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 .
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.
1 ; 2 , 4 -> := <- = => >> 6 << 7 ===> 8 |- 9 <==> 10 ==> 11 or 12 and 13 not 14 != < <= =!= == === > >= ? 15 || 16 : 17 | 18 ^^ 19 & 20 .. 21 + ++ - 22 ** 24 % * / // \ \\ 25 @ 26 (*) SPACE 27 @@ 28 ~ 29 # #? . .? ^ ^** _ 30 ! |