TADS

History

However, Graham Nelson's Inform has, since its release in 1993, slowly gained popularity and superseded TADS in the last half of the 90s.
Nevertheless, TADS 2 has been maintained and updated at regular intervals by its creator, Michael J. Roberts, even after it became freeware in July 1996.

Multimedia TADS, introduced in 1998, allows games to display graphics, animation and play sounds, if the platform supports it.

Recently, TADS received a major overhaul with the release of TADS 3, which is a complete rewrite of the TADS engine, only retaining the platform-dependent code to ease porting.
TADS 3 has many new features, such as efficient dynamic objects (with automatic garbage collection), structured exceptions, native UTF-8 strings, and many useful function classes.

According to the official TADS website, as of November 2004, the TADS 3 system is in its beta release[1]. While TADS 3 is still subject to last-minute changes, and while its documentation is incomplete, the TADS 3 compiler and interpreter are stable and they have been ported to the Unix, Macintosh and MS-DOS platforms. It should be noted that several TADS 3 games have been entered into the 2002, 2003, and 2004 IF Competition.

TADS games

Whereas the TADS 1 and 2 VMs had to parse the commands entered by the player, before sending the results on to the game, TADS 3 employs a more general-purpose virtual machine, where the command-parsing is done by the game code itself, akin to Inform. The rationale for this is that it is easier to customize the parser.

The programming language

A Hello world program isn't that simple to write in TADS 2, because TADS 2 requires a working world model to compile.

#include #include   replace commonInit: function {"Hello World!\ "; quit; }   startroom: room; // We must define a startroom object. Of course, the goal of TADS 2 is to make Interactive Fiction (and not Hello World programs) simple to implement, and in pursuing that goal it succeeds.

Nevertheless, TADS 3 dispenses with the requirement of a working world model, and also abandons the Pascal elements of the language.

function main(args)
{"Hello World!";
}
Further reading
 Interactive fiction in general.
 Inform is another interactive fiction design system that is comparable to TADS in terms of power, flexibility, portability, and popularity. Another well-regarded system is Hugo, though it is not nearly as widely-used as either TADS or Inform.
External links
 The TADS page
 The official TADS web site
 TADS 2 and TADS 3 games on Baf's Guide
 TADS 2 interpreters for several platforms
 Jetty - Java Applet Interpreter for TADS 2 games
 TADS 3 interpreters for DOS, Windows, and source for Unix
 HyperTADS, a Mac OS multimedia interpreter for TADS 2 and 3
 "Cloak of Darkness" in TADS (A sample game coded in several languages, to demonstrate the coding of each)
 The TADS 3 mailing list