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I need to convert a pine script indicator to MQL4. The name of the pine script indicator is BBWP (Bollinger Band Width Percentage)
The pine script is between the comments below
/////Start of Pine Script////////////
//
// @version=5
//
// This source code is subject to the terms of the Mozilla Public License 2.0 at https://mozilla.org/MPL/2.0/
// @author = The_Caretaker
// © The_Caretaker
//
// Much respect to John A Bollinger the creator of Bollinger Bands® and Bollinger Band Width indicators.
//
// Feel free to reuse or develop this script further, please drop me a note below if you find it useful.
//
indicator ( 'Bollinger Band Width Percentile', 'BBWP', overlay = false, format = format.percent, precision = 2, max_bars_back = 1000 )
///////////////////////////////////////////////////////////////////////////////
// Variable declarations
var string s_HMMML = 'High - Mid Hi - Mid - Mid Low - Low'
var string s_HML = 'High - Mid - Low'
var string s_HL = 'High - Low'
///////////////////////////////////////////////////////////////////////////////
// inputs
i_priceSrc = input.source ( close, 'Price Source', group = 'BBWP Properties')
i_basisType = input.string ( 'SMA', 'Basis Type', options=[ 'SMA', 'EMA', 'WMA', 'RMA', 'HMA', 'VWMA' ], group = 'BBWP Properties')
i_bbwpLen = input.int ( 13, 'Length', minval=1, group = 'BBWP Properties')
i_bbwpLkbk = input.int ( 252, 'Lookback', minval=1, group = 'BBWP Properties')
i_c_typ_line = input.string ( 'Spectrum', 'Color Type', options=[ 'Spectrum', 'Solid' ], inline = '1', group = 'Line Plot Settings')
i_c_so_line = input.color ( #FFFF00, 'Solid Color', inline = '1', group = 'Line Plot Settings')
i_c_typ_sp_line = input.string ( s_HMMML, 'Spectrum', options=[ s_HL, s_HML, s_HMMML ], inline = '2', group = 'Line Plot Settings')
i_c_sp_hi_line = input.color ( #FF0000, 'High', inline = '3', group = 'Line Plot Settings')
i_c_sp_mhi_line = input.color ( #ffff00, 'Mid Hi', inline = '3', group = 'Line Plot Settings')
i_c_sp_mid_line = input.color ( #00FF00, 'Mid', inline = '3', group = 'Line Plot Settings')
i_c_sp_mlo_line = input.color ( #00ffff, 'Mid Lo', inline = '3', group = 'Line Plot Settings')
i_c_sp_lo_line = input.color ( #0000FF, 'Low', inline = '3', group = 'Line Plot Settings')
i_p_width_line = input.int ( 2, 'Line Width', minval=1, maxval=4, inline = '4', group = 'Line Plot Settings')
i_ma1On = input.bool ( true, '', inline = '1', group = 'Moving Average Settings')
i_ma1Type = input.string ( 'SMA', 'MA 1 Type', options=[ 'SMA', 'EMA', 'WMA', 'RMA', 'HMA' ], inline = '1', group = 'Moving Average Settings')
i_c_ma1 = input.color ( #FFFFFF, '', inline = '1', group = 'Moving Average Settings')
i_ma1Len = input.int ( 5, 'Length', minval=1, inline = '1', group = 'Moving Average Settings')
i_ma2On = input.bool ( false, '', inline = '2', group = 'Moving Average Settings')
i_ma2Type = input.string ( 'SMA', 'MA 2 Type', options=[ 'SMA', 'EMA', 'WMA', 'RMA', 'HMA' ], inline = '2', group = 'Moving Average Settings')
i_c_ma2 = input.color ( #00FFFF, '', inline = '2', group = 'Moving Average Settings')
i_ma2Len = input.int ( 8, 'Length', minval=1, inline = '2', group = 'Moving Average Settings')
i_alrtsOn = input.bool ( true, 'Alerts On', group = 'Visual Alerts')
i_upperLevel = input.int ( 98, 'Extreme High', minval=1, inline='1', group = 'Visual Alerts')
i_lowerLevel = input.int ( 2, 'Extreme Low', minval=1, inline='1', group = 'Visual Alerts')
