org.mozilla.javascript.Context Maven / Gradle / Ivy
Show all versions of rhino Show documentation
/* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
// API class
package org.mozilla.javascript;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.Reader;
import java.io.StringWriter;
import java.io.Writer;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Map;
import java.util.HashMap;
import java.util.Set;
import java.util.HashSet;
import java.util.Locale;
import org.mozilla.javascript.ast.AstRoot;
import org.mozilla.javascript.ast.ScriptNode;
import org.mozilla.javascript.debug.DebuggableScript;
import org.mozilla.javascript.debug.Debugger;
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 1.6
*/
public static final int VERSION_1_6 = 160;
/**
* JavaScript 1.7
*/
public static final int VERSION_1_7 = 170;
/**
* JavaScript 1.8
*/
public static final int VERSION_1_8 = 180;
/**
* 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_PROPERTIES) 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_PROPERTIES = 5;
/**
* @deprecated In previous releases, this name was given to
* FEATURE_PARENT_PROTO_PROPERTIES.
*/
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 at least {@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 create a 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;
/**
* When the feature is on Rhino will add a "fileName" and "lineNumber"
* properties to Error objects automatically. When the feature is off, you
* have to explicitly pass them as the second and third argument to the
* Error constructor. Note that neither behavior is fully ECMA 262
* compliant (as 262 doesn't specify a three-arg constructor), but keeping
* the feature off results in Error objects that don't have
* additional non-ECMA properties when constructed using the ECMA-defined
* single-arg constructor and is thus desirable if a stricter ECMA
* compliance is desired, specifically adherence to the point 15.11.5. of
* the standard.
*
* By default {@link #hasFeature(int)} returns false.
* @since 1.6 Release 6
*/
public static final int FEATURE_LOCATION_INFORMATION_IN_ERROR = 10;
/**
* Controls whether JS 1.5 'strict mode' is enabled.
* When the feature is on, Rhino reports more than a dozen different
* warnings. When the feature is off, these warnings are not generated.
* FEATURE_STRICT_MODE implies FEATURE_STRICT_VARS and FEATURE_STRICT_EVAL.
*
* By default {@link #hasFeature(int)} returns false.
* @since 1.6 Release 6
*/
public static final int FEATURE_STRICT_MODE = 11;
/**
* Controls whether a warning should be treated as an error.
* @since 1.6 Release 6
*/
public static final int FEATURE_WARNING_AS_ERROR = 12;
/**
* Enables enhanced access to Java.
* Specifically, controls whether private and protected members can be
* accessed, and whether scripts can catch all Java exceptions.
*
* Note that this feature should only be enabled for trusted scripts.
*
* By default {@link #hasFeature(int)} returns false.
* @since 1.7 Release 1
*/
public static final int FEATURE_ENHANCED_JAVA_ACCESS = 13;
public static final String languageVersionProperty = "language version";
public static final String errorReporterProperty = "error reporter";
/**
* Convenient value to use as zero-length array of objects.
*/
public static final Object[] emptyArgs = ScriptRuntime.emptyArgs;
/**
* Creates a new Context. The context will be associated with the {@link
* ContextFactory#getGlobal() global context factory}.
*
* Note that the Context must be associated with a thread before
* it can be used to execute a script.
* @deprecated this constructor is deprecated because it creates a
* dependency on a static singleton context factory. Use
* {@link ContextFactory#enter()} or
* {@link ContextFactory#call(ContextAction)} instead. If you subclass
* this class, consider using {@link #Context(ContextFactory)} constructor
* instead in the subclasses' constructors.
*/
public Context()
{
this(ContextFactory.getGlobal());
}
/**
* Creates a new context. Provided as a preferred super constructor for
* subclasses in place of the deprecated default public constructor.
* @param factory the context factory associated with this context (most
* likely, the one that created the context). Can not be null. The context
* features are inherited from the factory, and the context will also
* otherwise use its factory's services.
* @throws IllegalArgumentException if factory parameter is null.
*/
protected Context(ContextFactory factory)
{
if(factory == null) {
throw new IllegalArgumentException("factory == null");
}
this.factory = factory;
version = 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 ContextFactory#enterContext()
* @see ContextFactory#call(ContextAction)
*/
public static Context getCurrentContext()
{
Object helper = VMBridge.instance.getThreadContextHelper();
return VMBridge.instance.getContext(helper);
}
/**
* Same as calling {@link ContextFactory#enterContext()} on the global
* ContextFactory instance.
* @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
* @deprecated use {@link ContextFactory#enterContext(Context)} instead as
* this method relies on usage of a static singleton "global" ContextFactory.
