[tn] english, fix crash on "" (#249)

* [tn] english, fix crash on ""

* [tn] english, fix crash on ""

Author: xingchensong

tn/english/normalizer.py

@@ -57,13 +57,21 @@ def build_tagger(self):
         punct = add_weight(Punctuation().tagger, 2.00)
         rang = add_weight(Range().tagger, 1.01)
         # TODO(xcsong): add roman
-        tagger = punct.star + \
-            (cardinal | ordinal | word
-             | date | decimal | fraction
-             | time | measure | money
+        tagger = \
+            (cardinal
+             | ordinal
+             | word
+             | date
+             | decimal
+             | fraction
+             | time
+             | measure
+             | money
              | telephone | electronic
              | whitelist
-             | rang).optimize() + (punct.plus | self.DELETE_SPACE)
+             | rang
+             | punct
+             ).optimize() + (punct.plus | self.DELETE_SPACE)
         # delete the last space
         self.tagger = tagger.star @ self.build_rule(delete(' '), r='[EOS]')
 
@@ -83,14 +91,20 @@ def build_verbalizer(self):
         punct = Punctuation().verbalizer
         rang = Range().verbalizer
         verbalizer = \
-            (cardinal | ordinal | word
-             | date | decimal
-             | fraction | time
-             | measure | money
+            (cardinal
+             | ordinal
+             | word
+             | date
+             | decimal
+             | fraction
+             | time
+             | measure
+             | money
              | telephone
              | electronic
              | whitelist
              | punct
-             | rang).optimize() + (punct.plus | self.INSERT_SPACE)
+             | rang
+             ).optimize() + (punct.plus | self.INSERT_SPACE)
         self.verbalizer = verbalizer.star @ self.build_rule(delete(' '),
                                                             r='[EOS]')

tn/english/test/data/normalizer.txt

@@ -3,3 +3,4 @@ The National Map, accessed April 1, 2011" Site Description of Koppers Co. From t
 .345" and ".456" "9.456" or 6.7890" => point three four five" and ".four hundred and fifty six" "nine point four five six" or six point seven eight nine oh"
 The museum is open Mon.-Sun. children of 3-4 years 123 The plan will help you lose 3-4 pounds the first week, and 1-2 pounds the weeks thereafter. => The museum is open Monday to Sunday children of three to four years one hundred and twenty three The plan will help you lose three to four pounds the first week, and one to two pounds the weeks thereafter.
 Try searching for 'Toyota' or 'Investment' => Try searching for 'Toyota' or 'Investment'
+"" => ""

tn/main.py

@@ -73,9 +73,8 @@ def main():
             full_to_half=str2bool(args.full_to_half),
             tag_oov=str2bool(args.tag_oov))
     elif args.language == "en":
-        normalizer = EnNormalizer(
-            cache_dir=args.cache_dir,
-            overwrite_cache=args.overwrite_cache)
+        normalizer = EnNormalizer(cache_dir=args.cache_dir,
+                                  overwrite_cache=args.overwrite_cache)
 
     if args.text:
         print(normalizer.tag(args.text))