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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,14 @@ | ||
| // | ||
| // EXTPassthroughTest.h | ||
| // extobjc | ||
| // | ||
| // Created by Justin Spahr-Summers on 2012-07-03. | ||
| // Released into the public domain. | ||
| // | ||
|
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| #import <SenTestingKit/SenTestingKit.h> | ||
| #import "EXTPassthrough.h" | ||
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| @interface EXTPassthroughTest : SenTestCase | ||
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| @end |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,86 @@ | ||
| // | ||
| // EXTPassthroughTest.m | ||
| // extobjc | ||
| // | ||
| // Created by Justin Spahr-Summers on 2012-07-03. | ||
| // Released into the public domain. | ||
| // | ||
|
|
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| #import "EXTPassthroughTest.h" | ||
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| @interface InnerClass : NSObject | ||
| @property (nonatomic, getter = isEnabled) BOOL enabled; | ||
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| - (void)voidMethod; | ||
| - (int)methodWithString:(NSString *)str; | ||
| - (int)methodWithString:(NSString *)str number:(NSNumber *)num; | ||
| @end | ||
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| @interface OuterClass : NSObject | ||
| @property (nonatomic, strong) InnerClass *inner; | ||
| @end | ||
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| @interface OuterClass (DelegatedMethods) | ||
| @property (nonatomic, getter = isEnabled) BOOL enabled; | ||
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| - (void)renamedMethod; | ||
| - (int)methodWithString:(NSString *)str; | ||
| - (int)methodWithString:(NSString *)str number:(NSNumber *)num; | ||
| @end | ||
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| @implementation EXTPassthroughTest | ||
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| - (void)testPassthroughMethods { | ||
| OuterClass *outer = [[OuterClass alloc] init]; | ||
| STAssertNotNil(outer, @""); | ||
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| [outer renamedMethod]; | ||
| STAssertEquals([outer methodWithString:@"foo"], 3, @""); | ||
| STAssertEquals([outer methodWithString:@"foobar" number:@5], 11, @""); | ||
| } | ||
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| - (void)testPassthroughProperty { | ||
| OuterClass *outer = [[OuterClass alloc] init]; | ||
| STAssertNotNil(outer, @""); | ||
| STAssertFalse(outer.enabled, @""); | ||
| STAssertFalse(outer.inner.enabled, @""); | ||
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| outer.enabled = YES; | ||
| STAssertTrue(outer.enabled, @""); | ||
| STAssertTrue(outer.inner.enabled, @""); | ||
| } | ||
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| @end | ||
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| @implementation OuterClass | ||
| @passthrough(OuterClass, renamedMethod, self.inner, voidMethod); | ||
| @passthrough(OuterClass, methodWithString:, self.inner); | ||
| @passthrough(OuterClass, methodWithString:number:, [self inner]); | ||
| @passthrough(OuterClass, isEnabled, self.inner); | ||
| @passthrough(OuterClass, setEnabled:, self.inner); | ||
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| - (id)init { | ||
| self = [super init]; | ||
| if (!self) | ||
| return nil; | ||
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| self.inner = [[InnerClass alloc] init]; | ||
| return self; | ||
| } | ||
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| @end | ||
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| @implementation InnerClass | ||
