From a8b7a4b71760932341b3a58542b5702495d65ba9 Mon Sep 17 00:00:00 2001
From: Phil Hughes <me@iamphill.com>
Date: Thu, 13 Apr 2017 13:02:17 +0100
Subject: Pulled in latest changes

---
 app/assets/javascripts/notebook/cells/markdown.vue | 73 +++++++++++++++++-----
 1 file changed, 59 insertions(+), 14 deletions(-)

(limited to 'app/assets')

diff --git a/app/assets/javascripts/notebook/cells/markdown.vue b/app/assets/javascripts/notebook/cells/markdown.vue
index 4e0e60284f1..3e8240d10ec 100644
--- a/app/assets/javascripts/notebook/cells/markdown.vue
+++ b/app/assets/javascripts/notebook/cells/markdown.vue
@@ -10,8 +10,61 @@
   import marked from 'marked';
   import Prompt from './prompt.vue';
 
+  const renderer = new marked.Renderer();
+
+  /*
+    Regex to match KaTex blocks.
+
+    Supports the following:
+
+    \begin{equation}<math>\end{equation}
+    $$<math>$$
+    inline $<math>$
+
+    The matched text then goes through the KaTex renderer & then outputs the HTML
+  */
+  const katexRegexString = `(
+    ^\\\\begin{[a-zA-Z]+}\\s
+    |
+    ^\\$\\$
+    |
+    \\s\\$(?!\\$)
+  )
+    (.+?)
+  (
+    \\s\\\\end{[a-zA-Z]+}$
+    |
+    \\$\\$$
+    |
+    \\$
+  )
+  `.replace(/\s/g, '').trim();
+
+  renderer.paragraph = (t) => {
+    let text = t;
+    let inline = false;
+
+    if (typeof katex !== 'undefined') {
+      const katexString = text.replace(/\\/g, '\\');
+      const matches = new RegExp(katexRegexString, 'gi').exec(katexString);
+
+      if (matches && matches.length > 0) {
+        if (matches[1].trim() === '$' && matches[3].trim() === '$') {
+          inline = true;
+
+          text = `${katexString.replace(matches[0], '')} ${katex.renderToString(matches[2])}`;
+        } else {
+          text = katex.renderToString(matches[2]);
+        }
+      }
+    }
+
+    return `<p class="${inline ? 'inline-katex' : ''}">${text}</p>`;
+  };
+
   marked.setOptions({
     sanitize: true,
+    renderer,
   });
 
   export default {
@@ -26,20 +79,7 @@
     },
     computed: {
       markdown() {
-        const regex = new RegExp('^\\$\\$(.*)\\$\\$$', 'g');
-
-        const source = this.cell.source.map((line) => {
-          const matches = regex.exec(line.trim());
-
-          // Only render use the Katex library if it is actually loaded
-          if (matches && matches.length > 0 && typeof katex !== 'undefined') {
-            return katex.renderToString(matches[1]);
-          }
-
-          return line;
-        });
-
-        return marked(source.join(''));
+        return marked(this.cell.source.join(''));
       },
     },
   };
@@ -50,4 +90,9 @@
   display: block;
   text-align: center;
 }
+
+.markdown .inline-katex .katex {
+  display: inline;
+  text-align: initial;
+}
 </style>
-- 
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