Remove HSPICE netlist comments for plot_nets

gplugins/klayout/netlist_spice_reader.py

@@ -0,0 +1,11 @@
+import klayout.db as kdb
+
+
+class NoCommentReader(kdb.NetlistSpiceReaderDelegate):
+    """KLayout Spice reader without comments after $. This allows checking the netlist for HSPICE"""
+
+    def parse_element(self, s: str, element: str) -> kdb.ParseElementData:
+        if "$" in s:
+            s = s.split("$")[0]  # Don't take comments into account
+        parsed = super().parse_element(s, element)
+        return parsed

gplugins/klayout/plot_nets.py

@@ -1,10 +1,12 @@
 import itertools
-from logging import warning
 from pathlib import Path
 
 import klayout.db as kdb
 import matplotlib.pyplot as plt
 import networkx as nx
+from gdsfactory.config import logger
+
+from gplugins.klayout.netlist_spice_reader import NoCommentReader
 
 
 def _get_subcircuit_name(subcircuit: kdb.SubCircuit) -> str:
@@ -81,11 +83,11 @@ def plot_nets(
             l2n.read(str(filepath))
             netlist = l2n.netlist()
         case ".spice":
-            reader = kdb.NetlistSpiceReader()
+            reader = kdb.NetlistSpiceReader(NoCommentReader())
             netlist = kdb.Netlist()
             netlist.read(str(filepath), reader)
         case _:
-            warning("Assuming file is KLayout native LayoutToNetlist file")
+            logger.warning("Assuming file is KLayout native LayoutToNetlist file")
             l2n = kdb.LayoutToNetlist()
             l2n.read(str(filepath))
             netlist = l2n.netlist()

gplugins/klayout/tests/test_netlist_spice_reader.py

@@ -0,0 +1,25 @@
+import pytest
+
+from gplugins.klayout.netlist_spice_reader import NoCommentReader
+
+
+@pytest.mark.parametrize(
+    "s,element,expected_name,expected_nets",
+    [
+        ("1 2 POS", "X", "POS", {"1", "2"}),
+        ("2 3 NEG $ This is a comment", "X", "NEG", {"2", "3"}),
+        (
+            "5 4 some_elem some_variable=1 $ This is a comment",
+            "X",
+            "some_elem",
+            {"5", "4"},
+        ),
+    ],
+)
+def test_NoCommentReader(
+    s: str, element: str, expected_name: str, expected_nets: set[str]
+) -> None:
+    reader = NoCommentReader()
+    parsed = reader.parse_element(s, element)
+    assert set(parsed.net_names) == expected_nets
+    assert parsed.model_name == expected_name.upper()