Refined handling of zero. Fixes #105, fixes #106.

tests/test_text_to_num_en.py

@@ -126,6 +126,7 @@ def test_alpha2digit_zero(self):
         self.assertEqual(alpha2digit(source, "en"), expected)
 
         self.assertEqual(alpha2digit("zero", "en"), "0")
+        self.assertEqual(alpha2digit("zero love", "en"), "0 love")
 
     def test_alpha2digit_ordinals(self):
         source = (

tests/test_text_to_num_fr.py

@@ -143,6 +143,8 @@ def test_alpha2digit_zero(self):
         # self.assertEqual(alpha2digit(source, "fr"), source)
 
         self.assertEqual(alpha2digit("zéro", "fr"), "0")
+        self.assertEqual(alpha2digit("a a un trois sept trois trois sept cinq quatre zéro c c", "fr"), "a a 1 3 7 3 3 7 5 4 0 c c")
+        self.assertEqual(alpha2digit("sept un zéro", "fr"), "7 1 0")
 
     def test_alpha2digit_ordinals(self):
         source = (

text_to_num/lang/base.py

@@ -70,7 +70,7 @@ def normalize(self, word: str) -> str:
         return NotImplemented
 
     def not_numeric_word(self, word: Optional[str]) -> bool:
-        return word is None or word != self.DECIMAL_SEP and word not in self.NUMBERS
+        return word is None or word != self.DECIMAL_SEP and word not in self.NUMBERS and word not in self.ZERO
 
     def split_number_word(self, word: str) -> str:  # maybe use: List[str]
         """In some languages numbers are written as one word, e.g. German

text_to_num/lang/english.py

@@ -117,7 +117,7 @@ class English(Language):
 
     AND_NUMS: Set[str] = set()
     AND = "and"
-    NEVER_IF_ALONE = {"one"}
+    NEVER_IF_ALONE = {"one", "o"}
 
     # Relaxed composed numbers (two-words only)
     # start => (next, target)

text_to_num/parsers.py

@@ -652,21 +652,21 @@ def push(self, word: str, look_ahead: Optional[str] = None) -> bool:
         elif (
             word in self.lang.ZERO
             and self.at_start_of_seq()
-            and (
-                look_ahead is None
-                or look_ahead in self.lang.NUMBERS
-                or look_ahead in self.lang.ZERO
-                or look_ahead in self.lang.DECIMAL_SEP
-            )
+            and look_ahead is not None
+            and look_ahead in self.lang.DECIMAL_SEP
         ):
-            self._value.append("0")
+            pass
         elif (
             word in self.lang.ZERO
             and self.at_start_of_seq()
-            and look_ahead is not None
-            and look_ahead in self.lang.DECIMAL_SEP
+            # and (
+            #     look_ahead is None
+            #     or look_ahead in self.lang.NUMBERS
+            #     or look_ahead in self.lang.ZERO
+            #     or look_ahead in self.lang.DECIMAL_SEP
+            # )
         ):
-            pass
+            self._value.append("0")
         elif self._push(self.lang.ord2card(word) or "", look_ahead):
             self._value.append(
                 self.lang.num_ord(