Fix handling of begin/end inside inline math

Fixes #30.

Author: mitya57

mdx_math.py

@@ -129,7 +129,9 @@ def extendMarkdown(self, md):
             pattern._add_preview = add_preview
             pattern._content_type = content_type
             # we should have higher priority than 'escape' which has 180
-            md.inlinePatterns.register(pattern, 'math-%d' % i, 185)
+            # also begin/end pattern should have lower priority than all others
+            priority = 184 if i == 2 else 185
+            md.inlinePatterns.register(pattern, 'math-%d' % i, priority)
         for i, pattern in enumerate(inlinemathpatterns):
             pattern._add_preview = add_preview
             pattern._content_type = content_type

test.py

@@ -33,6 +33,8 @@ def r(mkd_name, html_name, **config):
     test_standalone_gitlab_nested = r('standalone_gitlab_nested', 'standalone_gitlab_nested', use_gitlab_delimiters=True)
     test_begin_end = r('beginend', 'beginend')
     test_begin_end_preview = r('beginend', 'beginend_preview', add_preview=True)
+    test_begin_end_inside_inline = r('beginend_inside_inline', 'beginend_inside_inline')
+    test_begin_end_inside_standalone = r('beginend_inside_standalone', 'beginend_inside_standalone')
     test_inline_asciimath = r('inline_asciimath', 'inline_asciimath', use_asciimath=True)
 
 

test_data/beginend_inside_inline.html

@@ -0,0 +1,3 @@
+<p>
+<script type="math/tex"> T(v) = \begin{bmatrix}\alpha & \beta \\ \gamma & \delta \end{bmatrix} </script>
+</p>

test_data/beginend_inside_inline.mkd

@@ -0,0 +1 @@
+\( T(v) = \begin{bmatrix}\alpha & \beta \\ \gamma & \delta \end{bmatrix} \)

test_data/beginend_inside_standalone.html

@@ -0,0 +1,9 @@
+<p>
+<script type="math/tex; mode=display">
+s(x) = \begin{cases}
+1 & \text{if } x > 0\\
+0 & \text{if } x = 0\\
+-1 & \text{if } x < 0
+\end{cases}
+</script>
+</p>

test_data/beginend_inside_standalone.mkd

@@ -0,0 +1,7 @@
+$$
+s(x) = \begin{cases}
+1 & \text{if } x > 0\\
+0 & \text{if } x = 0\\
+-1 & \text{if } x < 0
+\end{cases}
+$$