/jEdit/tags/jedit-4-2-pre14/bsh/BSHVariableDeclarator.java

/*****************************************************************************
 *                                                                           *
 *  This file is part of the BeanShell Java Scripting distribution.          *
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 *  Sun Public License Notice:                                               *
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 *  The contents of this file are subject to the Sun Public License Version  *
 *  1.0 (the "License"); you may not use this file except in compliance with *
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 *  The Original Code is BeanShell. The Initial Developer of the Original    *
 *  Code is Pat Niemeyer. Portions created by Pat Niemeyer are Copyright     *
 *  (C) 2000.  All Rights Reserved.                                          *
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 *                                                                           *
 *  Patrick Niemeyer (pat@pat.net)                                           *
 *  Author of Learning Java, O'Reilly & Associates                           *
 *  http://www.pat.net/~pat/                                                 *
 *                                                                           *
 *****************************************************************************/


package bsh;

/**
	name [ = initializer ]
	evaluate name and return optional initializer
*/
class BSHVariableDeclarator extends SimpleNode
{
	// The token.image text of the name... never changes.
    public String name;

    BSHVariableDeclarator(int id) { super(id); }

	/**
		Evaluate the optional initializer value.  
		(The name was set at parse time.)

		A variable declarator can be evaluated with or without preceding
		type information. Currently the type info is only used by array 
		initializers in the case where there is no explicitly declared type.

		@param typeNode is the BSHType node.  Its info is passed through to any
		variable intializer children for the case where the array initializer
		does not declare the type explicitly. e.g.
			int [] a = { 1, 2 };
		typeNode may be null to indicate no type information available.
	*/
    public Object eval( 
		BSHType typeNode, CallStack callstack, Interpreter interpreter)  
		throws EvalError
    {
		// null value means no value
		Object value = null;

        if ( jjtGetNumChildren() > 0 ) 
		{
            SimpleNode initializer = (SimpleNode)jjtGetChild(0);

			/*
				If we have type info and the child is an array initializer
				pass it along...  Else use the default eval style.
				(This allows array initializer to handle the problem... 
				allowing for future enhancements in loosening types there).	
			*/
			if ( (typeNode != null) 
				&& initializer instanceof BSHArrayInitializer 
			)
            	value = ((BSHArrayInitializer)initializer).eval( 
					typeNode.getBaseType(), typeNode.getArrayDims(), 
					callstack, interpreter);
			else
				value = initializer.eval( callstack, interpreter);
		}

		if ( value == Primitive.VOID )
            throw new EvalError("Void initializer.", this, callstack );

        return value;
    }

	public String toString() { return "BSHVariableDeclarator "+name; }
}