Cirq web supports LineQubits (#5211)

This would be to fix #5173

cirq-web/cirq_web/circuits/circuit.py

@@ -87,5 +87,10 @@ def _build_3D_symbol(self, operation, moment) -> Operation3DSymbol:
         symbol_info = resolve_operation(operation, self._resolvers)
         location_info = []
         for qubit in operation.qubits:
-            location_info.append({'row': qubit.row, 'col': qubit.col})
+            if isinstance(qubit, cirq.GridQubit):
+                location_info.append({'row': qubit.row, 'col': qubit.col})
+            elif isinstance(qubit, cirq.LineQubit):
+                location_info.append({'row': qubit.x, 'col': 0})
+            else:
+                raise ValueError('Unsupported qubit type')
         return Operation3DSymbol(symbol_info.labels, location_info, symbol_info.colors, moment)

cirq-web/cirq_web/circuits/circuit_test.py

@@ -14,6 +14,8 @@
 import cirq
 import cirq_web
 
+import pytest
+
 
 def strip_ws(string):
     return "".join(string.split())
@@ -28,9 +30,9 @@ def test_circuit_init_type():
     assert isinstance(circuit3d, cirq_web.Circuit3D)
 
 
-def test_circuit_client_code():
-    qubits = [cirq.GridQubit(x, y) for x in range(2) for y in range(2)]
-    moment = cirq.Moment(cirq.H(qubits[0]))
+@pytest.mark.parametrize('qubit', [cirq.GridQubit(0, 0), cirq.LineQubit(0)])
+def test_circuit_client_code(qubit):
+    moment = cirq.Moment(cirq.H(qubit))
     circuit = cirq_web.Circuit3D(cirq.Circuit(moment))
 
     circuit_obj = [
@@ -64,6 +66,14 @@ def test_circuit_client_code():
     assert strip_ws(circuit.get_client_code()) == strip_ws(expected_client_code)
 
 
+def test_circuit_client_code_unsupported_qubit_type():
+    moment = cirq.Moment(cirq.H(cirq.NamedQubit('q0')))
+    circuit = cirq_web.Circuit3D(cirq.Circuit(moment))
+
+    with pytest.raises(ValueError, match='Unsupported qubit type'):
+        circuit.get_client_code()
+
+
 def test_circuit_default_bundle_name():
     qubits = [cirq.GridQubit(x, y) for x in range(2) for y in range(2)]
     moment = cirq.Moment(cirq.H(qubits[0]))