This ProBuilder code snippet is designed to identify a specific candlestick pattern in trading charts. The pattern consists of a doji candlestick flanked by two larger candlesticks that are similar in size. The code allows users to set parameters for the doji size and the minimum size and similarity of the surrounding candlesticks.

DojiPercent = 50 //percentage
CandleBodySize = 10 //points
Maxdifference = 20 //percentage

// --- 
doji=(abs(open - close) <= (high - low) * (Dojipercent/100))
body = abs(open-close)
bodysize = body>=candlebodysize*pointsize

if bodysize and (max(body,body[2])-min(body,body[2]))/body[2]<=maxdifference/100 and doji[1] then
    //drawarrow(barindex[1],low[1])
    //backgroundcolor(150,150,150,50)
    drawrectangle(barindex[2],highest[3](high),barindex,lowest[3](low))
endif

return

Explanation of the Code:

• Parameter Definitions: The parameters DojiPercent, CandleBodySize, and Maxdifference are set to define the characteristics of the doji and the surrounding candles. DojiPercent determines the maximum body size of the doji as a percentage of its total range. CandleBodySize sets the minimum size of the bodies of the surrounding candles in points. Maxdifference allows a percentage difference in the body sizes of the surrounding candles.
• Doji Calculation: The variable doji is calculated by comparing the absolute difference between the open and close prices to a fraction of the total range (high - low) of the candle. This determines if the current candle is a doji based on the defined DojiPercent.
• Body Size Check: The body variable calculates the absolute difference between the open and close prices of the candle. The bodysize boolean checks if the body size of the candle is at least as large as the defined CandleBodySize.
• Conditional Drawing: If the current and the candle two periods before have a minimum body size and their sizes are within the Maxdifference percentage, and the previous candle is a doji, then a rectangle is drawn from the highest high to the lowest low over the last three bars. This visually highlights the pattern on the chart.

This code is useful for traders and analysts who use technical analysis to identify potential reversals or continuations in price trends based on candlestick patterns.