bsh.BSHBlock Maven / Gradle / Ivy
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* The AIBench Shell Plugin
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* Copyright (C) 2006 - 2017 Daniel Glez-Peña and Florentino Fdez-Riverola
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/*****************************************************************************
* *
* 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 *
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* do not delete the provisions above, a recipient may use your version of *
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* *
* Patrick Niemeyer ([email protected]) *
* Author of Learning Java, O'Reilly & Associates *
* http://www.pat.net/~pat/ *
* *
*****************************************************************************/
package bsh;
class BSHBlock extends SimpleNode {
public boolean isSynchronized = false;
BSHBlock(int id) {
super(id);
}
public Object eval(CallStack callstack, Interpreter interpreter) throws EvalError {
return eval(callstack, interpreter, false);
}
/**
* @param overrideNamespace
* if set to true the block will be executed in the
* current namespace (not a subordinate one).
*
* If true *no* new BlockNamespace will be swapped onto
* the stack and the eval will happen in the current top
* namespace. This is used by BshMethod, TryStatement,
* etc. which must intialize the block first and also for
* those that perform multiple passes in the same block.
*/
public Object eval(CallStack callstack, Interpreter interpreter, boolean overrideNamespace) throws EvalError {
Object syncValue = null;
if (isSynchronized) {
// First node is the expression on which to sync
SimpleNode exp = ((SimpleNode) jjtGetChild(0));
syncValue = exp.eval(callstack, interpreter);
}
Object ret;
if (isSynchronized) // Do the actual synchronization
synchronized (syncValue) {
ret = evalBlock(callstack, interpreter, overrideNamespace, null/* filter */);
}
else
ret = evalBlock(callstack, interpreter, overrideNamespace, null/* filter */);
return ret;
}
Object evalBlock(CallStack callstack, Interpreter interpreter, boolean overrideNamespace, NodeFilter nodeFilter) throws EvalError {
Object ret = Primitive.VOID;
NameSpace enclosingNameSpace = null;
if (!overrideNamespace) {
enclosingNameSpace = callstack.top();
BlockNameSpace bodyNameSpace = new BlockNameSpace(enclosingNameSpace);
callstack.swap(bodyNameSpace);
}
int startChild = isSynchronized ? 1 : 0;
int numChildren = jjtGetNumChildren();
try {
/*
* Evaluate block in two passes: First do class
* declarations then do everything else.
*/
for (int i = startChild; i < numChildren; i++) {
SimpleNode node = ((SimpleNode) jjtGetChild(i));
if (nodeFilter != null && !nodeFilter.isVisible(node))
continue;
if (node instanceof BSHClassDeclaration)
node.eval(callstack, interpreter);
}
for (int i = startChild; i < numChildren; i++) {
SimpleNode node = ((SimpleNode) jjtGetChild(i));
if (node instanceof BSHClassDeclaration)
continue;
// filter nodes
if (nodeFilter != null && !nodeFilter.isVisible(node))
continue;
ret = node.eval(callstack, interpreter);
// statement or embedded block evaluated a
// return statement
if (ret instanceof ReturnControl)
break;
}
} finally {
// make sure we put the namespace back when we leave.
if (!overrideNamespace)
callstack.swap(enclosingNameSpace);
}
return ret;
}
public interface NodeFilter {
public boolean isVisible(SimpleNode node);
}
}