?? parser.cup
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// JavaCup specification for a simple expression evaluator (w/ actions)package java_cup.simple_calc;import java_cup.runtime.*;/* Terminals (tokens returned by the scanner). */terminal SEMI, PLUS, MINUS, TIMES, DIVIDE, MOD;terminal UMINUS, LPAREN, RPAREN;terminal Integer NUMBER;/* Non terminals */non terminal Object expr_list, expr_part;non terminal Integer expr;/* Precedences */precedence left PLUS, MINUS;precedence left TIMES, DIVIDE, MOD;precedence left UMINUS, LPAREN;/* The grammar */expr_list ::= expr_list expr_part | expr_part;expr_part ::= expr:e {: System.out.println("= " + e); :} SEMI ;expr ::= expr:e1 PLUS expr:e2 {: RESULT = new Integer(e1.intValue() + e2.intValue()); :} | expr:e1 MINUS expr:e2 {: RESULT = new Integer(e1.intValue() - e2.intValue()); :} | expr:e1 TIMES expr:e2 {: RESULT = new Integer(e1.intValue() * e2.intValue()); :} | expr:e1 DIVIDE expr:e2 {: RESULT = new Integer(e1.intValue() / e2.intValue()); :} | expr:e1 MOD expr:e2 {: RESULT = new Integer(e1.intValue() % e2.intValue()); :} | NUMBER:n {: RESULT = n; :} | MINUS expr:e {: RESULT = new Integer(0 - e.intValue()); :} %prec UMINUS | LPAREN expr:e RPAREN {: RESULT = e; :} ;?? 快捷鍵說明
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