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Support for Swift Package Manager #174

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7 changes: 7 additions & 0 deletions .swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata

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28 changes: 28 additions & 0 deletions Package.swift
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// swift-tools-version:5.2
// The swift-tools-version declares the minimum version of Swift required to build this package.

import PackageDescription

let package = Package(
name: "Aspects",
products: [
// Products define the executables and libraries produced by a package, and make them visible to other packages.
.library(
name: "Aspects",
targets: ["Aspects"]),
],
dependencies: [
// Dependencies declare other packages that this package depends on.
// .package(url: /* package url */, from: "1.0.0"),
],
targets: [
// Targets are the basic building blocks of a package. A target can define a module or a test suite.
// Targets can depend on other targets in this package, and on products in packages which this package depends on.
.target(
name: "Aspects",
dependencies: []),
.testTarget(
name: "AspectsTests",
dependencies: ["Aspects"]),
]
)
83 changes: 83 additions & 0 deletions Sources/Aspects/Aspects.h
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//
// Aspects.h
// Aspects - A delightful, simple library for aspect oriented programming.
//
// Copyright (c) 2014 Peter Steinberger. Licensed under the MIT license.
//

#import <Foundation/Foundation.h>

typedef NS_OPTIONS(NSUInteger, AspectOptions) {
AspectPositionAfter = 0, /// Called after the original implementation (default)
AspectPositionInstead = 1, /// Will replace the original implementation.
AspectPositionBefore = 2, /// Called before the original implementation.

AspectOptionAutomaticRemoval = 1 << 3 /// Will remove the hook after the first execution.
};

/// Opaque Aspect Token that allows to deregister the hook.
@protocol AspectToken <NSObject>

/// Deregisters an aspect.
/// @return YES if deregistration is successful, otherwise NO.
- (BOOL)remove;

@end

/// The AspectInfo protocol is the first parameter of our block syntax.
@protocol AspectInfo <NSObject>

/// The instance that is currently hooked.
- (id)instance;

/// The original invocation of the hooked method.
- (NSInvocation *)originalInvocation;

/// All method arguments, boxed. This is lazily evaluated.
- (NSArray *)arguments;

@end

/**
Aspects uses Objective-C message forwarding to hook into messages. This will create some overhead. Don't add aspects to methods that are called a lot. Aspects is meant for view/controller code that is not called a 1000 times per second.

Adding aspects returns an opaque token which can be used to deregister again. All calls are thread safe.
*/
@interface NSObject (Aspects)

/// Adds a block of code before/instead/after the current `selector` for a specific class.
///
/// @param block Aspects replicates the type signature of the method being hooked.
/// The first parameter will be `id<AspectInfo>`, followed by all parameters of the method.
/// These parameters are optional and will be filled to match the block signature.
/// You can even use an empty block, or one that simple gets `id<AspectInfo>`.
///
/// @note Hooking static methods is not supported.
/// @return A token which allows to later deregister the aspect.
+ (id<AspectToken>)aspect_hookSelector:(SEL)selector
withOptions:(AspectOptions)options
usingBlock:(id)block
error:(NSError **)error;

/// Adds a block of code before/instead/after the current `selector` for a specific instance.
- (id<AspectToken>)aspect_hookSelector:(SEL)selector
withOptions:(AspectOptions)options
usingBlock:(id)block
error:(NSError **)error;

@end


typedef NS_ENUM(NSUInteger, AspectErrorCode) {
AspectErrorSelectorBlacklisted, /// Selectors like release, retain, autorelease are blacklisted.
AspectErrorDoesNotRespondToSelector, /// Selector could not be found.
AspectErrorSelectorDeallocPosition, /// When hooking dealloc, only AspectPositionBefore is allowed.
AspectErrorSelectorAlreadyHookedInClassHierarchy, /// Statically hooking the same method in subclasses is not allowed.
AspectErrorFailedToAllocateClassPair, /// The runtime failed creating a class pair.
AspectErrorMissingBlockSignature, /// The block misses compile time signature info and can't be called.
AspectErrorIncompatibleBlockSignature, /// The block signature does not match the method or is too large.

AspectErrorRemoveObjectAlreadyDeallocated = 100 /// (for removing) The object hooked is already deallocated.
};

extern NSString *const AspectErrorDomain;
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