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known-failures.html
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known-failures.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<link rel="icon" href="assets/favicon.png" />
<title>Known failures ▲ Prism</title>
<link rel="stylesheet" href="assets/style.css" />
<link rel="stylesheet" href="themes/prism.css" data-noprefix />
<style>
#toc {
display: block;
position: static;
max-width: 900px;
font-size: 100%;
color: black;
}
#toc > ol {
columns: 4;
}
</style>
<script src="assets/vendor/prefixfree.min.js"></script>
<script>var _gaq = [['_setAccount', 'UA-33746269-1'], ['_trackPageview']];</script>
<script src="https://www.google-analytics.com/ga.js" async></script>
</head>
<body class="language-none">
<header>
<div class="intro" data-src="assets/templates/header-main.html" data-type="text/html"></div>
<h2>Known failures</h2>
<p>A list of rare edge cases where Prism highlights code incorrectly.</p>
</header>
<section>
<p>There are certain edge cases where Prism will fail. There are always such cases in every regex-based syntax highlighter. <br>
However, Prism dares to be open and honest about them. If a failure is listed here, it doesn’t mean it will never be fixed. This is more of a “known bugs” list, just with a certain type of bug.</p>
</section>
<section class="language-applescript">
<h3>Comments only support one level of nesting</h3>
<pre><code>(* Nested block
(* comments
(* on more than
2 levels *)
are *)
not supported *)</code></pre>
</section>
<section class="language-autoit">
<h3>Nested block comments</h3>
<pre><code>#cs
#cs
foo()
#ce
#ce</code></pre>
</section>
<section class="language-bison">
<h3>Two levels of nesting inside C section</h3>
<pre><code>{
if($1) {
if($2) {
}
}
} // <- Broken
%%
%%</code></pre>
</section>
<section class="language-d">
<h3>Comments only support one level of nesting</h3>
<pre><code>/+ /+ /+ this does not work +/ +/ +/</code></pre>
<h3>Token strings only support one level of nesting</h3>
<pre><code>q{ q{ q{ this does not work } } }</code></pre>
</section>
<section class="language-elixir">
<h3>String interpolation in single-quoted strings</h3>
<pre><code>'#{:atom} <- this should not be highligted'</code></pre>
</section>
<section class="language-groovy">
<h3>Two divisions on the same line</h3>
<pre><code>2 / 3 / 4</code></pre>
</section>
<section class="language-inform7">
<h3>Names starting with a number</h3>
<pre><code>The box 1A is a container</code></pre>
</section>
<section class="language-javascript">
<h3>String interpolation containing a closing brace</h3>
<pre><code>`${ /* } */ a + b }`
`${ '}' }`</code></pre>
<h3>String interpolation with deeply nested braces</h3>
<pre><code>`${foo({ a: { b: { c: true } } })}`</code></pre>
</section>
<section class="language-less">
<h3>At-rules looking like variables</h3>
<pre><code>@import "some file.less";</code></pre>
<h3>At-rules containing interpolation</h3>
<pre><code>@import "@{themes}/tidal-wave.less";</code></pre>
<h3>extend is not highlighted consistently</h3>
<pre><code>nav ul {
&:extend(.inline);
background: blue;
}
.a:extend(.b) {}</code></pre>
</section>
<section class="language-lua">
<h3>Functions with a single string parameter not using parentheses are not highlighted</h3>
<pre><code>foobar"param";</code></pre>
</section>
<section class="language-nasm">
<h3>Numbers with underscores</h3>
<pre><code>mov ax,1100_1000b
mov ax,1100_1000y
mov ax,0b1100_1000
mov ax,0y1100_1000
dd 1.222_222_222</code></pre>
</section>
<section class="language-parser">
<h3>Code block starting with a comment</h3>
<pre><code># Doesn't work
# Does work</code></pre>
<pre><code> # Does work when prefixed with a space</code></pre>
<h3>Comments inside expressions break literals and operators</h3>
<pre><code>^if(
$age>=4 # not too young
&& $age<=80 # and not too old
)</code></pre>
</section>
<section class="language-prolog">
<h3>Null-ary predicates are not highlighted</h3>
<pre><code>halt.
trace.
:- if(test1).
section_1.
:- elif(test2).
section_2.
