Template:Prelude/general.a68
<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 #
PRIO MIN=8, MAX=8; OP MIN = (INT a,b)INT: (a<b|a|b),
MAX = (INT a,b)INT: (a>b|a|b);
OP MIN = (REAL a,b)REAL: (a<b|a|b),
MAX = (REAL a,b)REAL: (a>b|a|b);
MODE IUR = UNION(INT, REAL); OP R = (IUR x)REAL: (x|(REAL r):r, (INT i):REAL(i));
MODE IURUC = UNION(INT, REAL, COMPL); OP C = (IURUC x)COMPL: (x|(COMPL c): c, (REAL r):COMPL(r), (INT i):COMPL(i));
MODE CUCCUS = UNION(CHAR, #[]CHAR,# STRING); 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;
PROC raise exception = (STRING type, USIMPLEOUT argv)VOID:(
BOOL exception = FALSE;
putf(stand error, ($g$, "Exception"," ",type, ": "));
#CASE argv IN#
# (SIMPLEOUSTRING argv):putf(stand error, argv),#
# (SIMPLEOUT argv):#
putf(stand error, ($g" "$, argv))
#ESAC#;
putf(stand error, $l$);
ASSERT (exception)
);
- 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 value error = (USIMPLEOUT argv)VOID: raise exception("Value Error",argv); PROC raise index error = (USIMPLEOUT argv)VOID: raise exception("Index Error",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 #</lang>