ALGOL 68RS: Difference between revisions
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{{wikipedia}}{{implementation|ALGOL 68}} |
{{wikipedia}}{{implementation|ALGOL 68}} |
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ALGOL 68RS from [ |
ALGOL 68RS from [[wp: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 [[wp:wiki_ICL_2900_Series|ICL 2900]]/[[wp:ICL_Series_39|Series 39]], [[Multics]] and [[wp:VAX|DEC VAX/VMS]]. |
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The language was based on the Revised Report, but with similar subset restrictions to [[ALGOL 68R]]. |
The language was based on the Revised Report, but with similar subset restrictions to [[ALGOL 68R]]. |
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Syntax: |
Syntax: |
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<pre> |
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[ CONTEXT holename IN progtitle ] |
[ CONTEXT holename IN progtitle ] |
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[ USE uselist ] |
[ USE uselist ] |
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enclosed clause |
enclosed clause |
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FINISH |
FINISH</lang> |
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</pre> |
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<pre> |
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CONTEXT holename IN progtitle |
CONTEXT holename IN progtitle |
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[ USE uselist ] |
[ USE uselist ] |
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decsbody |
decsbody |
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KEEP keeplist |
KEEP keeplist |
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FINISH |
FINISH</lang> |
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</pre> |
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=== Example === |
=== Example === |
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<pre> |
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BEGIN |
BEGIN |
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MODE PIECE = STRUCT(...); |
MODE PIECE = STRUCT(...); |
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HERE displaying(PIECE, pieces, BOARD, game); |
HERE displaying(PIECE, pieces, BOARD, game); |
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... |
... |
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END |
END</lang> |
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</pre> |
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<pre> |
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CONTEXT thinking IN chess |
CONTEXT thinking IN chess |
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... |
... |
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FINISH |
FINISH</lang> |
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</pre> |
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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. |
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. |
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Example: |
Example: |
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<pre> |
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COMPOSE game(thinking=thinkmodule, displaying=displayingmodule(piece=displaypiece)) |
COMPOSE game(thinking=thinkmodule, displaying=displayingmodule(piece=displaypiece)) |
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FINISH |
FINISH</lang> |
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</pre> |
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