|
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| - (void)voidMethod { | ||
| } | ||
|
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| - (int)methodWithString:(NSString *)str { | ||
| return [self methodWithString:str number:nil]; | ||
| } | ||
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| - (int)methodWithString:(NSString *)str number:(NSNumber *)num { | ||
| return (int)[str length] + [num intValue]; | ||
| } | ||
|
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| @end |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,185 @@ | ||
| // | ||
| // EXTPassthrough.h | ||
| // extobjc | ||
| // | ||
| // Created by Justin Spahr-Summers on 2012-07-03. | ||
| // Released into the public domain. | ||
| // | ||
|
|
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| #import <Foundation/Foundation.h> | ||
| #import <objc/runtime.h> | ||
| #import "metamacros.h" | ||
|
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| /** | ||
| * \@passthrough defines \a METHOD on \a CLASS to simply invoke a method on | ||
| * another object and return the result. The object to message should be an | ||
| * expression passed as the third argument to the macro, and may refer to \c | ||
| * self (for instance, to access a property). | ||
| * | ||
| * By default, the message sent to the other object uses the same method name | ||
| * given to the macro. \a METHOD may pass through to a method by a different | ||
| * name by passing a fourth argument to the macro, which should be the name of | ||
| * the message to send. | ||
| * | ||
| * @code | ||
| // | ||
| // OuterClass.h | ||
| // | ||
| @interface OuterClass : NSObject | ||
| @end | ||
| @interface OuterClass (PassthroughMethods) | ||
| @property (nonatomic, getter = isEnabled) BOOL enabled; | ||
| - (void)renamedMethod; | ||
| - (int)methodWithString:(NSString *)str; | ||
| @end | ||
| // | ||
| // OuterClass.m | ||
| // | ||
| @interface InnerClass : NSObject | ||
| @property (nonatomic, getter = isEnabled) BOOL enabled; | ||
| - (void)voidMethod; | ||
| - (int)methodWithString:(NSString *)str; | ||
| @end | ||
| @interface OuterClass () | ||
| @property (nonatomic, strong) InnerClass *inner; | ||
| @end | ||
| @implementation OuterClass | ||
| @passthrough(OuterClass, renamedMethod, self.inner, voidMethod); | ||
| @passthrough(OuterClass, methodWithString:, self.inner); | ||
| @passthrough(OuterClass, isEnabled, self.inner); | ||
| @passthrough(OuterClass, setEnabled:, self.inner); | ||
| - (id)init { | ||
| self = [super init]; | ||
| if (!self) | ||
| return nil; | ||
| self.inner = [InnerClass new]; | ||
| return self; | ||
| } | ||
| @end | ||
| @implementation InnerClass | ||
| ... | ||
| @end | ||
| * @endcode | ||
| * | ||
| * @note \a METHOD must denote an instance method. | ||
| * | ||
| * @note To avoid "incomplete implementation" warnings, passthrough methods and | ||
| * properties may be declared in a category on \a CLASS, as opposed to the main | ||
| * \@interface block. | ||
| */ | ||
| #define passthrough(CLASS, METHOD, ...) \ | ||
| class CLASS; \ | ||
| \ | ||
| passthrough_(__COUNTER__, CLASS, METHOD, __VA_ARGS__) | ||
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| /*** implementation details follow ***/ \ | ||
| #define passthrough_(ID, CLASS, METHOD, ...) \ | ||
| static id \ | ||
| (*metamacro_concat(ext_originalMethodSignatureForSelector_, ID)) \ | ||
| (id, SEL, SEL); \ | ||
| \ | ||
| static NSMethodSignature * \ | ||
| metamacro_concat(ext_methodSignatureForSelector_, ID) \ | ||
| (CLASS *self, SEL _cmd, SEL selector) { \ | ||
| if (selector != @selector(METHOD)) \ | ||
