Change excludes from method to class attribute

Remove `getExcludes` and replace with a class attribute `ANCESTOR_EXCLUDES`.

4 files changed, 9 insertions, 14 deletions

diff --git a/docs/extensions/api.txt b/docs/extensions/api.txt
index 29bf83f..246bb27 100644
--- a/docs/extensions/api.txt
+++ b/docs/extensions/api.txt
@@ -53,7 +53,7 @@ A pseudo example:
 Inline Patterns {: #inlinepatterns }
 ------------------------------------
 
-Inline Patterns implement the inline HTML element syntax for Markdown such as
+Inline Patterns implement the inline HTML element syntax for Markdown such as 
 `*emphasis*` or `[links](http://example.com)`. Pattern objects should be 
 instances of classes that inherit from `markdown.inlinepatterns.Pattern` or 
 one of its children. Each pattern object uses a single regular expression and 
@@ -68,11 +68,9 @@ must have the following methods:
     Accepts a match object and returns an ElementTree element of a plain 
     Unicode string.
 
-* **`getExcludes()`**: 
-
-    Returns an array of tag names that are undesirable ancestors. The pattern 
-    should not match if it would cause the content to be a descendant of one 
-    of the tag names in the list.
+Also, Inline Patterns can define the property `ANCESTOR_EXCLUDES` with either 
+a list or tuple of undesirable ancestors. The pattern should not match if it 
+would cause the content to be a descendant of one of the defined tag names.
 
 Note that any regular expression returned by `getCompiledRegExp` must capture
 the whole block. Therefore, they should all start with `r'^(.*?)'` and end
diff --git a/markdown/inlinepatterns.py b/markdown/inlinepatterns.py
index f483f99..2f00b3d 100644
--- a/markdown/inlinepatterns.py
+++ b/markdown/inlinepatterns.py
@@ -189,6 +189,8 @@ The pattern classes
 class Pattern(object):
     """Base class that inline patterns subclass. """
 
+    ANCESTOR_EXCLUDES = tuple()
+
     def __init__(self, pattern, markdown_instance=None):
         """
         Create an instant of an inline pattern.
@@ -207,10 +209,6 @@ class Pattern(object):
         if markdown_instance:
             self.markdown = markdown_instance
 
-    def getExcludes(self):
-        """Get tag to exclude."""
-        return []
-
     def getCompiledRegExp(self):
         """ Return a compiled regular expression. """
         return self.compiled_re
diff --git a/markdown/treeprocessors.py b/markdown/treeprocessors.py
index ab31dd6..f159a8a 100644
--- a/markdown/treeprocessors.py
+++ b/markdown/treeprocessors.py
@@ -231,7 +231,8 @@ class InlineProcessor(Treeprocessor):
         Returns: String with placeholders instead of ElementTree elements.
 
         """
-        for exclude in pattern.getExcludes():
+
+        for exclude in pattern.ANCESTOR_EXCLUDES:
             if exclude.lower() in self.ancestors:
                 return data, False, 0
 
diff --git a/tests/test_apis.py b/tests/test_apis.py
index cbcb989..48e79e8 100644
--- a/tests/test_apis.py
+++ b/tests/test_apis.py
@@ -778,9 +778,7 @@ class TestAncestorExclusion(unittest.TestCase):
     class AncestorExample(markdown.inlinepatterns.SimpleTagPattern):
         """ Ancestor Test. """
 
-        def getExcludes(self):
-            """ Tags to exclude. """
-            return ['a']
+        ANCESTOR_EXCLUDES = ('a',)
 
         def handleMatch(self, m):
             """ Handle match. """