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<syntaxhighlight lang="algol68"># -*- coding: utf-8 -*- #
COMMENT▼
This is an ALGOL 68 prelude file called prelude/general.▼
It contains small routine that are not part of any standard, ▼
but are none the less useful and widely used.▼
USAGE▼
PR READ "prelude/general.a68" PR▼
END COMMENT▼
##########################################▼
# Define some general routines and MODES #▼
##########################################▼
MODE SIMPLEOUT = [0]UNION(INT, CHAR, STRING, []STRING);▼
PRIO MIN=8, MAX=8;
OP MIN = (INT a,b)INT: (a<b|a|b),
MAX = (INT a,b)INT: (a>b|a|b);
PROC raise exception = (STRING type, SIMPLEOUT argv)VOID:(▼
OP MIN = (REAL a,b)REAL: (a<b|a|b),
BOOL exception = FALSE;▼
MAX = (REAL a,b)REAL: (a>b|a|b);
putf(stand error, ($g$, "Exception"," ",type, ": ", argv, $l$));▼
ASSERT (exception)▼
MODE IUR = UNION(INT, REAL);
);▼
OP R = (IUR x)REAL: (x|(REAL r):r, (INT i):REAL(i));
PROC raise undefined = (SIMPLEOUT argv)VOID:▼
MODE IURUC = UNION(INT, REAL, COMPL);
raise exception("Undefined", argv);▼
OP C = (IURUC x)COMPL: (x|(COMPL c): c, (REAL r):COMPL(r), (INT i):COMPL(i));
PROC raise value error = (SIMPLEOUT argv)VOID:▼
raise exception("Value Error",argv);▼
OP S = (CUCCUS x)STRING: (x|(STRING s):s, ([]CHAR cc): STRING(cc), (CHAR c):STRING(c));
MODE
UCHAR = STRING, LONGCHAR = UCHAR, USTRING=FLEX[0]LONGCHAR,
LBITS = UNION(SHORT SHORT BITS, SHORT BITS, BITS, LONG BITS, LONG LONG BITS),
LBYTES = UNION(SHORT SHORT BYTES, SHORT BYTES, BYTES, LONG BYTES, LONG LONG BYTES),
LINT = UNION(SHORT SHORT INT, SHORT INT, INT, LONG INT, LONG LONG INT),
LREAL = UNION(SHORT SHORT REAL, SHORT REAL, REAL, LONG REAL, LONG LONG REAL),
LCOMPL = UNION(SHORT SHORT COMPL, SHORT COMPL, COMPL, LONG COMPL, LONG LONG COMPL);
MODE SIMPLEOUT = [0]UNION(BOOL, CHAR, STRING, USTRING, LBITS, # LBYTES,# LINT, LREAL, LCOMPL);
MODE SIMPLEOUTF = [0]UNION(FORMAT, SIMPLEOUT);
MODE USIMPLEOUT = SIMPLEOUT # UNION(SIMPLEOUT, SIMPLEOUTF) #;
PRIO REPR = 8;
# Use MOID with "*:=" OPerators who's where the returned MODE is often VOIDed for convenience #
MODE MOID = VOID;
#CASE argv IN#
# (SIMPLEOUSTRING argv):putf(stand error, argv),#
putf(stand error, ($g" "$, argv))
#ESAC#;
putf(stand error, $l$);
# Python style exceptions #
▲PROC raise undefined = (USIMPLEOUT argv)VOID: raise exception("Undefined", argv);
PROC raise unimplemented=(USIMPLEOUT argv)VOID: raise exception("Unimplemented", argv);
PROC raise type error = (USIMPLEOUT argv)VOID: raise exception("Type Error",argv);
BOOL debug := FALSE, trace := FALSE;
PRIO INKEYS = 5, INVALUES = 5, NOTINKEYS = 5, NOTINVALUES = 5;
# Algol68G specific declarations #
INT match=0, no match=1, out of memory error=2, other error=3; # for RegEx searches #</syntaxhighlight>
<noinclude>{{template}}</noinclude>
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