ios/Pods/WeexSDK/ios/sdk/WeexSDK/Sources/Bridge/WXBridgeMethod.m

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

#import "WXBridgeMethod.h"
#import "WXSDKInstance.h"
#import "WXMonitor.h"
#import "WXAssert.h"
#import "WXUtility.h"
#import "WXSDKManager.h"
#import <objc/runtime.h>
#import "WXConvert.h"

@implementation WXBridgeMethod

- (instancetype)initWithMethodName:(NSString *)methodName arguments:(NSArray *)arguments instance:(WXSDKInstance *)instance
{
    if (self = [super init]) {
        _methodName = methodName;
        _arguments = [NSMutableArray arrayWithArray:arguments];
        _instance = instance;
    }
    
    return self;
}

- (NSString *)description
{
    return [NSString stringWithFormat:@"<%@: %p; instance = %@; method = %@; arguments= %@>", NSStringFromClass([self class]), self, _instance.instanceId, _methodName, _arguments];
}

//check parameter:NSNumber contains int,float,double;object contains nsarray,nsstring,nsdictionary ;block is block
//https://developer.apple.com/library/content/documentation/Cocoa/Conceptual/ObjCRuntimeGuide/Articles/ocrtTypeEncodings.html
-(id)parseArgument:(id)obj parameterType:(const char *)parameterType order:(int)order
{
#ifdef DEBUG
    BOOL check = YES;
#endif
    if (strcmp(parameterType,@encode(float))==0 || strcmp(parameterType,@encode(double))==0)
    {
#ifdef DEBUG
        check =  [obj isKindOfClass:[NSNumber class]];
        if(!check){
            NSLog(@"<%@: %p; instance = %@; method = %@; arguments= %@; the number %d parameter type is not right,it should be float or double>",NSStringFromClass([self class]), self, _instance.instanceId, _methodName, _arguments,order);
        }
#endif
        CGFloat value = [WXConvert CGFloat:obj];
        return [NSNumber numberWithDouble:value];
    } else if (strcmp(parameterType,@encode(int))==0) {
#ifdef DEBUG
        check =  [obj isKindOfClass:[NSNumber class]];
        if(!check){
            NSLog(@"<%@: %p; instance = %@; method = %@; arguments= %@; the number %d parameter type is not right,it should be int>",NSStringFromClass([self class]), self, _instance.instanceId, _methodName, _arguments,order);
        }
#endif
        NSInteger value = [WXConvert NSInteger:obj];
        return [NSNumber numberWithInteger:value];
    } else if(strcmp(parameterType,@encode(id))==0) {
#ifdef DEBUG
        check =  [obj isKindOfClass:[NSArray class]] || [obj isKindOfClass:[NSDictionary class]] ||[obj isKindOfClass:[NSString class]];
        if(!check){
            NSLog(@"<%@: %p; instance = %@; method = %@; arguments= %@ ;the number %d parameter type is not right,it should be array ,map or string>",NSStringFromClass([self class]), self, _instance.instanceId, _methodName, _arguments,order);
        }
#endif
        return obj;
    } else if(strcmp(parameterType,@encode(typeof(^{})))==0) {
#ifdef DEBUG
        check =  [obj isKindOfClass:[NSString class]]; // jsfm pass string if parameter type is block
        if(!check){
            NSLog(@"<%@: %p; instance = %@; method = %@; arguments= %@; the number %d parameter type is not right,it should be block>",NSStringFromClass([self class]), self, _instance.instanceId, _methodName, _arguments,order);
        }
#endif
        return obj;
    }
    return obj;
}

- (NSInvocation *)invocationWithTarget:(id)target selector:(SEL)selector
{
    WXAssert(target, @"No target for method:%@", self);
    WXAssert(selector, @"No selector for method:%@", self);
    
    NSMethodSignature *signature = [target methodSignatureForSelector:selector];
    if (!signature) {
        NSString *errorMessage = [NSString stringWithFormat:@"target:%@, selector:%@ doesn't have a method signature", target, NSStringFromSelector(selector)];
        WX_MONITOR_FAIL(WXMTJSBridge, WX_ERR_INVOKE_NATIVE, errorMessage);
        return nil;
    }
    
    NSUInteger redundantArgumentCount = 0;
    NSArray *arguments = _arguments;
    if (signature.numberOfArguments - 2 < arguments.count) {
        redundantArgumentCount = arguments.count - (signature.numberOfArguments - 2); // JS provides more arguments than required.
    }
    
    NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:signature];
    invocation.target = target;
    invocation.selector = selector;
    NSString *instanceId = _instance.instanceId;
    void **freeList = NULL;
    
    NSMutableArray *blockArray = [NSMutableArray array];
    WX_ALLOC_FLIST(freeList, arguments.count - redundantArgumentCount);
    for (int i = 0; i < arguments.count - redundantArgumentCount; i ++ ) {
        id obj = arguments[i];
        const char *parameterType = [signature getArgumentTypeAtIndex:i + 2];
        obj = [self parseArgument:obj parameterType:parameterType order:i];
        static const char *blockType = @encode(typeof(^{}));
        id argument;
        if (!strcmp(parameterType, blockType)) {
            // callback
            argument = [^void(NSString *result, BOOL keepAlive) {
                [[WXSDKManager bridgeMgr] callBack:instanceId funcId:(NSString *)obj params:result keepAlive:keepAlive];
            } copy];
            
            // retain block
            [blockArray addObject:argument];
            [invocation setArgument:&argument atIndex:i + 2];
        } else {
            argument = obj;
            WX_ARGUMENTS_SET(invocation, signature, i, argument, freeList);
        }
    }
    [invocation retainArguments];
    WX_FREE_FLIST(freeList, arguments.count - redundantArgumentCount);
    
    return invocation;
}

@end