330 lines
13 KiB
Objective-C
330 lines
13 KiB
Objective-C
/**
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* Copyright (c) 2015-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*/
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#import "RCTModuleMethod.h"
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#import <objc/message.h>
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#import "RCTAssert.h"
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#import "RCTBridge.h"
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#import "RCTConvert.h"
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#import "RCTLog.h"
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#import "RCTUtils.h"
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@interface RCTBridge (RCTModuleMethod)
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- (void)_invokeAndProcessModule:(NSString *)module
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method:(NSString *)method
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arguments:(NSArray *)args;
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@end
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@implementation RCTModuleMethod
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{
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Class _moduleClass;
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SEL _selector;
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NSMethodSignature *_methodSignature;
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NSArray *_argumentBlocks;
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}
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RCT_NOT_IMPLEMENTED(-init)
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void RCTParseObjCMethodName(NSString **, NSArray **);
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void RCTParseObjCMethodName(NSString **objCMethodName, NSArray **argTypes)
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{
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static NSRegularExpression *typeNameRegex;
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static dispatch_once_t onceToken;
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dispatch_once(&onceToken, ^{
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NSString *unusedPattern = @"(?:__unused|__attribute__\\(\\(unused\\)\\))";
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NSString *constPattern = @"(?:const)";
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NSString *nullabilityPattern = @"(?:__nullable|__nonnull|nullable|nonnull|__attribute__\\(\\(nonnull\\)\\)|__attribute__\\(\\(nullable\\)\\))";
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NSString *annotationPattern = [NSString stringWithFormat:@"(?:(?:%@|%@|%@)\\s*)",
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unusedPattern, constPattern, nullabilityPattern];
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NSString *pattern = [NSString stringWithFormat:@"(?<=:)(\\s*\\(%1$@?(\\w+?)(?:\\s*\\*)?%1$@?\\))?\\s*\\w+",
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annotationPattern];
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typeNameRegex = [[NSRegularExpression alloc] initWithPattern:pattern options:0 error:NULL];
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});
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// Extract argument types
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NSString *methodName = *objCMethodName;
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NSRange methodRange = {0, methodName.length};
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NSMutableArray *arguments = [NSMutableArray array];
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[typeNameRegex enumerateMatchesInString:methodName options:0 range:methodRange usingBlock:^(NSTextCheckingResult *result, __unused NSMatchingFlags flags, __unused BOOL *stop) {
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NSRange range = [result rangeAtIndex:2];
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[arguments addObject:range.length ? [methodName substringWithRange:range] : @"id"];
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}];
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*argTypes = [arguments copy];
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// Remove the parameter types and names
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methodName = [typeNameRegex stringByReplacingMatchesInString:methodName options:0
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range:methodRange
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withTemplate:@""];
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// Remove whitespace
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methodName = [methodName stringByReplacingOccurrencesOfString:@"\n" withString:@""];
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methodName = [methodName stringByReplacingOccurrencesOfString:@" " withString:@""];
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// Strip trailing semicolon
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if ([methodName hasSuffix:@";"]) {
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methodName = [methodName substringToIndex:methodName.length - 1];
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}
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*objCMethodName = methodName;
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}
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- (instancetype)initWithObjCMethodName:(NSString *)objCMethodName
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JSMethodName:(NSString *)JSMethodName
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moduleClass:(Class)moduleClass
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{
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if ((self = [super init])) {
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NSArray *argTypes;
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RCTParseObjCMethodName(&objCMethodName, &argTypes);
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_moduleClass = moduleClass;
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_selector = NSSelectorFromString(objCMethodName);
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RCTAssert(_selector, @"%@ is not a valid selector", objCMethodName);
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_JSMethodName = JSMethodName.length > 0 ? JSMethodName : ({
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NSString *methodName = objCMethodName;
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NSRange colonRange = [methodName rangeOfString:@":"];
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if (colonRange.location != NSNotFound) {
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methodName = [methodName substringToIndex:colonRange.location];
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}
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RCTAssert(methodName.length, @"%@ is not a valid JS function name, please"
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" supply an alternative using RCT_REMAP_METHOD()", objCMethodName);
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methodName;
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});
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// Get method signature
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_methodSignature = [_moduleClass instanceMethodSignatureForSelector:_selector];
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// Process arguments
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NSUInteger numberOfArguments = _methodSignature.numberOfArguments;
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NSMutableArray *argumentBlocks = [[NSMutableArray alloc] initWithCapacity:numberOfArguments - 2];
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#define RCT_ARG_BLOCK(_logic) \
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[argumentBlocks addObject:^(__unused RCTBridge *bridge, NSInvocation *invocation, NSUInteger index, id json) { \
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_logic \