:- elif(test3).
section_3.
:- else.
section_else.
:- endif.</code></pre>
</section>
<section class="language-puppet">
<h3>More than one level of nested braces inside interpolation</h3>
<pre><code>"Foobar ${foo({
bar => {baz => 42}
baz => 42
})} <- broken"</code></pre>
</section>
<section class="language-python">
<h3>Interpolation expressions containing strings with <code>{</code> or <code>}</code></h3>
<pre><code>f"{'}'}"</code></pre>
</section>
<section class="language-q">
<h3>The global context is highlighted as a verb</h3>
<pre><code>\d .</code></pre>
</section>
<section class="language-rest">
<h3>Nothing is highlighted inside table cells</h3>
<pre><code>+---------------+----------+
| column 1 | column 2 |
+--------------+-----------+
| **bold**? | *italic*? |
+--------------+-----------+</code></pre>
<h3>The inline markup recognition rules are not as strict as they are in the spec</h3>
<p>No inline markup should be highlighted in the following code.</p>
<pre><code>2 * x a ** b (* BOM32_* ` `` _ __ |
"*" '|' (*) [*] {*} <*> ‘*’ ‚*‘ ‘*‚ ’*’ ‚*’ “*” „*“ “*„ ”*” „*” »*« ›*‹ «*» »*» ›*›</code></pre>
</section>
<section class="language-rust">
<h3>Nested block comments</h3>
<pre><code>/* Nested block
/* comments
are */
not supported */</code></pre>
<h3>Delimiters of parameters for closures that don't use braces</h3>
<pre><code>|x| x + 1i;</code></pre>
</section>
<section class="language-sass">
<h3>Deprecated Sass syntax is not supported</h3>
<pre><code>.page
color = 5px + 9px
!width = 13px
.icon
width = !width</code></pre>
<h3>Selectors with pseudo classes are highlighted as property/value pairs</h3>
<pre><code>a:hover
text-decoration: underline</code></pre>
</section>
<section class="language-scala">
<h3>Nested block comments</h3>
<pre><code>/* Nested block
/* comments
are */
not supported */</code></pre>
</section>
<section class="language-scheme">
<h3>The first argument of <code>case-lambda</code> argument lists are highlighted as functions</h3>
<pre><code>(define plus
(case-lambda
(() 0)
((x) x)
((x y) (+ x y))
((x y z) (+ (+ x y) z))
(args (apply + args))))</code></pre>
</section>
<section class="language-swift">
<h3>Nested block comments</h3>
<pre><code>/* Nested block
/* comments
are */
not supported */</code></pre>
</section>
<section class="language-textile">
<h3>HTML inside Textile is not supported</h3>
<p>But Textile inside HTML should be just fine.</p>
<pre><code><strong>This _should_ work properly.</strong>
*But this is <em>definitely</em> broken.*</code></pre>
</section>
<section class="language-twig">
<h3>Tag containing Twig is not highlighted</h3>
<pre><code><div{% if foo %} class="bar"{% endif %}></div></code></pre>
</section>
<section class="language-wiki">
<h3>Nested magic words are not supported</h3>
<pre><code>{{#switch:{{PAGENAME}}
| L'Aquila = No translation
| L = Not OK
| L'Aquila = Entity escaping
| L'Aquila = Numeric char encoding
}}</code></pre>
<h3>Nesting of bold and italic is not supported</h3>
<pre><code>''Italic with '''bold''' inside''</code></pre>
</section>
<section>
<h1 id="themes">Themes</h1>
<p>Some of our themes are not compatible with certain layouts.</p>
<h2>Coy</h2>
<p>Coy's shadows and background might not wrap around the code correctly if combined with float of flexbox layouts.</p>
<img src="assets/img/failures/coy-overlap.png"/>
<h3>Workarounds</h3>
<p>There are 2 possible workarounds:</p>
<p>The first workaround is setting <code>display: flex-root;</code> for the <code>pre</code> element. This will fix the issue but <code>flex-root</code> has <a href="https://caniuse.com/#feat=flow-root">limited browser support</a>.</p>
<p>The second is adding <code>clear: both;</code> to the style of the <code>pre</code> element. This will fix the issue but it will change the way code blocks behave when overlapping with other elements.</p>
</section>
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