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/* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0
*
* The contents of this file are subject to the Mozilla 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/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or 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 the Initial Developer are Copyright (C) 1997-2000
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* the GNU General Public License Version 2 or later (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
* MPL, indicate your decision by deleting the provisions above and replacing
* 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 MPL or the GPL.
*
* ***** END LICENSE BLOCK ***** */
// API class
package org.mozilla.javascript;
import java.beans.*;
import java.io.*;
import java.util.Hashtable;
import java.util.Locale;
import java.lang.reflect.*;
import org.mozilla.javascript.debug.*;
import org.mozilla.javascript.xml.XMLLib;
/**
* This class represents the runtime context of an executing script.
*
* Before executing a script, an instance of Context must be created
* and associated with the thread that will be executing the script.
* The Context will be used to store information about the executing
* of the script such as the call stack. Contexts are associated with
* the current thread using the {@link #call(ContextAction)}
* or {@link #enter()} methods.
*
* Different forms of script execution are supported. Scripts may be
* evaluated from the source directly, or first compiled and then later
* executed. Interactive execution is also supported.
*
* Some aspects of script execution, such as type conversions and
* object creation, may be accessed directly through methods of
* Context.
*
* @see Scriptable
* @author Norris Boyd
* @author Brendan Eich
*/
public class Context
{
/**
* Language versions.
*
* All integral values are reserved for future version numbers.
*/
/**
* The unknown version.
*/
public static final int VERSION_UNKNOWN = -1;
/**
* The default version.
*/
public static final int VERSION_DEFAULT = 0;
/**
* JavaScript 1.0
*/
public static final int VERSION_1_0 = 100;
/**
* JavaScript 1.1
*/
public static final int VERSION_1_1 = 110;
/**
* JavaScript 1.2
*/
public static final int VERSION_1_2 = 120;
/**
* JavaScript 1.3
*/
public static final int VERSION_1_3 = 130;
/**
* JavaScript 1.4
*/
public static final int VERSION_1_4 = 140;
/**
* JavaScript 1.5
*/
public static final int VERSION_1_5 = 150;
/**
* JavaScript 1.5
*/
public static final int VERSION_1_6 = 160;
/**
* Controls behaviour of Date.prototype.getYear().
* If hasFeature(FEATURE_NON_ECMA_GET_YEAR) returns true,
* Date.prototype.getYear subtructs 1900 only if 1900 <= date < 2000.
* The default behavior of {@link #hasFeature(int)} is always to subtruct
* 1900 as rquired by ECMAScript B.2.4.
*/
public static final int FEATURE_NON_ECMA_GET_YEAR = 1;
/**
* Control if member expression as function name extension is available.
* If hasFeature(FEATURE_MEMBER_EXPR_AS_FUNCTION_NAME) returns
* true, allow function memberExpression(args) { body } to be
* syntax sugar for memberExpression = function(args) { body },
* when memberExpression is not a simple identifier.
* See ECMAScript-262, section 11.2 for definition of memberExpression.
* By default {@link #hasFeature(int)} returns false.
*/
public static final int FEATURE_MEMBER_EXPR_AS_FUNCTION_NAME = 2;
/**
* Control if reserved keywords are treated as identifiers.
* If hasFeature(RESERVED_KEYWORD_AS_IDENTIFIER) returns true,
* treat future reserved keyword (see Ecma-262, section 7.5.3) as ordinary
* identifiers but warn about this usage.
*
* By default {@link #hasFeature(int)} returns false.
*/
public static final int FEATURE_RESERVED_KEYWORD_AS_IDENTIFIER = 3;
/**
* Control if toString() should returns the same result
* as toSource() when applied to objects and arrays.
* If hasFeature(FEATURE_TO_STRING_AS_SOURCE) returns true,
* calling toString() on JS objects gives the same result as
* calling toSource(). That is it returns JS source with code
* to create an object with all enumeratable fields of the original object
* instead of printing [object result of
* {@link Scriptable#getClassName()}].
*
* By default {@link #hasFeature(int)} returns true only if
* the current JS version is set to {@link #VERSION_1_2}.
*/
public static final int FEATURE_TO_STRING_AS_SOURCE = 4;
/**
* Control if properties __proto__ and __parent__
* are treated specially.
* If hasFeature(FEATURE_PARENT_PROTO_PROPRTIES) returns true,
* treat __parent__ and __proto__ as special properties.
*
* The properties allow to query and set scope and prototype chains for the
* objects. The special meaning of the properties is available
* only when they are used as the right hand side of the dot operator.
* For example, while x.__proto__ = y changes the prototype
* chain of the object x to point to y,
* x["__proto__"] = y simply assigns a new value to the property
* __proto__ in x even when the feature is on.
*
* By default {@link #hasFeature(int)} returns true.
*/
public static final int FEATURE_PARENT_PROTO_PROPRTIES = 5;
/**
* Control if support for E4X(ECMAScript for XML) extension is available.
* If hasFeature(FEATURE_E4X) returns true, the XML syntax is available.
*
* By default {@link #hasFeature(int)} returns true if
* the current JS version is set to {@link #VERSION_DEFAULT}
* or is greater then {@link #VERSION_1_6}.
* @since 1.6 Release 1
*/
public static final int FEATURE_E4X = 6;
/**
* Control if dynamic scope should be used for name access.
* If hasFeature(FEATURE_DYNAMIC_SCOPE) returns true, then the name lookup
* during name resolution will use the top scope of the script or function
* which is at the top of JS execution stack instead of the top scope of the
* script or function from the current stack frame if the top scope of
* the top stack frame contains the top scope of the current stack frame
* on its prototype chain.
*
* This is useful to define shared scope containing functions that can
* be called from scripts and functions using private scopes.
*
* By default {@link #hasFeature(int)} returns false.
* @since 1.6 Release 1
*/
public static final int FEATURE_DYNAMIC_SCOPE = 7;
/**
* Control if strict variable mode is enabled.
* When the feature is on Rhino reports runtime errors if assignment
* to a global variable that does not exist is executed. When the feature
* is off such assignments creates new variable in the global scope as
* required by ECMA 262.
*
* By default {@link #hasFeature(int)} returns false.
* @since 1.6 Release 1
*/
public static final int FEATURE_STRICT_VARS = 8;
/**
* Control if strict eval mode is enabled.
* When the feature is on Rhino reports runtime errors if non-string
* argument is passed to the eval function. When the feature is off
* eval simply return non-string argument as is without performing any
* evaluation as required by ECMA 262.
*
* By default {@link #hasFeature(int)} returns false.
* @since 1.6 Release 1
*/
public static final int FEATURE_STRICT_EVAL = 9;
public static final String languageVersionProperty = "language version";
public static final String errorReporterProperty = "error reporter";
/**
* Convinient value to use as zero-length array of objects.
*/
public static final Object[] emptyArgs = ScriptRuntime.emptyArgs;
/**
* Create a new Context.
*
* Note that the Context must be associated with a thread before
* it can be used to execute a script.
*
* @see #enter()
* @see #call(ContextAction)
*/
public Context()
{
setLanguageVersion(VERSION_DEFAULT);
optimizationLevel = codegenClass != null ? 0 : -1;
maximumInterpreterStackDepth = Integer.MAX_VALUE;
}
/**
* Get the current Context.
*
* The current Context is per-thread; this method looks up
* the Context associated with the current thread.
*
* @return the Context associated with the current thread, or
* null if no context is associated with the current
* thread.
* @see org.mozilla.javascript.Context#enter()
* @see org.mozilla.javascript.Context#exit()
*/
public static Context getCurrentContext()
{
Object helper = VMBridge.instance.getThreadContextHelper();
return VMBridge.instance.getContext(helper);
}
/**
* Get a context associated with the current thread, creating
* one if need be.
*
* The Context stores the execution state of the JavaScript
* engine, so it is required that the context be entered
* before execution may begin. Once a thread has entered
* a Context, then getCurrentContext() may be called to find
* the context that is associated with the current thread.
*
* Calling enter() will
* return either the Context currently associated with the
* thread, or will create a new context and associate it
* with the current thread. Each call to enter()
* must have a matching call to exit(). For example,
*
* Context cx = Context.enter();
* try {
* ...
