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js/rhino/src/org/mozilla/javascript/DebuggableEngineImpl.java

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+/* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ *
+ * The contents of this file are subject to the Netscape Public
+ * License Version 1.1 (the "License"); you may not use this file
+ * except in compliance with the License. You may obtain a copy of
+ * the License at http://www.mozilla.org/NPL/
+ *
+ * Software distributed under the License is distributed on an "AS
+ * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express oqr
+ * implied. See the License for the specific language governing
+ * rights and limitations under the License.
+ *
+ * The Original Code is Rhino code, released
+ * May 6, 1999.
+ *
+ * The Initial Developer of the Original Code is Netscape
+ * Communications Corporation.  Portions created by Netscape are
+ * Copyright (C) 1997-2000 Netscape Communications Corporation. All
+ * Rights Reserved.
+ *
+ * Contributor(s): 
+ * Norris Boyd
+ *
+ * Alternatively, the contents of this file may be used under the
+ * terms of the GNU Public License (the "GPL"), in which case the
+ * provisions of the GPL are applicable instead of those above.
+ * If you wish to allow use of your version of this file only
+ * under the terms of the GPL and not to allow others to use your
+ * version of this file under the NPL, indicate your decision by
+ * deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL.  If you do not delete
+ * the provisions above, a recipient may use your version of this
+ * file under either the NPL or the GPL.
+ */
+
+// API class
+
+package org.mozilla.javascript;
+
+import org.mozilla.javascript.debug.*;
+
+public class DebuggableEngineImpl implements DebuggableEngine {
+  
+    public DebuggableEngineImpl(Context cx) {
+        this.cx = cx;
+    }
+
+    /**
+     * Set whether the engine should break when it encounters
+     * the next line.
+     * <p>
+     * The engine will call the attached debugger's handleBreakpointHit
+     * method on the next line it executes if isLineStep is true.
+     * May be used from another thread to interrupt execution.
+     * 
+     * @param isLineStep if true, break next line
+     */
+    public void setBreakNextLine(boolean isLineStep) {
+        cx.inLineStepMode = isLineStep;
+    }
+    
+    /**
+     * Return the value of the breakNextLine flag.
+     * @return true if the engine will break on execution of the 
+     * next line.
+     */
+    public boolean getBreakNextLine() {
+        return cx.inLineStepMode;
+    }
+
+    /**
+     * Set the associated debugger.
+     * @param debugger the debugger to be used on callbacks from
+     * the engine.
+     */
+    public void setDebugger(Debugger debugger) {
+        cx.debugger = debugger;
+    }
+    
+    /**
+     * Return the current debugger.
+     * @return the debugger, or null if none is attached.
+     */
+    public Debugger getDebugger() {
+        return cx.debugger;
+    }
+    
+    /**
+     * Return the number of frames in current execution.
+     * @return the count of current frames
+     */
+    public int getFrameCount() {
+        return cx.frameStack == null ? 0 : cx.frameStack.size();
+    }
+    
+    /**
+     * Return a frame from the current execution.
+     * Frames are numbered starting from 0 for the innermost
+     * frame.
+     * @param frameNumber the number of the frame in the range
+     *        [0,frameCount-1]
+     * @return the relevant DebugFrame, or null if frameNumber is out
+     *         of range or the engine isn't currently saving 
+     *         frames
+     */
+    public DebugFrame getFrame(int frameNumber) {
+        return (DebugFrame) cx.frameStack.elementAt(cx.frameStack.size() - frameNumber - 1);
+    }
+    
+    private Context cx;
+}