snobol4op - SNOBOL4 operators
All SNOBOL4 operators can be redefined with OPSYN(). These are the
default assignments.
The following operator character sequences are permitted and
represent a cross between PDP-10 Macro SNOBOL4, SITBOL and Catspaw SPITBOL
usage:
List of Binary Operators, in decreasing order of precedence. When operators of
equal precedence are adjacent, associativity determines order of evaluation.
SPITBOL and BLOCKS extensions control operator definitions are
orthogonal and can be controlled separately.
Char Defn. Assoc. Enabled
= _ assignment RIGHT w/ SPITBOL
? pattern match LEFT w/ SPITBOL
& definable LEFT
| alternation LEFT
# normal concat LEFT w/ BLOCKS
% vertical concat LEFT w/ BLOCKS
sp concatenation LEFT
@ definable LEFT
- + subtract, add LEFT
# definable LEFT w/o BLOCKS
* multiplication LEFT
% definable LEFT w/o BLOCKS
? definable LEFT w/o SPITBOL
/ division LEFT
^ ** exponentiation RIGHT
$ . match naming LEFT
~ definable RIGHT
Char Defn.
\ negation
? interrogation
$ indirect reference
. none
! none
% none
* unevaluated expression
/ none
# none
+ positive
- negative
@ cursor position assignment
| none
& keyword