offline processing example replace tabs

fiftyone_devicedetection_examples/src/fiftyone_devicedetection_examples/onpremise/offlineprocessing.py

@@ -101,7 +101,10 @@ def run(self, data_file, evidence_yaml, logger, output):
 
         records = 0
         yaml = YAML()
-        yaml_data = yaml.load_all(evidence_yaml)
+        # Replace tab characters as they are not valid in unquoted YAML values
+        # and some evidence files contain them in user-agent strings.
+        content = evidence_yaml.read().replace('\t', ' ')
+        yaml_data = yaml.load_all(content)
 
         try:
             # Keep going as long as we have more document records.

fiftyone_devicedetection_examples/tests/test_onpremiseexamples.py

@@ -71,6 +71,21 @@ def test_onpremise_offline_processing(self):
                     example.run(self.data_file, input, self.logger, output)
             os.remove("./offlineprocessing-output.yml")
 
+    def test_onpremise_offline_processing_with_tabs(self):
+        """Test that offline processing handles tab characters in evidence YAML."""
+        from io import StringIO
+        evidence_with_tabs = (
+            "---\n"
+            "header.user-agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36\tChrome 98.0\n"
+            "---\n"
+            "header.user-agent: Mozilla/5.0 (Linux; Android 11; SM-G991B)\t\tChrome/91.0.4472.120\n"
+        )
+        example = OfflineProcessing()
+        output = StringIO()
+        example.run(self.data_file, StringIO(evidence_with_tabs), self.logger, output)
+        result = output.getvalue()
+        self.assertIn("device.ismobile", result)
+
     def test_onpremise_performance(self):
         # Only run if environment variable set
         if "run_performance_tests" in os.environ: