/jEdit/tags/jedit-4-2-pre14/bsh/BSHBlock.java
Java | 149 lines | 79 code | 20 blank | 50 comment | 15 complexity | 64fb2b1268f0f9b459555ff3966e28c4 MD5 | raw file
Possible License(s): BSD-3-Clause, AGPL-1.0, Apache-2.0, LGPL-2.0, LGPL-3.0, GPL-2.0, CC-BY-SA-3.0, LGPL-2.1, GPL-3.0, MPL-2.0-no-copyleft-exception, IPL-1.0
- /*****************************************************************************
- * *
- * 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 (pat@pat.net) *
- * 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).
- <p>
- 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 );
- }
- }