| return metamacro_concat(ext_originalMethodSignatureForSelector_, ID)(self, _cmd, selector); \ | ||
| \ | ||
| id inner = metamacro_head(__VA_ARGS__); \ | ||
| SEL innerSelector = passthrough_renamed_method(METHOD, __VA_ARGS__); \ | ||
| return [inner methodSignatureForSelector:innerSelector]; \ | ||
| } \ | ||
| \ | ||
| static BOOL \ | ||
| (*metamacro_concat(ext_originalRespondsToSelector_, ID)) \ | ||
| (id, SEL, SEL); \ | ||
| \ | ||
| static BOOL \ | ||
| metamacro_concat(ext_respondsToSelector_, ID) \ | ||
| (CLASS *self, SEL _cmd, SEL selector) { \ | ||
| if (selector != @selector(METHOD)) \ | ||
| return metamacro_concat(ext_originalRespondsToSelector_, ID)(self, _cmd, selector); \ | ||
| \ | ||
| id inner = metamacro_head(__VA_ARGS__); \ | ||
| SEL innerSelector = passthrough_renamed_method(METHOD, __VA_ARGS__); \ | ||
| return [inner respondsToSelector:innerSelector]; \ | ||
| } \ | ||
| \ | ||
| static void \ | ||
| (*metamacro_concat(ext_originalForwardInvocation_, ID)) \ | ||
| (id, SEL, id); \ | ||
| \ | ||
| static void \ | ||
| metamacro_concat(ext_forwardInvocation_, ID) \ | ||
| (CLASS *self, SEL _cmd, NSInvocation *invocation) { \ | ||
| if (invocation.selector != @selector(METHOD)) { \ | ||
| metamacro_concat(ext_originalForwardInvocation_, ID)(self, _cmd, invocation); \ | ||
| return; \ | ||
| } \ | ||
| \ | ||
| [invocation setTarget:metamacro_head(__VA_ARGS__)]; \ | ||
| [invocation setSelector:passthrough_renamed_method(METHOD, __VA_ARGS__)]; \ | ||
| [invocation invoke]; \ | ||
| } \ | ||
| \ | ||
| __attribute__((constructor)) \ | ||
| static void metamacro_concat(ext_passthrough_injection_, ID) (void) { \ | ||
| Class outerClass = objc_getClass(# CLASS); \ | ||
| \ | ||
| Method methodSignatureForSelector = class_getInstanceMethod(outerClass, @selector(methodSignatureForSelector:)); \ | ||
| Method respondsToSelector = class_getInstanceMethod(outerClass, @selector(respondsToSelector:)); \ | ||
| Method forwardInvocation = class_getInstanceMethod(outerClass, @selector(forwardInvocation:)); \ | ||
| \ | ||
| metamacro_concat(ext_originalMethodSignatureForSelector_, ID) = \ | ||
| (id (*)(id, SEL, SEL))method_getImplementation(methodSignatureForSelector); \ | ||
| \ | ||
| metamacro_concat(ext_originalRespondsToSelector_, ID) = \ | ||
| (BOOL (*)(id, SEL, SEL))method_getImplementation(respondsToSelector); \ | ||
| \ | ||
| metamacro_concat(ext_originalForwardInvocation_, ID) = \ | ||
| (void (*)(id, SEL, id))method_getImplementation(forwardInvocation); \ | ||
| \ | ||
| class_replaceMethod( \ | ||
| outerClass, \ | ||
| @selector(methodSignatureForSelector:), \ | ||
| (IMP)&metamacro_concat(ext_methodSignatureForSelector_, ID), \ | ||
| method_getTypeEncoding(methodSignatureForSelector) \ | ||
| ); \ | ||
| \ | ||
| class_replaceMethod( \ | ||
| outerClass, \ | ||
| @selector(respondsToSelector:), \ | ||
| (IMP)&metamacro_concat(ext_respondsToSelector_, ID), \ | ||
| method_getTypeEncoding(respondsToSelector) \ | ||
| ); \ | ||
| \ | ||
| class_replaceMethod( \ | ||
| outerClass, \ | ||
| @selector(forwardInvocation:), \ | ||
| (IMP)&metamacro_concat(ext_forwardInvocation_, ID), \ | ||
| method_getTypeEncoding(forwardInvocation) \ | ||
| ); \ | ||
| } | ||
|
|
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| #define passthrough_renamed_method(METHOD, ...) \ | ||
| @selector(metamacro_if_eq(1, metamacro_argcount(__VA_ARGS__)) \ | ||
| ( \ | ||
| /* no renaming */ \ | ||
| METHOD \ | ||
| ) \ | ||
| ( \ | ||
| /* the renamed method follows the passthrough target */ \ | ||
| metamacro_at(1, __VA_ARGS__) \ | ||
| ) \ | ||
| ) |
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