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55 changes: 55 additions & 0 deletions
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iphone/TitaniumKit/TitaniumKit/Sources/Kroll/KrollWrapper.h
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| /** | ||
| * Appcelerator Titanium Mobile | ||
| * Copyright (c) 2009-2018 by Appcelerator, Inc. All Rights Reserved. | ||
| * Licensed under the terms of the Apache Public License | ||
| * Please see the LICENSE included with this distribution for details. | ||
| */ | ||
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| #import "KrollContext.h" | ||
| #import <Foundation/Foundation.h> | ||
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| @class KrollBridge; | ||
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| /* | ||
| * For functions and other objects that need to be held by proxies without | ||
| * conversion or possible retain cycles, KrollWrapper passively refers to a | ||
| * JS Object. In the future, this should become the base class, instead of a | ||
| * collection of Kroll wrappers all based off of NSObject despite common | ||
| * functionality. | ||
| * | ||
| * NOTE: This is an object that is never made explicitly by TiIdToValue; | ||
| * instead, all JS functions become KrollCallbacks, and both KrollCallbacks | ||
| * and KrollObjectProperties will be converted into functions. | ||
| * (or TiObjectRefs at any rate) | ||
| * Instead, KrollWrapper is used in two places currently: When a function is | ||
| * retained as a property by a proxy (to avoid the above retain loop), | ||
| * and for JS-based modules which do not need proxy properties but do need to | ||
| * be first-class JS object citizens. | ||
| * TODO: Consolidate various KrollObjects, KrollCallbacks, etc to be | ||
| * KrollWrappers. | ||
| */ | ||
| @interface KrollWrapper : NSObject { | ||
| JSObjectRef jsobject; | ||
| KrollBridge *bridge; | ||
| BOOL protecting; | ||
| } | ||
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| // Access the native JSCore object | ||
| @property (nonatomic, readwrite, assign) JSObjectRef jsobject; | ||
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| // Access the kroll bridge (e.g. for the kroll context) | ||
| @property (nonatomic, readwrite, assign) KrollBridge *bridge; | ||
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| // Protects a JSObject from being GC'd | ||
| - (void)protectJsobject; | ||
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| // Unprotects a JSObject from being GC'd | ||
| - (void)unprotectJsobject; | ||
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| // Replaces a value for a given key in it's underlaying JSContext | ||
| - (void)replaceValue:(id)value forKey:(NSString *)key notification:(BOOL)notify; | ||
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| // Executes an async JavaScript function and returns the resulting JSCore value if any | ||
| - (JSValueRef)executeWithArguments:(NSArray<id> *)arguments; | ||
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| @end |
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iphone/TitaniumKit/TitaniumKit/Sources/Kroll/KrollWrapper.m
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| /** | ||
| * Appcelerator Titanium Mobile | ||
| * Copyright (c) 2009-2018 by Appcelerator, Inc. All Rights Reserved. | ||
| * Licensed under the terms of the Apache Public License | ||
| * Please see the LICENSE included with this distribution for details. | ||
| */ | ||
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| #import "KrollWrapper.h" | ||
| #import "KrollBridge.h" | ||
| #import "KrollCallback.h" | ||
| #import "KrollObject.h" | ||
| #import "TiExceptionHandler.h" | ||
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| @implementation KrollWrapper | ||
| @synthesize jsobject, bridge; | ||
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| /* NOTE: | ||
| * Until KrollWrapper takes a more expanded role as a general purpose wrapper, | ||
| * protectJsobject is to be used during commonJS inclusion ONLY. | ||
| * For example, KrollBridge ensures that this is only done in the JS thread, | ||
| * and unlike KrollObject, KrollWrapper does not have the infrastructure to | ||
| * handle being called outside the JS. | ||
| * Furthermore, KrollWrapper does not get notified of JSObject finalization, | ||
| * etc, etc. The specific cases where KrollWrapper is currently used do not | ||
| * make this an issue, but KrollWrapper needs hardening if it is to be a base | ||
| * class. | ||
| */ | ||
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| - (void)dealloc | ||
| { | ||
| if (protecting) { | ||
| [self unprotectJsobject]; | ||
| } | ||
| [super dealloc]; | ||
| } | ||
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| - (void)protectJsobject | ||
| { | ||
| if (protecting || ![KrollBridge krollBridgeExists:bridge]) { | ||
| return; | ||
| } | ||
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| if (![[bridge krollContext] isKJSThread]) { | ||
| DeveloperLog(@"[WARN] KrollWrapper trying to protect in the wrong thread.%@", CODELOCATION); | ||
| return; | ||
| } | ||
| protecting = YES; | ||
| JSValueProtect([[bridge krollContext] context], jsobject); | ||
| } | ||
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| - (void)unprotectJsobject | ||
| { | ||
| if (!protecting || ![KrollBridge krollBridgeExists:bridge]) { | ||
| return; | ||
| } | ||
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| if (![[bridge krollContext] isKJSThread]) { | ||
| DeveloperLog(@"[WARN] KrollWrapper trying to unprotect in the wrong thread.%@", CODELOCATION); | ||
| return; | ||
| } | ||
| protecting = NO; | ||
| JSValueUnprotect([[bridge krollContext] context], jsobject); | ||
| } | ||
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| - (void)replaceValue:(id)value forKey:(NSString *)key notification:(BOOL)notify | ||
| { /* | ||
| * This is to be used ONLY from KrollBridge's require call, due to some | ||
| * JS files assigning exports to a function instead of a standard | ||
| * JS object. | ||
| */ | ||
| KrollContext *context = [bridge krollContext]; | ||
| JSValueRef valueRef = [KrollObject toValue:context value:value]; | ||
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| /* | ||
| * Properties can only be added to objects | ||
| */ | ||
| if (JSValueIsObject([context context], jsobject)) { | ||
| JSStringRef keyRef = JSStringCreateWithCFString((CFStringRef)key); | ||
| JSObjectSetProperty([context context], jsobject, keyRef, valueRef, kJSPropertyAttributeReadOnly, NULL); | ||
| JSStringRelease(keyRef); | ||
| } | ||
| } | ||
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| - (JSValueRef)executeWithArguments:(NSArray<id> *)arguments | ||
| { | ||
| if (![KrollBridge krollBridgeExists:[self bridge]]) { | ||
| return NULL; | ||
| } | ||
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| JSObjectRef value = [self jsobject]; | ||
| JSContextRef context = [self.bridge.krollContext context]; | ||
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| JSValueRef callException = NULL; | ||
| JSValueRef callArgs[arguments.count]; | ||
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| for (NSUInteger i = 0; i < arguments.count; i++) { | ||
| callArgs[i] = [KrollObject toValue:self.bridge.krollContext value:[arguments objectAtIndex:i]]; | ||
| } | ||
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| JSValueRef functionResult = JSObjectCallAsFunction(context, value, NULL, 1, callArgs, &callException); | ||
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| if (callException != NULL) { | ||
| id exceptionPayload = [KrollObject toID:self.bridge.krollContext value:callException]; | ||
| [[TiExceptionHandler defaultExceptionHandler] reportScriptError:[TiUtils scriptErrorValue:exceptionPayload]]; | ||
| } | ||
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| return functionResult; | ||
| } | ||
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| @end |
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