* @see ContextFactory#enterContext(Context)
* @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) {
cx = old;
} else {
if (cx == null) {
cx = factory.makeContext();
if (cx.enterCount != 0) {
throw new IllegalStateException("factory.makeContext() returned Context instance already associated with some thread");
}
factory.onContextCreated(cx);
if (factory.isSealed() && !cx.isSealed()) {
cx.seal(null);
}
} else {
if (cx.enterCount != 0) {
throw new IllegalStateException("can not use Context instance already associated with some thread");
}
}
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
* {@link ContextFactory#enterContext()} 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 ContextFactory#enterContext()
*/
public static void exit()
{
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.enterCount < 1) Kit.codeBug();
if (--cx.enterCount == 0) {
VMBridge.instance.setContext(helper, null);
cx.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)}.
* @deprecated use {@link ContextFactory#call(ContextAction)} instead as
* this method relies on usage of a static singleton "global"
* ContextFactory.
* @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 but not advisable to use null for factory
* argument in which case the global static singleton ContextFactory
* instance will be used to create new context instances.
* @see ContextFactory#call(ContextAction)
*/
public static Object call(ContextFactory factory, final Callable callable,
final Scriptable scope, final Scriptable thisObj,
final Object[] args)
{
if(factory == null) {
factory = ContextFactory.getGlobal();
}
return call(factory, new ContextAction() {
public Object run(Context cx) {
return callable.call(cx, scope, thisObj, args);
}
});
}
/**
* The method implements {@link ContextFactory#call(ContextAction)} logic.
*/
static Object call(ContextFactory factory, ContextAction action) {
Context cx = enter(null, factory);
try {
return action.run(cx);
}
finally {
exit();
}
}
/**
* @deprecated
* @see ContextFactory#addListener(org.mozilla.javascript.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(org.mozilla.javascript.ContextFactory.Listener)
* @see ContextFactory#getGlobal()
*/
public static void removeContextListener(ContextListener listener)
{
ContextFactory.getGlobal().addListener(listener);
}
/**
* Return {@link ContextFactory} instance used to create this Context.
*/
public final ContextFactory getFactory()
{
return factory;
}
/**
* 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,
Integer.valueOf(this.version),
Integer.valueOf(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:
case VERSION_1_7:
case VERSION_1_8:
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 newValue 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();
if (cx.hasFeature(FEATURE_WARNING_AS_ERROR))
reportError(message, sourceName, lineno, lineSource, lineOffset);
else
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);
}
public static void reportWarning(String message, Throwable t)
{
int[] linep = { 0 };
String filename = getSourcePositionFromStack(linep);
Writer sw = new StringWriter();
PrintWriter pw = new PrintWriter(sw);
pw.println(message);
t.printStackTrace(pw);
pw.flush();
Context.reportWarning(sw.toString(), 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;
}
}
/**
* Execute script that may pause execution by capturing a continuation.
* Caller must be prepared to catch a ContinuationPending exception
* and resume execution by calling
* {@link #resumeContinuation(Object, Scriptable, Object)}.
* @param script The script to execute. Script must have been compiled
* with interpreted mode (optimization level -1)
* @param scope The scope to execute the script against
* @throws ContinuationPending if the script calls a function that results
* in a call to {@link #captureContinuation()}
* @since 1.7 Release 2
*/
public Object executeScriptWithContinuations(Script script,
Scriptable scope)
throws ContinuationPending
{
if (!(script instanceof InterpretedFunction) ||
!((InterpretedFunction)script).isScript())
{
// Can only be applied to scripts
throw new IllegalArgumentException("Script argument was not" +
" a script or was not created by interpreted mode ");
}
return callFunctionWithContinuations((InterpretedFunction) script,
scope, ScriptRuntime.emptyArgs);
}
/**
* Call function that may pause execution by capturing a continuation.
* Caller must be prepared to catch a ContinuationPending exception
* and resume execution by calling
* {@link #resumeContinuation(Object, Scriptable, Object)}.
* @param function The function to call. The function must have been
* compiled with interpreted mode (optimization level -1)
* @param scope The scope to execute the script against
* @param args The arguments for the function
* @throws ContinuationPending if the script calls a function that results
* in a call to {@link #captureContinuation()}
* @since 1.7 Release 2
*/
public Object callFunctionWithContinuations(Callable function,
Scriptable scope, Object[] args)
throws ContinuationPending
{
if (!(function instanceof InterpretedFunction)) {
// Can only be applied to scripts
throw new IllegalArgumentException("Function argument was not" +
" created by interpreted mode ");
}
if (ScriptRuntime.hasTopCall(this)) {
throw new IllegalStateException("Cannot have any pending top " +
"calls when executing a script with continuations");
}
// Annotate so we can check later to ensure no java code in
// intervening frames
isContinuationsTopCall = true;
return ScriptRuntime.doTopCall(function, this, scope, scope, args);
}
/**
* Capture a continuation from the current execution. The execution must
* have been started via a call to
* {@link #executeScriptWithContinuations(Script, Scriptable)} or
* {@link #callFunctionWithContinuations(Callable, Scriptable, Object[])}.
