English
Javascript code prettifier
Languages : CH
Javascript code prettifier
Setup
- Download a distribution
- Include the script and stylesheets in your document
(you will need to make sure the css and js file are on your server, and
adjust the paths in the script and link tag)
<link href="prettify.css" type="text/css" rel="stylesheet" />
<script type="text/javascript" src="prettify.js"></script>
- Add
onload="prettyPrint()" to your
document's body tag.
- Modify the stylesheet to get the coloring you prefer
Usage
Put code snippets in
<pre class="prettyprint">...</pre>
or <code class="prettyprint">...</code>
and it will automatically be pretty printed.
| The original | Prettier |
|---|---|
class Voila { public: // Voila static const string VOILA = "Voila"; // will not interfere with embedded tags. } | class Voila { public: // Voila static const string VOILA = "Voila"; // will not interfere with embedded tags. } |
FAQ
Which languages does it work for?
The comments in prettify.js are authoritative but the lexer should work on a number of languages including C and friends, Java, Python, Bash, SQL, HTML, XML, CSS, Javascript, and Makefiles. It works passably on Ruby, PHP, VB, and Awk and a decent subset of Perl and Ruby, but, because of commenting conventions, doesn't work on Smalltalk, or CAML-like languages.
LISPy languages are supported via an extension:
lang-lisp.js.
And similarly for
CSS,
Haskell,
Lua,
OCAML, SML, F#,
Visual Basic,
SQL,
Protocol Buffers, and
WikiText..
If you'd like to add an extension for your favorite language, please look at src/lang-lisp.js and file an issue including your language extension, and a testcase.
How do I specify which language my code is in?
You don't need to specify the language since prettyprint()
will guess. You can specify a language by specifying the language extension
along with the prettyprint class like so:
<pre class="prettyprint lang-html">
The lang-* class specifies the language file extensions.
File extensions supported by default include
"bsh", "c", "cc", "cpp", "cs", "csh", "cyc", "cv", "htm", "html",
"java", "js", "m", "mxml", "perl", "pl", "pm", "py", "rb", "sh",
"xhtml", "xml", "xsl".
</pre>
It doesn't work on <obfuscated code sample>?
Yes. Prettifying obfuscated code is like putting lipstick on a pig — i.e. outside the scope of this tool.
Which browsers does it work with?
It's been tested with IE 6, Firefox 1.5 & 2, and Safari 2.0.4. Look at the test page to see if it works in your browser.
What's changed?
See the change log
Why doesn't Prettyprinting of strings work on WordPress?
Apparently wordpress does "smart quoting" which changes close quotes. This causes end quotes to not match up with open quotes.
This breaks prettifying as well as copying and pasting of code samples. See WordPress's help center for info on how to stop smart quoting of code snippets.
How do I put line numbers in my code?
You can use the linenums class to turn on line
numbering. If your code doesn't start at line number 1, you can
add a colon and a line number to the end of that class as in
linenums:52.
For example
<pre class="prettyprint linenums:4" >// This is line 4. foo(); bar(); baz(); boo(); far(); faz(); <pre>produces
// This is line 4. foo(); bar(); baz(); boo(); far(); faz();
How do I prevent a portion of markup from being marked as code?
You can use the nocode class to identify a span of markup
that is not code.
<pre class=prettyprint> int x = foo(); /* This is a comment <span class="nocode">This is not code</span> Continuation of comment */ int y = bar(); </pre>produces
int x = foo(); /* This is a comment This is not code
Continuation of comment */
int y = bar();
For a more complete example see the issue22 testcase.
I get an error message "a is not a function" or "opt_whenDone is not a function"
If you are calling prettyPrint via an event handler, wrap it in a function.
Instead of doing
addEventListener('load', prettyPrint, false);
wrap it in a closure like
addEventListener('load', function (event) { prettyPrint() }, false);
so that the browser does not pass an event object to prettyPrint which
will confuse it.
