/*
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* Copyright 2018 Google LLC
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#import <Foundation/Foundation.h>
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NS_ASSUME_NONNULL_BEGIN
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/** This class handles the runtime manipulation necessary to instrument selectors. It stores the
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* classes and selectors that have been swizzled, and runs all operations on its own queue.
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*/
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@interface GULSwizzler : NSObject
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/** Manipulates the Objective-C runtime to replace the original IMP with the supplied block.
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*
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* @param aClass The class to swizzle.
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* @param selector The selector of the class to swizzle.
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* @param isClassSelector A BOOL specifying whether the selector is a class or instance selector.
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* @param block The block that replaces the original IMP.
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*/
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+ (void)swizzleClass:(Class)aClass
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selector:(SEL)selector
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isClassSelector:(BOOL)isClassSelector
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withBlock:(nullable id)block;
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/** Returns the current IMP for the given class and selector.
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*
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* @param aClass The class to use.
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* @param selector The selector to find the implementation of.
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* @param isClassSelector A BOOL specifying whether the selector is a class or instance selector.
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* @return The implementation of the selector in the runtime.
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*/
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+ (nullable IMP)currentImplementationForClass:(Class)aClass
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selector:(SEL)selector
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isClassSelector:(BOOL)isClassSelector;
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/** Checks the runtime to see if a selector exists on a class. If a property is declared as
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* @dynamic, we have a reverse swizzling situation, where the implementation of a method exists
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* only in concrete subclasses, and NOT in the superclass. We can detect that situation using
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* this helper method. Similarly, we can detect situations where a class doesn't implement a
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* protocol method.
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*
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* @param selector The selector to check for.
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* @param aClass The class to check.
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* @param isClassSelector A BOOL specifying whether the selector is a class or instance selector.
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* @return YES if the method was found in this selector/class combination, NO otherwise.
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*/
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+ (BOOL)selector:(SEL)selector existsInClass:(Class)aClass isClassSelector:(BOOL)isClassSelector;
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/** Returns a list of all Objective-C (and not primitive) ivars contained by the given object.
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*
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* @param object The object whose ivars will be iterated.
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* @return The list of ivar objects.
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*/
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+ (NSArray<id> *)ivarObjectsForObject:(id)object;
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@end
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NS_ASSUME_NONNULL_END
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