ALGOL 68 Genie: Difference between revisions
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The author of Algol 68 Genie is Marcel van der Veer. Algol68G is released under the GNU GPL and runs on [[Linux]], [[UNIX]], [[BSD]] [[Mac OS X|Mac OS]] and [[Windows]] XP, and is available [http://www.xs4all.nl/~jmvdveer/algol.html here].
[[ALGOL 68G]] is an interpretor that runs on Linux and a good way to get started with [[ALGOL 68]]. ''ALGOL 68G'' mk14.1 is now available for download for Fedora9 from Source Forge - [http://sourceforge.net/project/showfiles.php?group_id=114223&package_id=300114&release_id=642308 Download now]. (This download RPM includes a 400 page [[ALGOL 68]] manual in printer
==Features of Algol68G==
* The [[interpreter]] performs checks on many events, for example: assigning to <
* Precision of numeric modes: implementation of <
* On systems that support them, UNIX extensions that allow e.g. for executing child processes that communicate through pipes, matching regular expressions or fetching web page contents.
* Procedures for drawing using the GNU Plotting Utilities.
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== Extensions to Algol 68 ==
* Implementation of C.H. Lindsey's partial parametrisation proposal, which allows for [[currying]] in Algol 68, giving it a functional sublanguage.
* A simple refinement preprocessor to facilitate top-down program construction.
* Implementation of pseudo-operators <
* Implementation of a post-checked loop. A do-part may enclose a serial clause followed by an optional until-part, or just enclose an until-part. This is an alternative to the paradigm Algol 68 post-check loop <
* Implementation of <
== Deviations from the Revised Report language ==
The important deviations are:
* The important difference with the Revised Report transput model is that Algol68G transput does not operate on <
* The Algol68G parallel clause deviates from the Algol 68 parallel clause when parallel clauses are nested. In Algol68G, stack frames inside a parallel unit are private, therefore if parallel units modify a shared variable then this variable must be declared outside the outermost parallel clause, and a jump out of a parallel unit can only be targeted at a label outside the outermost parallel clause.
* The interpreter does not implement so-called ghost-elements {RR 2.1.3.4}, hence it cannot check bounds when assigning to rows of mode flexible-rows-of-rows-of-... when the destination has a flat descriptor.
* Algol68G does not recognise nonlocal environs {RR 5.2.3.2}. All environs are local.
* Transputting a file is essentially sequential. Only <
* When all arguments in a call of <
==
Note that to use large arrays, the amount of memory available for the interpreter can be set via the "heap" command line parameter or via a "heap" pragmatic comment.
<pre>
E.g.: via the command line:
a68g -heap=512M someProgram.a68
E.g.: Using a pragmatic comment in the actual Algol 68 source:
PR heap=512M PR
</pre>
==Download==
* [http://www.xs4all.nl/~jmvdveer/algol.html Algol 68 Genie web page]
* [http://sourceforge.net/projects/algol68/ Fedora/Centos/RHEL/Win32: Sourceforge Algol 68 Compiler, Interpreter & Runtime]
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