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开源软件名称：nolanw/HTMLReader开源软件地址：https://github.com/nolanw/HTMLReader开源编程语言：Objective-C 98.2%开源软件介绍：HTMLReaderA WHATWG-compliant HTML parser with CSS selectors in Objective-C and Foundation. It parses HTML just like a browser. UsageA quick example of parsing an inline document and finding the bold text: import HTMLReader
let document = HTMLDocument(string: """
<p>
Ahoy there, <b>sailor</b>!
</p>
""")
print(document.firstNode(matchingSelector: "b")?.textContent ?? "")
// => sailorManipulating a document is a little more involved, but entirely doable. Here we take the document from the first example and wrap the paragraph within a new element: if
let p = document.firstNode(matchingSelector: "p"),
let parent = p.parent
{
let wrapper = HTMLElement(tagName: "div", attributes: ["class": "special"])
let children = parent.mutableChildren
children.insert(wrapper, at: children.index(of: p))
p.parent = wrapper
}
print(document.innerHTML)
// => <html><head></head><body><div class="special"><p>\
// Ahoy there, <b>sailor</b>!\
// </p></div></body></html>You can save a document as a file: let serialized = document.serializedFragment
let temp = FileManager.default.temporaryDirectory
let fileURL = temp.appendPathComponent("nifty.html", isDirectory: false)
do {
try serialized.write(to: fileURL, atomically: true, encoding: .utf8)
} catch {
print("Could not save nifty document", error)
}Finally, the most involved example: fetching the main page for the HTMLReader repository and scraping the description of the project. (This is just an example; GitHub has a fabulous API that you should use if you want to find a repository's description!) @import HTMLReader;
// Load a web page.
NSURL *url = [NSURL URLWithString:@"https://github.com/nolanw/HTMLReader"];
NSURLSession *session = [NSURLSession sharedSession];
[[session dataTaskWithURL:url completionHandler:
^(NSData *data, NSURLResponse *response, NSError *error) {
NSString *contentType = nil;
if ([response isKindOfClass:[NSHTTPURLResponse class]]) {
NSDictionary *headers = [(NSHTTPURLResponse *)response allHeaderFields];
contentType = headers[@"Content-Type"];
}
HTMLDocument *home = [HTMLDocument documentWithData:data
contentTypeHeader:contentType];
HTMLElement *div = [home firstNodeMatchingSelector:@".repository-meta-content"];
NSCharacterSet *whitespace = [NSCharacterSet whitespaceAndNewlineCharacterSet];
NSLog(@"%@", [div.textContent stringByTrimmingCharactersInSet:whitespace]);
// => A WHATWG-compliant HTML parser in Objective-C.
}] resume];InstallationYou have choices:
HTMLReader has no dependencies other than Foundation. Why HTMLReader?I needed to scrape HTML like a browser. I couldn't find a good choice for iOS. The Alternativeslibxml2 ships with iOS. It parses some variant of HTML 4 (?) and does not handle new/broken markup like a modern browser. Other Objective-C and Swift libraries I come across (e.g. Fuzi, hpple, Kanna, Ono) use libxml2 and inherit its shortcomings. SwiftSoup is a Swift port of Jsoup. It didn't exist when I made HTMLReader. (To be fair, publicly, neither did Swift.) There are C libraries such as Gumbo or Hubbub, but you need to shuffle data to and from Objective-C or Swift. (Also Gumbo wasn't publicly announced until after HTMLReader was far along.) WebKit ships with iOS, but its HTML parsing abilities are considered private API. I consider a round-trip through a web view inappropriate for parsing HTML. And I didn't make it very far into building my own copy of WebCore. Google Toolbox for Mac will escape and unescape strings for HTML (e.g. CFStringTransform does numeric entities via (the reversible) Does it work?HTMLReader continually runs html5lib's tokenization and tree construction tests, ignoring the tests for HTMLReader is continually built and tested on iOS versions 8.4, 9.3, 10.3, and 11.0; built and tested on macOS versions 10.9, 10.10, 10.11, 10.12, and 10.13; built and tested on tvOS versions 9.2, 10.2, and 11.0; and built on watchOS versions 2.2, 3.2, and 4.0. It should work on down to iOS 5, macOS 10.7, tvOS 9.0, and watchOS 2.0, but there is no automated testing there (it's ok to file an issue though!). Given all that: HTMLReader is used by at least one shipping app. How fast is it?I'm not sure. Included in the project is a utility called Benchmarker. It knows how to run three tests:
Changes to HTMLReader should not cause these benchmarks to run slower. Ideally changes make them run faster! Bugs and Feature RequestsBugs can be reported, and features can be requested, using the issue tracker. Or get in touch directly if you'd prefer. LicenseHTMLReader is in the public domain. AcknowledgementsHTMLReader is developed by Nolan Waite. Thanks to Chris Williams for contributing the implementation of CSS selectors. 
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2023-10-27
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