模块:Chinese calendar

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local p = {}

-- 农历数据表
local lunarInfo = {
    0x04bd8,
    0x04ae0,
    0x0a570,
    0x054d5,
    0x0d260,
    0x0d950,
    0x16554,
    0x056a0,
    0x09ad0,
    0x055d2,
    0x04ae0,
    0x0a5b6,
    0x0a4d0,
    0x0d250,
    0x1d255,
    0x0b540,
    0x0d6a0,
    0x0ada2,
    0x095b0,
    0x14977,
    0x04970,
    0x0a4b0,
    0x0b4b5,
    0x06a50,
    0x06d40,
    0x1ab54,
    0x02b60,
    0x09570,
    0x052f2,
    0x04970,
    0x06566,
    0x0d4a0,
    0x0ea50,
    0x06e95,
    0x05ad0,
    0x02b60,
    0x186e3,
    0x092e0,
    0x1c8d7,
    0x0c950,
    0x0d4a0,
    0x1d8a6,
    0x0b550,
    0x056a0,
    0x1a5b4,
    0x025d0,
    0x092d0,
    0x0d2b2,
    0x0a950,
    0x0b557,
    0x06ca0,
    0x0b550,
    0x15355,
    0x04da0,
    0x0a5b0,
    0x14573,
    0x052b0,
    0x0a9a8,
    0x0e950,
    0x06aa0,
    0x0aea6,
    0x0ab50,
    0x04b60,
    0x0aae4,
    0x0a570,
    0x05260,
    0x0f263,
    0x0d950,
    0x05b57,
    0x056a0,
    0x096d0,
    0x04dd5,
    0x04ad0,
    0x0a4d0,
    0x0d4d4,
    0x0d250,
    0x0d558,
    0x0b540,
    0x0b6a0,
    0x195a6,
    0x095b0,
    0x049b0,
    0x0a974,
    0x0a4b0,
    0x0b27a,
    0x06a50,
    0x06d40,
    0x0af46,
    0x0ab60,
    0x09570,
    0x04af5,
    0x04970,
    0x064b0,
    0x074a3,
    0x0ea50,
    0x06b58,
    0x055c0,
    0x0ab60,
    0x096d5,
    0x092e0,
    0x0c960,
    0x0d954,
    0x0d4a0,
    0x0da50,
    0x07552,
    0x056a0,
    0x0abb7,
    0x025d0,
    0x092d0,
    0x0cab5,
    0x0a950,
    0x0b4a0,
    0x0baa4,
    0x0ad50,
    0x055d9,
    0x04ba0,
    0x0a5b0,
    0x15176,
    0x052b0,
    0x0a930,
    0x07954,
    0x06aa0,
    0x0ad50,
    0x05b52,
    0x04b60,
    0x0a6e6,
    0x0a4e0,
    0x0d260,
    0x0ea65,
    0x0d530,
    0x05aa0,
    0x076a3,
    0x096d0,
    0x04afb,
    0x04ad0,
    0x0a4d0,
    0x1d0b6,
    0x0d250,
    0x0d520,
    0x0dd45,
    0x0b5a0,
    0x056d0,
    0x055b2,
    0x049b0,
    0x0a577,
    0x0a4b0,
    0x0aa50,
    0x1b255,
    0x06d20,
    0x0ada0,
    0x14b63,
    0x09370,
    0x049f8,
    0x04970,
    0x064b0,
    0x168a6,
    0x0ea50,
    0x06b20,
    0x1a6c4,
    0x0aae0,
    0x0a2e0,
    0x0d2e3,
    0x0c960,
    0x0d557,
    0x0d4a0,
    0x0da50,
    0x05d55,
    0x056a0,
    0x0a6d0,
    0x055d4,
    0x052d0,
    0x0a9b8,
    0x0a950,
    0x0b4a0,
    0x0b6a6,
    0x0ad50,
    0x055a0,
    0x0aba4,
    0x0a5b0,
    0x052b0,
    0x0b273,
    0x06930,
    0x07337,
    0x06aa0,
    0x0ad50,
    0x14b55,
    0x04b60,
    0x0a570,
    0x054e4,
    0x0d160,
    0x0e968,
    0x0d520,
    0x0daa0,
    0x16aa6,
    0x056d0,
    0x04ae0,
    0x0a9d4,
    0x0a2d0,
    0x0d150,
    0x0f252,
    0x0d520
}

-- 天干
local Gan = { "甲", "乙", "丙", "丁", "戊", "己", "庚", "辛", "壬", "癸" }

-- 地支
local Zhi = { "子", "丑", "寅", "卯", "辰", "巳", "午", "未", "申", "酉", "戌", "亥" }

-- 月份
local nStr3 = { "正", "二", "三", "四", "五", "六", "七", "八", "九", "十", "冬", "腊" }

-- 日期
local nStr2 = { "初", "十", "廿", "卅" }
local nStr1 = { "日", "一", "二", "三", "四", "五", "六", "七", "八", "九", "十" }

