Work on more readable ast for express schema parser

src/ifcopenshell-python/ifcopenshell/express/bootstrap.py

@@ -161,7 +161,7 @@ statements = []
 terminals = reduce(lambda x, y: x | y, (find_bytype(e, Terminal) for id, e in express))
 keywords = list(filter(operator.attrgetter("is_keyword"), terminals))
 negated_keywords = map(lambda s: "~%s" % s, keywords)
-no_action = {"letter", "digit", "digits", "real_literal", "integer_literal"}
+no_action = {"letter", "digit", "digits", "real_literal", "integer_literal", "string_literal", "simple_string_literal", "letter", "not_quote", "not_paren_star_quote_special"}
 
 while True:
     emitted_in_loop = set()
@@ -199,8 +199,8 @@ for id in to_emit:
         stmt = "(%s)%s" % (stmt, action)
     statements.append("%s << %s" % (id, stmt))
 
-print(
-    """
+if __name__ == "__main__":
+    print("""
 # This file is generated by IfcOpenShell ifcexpressparser bootstrap.py
 
 import os
@@ -238,6 +238,5 @@ if __name__ == "__main__":
         mdl = importlib.import_module(output)
         mdl.Generator(m).emit()
     sys.stdout.write(m.schema.name)
-"""
-    % ("\n        ".join(statements))
-)
+""" % ("\n        ".join(statements))
+    )