* cx.evaluateString(...);
* } finally {
* Context.exit();
* }
*
* Instead of using enter(), exit() pair consider using
* {@link #call(ContextAction)} which guarantees proper
* association of Context instances with the current thread and is faster.
* With this method the above example becomes:
*
* Context.call(new ContextAction() {
* public Object run(Context cx) {
* ...
* cx.evaluateString(...);
* return null;
* }
* });
*
*
* @return a Context associated with the current thread
* @see #getCurrentContext()
* @see #exit()
* @see #call(ContextAction)
*/
public static Context enter()
{
return enter(null);
}
/**
* Get a Context associated with the current thread, using
* the given Context if need be.
*
* The same as enter() except that cx
* is associated with the current thread and returned if
* the current thread has no associated context and cx
* is not associated with any other thread.
* @param cx a Context to associate with the thread if possible
* @return a Context associated with the current thread
*
* @see #enter()
* @see #call(ContextAction)
* @see ContextFactory#call(ContextAction)
*/
public static Context enter(Context cx)
{
return enter(cx, ContextFactory.getGlobal());
}
static final Context enter(Context cx, ContextFactory factory)
{
Object helper = VMBridge.instance.getThreadContextHelper();
Context old = VMBridge.instance.getContext(helper);
if (old != null) {
if (cx != null && cx != old && cx.enterCount != 0) {
// The suplied context must be the context for
// the current thread if it is already entered
throw new IllegalArgumentException(
"Cannot enter Context active on another thread");
}
if (old.factory != null) {
// Context with associated factory will be released
// automatically and does not need to change enterCount
return old;
}
if (old.sealed) onSealedMutation();
cx = old;
} else {
if (cx == null) {
cx = factory.makeContext();
} else {
if (cx.sealed) onSealedMutation();
}
if (cx.enterCount != 0 || cx.factory != null) {
throw new IllegalStateException();
}
if (!cx.creationEventWasSent) {
cx.creationEventWasSent = true;
factory.onContextCreated(cx);
}
}
if (old == null) {
VMBridge.instance.setContext(helper, cx);
}
++cx.enterCount;
return cx;
}
/**
* Exit a block of code requiring a Context.
*
* Calling exit() will remove the association between
* the current thread and a Context if the prior call to
* enter() on this thread newly associated a Context
* with this thread.
* Once the current thread no longer has an associated Context,
* it cannot be used to execute JavaScript until it is again associated
* with a Context.
*
* @see org.mozilla.javascript.Context#enter()
* @see #call(ContextAction)
* @see ContextFactory#call(ContextAction)
*/
public static void exit()
{
exit(ContextFactory.getGlobal());
}
static void exit(ContextFactory factory)
{
Object helper = VMBridge.instance.getThreadContextHelper();
Context cx = VMBridge.instance.getContext(helper);
if (cx == null) {
throw new IllegalStateException(
"Calling Context.exit without previous Context.enter");
}
if (cx.factory != null) {
// Context with associated factory will be released
// automatically and does not need to change enterCount
return;
}
if (cx.enterCount < 1) Kit.codeBug();
if (cx.sealed) onSealedMutation();
--cx.enterCount;
if (cx.enterCount == 0) {
VMBridge.instance.setContext(helper, null);
factory.onContextReleased(cx);
}
}
/**
* Call {@link ContextAction#run(Context cx)}
* using the Context instance associated with the current thread.
* If no Context is associated with the thread, then
* ContextFactory.getGlobal().makeContext() will be called to
* construct new Context instance. The instance will be temporary
* associated with the thread during call to
* {@link ContextAction#run(Context)}.
*
* @return The result of {@link ContextAction#run(Context)}.
*/
public static Object call(ContextAction action)
{
return call(ContextFactory.getGlobal(), action);
}
/**
* Call {@link
* Callable#call(Context cx, Scriptable scope, Scriptable thisObj,
* Object[] args)}
* using the Context instance associated with the current thread.
* If no Context is associated with the thread, then
* {@link ContextFactory#makeContext()} will be called to construct
* new Context instance. The instance will be temporary associated
* with the thread during call to {@link ContextAction#run(Context)}.
*
* It is allowed to use null for factory argument
* in which case the factory associated with the scope will be
* used to create new context instances.
*
* @see ContextFactory#call(ContextAction)
*/
public static Object call(ContextFactory factory, Callable callable,
Scriptable scope, Scriptable thisObj,
Object[] args)
{
if (factory == null) {
factory = ContextFactory.getGlobal();
}
Object helper = VMBridge.instance.getThreadContextHelper();
Context cx = VMBridge.instance.getContext(helper);
if (cx != null) {
Object result;
if (cx.factory != null) {
result = callable.call(cx, scope, thisObj, args);
} else {
// Context was associated with the thread via Context.enter,
// set factory to make Context.enter/exit to be no-op
// during call
cx.factory = factory;
try {
result = callable.call(cx, scope, thisObj, args);
} finally {
cx.factory = null;
}
}
return result;
}
cx = prepareNewContext(factory, helper);
try {
return callable.call(cx, scope, thisObj, args);
} finally {
releaseContext(helper, cx);
}
}
/**
* The method implements {@links ContextFactory#call(ContextAction)} logic.
*/
static Object call(ContextFactory factory, ContextAction action)
{
Object helper = VMBridge.instance.getThreadContextHelper();
Context cx = VMBridge.instance.getContext(helper);
if (cx != null) {
if (cx.factory != null) {
return action.run(cx);
} else {
cx.factory = factory;
try {
return action.run(cx);
} finally {
cx.factory = null;
}
}
}
cx = prepareNewContext(factory, helper);
try {
return action.run(cx);
} finally {
releaseContext(helper, cx);
}
}
private static Context prepareNewContext(ContextFactory factory,
Object contextHelper)
{
Context cx = factory.makeContext();
if (cx.factory != null || cx.enterCount != 0) {
throw new IllegalStateException("factory.makeContext() returned Context instance already associated with some thread");
}
cx.factory = factory;
factory.onContextCreated(cx);
if (factory.isSealed() && !cx.isSealed()) {
cx.seal(null);
}
VMBridge.instance.setContext(contextHelper, cx);
return cx;
}
private static void releaseContext(Object contextHelper, Context cx)
{
VMBridge.instance.setContext(contextHelper, null);
try {
cx.factory.onContextReleased(cx);
} finally {
cx.factory = null;
}
}
/**
* @deprecated
* @see ContextFactory#addListener(ContextFactory.Listener)
* @see ContextFactory#getGlobal()
*/
public static void addContextListener(ContextListener listener)
{
// Special workaround for the debugger
String DBG = "org.mozilla.javascript.tools.debugger.Main";
if (DBG.equals(listener.getClass().getName())) {
Class cl = listener.getClass();
Class factoryClass = Kit.classOrNull(
"org.mozilla.javascript.ContextFactory");
Class[] sig = { factoryClass };
Object[] args = { ContextFactory.getGlobal() };
try {
Method m = cl.getMethod("attachTo", sig);
m.invoke(listener, args);
} catch (Exception ex) {
RuntimeException rex = new RuntimeException();
Kit.initCause(rex, ex);
throw rex;
}
return;
}
ContextFactory.getGlobal().addListener(listener);
}
/**
* @deprecated
* @see ContextFactory#removeListener(ContextFactory.Listener)
* @see ContextFactory#getGlobal()
*/
public static void removeContextListener(ContextListener listener)
{
ContextFactory.getGlobal().addListener(listener);
}
/**
* Return {@link ContextFactory} instance used to create this Context
* or the result of {@link ContextFactory#getGlobal()} if no factory
* was used for Context creation.
*/
public final ContextFactory getFactory()
{
ContextFactory result = factory;
if (result == null) {
result = ContextFactory.getGlobal();
}
return result;
}
/**
* Checks if this is a sealed Context. A sealed Context instance does not
* allow to modify any of its properties and will throw an exception
* on any such attempt.
* @see #seal(Object sealKey)
*/
public final boolean isSealed()
{
return sealed;
}
/**
* Seal this Context object so any attempt to modify any of its properties
* including calling {@link #enter()} and {@link #exit()} methods will
* throw an exception.
*
* If sealKey is not null, calling
* {@link #unseal(Object sealKey)} with the same key unseals
* the object. If sealKey is null, unsealing is no longer possible.
