1 tree grammar PolyDifferentiator; 2 options { 3 tokenVocab=Poly; 4 language=ObjC; 5 ASTLabelType=CommonTree; 6 output=AST; 7 // rewrite=true; // works either in rewrite or normal mode 8 } 9 10 poly: ^('+' poly poly) 11 | ^(MULT INT ID) -> INT 12 | ^(MULT c=INT ^('^' ID e=INT)) 13 { 14 NSString *c2 = [NSString stringWithFormat:@"\%d", $c.int*$e.int]; 15 NSString *e2 = [NSString stringWithFormat:@"\%d", $e.int-1]; 16 } 17 -> ^(MULT[@"*"] INT[c2] ^('^' ID INT[e2])) 18 | ^('^' ID e=INT) 19 { 20 NSString *c2 = [NSString stringWithFormat:@"\%d", $e.int]; 21 NSString *e2 = [NSString stringWithFormat:@"\%d", $e.int-1]; 22 } 23 -> ^(MULT[@"*"] INT[c2] ^('^' ID INT[e2])) 24 | INT -> INT[@"0"] 25 | ID -> INT[@"1"] 26 ; 27