* This implies that the code calling
* this method must have been called as a function from the
* JavaScript script. Also, there cannot be any non-JavaScript code
* between the JavaScript frames (e.g., a call to eval()). The
* ContinuationPending exception returned must be thrown.
* @return A ContinuationPending exception that must be thrown
* @since 1.7 Release 2
*/
public ContinuationPending captureContinuation() {
return new ContinuationPending(
Interpreter.captureContinuation(this));
}
/**
* Restarts execution of the JavaScript suspended at the call
* to {@link #captureContinuation()}. Execution of the code will resume
* with the functionResult as the result of the call that captured the
* continuation.
* Execution of the script will either conclude normally and the
* result returned, another continuation will be captured and
* thrown, or the script will terminate abnormally and throw an exception.
* @param continuation The value returned by
* {@link ContinuationPending#getContinuation()}
* @param functionResult This value will appear to the code being resumed
* as the result of the function that captured the continuation
* @throws ContinuationPending if another continuation is captured before
* the code terminates
* @since 1.7 Release 2
*/
public Object resumeContinuation(Object continuation,
Scriptable scope, Object functionResult)
throws ContinuationPending
{
Object[] args = { functionResult };
return Interpreter.restartContinuation(
(org.mozilla.javascript.NativeContinuation) continuation,
this, scope, args);
}
/**
* 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. Use
* 0 if the line number is unknown.
* @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,
Evaluator 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,
Evaluator 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 Scriptable newObject(Scriptable scope)
{
NativeObject result = new NativeObject();
ScriptRuntime.setBuiltinProtoAndParent(result, scope,
TopLevel.Builtins.Object);
return result;
}
/**
* 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 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 Scriptable newObject(Scriptable scope, String constructorName,
Object[] args)
{
return ScriptRuntime.newObject(this, scope, constructorName, 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 Scriptable newArray(Scriptable scope, int length)
{
NativeArray result = new NativeArray(length);
ScriptRuntime.setBuiltinProtoAndParent(result, scope,
TopLevel.Builtins.Array);
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 Scriptable newArray(Scriptable scope, Object[] elements)
{
if (elements.getClass().getComponentType() != ScriptRuntime.ObjectClass)
throw new IllegalArgumentException();
NativeArray result = new NativeArray(elements);
ScriptRuntime.setBuiltinProtoAndParent(result, scope,
TopLevel.Builtins.Array);
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) {
Context cx = getContext();
if (cx == null ||
!cx.hasFeature(Context.FEATURE_ENHANCED_JAVA_ACCESS))
{
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 synchronized final void setClassShutter(ClassShutter shutter)
{
if (sealed) onSealedMutation();
if (shutter == null) throw new IllegalArgumentException();
if (hasClassShutter) {
throw new SecurityException("Cannot overwrite existing " +
"ClassShutter object");
}
classShutter = shutter;
hasClassShutter = true;
}
final synchronized ClassShutter getClassShutter()
{
return classShutter;
}
public interface ClassShutterSetter {
public void setClassShutter(ClassShutter shutter);
public ClassShutter getClassShutter();
}
public final synchronized ClassShutterSetter getClassShutterSetter() {
if (hasClassShutter)
return null;
hasClassShutter = true;
return new ClassShutterSetter() {
public void setClassShutter(ClassShutter shutter) {
classShutter = shutter;
}
public 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 retrieved. 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 (threadLocalMap == null)
return null;
return threadLocalMap.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 synchronized final void putThreadLocal(Object key, Object value)
{
if (sealed) onSealedMutation();
if (threadLocalMap == null)
threadLocalMap = new HashMap();
threadLocalMap.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 (threadLocalMap == null)
return;
threadLocalMap.remove(key);
}
/**
* @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
* @see #FEATURE_LOCATION_INFORMATION_IN_ERROR
* @see #FEATURE_STRICT_MODE
* @see #FEATURE_WARNING_AS_ERROR
* @see #FEATURE_ENHANCED_JAVA_ACCESS
*/
public boolean hasFeature(int featureIndex)
{
ContextFactory f = getFactory();
return f.hasFeature(this, featureIndex);
}
/**
* Returns an object which specifies an E4X implementation to use within
* this Context. Note that the XMLLib.Factory interface should
* be considered experimental.
*
* The default implementation uses the implementation provided by this
* Context's {@link ContextFactory}.
