react-native/React/Base/RCTUtils.h

/**
 * 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 <tgmath.h>

#import <CoreGraphics/CoreGraphics.h>
#import <Foundation/Foundation.h>

#import "RCTAssert.h"

#ifdef __cplusplus
extern "C" {
#endif

// Utility functions for JSON object <-> string serialization/deserialization
NSString *RCTJSONStringify(id jsonObject, NSError **error);
id RCTJSONParse(NSString *jsonString, NSError **error);

// Get MD5 hash of a string (TODO: currently unused. Remove?)
NSString *RCTMD5Hash(NSString *string);

// Get screen metrics in a thread-safe way
CGFloat RCTScreenScale(void);
CGSize RCTScreenSize(void);

// Round float coordinates to nearest whole screen pixel (not point)
CGFloat RCTRoundPixelValue(CGFloat value);
CGFloat RCTCeilPixelValue(CGFloat value);
CGFloat RCTFloorPixelValue(CGFloat value);

// Get current time, for precise performance metrics
NSTimeInterval RCTTGetAbsoluteTime(void);

// Method swizzling
void RCTSwapClassMethods(Class cls, SEL original, SEL replacement);
void RCTSwapInstanceMethods(Class cls, SEL original, SEL replacement);

// Module subclass support
BOOL RCTClassOverridesClassMethod(Class cls, SEL selector);
BOOL RCTClassOverridesInstanceMethod(Class cls, SEL selector);

// Enumerate all classes that conform to NSObject protocol
void RCTEnumerateClasses(void (^block)(Class cls));

// Creates a standardized error object
// TODO(#6472857): create NSErrors and automatically convert them over the bridge.
NSDictionary *RCTMakeError(NSString *message, id toStringify, NSDictionary *extraData);
NSDictionary *RCTMakeAndLogError(NSString *message, id toStringify, NSDictionary *extraData);

#ifdef __cplusplus
}
#endif