///////////////////////////////////////////////////////////////////////////////
// function declarations
f_maType ( _price, _len, _type ) =>
switch _type
"SMA" => ta.sma ( _price, _len )
"EMA" => ta.ema ( _price, _len )
"WMA" => ta.wma ( _price, _len )
"RMA" => ta.rma ( _price, _len )
"HMA" => ta.hma ( _price, _len )
=> ta.vwma ( _price, _len )
// Returns moving average determined by _type
f_bbwp ( _price, _bbwLen, _bbwpLen, _type ) =>
float _basis = f_maType ( _price, _bbwLen, _type )
float _dev = ta.stdev ( _price, _bbwLen )
_bbw = ( _basis + _dev - ( _basis - _dev )) / _basis
_bbwSum = 0.0
_len = bar_index < _bbwpLen ? bar_index : _bbwpLen
for _i = 1 to _len by 1
_bbwSum += ( _bbw[_i] > _bbw ? 0 : 1 )
_bbwSum
_return = bar_index >= _bbwLen ? ( _bbwSum / _len) * 100 : na
_return
// Returns Bollinger Band Width Percentile
f_5Col ( _val, _lowV, _lmV, _midV, _hmV, _hiV, _lowC, _lmC, _midC, _mhC, _hiC ) =>
_val <= _lmV ? color.from_gradient ( _val, _lowV, _lmV, _lowC, _lmC ) : _val <= _midV ? color.from_gradient ( _val, _lmV, _midV, _lmC, _midC ) : _val <= _hmV ? color.from_gradient ( _val, _midV, _hmV, _midC, _mhC ) : color.from_gradient ( _val, _hmV, _hiV, _mhC, _hiC )
// Returns a quatruple spectrum color determined by _val from high to mid high to mid to mid low to low
f_3Col ( _val, _lowV, _midV, _hiV, _lowC, _midC, _hiC ) =>
_val <= _midV ? color.from_gradient ( _val, _lowV, _midV, _lowC, _midC) : color.from_gradient ( _val, _midV, _hiV, _midC, _hiC)
// Returns a double spectrum color determined by _val from high to mid to low
f_clrSlct ( _val, _type, _solid, _grad, _lowV, _lmV, _midV, _hmV, _hiV, _lowC, _lmC, _midC, _mhC, _hiC ) =>
_type == 'Solid' ? _solid : _grad == s_HL ? color.from_gradient ( _val, _lowV, _hiV, _lowC, _hiC) : _grad == s_HML ? f_3Col ( _val, _lowV, _midV, _hiV, _lowC, _midC, _hiC ) : f_5Col ( _val, _lowV, _lmV, _midV, _hmV, _hiV, _lowC, _lmC, _midC, _mhC, _hiC )
// Returns a color determined by _val from user settings of solid, or spectrum from high to low, or double spectrum from high to mid to low, or quatruple spectrum from high to mid high to mid to mid low to low
///////////////////////////////////////////////////////////////////////////////
// calculations
bbwp = f_bbwp ( i_priceSrc, i_bbwpLen, i_bbwpLkbk, i_basisType )
c_bbwp = f_clrSlct ( bbwp, i_c_typ_line, i_c_so_line, i_c_typ_sp_line, 0, 25, 50, 75, 100, i_c_sp_lo_line, i_c_sp_mlo_line, i_c_sp_mid_line, i_c_sp_mhi_line, i_c_sp_hi_line )
bbwpMA1 = i_ma1On ? f_maType ( bbwp, i_ma1Len, i_ma1Type ) : na
bbwpMA2 = i_ma2On ? f_maType ( bbwp, i_ma2Len, i_ma2Type ) : na
hiAlrtBar = i_alrtsOn and bbwp >= i_upperLevel ? bbwp : na
loAlrtBar = i_alrtsOn and bbwp <= i_lowerLevel ? bbwp : na
///////////////////////////////////////////////////////////////////////////////
// plots
p_scaleHi = hline ( 100, 'Scale High',#ff0000, hline.style_solid )
p_midLine = hline ( 50, 'Mid-Line', #a6a6a6, hline.style_dashed )
p_scaleLo = hline ( 0, 'Scale Low', #0000ff, hline.style_solid )
p_bbwp = plot ( bbwp, 'BBWP', c_bbwp, i_p_width_line, plot.style_line, editable=false )
p_hiAlrt = plot ( hiAlrtBar, 'Extreme Hi', c_bbwp, 1, plot.style_columns, histbase=0, editable=false )
p_loAlrt = plot ( loAlrtBar, 'Extreme Lo', c_bbwp, 1, plot.style_columns, histbase=100, editable=false )
p_ma1 = plot ( bbwpMA1, 'MA 1', i_c_ma1, 1, plot.style_line, 0 )
p_ma2 = plot ( bbwpMA2, 'MA 2', i_c_ma2, 1, plot.style_line, 0 )
/////////////////////////////
// end
//////End of Pine Script///////////
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