1 files changed, 35 insertions, 0 deletions
diff --git a/src/argaze/DataStructures.py b/src/argaze/DataStructures.py
index 4dab036..5fe7ce6 100644
--- a/src/argaze/DataStructures.py
+++ b/src/argaze/DataStructures.py
@@ -2,6 +2,7 @@
 
 import collections
 import json
+import bisect
 
 class DictObject():
     """Convert dictionnary into object"""
@@ -63,10 +64,44 @@ class TimeStampedBuffer(collections.OrderedDict):
         """Easing FIFO access mode"""
         return self.popitem(last=False)
 
+    def pop_first_until(self, ts):
+        """Pop all item until a given timestamped value and returning the last poped item"""
+
+        popep_ts, poped_value = self.pop_first()
+
+        while popep_ts != ts:
+            popep_ts, poped_value = self.pop_first()
+
+        return popep_ts, poped_value
+
     def pop_last(self):
         """Easing FIFO access mode"""
         return self.popitem(last=True)
 
+    def pop_last_until(self, ts):
+        """Pop all item until a given timestamped value and returning the last poped item"""
+
+        popep_ts, poped_value = self.pop_last()
+
+        while popep_ts != ts:
+            popep_ts, poped_value = self.pop_last()
+
+        return popep_ts, poped_value
+
+    def get_last_before(self, ts):
+        """Retreive last item timestamp before a given timestamp value."""
+
+        ts_list = list(self.keys())
+        last_before_index = bisect.bisect_left(ts_list, ts) - 1
+
+        if last_before_index > 0:
+
+            return ts_list[last_before_index]
+            
+        else:
+            
+            return None
+
     def export_as_json(self, filepath):
         """Write buffer content into a json file"""
         try: