Plenty of great apps have been created using the Mac’s scripting languages, but commercial developers have largely relied on compiled languages used and supported by Apple for app and system development. Over the years those have included Object Pascal, C/C++, Objective-C and most recently Swift. This article provides a brief overview of how those changed.
Lisa Clascal (1984-86)
Following Apple’s use of UCSD Pascal on Apple II computers, when the Lisa was being developed its primary language was Lisa Pascal. Apple was also working on the novel object-oriented language Smalltalk which originated in Xerox’s PARC in 1969, but its syntax was unfamiliar and performance was poor. Lisa Pascal was therefore developed into Clascal, dividing code into distinct interface and implementation sections, with classes, subclasses, methods and inheritance.
During the first couple of years, software for the Mac was thus developed using Clascal on Lisa systems.
Object Pascal (1986-91)
In 1984-85, Larry Tesler and supporting engineers in Apple (including Barry Haynes, Ken Doyle and Larry Rosenstein) worked with Niklaus Wirth, the inventor of Pascal, to develop Clascal into Object Pascal, the primary language for Mac development. With this, they also developed the first version of the MacApp class library that provided a framework to support common application features including the Mac’s GUI.
These were released together in September 1986, in Macintosh Programmer’s Workshop (MPW), which was adopted as the standard development environment for the Mac, both in-house and for third-parties. At that time, the only compiled language supported by MPW was Object Pascal, and it wasn’t until the following summer that the first beta of its C/C++ compiler was released with MPW 2.0. That was developed by Greenhills, but Object Pascal remained the more widely used, particularly in combination with MacApp, also written in Object Pascal. Major developers including Adobe created early versions of their products using Object Pascal and MacApp, perhaps the most famous example being Adobe Photoshop.
At the same time, Think Technologies released the first popular third-party compiler, LightSpeed C, in 1986. This soon became THINK C, gained C++ support, was joined by THINK Pascal, and was bought by Symantec. Borland ported its Turbo Pascal to the Mac, where it adopted the extensions of Object Pascal, and eventually became the cross-platform Delphi in 1995.
C/C++ (1991-2001)
With the release of System 7 in 1991, Apple abruptly switched from Object Pascal to C++, and MacApp 3.0 also changed language. Smaller developers who had extensive source in Object Pascal were far from happy, and in some cases successful products vanished from the market. Others were rescued when Metrowerks released a new integrated development environment for C/C++ as CodeWarrior at the end of 1993 or early 1994. This drew most who had been using THINK C, and MPW also went into decline. The decisive factor was CodeWarrior’s early support for Apple’s new PowerPC Macs. CodeWarrior’s C/C++ saw many Mac developers through that hardware transition until the release of Mac OS X in 2000-01.
... continue reading