Ksoup is a lightweight Kotlin Multiplatform library for parsing HTML, extracting HTML tags, attributes, and text, and encoding and decoding HTML entities.
- Parse HTML from String
- Extract HTML tags, attributes, and text
- Encode and decode HTML entities
- Lightweight and does not depend on any other library
- Kotlin Multiplatform support
- Fast and efficient
- Unit tested
Add the dependency below to your module's build.gradle.kts or build.gradle file:
val version = "0.1.3"
// For parsing HTML
implementation("com.mohamedrejeb.ksoup:ksoup-html:$version")
// Only for encoding and decoding HTML entities
implementation("com.mohamedrejeb.ksoup:ksoup-entites:$version")To parse HTML from a String, use the KsoupHtmlParser class, and provide an implementation of the KsoupHtmlHandler interface, and a KsoupHtmlOptions object.
Both of them are optional, you can use the default ones if you want.
You can create a parser using the KsoupHtmlParser(), there are several methods that you can use, for example write to parse a String, and end to close the parser when you are done:
val ksoupHtmlParser = KsoupHtmlParser()
// String to parse
val html = "<h1>My Heading</h1>"
// Pass the HTML to the parser (It is going to parse the HTML and call the callbacks)
ksoupHtmlParser.write(html)
// Close the parser when you are done
ksoupHtmlParser.end()You can directly implement KsoupHtmlHandler interface or use KsoupHtmlHandler.Builder():
// Implement `KsoupHtmlHandler` interface
val firstHandler = object : KsoupHtmlHandler {
override fun onOpenTag(name: String, attributes: Map<String, String>, isImplied: Boolean) {
println("Open tag: $name")
}
}
// Use `KsoupHtmlHandler.Builder()`
val secondHandler = KsoupHtmlHandler
.Builder()
.onOpenTag { name, attributes, isImplied ->
println("Open tag: $name")
}
.build()There are several methods that you can override, for example is you want to just extract the text from the HTML, you can override the onText method:
// String to parse
val html = """
<html>
<head>
<title>My Title</title>
</head>
<body>
<h1>My Heading</h1>
<p>My paragraph.</p>
</body>
</html>
""".trimIndent()
// String to store the extracted text
var string = ""
// Create a handler
val handler = KsoupHtmlHandler
.Builder()
.onText { text ->
string += text
}
.build()
// Create a parser
val ksoupHtmlParser = KsoupHtmlParser(
handler = handler,
)
// Pass the HTML to the parser (It is going to parse the HTML and call the callbacks)
ksoupHtmlParser.write(html)
// Close the parser when you are done
ksoupHtmlParser.end()You can also use onOpenTag and onCloseTag to know when a tag is opened or closed, it can be used for scrapping data from a website or powering a rich text editor,
Also you can use onComment to know when a comment is found in the HTML and onAttribute to know when attributes are found in a tag.
You can also pass KsoupHtmlOptions to the parser to change the behavior of the parser, you can for example disable the decoding of HTML entities which is enabled by default:
val options = KsoupHtmlOption(
decodeEntities = false,
)You can use the KsoupEntities class to encode and decode HTML entities:
// Encode HTML entities
val encoded = KsoupEntities.encodeHtml("Hello & World") // return: Hello & World
// Decode HTML entities
val decoded = KsoupEntities.decodeHtml("Hello & World") // return: Hello & WorldKsoupEntities also provides methods to encode and decode only XML entities or HTML4.
The KsoupEntities class is available in the ksoup-entites module.
Both encodeHtml and decodeHtml methods support all HTML5 entities, XML entities, and HTML4 entities.
- Add clear documentation
- Add Markdown parser
If you've found an error in this sample, please file an issue.
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Copyright 2023 Mohamed Rejeb
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
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distributed under the License is distributed on an "AS IS" BASIS,
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