*
* @see #isSealed()
* @see #unseal(Object)
*/
public final void seal(Object sealKey)
{
if (sealed) onSealedMutation();
sealed = true;
this.sealKey = sealKey;
}
/**
* Unseal previously sealed Context object.
* The sealKey argument should not be null and should match
* sealKey suplied with the last call to
* {@link #seal(Object)} or an exception will be thrown.
*
* @see #isSealed()
* @see #seal(Object sealKey)
*/
public final void unseal(Object sealKey)
{
if (sealKey == null) throw new IllegalArgumentException();
if (this.sealKey != sealKey) throw new IllegalArgumentException();
if (!sealed) throw new IllegalStateException();
sealed = false;
this.sealKey = null;
}
static void onSealedMutation()
{
throw new IllegalStateException();
}
/**
* Get the current language version.
*
* The language version number affects JavaScript semantics as detailed
* in the overview documentation.
*
* @return an integer that is one of VERSION_1_0, VERSION_1_1, etc.
*/
public final int getLanguageVersion()
{
return version;
}
/**
* Set the language version.
*
*
* Setting the language version will affect functions and scripts compiled
* subsequently. See the overview documentation for version-specific
* behavior.
*
* @param version the version as specified by VERSION_1_0, VERSION_1_1, etc.
*/
public void setLanguageVersion(int version)
{
if (sealed) onSealedMutation();
checkLanguageVersion(version);
Object listeners = propertyListeners;
if (listeners != null && version != this.version) {
firePropertyChangeImpl(listeners, languageVersionProperty,
new Integer(this.version),
new Integer(version));
}
this.version = version;
}
public static boolean isValidLanguageVersion(int version)
{
switch (version) {
case VERSION_DEFAULT:
case VERSION_1_0:
case VERSION_1_1:
case VERSION_1_2:
case VERSION_1_3:
case VERSION_1_4:
case VERSION_1_5:
case VERSION_1_6:
return true;
}
return false;
}
public static void checkLanguageVersion(int version)
{
if (isValidLanguageVersion(version)) {
return;
}
throw new IllegalArgumentException("Bad language version: "+version);
}
/**
* Get the implementation version.
*
*
* The implementation version is of the form
*
* "name langVer release relNum date"
*
* where name is the name of the product, langVer is
* the language version, relNum is the release number, and
* date is the release date for that specific
* release in the form "yyyy mm dd".
*
* @return a string that encodes the product, language version, release
* number, and date.
*/
public final String getImplementationVersion()
{
// XXX Probably it would be better to embed this directly into source
// with special build preprocessing but that would require some ant
// tweaking and then replacing token in resource files was simpler
if (implementationVersion == null) {
implementationVersion
= ScriptRuntime.getMessage0("implementation.version");
}
return implementationVersion;
}
/**
* Get the current error reporter.
*
* @see org.mozilla.javascript.ErrorReporter
*/
public final ErrorReporter getErrorReporter()
{
if (errorReporter == null) {
return DefaultErrorReporter.instance;
}
return errorReporter;
}
/**
* Change the current error reporter.
*
* @return the previous error reporter
* @see org.mozilla.javascript.ErrorReporter
*/
public final ErrorReporter setErrorReporter(ErrorReporter reporter)
{
if (sealed) onSealedMutation();
if (reporter == null) throw new IllegalArgumentException();
ErrorReporter old = getErrorReporter();
if (reporter == old) {
return old;
}
Object listeners = propertyListeners;
if (listeners != null) {
firePropertyChangeImpl(listeners, errorReporterProperty,
old, reporter);
}
this.errorReporter = reporter;
return old;
}
/**
* Get the current locale. Returns the default locale if none has
* been set.
*
* @see java.util.Locale
*/
public final Locale getLocale()
{
if (locale == null)
locale = Locale.getDefault();
return locale;
}
/**
* Set the current locale.
*
* @see java.util.Locale
*/
public final Locale setLocale(Locale loc)
{
if (sealed) onSealedMutation();
Locale result = locale;
locale = loc;
return result;
}
/**
* Register an object to receive notifications when a bound property
* has changed
* @see java.beans.PropertyChangeEvent
* @see #removePropertyChangeListener(java.beans.PropertyChangeListener)
* @param l the listener
*/
public final void addPropertyChangeListener(PropertyChangeListener l)
{
if (sealed) onSealedMutation();
propertyListeners = Kit.addListener(propertyListeners, l);
}
/**
* Remove an object from the list of objects registered to receive
* notification of changes to a bounded property
* @see java.beans.PropertyChangeEvent
* @see #addPropertyChangeListener(java.beans.PropertyChangeListener)
* @param l the listener
*/
public final void removePropertyChangeListener(PropertyChangeListener l)
{
if (sealed) onSealedMutation();
propertyListeners = Kit.removeListener(propertyListeners, l);
}
/**
* Notify any registered listeners that a bounded property has changed
* @see #addPropertyChangeListener(java.beans.PropertyChangeListener)
* @see #removePropertyChangeListener(java.beans.PropertyChangeListener)
* @see java.beans.PropertyChangeListener
* @see java.beans.PropertyChangeEvent
* @param property the bound property
* @param oldValue the old value
* @param newVale the new value
*/
final void firePropertyChange(String property, Object oldValue,
Object newValue)
{
Object listeners = propertyListeners;
if (listeners != null) {
firePropertyChangeImpl(listeners, property, oldValue, newValue);
}
}
private void firePropertyChangeImpl(Object listeners, String property,
Object oldValue, Object newValue)
{
for (int i = 0; ; ++i) {
Object l = Kit.getListener(listeners, i);
if (l == null)
break;
if (l instanceof PropertyChangeListener) {
PropertyChangeListener pcl = (PropertyChangeListener)l;
pcl.propertyChange(new PropertyChangeEvent(
this, property, oldValue, newValue));
}
}
}
/**
* Report a warning using the error reporter for the current thread.
*
* @param message the warning message to report
* @param sourceName a string describing the source, such as a filename
* @param lineno the starting line number
* @param lineSource the text of the line (may be null)
* @param lineOffset the offset into lineSource where problem was detected
* @see org.mozilla.javascript.ErrorReporter
*/
public static void reportWarning(String message, String sourceName,
int lineno, String lineSource,
int lineOffset)
{
Context cx = Context.getContext();
cx.getErrorReporter().warning(message, sourceName, lineno,
lineSource, lineOffset);
}
/**
* Report a warning using the error reporter for the current thread.
*
* @param message the warning message to report
* @see org.mozilla.javascript.ErrorReporter
*/
public static void reportWarning(String message)
{
int[] linep = { 0 };
String filename = getSourcePositionFromStack(linep);
Context.reportWarning(message, filename, linep[0], null, 0);
}
/**
* Report an error using the error reporter for the current thread.
*
* @param message the error message to report
* @param sourceName a string describing the source, such as a filename
* @param lineno the starting line number
* @param lineSource the text of the line (may be null)
* @param lineOffset the offset into lineSource where problem was detected
* @see org.mozilla.javascript.ErrorReporter
*/
public static void reportError(String message, String sourceName,
int lineno, String lineSource,
int lineOffset)
{
Context cx = getCurrentContext();
if (cx != null) {
cx.getErrorReporter().error(message, sourceName, lineno,
lineSource, lineOffset);
} else {
throw new EvaluatorException(message, sourceName, lineno,
lineSource, lineOffset);
}
}
/**
* Report an error using the error reporter for the current thread.
*
* @param message the error message to report
* @see org.mozilla.javascript.ErrorReporter
*/
public static void reportError(String message)
{
int[] linep = { 0 };
String filename = getSourcePositionFromStack(linep);
Context.reportError(message, filename, linep[0], null, 0);
}
/**
* Report a runtime error using the error reporter for the current thread.
