RSI - Dynamic Overbought/Oversold Range

// This source code is subject to the terms of the Mozilla Public License 2.0 at https://mozilla.org/MPL/2.0/
// © HeWhoMustNotBeNamed

//   __    __            __       __  __                  __       __                        __      __    __              __      _______             __    __                                          __
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//  $$ |  $$ |  ______  $$ | / \ $$ |$$ |____    ______  $$  \   /$$ | __    __   _______  _$$ |_   $$  \ $$ |  ______   _$$ |_   $$$$$$$  |  ______  $$  \ $$ |  ______   _____  ____    ______    ____$$ |
//  $$ |__$$ | /      \ $$ |/$  \$$ |$$      \  /      \ $$$  \ /$$$ |/  |  /  | /       |/ $$   |  $$$  \$$ | /      \ / $$   |  $$ |__$$ | /      \ $$$  \$$ | /      \ /     \/    \  /      \  /    $$ |
//  $$    $$ |/$$$$$$  |$$ /$$$  $$ |$$$$$$$  |/$$$$$$  |$$$$  /$$$$ |$$ |  $$ |/$$$$$$$/ $$$$$$/   $$$$  $$ |/$$$$$$  |$$$$$$/   $$    $$< /$$$$$$  |$$$$  $$ | $$$$$$  |$$$$$$ $$$$  |/$$$$$$  |/$$$$$$$ |
//  $$$$$$$$ |$$    $$ |$$ $$/$$ $$ |$$ |  $$ |$$ |  $$ |$$ $$ $$/$$ |$$ |  $$ |$$      \   $$ | __ $$ $$ $$ |$$ |  $$ |  $$ | __ $$$$$$$  |$$    $$ |$$ $$ $$ | /    $$ |$$ | $$ | $$ |$$    $$ |$$ |  $$ |
//  $$ |  $$ |$$$$$$$$/ $$$$/  $$$$ |$$ |  $$ |$$ \__$$ |$$ |$$$/ $$ |$$ \__$$ | $$$$$$  |  $$ |/  |$$ |$$$$ |$$ \__$$ |  $$ |/  |$$ |__$$ |$$$$$$$$/ $$ |$$$$ |/$$$$$$$ |$$ | $$ | $$ |$$$$$$$$/ $$ \__$$ |
//  $$ |  $$ |$$       |$$$/    $$$ |$$ |  $$ |$$    $$/ $$ | $/  $$ |$$    $$/ /     $$/   $$  $$/ $$ | $$$ |$$    $$/   $$  $$/ $$    $$/ $$       |$$ | $$$ |$$    $$ |$$ | $$ | $$ |$$       |$$    $$ |
//  $$/   $$/  $$$$$$$/ $$/      $$/ $$/   $$/  $$$$$$/  $$/      $$/  $$$$$$/  $$$$$$$/     $$$$/  $$/   $$/  $$$$$$/     $$$$/  $$$$$$$/   $$$$$$$/ $$/   $$/  $$$$$$$/ $$/  $$/  $$/  $$$$$$$/  $$$$$$$/
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//@version=4
study("RSI - Dynamic Overbought/Oversold Range", shorttitle="RSI-DR")
resolution = input("", type=input.resolution, title="Resolution", group="RSI")
source = input(close, title="Source", group="RSI")
length = input(14, title="Length", group="RSI")
repaint = input(true, title="Repaint", group="RSI")
method = input("swma", title="Detection Method", group = "Overbought/Oversold Range", options=["highlow", "sma", "ema", "rma", "hma", "wma", "vwma", "swma"])
rangeLength = input(50, step=10, title="Length", group="Overbought/Oversold Range")

f_security(_sym, _res, _src, _rep) => security(_sym, _res, _src[not _rep and barstate.isrealtime ? 1 : 0])[_rep or barstate.isrealtime ? 0 : 1]

f_get_ma(source, method, rangeLength)=>
    method == "sma" ? sma(source,rangeLength) :
         method == "ema" ? ema(source,rangeLength) :
         method == "rma" ? rma(source,rangeLength) :
         method == "hma" ? hma(source,rangeLength) :
         method == "wma" ? wma(source,rangeLength) :
         method == "vwma" ? vwma(source,rangeLength) :
         method == "swma" ? swma(source) :
         method == "high"? highest(source, rangeLength) :
         method == "low" ? lowest(source, rangeLength) : na

f_rsi_high(source, length, method, rangeLength)=> f_get_ma(highest(rsi(source, length), rangeLength), method == "highlow" ? "low" : method, length)

f_rsi_low(source, length, method, rangeLength)=> f_get_ma(lowest(rsi(source, length), rangeLength), method == "highlow" ? "high" : method, length)

rsi = f_security(syminfo.tickerid, resolution, rsi(source, length), repaint)
rsiHigh = f_security(syminfo.tickerid, resolution, f_rsi_high(source, length, method, rangeLength), repaint)
rsiLow = f_security(syminfo.tickerid, resolution, f_rsi_low(source, length, method, rangeLength), repaint)

highSma = sma(highest(rsi, rangeLength), length)
lowSma = sma(lowest(rsi, rangeLength), length)
plot(rsi, title="RSI", color=color.blue)
plot(rsiHigh, title="Overbought", color=color.red)
plot(rsiLow, title="Oversold", color=color.green)