Introduce src dir.

[librarian.git] / src / librarian / embeds / mathml.py

diff --git a/src/librarian/embeds/mathml.py b/src/librarian/embeds/mathml.py
new file mode 100644 (file)
index 0000000..564a9f4
--- /dev/null
+++ b/src/librarian/embeds/mathml.py
@@ -0,0 +1,26 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from lxml import etree
+import six
+from librarian import get_resource
+from . import TreeEmbed, create_embed, downgrades_to
+
+
+class MathML(TreeEmbed):
+    @downgrades_to('application/x-latex')
+    def to_latex(self):
+        """
+        >>> print(MathML(etree.fromstring('<mat>a &lt; b</mat>')).to_latex().data.strip())
+        a < b
+
+        >>> print(MathML(etree.fromstring('<mat>&lt; &amp; &amp;lt; &#65;</mat>')).to_latex().data.strip())
+        < & &lt; A
+
+        """
+        xslt = etree.parse(get_resource('res/embeds/mathml/mathml2latex.xslt'))
+        output = self.tree.xslt(xslt)
+        text = six.text_type(output)
+        # Workaround for entities being preserved in output. But there should be a better way.
+        text = text.replace('&lt;', '<').replace('&amp;', '&')
+        return create_embed('application/x-latex', data=text)