*
* @param message the error message to report
* @param sourceName a string describing the source, such as a filename
* @param lineno the starting line number
* @param lineSource the text of the line (may be null)
* @param lineOffset the offset into lineSource where problem was detected
* @return a runtime exception that will be thrown to terminate the
* execution of the script
* @see org.mozilla.javascript.ErrorReporter
*/
public static EvaluatorException reportRuntimeError(String message,
String sourceName,
int lineno,
String lineSource,
int lineOffset)
{
Context cx = getCurrentContext();
if (cx != null) {
return cx.getErrorReporter().
runtimeError(message, sourceName, lineno,
lineSource, lineOffset);
} else {
throw new EvaluatorException(message, sourceName, lineno,
lineSource, lineOffset);
}
}
static EvaluatorException reportRuntimeError0(String messageId)
{
String msg = ScriptRuntime.getMessage0(messageId);
return reportRuntimeError(msg);
}
static EvaluatorException reportRuntimeError1(String messageId,
Object arg1)
{
String msg = ScriptRuntime.getMessage1(messageId, arg1);
return reportRuntimeError(msg);
}
static EvaluatorException reportRuntimeError2(String messageId,
Object arg1, Object arg2)
{
String msg = ScriptRuntime.getMessage2(messageId, arg1, arg2);
return reportRuntimeError(msg);
}
static EvaluatorException reportRuntimeError3(String messageId,
Object arg1, Object arg2,
Object arg3)
{
String msg = ScriptRuntime.getMessage3(messageId, arg1, arg2, arg3);
return reportRuntimeError(msg);
}
static EvaluatorException reportRuntimeError4(String messageId,
Object arg1, Object arg2,
Object arg3, Object arg4)
{
String msg
= ScriptRuntime.getMessage4(messageId, arg1, arg2, arg3, arg4);
return reportRuntimeError(msg);
}
/**
* Report a runtime error using the error reporter for the current thread.
*
* @param message the error message to report
* @see org.mozilla.javascript.ErrorReporter
*/
public static EvaluatorException reportRuntimeError(String message)
{
int[] linep = { 0 };
String filename = getSourcePositionFromStack(linep);
return Context.reportRuntimeError(message, filename, linep[0], null, 0);
}
/**
* Initialize the standard objects.
*
* Creates instances of the standard objects and their constructors
* (Object, String, Number, Date, etc.), setting up 'scope' to act
* as a global object as in ECMA 15.1.
*
* This method must be called to initialize a scope before scripts
* can be evaluated in that scope.
*
* This method does not affect the Context it is called upon.
*
* @return the initialized scope
*/
public final ScriptableObject initStandardObjects()
{
return initStandardObjects(null, false);
}
/**
* Initialize the standard objects.
*
* Creates instances of the standard objects and their constructors
* (Object, String, Number, Date, etc.), setting up 'scope' to act
* as a global object as in ECMA 15.1.
*
* This method must be called to initialize a scope before scripts
* can be evaluated in that scope.
*
* This method does not affect the Context it is called upon.
*
* @param scope the scope to initialize, or null, in which case a new
* object will be created to serve as the scope
* @return the initialized scope. The method returns the value of the scope
* argument if it is not null or newly allocated scope object which
* is an instance {@link ScriptableObject}.
*/
public final Scriptable initStandardObjects(ScriptableObject scope)
{
return initStandardObjects(scope, false);
}
/**
* Initialize the standard objects.
*
* Creates instances of the standard objects and their constructors
* (Object, String, Number, Date, etc.), setting up 'scope' to act
* as a global object as in ECMA 15.1.
*
* This method must be called to initialize a scope before scripts
* can be evaluated in that scope.
*
* This method does not affect the Context it is called upon.
*
* This form of the method also allows for creating "sealed" standard
* objects. An object that is sealed cannot have properties added, changed,
* or removed. This is useful to create a "superglobal" that can be shared
* among several top-level objects. Note that sealing is not allowed in
* the current ECMA/ISO language specification, but is likely for
* the next version.
*
* @param scope the scope to initialize, or null, in which case a new
* object will be created to serve as the scope
* @param sealed whether or not to create sealed standard objects that
* cannot be modified.
* @return the initialized scope. The method returns the value of the scope
* argument if it is not null or newly allocated scope object.
* @since 1.4R3
*/
public ScriptableObject initStandardObjects(ScriptableObject scope,
boolean sealed)
{
return ScriptRuntime.initStandardObjects(this, scope, sealed);
}
/**
* Get the singleton object that represents the JavaScript Undefined value.
*/
public static Object getUndefinedValue()
{
return Undefined.instance;
}
/**
* Evaluate a JavaScript source string.
*
* The provided source name and line number are used for error messages
* and for producing debug information.
*
* @param scope the scope to execute in
* @param source the JavaScript source
* @param sourceName a string describing the source, such as a filename
* @param lineno the starting line number
* @param securityDomain an arbitrary object that specifies security
* information about the origin or owner of the script. For
* implementations that don't care about security, this value
* may be null.
* @return the result of evaluating the string
* @see org.mozilla.javascript.SecurityController
*/
public final Object evaluateString(Scriptable scope, String source,
String sourceName, int lineno,
Object securityDomain)
{
Script script = compileString(source, sourceName, lineno,
securityDomain);
if (script != null) {
return script.exec(this, scope);
} else {
return null;
}
}
/**
* Evaluate a reader as JavaScript source.
*
* All characters of the reader are consumed.
*
* @param scope the scope to execute in
* @param in the Reader to get JavaScript source from
* @param sourceName a string describing the source, such as a filename
* @param lineno the starting line number
* @param securityDomain an arbitrary object that specifies security
* information about the origin or owner of the script. For
* implementations that don't care about security, this value
* may be null.
* @return the result of evaluating the source
*
* @exception IOException if an IOException was generated by the Reader
*/
public final Object evaluateReader(Scriptable scope, Reader in,
String sourceName, int lineno,
Object securityDomain)
throws IOException
{
Script script = compileReader(scope, in, sourceName, lineno,
securityDomain);
if (script != null) {
return script.exec(this, scope);
} else {
return null;
}
}
/**
* Check whether a string is ready to be compiled.
*
* stringIsCompilableUnit is intended to support interactive compilation of
* javascript. If compiling the string would result in an error
* that might be fixed by appending more source, this method
* returns false. In every other case, it returns true.
*
* Interactive shells may accumulate source lines, using this
* method after each new line is appended to check whether the
* statement being entered is complete.
*
* @param source the source buffer to check
* @return whether the source is ready for compilation
* @since 1.4 Release 2
*/
public final boolean stringIsCompilableUnit(String source)
{
boolean errorseen = false;
CompilerEnvirons compilerEnv = new CompilerEnvirons();
compilerEnv.initFromContext(this);
// no source name or source text manager, because we're just
// going to throw away the result.
compilerEnv.setGeneratingSource(false);
Parser p = new Parser(compilerEnv, DefaultErrorReporter.instance);
try {
p.parse(source, null, 1);
} catch (EvaluatorException ee) {
errorseen = true;
}
// Return false only if an error occurred as a result of reading past
// the end of the file, i.e. if the source could be fixed by
// appending more source.
if (errorseen && p.eof())
return false;
else
return true;
}
/**
* @deprecated
* @see #compileReader(Reader in, String sourceName, int lineno,
* Object securityDomain)
*/
public final Script compileReader(Scriptable scope, Reader in,
String sourceName, int lineno,
Object securityDomain)
throws IOException
{
return compileReader(in, sourceName, lineno, securityDomain);
}
/**
* Compiles the source in the given reader.
*
* Returns a script that may later be executed.
* Will consume all the source in the reader.
*
* @param in the input reader
* @param sourceName a string describing the source, such as a filename
* @param lineno the starting line number for reporting errors
* @param securityDomain an arbitrary object that specifies security
* information about the origin or owner of the script. For
* implementations that don't care about security, this value
* may be null.
* @return a script that may later be executed
* @exception IOException if an IOException was generated by the Reader
* @see org.mozilla.javascript.Script
*/
public final Script compileReader(Reader in, String sourceName,
int lineno, Object securityDomain)
throws IOException
{
if (lineno < 0) {
// For compatibility IllegalArgumentException can not be thrown here
lineno = 0;
}
return (Script) compileImpl(null, in, null, sourceName, lineno,
securityDomain, false, null, null);
}
/**
* Compiles the source in the given string.
*
* Returns a script that may later be executed.
*
* @param source the source string
* @param sourceName a string describing the source, such as a filename
* @param lineno the starting line number for reporting errors
* @param securityDomain an arbitrary object that specifies security
* information about the origin or owner of the script. For
* implementations that don't care about security, this value
* may be null.
