Add Laotian locale (#1105)

Co-authored-by: Jad Chaar <jadchaar@users.noreply.github.com>

arrow/constants.py

@@ -166,6 +166,8 @@
     "ka-ge",
     "kk",
     "kk-kz",
+    # "lo",
+    # "lo-la",
     "am",
     "am-et",
 }

arrow/locales.py

@@ -3971,6 +3971,114 @@ def _format_relative(
         return relative_string
 
 
+class LaotianLocale(Locale):
+
+    names = ["lo", "lo-la"]
+
+    past = "{0} ກ່ອນຫນ້ານີ້"
+    future = "ໃນ {0}"
+
+    timeframes = {
+        "now": "ດຽວນີ້",
+        "second": "ວິນາທີ",
+        "seconds": "{0} ວິນາທີ",
+        "minute": "ນາທີ",
+        "minutes": "{0} ນາທີ",
+        "hour": "ຊົ່ວໂມງ",
+        "hours": "{0} ຊົ່ວໂມງ",
+        "day": "ມື້",
+        "days": "{0} ມື້",
+        "week": "ອາທິດ",
+        "weeks": "{0} ອາທິດ",
+        "month": "ເດືອນ",
+        "months": "{0} ເດືອນ",
+        "year": "ປີ",
+        "years": "{0} ປີ",
+    }
+
+    month_names = [
+        "",
+        "ມັງກອນ",  # mangkon
+        "ກຸມພາ",  # kumpha
+        "ມີນາ",  # mina
+        "ເມສາ",  # mesa
+        "ພຶດສະພາ",  # phudsapha
+        "ມິຖຸນາ",  # mithuna
+        "ກໍລະກົດ",  # kolakod
+        "ສິງຫາ",  # singha
+        "ກັນຍາ",  # knaia
+        "ຕຸລາ",  # tula
+        "ພະຈິກ",  # phachik
+        "ທັນວາ",  # thanuaa
+    ]
+    month_abbreviations = [
+        "",
+        "ມັງກອນ",
+        "ກຸມພາ",
+        "ມີນາ",
+        "ເມສາ",
+        "ພຶດສະພາ",
+        "ມິຖຸນາ",
+        "ກໍລະກົດ",
+        "ສິງຫາ",
+        "ກັນຍາ",
+        "ຕຸລາ",
+        "ພະຈິກ",
+        "ທັນວາ",
+    ]
+
+    day_names = [
+        "",
+        "ວັນຈັນ",  # vanchan
+        "ວັນອັງຄານ",  # vnoangkhan
+        "ວັນພຸດ",  # vanphud
+        "ວັນພະຫັດ",  # vanphahad
+        "ວັນ​ສຸກ",  # vansuk
+        "ວັນເສົາ",  # vansao
+        "ວັນອາທິດ",  # vnoathid
+    ]
+    day_abbreviations = [
+        "",
+        "ວັນຈັນ",
+        "ວັນອັງຄານ",
+        "ວັນພຸດ",
+        "ວັນພະຫັດ",
+        "ວັນ​ສຸກ",
+        "ວັນເສົາ",
+        "ວັນອາທິດ",
+    ]
+
+    BE_OFFSET = 543
+
+    def year_full(self, year: int) -> str:
+        """Lao always use Buddhist Era (BE) which is CE + 543"""
+        year += self.BE_OFFSET
+        return f"{year:04d}"
+
+    def year_abbreviation(self, year: int) -> str:
+        """Lao always use Buddhist Era (BE) which is CE + 543"""
+        year += self.BE_OFFSET
+        return f"{year:04d}"[2:]
+
+    def _format_relative(
+        self,
+        humanized: str,
+        timeframe: TimeFrameLiteral,
+        delta: Union[float, int],
+    ) -> str:
+        """Lao normally doesn't have any space between words"""
+        if timeframe == "now":
+            return humanized
+
+        direction = self.past if delta < 0 else self.future
+        relative_string = direction.format(humanized)
+
+        if timeframe == "seconds":
+            relative_string = relative_string.replace(" ", "")
+
+        return relative_string
+
+
 class BengaliLocale(Locale):
 
