feat: implement ListResponse and SearchQuery index_0 properties

doc/changelog.rst

@@ -6,6 +6,10 @@ Changelog
 Added
 ^^^^^
 - Implement :meth:`Schema.get_attribute <scim2_models.Schema.get_attribute>`.
+- Implement :meth:`ListResponse.start_index_0 <scim2_models.ListResponse.start_index_0>`
+  and :meth:`ListResponse.start_index_1 <scim2_models.ListResponse.start_index_1>`
+  and :meth:`SearchRequest.start_index_0 <scim2_models.SearchRequest.start_index_0>`
+  and :meth:`SearchRequest.start_index_1 <scim2_models.SearchRequest.start_index_1>`.
 
 [0.2.10] - 2024-12-02
 ---------------------

scim2_models/rfc7644/list_response.py

@@ -121,3 +121,17 @@ def check_results_number(
             )
 
         return obj
+
+    @property
+    def start_index_0(self):
+        """The 0 indexed start index."""
+        return self.start_index - 1 if self.start_index is not None else None
+
+    @property
+    def stop_index_0(self):
+        """The 0 indexed stop index."""
+        return (
+            self.start_index_0 + self.count
+            if self.start_index_0 is not None and self.count is not None
+            else None
+        )

scim2_models/rfc7644/search_request.py

@@ -76,3 +76,17 @@ def attributes_validator(self):
             )
 
         return self
+
+    @property
+    def start_index_0(self):
+        """The 0 indexed start index."""
+        return self.start_index - 1 if self.start_index is not None else None
+
+    @property
+    def stop_index_0(self):
+        """The 0 indexed stop index."""
+        return (
+            self.start_index_0 + self.count
+            if self.start_index_0 is not None and self.count is not None
+            else None
+        )