* @return a script that may later be executed
* @see org.mozilla.javascript.Script
*/
public final Script compileString(String source,
String sourceName, int lineno,
Object securityDomain)
{
if (lineno < 0) {
// For compatibility IllegalArgumentException can not be thrown here
lineno = 0;
}
return compileString(source, null, null, sourceName, lineno,
securityDomain);
}
final Script compileString(String source,
Interpreter compiler,
ErrorReporter compilationErrorReporter,
String sourceName, int lineno,
Object securityDomain)
{
try {
return (Script) compileImpl(null, null, source, sourceName, lineno,
securityDomain, false,
compiler, compilationErrorReporter);
} catch (IOException ex) {
// Should not happen when dealing with source as string
throw new RuntimeException();
}
}
/**
* Compile a JavaScript function.
*
* The function source must be a function definition as defined by
* ECMA (e.g., "function f(a) { return a; }").
*
* @param scope the scope to compile relative to
* @param source the function definition source
* @param sourceName a string describing the source, such as a filename
* @param lineno the starting line number
* @param securityDomain an arbitrary object that specifies security
* information about the origin or owner of the script. For
* implementations that don't care about security, this value
* may be null.
* @return a Function that may later be called
* @see org.mozilla.javascript.Function
*/
public final Function compileFunction(Scriptable scope, String source,
String sourceName, int lineno,
Object securityDomain)
{
return compileFunction(scope, source, null, null, sourceName, lineno,
securityDomain);
}
final Function compileFunction(Scriptable scope, String source,
Interpreter compiler,
ErrorReporter compilationErrorReporter,
String sourceName, int lineno,
Object securityDomain)
{
try {
return (Function) compileImpl(scope, null, source, sourceName,
lineno, securityDomain, true,
compiler, compilationErrorReporter);
}
catch (IOException ioe) {
// Should never happen because we just made the reader
// from a String
throw new RuntimeException();
}
}
/**
* Decompile the script.
*
* The canonical source of the script is returned.
*
* @param script the script to decompile
* @param indent the number of spaces to indent the result
* @return a string representing the script source
*/
public final String decompileScript(Script script, int indent)
{
NativeFunction scriptImpl = (NativeFunction) script;
return scriptImpl.decompile(indent, 0);
}
/**
* Decompile a JavaScript Function.
*
* Decompiles a previously compiled JavaScript function object to
* canonical source.
*
* Returns function body of '[native code]' if no decompilation
* information is available.
*
* @param fun the JavaScript function to decompile
* @param indent the number of spaces to indent the result
* @return a string representing the function source
*/
public final String decompileFunction(Function fun, int indent)
{
if (fun instanceof BaseFunction)
return ((BaseFunction)fun).decompile(indent, 0);
else
return "function " + fun.getClassName() +
"() {\n\t[native code]\n}\n";
}
/**
* Decompile the body of a JavaScript Function.
*
* Decompiles the body a previously compiled JavaScript Function
* object to canonical source, omitting the function header and
* trailing brace.
*
* Returns '[native code]' if no decompilation information is available.
*
* @param fun the JavaScript function to decompile
* @param indent the number of spaces to indent the result
* @return a string representing the function body source.
*/
public final String decompileFunctionBody(Function fun, int indent)
{
if (fun instanceof BaseFunction) {
BaseFunction bf = (BaseFunction)fun;
return bf.decompile(indent, Decompiler.ONLY_BODY_FLAG);
}
// ALERT: not sure what the right response here is.
return "[native code]\n";
}
/**
* Create a new JavaScript object.
*
* Equivalent to evaluating "new Object()".
* @param scope the scope to search for the constructor and to evaluate
* against
* @return the new object
*/
public final Scriptable newObject(Scriptable scope)
{
return newObject(scope, "Object", ScriptRuntime.emptyArgs);
}
/**
* Create a new JavaScript object by executing the named constructor.
*
* The call newObject(scope, "Foo") is equivalent to
* evaluating "new Foo()".
*
* @param scope the scope to search for the constructor and to evaluate against
* @param constructorName the name of the constructor to call
* @return the new object
*/
public final Scriptable newObject(Scriptable scope, String constructorName)
{
return newObject(scope, constructorName, ScriptRuntime.emptyArgs);
}
/**
* Creates a new JavaScript object by executing the named constructor.
*
* Searches scope for the named constructor, calls it with
* the given arguments, and returns the result.
*
* The code
*
* Object[] args = { "a", "b" };
* newObject(scope, "Foo", args)
* is equivalent to evaluating "new Foo('a', 'b')", assuming that the Foo
* constructor has been defined in scope.
*
* @param scope The scope to search for the constructor and to evaluate
* against
* @param constructorName the name of the constructor to call
* @param args the array of arguments for the constructor
* @return the new object
*/
public final Scriptable newObject(Scriptable scope, String constructorName,
Object[] args)
{
scope = ScriptableObject.getTopLevelScope(scope);
Function ctor = ScriptRuntime.getExistingCtor(this, scope,
constructorName);
if (args == null) { args = ScriptRuntime.emptyArgs; }
return ctor.construct(this, scope, args);
}
/**
* Create an array with a specified initial length.
*
* @param scope the scope to create the object in
* @param length the initial length (JavaScript arrays may have
* additional properties added dynamically).
* @return the new array object
*/
public final Scriptable newArray(Scriptable scope, int length)
{
NativeArray result = new NativeArray(length);
ScriptRuntime.setObjectProtoAndParent(result, scope);
return result;
}
/**
* Create an array with a set of initial elements.
*
* @param scope the scope to create the object in.
* @param elements the initial elements. Each object in this array
* must be an acceptable JavaScript type and type
* of array should be exactly Object[], not
* SomeObjectSubclass[].
* @return the new array object.
*/
public final Scriptable newArray(Scriptable scope, Object[] elements)
{
if (elements.getClass().getComponentType() != ScriptRuntime.ObjectClass)
throw new IllegalArgumentException();
NativeArray result = new NativeArray(elements);
ScriptRuntime.setObjectProtoAndParent(result, scope);
return result;
}
/**
* Get the elements of a JavaScript array.
*
* If the object defines a length property convertible to double number,
* then the number is converted Uint32 value as defined in Ecma 9.6
* and Java array of that size is allocated.
* The array is initialized with the values obtained by
* calling get() on object for each value of i in [0,length-1]. If
* there is not a defined value for a property the Undefined value
* is used to initialize the corresponding element in the array. The
* Java array is then returned.
* If the object doesn't define a length property or it is not a number,
* empty array is returned.
* @param object the JavaScript array or array-like object
* @return a Java array of objects
* @since 1.4 release 2
*/
public final Object[] getElements(Scriptable object)
{
return ScriptRuntime.getArrayElements(object);
}
/**
* Convert the value to a JavaScript boolean value.
*
* See ECMA 9.2.
*
* @param value a JavaScript value
* @return the corresponding boolean value converted using
* the ECMA rules
*/
public static boolean toBoolean(Object value)
{
return ScriptRuntime.toBoolean(value);
}
/**
* Convert the value to a JavaScript Number value.
*
* Returns a Java double for the JavaScript Number.
*
* See ECMA 9.3.
*
* @param value a JavaScript value
* @return the corresponding double value converted using
* the ECMA rules
*/
public static double toNumber(Object value)
{
return ScriptRuntime.toNumber(value);
}
/**
* Convert the value to a JavaScript String value.
*
* See ECMA 9.8.
*
* @param value a JavaScript value
* @return the corresponding String value converted using
* the ECMA rules
*/
public static String toString(Object value)
{
return ScriptRuntime.toString(value);
}
/**
* Convert the value to an JavaScript object value.
*
* Note that a scope must be provided to look up the constructors
* for Number, Boolean, and String.
*
* See ECMA 9.9.
*
* Additionally, arbitrary Java objects and classes will be
* wrapped in a Scriptable object with its Java fields and methods
* reflected as JavaScript properties of the object.
*
* @param value any Java object
* @param scope global scope containing constructors for Number,
* Boolean, and String
* @return new JavaScript object
*/
public static Scriptable toObject(Object value, Scriptable scope)
{
return ScriptRuntime.toObject(scope, value);
}
/**
* @deprecated
* @see #toObject(Object, Scriptable)
*/
public static Scriptable toObject(Object value, Scriptable scope,
Class staticType)
{
return ScriptRuntime.toObject(scope, value);
}
/**
* Convenient method to convert java value to its closest representation
* in JavaScript.
