react-native/React/Base/RCTAssert.h

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/**
* Copyright (c) 2015-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*/
#import <Foundation/Foundation.h>
#import <React/RCTDefines.h>
/*
* Defined in RCTUtils.m
*/
RCT_EXTERN BOOL RCTIsMainQueue(void);
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/**
* This is the main assert macro that you should use. Asserts should be compiled out
* in production builds. You can customize the assert behaviour by setting a custom
* assert handler through `RCTSetAssertFunction`.
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*/
#ifndef NS_BLOCK_ASSERTIONS
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#define RCTAssert(condition, ...) do { \
if ((condition) == 0) { \
_RCTAssertFormat(#condition, __FILE__, __LINE__, __func__, __VA_ARGS__); \
if (RCT_NSASSERT) { \
[[NSAssertionHandler currentHandler] handleFailureInFunction:@(__func__) \
file:@(__FILE__) lineNumber:__LINE__ description:__VA_ARGS__]; \
} \
} \
} while (false)
#else
#define RCTAssert(condition, ...) do {} while (false)
#endif
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RCT_EXTERN void _RCTAssertFormat(
const char *, const char *, int, const char *, NSString *, ...
) NS_FORMAT_FUNCTION(5,6);
/**
* Report a fatal condition when executing. These calls will _NOT_ be compiled out
* in production, and crash the app by default. You can customize the fatal behaviour
* by setting a custom fatal handler through `RCTSetFatalHandler`.
*/
RCT_EXTERN void RCTFatal(NSError *error);
/**
* The default error domain to be used for React errors.
*/
RCT_EXTERN NSString *const RCTErrorDomain;
/**
* JS Stack trace provided as part of an NSError's userInfo
*/
RCT_EXTERN NSString *const RCTJSStackTraceKey;
/**
* Raw JS Stack trace string provided as part of an NSError's userInfo
*/
RCT_EXTERN NSString *const RCTJSRawStackTraceKey;
/**
* Name of fatal exceptions generated by RCTFatal
*/
RCT_EXTERN NSString *const RCTFatalExceptionName;
/**
* A block signature to be used for custom assertion handling.
*/
typedef void (^RCTAssertFunction)(NSString *condition,
NSString *fileName,
NSNumber *lineNumber,
NSString *function,
NSString *message);
typedef void (^RCTFatalHandler)(NSError *error);
/**
* Convenience macro for asserting that a parameter is non-nil/non-zero.
*/
#define RCTAssertParam(name) RCTAssert(name, @"'%s' is a required parameter", #name)
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/**
* Convenience macro for asserting that we're running on main queue.
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*/
#define RCTAssertMainQueue() RCTAssert(RCTIsMainQueue(), \
@"This function must be called on the main queue")
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/**
* Convenience macro for asserting that we're running off the main queue.
*/
#define RCTAssertNotMainQueue() RCTAssert(!RCTIsMainQueue(), \
@"This function must not be called on the main queue")
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/**
* These methods get and set the current assert function called by the RCTAssert
* macros. You can use these to replace the standard behavior with custom assert
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* functionality.
*/
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RCT_EXTERN void RCTSetAssertFunction(RCTAssertFunction assertFunction);
RCT_EXTERN RCTAssertFunction RCTGetAssertFunction(void);
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/**
* This appends additional code to the existing assert function, without
* replacing the existing functionality. Useful if you just want to forward
* assert info to an extra service without changing the default behavior.
*/
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RCT_EXTERN void RCTAddAssertFunction(RCTAssertFunction assertFunction);
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/**
* This method temporarily overrides the assert function while performing the
* specified block. This is useful for testing purposes (to detect if a given
* function asserts something) or to suppress or override assertions temporarily.
*/
RCT_EXTERN void RCTPerformBlockWithAssertFunction(void (^block)(void), RCTAssertFunction assertFunction);
/**
These methods get and set the current fatal handler called by the RCTFatal method.
*/
RCT_EXTERN void RCTSetFatalHandler(RCTFatalHandler fatalHandler);
RCT_EXTERN RCTFatalHandler RCTGetFatalHandler(void);
/**
* Get the current thread's name (or the current queue, if in debug mode)
*/
RCT_EXTERN NSString *RCTCurrentThreadName(void);
/**
* Helper to get generate exception message from NSError
*/
RCT_EXTERN NSString *RCTFormatError(NSString *message, NSArray<NSDictionary<NSString *, id> *> *stacktrace, NSUInteger maxMessageLength);
/**
* Convenience macro to assert which thread is currently running (DEBUG mode only)
*/
#if DEBUG
#define RCTAssertThread(thread, format...) \
_Pragma("clang diagnostic push") \
_Pragma("clang diagnostic ignored \"-Wdeprecated-declarations\"") \
RCTAssert( \
[(id)thread isKindOfClass:[NSString class]] ? \
[RCTCurrentThreadName() isEqualToString:(NSString *)thread] : \
[(id)thread isKindOfClass:[NSThread class]] ? \
[NSThread currentThread] == (NSThread *)thread : \
dispatch_get_current_queue() == (dispatch_queue_t)thread, \
format); \
_Pragma("clang diagnostic pop")
#else
#define RCTAssertThread(thread, format...) do { } while (0)
#endif