One aspect of parsing precedence is associativity. A left-associative operator is one, such as *, with the property that x * y * z is parsed as (x * y) * z. A right-associative operator is one, such as =, with the property that x = y = z is parsed as x = (y = z). These operators are left associative: # #? % & * ** + ++ , - . .. ..< .? / // << @@ ^ ^** ^^ _ | ||, and these operators are right associative: != -> : := ; < <- <= <== <=== <==> = =!= == === ===> ==> => > >= >> ? @ \ \\ |- and or SPACE xor .
Here are the operators arranged in order of increasing parsing precedence. For example, * has higher parsing precedence than +, and hence 2+3*5 is parsed as though it had been written as 2+(3*5). The symbol SPACE represents the operator that is used when two things are adjacent in program code.
8 ;
10 ,
14 -> := <- = => >>
18 <<
20 |-
22 <=== ===>
24 <==>
26 <== ==>
28 or
30 xor
32 and
34 not
36 != < <= =!= == === > >= ?
38 ||
40 :
42 |
44 ^^
46 &
48 .. ..<
50 + ++ -
52 **
56 % * / // \ \\
58 @
60 SPACE
62 (*)
64 @@
66 ^* _* ~
68 # #? . .? ^ ^** _
70 !
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