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295
Tweaks/FLEX/Utility/Runtime/Objc/Reflection/FLEXProperty.m
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295
Tweaks/FLEX/Utility/Runtime/Objc/Reflection/FLEXProperty.m
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//
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// FLEXProperty.m
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// FLEX
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//
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// Derived from MirrorKit.
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// Created by Tanner on 6/30/15.
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// Copyright (c) 2020 FLEX Team. All rights reserved.
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//
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#import "FLEXProperty.h"
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#import "FLEXPropertyAttributes.h"
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#import "FLEXMethodBase.h"
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#import "FLEXRuntimeUtility.h"
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#include <dlfcn.h>
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@interface FLEXProperty () {
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NSString *_flex_description;
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}
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@property (nonatomic ) BOOL uniqueCheckFlag;
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@property (nonatomic, readonly) Class cls;
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@end
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@implementation FLEXProperty
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@synthesize multiple = _multiple;
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@synthesize imageName = _imageName;
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@synthesize imagePath = _imagePath;
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#pragma mark Initializers
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- (id)init {
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[NSException
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raise:NSInternalInconsistencyException
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format:@"Class instance should not be created with -init"
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];
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return nil;
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}
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+ (instancetype)property:(objc_property_t)property {
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return [[self alloc] initWithProperty:property onClass:nil];
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}
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+ (instancetype)property:(objc_property_t)property onClass:(Class)cls {
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return [[self alloc] initWithProperty:property onClass:cls];
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}
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+ (instancetype)named:(NSString *)name onClass:(Class)cls {
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objc_property_t _Nullable property = class_getProperty(cls, name.UTF8String);
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NSAssert(property, @"Cannot find property with name %@ on class %@", name, cls);
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return [self property:property onClass:cls];
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}
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+ (instancetype)propertyWithName:(NSString *)name attributes:(FLEXPropertyAttributes *)attributes {
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return [[self alloc] initWithName:name attributes:attributes];
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}
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- (id)initWithProperty:(objc_property_t)property onClass:(Class)cls {
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NSParameterAssert(property);
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self = [super init];
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if (self) {
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_objc_property = property;
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_attributes = [FLEXPropertyAttributes attributesForProperty:property];
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_name = @(property_getName(property) ?: "(nil)");
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_cls = cls;
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if (!_attributes) [NSException raise:NSInternalInconsistencyException format:@"Error retrieving property attributes"];
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if (!_name) [NSException raise:NSInternalInconsistencyException format:@"Error retrieving property name"];
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[self examine];
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}
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return self;
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}
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- (id)initWithName:(NSString *)name attributes:(FLEXPropertyAttributes *)attributes {
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NSParameterAssert(name); NSParameterAssert(attributes);
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self = [super init];
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if (self) {
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_attributes = attributes;
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_name = name;
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[self examine];
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}
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return self;
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}
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#pragma mark Private
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- (void)examine {
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if (self.attributes.typeEncoding.length) {
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_type = (FLEXTypeEncoding)[self.attributes.typeEncoding characterAtIndex:0];
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}
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// Return the given selector if the class responds to it
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Class cls = _cls;
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SEL (^selectorIfValid)(SEL) = ^SEL(SEL sel) {
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if (!sel || !cls) return nil;
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return [cls instancesRespondToSelector:sel] ? sel : nil;
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};
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SEL customGetter = self.attributes.customGetter;
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SEL customSetter = self.attributes.customSetter;
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SEL defaultGetter = NSSelectorFromString(self.name);
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SEL defaultSetter = NSSelectorFromString([NSString
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stringWithFormat:@"set%c%@:",
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(char)toupper([self.name characterAtIndex:0]),
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[self.name substringFromIndex:1]
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]);
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// Check if the likely getters/setters exist
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SEL validGetter = selectorIfValid(customGetter) ?: selectorIfValid(defaultGetter);
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SEL validSetter = selectorIfValid(customSetter) ?: selectorIfValid(defaultSetter);
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_likelyGetterExists = validGetter != nil;
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_likelySetterExists = validSetter != nil;
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// Assign likely getters and setters to the valid one,
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// or the default, regardless of whether the default exists
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_likelyGetter = validGetter ?: defaultGetter;
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_likelySetter = validSetter ?: defaultSetter;
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_likelyGetterString = NSStringFromSelector(_likelyGetter);
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_likelySetterString = NSStringFromSelector(_likelySetter);
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_isClassProperty = _cls ? class_isMetaClass(_cls) : NO;
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_likelyIvarName = _isClassProperty ? nil : (
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self.attributes.backingIvar ?: [@"_" stringByAppendingString:_name]
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);
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}
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#pragma mark Overrides
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- (NSString *)description {
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if (!_flex_description) {
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NSString *readableType = [FLEXRuntimeUtility readableTypeForEncoding:self.attributes.typeEncoding];
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_flex_description = [FLEXRuntimeUtility appendName:self.name toType:readableType];
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}
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return _flex_description;
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}
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- (NSString *)debugDescription {
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return [NSString stringWithFormat:@"<%@ name=%@, property=%p, attributes:\n\t%@\n>",
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NSStringFromClass(self.class), self.name, self.objc_property, self.attributes];
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}
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#pragma mark Public
