[antlr-interest] faster expression parsing

[John Ridgway]

You could steal an idea from ML :-) :
e : {options infix 60} e '*' e
    | {options infix 50} e '-' e
    | {options infix 50} e '+' e
    | {options infixr 66} e '::' e
  ...
or whatever.

Peace
- John


On Mar 19, 2008, at 10:28 AM, Terence Parr wrote:

>
> On Mar 19, 2008, at 7:30 AM, Edwards, Waverly wrote:
>
>>
>> If I understand correctly...
>> If you don't specify right associativity then its assumed to be left.
>> Order or precedence indicated by the depth of primary expressions
>> subrules.
>>
>>
>> That is an outstanding idea.
>
> thanks...pretty clean...
>
>>> e	:	e '*' e
>>> 	|	e '-' e
>>> 	|	e '+' e
>>> 	|	'-' e
>>> 	|	e '.' ID
>>> 	|	e '[' e ']'
>>> 	|	e '(' e (',' e)* ')'
>>> 	|	INT
>>> 	|	ID
>>> 	;
>
> I'll work on this...
> Ter