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I'm a Swift newbie. I need for something like Python's BeautifulSoup in Swift iOS project. Precisely, I need to get all href of <a> that ends with ".txt". What are the steps that I should take?
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The best performers are Golang and C with very similar results. Python LIBXML2 performs fairly well. Ruby speed is similar to Python. Java parser tested is slower.
HTML is not a regular language and hence cannot be parsed by regular expressions. Regex queries are not equipped to break down HTML into its meaningful parts.
If you just want to parse HTML and your HTML is intended for the body of your document, you could do the following : (1) var div=document. createElement("DIV"); (2) div. innerHTML = markup; (3) result = div. childNodes; --- This gives you a collection of childnodes and should work not just in IE8 but even in IE6-7.
Which means that you can parse HTML documents after they have been modified by JavaScript. Both the JavaScript included in the page or a script you add yourself. The following example, from the documentation, shows a few features of AngleSharp.
There are several nice libraries of HTML Parsing using Swift and Objective-C like the followings:
Take a look in the following examples in the four libraries posted above, mainly parsed using XPath 2.0:
hpple:
let data = NSData(contentsOfFile: path) let doc = TFHpple(htmlData: data) if let elements = doc.searchWithXPathQuery("//a/@href[ends-with(.,'.txt')]") as? [TFHppleElement] { for element in elements { println(element.content) } } NDHpple:
let data = NSData(contentsOfFile: path)! let html = NSString(data: data, encoding: NSUTF8StringEncoding)! let doc = NDHpple(HTMLData: html) if let elements = doc.searchWithXPathQuery("//a/@href[ends-with(.,'.txt')]") { for element in elements { println(element.children?.first?.content) } } Kanna (Xpath and CSS Selectors):
let html = "<html><head></head><body><ul><li><input type='image' name='input1' value='string1value' class='abc' /></li><li><input type='image' name='input2' value='string2value' class='def' /></li></ul><span class='spantext'><b>Hello World 1</b></span><span class='spantext'><b>Hello World 2</b></span><a href='example.com'>example(English)</a><a href='example.co.jp'>example(JP)</a></body>" if let doc = Kanna.HTML(html: html, encoding: NSUTF8StringEncoding) { var bodyNode = doc.body if let inputNodes = bodyNode?.xpath("//a/@href[ends-with(.,'.txt')]") { for node in inputNodes { println(node.contents) } } } Fuzi (Xpath and CSS Selectors):
let html = "<html><head></head><body><ul><li><input type='image' name='input1' value='string1value' class='abc' /></li><li><input type='image' name='input2' value='string2value' class='def' /></li></ul><span class='spantext'><b>Hello World 1</b></span><span class='spantext'><b>Hello World 2</b></span><a href='example.com'>example(English)</a><a href='example.co.jp'>example(JP)</a></body>" do { // if encoding is omitted, it defaults to NSUTF8StringEncoding let doc = try HTMLDocument(string: html, encoding: NSUTF8StringEncoding) // XPath queries for anchor in doc.xpath("//a/@href[ends-with(.,'.txt')]") { print(anchor.stringValue) } } catch let error { print(error) } The ends-with function is part of Xpath 2.0.
SwiftSoup (CSS Selectors):
do{ let doc: Document = try SwiftSoup.parse("...") let links: Elements = try doc.select("a[href]") // a with href let pngs: Elements = try doc.select("img[src$=.png]") // img with src ending .png let masthead: Element? = try doc.select("div.masthead").first() // div with class=masthead let resultLinks: Elements? = try doc.select("h3.r > a") // direct a after h3 } catch Exception.Error(let type, let message){ print(message) } catch { print("error") } Ji (XPath):
let jiDoc = Ji(htmlURL: URL(string: "http://www.apple.com/support")!) let titleNode = jiDoc?.xPath("//head/title")?.first print("title: \(titleNode?.content)") // title: Optional("Official Apple Support") I hope this helps you.
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