Basic ignore empty OpenGraph props

Author: Cristi Constantin

extruct/_extruct.py

@@ -54,6 +54,7 @@ def extract(htmlstring,
     if errors not in ['log', 'ignore', 'strict']:
         raise ValueError('Invalid error command, valid values are either "log"'
                          ', "ignore" or "strict"')
+
     try:
         tree = parse_xmldom_html(htmlstring, encoding=encoding)
     except Exception as e:
@@ -65,6 +66,7 @@ def extract(htmlstring,
             return {}
         if errors == 'strict':
             raise
+
     processors = []
     if 'microdata' in syntaxes:
         processors.append(
@@ -95,6 +97,7 @@ def extract(htmlstring,
             ('rdfa', RDFaExtractor().extract_items,
              tree,
              ))
+
     output = {}
     for syntax, extract, document in processors:
         try:
@@ -108,6 +111,7 @@ def extract(htmlstring,
                 pass
             if errors == 'strict':
                 raise
+
     if uniform:
         uniform_processors = []
         if 'microdata' in syntaxes:
@@ -131,6 +135,7 @@ def extract(htmlstring,
                  output['opengraph'],
                  None,
                  ))
+
         for syntax, uniform, raw, schema_context in uniform_processors:
             try:
                 if syntax == 'opengraph':

extruct/opengraph.py

@@ -32,6 +32,8 @@ def extract_items(self, document, base_url=None):
             for el in head.xpath('meta[@property and @content]'):
                 prop = el.attrib['property']
                 val = el.attrib['content']
+                if prop == '' or val == '':
+                    continue
                 ns = prop.partition(':')[0]
                 if ns in _OG_NAMESPACES:
                     namespaces[ns] = _OG_NAMESPACES[ns]

tests/samples/songkick/elysianfields.html

@@ -28,6 +28,7 @@
     <meta property="og:type" content="songkick-concerts:artist">
     <meta property="og:title" content="Elysian Fields">
     <meta property="og:description" content="Buy tickets for an upcoming Elysian Fields concert near you. List of all Elysian Fields tickets and tour dates for 2017.">
+    <meta property="og:description" content="" />
     <meta property="og:url" content="http://www.songkick.com/artists/236156-elysian-fields">
     <meta property="og:image" content="http://images.sk-static.com/images/media/img/col4/20100330-103600-169450.jpg">
     <meta property="og:image" content="http://images.sk-static.com/SECONDARY_IMAGE.jpg">

tests/samples/songkick/elysianfields.json

@@ -232,6 +232,9 @@
             "http://ogp.me/ns#description": [
                 {
                     "@value": "Buy tickets for an upcoming Elysian Fields concert near you. List of all Elysian Fields tickets and tour dates for 2017."
+                },
+                {
+                    "@value": ""
                 }
             ],
             "http://ogp.me/ns#image": [

tests/test_extruct.py

@@ -5,7 +5,6 @@
 import pytest
 
 import extruct
-from extruct import SYNTAXES
 from tests import get_testdata, jsonize_dict, replace_node_ref_with_node_id