Kanna is a Swift library used for parsing HTML and XML. It provides a way to select and manipulate HTML or XML elements and supports both CSS selector queries and XPath queries.
To use XPath with Kanna, you need to parse the HTML or XML content first using Kanna's parsing functions. Once the content is parsed, you can use the xpath method to execute XPath queries on the document.
Here's an example of how to use Kanna with XPath queries in Swift:
import Kanna
let html = """
<html>
<head>
<title>Test Page</title>
</head>
<body>
<div id="content">
<p class="paragraph">First paragraph</p>
<p class="paragraph">Second paragraph</p>
</div>
</body>
</html>
"""
do {
// Parse the HTML
let doc = try HTML(html: html, encoding: .utf8)
// Use XPath to select elements
for p in doc.xpath("//div[@id='content']/p") {
// Do something with each paragraph element
print(p.text ?? "")
}
} catch {
print("Error parsing HTML: \(error)")
}
In this example, the xpath method is used to select all <p> elements within the <div> with the id of "content". The resulting nodes are iterated over, and their text content is printed.
Make sure you have Kanna installed in your Swift project to use it. You can add Kanna to your project using CocoaPods, Carthage, or Swift Package Manager.
Keep in mind that Kanna is specifically for Swift, and XPath support may vary depending on the library or language you are using. In other languages, you would use different libraries that support XPath. For example, in Python, you might use lxml or BeautifulSoup (with lxml as the parser), and in JavaScript (Node.js), you might use cheerio with xpath or jsdom. Each of these libraries has its own way of handling XPath queries.
