Continue with warning style mapping cannot be parsed

1 files changed, 9 insertions, 2 deletions

diff --git a/mammoth/style_reader/__init__.py b/mammoth/style_reader/__init__.py
index 28281a8..aca07df 100644
--- a/mammoth/style_reader/__init__.py
+++ b/mammoth/style_reader/__init__.py
@@ -1,16 +1,23 @@
 from parsimonious.grammar import Grammar
+from parsimonious.exceptions import ParseError
 
 from .html_path_reader import read_html_path, grammar_text as html_path_grammar, read_html_path_node
 from .document_matcher_reader import read_document_matcher, grammar_text as document_matcher_grammar, read_document_matcher_node
 from ..styles import Style
+from .. import results
 
 
 __all__ = ["read_style", "read_html_path", "read_document_matcher"]
 
 
 def read_style(string):
-    style_node = _grammar.parse(string)
-    return _read_style_node(style_node)
+    try:
+        style_node = _grammar.parse(string)
+    except ParseError:
+        warning = "Did not understand this style mapping, so ignored it: " + string
+        return results.Result(None, [results.warning(warning)])
+    
+    return results.success(_read_style_node(style_node))
 
 
 def _read_style_node(style_node):