BracketPipe is a .NET library for building parsing and processing piplines for web languages like HTML, CSS, Javscript, SVG, and MathML. The parser is built upon the official W3C specification. It differentiates itself from other libraries such as AngleSharp (which it is based on) and HTML Agility Pack in that it does not build an in-memory representation of the DOM. Rather, it focuses on providing a convenient streaming interface for fast processing of HTML documents. This makes the library ideal for
- minifying HTML
- sanitizing HTML to prevent XSS attacks
- converting HTML to text
- crawling hyperlinks from HTML documents
- cleaning up MS Word HTML
- ... and any other task that only requires a single traversal of the HTML document
It can also be viewed as a modern update to previous projects such as the SgmlReader and Majestic-12 HTML Parser
Use a pipeline to parse, minify, and sanitize HTML;
var html = @"<div> <script>alert('xss');</script>
<a href=""http://www.google.com/"">Google</a>
<a href=""http://www.yahoo.com/"">Yahoo</a> </div>";
using (var reader = new HtmlReader(html))
{
var result = (string)reader.Sanitize().Minify().ToHtml();
Assert.AreEqual(@"<div><a href=""http://www.google.com/"">Google</a> <a href=""http://www.yahoo.com/"">Yahoo</a></div>"
, result);
}Parse the links from an HTML string
var html = @"<html> <body> <script>alert('xss');</script>
<a href=""http://www.google.com/"">Google</a>
<a href=""http://www.yahoo.com/"">Yahoo</a> </body> </html>";
using (var reader = new HtmlReader(html))
{
var urls = reader
.OfType<HtmlStartTag>()
.Where(t => t.Value == "a")
.Select(t => t["href"])
.ToArray();
CollectionAssert.AreEqual(new string[]
{
"http://www.google.com/",
"http://www.yahoo.com/"
}
, urls);
}Sanitize, minify, or convert HTML
var html = "Something to <strong>convert</strong>";
var str = Html.Sanitize(html);
str = Html.Minify(html);
str = Html.ToMarkdown(html)Write HTML
using (var s = new StringWriter())
using (var w = new HtmlTextWriter(s))
{
w["html"]
["body"]
["div", "style", "color:red", "id", "1234"]
.Text("A > value")
["/div"]
["input", "type", "text", "value", "start"]
["p"].Text("para & more")["/p"]
["/body"]
["/html"].Flush();
var str = s.ToString();
}XML to HTML
using (var s = new StringWriter())
using (var w = new HtmlTextWriter(s))
{
var xml = new XElement("body",
new XElement("div", new XAttribute("style", "color:red"), "A > value"),
new XElement("input", new XAttribute("type", "text"), new XAttribute("value", "start")),
new XElement("p", "para & more"));
xml.WriteTo(w);
w.Flush();
var str = s.ToString();
}
Install-Package BracketPipe
Using only the stripped down core of AngleSharp, BracketPipe achives incredibly fast performance. Comparison charts each showing the average time over thousands of operations:
Conversion to Markdown
Comparison to ReverseMarkdown and HTML2Markdown;
Minifying HTML
Comparison to WebMarkupMin;
Sanitizing HTML
Comparison to HtmlSanitizer
The parser uses the HTML 5.1 specification, which defines error handling and element correction. As a result, it works the same as all modern browsers.
It is designed as a .Net Standard library targeting .Net Standard 1.0.
That means it supports the following platforms:
- .NET Core 1.0+
- .NET Framework 4.5+
- Xamarin vNext+
- Universal Windows Platform 10.0+
- Windows 8.0+
- Windows Phone 8.1+
- Windows Phone Silverlight 8.0+
The NuGet package build also supports .Net 3.5 and .Net 4.0.
The MIT License (MIT)
Copyright (c) 2013 - 2016 BracketPipe
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.