Rutgers ALGOL 68: Difference between revisions
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=== Rutgers University Algol 68 Interpreter - runs under WIndows, Linux and DOS ===
Not all the exotic features are implemented. In particular there are no semaphores, formats and parallel-clauses.▼
<br>▼
Long and short modes are not implemented and will cause errors to be reported, if used. ▼
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The stadard prelude has a number of ommissions, particularly transput which is restricted to standard input and output only.▼
<br>▼
<br>
<br>
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* Tar ball => http://www.renyi.hu/~csirmaz/algol-68
* Laci Csirmaz, DIMACS at Rutgers, 1990; CEU, Hungary, 2000
<br><br>
▲Not all the exotic features are implemented. In particular there are no semaphores, formats and parallel-clauses.
<br><br>
The manual included with the interpreter details the restrictons, some of those that would affect some of the RC samples are listed here and in the Transput section.
<br><br>
▲
▲<br>
▲The stadard prelude has a number of ommissions, particularly transput
▲<br>
There are no pragmats (using '''pr''' or '''pragma''' will cause an error message to be issued) and hence no file inclusion.
=== Lexical style ===
Rutgers ALGOL 68 is case-sensitive and uses quote-stropping. The standard bold-words are in lower case, e.g.:
<
print( ( "Hello, World!", newline ) )
'end'</
=== Transput ===
The restrictions Rutgers Algol68 places on the language and prelude are described in the manual. The following highlights some of the differences that are likely to affect running the RC samples with Rutgers Algol 68.<br>
▲<br>
Only the standard input and standard ouptut channels are supported. The transput event routines (on logical file end etc.) are not implemented. Formatted transput is not implemented.
<br><br>
There are a number of differences in the formatting of items output by print/write.
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The read procedure handles '''char''' and '''string''' items differently to the standard.<br>
read( ( c ) ), where c is a '''char''' item gets the next character from standard input - c is set to '''repr''' 10 at end of line.
<br>
read( ( s ) ), where s is a '''string''' item does not change the bounds of s, it reads as many characters as are currently contained in s, - so '''string''' s; read( ( s, newline ) ) won't read anything into s as its bounds will be 1:0 at that point.
=== Building and running under Windows ===
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Place the following batch file into the the folder and execute it. The batch file asumes TCC is being used as the C compiler, change as appropriate. The DEFINES and ALINC variables may also need to be changed.
<
rem set CC and DEFINES as appropriate for your C compiler
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cd ..
cd ..</
Note that the interpreter requires <sys/times.h>, the TCC compiler used in the batch file above did not have one, the following dummy times.h can be used. If needed it should be placed in a sub-folder of the installation folder, called '''sys'''.
<syntaxhighlight lang=C>// times.h for RutgersAlgol68 - not a real timss.h
#include <time.h>
#define times(x) (unsigned) time(x)
// end RutgersAlgol68 times.h</syntaxhighlight>
The following batch file can be used to execute the interpreter with an upper-stropping source (as used by most of the samples on RC):
<
@
@set p=%1
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@ %rBin%\dump.exe _.d68
@ exit /b 7
@:endR68</
The prelude.r68, postlude.r68 and upperToQuote.r68 soureces used by the above batch-file should be placed in the installation folder (\algolRutgersAlgol8 is assumed here). They are in the following sections on Using upper-stropping and Additional prelude items.▼
▲The '''prelude.r68''', '''postlude.r68''' and '''upperToQuote.r68''' soureces used by the above batch-file should be placed in the installation folder (\algolRutgersAlgol8 is assumed here). They are in the following sections on Using upper-stropping and Additional prelude items.
=== Using upper stropping ===
As mentioned above, Rutgers Algol 68 uses quote-stropping. The following program will convert an upper-stropping source to Rutgers style quote-stropping.
<br><br>
This should be placed in the installation folder (\algol\RutgersAlgol68 is assumed here) and called '''upperToQuote.r68'''.
<
'proc' control = ( 'char' letter )'char': 'repr' ( 1 + ( 'abs' letter - 'abs' "A" ) );
'char' ctrlE = control( "E" );
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'fi'
'od'
'end'</
Note that Rutgers Algol 68 does not implement transput event routines, so cannot detect EOF. The above program assumes EOF will be indicated by control-E followed by control-O followed by control-F.
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The following source should be placed in the instalation folder (\algol\RutgersAlgol68 is assumed here) and named '''prelude.r68''':
<
'int' max abs char = 255;
'mode' 'complex' = 'compl';
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found
'end'; # char in string #
'begin'</
The following source should be placed in the installaton folder (\algol\RutgersAlgol68 is assumed here) and named '''postlude.r68'''.
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'''Note''' that ^E^O^F should be replaced with the seuence of characters control-E, control-O and control-F.
<
'end'
^E^O^F</
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