bsh.BSHPrimaryExpression Maven / Gradle / Ivy
/*
* #%L
* The AIBench Shell Plugin
* %%
* Copyright (C) 2006 - 2017 Daniel Glez-Peña and Florentino Fdez-Riverola
* %%
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Lesser Public License for more details.
*
* You should have received a copy of the GNU General Lesser Public
* License along with this program. If not, see
* .
* #L%
*/
/*****************************************************************************
* *
* This file is part of the BeanShell Java Scripting distribution. *
* Documentation and updates may be found at http://www.beanshell.org/ *
* *
* Sun Public License Notice: *
* *
* 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 *
* the License. A copy of the License is available at http://www.sun.com *
* *
* 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. *
* *
* GNU Public License Notice: *
* *
* Alternatively, the contents of this file may be used under the terms of *
* the GNU Lesser General Public License (the "LGPL"), in which case the *
* provisions of LGPL are applicable instead of those above. If you wish to *
* allow use of your version of this file only under the terms of the LGPL *
* and not to allow others to use your version of this file under the SPL, *
* indicate your decision by deleting the provisions above and replace *
* them with the notice and other provisions required by the LGPL. If you *
* do not delete the provisions above, a recipient may use your version of *
* this file under either the SPL or the LGPL. *
* *
* Patrick Niemeyer ([email protected]) *
* Author of Learning Java, O'Reilly & Associates *
* http://www.pat.net/~pat/ *
* *
*****************************************************************************/
package bsh;
class BSHPrimaryExpression extends SimpleNode {
BSHPrimaryExpression(int id) {
super(id);
}
/**
* Evaluate to a value object.
*/
public Object eval(CallStack callstack, Interpreter interpreter) throws EvalError {
return eval(false, callstack, interpreter);
}
/**
* Evaluate to a value object.
*/
public LHS toLHS(CallStack callstack, Interpreter interpreter) throws EvalError {
Object obj = eval(true, callstack, interpreter);
if (!(obj instanceof LHS))
throw new EvalError("Can't assign to:", this, callstack);
else
return (LHS) obj;
}
/*
* Our children are a prefix expression and any number of suffixes.
*
* We don't eval() any nodes until the suffixes have had an opportunity
* to work through them. This lets the suffixes decide how to interpret
* an ambiguous name (e.g. for the .class operation).
*/
private Object eval(boolean toLHS, CallStack callstack, Interpreter interpreter) throws EvalError {
Object obj = jjtGetChild(0);
int numChildren = jjtGetNumChildren();
for (int i = 1; i < numChildren; i++)
obj = ((BSHPrimarySuffix) jjtGetChild(i)).doSuffix(obj, toLHS, callstack, interpreter);
/*
* If the result is a Node eval() it to an object or LHS (as
* determined by toLHS)
*/
if (obj instanceof SimpleNode)
if (obj instanceof BSHAmbiguousName)
if (toLHS)
obj = ((BSHAmbiguousName) obj).toLHS(callstack, interpreter);
else
obj = ((BSHAmbiguousName) obj).toObject(callstack, interpreter);
else
// Some arbitrary kind of node
if (toLHS)
// is this right?
throw new EvalError("Can't assign to prefix.", this, callstack);
else
obj = ((SimpleNode) obj).eval(callstack, interpreter);
// return LHS or value object as determined by toLHS
if (obj instanceof LHS)
if (toLHS)
return obj;
else
try {
return ((LHS) obj).getValue();
} catch (UtilEvalError e) {
throw e.toEvalError(this, callstack);
}
else
return obj;
}
}