Xml in Objective-C

Here’s the translation of the XML example from Go to Objective-C:

Our first program will demonstrate XML parsing and generation. Here’s the full source code.

#import <Foundation/Foundation.h>

@interface Plant : NSObject <NSXMLParserDelegate>

@property (nonatomic, assign) NSInteger plantId;
@property (nonatomic, strong) NSString *name;
@property (nonatomic, strong) NSMutableArray *origin;

- (NSString *)description;
- (NSString *)toXMLString;

@end

@implementation Plant

- (instancetype)init {
    self = [super init];
    if (self) {
        _origin = [NSMutableArray array];
    }
    return self;
}

- (NSString *)description {
    return [NSString stringWithFormat:@"Plant id=%ld, name=%@, origin=%@",
            (long)self.plantId, self.name, self.origin];
}

- (NSString *)toXMLString {
    NSMutableString *xml = [NSMutableString string];
    [xml appendFormat:@"<plant id=\"%ld\">\n", (long)self.plantId];
    [xml appendFormat:@"  <name>%@</name>\n", self.name];
    for (NSString *origin in self.origin) {
        [xml appendFormat:@"  <origin>%@</origin>\n", origin];
    }
    [xml appendString:@"</plant>"];
    return xml;
}

@end

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        Plant *coffee = [[Plant alloc] init];
        coffee.plantId = 27;
        coffee.name = @"Coffee";
        [coffee.origin addObjectsFromArray:@[@"Ethiopia", @"Brazil"]];
        
        NSString *xmlString = [coffee toXMLString];
        NSLog(@"%@", xmlString);
        
        NSLog(@"%@", [@"<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n" stringByAppendingString:xmlString]);
        
        // Parsing XML is more complex in Objective-C and requires NSXMLParser
        // This is a simplified example and doesn't handle all cases
        NSData *xmlData = [xmlString dataUsingEncoding:NSUTF8StringEncoding];
        NSXMLParser *parser = [[NSXMLParser alloc] initWithData:xmlData];
        Plant *parsedPlant = [[Plant alloc] init];
        [parser setDelegate:parsedPlant];
        [parser parse];
        
        NSLog(@"%@", parsedPlant);
        
        Plant *tomato = [[Plant alloc] init];
        tomato.plantId = 81;
        tomato.name = @"Tomato";
        [tomato.origin addObjectsFromArray:@[@"Mexico", @"California"]];
        
        NSMutableString *nestingXML = [NSMutableString string];
        [nestingXML appendString:@"<nesting>\n"];
        [nestingXML appendString:@"  <parent>\n"];
        [nestingXML appendString:@"    <child>\n"];
        [nestingXML appendString:[coffee toXMLString]];
        [nestingXML appendString:@"\n"];
        [nestingXML appendString:[tomato toXMLString]];
        [nestingXML appendString:@"\n"];
        [nestingXML appendString:@"    </child>\n"];
        [nestingXML appendString:@"  </parent>\n"];
        [nestingXML appendString:@"</nesting>"];
        
        NSLog(@"%@", nestingXML);
    }
    return 0;
}

This Objective-C code demonstrates XML handling, although it’s more verbose and complex compared to the original example. Objective-C doesn’t have built-in XML support as extensive as Go’s, so we’ve used a combination of string manipulation for XML generation and NSXMLParser for parsing.

The Plant class represents our data structure, with methods to convert to XML and parse from XML. The main function demonstrates creating Plant objects, generating XML, and a simplified XML parsing process.

Note that this example is simplified and doesn’t handle all XML cases or error scenarios. In a real-world application, you might want to use a more robust XML library or implement more comprehensive XML handling.

To run the program, compile it with the Objective-C compiler and execute the resulting binary:

$ clang -framework Foundation xml_example.m -o xml_example
$ ./xml_example

This will output the XML representations and parsed data as demonstrated in the original example.

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