Add HTML path for ignoring elements

3 files changed, 20 insertions, 3 deletions

diff --git a/mammoth/html_paths.py b/mammoth/html_paths.py
index 487f278..53580ed 100644
--- a/mammoth/html_paths.py
+++ b/mammoth/html_paths.py
@@ -49,3 +49,8 @@ class HtmlPathElement(object):
         return [element]
 
 empty = path([])
+
+
+class ignore(object):
+    def wrap(self, generate_nodes):
+        return []
diff --git a/mammoth/style_reader/html_path_reader.py b/mammoth/style_reader/html_path_reader.py
index 20666d4..f70c8e3 100644
--- a/mammoth/style_reader/html_path_reader.py
+++ b/mammoth/style_reader/html_path_reader.py
@@ -9,8 +9,10 @@ def read_html_path(string):
 
 
 def read_html_path_node(path_node):
-    if path_node.children:
-        return _read_html_path_elements_node(path_node.children[0])
+    if path_node.children[0].expr_name == "ignore":
+        return html_paths.ignore
+    elif path_node.children[0].children:
+        return _read_html_path_elements_node(path_node.children[0].children[0])
     else:
         return html_paths.empty
 
@@ -67,7 +69,9 @@ def _repeated_children_with_separator(node, has_whitespace):
 
 grammar_text = r"""
 
-html_path = html_path_elements?
+html_path = ignore / html_path_elements?
+
+ignore = "!"
 
 html_path_elements = element (whitespace* ">" whitespace* element)*
 
diff --git a/tests/style_reader_tests.py b/tests/style_reader_tests.py
index fddc75b..61bc911 100644
--- a/tests/style_reader_tests.py
+++ b/tests/style_reader_tests.py
@@ -68,6 +68,14 @@ class ReadHtmlPathTests(object):
             read_html_path("p:fresh")
         )
 
+    
+    @istest
+    def can_read_ignore_element(self):
+        assert_equal(
+            html_paths.ignore,
+            read_html_path("!")
+        )
+
 
 @istest
 class ReadDocumentMatcherTests(object):