ''
                if k ~= '' then
                    local split = mw.text.split(k, ':')
                    if #split == 1 then
                        base[k] = v
                    else
                        local group = mw.text.trim(split[1]) or ''
                        local key = mw.text.trim(table.concat(split, ':', 2)) or ''
                        if key ~= '' and group ~= '' then
                            if numeric then
                                group = tonumber(group)
                                if group ~= nil then
                                    if groups[group] == nil then
                                        groups[group] = {}
                                    end
                                    groups[group][key] = v
                                else
                                    base[k] = v
                                end
                            else
                                if groups[group] == nil then
                                    groups[group] = {}
                                end
                                groups[group][key] = v
                            end
                        else
                            base[k] = v
                        end
                    end
                end
            elseif v ~= '' then
                base[k] = v
            end
        end
    end
    return base, groups
end
 
function lib.ternary(cond, T, F)
    if cond then
        return T
    else
        return F
    end
end
 
function lib.tbl(tbl)
    return table.tostring(tbl)
end
 
-- Helper functions
function table.val_to_str(v)
    if "string" == type(v) then
        v = string.gsub(v, "\n", "\\n")
        if string.match(string.gsub(v, "[^'\"]", ""), '^"+$') then
            return "'" .. v .. "'"
        end
        return '"' .. string.gsub(v, '"', '\\"') .. '"'
    else
        return "table" == type(v) and table.tostring(v) or tostring(v)
    end
end
 
function table.key_to_str(k)
    if "string" == type(k) and string.match(k, "^[_%a][_%a%d]*$") then
        return k
    else
        return "[" .. table.val_to_str(k) .. "]"
    end
end
 
function table.tostring(tbl)
    local result, done = {}, {}
    for k, v in ipairs(tbl) do
        table.insert(result, table.val_to_str(v))
        done[k] = true
    end
    for k, v in pairs(tbl) do
        if not done[k] then
            table.insert(result, table.key_to_str(k) .. "=" .. table.val_to_str( v ))
        end
    end
    return "{" .. table.concat(result, ",") .. "}"
end
 
return lib
-- </pre>
-- [[Category:Lua]]
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