Convert pinescript from trading view to mt4 with some editing

the base of the code is for the 3 line break chart 

https://www.mql5.com/en/articles/902

https://www.mql5.com/en/market/product/3123

here is the code 

//@version=4

study("Swing High/Low", overlay=true)

tri = input(true, "Plot Triangles")

li = input(false, "Plot High/Lows")

la = input(false, "Plot Price Crossing")

// vars

var lasth = 0.0

var lastl = 0.0

// up

if open < close and open[1] > close[1]

    lastl := low[1]

// down

if open > close and open[1] < close[1]

    lasth := high[1]

// plot

plot(li == true ? lastl : na, color=color.lime, editable=false, style=plot.style_stepline)

plot(li == true ? lasth : na, color=color.red, editable=false, style=plot.style_stepline)

up = lastl == lastl[1] ? na : true and tri == true

dn = lasth == lasth[1] ? na : true and tri == true

plotshape(up, title="Low", style=shape.triangleup, color=color.lime, location=location.belowbar, offset=-1, editable=false)

plotshape(dn, title="High", style=shape.triangledown, color=color.red, location=location.abovebar, offset=-1, editable=false)

crossup = high > lasth and high[1] < lasth[1]

crossdown = low < lastl and low[1] > lastl[1]

plotshape(la == true ? crossup : na, title="Cross", style=shape.cross, color=color.blue, location=location.belowbar, offset=0, editable=false)

plotshape(la == true ? crossdown : na, title="Cross", style=shape.cross, color=color.blue, location=location.abovebar, offset=0, editable=false)

//alerts

alertcondition(crossdown or crossup, "Both", "Price crossed previous High/Low")

alertcondition(crossdown, "Under Low", "Price went below previous low")

alertcondition(crossup, "Over High", "Price went above previous high")

***** but the issue is i want alerts when the current price passes the high low not when the bar closes