Hammer automatic finding script

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//  Copyright by HPotter v1.0 10/04/2014
//    This is a bullish reversal candlestick which occurs in a downtrend. 
//    It has a small real body at the top of the candlestick and a long lower shadow.  
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study(title = "Hammer", overlay = true)
upper = highest(10)[1]
barcolor(high < min(open[1], close[1]) ?  abs(open - close) * 3 < min(open, close) - low ? (high - max(open,close)) < 0.05 * (abs(open - close)) ? yellow :na  : na : na)