*
* If value is an instance of String, Number, Boolean, Function or
* Scriptable, it is returned as it and will be treated as the corresponding
* JavaScript type of string, number, boolean, function and object.
*
* Note that for Number instances during any arithmetic operation in
* JavaScript the engine will always use the result of
* Number.doubleValue() resulting in a precision loss if
* the number can not fit into double.
*
* If value is an instance of Character, it will be converted to string of
* length 1 and its JavaScript type will be string.
*
* The rest of values will be wrapped as LiveConnect objects
* by calling {@link WrapFactory#wrap(Context cx, Scriptable scope,
* Object obj, Class staticType)} as in:
*
* Context cx = Context.getCurrentContext();
* return cx.getWrapFactory().wrap(cx, scope, value, null);
*
*
* @param value any Java object
* @param scope top scope object
* @return value suitable to pass to any API that takes JavaScript values.
*/
public static Object javaToJS(Object value, Scriptable scope)
{
if (value instanceof String || value instanceof Number
|| value instanceof Boolean || value instanceof Scriptable)
{
return value;
} else if (value instanceof Character) {
return String.valueOf(((Character)value).charValue());
} else {
Context cx = Context.getContext();
return cx.getWrapFactory().wrap(cx, scope, value, null);
}
}
/**
* Convert a JavaScript value into the desired type.
* Uses the semantics defined with LiveConnect3 and throws an
* Illegal argument exception if the conversion cannot be performed.
* @param value the JavaScript value to convert
* @param desiredType the Java type to convert to. Primitive Java
* types are represented using the TYPE fields in the corresponding
* wrapper class in java.lang.
* @return the converted value
* @throws EvaluatorException if the conversion cannot be performed
*/
public static Object jsToJava(Object value, Class desiredType)
throws EvaluatorException
{
return NativeJavaObject.coerceTypeImpl(desiredType, value);
}
/**
* @deprecated
* @see #jsToJava(Object, Class)
* @throws IllegalArgumentException if the conversion cannot be performed.
* Note that {@link #jsToJava(Object, Class)} throws
* {@link EvaluatorException} instead.
*/
public static Object toType(Object value, Class desiredType)
throws IllegalArgumentException
{
try {
return jsToJava(value, desiredType);
} catch (EvaluatorException ex) {
IllegalArgumentException
ex2 = new IllegalArgumentException(ex.getMessage());
Kit.initCause(ex2, ex);
throw ex2;
}
}
/**
* Rethrow the exception wrapping it as the script runtime exception.
* Unless the exception is instance of {@link EcmaError} or
* {@link EvaluatorException} it will be wrapped as
* {@link WrappedException}, a subclass of {@link EvaluatorException}.
* The resulting exception object always contains
* source name and line number of script that triggered exception.
*
* This method always throws an exception, its return value is provided
* only for convenience to allow a usage like:
*
* throw Context.throwAsScriptRuntimeEx(ex);
*
* to indicate that code after the method is unreachable.
* @throws EvaluatorException
* @throws EcmaError
*/
public static RuntimeException throwAsScriptRuntimeEx(Throwable e)
{
while ((e instanceof InvocationTargetException)) {
e = ((InvocationTargetException) e).getTargetException();
}
// special handling of Error so scripts would not catch them
if (e instanceof Error) {
throw (Error)e;
}
if (e instanceof RhinoException) {
throw (RhinoException)e;
}
throw new WrappedException(e);
}
/**
* Tell whether debug information is being generated.
* @since 1.3
*/
public final boolean isGeneratingDebug()
{
return generatingDebug;
}
/**
* Specify whether or not debug information should be generated.
*
* Setting the generation of debug information on will set the
* optimization level to zero.
* @since 1.3
*/
public final void setGeneratingDebug(boolean generatingDebug)
{
if (sealed) onSealedMutation();
generatingDebugChanged = true;
if (generatingDebug && getOptimizationLevel() > 0)
setOptimizationLevel(0);
this.generatingDebug = generatingDebug;
}
/**
* Tell whether source information is being generated.
* @since 1.3
*/
public final boolean isGeneratingSource()
{
return generatingSource;
}
/**
* Specify whether or not source information should be generated.
*
* Without source information, evaluating the "toString" method
* on JavaScript functions produces only "[native code]" for
* the body of the function.
* Note that code generated without source is not fully ECMA
* conformant.
* @since 1.3
*/
public final void setGeneratingSource(boolean generatingSource)
{
if (sealed) onSealedMutation();
this.generatingSource = generatingSource;
}
/**
* Get the current optimization level.
*
* The optimization level is expressed as an integer between -1 and
* 9.
* @since 1.3
*
*/
public final int getOptimizationLevel()
{
return optimizationLevel;
}
/**
* Set the current optimization level.
*
* The optimization level is expected to be an integer between -1 and
* 9. Any negative values will be interpreted as -1, and any values
* greater than 9 will be interpreted as 9.
* An optimization level of -1 indicates that interpretive mode will
* always be used. Levels 0 through 9 indicate that class files may
* be generated. Higher optimization levels trade off compile time
* performance for runtime performance.
* The optimizer level can't be set greater than -1 if the optimizer
* package doesn't exist at run time.
* @param optimizationLevel an integer indicating the level of
* optimization to perform
* @since 1.3
*
*/
public final void setOptimizationLevel(int optimizationLevel)
{
if (sealed) onSealedMutation();
if (optimizationLevel == -2) {
// To be compatible with Cocoon fork
optimizationLevel = -1;
}
checkOptimizationLevel(optimizationLevel);
if (codegenClass == null)
optimizationLevel = -1;
this.optimizationLevel = optimizationLevel;
}
public static boolean isValidOptimizationLevel(int optimizationLevel)
{
return -1 <= optimizationLevel && optimizationLevel <= 9;
}
public static void checkOptimizationLevel(int optimizationLevel)
{
if (isValidOptimizationLevel(optimizationLevel)) {
return;
}
throw new IllegalArgumentException(
"Optimization level outside [-1..9]: "+optimizationLevel);
}
/**
* Returns the maximum stack depth (in terms of number of call frames)
* allowed in a single invocation of interpreter. If the set depth would be
* exceeded, the interpreter will throw an EvaluatorException in the script.
* Defaults to Integer.MAX_VALUE. The setting only has effect for
* interpreted functions (those compiled with optimization level set to -1).
* As the interpreter doesn't use the Java stack but rather manages its own
* stack in the heap memory, a runaway recursion in interpreted code would
* eventually consume all available memory and cause OutOfMemoryError
* instead of a StackOverflowError limited to only a single thread. This
* setting helps prevent such situations.
*
* @return The current maximum interpreter stack depth.
*/
public final int getMaximumInterpreterStackDepth()
{
return maximumInterpreterStackDepth;
}
/**
* Sets the maximum stack depth (in terms of number of call frames)
* allowed in a single invocation of interpreter. If the set depth would be
* exceeded, the interpreter will throw an EvaluatorException in the script.
* Defaults to Integer.MAX_VALUE. The setting only has effect for
* interpreted functions (those compiled with optimization level set to -1).
* As the interpreter doesn't use the Java stack but rather manages its own
* stack in the heap memory, a runaway recursion in interpreted code would
* eventually consume all available memory and cause OutOfMemoryError
* instead of a StackOverflowError limited to only a single thread. This
* setting helps prevent such situations.
*
* @param max the new maximum interpreter stack depth
* @throws IllegalStateException if this context's optimization level is not
* -1
* @throws IllegalArgumentException if the new depth is not at least 1
*/
public final void setMaximumInterpreterStackDepth(int max)
{
if(sealed) onSealedMutation();
if(optimizationLevel != -1) {
throw new IllegalStateException("Cannot set maximumInterpreterStackDepth when optimizationLevel != -1");
}
if(max < 1) {
throw new IllegalArgumentException("Cannot set maximumInterpreterStackDepth to less than 1");
}
maximumInterpreterStackDepth = max;
}
/**
* Set the security controller for this context.
*
SecurityController may only be set if it is currently null
* and {@link SecurityController#hasGlobal()} is false.
* Otherwise a SecurityException is thrown.
* @param controller a SecurityController object
* @throws SecurityException if there is already a SecurityController
* object for this Context or globally installed.
