Add Parser for News slug

apps/utils/parsers.py

@@ -0,0 +1,43 @@
+
+
+class NewsSlug:
+    def __init__(self, value=None, locale=None, count=0):
+        self.value = value
+        self.locale = locale
+        self.count = count
+
+    @classmethod
+    def parse(cls, raw_slug, country_codes):
+        slug, *rest = raw_slug.split('-')
+        instance = NewsSlug()
+
+        if len(rest) >= 1 and rest[-1] in country_codes:
+            instance.value = '-'.join([slug, *rest[:-1]])
+            instance.locale = rest[-1]
+        elif len(rest) >= 2 and rest[-1].isdigit() and rest[-2] in country_codes:
+            instance.value = '-'.join([slug, *rest[:-2]])
+            instance.locale = rest[-2]
+            instance.count = int(rest[-1])
+        else:
+            instance.value = '-'.join([slug, *rest])
+
+        return instance
+
+    def __lt__(self, other):
+        return self.value < other.value
+
+    def __str__(self):
+        if self.value is None:
+            raise ValueError('No value for slug')
+
+        slug_parts = [self.value]
+        if self.locale is not None:
+            slug_parts.append(self.locale)
+
+        if self.count != 0:
+            slug_parts.append(str(self.count))
+
+        return '-'.join(slug_parts)
+
+    def __repr__(self):
+        return f'<{self.__class__.__name__} {self.value}, {self.locale}, {self.count}>'