/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ /* ***** BEGIN LICENSE BLOCK ***** * Version: MPL 1.1/GPL 2.0/LGPL 2.1 * * The contents of this file are subject to the Mozilla Public License Version * 1.1 (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * http://www.mozilla.org/MPL/ * * Software distributed under the License is distributed on an "AS IS" basis, * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License * for the specific language governing rights and limitations under the * License. * * The Original Code is mozilla.org code. * * The Initial Developer of the Original Code is * Netscape Communications Corporation. * Portions created by the Initial Developer are Copyright (C) 1998-1999 * the Initial Developer. All Rights Reserved. * * Contributor(s): * * Alternatively, the contents of this file may be used under the terms of * either of the GNU General Public License Version 2 or later (the "GPL"), * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), * in which case the provisions of the GPL or the LGPL are applicable instead * of those above. If you wish to allow use of your version of this file only * under the terms of either the GPL or the LGPL, and not to allow others to * use your version of this file under the terms of the MPL, indicate your * decision by deleting the provisions above and replace them with the notice * and other provisions required by the GPL or the LGPL. If you do not delete * the provisions above, a recipient may use your version of this file under * the terms of any one of the MPL, the GPL or the LGPL. * * ***** END LICENSE BLOCK ***** */ #ifndef nsIScriptContext_h__ #define nsIScriptContext_h__ #include "nscore.h" #include "nsStringGlue.h" #include "nsISupports.h" #include "nsCOMPtr.h" #include "nsIProgrammingLanguage.h" class nsIScriptGlobalObject; class nsIScriptSecurityManager; class nsIPrincipal; class nsIAtom; class nsIArray; class nsIVariant; class nsIObjectInputStream; class nsIObjectOutputStream; class nsScriptObjectHolder; typedef void (*nsScriptTerminationFunc)(nsISupports* aRef); #define NS_ISCRIPTCONTEXT_IID \ { /* {09316a0e-8d05-4d26-9efd-8f907a7c79d2} */ \ 0x09316a0e, 0x8d05, 0x4d26, \ { 0x9e, 0xfd, 0x8f, 0x90, 0x7a, 0x7c, 0x79, 0xd2 } } /* This MUST match JSVERSION_DEFAULT. This version stuff if we don't know what language we have is a little silly... */ #define SCRIPTVERSION_DEFAULT JSVERSION_DEFAULT /** * It is used by the application to initialize a runtime and run scripts. * A script runtime would implement this interface. *

It does have a bit too much java script information now, that * should be removed in a short time. Ideally this interface will be * language neutral */ class nsIScriptContext : public nsISupports { public: NS_DECLARE_STATIC_IID_ACCESSOR(NS_ISCRIPTCONTEXT_IID) /* Get the ID of this language. */ virtual PRUint32 GetScriptTypeID() = 0; /** * Compile and execute a script. * * @param aScript a string representing the script to be executed * @param aScopeObject a script object for the scope to execute in, or * nsnull to use a default scope * @param aPrincipal the principal that produced the script * @param aURL the URL or filename for error messages * @param aLineNo the starting line number of the script for error messages * @param aVersion the script language version to use when executing * @param aRetValue the result of executing the script, or null for no result. * If this is a JS context, it's the caller's responsibility to * preserve aRetValue from GC across this call * @param aIsUndefined true if the result of executing the script is the * undefined value * * @return NS_OK if the script was valid and got executed * **/ virtual nsresult EvaluateString(const nsAString& aScript, void *aScopeObject, nsIPrincipal *aPrincipal, const char *aURL, PRUint32 aLineNo, PRUint32 aVersion, nsAString *aRetValue, PRBool* aIsUndefined) = 0; // Note JS bigotry remains here - 'void *aRetValue' is assumed to be a // jsval. This must move to JSObject before it can be made agnostic. virtual nsresult EvaluateStringWithValue(const nsAString& aScript, void *aScopeObject, nsIPrincipal *aPrincipal, const char *aURL, PRUint32 aLineNo, PRUint32 aVersion, void* aRetValue, PRBool* aIsUndefined) = 0; /** * Compile a script. * * @param aText a PRUnichar buffer containing script source * @param aTextLength number of characters in aText * @param aScopeObject an object telling the scope in which to execute, * or nsnull to use a default scope * @param aPrincipal the principal that produced the script * @param aURL the URL or filename for error messages * @param aLineNo the starting line number of the script for error messages * @param aVersion the script language version to use when executing * @param aScriptObject an executable object that's the result of compiling * the script. * * @return NS_OK if the script source was valid and got compiled. * **/ virtual nsresult CompileScript(const PRUnichar* aText, PRInt32 aTextLength, void* aScopeObject, nsIPrincipal* aPrincipal, const char* aURL, PRUint32 aLineNo, PRUint32 aVersion, nsScriptObjectHolder &aScriptObject) = 0; /** * Execute a precompiled script object. * * @param aScriptObject an object representing the script to be executed * @param aScopeObject an object telling the scope in which to execute, * or nsnull to use a