[PATCH 15/37] qapi/common.py: split build_params into new file

[John Snow]

Including it in common.py creates a circular import dependency, because
schema relies on common.py. To type build_params properly, it needs to
be moved outside of the chain.

Signed-off-by: John Snow <jsnow@redhat.com>
---
 scripts/qapi/commands.py |  2 +-
 scripts/qapi/common.py   | 23 -----------------------
 scripts/qapi/events.py   |  2 +-
 scripts/qapi/params.py   | 40 ++++++++++++++++++++++++++++++++++++++++
 4 files changed, 42 insertions(+), 25 deletions(-)
 create mode 100644 scripts/qapi/params.py

diff --git a/scripts/qapi/commands.py b/scripts/qapi/commands.py
index 2e4b4de0fa..0c0fe854fe 100644
--- a/scripts/qapi/commands.py
+++ b/scripts/qapi/commands.py
@@ -14,10 +14,10 @@
 """
 
 from .common import (
-    build_params,
     c_name,
     mcgen,
 )
+from .params import build_params
 from .gen import QAPIGenCCode, QAPISchemaModularCVisitor, ifcontext
 
 
diff --git a/scripts/qapi/common.py b/scripts/qapi/common.py
index 38d380f0a9..0b1af694e6 100644
--- a/scripts/qapi/common.py
+++ b/scripts/qapi/common.py
@@ -209,26 +209,3 @@ def gen_endif(ifcond: Sequence[str]) -> str:
 #endif /* %(cond)s */
 ''', cond=ifc)
     return ret
-
-
-def build_params(arg_type,
-                 boxed: bool,
-                 extra: Optional[str] = None) -> str:
-    ret = ''
-    sep = ''
-    if boxed:
-        assert arg_type
-        ret += '%s arg' % arg_type.c_param_type()
-        sep = ', '
-    elif arg_type:
-        assert not arg_type.variants
-        for memb in arg_type.members:
-            ret += sep
-            sep = ', '
-            if memb.optional:
-                ret += 'bool has_%s, ' % c_name(memb.name)
-            ret += '%s %s' % (memb.type.c_param_type(),
-                              c_name(memb.name))
-    if extra:
-        ret += sep + extra
-    return ret if ret else 'void'
diff --git a/scripts/qapi/events.py b/scripts/qapi/events.py
index 6b3afa14d7..75eda72534 100644
--- a/scripts/qapi/events.py
+++ b/scripts/qapi/events.py
@@ -13,11 +13,11 @@
 """
 
 from .common import (
-    build_params,
     c_enum_const,
     c_name,
     mcgen,
 )
+from .params import build_params
 from .gen import QAPISchemaModularCVisitor, ifcontext
 from .schema import QAPISchemaEnumMember
 from .types import gen_enum, gen_enum_lookup
diff --git a/scripts/qapi/params.py b/scripts/qapi/params.py
new file mode 100644
index 0000000000..4d4b02f60d
--- /dev/null
+++ b/scripts/qapi/params.py
@@ -0,0 +1,40 @@
+#
+# QAPI helper library
+#
+# Copyright IBM, Corp. 2011
+# Copyright (c) 2013-2018 Red Hat Inc.
+#
+# Authors:
+#  Anthony Liguori <aliguori@us.ibm.com>
+#  Markus Armbruster <armbru@redhat.com>
+#
+# This work is licensed under the terms of the GNU GPL, version 2.
+# See the COPYING file in the top-level directory.
+
+from typing import Optional
+
+from .common import c_name
+from .schema import QAPISchemaObjectType
+
+
+def build_params(arg_type: Optional[QAPISchemaObjectType],
+                 boxed: bool,
+                 extra: Optional[str] = None) -> str:
+    ret = ''
+    sep = ''
+    if boxed:
+        assert arg_type
+        ret += '%s arg' % arg_type.c_param_type()
+        sep = ', '
+    elif arg_type:
+        assert not arg_type.variants
+        for memb in arg_type.members:
+            ret += sep
+            sep = ', '
+            if memb.optional:
+                ret += 'bool has_%s, ' % c_name(memb.name)
+            ret += '%s %s' % (memb.type.c_param_type(),
+                              c_name(memb.name))
+    if extra:
+        ret += sep + extra
+    return ret if ret else 'void'
-- 
2.26.2