author | erikj |
Tue, 12 Sep 2017 19:03:39 +0200 | |
changeset 47216 | 71c04702a3d5 |
parent 27357 | nashorn/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/runtime/ECMAException.java@8caab9a29b62 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package jdk.nashorn.internal.runtime; |
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import static jdk.nashorn.internal.codegen.CompilerConstants.staticCallNoLookup; |
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import static jdk.nashorn.internal.codegen.CompilerConstants.virtualField; |
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import static jdk.nashorn.internal.runtime.ScriptRuntime.UNDEFINED; |
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import javax.script.ScriptException; |
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import jdk.nashorn.api.scripting.NashornException; |
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import jdk.nashorn.internal.codegen.CompilerConstants.Call; |
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import jdk.nashorn.internal.codegen.CompilerConstants.FieldAccess; |
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/** |
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* Exception used to implement ECMAScript "throw" from scripts. The actual thrown |
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* object from script need not be a Java exception and so it is wrapped as an |
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* instance field called "thrown" here. This exception class is also used to |
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* represent ECMA errors thrown from runtime code (for example, TypeError, |
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* ReferenceError thrown from Nashorn engine runtime). |
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*/ |
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@SuppressWarnings("serial") |
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public final class ECMAException extends NashornException { |
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/** |
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* Method handle pointing to the constructor {@link ECMAException#create(Object, String, int, int)}, |
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*/ |
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public static final Call CREATE = staticCallNoLookup(ECMAException.class, "create", ECMAException.class, Object.class, String.class, int.class, int.class); |
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/** Field handle to the{@link ECMAException#thrown} field, so that it can be accessed from generated code */ |
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public static final FieldAccess THROWN = virtualField(ECMAException.class, "thrown", Object.class); |
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private static final String EXCEPTION_PROPERTY = "nashornException"; |
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/** Object thrown. */ |
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public final Object thrown; |
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/** |
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* Constructor. Called from the factory method 'create'. |
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* |
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* @param thrown object to be thrown |
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* @param fileName script file name |
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* @param line line number of throw |
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* @param column column number of throw |
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*/ |
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private ECMAException(final Object thrown, final String fileName, final int line, final int column) { |
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super(ScriptRuntime.safeToString(thrown), asThrowable(thrown), fileName, line, column); |
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this.thrown = thrown; |
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setExceptionToThrown(); |
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} |
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/** |
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* Constructor. This is called from the runtime code. |
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* |
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* @param thrown object to be thrown |
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* @param cause Java exception that triggered this throw |
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*/ |
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public ECMAException(final Object thrown, final Throwable cause) { |
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super(ScriptRuntime.safeToString(thrown), cause); |
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this.thrown = thrown; |
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setExceptionToThrown(); |
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} |
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/** |
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* Factory method to retrieve the underlying exception or create an exception. |
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* This method is called from the generated code. |
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* |
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* @param thrown object to be thrown |
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* @param fileName script file name |
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* @param line line number of throw |
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* @param column column number of throw |
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* @return ECMAException object |
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*/ |
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public static ECMAException create(final Object thrown, final String fileName, final int line, final int column) { |
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// If thrown object is an Error or sub-object like TypeError, then |
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// an ECMAException object has been already initialized at constructor. |
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if (thrown instanceof ScriptObject) { |
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final Object exception = getException((ScriptObject)thrown); |
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if (exception instanceof ECMAException) { |
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final ECMAException ee = (ECMAException)exception; |
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// Make sure exception has correct thrown reference because that's what will end up getting caught. |
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if (ee.getThrown() == thrown) { |
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// copy over file name, line number and column number. |
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ee.setFileName(fileName); |
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ee.setLineNumber(line); |
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ee.setColumnNumber(column); |
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return ee; |
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} |
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} |
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} |
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return new ECMAException(thrown, fileName, line, column); |
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} |
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/** |
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* Get the thrown object |
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* @return thrown object |
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*/ |
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@Override |
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public Object getThrown() { |
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return thrown; |
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} |
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@Override |
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public String toString() { |
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final StringBuilder sb = new StringBuilder(); |
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final String fileName = getFileName(); |
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final int line = getLineNumber(); |
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final int column = getColumnNumber(); |
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if (fileName != null) { |
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sb.append(fileName); |
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if (line >= 0) { |
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sb.append(':'); |
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sb.append(line); |
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} |
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if (column >= 0) { |
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sb.append(':'); |
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sb.append(column); |
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} |
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sb.append(' '); |
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} else { |
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sb.append("ECMAScript Exception: "); |
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} |
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sb.append(getMessage()); |
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return sb.toString(); |
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} |
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/** |
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* Get the {@link ECMAException}, i.e. the underlying Java object for the |
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* JavaScript error object from a {@link ScriptObject} representing an error |
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* |
