nsIScriptContext.h
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#ifndef nsIScriptContext_h__
#define nsIScriptContext_h__
#include "nscore.h"
#include "nsStringGlue.h"
#include "nsISupports.h"
#include "nsCOMPtr.h"
#include "nsIProgrammingLanguage.h"
#include "jspubtd.h"
class nsIScriptGlobalObject;
class nsIScriptSecurityManager;
class nsIPrincipal;
class nsIAtom;
class nsIArray;
class nsIVariant;
class nsIObjectInputStream;
class nsIObjectOutputStream;
class nsScriptObjectHolder;
class nsIScriptObjectPrincipal;
typedef void (*nsScriptTerminationFunc)(nsISupports* aRef);
#define NS_ISCRIPTCONTEXTPRINCIPAL_IID \
{ 0xd012cdb3, 0x8f1e, 0x4440, \
{ 0x8c, 0xbd, 0x32, 0x7f, 0x98, 0x1d, 0x37, 0xb4 } }
class nsIScriptContextPrincipal : public nsISupports
{
public:
NS_DECLARE_STATIC_IID_ACCESSOR(NS_ISCRIPTCONTEXTPRINCIPAL_IID)
virtual nsIScriptObjectPrincipal* GetObjectPrincipal() = 0;
};
NS_DEFINE_STATIC_IID_ACCESSOR(nsIScriptContextPrincipal,
NS_ISCRIPTCONTEXTPRINCIPAL_IID)
#define NS_ISCRIPTCONTEXT_IID \
{ 0x2e583bf4, 0x3c1f, 0x432d, \
{ 0x82, 0x83, 0x8d, 0xee, 0x7e, 0xcc, 0xc8, 0x8b } }
/* 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.
*/
class nsIScriptContext : public nsIScriptContextPrincipal
{
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,
JSObject* aScopeObject,
nsIPrincipal *aPrincipal,
const char *aURL,
PRUint32 aLineNo,
PRUint32 aVersion,
nsAString *aRetValue,
bool* 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,
bool* 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(JSScript* aScriptObject,
JSObject* aScopeObject,
nsAString* aRetValue,
bool* 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,
JSObject* aScope, void* aHandler,
nsIArray *argv, nsIVariant **rval) = 0;
/**
* Bind an already-compiled event handler function to the given
* target. 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.
*
* The result of the bind operation is a new handler object, with
* principals now set and scope set as above. This is returned in
* aBoundHandler. When this function is called, aBoundHandler is
* expected to not be holding an object.
*
* @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 aScope the scope in which the script object for aTarget should be
* looked for.
* @param aHandler the function object to bind, created by an earlier call to
* CompileEventHandler
* @param aBoundHandler [out] the result of the bind operation.
* @return NS_OK if the function was successfully bound
*/
virtual nsresult BindCompiledEventHandler(nsISupports* aTarget,
JSObject* aScope,
void* aHandler,
nsScriptObjectHolder& aBoundHandler) = 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,
bool 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 JSContext* GetNativeContext() = 0;
/**
* Return the native global object for this context.
*
**/
virtual JSObject* 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,
bool aIsChrome,
nsIPrincipal *aPrincipal,
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;
/**
* Initialize the context generally. Does not create a global object.
**/
virtual nsresult InitContext() = 0;
/**
* Creates the outer window for this context.
*
* @param aGlobalObject The script global object to use as our global.
*/
virtual nsresult CreateOuterObject(nsIScriptGlobalObject *aGlobalObject,
nsIScriptGlobalObject *aCurrentInner) = 0;
/**
* Given an outer object, updates this context with that outer object.
*/
virtual nsresult SetOuterObject(void *aOuterObject) = 0;
/**
* Prepares this context for use with the current inner window for the
* context's global object. This must be called after CreateOuterObject.
*/
virtual nsresult InitOuterWindow() = 0;
/**
* Check to see if context is as yet intialized. Used to prevent
* reentrancy issues during the initialization process.
*
* @return true if initialized, false if not
*
*/
virtual bool 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(bool aTerminated) = 0;
virtual nsresult Serialize(nsIObjectOutputStream* aStream,
JSScript* 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 bool GetScriptsEnabled() = 0;
virtual void SetScriptsEnabled(bool aEnabled, bool 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 bool GetProcessingScriptTag() = 0;
virtual void SetProcessingScriptTag(bool aResult) = 0;
/**
* Called to find out if this script context might be executing script.
*/
virtual bool GetExecutingScript() = 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(bool 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, bool 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;
/* 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;
virtual void EnterModalState() = 0;
virtual void LeaveModalState() = 0;
};
NS_DEFINE_STATIC_IID_ACCESSOR(nsIScriptContext, NS_ISCRIPTCONTEXT_IID)
#endif // nsIScriptContext_h__