     names = ["bn", "bn-bd", "bn-in"]

tests/test_arrow.py

@@ -2470,6 +2470,8 @@ def locale_list_no_weeks() -> List[str]:
         "ka-ge",
         "kk",
         "kk-kz",
+        # "lo",
+        # "lo-la",
     ]
 
     return tested_langs

tests/test_locales.py

@@ -1294,6 +1294,63 @@ def test_ordinal_number(self):
         assert self.locale.ordinal_number(1) == "1a"
 
 
+@pytest.mark.usefixtures("lang_locale")
+class TestLaotianLocale:
+    def test_year_full(self):
+        assert self.locale.year_full(2015) == "2558"
+
+    def test_year_abbreviation(self):
+        assert self.locale.year_abbreviation(2015) == "58"
+
+    def test_format_relative_now(self):
+        result = self.locale._format_relative("ດຽວນີ້", "now", 0)
+        assert result == "ດຽວນີ້"
+
+    def test_format_relative_past(self):
+        result = self.locale._format_relative("1 ຊົ່ວໂມງ", "hour", 1)
+        assert result == "ໃນ 1 ຊົ່ວໂມງ"
+        result = self.locale._format_relative("{0} ຊົ່ວໂມງ", "hours", 2)
+        assert result == "ໃນ {0} ຊົ່ວໂມງ"
+        result = self.locale._format_relative("ວິນາທີ", "seconds", 42)
+        assert result == "ໃນວິນາທີ"
+
+    def test_format_relative_future(self):
+        result = self.locale._format_relative("1 ຊົ່ວໂມງ", "hour", -1)
+        assert result == "1 ຊົ່ວໂມງ ກ່ອນຫນ້ານີ້"
+
+    def test_format_timeframe(self):
+        # minute(s)
+        assert self.locale._format_timeframe("minute", 1) == "ນາທີ"
+        assert self.locale._format_timeframe("minute", -1) == "ນາທີ"
+        assert self.locale._format_timeframe("minutes", 7) == "7 ນາທີ"
+        assert self.locale._format_timeframe("minutes", -20) == "20 ນາທີ"
+        # day(s)
+        assert self.locale._format_timeframe("day", 1) == "ມື້"
+        assert self.locale._format_timeframe("day", -1) == "ມື້"
+        assert self.locale._format_timeframe("days", 7) == "7 ມື້"
+        assert self.locale._format_timeframe("days", -20) == "20 ມື້"
+        # week(s)
+        assert self.locale._format_timeframe("week", 1) == "ອາທິດ"
+        assert self.locale._format_timeframe("week", -1) == "ອາທິດ"
+        assert self.locale._format_timeframe("weeks", 7) == "7 ອາທິດ"
+        assert self.locale._format_timeframe("weeks", -20) == "20 ອາທິດ"
+        # month(s)
+        assert self.locale._format_timeframe("month", 1) == "ເດືອນ"
+        assert self.locale._format_timeframe("month", -1) == "ເດືອນ"
+        assert self.locale._format_timeframe("months", 7) == "7 ເດືອນ"
+        assert self.locale._format_timeframe("months", -20) == "20 ເດືອນ"
+        # year(s)
+        assert self.locale._format_timeframe("year", 1) == "ປີ"
+        assert self.locale._format_timeframe("year", -1) == "ປີ"
+        assert self.locale._format_timeframe("years", 7) == "7 ປີ"
+        assert self.locale._format_timeframe("years", -20) == "20 ປີ"
+
+    def test_weekday(self):
+        dt = arrow.Arrow(2015, 4, 11, 17, 30, 00)
+        assert self.locale.day_name(dt.isoweekday()) == "ວັນເສົາ"
+        assert self.locale.day_abbreviation(dt.isoweekday()) == "ວັນເສົາ"
+
+
 @pytest.mark.usefixtures("lang_locale")
 class TestThaiLocale:
     def test_year_full(self):