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* @param errObj the error object |
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* @return a {@link ECMAException} |
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*/ |
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public static Object getException(final ScriptObject errObj) { |
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// Exclude inherited properties that may belong to errors in the prototype chain. |
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if (errObj.hasOwnProperty(ECMAException.EXCEPTION_PROPERTY)) { |
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return errObj.get(ECMAException.EXCEPTION_PROPERTY); |
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} |
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return null; |
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} |
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/** |
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* Print the stack trace for a {@code ScriptObject} representing an error |
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* |
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* @param errObj the error object |
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* @return undefined |
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*/ |
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public static Object printStackTrace(final ScriptObject errObj) { |
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final Object exception = getException(errObj); |
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if (exception instanceof Throwable) { |
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((Throwable)exception).printStackTrace(Context.getCurrentErr()); |
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} else { |
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Context.err("<stack trace not available>"); |
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} |
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return UNDEFINED; |
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} |
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/** |
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* Get the line number for a {@code ScriptObject} representing an error |
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* |
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* @param errObj the error object |
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* @return the line number, or undefined if wrapped exception is not a ParserException |
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*/ |
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public static Object getLineNumber(final ScriptObject errObj) { |
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final Object e = getException(errObj); |
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if (e instanceof NashornException) { |
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return ((NashornException)e).getLineNumber(); |
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} else if (e instanceof ScriptException) { |
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return ((ScriptException)e).getLineNumber(); |
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} |
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return UNDEFINED; |
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} |
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/** |
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* Get the column number for a {@code ScriptObject} representing an error |
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* |
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* @param errObj the error object |
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* @return the column number, or undefined if wrapped exception is not a ParserException |
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*/ |
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public static Object getColumnNumber(final ScriptObject errObj) { |
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final Object e = getException(errObj); |
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if (e instanceof NashornException) { |
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return ((NashornException)e).getColumnNumber(); |
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} else if (e instanceof ScriptException) { |
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return ((ScriptException)e).getColumnNumber(); |
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} |
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return UNDEFINED; |
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} |
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/** |
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* Get the file name for a {@code ScriptObject} representing an error |
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* |
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* @param errObj the error object |
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* @return the file name, or undefined if wrapped exception is not a ParserException |
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*/ |
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public static Object getFileName(final ScriptObject errObj) { |
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final Object e = getException(errObj); |
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if (e instanceof NashornException) { |
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return ((NashornException)e).getFileName(); |
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} else if (e instanceof ScriptException) { |
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return ((ScriptException)e).getFileName(); |
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} |
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return UNDEFINED; |
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} |
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/** |
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* Stateless string conversion for an error object |
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* |
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* @param errObj the error object |
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* @return string representation of {@code errObj} |
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*/ |
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public static String safeToString(final ScriptObject errObj) { |
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Object name = UNDEFINED; |
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try { |
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name = errObj.get("name"); |
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} catch (final Exception e) { |
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//ignored |
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} |
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if (name == UNDEFINED) { |
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name = "Error"; |
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} else { |
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name = ScriptRuntime.safeToString(name); |
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} |
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Object msg = UNDEFINED; |
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try { |
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msg = errObj.get("message"); |
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} catch (final Exception e) { |
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//ignored |
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} |
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if (msg == UNDEFINED) { |
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msg = ""; |
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} else { |
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msg = ScriptRuntime.safeToString(msg); |
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} |
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if (((String)name).isEmpty()) { |
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return (String)msg; |
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} |
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if (((String)msg).isEmpty()) { |
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return (String)name; |
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} |
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return name + ": " + msg; |
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} |
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private static Throwable asThrowable(final Object obj) { |
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return (obj instanceof Throwable)? (Throwable)obj : null; |
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} |
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private void setExceptionToThrown() { |
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/* |
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* Nashorn extension: errorObject.nashornException |
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* Expose this exception via "nashornException" property of on the |
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* thrown object. This exception object can be used to print stack |
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* trace and fileName, line number etc. from script code. |
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*/ |
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if (thrown instanceof ScriptObject) { |
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final ScriptObject sobj = (ScriptObject)thrown; |
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if (!sobj.has(EXCEPTION_PROPERTY)) { |
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sobj.addOwnProperty(EXCEPTION_PROPERTY, Property.NOT_ENUMERABLE, this); |
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} else { |
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sobj.set(EXCEPTION_PROPERTY, this, 0); |
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} |
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} |
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} |
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} |