* * 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; /** * 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 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; /** * 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 behaviour 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; /** * Create a new Context. * * Note that the Context must be associated with a thread before * it can be used to execute a script. * @deprecated use {@link ContextFactory#enter()} or * {@link ContextFactory#call(ContextAction)} instead. */ public Context() { this(ContextFactory.getGlobal()); } Context(ContextFactory factory) { assert factory != null; this.factory = factory; 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 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. * @deprecated use {@link ContextFactory#enter()} or * {@link ContextFactory#call(ContextAction)} instead as this method relies * on usage of a static singleton "global" ContextFactory. * @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 {@links 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(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. */ 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, 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: case VERSION_1_7: 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; } } /** * 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); /*APPJET*/ Parser p = InformativeParser.makeParser(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, 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 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) {
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 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 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 (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
* @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.
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 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,
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;
}
}
/*APPJET*/
Parser p = InformativeParser.makeParser(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 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.
*/
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 final 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;
/**
* 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;
// Generate an observer count on compiled code
public boolean generateObserverCount = false;
}