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Fenced Code Blocks
==================
Summary
-------
The Fenced Code Blocks extension adds a secondary way to define code blocks,
which overcomes a few limitations of the indented code blocks.
This extension is included in the standard Markdown library.
Syntax
------
Fenced Code Blocks are defined using the syntax established in
[PHP Markdown Extra][php].
[php]: http://www.michelf.com/projects/php-markdown/extra/#fenced-code-blocks
Thus, the following text (taken from the above referenced PHP documentation):
This is a paragraph introducing:
~~~~~~~~~~~~~~~~~~~~
a one-line code block
~~~~~~~~~~~~~~~~~~~~
Fenced code blocks can have a blank line as the first and/or last line of a
code block and they can also come immediately after a list item without becoming
part of the list.
!!! warning
Fenced Code Blocks are only supported at the document root level.
Therefore, they cannot be nested inside lists or blockquotes.
### Language ###
In addition to PHP Extra's syntax, you can define the language of the code
block for use by syntax highlighters etc. The language will be assigned as a
class attribute of the ``<code>`` element in the output. Therefore, you should
define the language as you would a CSS class - ``.language``. For consistency
with other markdown syntax, the language can *optionally* be wrapped in curly
brackets:
~~~~{.python}
# python code
~~~~
~~~~.html
<p>HTML Document</p>
~~~~
The above will output:
<pre><code class="python"># python code
</code></pre>
<pre><code class="html"><p>HTML Document</p>
</code></pre>
[GitHub][]'s backtick (`\``) syntax is also supported:
```python
# more python code
```
[GitHub]: http://github.github.com/github-flavored-markdown/
### Emphasized Lines ###
If you would like to have your fenced code blocks highlighted with the
[CodeHilite][] extension, simply enable that extension (remember that
[Pygments][] is its dependency) and the language of your fenced code blocks
will be passed in and highlighted appropriately.
Similar to the [colon][] syntax of the CodeHilite extension, fenced code blocks
can also have emphasized certain lines of code.
The lines can be specified with PHP Extra's syntax:
~~~~{.python hl_lines="1 3"}
# This line is emphasized
# This line isn't
# This line is emphasized
~~~~
... or with GitHub's:
```python hl_lines="1 3"
# This line is emphasized
# This line isn't
# This line is emphasized
```
[CodeHilite]: code_hilite.html
[Pygments]: http://pygments.org/
[colon]: code_hilite.html#colons
Usage
-----
See [Extensions](index.html) for general extension usage, specify `markdown.extensions.fenced_code`
as the name of the extension.
This extension does not accept any special configuration options.
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