BSHArguments


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30   *  http://www.pat.net/~pat/                                                 *
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33  
34  
35  package bsh;
36  
37  class BSHArguments extends SimpleNode
38  {
39      BSHArguments(int id) { super(id); }
40  
41      /**
42          This node holds a set of arguments for a method invocation or
43          constructor call.
44  
45          Note: arguments are not currently allowed to be VOID.
46      */
47      /*
48          Disallowing VOIDs here was an easy way to support the throwing of a 
49          more descriptive error message on use of an undefined argument to a 
50          method call (very common).  If it ever turns out that we need to 
51          support that for some reason we'll have to re-evaluate how we get 
52          "meta-information" about the arguments in the various invoke() methods 
53          that take Object [].  We could either pass BSHArguments down to 
54          overloaded forms of the methods or throw an exception subtype 
55          including the argument position back up, where the error message would
56          be compounded.
57      */
58      public Object  [] getArguments( CallStack callstack, Interpreter interpreter)
59          throws EvalError
60      {
61          // evaluate each child
62          Object  [] args = new Object  [jjtGetNumChildren()];
63          for(int i = 0; i < args.length; i++)
64          {
65              args[i] = ((SimpleNode)jjtGetChild(i)).eval(callstack, interpreter);
66              if ( args[i] == Primitive.VOID )
67                  throw new EvalError( "Undefined argument: " + 
68                      ((SimpleNode)jjtGetChild(i)).getText(), this, callstack );
69          }
70  
71          return args;
72      }
73  }
74  
75
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