[PATCH v2 11/12] qapi/schema: Name the builtin module "" instead of None

[John Snow]

Instead of using None as the built-in module filename, use an empty
string instead. This allows us to clarify the type of various interfaces
dealing with module names as always taking a string, which saves us from
having to use Optional[str] everywhere.

Signed-off-by: John Snow <jsnow@redhat.com>
---
 scripts/qapi/gen.py                      |  6 +++---
 scripts/qapi/schema.py                   | 12 ++++++------
 scripts/qapi/types.py                    |  2 +-
 scripts/qapi/visit.py                    |  2 +-
 tests/qapi-schema/comments.out           |  2 +-
 tests/qapi-schema/doc-good.out           |  2 +-
 tests/qapi-schema/empty.out              |  2 +-
 tests/qapi-schema/event-case.out         |  2 +-
 tests/qapi-schema/include-repetition.out |  2 +-
 tests/qapi-schema/include-simple.out     |  2 +-
 tests/qapi-schema/indented-expr.out      |  2 +-
 tests/qapi-schema/qapi-schema-test.out   |  2 +-
 12 files changed, 19 insertions(+), 19 deletions(-)

diff --git a/scripts/qapi/gen.py b/scripts/qapi/gen.py
index 2dd99635e74..1933090a2a0 100644
--- a/scripts/qapi/gen.py
+++ b/scripts/qapi/gen.py
@@ -310,14 +310,14 @@ def write(self, output_dir: str, opt_builtins: bool = 
False) -> None:
             genc.write(output_dir)
             genh.write(output_dir)
 
-    def _begin_system_module(self, name: None) -> None:
+    def _begin_system_module(self, name: str) -> None:
         pass
 
     def _begin_user_module(self, name: str) -> None:
         pass
 
-    def visit_module(self, name: Optional[str]) -> None:
-        if name is None:
+    def visit_module(self, name: str) -> None:
+        if not name:
             if self._builtin_blurb:
                 self._add_system_module('builtin', self._builtin_blurb)
                 self._begin_system_module(name)
diff --git a/scripts/qapi/schema.py b/scripts/qapi/schema.py
index 0449771dfe5..0235208966a 100644
--- a/scripts/qapi/schema.py
+++ b/scripts/qapi/schema.py
@@ -69,7 +69,7 @@ def check_doc(self):
 
     def _set_module(self, schema, info):
         assert self._checked
-        self._module = schema.module_by_fname(info.fname if info else None)
+        self._module = schema.module_by_fname(info.fname)
         self._module.add_entity(self)
 
     def set_module(self, schema):
@@ -826,7 +826,7 @@ def __init__(self, fname):
         self._entity_dict = {}
         self._module_dict = OrderedDict()
         self._schema_dir = os.path.dirname(fname)
-        self._make_module(None)  # built-ins
+        self._make_module(QAPISourceInfo.builtin().fname)  # built-ins
         self._make_module(fname)
         self._predefining = True
         self._def_predefineds()
@@ -871,10 +871,10 @@ def resolve_type(self, name, info, what):
                 info, "%s uses unknown type '%s'" % (what, name))
         return typ
 
-    def _module_name(self, fname):
-        if fname is None:
-            return None
-        return os.path.relpath(fname, self._schema_dir)
+    def _module_name(self, fname: str) -> str:
+        if fname:
+            return os.path.relpath(fname, self._schema_dir)
+        return fname
 
     def _make_module(self, fname):
         name = self._module_name(fname)
diff --git a/scripts/qapi/types.py b/scripts/qapi/types.py
index a3a16284006..12eeea3aaff 100644
--- a/scripts/qapi/types.py
+++ b/scripts/qapi/types.py
@@ -272,7 +272,7 @@ def __init__(self, prefix: str):
             prefix, 'qapi-types', ' * Schema-defined QAPI types',
             ' * Built-in QAPI types', __doc__)
 
