[−][src]Crate html_minifier
HTML Minifier
This library can help you generate and minify your HTML code at the same time. It also supports to minify JS and CSS in <style>
, <script>
elements, and ignores the minification of <pre>
, <code>
and <textarea>
elements.
HTML is minified by the following rules:
- ASCII control characters (0x00-0x08, 0x11-0x1F, 0x7F) are always removed.
- Comments can be optionally removed. (removed by default)
- Useless whitespaces (spaces, tabs and newlines) are removed.
- Whitespaces (spaces, tabs and newlines) are converted to a single
'\x20'
or a single '\n', if possible. - Empty attribute values are collapsed. (e.g
<input readonly="">
=><input readonly>
) - The inner HTML of all elements is minified except for the following elements:
<pre>
<textarea>
<code>
(optionally, minified by default)<style>
(if thetype
attribute is unsupported)<script>
(if thetype
attribute is unsupported)
- JS code and CSS code in
<script>
and<style>
elements are minified by minifier.
The original (non-minified) HTML doesn't need to be completely generated before using this library because this library doesn't do any deserialization to create DOMs.
In earier versions, this libaray tried to make HTML inline (e.g. <a>1</a>\n /\n <a>2</a>
=> <a>1</a> / <a>2</a>
). With this feature, CJ characters need to be checked, otherwise 中\n文
will be minified to 中 文
, which is incorrect.
After version 3.0.0
, this libaray doesn't try to make HTML inline anymore in favor of better performance by removing UTF-8 calculation. Moreover, with this change, it allows the input texts to be encoded not only in ASCII or UTF-8 but also in any other self-synchronizing encoding.
Examples
extern crate html_minifier; use html_minifier::HTMLMinifier; let mut html_minifier = HTMLMinifier::new(); html_minifier.digest("<!DOCTYPE html> <html ").unwrap(); html_minifier.digest("lang= en >").unwrap(); html_minifier.digest(" <head> <meta name=viewport> </head> ").unwrap(); html_minifier.digest(" <body class=' container bg-light '> <input type='text' value='123 456' readonly='' /> 123456 <b>big</b> 789 ab c 中文 字 </body> ").unwrap(); html_minifier.digest("</html >").unwrap(); assert_eq!("<!DOCTYPE html> <html lang=en> <head> <meta name=viewport> </head> <body class='container bg-light'> <input type='text' value='123 456' readonly/> 123456 <b>big</b> 789 ab c 中文 字 </body> </html>".as_bytes(), html_minifier.get_html());
extern crate html_minifier; use html_minifier::HTMLMinifier; let mut html_minifier = HTMLMinifier::new(); html_minifier.digest("<pre > Hello world! </pre >").unwrap(); assert_eq!(b"<pre> Hello world! </pre>", html_minifier.get_html());
extern crate html_minifier; use html_minifier::HTMLMinifier; let mut html_minifier = HTMLMinifier::new(); html_minifier.digest("<script type=' application/javascript '> alert('Hello!') ; </script>").unwrap(); assert_eq!("<script type='application/javascript'>alert('Hello!')</script>".as_bytes(), html_minifier.get_html());
Write HTML to a Writer
If you don't want to store your HTML in memory (e.g. writing to a file instead), you can use the HTMLMinifierHelper
struct which provides a low-level API that allows you to pass your output instance when invoking the digest
method.
extern crate html_minifier; use html_minifier::HTMLMinifierHelper; use std::fs::File; use std::io::Read; let mut input_file = File::open("tests/data/w3schools.com_tryhow_css_example_website.htm").unwrap(); let mut output_file = File::create("tests/data/index.min.html").unwrap(); let mut buffer = [0u8; 256]; let mut html_minifier_helper = HTMLMinifierHelper::new(); loop { let c = input_file.read(&mut buffer).unwrap(); if c == 0 { break; } html_minifier_helper.digest(&buffer[..c], &mut output_file).unwrap(); }
No Std
Disable the default features to compile this crate without std.
[dependencies.html-minifier]
version = "*"
default-features = false
Modules
css | |
js |
Structs
HTMLMinifier | This struct helps you generate and minify your HTML code in the same time. The output destination is inside this struct. |
HTMLMinifierHelper | This struct helps you generate and minify your HTML code in the same time. The output destination is outside this struct. |
Enums
HTMLMinifierError | Errors for |
Traits
HTMLWriter | Implement this trait to build a HTML writer. |
Functions
minify | Minify HTML. |