default scope * @param aRetValue the result of executing the script, may be null in * which case no result string is computed * @param aIsUndefined true if the result of executing the script is the * undefined value, may be null for "don't care" * * @return NS_OK if the script was valid and got executed * */ virtual nsresult ExecuteScript(void* aScriptObject, void* aScopeObject, nsAString* aRetValue, PRBool* aIsUndefined) = 0; /** * Compile the event handler named by atom aName, with function body aBody * into a function object returned if ok via aHandler. Does NOT bind the * function to anything - BindCompiledEventHandler() should be used for that * purpose. Note that this event handler is always considered 'shared' and * hence is compiled without principals. Never call the returned object * directly - it must be bound (and thereby cloned, and therefore have the * correct principals) before use! * * If the compilation sets a pending exception on the native context, it is * this method's responsibility to report said exception immediately, without * relying on callers to do so. * * * @param aName an nsIAtom pointer naming the function; it must be lowercase * and ASCII, and should not be longer than 63 chars. This bound on * length is enforced only by assertions, so caveat caller! * @param aEventName the name that the event object should be bound to * @param aBody the event handler function's body * @param aURL the URL or filename for error messages * @param aLineNo the starting line number of the script for error messages * @param aVersion the script language version to use when executing * @param aHandler the out parameter in which a void pointer to the compiled * function object is stored on success * * @return NS_OK if the function body was valid and got compiled */ virtual nsresult CompileEventHandler(nsIAtom* aName, PRUint32 aArgCount, const char** aArgNames, const nsAString& aBody, const char* aURL, PRUint32 aLineNo, PRUint32 aVersion, nsScriptObjectHolder &aHandler) = 0; /** * Call the function object with given args and return its boolean result, * or true if the result isn't boolean. * * @param aTarget the event target * @param aScript an object telling the scope in which to call the compiled * event handler function. * @param aHandler function object (function and static scope) to invoke. * @param argv array of arguments. Note each element is assumed to * be an nsIVariant. * @param rval out parameter returning result **/ virtual nsresult CallEventHandler(nsISupports* aTarget, void *aScope, void* aHandler, nsIArray *argv, nsIVariant **rval) = 0; /** * Bind an already-compiled event handler function to a name in the given * scope object. The same restrictions on aName (lowercase ASCII, not too * long) applies here as for CompileEventHandler. Scripting languages with * static scoping must re-bind the scope chain for aHandler to begin (after * the activation scope for aHandler itself, typically) with aTarget's scope. * * Logically, this 'bind' operation is more of a 'copy' - it simply * stashes/associates the event handler function with the event target, so * it can be fetched later with GetBoundEventHandler(). * * @param aTarget an object telling the scope in which to bind the compiled * event handler function. The context will presumably associate * this nsISupports with a native script object. * @param aName an nsIAtom pointer naming the function; it must be lowercase * and ASCII, and should not be longer than 63 chars. This bound on * length is enforced only by assertions, so caveat caller! * @param aHandler the function object to name, created by an earlier call to * CompileEventHandler * @return NS_OK if the function was successfully bound to the name * * XXXmarkh - fold this in with SetProperty? Exactly the same concept! */ virtual nsresult BindCompiledEventHandler(nsISupports* aTarget, void *aScope, nsIAtom* aName, void* aHandler) = 0; /** * Lookup a previously bound event handler for the specified target. This * will return an object equivilent to the one passed to * BindCompiledEventHandler (although the pointer may not be the same). * */ virtual nsresult GetBoundEventHandler(nsISupports* aTarget, void *aScope, nsIAtom* aName, nsScriptObjectHolder &aHandler) = 0; /** * Compile a function that isn't used as an event handler. * * NOTE: Not yet language agnostic (main problem is XBL - not yet agnostic) * Caller must make sure aFunctionObject is a JS GC root. * **/ virtual nsresult CompileFunction(void* aTarget, const nsACString& aName, PRUint32 aArgCount, const char** aArgArray, const nsAString& aBody, const char* aURL, PRUint32 aLineNo, PRUint32 aVersion, PRBool aShared, void **aFunctionObject) = 0; /** * Set the default scripting language version for this context, which must * be a context specific to a particular scripting language. * **/ virtual void SetDefaultLanguageVersion(PRUint32 aVersion) = 0; /** * Return the global object. * **/ virtual nsIScriptGlobalObject *GetGlobalObject() = 0; /** * Return the native script context * **/ virtual void *GetNativeContext() = 0; /** * Return the native global object for this context. * **/ virtual void *GetNativeGlobal() = 0; /** * Create a new global object that will be used for an inner window. * Return the native global and an nsISupports 'holder' that can be used * to manage