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Subject: camlp4: how do you write this rule?
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From: Joel Reymont <joelr1@gmail.com>
Date: Wed, 11 Mar 2009 23:21:17 +0000
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X-Spam: no; 0.00; camlp:01 camlp:01 expr:01 expr:01 instr:01 expression:02 parse:02 div:97 lefta:02 mul:04 opt:04 bottom:93 rule:10 rule:10 doesn't:12 

I would like my expression rule to parse "1 + 2 points" as "Plus (1,  
Points 2)".

I currently have the following, with Points right-associative and at  
the bottom, but it doesn't work. Is this something that Camlp4 can  
handle?

	Thanks, Joel

expr:
   [ ...
   | LEFTA
     [ e1 = expr; "Or"; e2 = expr -> Or (e1, e2)
     | e1 = expr; "And"; e2 = expr -> And (e1, e2)
     | e1 = expr; "Mod"; e2 = expr -> Mod (e1, e2)
     | e1 = expr; "*"; e2 = expr -> Mul (e1, e2)
     | e1 = expr; "/"; e2 = expr -> Div (e1, e2)
     | "Not"; e = expr -> Not e
     ]
   | RIGHTA
     [ e = expr; [ "Points"; "Point" ]; i = OPT instr -> Points (e, i) ]
   ];

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