iOS JSCore的一些思考

JSCore的头文件中 有一些面向C的类和函数

• 原生值转换JS

JSValueRef NSObjectToJSValue( JSContextRef ctx, NSObject *obj ) {
    JSValueRef ret = NULL;
    
    // String
    if ([obj isKindOfClass:NSString.class]) {
        JSStringRef jstr = JSStringCreateWithCFString((CFStringRef)(NSString *)obj);
        ret = JSValueMakeString(ctx, jstr);
        JSStringRelease(jstr);
    }
    
    // Number or Bool
    else if ([obj isKindOfClass:NSNumber.class]) {
        NSNumber *number = (NSNumber *)obj;
        if( strcmp(number.objCType, @encode(BOOL)) == 0 ) {
            ret = JSValueMakeBoolean(ctx, number.boolValue);
        }
        else {
            ret = JSValueMakeNumber(ctx, number.doubleValue);
        }
    }
    
    // Date
    else if ([obj isKindOfClass:NSDate.class]) {
        NSDate *date = (NSDate *)obj;
        JSValueRef timestamp = JSValueMakeNumber(ctx, date.timeIntervalSince1970 * 1000.0);
        ret = JSObjectMakeDate(ctx, 1, &timestamp, NULL);
    }
    
    // Array
    else if ([obj isKindOfClass:NSArray.class]) {
        NSArray *array = (NSArray *)obj;
        JSValueRef *args = malloc(array.count * sizeof(JSValueRef));
        for( int i = 0; i < array.count; i++ ) {
            args[i] = NSObjectToJSValue(ctx, array[i] );
        }
        ret = JSObjectMakeArray(ctx, array.count, args, NULL);
        free(args);
    }
    
    // Dictionary
    else if ([obj isKindOfClass:NSDictionary.class]) {
        NSDictionary *dict = (NSDictionary *)obj;
        ret = JSObjectMake(ctx, NULL, NULL);
        for( NSString *key in dict ) {
            JSStringRef jsKey = JSStringCreateWithUTF8CString(key.UTF8String);
            JSValueRef value = NSObjectToJSValue(ctx, dict[key]);
            JSObjectSetProperty(ctx, (JSObjectRef)ret, jsKey, value, kJSPropertyAttributeNone, NULL);
            JSStringRelease(jsKey);
        }
    }
    
    return ret ? ret : JSValueMakeNull(ctx);
}