Added fallback to vowel sound detection when no entry exists in CMUDICT

1 files changed, 11 insertions, 3 deletions

@@ -32,9 +32,17 @@ namespace verbly {
   
   bool word::starts_with_vowel_sound() const
   {
-    return std::any_of(std::begin(pronunciations), std::end(pronunciations), [] (std::list<std::string> phonemes) {
-      return (phonemes.front().find_first_of("012") != std::string::npos);
-    });
+    if (pronunciations.size() > 0)
+    {
+      return std::any_of(std::begin(pronunciations), std::end(pronunciations), [] (std::list<std::string> phonemes) {
+        return (phonemes.front().find_first_of("012") != std::string::npos);
+      });
+    } else {
+      // If the word is not in CMUDICT, fall back to checking whether the first letter is a vowel
+      // Not perfect but will work in most cases
+      char ch = tolower(base_form().front());
+      return (ch == 'a') || (ch == 'e') || (ch == 'i') || (ch == 'o') || (ch == 'u');
+    }
   }
   
 };