如何使用下面列出的tos中的代码在tradingview中创建堆叠的EMAs警报？我想不出怎么把它转换成pinescript

//@version=4
study(title="Stacked EMAs Alert", shorttitle="Stacked EMAs Alert", overlay=true)

// 输入参数
length1 = input(9, title="EMA 1 Length")
length2 = input(21, title="EMA 2 Length")
length3 = input(50, title="EMA 3 Length")
length4 = input(100, title="EMA 4 Length")

// 计算指数移动平均线
ema1 = ema(close, length1)
ema2 = ema(close, length2)
ema3 = ema(close, length3)
ema4 = ema(close, length4)

// 绘制指数移动平均线
plot(ema1, color=color.blue, title="EMA 1")
plot(ema2, color=color.green, title="EMA 2")
plot(ema3, color=color.orange, title="EMA 3")
plot(ema4, color=color.red, title="EMA 4")

// 创建堆叠的EMAs警报条件
ema1_cross_ema2 = crossover(ema1, ema2)
ema2_cross_ema3 = crossover(ema2, ema3)
ema3_cross_ema4 = crossover(ema3, ema4)

// 发出警报
alertcondition(ema1_cross_ema2 and ema2_cross_ema3 and ema3_cross_ema4, title="Stacked EMAs Alert", message="EMAs are stacked")

// 说明
plotshape(ema1_cross_ema2 and ema2_cross_ema3 and ema3_cross_ema4, title="Alert", location=location.belowbar, color=color.red, style=shape.labeltext, text="EMAs Stacked")