idTech4.Text.idLexer.ReadEscapeCharacter C# (CSharp) Method

		private bool ReadEscapeCharacter(out char escapeCharacter)
		{
			char c;
			int i, val;

			// step over the leading '\\'
			_scriptPosition++;

			// determine the escape character
			switch(GetBufferCharacter(_scriptPosition))
			{
				case '\\': c = '\\'; break;
				case 'n': c = '\n'; break;
				case 'r': c = '\r'; break;
				case 't': c = '\t'; break;
				case 'v': c = '\v'; break;
				case 'b': c = '\b'; break;
				case 'f': c = '\f'; break;
				case 'a': c = '\a'; break;
				case '\'': c = '\''; break;
				case '\"': c = '\"'; break;
				//case '\?': c = '\?'; break;
				case 'x':
					{
						_scriptPosition++;

						for(i = 0, val = 0; ; i++, _scriptPosition++)
						{
							c = GetBufferCharacter(_scriptPosition);

							if((c >= '0') && (c <= '9'))
							{
								c = (char) (c - '0');
							}
							else if((c >= 'A') && (c <= 'Z'))
							{
								c = (char) (c - 'A' + 10);
							}
							else if((c >= 'a') && (c <= 'z'))
							{
								c = (char) (c - 'a' + 10);
							}
							else
							{
								break;
							}

							val = (val << 4) + c;
						}

						_scriptPosition--;

						if(val > 0xFF)
						{
							Warning("too large value in escape character");
							val = 0xFF;
						}

						c = (char) val;
						break;
					}
				default: //NOTE: decimal ASCII code, NOT octal
					{
						if((GetBufferCharacter(_scriptPosition) < '0') || (GetBufferCharacter(_scriptPosition) > '9'))
						{
							Error("unknown escape char");
						}

						for(i = 0, val = 0; ; i++, _scriptPosition++)
						{
							c = GetBufferCharacter(_scriptPosition);

							if((c >= '0') && (c <= '9'))
							{
								c = (char) (c - '0');
							}
							else
							{
								break;
							}

							val = val * 10 + c;
						}

						_scriptPosition--;

						if(val > 0xFF)
						{
							Warning("too large value in escape character");
							val = 0xFF;
						}

						c = (char) val;
						break;
					}
			}

			// step over the escape character or the last digit of the number
			_scriptPosition++;

			// store the escape character
			escapeCharacter = c;

			// succesfully read escape character
			return true;
		}