* @see SecurityController#initGlobal(SecurityController controller)
* @see SecurityController#hasGlobal()
*/
public final void setSecurityController(SecurityController controller)
{
if (sealed) onSealedMutation();
if (controller == null) throw new IllegalArgumentException();
if (securityController != null) {
throw new SecurityException("Can not overwrite existing SecurityController object");
}
if (SecurityController.hasGlobal()) {
throw new SecurityException("Can not overwrite existing global SecurityController object");
}
securityController = controller;
}
/**
* Set the LiveConnect access filter for this context.
*
{@link ClassShutter} may only be set if it is currently null.
* Otherwise a SecurityException is thrown.
* @param shutter a ClassShutter object
* @throws SecurityException if there is already a ClassShutter
* object for this Context
*/
public final void setClassShutter(ClassShutter shutter)
{
if (sealed) onSealedMutation();
if (shutter == null) throw new IllegalArgumentException();
if (classShutter != null) {
throw new SecurityException("Cannot overwrite existing " +
"ClassShutter object");
}
classShutter = shutter;
}
final ClassShutter getClassShutter()
{
return classShutter;
}
/**
* Get a value corresponding to a key.
*
* Since the Context is associated with a thread it can be
* used to maintain values that can be later retrieved using
* the current thread.
*
* Note that the values are maintained with the Context, so
* if the Context is disassociated from the thread the values
* cannot be retreived. Also, if private data is to be maintained
* in this manner the key should be a java.lang.Object
* whose reference is not divulged to untrusted code.
* @param key the key used to lookup the value
* @return a value previously stored using putThreadLocal.
*/
public final Object getThreadLocal(Object key)
{
if (hashtable == null)
return null;
return hashtable.get(key);
}
/**
* Put a value that can later be retrieved using a given key.
*
* @param key the key used to index the value
* @param value the value to save
*/
public final void putThreadLocal(Object key, Object value)
{
if (sealed) onSealedMutation();
if (hashtable == null)
hashtable = new Hashtable();
hashtable.put(key, value);
}
/**
* Remove values from thread-local storage.
* @param key the key for the entry to remove.
* @since 1.5 release 2
*/
public final void removeThreadLocal(Object key)
{
if (sealed) onSealedMutation();
if (hashtable == null)
return;
hashtable.remove(key);
}
/**
* @deprecated
* @see #FEATURE_DYNAMIC_SCOPE
* @see #hasFeature(int)
*/
public final boolean hasCompileFunctionsWithDynamicScope()
{
return compileFunctionsWithDynamicScopeFlag;
}
/**
* @deprecated
* @see #FEATURE_DYNAMIC_SCOPE
* @see #hasFeature(int)
*/
public final void setCompileFunctionsWithDynamicScope(boolean flag)
{
if (sealed) onSealedMutation();
compileFunctionsWithDynamicScopeFlag = flag;
}
/**
* @deprecated
* @see ClassCache#get(Scriptable)
* @see ClassCache#setCachingEnabled(boolean)
*/
public static void setCachingEnabled(boolean cachingEnabled)
{
}
/**
* Set a WrapFactory for this Context.
*
* The WrapFactory allows custom object wrapping behavior for
* Java object manipulated with JavaScript.
* @see WrapFactory
* @since 1.5 Release 4
*/
public final void setWrapFactory(WrapFactory wrapFactory)
{
if (sealed) onSealedMutation();
if (wrapFactory == null) throw new IllegalArgumentException();
this.wrapFactory = wrapFactory;
}
/**
* Return the current WrapFactory, or null if none is defined.
* @see WrapFactory
* @since 1.5 Release 4
*/
public final WrapFactory getWrapFactory()
{
if (wrapFactory == null) {
wrapFactory = new WrapFactory();
}
return wrapFactory;
}
/**
* Return the current debugger.
* @return the debugger, or null if none is attached.
*/
public final Debugger getDebugger()
{
return debugger;
}
/**
* Return the debugger context data associated with current context.
* @return the debugger data, or null if debugger is not attached
*/
public final Object getDebuggerContextData()
{
return debuggerData;
}
/**
* Set the associated debugger.
* @param debugger the debugger to be used on callbacks from
* the engine.
* @param contextData arbitrary object that debugger can use to store
* per Context data.
*/
public final void setDebugger(Debugger debugger, Object contextData)
{
if (sealed) onSealedMutation();
this.debugger = debugger;
debuggerData = contextData;
}
/**
* Return DebuggableScript instance if any associated with the script.
* If callable supports DebuggableScript implementation, the method
* returns it. Otherwise null is returned.
*/
public static DebuggableScript getDebuggableView(Script script)
{
if (script instanceof NativeFunction) {
return ((NativeFunction)script).getDebuggableView();
}
return null;
}
/**
* Controls certain aspects of script semantics.
* Should be overwritten to alter default behavior.
*
* The default implementation calls
* {@link ContextFactory#hasFeature(Context cx, int featureIndex)}
* that allows to customize Context behavior without introducing
* Context subclasses. {@link ContextFactory} documentation gives
* an example of hasFeature implementation.
*
* @param featureIndex feature index to check
* @return true if the featureIndex feature is turned on
* @see #FEATURE_NON_ECMA_GET_YEAR
* @see #FEATURE_MEMBER_EXPR_AS_FUNCTION_NAME
* @see #FEATURE_RESERVED_KEYWORD_AS_IDENTIFIER
* @see #FEATURE_TO_STRING_AS_SOURCE
* @see #FEATURE_PARENT_PROTO_PROPRTIES
* @see #FEATURE_E4X
* @see #FEATURE_DYNAMIC_SCOPE
* @see #FEATURE_STRICT_VARS
* @see #FEATURE_STRICT_EVAL
*/
public boolean hasFeature(int featureIndex)
{
ContextFactory f = getFactory();
return f.hasFeature(this, featureIndex);
}
/**
* Get/Set threshold of executed instructions counter that triggers call to
* observeInstructionCount().
* When the threshold is zero, instruction counting is disabled,
* otherwise each time the run-time executes at least the threshold value
* of script instructions, observeInstructionCount() will
* be called.
*/
public final int getInstructionObserverThreshold()
{
return instructionThreshold;
}
public final void setInstructionObserverThreshold(int threshold)
{
if (sealed) onSealedMutation();
if (threshold < 0) throw new IllegalArgumentException();
instructionThreshold = threshold;
}
/**
* Allow application to monitor counter of executed script instructions
* in Context subclasses.
* Run-time calls this when instruction counting is enabled and the counter
* reaches limit set by setInstructionObserverThreshold().
* The method is useful to observe long running scripts and if necessary
* to terminate them.
*
* The instruction counting support is available only for interpreted
* scripts generated when the optimization level is set to -1.
*
* The default implementation calls
* {@link ContextFactory#observeInstructionCount(Context cx,
* int instructionCount)}
* that allows to customize Context behavior without introducing
* Context subclasses.
*
* @param instructionCount amount of script instruction executed since
* last call to observeInstructionCount
* @throws Error to terminate the script
* @see #setOptimizationLevel(int)
*/
protected void observeInstructionCount(int instructionCount)
{
ContextFactory f = getFactory();
f.observeInstructionCount(this, instructionCount);
}
/**
* Create class loader for generated classes.
* The method calls {@link ContextFactory#createClassLoader(ClassLoader)}
* using the result of {@link #getFactory()}.
*/
public GeneratedClassLoader createClassLoader(ClassLoader parent)
{
ContextFactory f = getFactory();
return f.createClassLoader(parent);
}
public final ClassLoader getApplicationClassLoader()
{
if (applicationClassLoader == null) {
ContextFactory f = getFactory();
ClassLoader loader = f.getApplicationClassLoader();
if (loader == null) {
ClassLoader threadLoader
= VMBridge.instance.getCurrentThreadClassLoader();
if (threadLoader != null
&& Kit.testIfCanLoadRhinoClasses(threadLoader))
{
// Thread.getContextClassLoader is not cached since
// its caching prevents it from GC which may lead to
// a memory leak and hides updates to
// Thread.getContextClassLoader
return threadLoader;
}
// Thread.getContextClassLoader can not load Rhino classes,
// try to use the loader of ContextFactory or Context
// subclasses.
