10 lines
256 B
Plaintext
10 lines
256 B
Plaintext
%parser 42.lexer // for Program 4.2
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%left PLUS MINUS
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%left TIMES
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%before MINUS
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exp : INT:i { $$=i; }
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| exp:e1 PLUS exp:e2 { $$ = e1+e2; }
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| exp:e1 MINUS exp:e2 { $$ = e1-e2; }
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| exp:e1 TIMES exp:e2 { $$ = e1*e2; }
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| MINUS exp:e { $$ = -e; };
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