【ulua入门】log(打印)lua中的table数据

最新推荐文章于 2024-09-26 20:50:27 发布

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#ulua #lua #printTable #打印table

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本文介绍了一个Lua语言中用于打印复杂表格的实用函数。该函数能够递归地展示表格内容，并支持自定义显示深度及元表显示选项。通过具体示例展示了如何使用此函数来解析和显示表格数据。

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先上代码：

local function dump_value_(v)
    if type(v) == "string" then
        v = "\"" .. v .. "\""
    end
    return tostring(v)
end


-- 主要用于显示表格, 表格，标识,显示表格的深度，默认3级
function PrintTable(value, desciption, nesting, show_meta)
    if type(nesting) ~= "number" then nesting = 3 end

    show_meta = show_meta or false
    local lookupTable = {}
    local result = {}

    local traceback = string.split(debug.traceback("", 2), "\n")
    --print("dump from: " .. string.trim(traceback[3]))

    local function dump_(value, desciption, indent, nest, keylen)
        desciption =" <color=#FF00FF> ".. desciption.."</color>" or "<color=#bb5555> <table> </color>"
        local spc = ""
        if type(keylen) == "number" then
            spc = string.rep(" ", keylen - string.len(dump_value_(desciption)))
        end
        if type(value) ~= "table" then
            result[#result +1 ] = string.format("%s%s%s = %s", indent, dump_value_(desciption), spc, dump_value_(value))
        elseif lookupTable[tostring(value)] then
            result[#result +1 ] = string.format("%s%s%s = *REF*", indent, dump_value_(desciption), spc)
        else
            lookupTable[tostring(value)] = true
            if nest > nesting then
                result[#result +1 ] = string.format("%s%s = *MAX NESTING*", indent, dump_value_(desciption))
            else
                result[#result +1 ] = string.format("%s%s = {", indent, dump_value_(desciption))
                local indent2 = indent.."    "
                local keys = {}
                local keylen = 0
                local values = {}
                for k, v in pairs(value) do
                    keys[#keys + 1] = k
                    local vk = dump_value_(k)
                    local vkl = string.len(vk)

                    if vkl > keylen then keylen = vkl end
                    values[k] = v
                end
                table.sort(keys, function(a, b)
                    if type(a) == "number" and type(b) == "number" then
                        return a < b
                    else
                        return tostring(a) < tostring(b)
                    end
                end)
                for i, k in ipairs(keys) do
                    dump_(values[k], k, indent2, nest + 1, keylen)
                end
                result[#result +1] = string.format("%s}", indent)
            end
        end
    end
    dump_(value, desciption, "\n", 1)
    local outStr="";
    for i, line in ipairs(result) do
        outStr = outStr..line
    end
    log(outStr)
    return outStr
end

测试代码：

    local testTable = {}
    for i=1,10 do
        testTable[i] = i * 10 + 5
    end
    --第一个参数传入table，第二个参数为这个table的别名
    PrintTable(testTable, "TestTableValue")

输出效果图：