the lifetime of it. */ virtual nsresult CreateNativeGlobalForInner( nsIScriptGlobalObject *aNewInner, PRBool aIsChrome, void **aNativeGlobal, nsISupports **aHolder) = 0; /** * Connect this context to a new inner window, to allow "prototype" * chaining from the inner to the outer. * Called after both the the inner and outer windows are initialized **/ virtual nsresult ConnectToInner(nsIScriptGlobalObject *aNewInner, void *aOuterGlobal) = 0; /** * Init this context ready for use. If aGlobalObject is not NULL, this * function may initialize based on this global (for example, using the * global to locate a chrome window, create a new 'scope' for this * global, etc) * * @param aGlobalObject the gobal object, which may be nsnull. * * @return NS_OK if context initialization was successful * **/ virtual nsresult InitContext(nsIScriptGlobalObject *aGlobalObject) = 0; /** * Check to see if context is as yet intialized. Used to prevent * reentrancy issues during the initialization process. * * @return PR_TRUE if initialized, PR_FALSE if not * */ virtual PRBool IsContextInitialized() = 0; /** * Called as the global object discards its reference to the context. */ virtual void FinalizeContext() = 0; /** * For garbage collected systems, do a synchronous collection pass. * May be a no-op on other systems * * @return NS_OK if the method is successful */ virtual void GC() = 0; /** * Inform the context that a script was evaluated. * A GC may be done if "necessary." * This call is necessary if script evaluation is done * without using the EvaluateScript method. * @param aTerminated If true then call termination function if it was * previously set. Within DOM this will always be true, but outside * callers (such as xpconnect) who may do script evaluations nested * inside DOM script evaluations can pass false to avoid premature * calls to the termination function. * @return NS_OK if the method is successful */ virtual void ScriptEvaluated(PRBool aTerminated) = 0; virtual nsresult Serialize(nsIObjectOutputStream* aStream, void *aScriptObject) = 0; /* Deserialize a script from a stream. */ virtual nsresult Deserialize(nsIObjectInputStream* aStream, nsScriptObjectHolder &aResult) = 0; /** * JS only - this function need not be implemented by languages other * than JS (ie, this should be moved to a private interface!) * Called to specify a function that should be called when the current * script (if there is one) terminates. Generally used if breakdown * of script state needs to happen, but should be deferred till * the end of script evaluation. * * @throws NS_ERROR_OUT_OF_MEMORY if that happens */ virtual nsresult SetTerminationFunction(nsScriptTerminationFunc aFunc, nsISupports* aRef) = 0; /** * Called to disable/enable script execution in this context. */ virtual PRBool GetScriptsEnabled() = 0; virtual void SetScriptsEnabled(PRBool aEnabled, PRBool aFireTimeouts) = 0; // SetProperty is suspect and jst believes should not be needed. Currenly // used only for "arguments". virtual nsresult SetProperty(void *aTarget, const char *aPropName, nsISupports *aVal) = 0; /** * Called to set/get information if the script context is * currently processing a script tag */ virtual PRBool GetProcessingScriptTag() = 0; virtual void SetProcessingScriptTag(PRBool aResult) = 0; /** * Tell the context whether or not to GC when destroyed. An optimization * used when the window is a [i]frame, so GC will happen anyway. */ virtual void SetGCOnDestruction(PRBool aGCOnDestruction) = 0; /** * Initialize DOM classes on aGlobalObj, always call * WillInitializeContext() before calling InitContext(), and always * call DidInitializeContext() when a context is fully * (successfully) initialized. */ virtual nsresult InitClasses(void *aGlobalObj) = 0; /** * Clear the scope object - may be called either as we are being torn down, * or before we are attached to a different document. * * aClearFromProtoChain is probably somewhat JavaScript specific. It * indicates that the global scope polluter should be removed from the * prototype chain and that the objects in the prototype chain should * also have their scopes cleared. We don't do this all the time * because the prototype chain is shared between inner and outer * windows, and needs to stay with inner windows that we're keeping * around. */ virtual void ClearScope(void* aGlobalObj, PRBool aClearFromProtoChain) = 0; /** * Tell the context we're about to be reinitialize it. */ virtual void WillInitializeContext() = 0; /** * Tell the context we're done reinitializing it. */ virtual void DidInitializeContext() = 0; /** * Tell the context our global has a new document, and the scope * used by it. Use nsISupports to avoid dependency issues - but expect * a QI for nsIDOMDocument and/or nsIDocument. */ virtual void DidSetDocument(nsISupports *aDoc, void *aGlobal) = 0; /* Memory managment for script objects. Used by the implementation of * nsScriptObjectHolder to manage the lifetimes of the held script objects. * * See also nsIScriptRuntime, which has identical methods and is useful * in situations when you do not have an nsIScriptContext. * */ virtual nsresult DropScriptObject(void *object) = 0; virtual nsresult HoldScriptObject(void *object) = 0; }; NS_DEFINE_STATIC_IID_ACCESSOR(nsIScriptContext, NS_ISCRIPTCONTEXT_IID) #endif // nsIScriptContext_h__