[PATCH 17/25] qapi: Move context-free checking to the proper place

[Markus Armbruster <armbru@redhat.com>]

QAPISchemaCommand.check() and QAPISchemaEvent().check() check 'data'
is present when 'boxed': true.  That's context-free.  Move to
check_command() and check_event().

Tweak the error message while there.

check_exprs() & friends now check exactly what qapi-code-gen.txt calls
the second layer of syntax.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
---
 scripts/qapi/common.py                  | 16 ++++++++--------
 tests/qapi-schema/event-boxed-empty.err |  2 +-
 2 files changed, 9 insertions(+), 9 deletions(-)

diff --git a/scripts/qapi/common.py b/scripts/qapi/common.py
index ac4c898e51..7577120f12 100644
--- a/scripts/qapi/common.py
+++ b/scripts/qapi/common.py
@@ -767,10 +767,12 @@ def check_type(value, info, source,
 
 def check_command(expr, info):
     name = expr['command']
+    args = expr.get('data')
     boxed = expr.get('boxed', False)
 
-    check_type(expr.get('data'), info,
-               "'data' for command '%s'" % name,
+    if boxed and args is None:
+        raise QAPISemError(info, "'boxed': true requires 'data'")
+    check_type(args, info, "'data' for command '%s'" % name,
                allow_dict=not boxed)
     check_type(expr.get('returns'), info,
                "'returns' for command '%s'" % name,
@@ -779,10 +781,12 @@ def check_command(expr, info):
 
 def check_event(expr, info):
     name = expr['event']
+    args = expr.get('data')
     boxed = expr.get('boxed', False)
 
-    check_type(expr.get('data'), info,
-               "'data' for event '%s'" % name,
+    if boxed and args is None:
+        raise QAPISemError(info, "'boxed': true requires 'data'")
+    check_type(args, info, "'data' for event '%s'" % name,
                allow_dict=not boxed)
 
 
@@ -1691,8 +1695,6 @@ class QAPISchemaCommand(QAPISchemaEntity):
                     self.info,
                     "command's 'data' can take %s only with 'boxed': true"
                     % self.arg_type.describe())
-        elif self.boxed:
-            raise QAPISemError(self.info, "use of 'boxed' requires 'data'")
         if self._ret_type_name:
             self.ret_type = schema.resolve_type(
                 self._ret_type_name, self.info, "command's 'returns'")
@@ -1740,8 +1742,6 @@ class QAPISchemaEvent(QAPISchemaEntity):
                     self.info,
                     "event's 'data' can take %s only with 'boxed': true"
                     % self.arg_type.describe())
-        elif self.boxed:
-            raise QAPISemError(self.info, "use of 'boxed' requires 'data'")
 
     def visit(self, visitor):
         QAPISchemaEntity.visit(self, visitor)
diff --git a/tests/qapi-schema/event-boxed-empty.err b/tests/qapi-schema/event-boxed-empty.err
index 9c691b7d97..931c10b036 100644
--- a/tests/qapi-schema/event-boxed-empty.err
+++ b/tests/qapi-schema/event-boxed-empty.err
@@ -1,2 +1,2 @@
 tests/qapi-schema/event-boxed-empty.json: In event 'FOO':
-tests/qapi-schema/event-boxed-empty.json:2: use of 'boxed' requires 'data'
+tests/qapi-schema/event-boxed-empty.json:2: 'boxed': true requires 'data'
-- 
2.21.0