Class fClass = f.getClass();
if (fClass != ScriptRuntime.ContextFactoryClass) {
loader = fClass.getClassLoader();
} else {
loader = getClass().getClassLoader();
}
}
applicationClassLoader = loader;
}
return applicationClassLoader;
}
public final void setApplicationClassLoader(ClassLoader loader)
{
if (sealed) onSealedMutation();
if (loader == null) {
// restore default behaviour
applicationClassLoader = null;
return;
}
if (!Kit.testIfCanLoadRhinoClasses(loader)) {
throw new IllegalArgumentException(
"Loader can not resolve Rhino classes");
}
applicationClassLoader = loader;
}
/********** end of API **********/
/**
* Internal method that reports an error for missing calls to
* enter().
*/
static Context getContext()
{
Context cx = getCurrentContext();
if (cx == null) {
throw new RuntimeException(
"No Context associated with current Thread");
}
return cx;
}
private Object compileImpl(Scriptable scope,
Reader sourceReader, String sourceString,
String sourceName, int lineno,
Object securityDomain, boolean returnFunction,
Interpreter compiler,
ErrorReporter compilationErrorReporter)
throws IOException
{
if (securityDomain != null && securityController == null) {
throw new IllegalArgumentException(
"securityDomain should be null if setSecurityController() was never called");
}
// One of sourceReader or sourceString has to be null
if (!(sourceReader == null ^ sourceString == null)) Kit.codeBug();
// scope should be given if and only if compiling function
if (!(scope == null ^ returnFunction)) Kit.codeBug();
CompilerEnvirons compilerEnv = new CompilerEnvirons();
compilerEnv.initFromContext(this);
if (compilationErrorReporter == null) {
compilationErrorReporter = compilerEnv.getErrorReporter();
}
if (debugger != null) {
if (sourceReader != null) {
sourceString = Kit.readReader(sourceReader);
sourceReader = null;
}
}
Parser p = new Parser(compilerEnv, compilationErrorReporter);
if (returnFunction) {
p.calledByCompileFunction = true;
}
ScriptOrFnNode tree;
if (sourceString != null) {
tree = p.parse(sourceString, sourceName, lineno);
} else {
tree = p.parse(sourceReader, sourceName, lineno);
}
if (returnFunction) {
if (!(tree.getFunctionCount() == 1
&& tree.getFirstChild() != null
&& tree.getFirstChild().getType() == Token.FUNCTION))
{
// XXX: the check just look for the first child
// and allows for more nodes after it for compatibility
// with sources like function() {};;;
throw new IllegalArgumentException(
"compileFunction only accepts source with single JS function: "+sourceString);
}
}
if (compiler == null) {
compiler = createCompiler();
}
String encodedSource = p.getEncodedSource();
Object bytecode = compiler.compile(compilerEnv,
tree, encodedSource,
returnFunction);
if (debugger != null) {
if (sourceString == null) Kit.codeBug();
if (bytecode instanceof DebuggableScript) {
DebuggableScript dscript = (DebuggableScript)bytecode;
notifyDebugger_r(this, dscript, sourceString);
} else {
throw new RuntimeException("NOT SUPPORTED");
}
}
Object result;
if (returnFunction) {
result = compiler.createFunctionObject(this, scope, bytecode,
securityDomain);
} else {
result = compiler.createScriptObject(bytecode, securityDomain);
}
return result;
}
private static void notifyDebugger_r(Context cx, DebuggableScript dscript,
String debugSource)
{
cx.debugger.handleCompilationDone(cx, dscript, debugSource);
for (int i = 0; i != dscript.getFunctionCount(); ++i) {
notifyDebugger_r(cx, dscript.getFunction(i), debugSource);
}
}
private static Class codegenClass = Kit.classOrNull(
"org.mozilla.javascript.optimizer.Codegen");
private Interpreter createCompiler()
{
Interpreter result = null;
if (optimizationLevel >= 0 && codegenClass != null) {
result = (Interpreter)Kit.newInstanceOrNull(codegenClass);
}
if (result == null) {
result = new Interpreter();
}
return result;
}
static String getSourcePositionFromStack(int[] linep)
{
Context cx = getCurrentContext();
if (cx == null)
return null;
if (cx.lastInterpreterFrame != null) {
return Interpreter.getSourcePositionFromStack(cx, linep);
}
/**
* A bit of a hack, but the only way to get filename and line
* number from an enclosing frame.
*/
CharArrayWriter writer = new CharArrayWriter();
RuntimeException re = new RuntimeException();
re.printStackTrace(new PrintWriter(writer));
String s = writer.toString();
int open = -1;
int close = -1;
int colon = -1;
for (int i=0; i < s.length(); i++) {
char c = s.charAt(i);
if (c == ':')
colon = i;
else if (c == '(')
open = i;
else if (c == ')')
close = i;
else if (c == '\n' && open != -1 && close != -1 && colon != -1 &&
open < colon && colon < close)
{
String fileStr = s.substring(open + 1, colon);
if (!fileStr.endsWith(".java")) {
String lineStr = s.substring(colon + 1, close);
try {
linep[0] = Integer.parseInt(lineStr);
if (linep[0] < 0) {
linep[0] = 0;
}
return fileStr;
}
catch (NumberFormatException e) {
// fall through
}
}
open = close = colon = -1;
}
}
return null;
}
RegExpProxy getRegExpProxy()
{
if (regExpProxy == null) {
Class cl = Kit.classOrNull(
"org.mozilla.javascript.regexp.RegExpImpl");
if (cl != null) {
regExpProxy = (RegExpProxy)Kit.newInstanceOrNull(cl);
}
}
return regExpProxy;
}
final boolean isVersionECMA1()
{
return version == VERSION_DEFAULT || version >= VERSION_1_3;
}
// The method must NOT be public or protected
SecurityController getSecurityController()
{
SecurityController global = SecurityController.global();
if (global != null) {
return global;
}
return securityController;
}
public final boolean isGeneratingDebugChanged()
{
return generatingDebugChanged;
}
/**
* Add a name to the list of names forcing the creation of real
* activation objects for functions.
*
* @param name the name of the object to add to the list
*/
public void addActivationName(String name)
{
if (sealed) onSealedMutation();
if (activationNames == null)
activationNames = new Hashtable(5);
activationNames.put(name, name);
}
/**
* Check whether the name is in the list of names of objects
* forcing the creation of activation objects.
*
* @param name the name of the object to test
*
* @return true if an function activation object is needed.
*/
public final boolean isActivationNeeded(String name)
{
return activationNames != null && activationNames.containsKey(name);
}
/**
* Remove a name from the list of names forcing the creation of real
* activation objects for functions.
*
* @param name the name of the object to remove from the list
*/
public void removeActivationName(String name)
{
if (sealed) onSealedMutation();
if (activationNames != null)
activationNames.remove(name);
}
private static String implementationVersion;
private ContextFactory factory;
private boolean sealed;
private Object sealKey;
Scriptable topCallScope;
NativeCall currentActivationCall;
XMLLib cachedXMLLib;
// for Objects, Arrays to tag themselves as being printed out,
// so they don't print themselves out recursively.
// Use ObjToIntMap instead of java.util.HashSet for JDK 1.1 compatibility
ObjToIntMap iterating;
Object interpreterSecurityDomain;
int version;
private SecurityController securityController;
private ClassShutter classShutter;
private ErrorReporter errorReporter;
RegExpProxy regExpProxy;
private Locale locale;
private boolean generatingDebug;
private boolean generatingDebugChanged;
private boolean generatingSource=true;
boolean compileFunctionsWithDynamicScopeFlag;
boolean useDynamicScope;
private int optimizationLevel;
private int maximumInterpreterStackDepth;
private WrapFactory wrapFactory;
Debugger debugger;
private Object debuggerData;
private int enterCount;
private Object propertyListeners;
private Hashtable hashtable;
private ClassLoader applicationClassLoader;
private boolean creationEventWasSent;
/**
* This is the list of names of objects forcing the creation of
* function activation records.
*/
Hashtable activationNames;
// For the interpreter to store the last frame for error reports etc.
Object lastInterpreterFrame;
// For the interpreter to store information about previous invocations
// interpreter invocations
ObjArray previousInterpreterInvocations;
// For instruction counting (interpreter only)
int instructionCount;
int instructionThreshold;
// It can be used to return the second index-like result from function
int scratchIndex;
// It can be used to return the second uint32 result from function
long scratchUint32;
// It can be used to return the second Scriptable result from function
Scriptable scratchScriptable;
}