-- 实现位运算函数
local function band(a, b)
    if not a or not b then
    	return 0
    end

    -- Localize math.floor for performance
    local floor = math.floor
    local result = 0
    local bitval = 1

    -- 处理负数或0的情况
    if a <= 0 or b <= 0 then
    	return 0
    end

    while a > 0 and b > 0 do
        if a % 2 == 1 and b % 2 == 1 then
            result = result + bitval
        end

        bitval = bitval * 2
        a = floor(a/2)
        b = floor(b/2)
    end

    return result
end

local function rshift(a, b)
    if not a or not b then
    	return 0
    end

    if a <= 0 then
    	return 0
    end

    if b < 0 then
    	return a
    end

    return math.floor(a / (2^b))
end

-- 计算农历闰月月份
local function leapMonth(y)
    if y < 1900 or y > 2100 then
    	return 0
    end

	-- Lua table index starts from 1
    local index = y - 1900 + 1

	-- Lua table index starts from 1
    if index <= 0 or index > #lunarInfo then
    	return 0
    end

    return band(lunarInfo[index], 0xf)
end

-- 计算农历闰月天数
local function leapDays(y)
    if y < 1900 or y > 2100 then
    	return 0
    end

    local m = leapMonth(y)

    if m == 0 then
    	return 0
    end

	-- Lua table index starts from 1
    if band(lunarInfo[y - 1900 + 1], 0x10000) ~= 0 then
        return 30
    end

    return 29
end

-- 计算农历年天数
local function lYearDays(y)
    if y < 1900 or y > 2100 then
    	return 0
    end

    local sum = 348
    local i = 0x8000
	-- Lua table index starts from 1
    local idx = y - 1900 + 1

	-- Lua table index starts from 1
    if idx <= 0 or idx > #lunarInfo then
    	return 0
    end

    while i > 0x8 do
        if band(lunarInfo[idx], i) ~= 0 then
            sum = sum + 1
        end

        i = rshift(i, 1)
    end

    return sum + leapDays(y)
end

-- 计算农历月份天数
local function monthDays(y, m)
    if y < 1900 or y > 2100 then
    	return 0
    end

    if m > 12 or m < 1 then
    	return 0
    end

	-- Lua table index starts from 1
    if band(lunarInfo[y - 1900 + 1], rshift(0x10000, m)) ~= 0 then
        return 30
    end

    return 29
end

-- 主要的转换函数
function p.toLunar(frame)
    -- 解析输入日期
    local date = frame.args[1] or frame:getParent().args.date

    if not date then
    	return "日期参数错误"
    end

    local y, m, d = date:match("^(%d%d%d%d)-(%d%d?)-(%d%d?)$")

    if not y or not m or not d then
        return "日期格式错误"
    end

    y, m, d = tonumber(y), tonumber(m), tonumber(d)

    -- 验证日期范围
    if y < 1900 or y > 2100 then
        return "年份超出范围(1900-2100)"
    end

    if m < 1 or m > 12 then
        return "月份错误"
    end

    if d < 1 or d > 31 then
        return "日期错误"
    end

    -- 计算距离1900年1月31日的天数
    local baseDate = os.time({ year = 1900, month = 1, day = 31 })
    local targetDate = os.time({ year = y, month = m, day = d })
    local offset = math.floor((targetDate - baseDate) / (24 * 60 * 60))

    -- 计算农历年
    local ly = 1900
    local temp = 0

    while ly < 2101 and offset > 0 do
        temp = lYearDays(ly)
        offset = offset - temp
        ly = ly + 1
    end

    if offset < 0 then
        offset = offset + temp
        ly = ly - 1
    end

    -- 计算农历月日
    local lm = 1
    local ld = 1
    local isLeap = false
    local leap = leapMonth(ly)

    -- 计算月
    while offset > 0 and lm < 13 do
        if leap > 0 and lm == leap + 1 and not isLeap then
            lm = lm - 1
            isLeap = true
            temp = leapDays(ly)
        else
            temp = monthDays(ly, lm)
        end

        offset = offset - temp

        if isLeap and lm == leap + 1 then
        	isLeap = false
        end

        lm = lm + 1
    end

    -- 计算日
    if offset == 0 and leap > 0 and lm == leap + 1 then
        if isLeap then
            isLeap = false
        else
            isLeap = true
            lm = lm - 1
        end
    end

    if offset < 0 then
        offset = offset + temp
        lm = lm - 1
    end

    ld = offset + 1

    -- 格式化输出
    local gzYear = Gan[((ly - 4) % 10) + 1] .. Zhi[((ly - 4) % 12) + 1]
    local lMonth = nStr3[lm]
    local lDay

    if ld == 10 then
        lDay = "初十"
    elseif ld == 20 then
        lDay = "二十"
    elseif ld == 30 then
        lDay = "三十"
    else
        lDay = nStr2[math.floor(ld / 10) + 1] .. nStr1[ld % 10 + 1]
    end

    return gzYear .. "年" .. lMonth .. "月" .. lDay
end

return p