ShaderInterpreter.Converter.MakeStructFieldsPublic C# (CSharp) Method

        private static string MakeStructFieldsPublic( string _Source )
        {
            int	CurrentPosition = 0;
            while ( true )
            {
                int	StructIndex = _Source.IndexOf( "struct", CurrentPosition, StringComparison.InvariantCultureIgnoreCase );
                if ( StructIndex == -1 )
                    break;

                int	StructBeginIndex = _Source.IndexOf( "{", StructIndex, StringComparison.InvariantCultureIgnoreCase );
                if ( StructBeginIndex == -1 )
                    throw new ConverterException( "Failed to retrieve opening { for struct!", _Source, StructIndex );

                int	StructEndIndex = _Source.IndexOf( "}", StructBeginIndex, StringComparison.InvariantCultureIgnoreCase );
                if ( StructEndIndex == -1 )
                    throw new ConverterException( "Failed to retrieve closing } for struct!", _Source, StructIndex );

                CurrentPosition = FindEOL( _Source, StructBeginIndex );
                if ( CurrentPosition == -1 )
                    throw new ConverterException( "Failed to retrieve end of line after struct { !", _Source, StructIndex );
                CurrentPosition++;	// Start at new line

                while ( CurrentPosition < StructEndIndex )
                {
                    int	EOLIndex = FindEOL( _Source, CurrentPosition );

                    // Retrieve and check for valid field
                    int		FieldIndex = CurrentPosition;
                    string	Field = _Source.Substring( FieldIndex, EOLIndex - FieldIndex );
                    Field = Field.Trim();

                    int		SemicolonIndex = Field.IndexOf( ";" );
                    SemicolonIndex = SemicolonIndex == -1 ? Field.Length : SemicolonIndex;
                    bool	IsCommented = IsCommentedLine( Field, SemicolonIndex );	// The line is commented if we find a // before any ; terminator

                    if ( Field == "" || IsCommented )
                    {	// This line is either empty or is a comment...
                        CurrentPosition = EOLIndex+1;
                        continue;
                    }

                    // Insert the public keyword at the beginning of this field declaration
                    _Source = _Source.Insert( CurrentPosition, "public " );

                    // Go to next line...
                    CurrentPosition = FindEOL( _Source, CurrentPosition );
                    if ( CurrentPosition == -1 )
                        throw new ConverterException( "Failed to retrieve end of line after struct field \"" + Field + "\"!", _Source, FieldIndex, EOLIndex );

                    CurrentPosition++;	// Start at new line

                    // Update position of end of structure
                    StructEndIndex = _Source.IndexOf( "}", StructBeginIndex, StringComparison.InvariantCultureIgnoreCase );
                }
            }

            return _Source;
        }