*
* @return An XMLLib.Factory. Should not return null if
* {@link #FEATURE_E4X} is enabled. See {@link #hasFeature}.
*/
public XMLLib.Factory getE4xImplementationFactory() {
return getFactory().getE4xImplementationFactory();
}
/**
* Get 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;
}
/**
* 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.
* Note that the meaning of "instruction" is not guaranteed to be
* consistent between compiled and interpretive modes: executing a given
* script or function in the different modes will result in different
* instruction counts against the threshold.
* {@link #setGenerateObserverCount} is called with true if
* threshold is greater than zero, false otherwise.
* @param threshold The instruction threshold
*/
public final void setInstructionObserverThreshold(int threshold)
{
if (sealed) onSealedMutation();
if (threshold < 0) throw new IllegalArgumentException();
instructionThreshold = threshold;
setGenerateObserverCount(threshold > 0);
}
/**
* Turn on or off generation of code with callbacks to
* track the count of executed instructions.
* Currently only affects JVM byte code generation: this slows down the
* generated code, but code generated without the callbacks will not
* be counted toward instruction thresholds. Rhino's interpretive
* mode does instruction counting without inserting callbacks, so
* there is no requirement to compile code differently.
* @param generateObserverCount if true, generated code will contain
* calls to accumulate an estimate of the instructions executed.
*/
public void setGenerateObserverCount(boolean generateObserverCount) {
this.generateObserverCount = generateObserverCount;
}
/**
* 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 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,
Evaluator compiler,
ErrorReporter compilationErrorReporter)
throws IOException
{
if(sourceName == null) {
sourceName = "unnamed script";
}
if (securityDomain != null && getSecurityController() == 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;
}
AstRoot ast;
if (sourceString != null) {
ast = p.parse(sourceString, sourceName, lineno);
} else {
ast = p.parse(sourceReader, sourceName, lineno);
}
if (returnFunction) {
// parser no longer adds function to script node
if (!(ast.getFirstChild() != null
&& ast.getFirstChild().getType() == Token.FUNCTION))
{
// XXX: the check just looks 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);
}
}
IRFactory irf = new IRFactory(compilerEnv, compilationErrorReporter);
ScriptNode tree = irf.transformTree(ast);
// discard everything but the IR tree
p = null;
ast = null;
irf = null;
if (compiler == null) {
compiler = createCompiler();
}
Object bytecode = compiler.compile(compilerEnv,
tree, tree.getEncodedSource(),
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 static Class interpreterClass = Kit.classOrNull(
"org.mozilla.javascript.Interpreter");
private Evaluator createCompiler()
{
Evaluator result = null;
if (optimizationLevel >= 0 && codegenClass != null) {
result = (Evaluator)Kit.newInstanceOrNull(codegenClass);
}
if (result == null) {
result = createInterpreter();
}
return result;
}
static Evaluator createInterpreter()
{
return (Evaluator)Kit.newInstanceOrNull(interpreterClass);
}
static String getSourcePositionFromStack(int[] linep)
{
Context cx = getCurrentContext();
if (cx == null)
return null;
if (cx.lastInterpreterFrame != null) {
Evaluator evaluator = createInterpreter();
if (evaluator != null)
return evaluator.getSourcePositionFromStack(cx, linep);
}
/**
* A bit of a hack, but the only way to get filename and line
* number from an enclosing frame.
*/
StackTraceElement[] stackTrace = new Throwable().getStackTrace();
for (StackTraceElement st : stackTrace) {
String file = st.getFileName();
if (!(file == null || file.endsWith(".java"))) {
int line = st.getLineNumber();
if (line >= 0) {
linep[0] = line;
return file;
}
}
}
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 HashSet();
activationNames.add(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.contains(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 final ContextFactory factory;
private boolean sealed;
private Object sealKey;
Scriptable topCallScope;
boolean isContinuationsTopCall;
NativeCall currentActivationCall;
XMLLib cachedXMLLib;
BaseFunction typeErrorThrower;
// 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 boolean hasClassShutter;
private ClassShutter classShutter;
private ErrorReporter errorReporter;
RegExpProxy regExpProxy;
private Locale locale;
private boolean generatingDebug;
private boolean generatingDebugChanged;
private boolean generatingSource=true;
boolean useDynamicScope;
private int optimizationLevel;
private int maximumInterpreterStackDepth;
private WrapFactory wrapFactory;
Debugger debugger;
private Object debuggerData;
private int enterCount;
private Object propertyListeners;
private Map threadLocalMap;
private ClassLoader applicationClassLoader;
/**
* This is the list of names of objects forcing the creation of
* function activation records.
*/
Set 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;
// Generate an observer count on compiled code
public boolean generateObserverCount = false;
}