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[invocation setArgument:&value atIndex:index]; \
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}];
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void (^addBlockArgument)(void) = ^{
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RCT_ARG_BLOCK(
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if (RCT_DEBUG && json && ![json isKindOfClass:[NSNumber class]]) {
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RCTLogError(@"Argument %tu (%@) of %@.%@ should be a number", index,
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json, RCTBridgeModuleNameForClass(_moduleClass), _JSMethodName);
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return;
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}
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// Marked as autoreleasing, because NSInvocation doesn't retain arguments
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__autoreleasing id value = (json ? ^(NSArray *args) {
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[bridge _invokeAndProcessModule:@"BatchedBridge"
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method:@"invokeCallbackAndReturnFlushedQueue"
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arguments:@[json, args]];
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} : ^(__unused NSArray *unused) {});
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)
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};
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void (^defaultCase)(const char *) = ^(const char *argumentType) {
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static const char *blockType = @encode(typeof(^{}));
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if (!strcmp(argumentType, blockType)) {
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addBlockArgument();
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} else {
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RCT_ARG_BLOCK( id value = json; )
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}
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};
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for (NSUInteger i = 2; i < numberOfArguments; i++) {
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const char *argumentType = [_methodSignature getArgumentTypeAtIndex:i];
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NSString *selName = argTypes[i - 2];
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SEL selector = NSSelectorFromString([selName stringByAppendingString:@":"]);
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if ([RCTConvert respondsToSelector:selector]) {
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switch (argumentType[0]) {
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#define RCT_CONVERT_CASE(_value, _type) \
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case _value: { \
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_type (*convert)(id, SEL, id) = (typeof(convert))objc_msgSend; \
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RCT_ARG_BLOCK( _type value = convert([RCTConvert class], selector, json); ) \
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break; \
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}
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RCT_CONVERT_CASE(':', SEL)
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RCT_CONVERT_CASE('*', const char *)
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RCT_CONVERT_CASE('c', char)
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RCT_CONVERT_CASE('C', unsigned char)
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RCT_CONVERT_CASE('s', short)
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RCT_CONVERT_CASE('S', unsigned short)
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RCT_CONVERT_CASE('i', int)
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RCT_CONVERT_CASE('I', unsigned int)
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RCT_CONVERT_CASE('l', long)
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RCT_CONVERT_CASE('L', unsigned long)
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RCT_CONVERT_CASE('q', long long)
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RCT_CONVERT_CASE('Q', unsigned long long)
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RCT_CONVERT_CASE('f', float)
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RCT_CONVERT_CASE('d', double)
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RCT_CONVERT_CASE('B', BOOL)
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RCT_CONVERT_CASE('@', id)
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RCT_CONVERT_CASE('^', void *)
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case '{': {
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[argumentBlocks addObject:^(__unused RCTBridge *bridge, NSInvocation *invocation, NSUInteger index, id json) {
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NSMethodSignature *methodSignature = [RCTConvert methodSignatureForSelector:selector];
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void *returnValue = malloc(methodSignature.methodReturnLength);
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NSInvocation *_invocation = [NSInvocation invocationWithMethodSignature:methodSignature];
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[_invocation setTarget:[RCTConvert class]];
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[_invocation setSelector:selector];
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[_invocation setArgument:&json atIndex:2];
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[_invocation invoke];
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[_invocation getReturnValue:returnValue];
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[invocation setArgument:returnValue atIndex:index];
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free(returnValue);
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}];
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break;
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}
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default:
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defaultCase(argumentType);
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}
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} else if ([selName isEqualToString:@"RCTResponseSenderBlock"]) {
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addBlockArgument();
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} else if ([selName isEqualToString:@"RCTResponseErrorBlock"]) {
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RCT_ARG_BLOCK(
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if (RCT_DEBUG && json && ![json isKindOfClass:[NSNumber class]]) {
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RCTLogError(@"Argument %tu (%@) of %@.%@ should be a number", index,
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json, RCTBridgeModuleNameForClass(_moduleClass), _JSMethodName);
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return;
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}
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// Marked as autoreleasing, because NSInvocation doesn't retain arguments
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__autoreleasing id value = (json ? ^(NSError *error) {
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[bridge _invokeAndProcessModule:@"BatchedBridge"
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method:@"invokeCallbackAndReturnFlushedQueue"
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arguments:@[json, @[RCTJSErrorFromNSError(error)]]];
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} : ^(__unused NSError *error) {});
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)
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} else if ([selName isEqualToString:@"RCTPromiseResolveBlock"]) {
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RCTAssert(i == numberOfArguments - 2,
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@"The RCTPromiseResolveBlock must be the second to last parameter in -[%@ %@]",