-    def _begin_system_module(self, name: None) -> None:
+    def _begin_system_module(self, name: str) -> None:
         self._genc.preamble_add(mcgen('''
 #include "qemu/osdep.h"
 #include "qapi/dealloc-visitor.h"
diff --git a/scripts/qapi/visit.py b/scripts/qapi/visit.py
index 3f49c307c56..76e34ee7f02 100644
--- a/scripts/qapi/visit.py
+++ b/scripts/qapi/visit.py
@@ -305,7 +305,7 @@ def __init__(self, prefix: str):
             prefix, 'qapi-visit', ' * Schema-defined QAPI visitors',
             ' * Built-in QAPI visitors', __doc__)
 
-    def _begin_system_module(self, name: None) -> None:
+    def _begin_system_module(self, name: str) -> None:
         self._genc.preamble_add(mcgen('''
 #include "qemu/osdep.h"
 #include "qapi/error.h"
diff --git a/tests/qapi-schema/comments.out b/tests/qapi-schema/comments.out
index 08aba8354e2..02000c06e5e 100644
--- a/tests/qapi-schema/comments.out
+++ b/tests/qapi-schema/comments.out
@@ -1,4 +1,4 @@
-module "None"
+module ""
 object q_empty
 enum QType
     prefix QTYPE
diff --git a/tests/qapi-schema/doc-good.out b/tests/qapi-schema/doc-good.out
index 83a3d9bd69b..494533d7479 100644
--- a/tests/qapi-schema/doc-good.out
+++ b/tests/qapi-schema/doc-good.out
@@ -1,4 +1,4 @@
-module "None"
+module ""
 object q_empty
 enum QType
     prefix QTYPE
diff --git a/tests/qapi-schema/empty.out b/tests/qapi-schema/empty.out
index 0dac23c80c1..059caa4e1d2 100644
--- a/tests/qapi-schema/empty.out
+++ b/tests/qapi-schema/empty.out
@@ -1,4 +1,4 @@
-module "None"
+module ""
 object q_empty
 enum QType
     prefix QTYPE
diff --git a/tests/qapi-schema/event-case.out b/tests/qapi-schema/event-case.out
index ace511ba5a9..4d9d2b519f4 100644
--- a/tests/qapi-schema/event-case.out
+++ b/tests/qapi-schema/event-case.out
@@ -1,4 +1,4 @@
-module "None"
+module ""
 object q_empty
 enum QType
     prefix QTYPE
diff --git a/tests/qapi-schema/include-repetition.out 
b/tests/qapi-schema/include-repetition.out
index f7ab4987943..31d64631b66 100644
--- a/tests/qapi-schema/include-repetition.out
+++ b/tests/qapi-schema/include-repetition.out
@@ -1,4 +1,4 @@
-module "None"
+module ""
 object q_empty
 enum QType
     prefix QTYPE
diff --git a/tests/qapi-schema/include-simple.out 
b/tests/qapi-schema/include-simple.out
index 81bdeb887b6..1b35b329571 100644
--- a/tests/qapi-schema/include-simple.out
+++ b/tests/qapi-schema/include-simple.out
@@ -1,4 +1,4 @@
-module "None"
+module ""
 object q_empty
 enum QType
     prefix QTYPE
diff --git a/tests/qapi-schema/indented-expr.out 
b/tests/qapi-schema/indented-expr.out
index 361a58185e6..aed689e7bd6 100644
--- a/tests/qapi-schema/indented-expr.out
+++ b/tests/qapi-schema/indented-expr.out
@@ -1,4 +1,4 @@
-module "None"
+module ""
 object q_empty
 enum QType
     prefix QTYPE
diff --git a/tests/qapi-schema/qapi-schema-test.out 
b/tests/qapi-schema/qapi-schema-test.out
index 4f5ab9fd596..4a899ba63ec 100644
--- a/tests/qapi-schema/qapi-schema-test.out
+++ b/tests/qapi-schema/qapi-schema-test.out
@@ -1,4 +1,4 @@
-module "None"
+module ""
 object q_empty
 enum QType
     prefix QTYPE
-- 
2.26.2