Lingo (programming language)
Lingo is a scripting language developed by John H. Thompson for use in Adobe Director (formerly Macromedia Director), used for regular desktop applications, interactive kiosks, CD-ROMs and Adobe Shockwave internet sites. HyperTalk is likely to have been one of the inspirations for Lingo.
When Lingo was created, a verbose syntax was designed to mimic spoken language, so it would be easy for beginners to get started. You could write whole HyperTalk-like sentences such as:
if sprite 5 is visible then go to the frame
Note that in "go to" statements the "to" is optional. Also note that unlike other programming languages, "go" statements reference frames in Director's Score, not particular lines of code.
Lingo was also initially very robust by providing object generation through a notion called
factory, which led to the language's extensibility through External Factories (XFactories) or XObjects. For Director 3.13 and later versions extensibility was accomplished using a different type of plug-in called an XTRA based upon the Microsoft Component Object Model (COM).
The equivalent in new scripting style would be:
if sprite(5).visible then _movie.go(_movie.frame)
This format uses elements of the Director Object Model, introduced in Director MX 2004. The syntax in prior versions would be like:
if sprite(5).visible then go the frame
Lingo is embedded into Adobe Director. Lingo is an object-oriented programming (OOP) language.
There are 4 types of scripts in Lingo:
- Cast script a script works only with its member not all the events can be used with it
- behavior scripts are attached to a sprite or inserted into a frame. Sprite behaviors are often used to give control of the sprite's properties and movement. Frame behaviors can be used to create a pause or delay within a certain frame in the score. Behaviors make it easy to program in an object-oriented way, as you can directly see the relationship between the programming and the item they are attached to. They can also control or interact with other sprites, making them a true object.
- movie scripts are not attached to sprites nor can they be instantiated as Objects. They are available throughout the program (movie) and are especially useful for holding global handlers and initializing global variables at the start or end of the movie.
- parent scripts are used to "birth" (create instances of) an Object into a Variable using the "new" command. These objects can control sprites and other media remotely, without being attached to any one sprite, may be used to control data or other non-displayed items, and are useful for recursion routines such as pathfinding. A Parent script can be used to create or destroy an object at anytime, freeing them from the confines of the score that a Behavior is limited to.
Behavior and parent scripts encourage good object-oriented programming. Movie scripts are not as OOP-oriented; however, they can still be used to make "black-box" handlers, where other objects can input raw data and receive answers back, without knowing the inner workings of the box. Using the strengths and ease-of-use of Director's programming methodology, with the advantages of OOP makes for a powerful and fast programming environment.
Lingo supports object inheritance by a slightly idiosyncratic system: a script can have an
ancestor property which references another object (usually also a script, although other objects such as cast members can also be ancestors). Properties and methods of the ancestor are inherited by the parent. Behavior scripts are also a kind of ancestor of the sprites to which they are attached, since properties and methods of the behavior can be accessed by reference to the sprite itself. In this case, we have a kind of multiple inheritance, as one sprite may have several behaviors.
Lingo 3.0 was also extensibile through External Factories (XFactories) or XObjects (later replaced by Lingo Xtras), which provided programmatic extensions to Director. For example, controlling external media devices such as CD-ROM and Video tape players through Macintosh SerialPort. XObject API was openly available to developers and media device producers, which added to the popularity and versatility of Lingo. Macromind was very active in positioning the XObject API as standard for external media devices to collaborate through Lingo; and its interest as a standard achieved a lot of involvement from prominent and burgeoning media product companies through an ad hoc group called the Multimedia Association.
Beginning with Director version 4.0, Lingo was extensibile through a new improved class of external plugin called XTRAs). These were written in C++ using the Microsoft Component Object Model (COM). The standardization with COM helped attract developers to creating a market for such plug-ins, and a page on the Macromedia Web Site listed various types and sources of XTRA plug-ins.
A very powerful part of the language is Imaging Lingo. It was introduced when Director version 8.0 arrived. It gives the user the power of image manipulation with simple commands. There are some similarities to functions of image applications (like Photoshop), that make it easy to create dynamic, code-based visual effects. Since then imaging has also been added to Adobe Flash's ActionScript language with the Flash BitmapData object. As this included more sophisticated commands, Director was also updated to allow conversion between the BitmapData object and its own Image objects.
In Director 8.5, a full 3D engine was included for the first time. Lingo was updated substantially to support the new 3D objects and now includes a well-featured (if by now slightly out of date) set of 3D commands. An Xtra was also created to enable use of the Havok 3D Physics engine. Director 11 introduced a new physics Xtra using the Ageia physics engine.
Other languages called Lingo
- A language called Lingo was released for software development under Windows. This version was designed as a compilable high level programming language.
- A programming language based on Smalltalk was developed for the Rekursiv processor developed by Linn Smart Computing in Scotland, UK. This language was called Lingo and is significant because the manufacturers successfully obtained a trade mark in the UK.
- LINGO is also a programming language for solving linear, nonlinear and integer optimization problems, first developed in 1988 by LINDO Systems Inc. This language is still in production.
These other languages are perhaps not as well known as the Macromedia language. However, a legal anomaly remains in that the legal trademark of the word 'Lingo' in the UK is not held by Macromedia, but by Linn.
Lingo was quickly adopted by burgeoning multimedia community and the already popular Micromind Director product. Initially, about 90% of the users only used 10% of Lingo's features; primarily
go to the frame by multimedia authors of tutorials and presentations. However, 10% of the users were game developers who took a wider interest in the other 90% of the functionality, including their own functional extensions by creating their own XFactories/XObjects. The Journeyman Project is a prominent example of this.
Jeff Tanner (programmer), a former Macromind employee who worked for John Thompson in developing and testing initial Lingo for Macromedia Director 2.2 and 3.0, created custom XObjects for various media device producers, language extension examples using XFactory including the XFactory API, and wrote the initial tutorials on how to use Lingo. Worked with Marc Canter, founder of Macromedia in writing white papers to promote XObject API to Multimedia Association, an ad hoc group of media device providers working together to provide extensibility to Lingo.
Dave Shields (Quality Assurance), another former Macromind employee who worked with John Thompson, tested and documented Object-based Lingo for Macromedia Director 3.13 and 4.0. He ran build scripts to create weekly releases for testing, originated the Macromedia KnowledgeBase, created examples of how to write Lingo XTRA plug-ins in C++, and assembled the "Golden Master" disks of Macromedia Director that were shipped to the duplicator. Later he became a multimedia consultant who helped clients integrate Director into their projects, and sold a line of XTRA plug-ins on the 1990s World-Wide Web.
- Adobe - Director Support Center : Lingo - Lingo Language Support Center at Adobe.com