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local p = {}
 
-- 获取每一格的背景颜色, 规则为:
-- 在奇数行: 深、浅交错; 在偶数行: 浅、深交错
function p.getBackgroundColor(i, perRow)
    local isEvenColumn = ((math.floor((i-1)/perRow)%2)==0)
    local delta = 0
    if not isEvenColumn then delta = 1 end
    if (((i-1)%perRow)+delta) % 2 == 1 then return nil end
    return '#e5ded6'
end
 
-- 构建一个数据项
function p.makeDataItem(frame, args) -- args: label, data, bgcolor
    return frame:expandTemplate{ title = 'Infobox/item/data', args = args }
end
 
-- 构建信息框中多行多列的数据项
function p.make()
    local frame = mw.getCurrentFrame()
    local parent = frame:getParent()
    local itemsPerRow = string.gsub(parent.args['row-items'] or '', '%s+', '')
    if itemsPerRow == 'flex' then
        itemsPerRow = 0
    else
        itemsPerRow = tonumber(itemsPerRow)
        if itemsPerRow == nil or itemsPerRow <= 0 then
            error('"row-items" should be either a positive integer or "flex" or empty (= "flex")')
        end
    end
 
 
    -- 将非空的未命名参数 (数据项) 的编号存入 unnamed 表中
    local count = 0
    local unnamed = {}
    for k, v in pairs(parent.args) do
        if tonumber(k) ~= nil and v ~= nil and string.gsub(v, '%s+', '') ~= '' then
            unnamed[#unnamed + 1] = k
        end
    end
 
    if #unnamed == 0 then return '' end
 
    local result = ''
 
    result = result .. '<div class="pi-item-wrap">'
    if itemsPerRow == 0 then
        -- flex
        for i = 1, #unnamed do
            result = result .. p.makeDataItem(frame, {
                label = parent.args['label' .. unnamed[i]],
                data = parent.args[unnamed[i]],
                bgcolor = p.getBackgroundColor(i, 65535),
            })
        end
    else
        local percentage = math.floor(10000 / itemsPerRow) / 100
        percentage = tostring(percentage) .. '%'
        for i = 1, #unnamed do
            result = result .. p.makeDataItem(frame, {
                label = parent.args['label' .. unnamed[i]],
                data = parent.args[unnamed[i]],
                bgcolor = p.getBackgroundColor(i, 65535),
                width = percentage,
            })
        end
    end
    result = result .. '</div>'
 
    return result
end
 
return p
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