//
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// _RXDelegateProxy.m
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// RxCocoa
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//
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// Created by Krunoslav Zaher on 7/4/15.
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// Copyright © 2015 Krunoslav Zaher. All rights reserved.
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//
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#import "include/_RXDelegateProxy.h"
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#import "include/_RX.h"
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#import "include/_RXObjCRuntime.h"
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@interface _RXDelegateProxy () {
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id __weak __forwardToDelegate;
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}
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@property (nonatomic, strong) id strongForwardDelegate;
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@end
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static NSMutableDictionary *voidSelectorsPerClass = nil;
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@implementation _RXDelegateProxy
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+(NSSet*)collectVoidSelectorsForProtocol:(Protocol *)protocol {
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NSMutableSet *selectors = [NSMutableSet set];
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unsigned int protocolMethodCount = 0;
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struct objc_method_description *pMethods = protocol_copyMethodDescriptionList(protocol, NO, YES, &protocolMethodCount);
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for (unsigned int i = 0; i < protocolMethodCount; ++i) {
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struct objc_method_description method = pMethods[i];
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if (RX_is_method_with_description_void(method)) {
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[selectors addObject:SEL_VALUE(method.name)];
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}
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}
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free(pMethods);
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unsigned int numberOfBaseProtocols = 0;
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Protocol * __unsafe_unretained * pSubprotocols = protocol_copyProtocolList(protocol, &numberOfBaseProtocols);
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for (unsigned int i = 0; i < numberOfBaseProtocols; ++i) {
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[selectors unionSet:[self collectVoidSelectorsForProtocol:pSubprotocols[i]]];
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}
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free(pSubprotocols);
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return selectors;
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}
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+(void)initialize {
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@synchronized (_RXDelegateProxy.class) {
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if (voidSelectorsPerClass == nil) {
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voidSelectorsPerClass = [[NSMutableDictionary alloc] init];
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}
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NSMutableSet *voidSelectors = [NSMutableSet set];
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#define CLASS_HIERARCHY_MAX_DEPTH 100
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NSInteger classHierarchyDepth = 0;
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Class targetClass = NULL;
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for (classHierarchyDepth = 0, targetClass = self;
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classHierarchyDepth < CLASS_HIERARCHY_MAX_DEPTH && targetClass != nil;
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++classHierarchyDepth, targetClass = class_getSuperclass(targetClass)
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) {
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unsigned int count;
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Protocol *__unsafe_unretained *pProtocols = class_copyProtocolList(targetClass, &count);
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for (unsigned int i = 0; i < count; i++) {
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NSSet *selectorsForProtocol = [self collectVoidSelectorsForProtocol:pProtocols[i]];
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[voidSelectors unionSet:selectorsForProtocol];
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}
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free(pProtocols);
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}
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if (classHierarchyDepth == CLASS_HIERARCHY_MAX_DEPTH) {
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NSLog(@"Detected weird class hierarchy with depth over %d. Starting with this class -> %@", CLASS_HIERARCHY_MAX_DEPTH, self);
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#if DEBUG
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abort();
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#endif
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}
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voidSelectorsPerClass[CLASS_VALUE(self)] = voidSelectors;
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}
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}
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-(id)_forwardToDelegate {
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return __forwardToDelegate;
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}
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-(void)_setForwardToDelegate:(id __nullable)forwardToDelegate retainDelegate:(BOOL)retainDelegate {
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__forwardToDelegate = forwardToDelegate;
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if (retainDelegate) {
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self.strongForwardDelegate = forwardToDelegate;
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}
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else {
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self.strongForwardDelegate = nil;
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}
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}
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-(BOOL)hasWiredImplementationForSelector:(SEL)selector {
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return [super respondsToSelector:selector];
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}
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-(BOOL)voidDelegateMethodsContain:(SEL)selector {
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@synchronized(_RXDelegateProxy.class) {
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NSSet *voidSelectors = voidSelectorsPerClass[CLASS_VALUE(self.class)];
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NSAssert(voidSelectors != nil, @"Set of allowed methods not initialized");
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return [voidSelectors containsObject:SEL_VALUE(selector)];
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}
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}
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-(NSMethodSignature *)methodSignatureForSelector:(SEL)selector {
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NSMethodSignature *signature = [super methodSignatureForSelector:selector];
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if (!signature) {
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signature = [self._forwardToDelegate methodSignatureForSelector:selector];
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}
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return signature;
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}
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-(void)forwardInvocation:(NSInvocation *)anInvocation {
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BOOL isVoid = RX_is_method_signature_void(anInvocation.methodSignature);
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NSArray *arguments = nil;
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if (isVoid) {
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arguments = RX_extract_arguments(anInvocation);
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[self _sentMessage:anInvocation.selector withArguments:arguments];
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}
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if (self._forwardToDelegate && [self._forwardToDelegate respondsToSelector:anInvocation.selector]) {
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[anInvocation invokeWithTarget:self._forwardToDelegate];
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}
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if (isVoid) {
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[self _methodInvoked:anInvocation.selector withArguments:arguments];
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}
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}
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// abstract method
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-(void)_sentMessage:(SEL)selector withArguments:(NSArray *)arguments {
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}
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// abstract method
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-(void)_methodInvoked:(SEL)selector withArguments:(NSArray *)arguments {
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}
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-(void)dealloc {
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}
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@end
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