[PATCH 05/12] qapi/gen: use './builtin' for the built-in module name

[John Snow]

Use this in preference to 'None', which helps remove some edge cases in
the typing.

Signed-off-by: John Snow <jsnow@redhat.com>
---
 scripts/qapi/gen.py | 27 +++++++++++++--------------
 1 file changed, 13 insertions(+), 14 deletions(-)

diff --git a/scripts/qapi/gen.py b/scripts/qapi/gen.py
index a6dc991b1d03..0c5d1fee6088 100644
--- a/scripts/qapi/gen.py
+++ b/scripts/qapi/gen.py
@@ -245,23 +245,23 @@ def __init__(self,
         self._pydoc = pydoc
         self._genc: Optional[QAPIGenC] = None
         self._genh: Optional[QAPIGenH] = None
-        self._module: Dict[Optional[str], Tuple[QAPIGenC, QAPIGenH]] = {}
+        self._module: Dict[str, Tuple[QAPIGenC, QAPIGenH]] = {}
         self._main_module: Optional[str] = None
 
     @staticmethod
-    def _is_user_module(name: Optional[str]) -> bool:
-        return bool(name and not name.startswith('./'))
+    def _is_user_module(name: str) -> bool:
+        return not name.startswith('./')
 
     @staticmethod
-    def _is_builtin_module(name: Optional[str]) -> bool:
-        return not name
+    def _is_builtin_module(name: str) -> bool:
+        return name == './builtin'
 
-    def _module_dirname(self, name: Optional[str]) -> str:
+    def _module_dirname(self, name: str) -> str:
         if self._is_user_module(name):
             return os.path.dirname(name)
         return ''
 
-    def _module_basename(self, what: str, name: Optional[str]) -> str:
+    def _module_basename(self, what: str, name: str) -> str:
         ret = '' if self._is_builtin_module(name) else self._prefix
         if self._is_user_module(name):
             basename = os.path.basename(name)
@@ -269,15 +269,14 @@ def _module_basename(self, what: str, name: 
Optional[str]) -> str:
             if name != self._main_module:
                 ret += '-' + os.path.splitext(basename)[0]
         else:
-            name = name[2:] if name else 'builtin'
-            ret += re.sub(r'-', '-' + name + '-', what)
+            ret += re.sub(r'-', '-' + name[2:] + '-', what)
         return ret
 
-    def _module_filename(self, what: str, name: Optional[str]) -> str:
+    def _module_filename(self, what: str, name: str) -> str:
         return os.path.join(self._module_dirname(name),
                             self._module_basename(what, name))
 
-    def _add_module(self, name: Optional[str], blurb: str) -> None:
+    def _add_module(self, name: str, blurb: str) -> None:
         basename = self._module_filename(self._what, name)
         genc = QAPIGenC(basename + '.c', blurb, self._pydoc)
         genh = QAPIGenH(basename + '.h', blurb, self._pydoc)
@@ -290,8 +289,8 @@ def _add_user_module(self, name: str, blurb: str) -> None:
             self._main_module = name
         self._add_module(name, blurb)
 
-    def _add_system_module(self, name: Optional[str], blurb: str) -> None:
-        self._add_module(name and './' + name, blurb)
+    def _add_system_module(self, name: str, blurb: str) -> None:
+        self._add_module(f"./{name}", blurb)
 
     def write(self, output_dir: str, opt_builtins: bool = False) -> None:
         for name in self._module:
@@ -310,7 +309,7 @@ def _begin_user_module(self, name: str) -> None:
     def visit_module(self, name: Optional[str]) -> None:
         if name is None:
             if self._builtin_blurb:
-                self._add_system_module(None, self._builtin_blurb)
+                self._add_system_module('builtin', self._builtin_blurb)
                 self._begin_system_module(name)
             else:
                 # The built-in module has not been created.  No code may
-- 
2.26.2