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_moduleClass, objCMethodName);
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RCT_ARG_BLOCK(
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if (RCT_DEBUG && ![json isKindOfClass:[NSNumber class]]) {
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RCTLogError(@"Argument %tu (%@) of %@.%@ must be a promise resolver ID", index,
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json, RCTBridgeModuleNameForClass(_moduleClass), _JSMethodName);
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return;
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}
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// Marked as autoreleasing, because NSInvocation doesn't retain arguments
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__autoreleasing RCTPromiseResolveBlock value = (^(id result) {
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NSArray *arguments = result ? @[result] : @[];
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[bridge _invokeAndProcessModule:@"BatchedBridge"
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method:@"invokeCallbackAndReturnFlushedQueue"
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arguments:@[json, arguments]];
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});
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)
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_functionKind = RCTJavaScriptFunctionKindAsync;
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} else if ([selName isEqualToString:@"RCTPromiseRejectBlock"]) {
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RCTAssert(i == numberOfArguments - 1,
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@"The RCTPromiseRejectBlock must be the last parameter in -[%@ %@]",
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_moduleClass, objCMethodName);
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RCT_ARG_BLOCK(
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if (RCT_DEBUG && ![json isKindOfClass:[NSNumber class]]) {
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RCTLogError(@"Argument %tu (%@) of %@.%@ must be a promise rejecter ID", index,
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json, RCTBridgeModuleNameForClass(_moduleClass), _JSMethodName);
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return;
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}
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// Marked as autoreleasing, because NSInvocation doesn't retain arguments
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__autoreleasing RCTPromiseRejectBlock value = (^(NSError *error) {
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NSDictionary *errorJSON = RCTJSErrorFromNSError(error);
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[bridge _invokeAndProcessModule:@"BatchedBridge"
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method:@"invokeCallbackAndReturnFlushedQueue"
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arguments:@[json, @[errorJSON]]];
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});
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)
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_functionKind = RCTJavaScriptFunctionKindAsync;
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} else {
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// Unknown argument type
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RCTLogError(@"Unknown argument type '%@' in method %@. Extend RCTConvert"
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" to support this type.", selName, [self methodName]);
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}
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}
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_argumentBlocks = [argumentBlocks copy];
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}
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return self;
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}
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- (void)invokeWithBridge:(RCTBridge *)bridge
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module:(id)module
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arguments:(NSArray *)arguments
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{
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if (RCT_DEBUG) {
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// Sanity check
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RCTAssert([module class] == _moduleClass, @"Attempted to invoke method \
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%@ on a module of class %@", [self methodName], [module class]);
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// Safety check
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if (arguments.count != _argumentBlocks.count) {
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NSInteger actualCount = arguments.count;
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NSInteger expectedCount = _argumentBlocks.count;
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// Subtract the implicit Promise resolver and rejecter functions for implementations of async functions
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if (_functionKind == RCTJavaScriptFunctionKindAsync) {
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actualCount -= 2;
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expectedCount -= 2;
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}
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RCTLogError(@"%@.%@ was called with %zd arguments, but expects %zd",
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RCTBridgeModuleNameForClass(_moduleClass), _JSMethodName,
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actualCount, expectedCount);
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return;
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}
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}
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// Create invocation (we can't re-use this as it wouldn't be thread-safe)
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NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:_methodSignature];
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[invocation setArgument:&_selector atIndex:1];
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[invocation retainArguments];
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// Set arguments
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NSUInteger index = 0;
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for (id json in arguments) {
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id arg = RCTNilIfNull(json);
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void (^block)(RCTBridge *, NSInvocation *, NSUInteger, id) = _argumentBlocks[index];
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block(bridge, invocation, index + 2, arg);
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index++;
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}
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// Invoke method
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[invocation invokeWithTarget:module];
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}
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- (NSString *)methodName
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{
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return [NSString stringWithFormat:@"-[%@ %@]", _moduleClass,
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NSStringFromSelector(_selector)];
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}
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- (NSString *)description
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{
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return [NSString stringWithFormat:@"<%@: %p; exports %@ as %@();>",
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[self class], self, [self methodName], _JSMethodName];
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}
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@end
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