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Tweaks/FLEX/Utility/Runtime/Objc/Reflection/FLEXMirror.m

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+//
+//  FLEXMirror.m
+//  FLEX
+//
+//  Derived from MirrorKit.
+//  Created by Tanner on 6/29/15.
+//  Copyright (c) 2020 FLEX Team. All rights reserved.
+//
+
+#import "FLEXMirror.h"
+#import "FLEXProperty.h"
+#import "FLEXMethod.h"
+#import "FLEXIvar.h"
+#import "FLEXProtocol.h"
+#import "FLEXUtility.h"
+
+
+#pragma mark FLEXMirror
+
+@implementation FLEXMirror
+
+- (id)init {
+    [NSException
+        raise:NSInternalInconsistencyException
+        format:@"Class instance should not be created with -init"
+    ];
+    return nil;
+}
+
+#pragma mark Initialization
++ (instancetype)reflect:(id)objectOrClass {
+    return [[self alloc] initWithSubject:objectOrClass];
+}
+
+- (id)initWithSubject:(id)objectOrClass {
+    NSParameterAssert(objectOrClass);
+    
+    self = [super init];
+    if (self) {
+        _value = objectOrClass;
+        [self examine];
+    }
+    
+    return self;
+}
+
+- (NSString *)description {
+    return [NSString stringWithFormat:@"<%@ %@=%@>",
+        NSStringFromClass(self.class),
+        self.isClass ? @"metaclass" : @"class",
+        self.className
+    ];
+}
+
+- (void)examine {
+    BOOL isClass = object_isClass(self.value);
+    Class cls  = isClass ? self.value : object_getClass(self.value);
+    Class meta = object_getClass(cls);
+    _className = NSStringFromClass(cls);
+    _isClass   = isClass;
+    
+    unsigned int pcount, cpcount, mcount, cmcount, ivcount, pccount;
+    Ivar *objcIvars                       = class_copyIvarList(cls, &ivcount);
+    Method *objcMethods                   = class_copyMethodList(cls, &mcount);
+    Method *objcClsMethods                = class_copyMethodList(meta, &cmcount);
+    objc_property_t *objcProperties       = class_copyPropertyList(cls, &pcount);
+    objc_property_t *objcClsProperties    = class_copyPropertyList(meta, &cpcount);
+    Protocol *__unsafe_unretained *protos = class_copyProtocolList(cls, &pccount);
+    
+    _ivars = [NSArray flex_forEachUpTo:ivcount map:^id(NSUInteger i) {
+        return [FLEXIvar ivar:objcIvars[i]];
+    }];
+    
+    _methods = [NSArray flex_forEachUpTo:mcount map:^id(NSUInteger i) {
+        return [FLEXMethod method:objcMethods[i] isInstanceMethod:YES];
+    }];
+    _classMethods = [NSArray flex_forEachUpTo:cmcount map:^id(NSUInteger i) {
+        return [FLEXMethod method:objcClsMethods[i] isInstanceMethod:NO];
+    }];
+    
+    _properties = [NSArray flex_forEachUpTo:pcount map:^id(NSUInteger i) {
+        return [FLEXProperty property:objcProperties[i] onClass:cls];
+    }];
+    _classProperties = [NSArray flex_forEachUpTo:cpcount map:^id(NSUInteger i) {
+        return [FLEXProperty property:objcClsProperties[i] onClass:meta];
+    }];
+    
+    _protocols = [NSArray flex_forEachUpTo:pccount map:^id(NSUInteger i) {
+        return [FLEXProtocol protocol:protos[i]];
+    }];
+    
+    // Cleanup
+    free(objcClsProperties);
+    free(objcProperties);
+    free(objcClsMethods);
+    free(objcMethods);
+    free(objcIvars);
+    free(protos);
+    protos = NULL;
+}
+
+#pragma mark Misc
+
+- (FLEXMirror *)superMirror {
+    Class cls = _isClass ? _value : object_getClass(_value);
+    return [FLEXMirror reflect:class_getSuperclass(cls)];
+}
+
+@end
+
+
+#pragma mark ExtendedMirror
+
+@implementation FLEXMirror (ExtendedMirror)
+
+- (id)filter:(NSArray *)array forName:(NSString *)name {
+    NSPredicate *filter = [NSPredicate predicateWithFormat:@"%K = %@", @"name", name];
+    return [array filteredArrayUsingPredicate:filter].firstObject;
+}
+
+- (FLEXMethod *)methodNamed:(NSString *)name {
+    return [self filter:self.methods forName:name];
+}
+
+- (FLEXMethod *)classMethodNamed:(NSString *)name {
+    return [self filter:self.classMethods forName:name];
+}
+
+- (FLEXProperty *)propertyNamed:(NSString *)name {
+    return [self filter:self.properties forName:name];
+}
+
+- (FLEXProperty *)classPropertyNamed:(NSString *)name {
+    return [self filter:self.classProperties forName:name];
+}
+
+- (FLEXIvar *)ivarNamed:(NSString *)name {
+    return [self filter:self.ivars forName:name];
+}
+
+- (FLEXProtocol *)protocolNamed:(NSString *)name {
+    return [self filter:self.protocols forName:name];
+}
+
+@end