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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> <footer data-src="assets/templates/footer.html" data-type="text/html"></footer> <script src="assets/vendor/utopia.js"></script> <script src="prism.js"></script> <script src="plugins/autoloader/prism-autoloader.js" data-autoloader-path="components"></script> <script src="components.js"></script> <script> $$('section[class*=language-]').forEach(function (section) { var lang = /(?:^|\s)language-([\w-]+)(?:$|\s)/.exec(section.className)[1]; var title = components.languages[lang].title; $u.element.create('h1', { contents: title, id: lang, before: section.firstChild }); }); $$('section > h1').forEach(function (h1) { $u.element.create('p', { contents: { tag: 'a', properties: { href: '#toc' }, contents: '↑ Back to top' }, inside: h1.parentNode }); }); </script> <script src="assets/code.js"></script> </body> </html>