From 1b01a8f62ccc476d8058f396dc69dafe1408d162 Mon Sep 17 00:00:00 2001
From: Adam Hovorka <adamhovorka@gmail.com>
Date: Thu, 23 Apr 2020 11:05:39 -0600
Subject: Initial commit

---
 markup.js | 115 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 115 insertions(+)
 create mode 100644 markup.js

(limited to 'markup.js')

diff --git a/markup.js b/markup.js
new file mode 100644
index 0000000..b39e0be
--- /dev/null
+++ b/markup.js
@@ -0,0 +1,115 @@
+// Tweaked from https://github.com/developit/snarkdown
+
+const markup = (() => {
+
+const TAGS = {
+  '' : ['<em>','</em>'],
+  _ : ['<strong>','</strong>'],
+  '~' : ['<s>','</s>'],
+  '\n' : ['</p><p>'],
+  ' ' : ['</p><p>'],
+  '-': ['<hr>']
+};
+
+const outdent = str =>
+  str.replace(RegExp('^'+(str.match(/^(\t| )+/) || '')[0], 'gm'), '');
+
+const encodeAttr = str =>
+  (str+'').replace(/"/g, '&quot;').replace(/</g, '&lt;').replace(/>/g, '&gt;');
+
+return (md, prevLinks) => {
+  let tokenizer = new RegExp(
+      "((?:^|\\n+)(?:\\n---+|\\* \\*(?: \\*)+)\\n)|" +
+      "(?:^``` *(\\w*)\\n([\\s\\S]*?)\\n```$)|" +
+      "((?:(?:^|\\n+)(?:\\t|  {2,}).+)+\\n*)|" +
+      "((?:(?:^|\\n)([>*+-]|\\d+\\.)\\s+.*)+)|" +
+      "(?:\\!\\[([^\\]]*?)\\]\\(([^\\)]+?)\\))|" +
+      "(\\[)|" + "(\\](?:\\(([^\\)]+?)\\))?)|" +
+      "(?:(?:^|\\n+)([^\\s].*)\\n(\\-{3,}|={3,})(?:\\n+|$))|" +
+      "(?:(?:^|\\n+)(#{1,6})\\s*(.+)(?:\\n+|$))|" +
+      "(?:`([^`].*?)`)|(  \\n\\n*|\\n{2,}|__|\\*\\*|[_*]|~~)", "gm"),
+    context = [],
+    out = '',
+    links = prevLinks || {},
+    last = 0,
+    chunk, prev, token, inner, t;
+
+  function tag(token) {
+    const desc = TAGS[token.replace(/\*/g,'_')[1] || ''],
+      end = context[context.length-1]==token;
+    if (!desc) return token;
+    if (!desc[1]) return desc[0];
+    context[end?'pop':'push'](token);
+    return desc[end|0];
+  }
+
+  function flush() {
+    let str = '';
+    while (context.length) str += tag(context[context.length-1]);
+    return str;
+  }
+
+  md = md.replace(/^\[(.+?)\]:\s*(.+)$/gm, (s, name, url) => {
+    links[name.toLowerCase()] = url;
+    return '';
+  }).replace(/^\n+|\n+$/g, '');
+
+  while ((token = tokenizer.exec(md))) {
+    prev = md.substring(last, token.index);
+    last = tokenizer.lastIndex;
+    chunk = token[0];
+    if (prev.match(/[^\\](\\\\)*\\$/)) {
+      // escaped
+    }
+    // Code/Indent blocks:
+    else if (token[3] || token[4]) {
+      chunk = '<pre class="code '+(token[4]?'poetry':token[2].toLowerCase())+'">'+
+        outdent(encodeAttr(token[3] || token[4]).replace(/^\n+|\n+$/g, ''))+'</pre>';
+    }
+    // > Quotes, -* lists:
+    else if (token[6]) {
+      t = token[6];
+      if (t.match(/\./)) {
+        token[5] = token[5].replace(/^\d+/gm, '');
+      }
+      inner = parse(outdent(token[5].replace(/^\s*[>*+.-]/gm, '')));
+      if (t==='>') t = 'blockquote';
+      else {
+        t = t.match(/\./) ? 'ol' : 'ul';
+        inner = inner.replace(/^(.*)(\n|$)/gm, '<li>$1</li>');
+      }
+      chunk = '<'+t+'>' + inner + '</'+t+'>';
+    }
+    // Images:
+    else if (token[8]) {
+      chunk = `<img src="${encodeAttr(token[8])}" alt="${encodeAttr(token[7])}">`;
+    }
+    // Links:
+    else if (token[10]) {
+      out = out.replace('<a>', `<a href="${encodeAttr(token[11] || links[prev.toLowerCase()])}">`);
+      chunk = flush() + '</a>';
+    }
+    else if (token[9]) {
+      chunk = '<a>';
+    }
+    // Headings:
+    else if (token[12] || token[14]) {
+      t = 'h' + (token[14] ? token[14].length : (token[13][0]==='='?1:2));
+      chunk = '<'+t+'>' + parse(token[12] || token[15], links) + '</'+t+'>';
+    }
+    // `code`:
+    else if (token[16]) {
+      chunk = '<code>'+encodeAttr(token[16])+'</code>';
+    }
+    // Inline formatting: *em*, **strong** & friends
+    else if (token[17] || token[1]) {
+      chunk = tag(token[17] || '--');
+    }
+    out += prev;
+    out += chunk;
+  }
+
+  return "<p>" + (out + md.substring(last) + flush()).trim() + "</p>";
+};
+
+})();
-- 
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