Binary


1   package polyglot.ast;
2   
3   import polyglot.util.Enum;
4   
5   /**
6    * A <code>Binary</code> represents a Java binary expression, an
7    * immutable pair of expressions combined with an operator.
8    */
9   public interface Binary extends Expr
10  {
11      /** Binary expression operator. */
12      public static class Operator extends Enum   {
13      Precedence prec;
14  
15          public Operator(String   name, Precedence prec) {
16          super(name);
17          this.prec = prec;
18      }
19  
20      /** Returns the precedence of the operator. */
21      public Precedence precedence() { return prec; }
22      }
23  
24      public static final Operator GT       = new Operator(">", Precedence.RELATIONAL);
25      public static final Operator LT       = new Operator("<", Precedence.RELATIONAL);
26      public static final Operator EQ       = new Operator("==", Precedence.EQUAL);
27      public static final Operator LE       = new Operator("<=", Precedence.RELATIONAL);
28      public static final Operator GE       = new Operator(">=", Precedence.RELATIONAL);
29      public static final Operator NE       = new Operator("!=", Precedence.EQUAL);
30      public static final Operator COND_OR  = new Operator("||", Precedence.COND_OR);
31      public static final Operator COND_AND = new Operator("&&", Precedence.COND_AND);
32      public static final Operator ADD      = new Operator("+", Precedence.ADD);
33      public static final Operator SUB      = new Operator("-", Precedence.ADD);
34      public static final Operator MUL      = new Operator("*", Precedence.MUL);
35      public static final Operator DIV      = new Operator("/", Precedence.MUL);
36      public static final Operator MOD      = new Operator("%", Precedence.MUL);
37      public static final Operator BIT_OR   = new Operator("|", Precedence.BIT_OR);
38      public static final Operator BIT_AND  = new Operator("&", Precedence.BIT_AND);
39      public static final Operator BIT_XOR  = new Operator("^", Precedence.BIT_XOR);
40      public static final Operator SHL      = new Operator("<<", Precedence.SHIFT);
41      public static final Operator SHR      = new Operator(">>", Precedence.SHIFT);
42      public static final Operator USHR     = new Operator(">>>", Precedence.SHIFT);
43  
44      /**
45       * Left child of the binary.
46       */
47      Expr left();
48  
49      /**
50       * Set the left child of the binary.
51       */
52      Binary left(Expr left);
53  
54      /**
55       * The binary's operator.
56       */
57      Operator operator();
58  
59      /**
60       * Set the binary's operator.
61       */
62      Binary operator(Operator op);
63  
64      /**
65       * Right child of the binary.
66       */
67      Expr right();
68  
69      /**
70       * Set the right child of the binary.
71       */
72      Binary right(Expr right);
73  
74      /**
75       * Returns true if the binary might throw an arithmetic exception,
76       * such as division by zero.
77       */
78      boolean throwsArithmeticException();
79  
80      /**
81       * Set the precedence of the expression.
82       */
83      Binary precedence(Precedence precedence);
84  }
85
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