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- (objc_property_attribute_t *)copyAttributesList:(unsigned int *)attributesCount {
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if (self.objc_property) {
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return property_copyAttributeList(self.objc_property, attributesCount);
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} else {
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return [self.attributes copyAttributesList:attributesCount];
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}
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}
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- (void)replacePropertyOnClass:(Class)cls {
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class_replaceProperty(cls, self.name.UTF8String, self.attributes.list, (unsigned int)self.attributes.count);
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}
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- (void)computeSymbolInfo:(BOOL)forceBundle {
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Dl_info exeInfo;
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if (dladdr(_objc_property, &exeInfo)) {
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_imagePath = exeInfo.dli_fname ? @(exeInfo.dli_fname) : nil;
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}
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if ((!_multiple || !_uniqueCheckFlag) && _cls) {
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_multiple = _objc_property != class_getProperty(_cls, self.name.UTF8String);
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if (_multiple || forceBundle) {
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NSString *path = _imagePath.stringByDeletingLastPathComponent;
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_imageName = [NSBundle bundleWithPath:path].executablePath.lastPathComponent;
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}
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}
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}
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- (BOOL)multiple {
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[self computeSymbolInfo:NO];
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return _multiple;
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}
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- (NSString *)imagePath {
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[self computeSymbolInfo:YES];
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return _imagePath;
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}
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- (NSString *)imageName {
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[self computeSymbolInfo:YES];
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return _imageName;
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}
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- (BOOL)likelyIvarExists {
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if (_likelyIvarName && _cls) {
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return class_getInstanceVariable(_cls, _likelyIvarName.UTF8String) != nil;
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}
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return NO;
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}
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- (NSString *)fullDescription {
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NSMutableArray<NSString *> *attributesStrings = [NSMutableArray new];
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FLEXPropertyAttributes *attributes = self.attributes;
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// Atomicity
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if (attributes.isNonatomic) {
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[attributesStrings addObject:@"nonatomic"];
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} else {
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[attributesStrings addObject:@"atomic"];
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}
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// Storage
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if (attributes.isRetained) {
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[attributesStrings addObject:@"strong"];
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} else if (attributes.isCopy) {
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[attributesStrings addObject:@"copy"];
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} else if (attributes.isWeak) {
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[attributesStrings addObject:@"weak"];
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} else {
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[attributesStrings addObject:@"assign"];
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}
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// Mutability
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if (attributes.isReadOnly) {
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[attributesStrings addObject:@"readonly"];
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} else {
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[attributesStrings addObject:@"readwrite"];
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}
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// Class or not
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if (self.isClassProperty) {
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[attributesStrings addObject:@"class"];
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}
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// Custom getter/setter
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SEL customGetter = attributes.customGetter;
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SEL customSetter = attributes.customSetter;
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if (customGetter) {
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[attributesStrings addObject:[NSString stringWithFormat:@"getter=%s", sel_getName(customGetter)]];
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}
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if (customSetter) {
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[attributesStrings addObject:[NSString stringWithFormat:@"setter=%s", sel_getName(customSetter)]];
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}
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NSString *attributesString = [attributesStrings componentsJoinedByString:@", "];
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return [NSString stringWithFormat:@"@property (%@) %@", attributesString, self.description];
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}
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- (id)getValue:(id)target {
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if (!target) return nil;
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// We don't care about checking dynamically whether the getter
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// _now_ exists on this object. If the getter doesn't exist
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// when this property is initialized, it will never call it.
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// Just re-create the property object if you need to call it.
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if (self.likelyGetterExists) {
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BOOL objectIsClass = object_isClass(target);
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BOOL instanceAndInstanceProperty = !objectIsClass && !self.isClassProperty;
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BOOL classAndClassProperty = objectIsClass && self.isClassProperty;
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if (instanceAndInstanceProperty || classAndClassProperty) {
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return [FLEXRuntimeUtility performSelector:self.likelyGetter onObject:target];
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}
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}
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return nil;
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}
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- (id)getPotentiallyUnboxedValue:(id)target {
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if (!target) return nil;
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return [FLEXRuntimeUtility
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potentiallyUnwrapBoxedPointer:[self getValue:target]
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type:self.attributes.typeEncoding.UTF8String
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];
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}
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#pragma mark Suggested getters and setters
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- (FLEXMethodBase *)getterWithImplementation:(IMP)implementation {
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NSString *types = [NSString stringWithFormat:@"%@%s%s", self.attributes.typeEncoding, @encode(id), @encode(SEL)];
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NSString *name = [NSString stringWithFormat:@"%@", self.name];
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FLEXMethodBase *getter = [FLEXMethodBase buildMethodNamed:name withTypes:types implementation:implementation];
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return getter;
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}
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- (FLEXMethodBase *)setterWithImplementation:(IMP)implementation {
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NSString *types = [NSString stringWithFormat:@"%s%s%s%@", @encode(void), @encode(id), @encode(SEL), self.attributes.typeEncoding];
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NSString *name = [NSString stringWithFormat:@"set%@:", self.name.capitalizedString];
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FLEXMethodBase *setter = [FLEXMethodBase buildMethodNamed:name withTypes:types implementation:implementation];
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return setter;
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}
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@end
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