Eliminate unnecessary processing of language detection

Author: fujicoin

mnemonic/mnemonic.py

@@ -66,6 +66,7 @@ def b58encode(v: bytes) -> str:
 
 class Mnemonic(object):
     def __init__(self, language: str):
+        self.language = language
         self.radix = 2048
         with open(
             "%s/%s.txt" % (self._get_directory(), language), "r", encoding="utf-8"
@@ -81,14 +82,6 @@ def __init__(self, language: str):
     def _get_directory() -> str:
         return os.path.join(os.path.dirname(__file__), "wordlist")
 
-    @classmethod
-    def list_languages(cls) -> List[str]:
-        return [
-            f.split(".")[0]
-            for f in os.listdir(cls._get_directory())
-            if f.endswith(".txt")
-        ]
-
     @staticmethod
     def normalize_string(txt: AnyStr) -> str:
         if isinstance(txt, bytes):
@@ -100,19 +93,6 @@ def normalize_string(txt: AnyStr) -> str:
 
         return unicodedata.normalize("NFKD", utxt)
 
-    @classmethod
-    def detect_language(cls, code: str) -> str:
-        code = cls.normalize_string(code)
-        first = code.split(" ")[0]
-        languages = cls.list_languages()
-
-        for lang in languages:
-            mnemo = cls(lang)
-            if first in mnemo.wordlist:
-                return lang
-
-        raise ConfigurationError("Language not detected")
-
     def generate(self, strength: int = 128) -> str:
         if strength not in [128, 160, 192, 224, 256]:
             raise ValueError(
@@ -135,7 +115,7 @@ def to_entropy(self, words: Union[List[str], str]) -> bytearray:
         concatLenBits = len(words) * 11
         concatBits = [False] * concatLenBits
         wordindex = 0
-        if self.detect_language(" ".join(words)) == "english":
+        if self.language == "english":
             use_binary_search = True
         else:
             use_binary_search = False
@@ -189,7 +169,7 @@ def to_mnemonic(self, data: bytes) -> str:
             idx = int(b[i * 11 : (i + 1) * 11], 2)
             result.append(self.wordlist[idx])
         if (
-            self.detect_language(" ".join(result)) == "japanese"
+            self.language == "japanese"
         ):  # Japanese must be joined by ideographic space.
             result_phrase = u"\u3000".join(result)
         else: