Antlr4.StringTemplate.Compiler.TemplateLexer.MatchString C# (CSharp) Метод

        private IToken MatchString()
        {
            //{setText(getText().substring(1, getText().length()-1));}
            bool sawEscape = false;
            StringBuilder buf = new StringBuilder();
            buf.Append(c);
            Consume();
            while (c != '"')
            {
                if (c == '\\')
                {
                    sawEscape = true;
                    Consume();
                    switch (c)
                    {
                    case 'n':
                        buf.Append('\n');
                        break;

                    case 'r':
                        buf.Append('\r');
                        break;

                    case 't':
                        buf.Append('\t');
                        break;

                    default:
                        buf.Append(c);
                        break;
                    }

                    Consume();
                    continue;
                }

                buf.Append(c);
                Consume();
                if (c == EOF)
                {
                    RecognitionException re = new MismatchedTokenException((int)'"', input);
                    re.Line = input.Line;
                    re.CharPositionInLine = input.CharPositionInLine;
                    errMgr.LexerError(input.SourceName, "EOF in string", templateToken, re);
                    break;
                }
            }

            buf.Append(c);
            Consume();

            if (sawEscape)
                return NewToken(STRING, buf.ToString());
            else
                return NewToken(STRING);
        }