removed redundancy

src/qat/ir/instructions.py

@@ -429,25 +429,6 @@ def __repr__(self):
         return f"delay {str(self.time)}"
 
 
-def pulse_channel_to_strs(targets):
-    targets = [targets] if not isinstance(targets, list) else targets
-    unique_targets = set()
-    for target in (
-        chan
-        for val in targets
-        for chan in (val.pulse_channels.values() if isinstance(val, Qubit) else [val])
-    ):
-        if isinstance(target, str):
-            unique_targets.add(target)
-        elif isinstance(target, PulseChannel):
-            unique_targets.add(target.full_id())
-        else:
-            raise ValueError(
-                f"Attempted to add a non PulseChannel ({target}) to the instruction."
-            )
-    return set(sorted(unique_targets))
-
-
 class GroupInstruction(QuantumInstruction):
     """
     Some instructions are just a collection of multiple targets with a label
@@ -466,14 +447,29 @@ def __init__(
 
     @field_validator("quantum_targets", mode="before")
     @classmethod
-    def _pulse_channel_to_strs(cls, targets):
-        return pulse_channel_to_strs(targets)
+    def _pulse_channels_to_strs(cls, targets):
+        targets = [targets] if not isinstance(targets, list) else targets
+        unique_targets = set()
+        for target in (
+            chan
+            for val in targets
+            for chan in (val.pulse_channels.values() if isinstance(val, Qubit) else [val])
+        ):
+            if isinstance(target, str):
+                unique_targets.add(target)
+            elif isinstance(target, PulseChannel):
+                unique_targets.add(target.full_id())
+            else:
+                raise ValueError(
+                    f"Attempted to add a non PulseChannel ({target}) to the instruction."
+                )
+        return set(sorted(unique_targets))
 
     def add_channels(
         self,
         sync_channels: Union[Qubit, PulseChannel, List[Union[Qubit, PulseChannel]]],
     ):
-        new_targets = pulse_channel_to_strs(sync_channels)
+        new_targets = self._pulse_channels_to_strs(sync_channels)
         self.quantum_targets.update(new_targets)
         return self
 
@@ -554,13 +550,13 @@ def __init__(
         # TODO: should we be storing properties of the pulse channel in the instruction?
         # It is only used for calcualting the duration (which was previously done externally).
         if not sample_time:
+            chan = quantum_targets
+            if isinstance(chan, list):
+                chan = chan[0]
             if not isinstance(chan, PulseChannel):
                 raise (
                     ValueError("Sample time cannot be determined without a pulse channel.")
                 )
-            chan = quantum_targets
-            if isinstance(chan, list):
-                chan = chan[0]
             sample_time = chan.sample_time
 
         super().__init__(