Add visitor for ExternFrameStatement to parser.

Author: hodgestar

source/openpulse/openpulse/ast.py

@@ -131,6 +131,15 @@ class CalibrationBlock(QASMNode):
     body: List[Statement]
 
 
+@dataclass
+class ExternFrameStatement(QASMNode):
+    """
+    Node representing an extern frame statement.
+    """
+
+    name: Identifier
+
+
 @dataclass
 class ExternPortStatement(QASMNode):
     """

source/openpulse/openpulse/parser.py

@@ -195,6 +195,9 @@ def visitCalibrationBlock(self, ctx: openpulseParser.CalibrationBlockContext):
                 body=[self.visit(statement) for statement in ctx.openpulseStatement()]
             )
 
+    def visitExternFrameStatement(self, ctx: openpulseParser.OpenpulseStatementContext):
+        return openpulse_ast.ExternFrameStatement(name=_visit_identifier(ctx.Identifier()))
+
     def visitExternPortStatement(self, ctx: openpulseParser.OpenpulseStatementContext):
         return openpulse_ast.ExternPortStatement(name=_visit_identifier(ctx.Identifier()))