You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: redactor.go
    path of file: ./repos/unipdf/redactor
    
    the code of the file until where you have to start completion: //
// Copyright 2020 FoxyUtils ehf. All rights reserved.
//
// This is a commercial product and requires a license to operate.
// A trial license can be obtained at https://unidoc.io
//
// DO NOT EDIT: generated by unitwist Go source code obfuscator.
//
// Use of this source code is governed by the UniDoc End User License Agreement
// terms that can be accessed at https://unidoc.io/eula/

package redactor ;import (_fa "errors";_f "fmt";_e "github.com/unidoc/unipdf/v3/common";_dd "github.com/unidoc/unipdf/v3/contentstream";_cb "github.com/unidoc/unipdf/v3/core";_d "github.com/unidoc/unipdf/v3/creator";_aa "github.com/unidoc/unipdf/v3/extractor";
_bb "github.com/unidoc/unipdf/v3/model";_fb "io";_a "regexp";_b "sort";_g "strings";);

// Redact executes the redact operation on a pdf file and updates the content streams of all pages of the file.
func (_gba *Redactor )Redact ()error {_bdbf ,_gaddf :=_gba ._bag .GetNumPages ();if _gaddf !
    
func RedactRectanglePropsNew ()*RectangleProps {return &RectangleProps {FillColor :_d .ColorBlack ,BorderWidth :0.0,FillOpacity :1.0};};func _feaf (_fgd ,_eedf string )[]int {if len (_eedf )==0{return nil ;};var _gbc []int ;for _bffc :=0;_bffc < len (_fgd );
{_fdb :=_g .Index (_fgd [_bffc :],_eedf );if _fdb < 0{return _gbc ;};_gbc =append (_gbc ,_bffc +_fdb );_bffc +=_fdb +len (_eedf );};return _gbc ;};type localSpanMarks struct{_gefe *_aa .TextMarkArray ;_abd int ;_eec string ;};func (_aagd *regexMatcher )match (_fca string )([]*matchedIndex ,error ){_ccb :=_aagd ._afg .Pattern ;
if _ccb ==nil {return nil ,_fa .New ("\u006e\u006f\u0020\u0070at\u0074\u0065\u0072\u006e\u0020\u0063\u006f\u006d\u0070\u0069\u006c\u0065\u0064");};var (_fbfc =_ccb .FindAllStringIndex (_fca ,-1);_bafg []*matchedIndex ;);for _ ,_edgg :=range _fbfc {_bafg =append (_bafg ,&matchedIndex {_ccff :_edgg [0],_aaga :_edgg [1],_adbbf :_fca [_edgg [0]:_edgg [1]]});
};return _bafg ,nil ;};func _acga (_cbe string ,_gcd *_bb .PdfFont )[]byte {_eege ,_bfa :=_gcd .StringToCharcodeBytes (_cbe );if _bfa !=0{_e .Log .Debug ("\u0057\u0041\u0052\u004e\u003a\u0020\u0073\u006fm\u0065\u0020\u0072un\u0065\u0073\u0020\u0063\u006f\u0075l\u0064\u0020\u006e\u006f\u0074\u0020\u0062\u0065\u0020\u0065\u006e\u0063\u006f\u0064\u0065d\u002e\u000a\u0009\u0025\u0073\u0020\u002d\u003e \u0025\u0076",_cbe ,_eege );
};return _eege ;};func _aad (_bbf _cb .PdfObject ,_dbaa *_bb .PdfFont )(string ,error ){_adde ,_bbd :=_cb .GetStringBytes (_bbf );if !_bbd {return "",_cb .ErrTypeError ;};_adbd :=_dbaa .BytesToCharcodes (_adde );_cdbg ,_dage ,_aff :=_dbaa .CharcodesToStrings (_adbd );
if _aff > 0{_e .Log .Debug ("\u0072\u0065nd\u0065\u0072\u0054e\u0078\u0074\u003a\u0020num\u0043ha\u0072\u0073\u003d\u0025\u0064\u0020\u006eum\u004d\u0069\u0073\u0073\u0065\u0073\u003d%\u0064",_dage ,_aff );};_dgc :=_g .Join (_cdbg ,"");return _dgc ,nil ;
};func _cfed (_cfec ,_ede ,_bdd float64 )float64 {_bdd =_bdd /100;_gga :=(-1000*_cfec )/(_ede *_bdd );return _gga ;};func _gaeg (_cff *_dd .ContentStreamOperations ,PdfObj _cb .PdfObject )(*_dd .ContentStreamOperation ,int ,bool ){for _agda ,_bdgb :=range *_cff {_febb :=_bdgb .Operand ;
if _febb =="\u0054\u006a"{_cadb :=_cb .TraceToDirectObject (_bdgb .Params [0]);if _cadb ==PdfObj {return _bdgb ,_agda ,true ;};}else if _febb =="\u0054\u004a"{_deac ,_geg :=_cb .GetArray (_bdgb .Params [0]);if !_geg {return nil ,_agda ,_geg ;};for _ ,_cefeg :=range _deac .Elements (){if _cefeg ==PdfObj {return _bdgb ,_agda ,true ;
};};}else if _febb =="\u0022"{_abb :=_cb .TraceToDirectObject (_bdgb .Params [2]);if _abb ==PdfObj {return _bdgb ,_agda ,true ;};}else if _febb =="\u0027"{_bca :=_cb .TraceToDirectObject (_bdgb .Params [0]);if _bca ==PdfObj {return _bdgb ,_agda ,true ;
};};};return nil ,-1,false ;};func _cgg (_ccce string )(string ,[][]int ){_gcec :=_a .MustCompile ("\u005c\u006e");_bffd :=_gcec .FindAllStringIndex (_ccce ,-1);_cadea :=_gcec .ReplaceAllString (_ccce ,"\u0020");return _cadea ,_bffd ;};func _gdg (_fgb *matchedIndex ,_cbf [][]int )[]*matchedIndex {_fbaf :=[]*matchedIndex {};
_gebda :=_fgb ._ccff ;_ceef :=_gebda ;_cea :=_fgb ._adbbf ;_dabg :=0;for _ ,_gcc :=range _cbf {_eage :=_gcc [0]-_gebda ;if _dabg >=_eage {continue ;};_gegd :=_cea [_dabg :_eage ];_bef :=&matchedIndex {_adbbf :_gegd ,_ccff :_ceef ,_aaga :_gcc [0]};if len (_g .TrimSpace (_gegd ))!=0{_fbaf =append (_fbaf ,_bef );
};_dabg =_gcc [1]-_gebda ;_ceef =_gebda +_dabg ;};_bdce :=_cea [_dabg :];_dff :=&matchedIndex {_adbbf :_bdce ,_ccff :_ceef ,_aaga :_fgb ._aaga };if len (_g .TrimSpace (_bdce ))!=0{_fbaf =append (_fbaf ,_dff );};return _fbaf ;};type targetMap struct{_edgd string ;
_fbcf [][]int ;};