First appeared | 1985 |
---|---|
Stable release | |
OS | MS-DOS |
Website | www.grafxsoft.com/clipper.htm |
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Clipper is an xBasecompiler that implements a variant of the xBase computer programming language. It is used to create or extend software programs that originally operated primarily under MS-DOS. Although it is a powerful general-purpose programminglanguage, it was primarily used to create database/business programs.
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One major dBase feature not implemented in Clipper is the dot-prompt (. prompt) interactive command set,[1] which was an important part of the original dBase implementation.
Clipper, from Nantucket Corp and later Computer Associates, started out as a native code compiler for dBase III databases, and later evolved.[2]
History[edit]
Clipper was created by Nantucket Corporation, a company that was started in 1984 by Barry ReBell (management) and Brian Russell (technical); Larry Heimendinger was Nantucket's president.[3] In 1992, the company was sold to Computer Associates for 190 million dollars and the product was renamed to CA-Clipper.[4][5]
Clipper was created as a replacement programming language for Ashton Tate's dBASE III, a very popular database language at the time. The advantage of Clipper over dBASE was that it could be compiled[6] and executed under MS-DOS as a standalone application. In the years between 1985 and 1992, millions of Clipper applications were built, typically for small businesses dealing with databases concerning many aspects of client management and inventory management. For many smaller businesses, having a Clipper application designed to their specific needs was their first experience with software development. Also a lot of applications for banking and insurance companies were developed, here especially in those cases where the application was considered too small to be developed and run on traditional mainframes. In these environments Clipper also served as a front end for existing mainframe applications.[7]
As the product matured, it remained a DOS tool for many years, but added elements of the C programming language and Pascal programming language, as well as OOP, and the code-block. According to the article, Clipper had sold 2,000 copies in the Soviet Union[3] (compared to 250,000 worldwide).
Decline[edit]
Horizon modding tool for mac download. In the early 1990s, under new ownership[8], Clipper failed to transition from MS-DOS to Microsoft Windows. As a result, almost no new commercial applications were written in Clipper after 1995.
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By then, the 'classically trained programmer' commonly used strong typing, in contrast to the original dBASE language.An evolution of Clipper, named VO, added strong typing but made it optional, in order to remain compatibile with existing code.[8]Four of the more important languages that took over from Clipper were Visual Basic, Microsoft Access, Delphi, and Powerbuilder.They all provided strong typing.
Another factor in Clipper's decline was that, under Clipper 5.0, some applications crashed frequently and unpredictably. Nantucket didn't address the issue and seemed reluctant to even acknowledge it. Some developers moved to other products. The problem (a memory leak?) was later fixed by Computer Associates.[9]
Some existing Clipper applications remained in active use for ten or fifteen years, requiring regular maintenance.Around 2015, the number of Clipper applications that still saw daily commercial use was very small.
Revival by third-parties[edit]
The Clipper language is being actively implemented and extended[10] by multiple organizations/vendors, like XBase++ from Alaska Software and FlagShip, as well as free (GPL-licensed) projects like Harbour and xHarbour.[11]
Many of the current implementations are portable (DOS, Windows, Linux (32- and 64-bit), Unix (32- and 64-bit), and macOS), supporting many language extensions,[12] and have greatly extended runtime libraries, as well as various Replaceable Database Drivers (RDD) supporting many popular database formats, like DBF, DBTNTX, DBFCDX (FoxPro, Apollo, Comix, and Advantage Database Server), MachSix (SIx Driver and Apollo), SQL, and more. These newer implementations all strive for full compatibility with the standard dBase/xBase syntax, while also offering OOP approaches and target-based syntax such as
SQLExecute()
.Usenet[edit]
The Clipper Usenetnewsgroups are comp.lang.clipper and comp.lang.clipper.visual-objects.
Compiling and running hello world program in clipper
Programming in Clipper[edit]
A simple hello world - application:
A simple data base input mask:
Version history[edit]
The various versions of Clipper were
From Nantucket Corporation; the 'seasonal versions', billed as 'dBasecompilers'
- Nantucket Clipper Winter'84 - released May 25, 1985
- Nantucket Clipper Summer'85 - released 1985
- Nantucket Clipper Winter'85 - released January 29, 1986
- Nantucket Clipper Autumn'86 - released October 31, 1986
- Nantucket Clipper Summer'87 - released December 21, 1987
From Nantucket Corporation; Clipper 5
- Nantucket Clipper 5.00 - released 1990
- Nantucket Clipper 5.01 - released April 15, 1991
- Nantucket Clipper 5.01 Rev.129 - released March 31, 1992
and from Computer Associates; CA-Clipper 5
- CA Clipper 5.01a -
- CA Clipper 5.20 - released February 15, 1993
- CA-Clipper 5.2a - released March 15, 1993
- CA Clipper 5.2b - released June 25, 1993
- CA-Clipper 5.2c - released August 6, 1993
- CA Clipper 5.2d - released March 25, 1994
- CA-Clipper 5.2e - released February 7, 1995
- CA Clipper 5.30 - released June 26, 1995
- CA Clipper 5.3a - released May 20, 1996
- CA Clipper 5.3b - released May 20, 1997
Clipper tools[edit]
In addition to the standard clipper library, a library named 'Clipper Tools' was developed by CA after purchasing Nantucket. Three versions of this library were released, alongside Clipper versions. This library became a de facto standard amongst Clipper clones, such as xHarbour. It was also cloned by several of Clipper's clones.
References[edit]
- ^Warren M. Littlefield (1983). DBASE - From the Dot Prompt: An Introduction to Structured Programming using dBase IV. ISBN0791417808.
- ^'Clipper'.
a native code compiler for dBase .later evolved .
- ^ abGlenn Rifkin. 'Selling Software, Soviet-Style'. The New York Times.
- ^'CA-Clipper | Viva Clipper !'.
- ^GrafX Software licensed CA-Clipper in 2002 from CA for ongoing marketing and distribution.
- ^Compiling dBASE code changes it from interpreted code, which must be interpreted every time each line of code is executed, to p-code, which uses a Virtual Machine to process the compiled p-code. p-code is considerably faster, but still not as fast as the machine code generated by native compilers. As a technical marketing ploy, the p-code was wrapped into object code (linkable .obj files) which gave the impression that it was compiled to native code.
- ^'Clipper'. thocp.net. The History Of Computing Project. 20 June 2007.
- ^ abcRod da Silva (October 1, 1995). 'Examining CA-Visual Objects'. Dr. Dobb's Journal.
- ^(No data for reference - I was active in the Clipper community and this was what I witnessed at the Clipper conferences.)
- ^2014: 'Changes'. Angus Johnson.
v6.2.0 (26 September 2014) . release of the Clipper library.. The PolyNode Class has a new IsOpen property (to support open paths).. The Clipper class has a new ZFillFunction property.
- ^'Converting Clipper applications to windows'. January 31, 2006.
- ^'xHarbour.org'. www.xharbour.org.
External links[edit]
- Print from Clipper to newest Windows printers article
- The Oasis is the largest file archive for CA-Clipper and xBase on the web
- Harbour Project A 32/64 bit multiplatform Clipper compiler
Retrieved from 'https://en.wikipedia.org/w/index.php?title=Clipper_(programming_language)&oldid=977284134'
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