From 672c32dc15d420fa4c64df2c04d64d35efbf37d7 Mon Sep 17 00:00:00 2001
From: John MacFarlane <jgm@berkeley.edu>
Date: Thu, 3 Dec 2015 23:49:05 -0800
Subject: Added why-cmark-and-not-x page.

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 why-cmark-and-not-x.md | 86 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 86 insertions(+)
 create mode 100644 why-cmark-and-not-x.md

(limited to 'why-cmark-and-not-x.md')

diff --git a/why-cmark-and-not-x.md b/why-cmark-and-not-x.md
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+Why use `cmark` and not X?
+==========================
+
+`hoedown`
+---------
+
+`hoedown` (which derives from `sundown`) is slightly faster
+than `cmark` in our benchmarks (0.21s vs. 0.29s).  But both
+are much faster than any other available implementations.
+
+`hoedown` boasts of including "protection against all possible
+DOS attacks," but there are some chinks in the armor:
+
+    % time python -c 'print(("[" * 50000) + "a" + ("]" * 50000))' | cmark
+    ...
+    user 0m0.073s
+    % time python -c 'print(("[" * 50000) + "a" + ("]" * 50000))' | hoedown
+    ...
+    0m17.84s
+
+`hoedown` has many parsing bugs.  Here is a selection:
+
+    % hoedown
+    - one
+      - two
+        1. three
+    ^D
+    <ul>
+    <li>one
+
+    <ul>
+    <li>two</li>
+    <li>three</li>
+    </ul></li>
+    </ul>
+
+
+    % hoedown
+    ## hi\###
+    ^D
+    <h2>hi\</h2>
+
+
+    % hoedown
+    [ΑΓΩ]: /φου
+
+    [αγω]
+    ^D
+    <p>[αγω]</p>
+
+
+    % hoedown
+    ```
+    [foo]: /url
+    ```
+
+    [foo]
+    ^D
+    <p>```</p>
+
+    <p>```</p>
+
+    <p><a href="/url">foo</a></p>
+
+
+    % hoedown
+    [foo](url "ti\*tle")
+    ^D
+    <p><a href="url" title="ti\*tle">foo</a></p>
+
+
+`discount`
+----------
+
+`cmark` is about six times faster.
+
+`kramdown`
+----------
+
+`cmark` is about a hundred times faster.
+
+`kramdown` also gets tied in knots by pathological input like
+
+    python -c 'print(("[" * 50000) + "a" + ("]" * 50000))'
+
+
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