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ALGOL 68RS: Difference between revisions

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ALGOL 68RS (view source)

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{{wikipedia}}{{implementation|ALGOL 68}}
ALGOL 68RS from [http[wp://en.wikipedia.org/wiki/Royal_Signals_and_Radar_Establishment |RSRE]] was a portable compiler system written in ALGOL 68RS (bootstrapped from [[ALGOL 68R]]), and implemented on a variety of systems including the [http[wp://en.wikipedia.org/wiki_ICL_2900_Series |ICL 2900]]/[http[wp://en.wikipedia.org/wiki/ICL_Series_39 |Series 39]], [[Multics]] and [http[wp://en.wikipedia.org/wikiVAXVAX|DEC VAX/VMS]].
 
The language was based on the Revised Report, but with similar subset restrictions to [[ALGOL 68R]].
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Syntax:
<lang algol68>PROGRAM [ (holelist ) ] progtitle▼
<pre>
▲PROGRAM [ (holelist ) ] progtitle
[ CONTEXT holename IN progtitle ]
[ USE uselist ]
enclosed clause
FINISH</lang>
<lang algol68>DECS dectitle▼
</pre>
<pre>
▲DECS dectitle
CONTEXT holename IN progtitle
[ USE uselist ]
decsbody
KEEP keeplist
FINISH</lang>
</pre>
 
=== Example ===
<lang algol68>PROGRAM (thinking, displaying) chess▼
<pre>
▲PROGRAM (thinking, displaying) chess
BEGIN
MODE PIECE = STRUCT(...);
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HERE displaying(PIECE, pieces, BOARD, game);
...
END</lang>
</pre>
 
<lang algol68>PROGRAM thinkmodule▼
<pre>
▲PROGRAM thinkmodule
CONTEXT thinking IN chess
...
FINISH</lang>
</pre>
 
An entire program can thus be '''composed''' of pieces of other modules, particularly if a ''hole'' contains a sub-''hole'' (eg displaypiece), then this ''hole'' can in-turn be pulled into the composition.
 
Example:
<lang algol68>PROGRAM abc▼
<pre>
▲PROGRAM abc
COMPOSE game(thinking=thinkmodule, displaying=displayingmodule(piece=displaypiece))
FINISH</lang>
</pre>
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