Deprecated natural-language timespan inequalities.

Tag #1491.
Abjad · Oct 30, 2022 · 40d2b3d · 40d2b3d
1 parent f2fbb76
commit 40d2b3d
Showing 1 changed file with 9 additions and 7 deletions.
diff --git a/abjad/timespan.py b/abjad/timespan.py
@@ -693,9 +693,10 @@ def __sub__(self, argument) -> "TimespanList":
                 stop_offset=new_stop_offset,
             )
             timespans.append(timespan)
-        elif argument.starts_when_timespan_starts(
-            self
-        ) and argument.stops_before_timespan_stops(self):
+        elif (
+            argument.start_offset == self.start_offset
+            and argument.stop_offset < self.stop_offset
+        ):
             new_start_offset = argument.stop_offset
             new_stop_offset = self.stop_offset
             timespan = dataclasses.replace(
@@ -704,9 +705,10 @@ def __sub__(self, argument) -> "TimespanList":
                 stop_offset=new_stop_offset,
             )
             timespans.append(timespan)
-        elif argument.stops_when_timespan_stops(
-            self
-        ) and argument.starts_after_timespan_starts(self):
+        elif (
+            argument.stop_offset == self.stop_offset
+            and self.start_offset < argument.start_offset
+        ):
             new_start_offset = self.start_offset
             new_stop_offset = argument.start_offset
             timespan = dataclasses.replace(
@@ -814,7 +816,7 @@ def _as_postscript(
 
     def _can_fuse(self, argument):
         if isinstance(argument, type(self)):
-            return bool(self & argument) or self.stops_when_timespan_starts(argument)
+            return bool(self & argument) or self.stop_offset == argument.start_offset
         return False
 
     @staticmethod