Expr


1   package polyglot.ast;
2   
3   import polyglot.types.Type;
4   import polyglot.util.CodeWriter;
5   import polyglot.visit.PrettyPrinter;
6   
7   /**
8    * An <code>Expr</code> represents any Java expression.  All expressions
9    * must be subtypes of Expr.
10   */
11  public interface Expr extends Receiver, Term
12  {
13      /**
14       * Return an equivalent expression, but with the type <code>type</code>.
15       */
16      Expr type(Type type);
17  
18      /** Get the precedence of the expression. */
19      Precedence precedence();
20  
21      /**
22       * Return whether the expression evaluates to a constant.
23       * This is not valid until after disambiguation.
24       */
25      boolean isConstant();
26  
27      /** Returns the constant value of the expression, if any. */
28      Object   constantValue();
29      
30      /**
31       * Correctly parenthesize the subexpression <code>expr<code>
32       * based on its precedence and the precedence of this expression.
33       *
34       * If the sub-expression has the same precedence as this expression
35       * we parenthesize if the sub-expression does not associate; e.g.,
36       * we parenthesis the right sub-expression of a left-associative
37       * operator.
38       */
39       void printSubExpr(Expr expr, boolean associative,
40                         CodeWriter w, PrettyPrinter pp);
41  
42      /**
43       * Correctly parenthesize the subexpression <code>expr<code>
44       * based on its precedence and the precedence of this expression.
45       *
46       * This is equivalent to <code>printSubexpr(expr, true, w, pp)</code>
47       */
48      void printSubExpr(Expr expr, CodeWriter w, PrettyPrinter pp);
49  }
50
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