Ono (斧)

A sensible way to deal with XML & HTML for iOS & Mac OS X

XML support in Cocoa isn't great (unless, of course, the XML in question is a .plist). NSXMLParser forces a cumbersome delegate model, which is extremely inconvenient to implement. NSXMLDocument is a bit nicer to use, but only works on Mac OS X, and has a large memory footprint.

Ono makes working with XML & HTML as nice as JSON.

Whether your app needs to interface with a XML-RPC webservice, scrape a website, or parse an RSS feed, Ono will make your day a whole lot less terrible.

Ono (斧) means "axe", in homage to Nokogiri (鋸), which means "saw".

Features

• Simple, modern API following standard Objective-C conventions, including extensive use of blocks and NSFastEnumeration
• Extremely performant document parsing and traversal, powered by libxml2
• Support for both XPath and CSS queries
• Automatic conversion of date and number values
• Correct, common-sense handling of XML namespaces for elements and attributes
• Ability to load HTML and XML documents from either NSString or NSData
• Full documentation
• Comprehensive test suite

Installation

CocoaPods is the recommended method of installing Ono. Simply add the following line to your Podfile:

Podfile

pod 'Ono'

Usage

#import "Ono.h"

NSData *data = ...;
NSError *error;

ONOXMLDocument *document = [ONOXMLDocument XMLDocumentWithData:data error:&error];
for (ONOXMLElement *element in document.rootElement.children) {
    NSLog(@"%@: %@", element.tag, element.attributes);
}

// Support for Namespaces
NSString *author = [[document.rootElement firstChildWithTag:@"creator" inNamespace:@"dc"] stringValue];

// Automatic Conversion for Number & Date Values
NSDate *date = [[document.rootElement firstChildWithTag:@"created_at"] dateValue]; // ISO 8601 Timestamp
NSInteger numberOfWords = [[[document.rootElement firstChildWithTag:@"word_count"] numberValue] integerValue];
BOOL isPublished = [[[document.rootElement firstChildWithTag:@"is_published"] numberValue] boolValue];

// Convenient Accessors for Attributes
NSString *unit = [document.rootElement firstChildWithTag:@"Length"][@"unit"];
NSDictionary *authorAttributes = [[document.rootElement firstChildWithTag:@"author"] attributes];

// Support for XPath & CSS Queries
[document enumerateElementsWithXPath:@"//Content" usingBlock:^(ONOXMLElement *element, NSUInteger idx, BOOL *stop) {
    NSLog(@"%@", element);
}];

Demo

Build and run the example project in Xcode to see Ono in action.

Requirements

Ono is compatible with iOS 5 and higher, as well as Mac OS X 10.7 and higher. It requires the libxml2 library, which is included automatically when installed with CocoaPods, or can be added manually by adding "libxml2.dylib" to the target's "Link Binary With Libraries" build phase.

Contact

Mattt

License

Ono is available under the MIT license. See the LICENSE file for more info.