【进阶实战】摆摊搜索：摊位商品的跨区查询接口封装

local stallIndex = {}
local function registerGoods(stallId, item, price)
    stallIndex[item .. "#" .. stallId] =
        { stall = stallId, item = item, price = price }
end
local function unregisterGoods(stallId, item)
    stallIndex[item .. "#" .. stallId] = nil
end
local function searchGoods(keyword, minPrice, maxPrice)
    local out = {}
    for _, g in pairs(stallIndex) do
        if string.find(g.item, keyword, 1, true)
            and g.price >= minPrice and g.price <= maxPrice then
            out[#out + 1] = g
        end
    end
    table.sort(out, function(a, b)
        return a.price < b.price
    end
    )
    return out
end

local rows = searchGoods("超级金创药", 1000, 5000)
for i, g in ipairs(rows) do
    sendmsg(nil, 1, i .. ". " .. g.stall .. " 号摊 " .. g.price .. " 金币")
end