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| author | John Snow <jsnow@redhat.com> | 2021-04-21 14:20:23 -0400 |
|---|---|---|
| committer | Markus Armbruster <armbru@redhat.com> | 2021-04-30 12:59:54 +0200 |
| commit | 7a783ce5b5a3ac4762b866e22370dd4fb30b91bf (patch) | |
| tree | 65c8884bd2830681e1ca26a71a1d5feb70777951 | |
| parent | 4918bb7defbdcb1e27cc2adf4e1604486d778ece (diff) | |
| download | qemu-7a783ce5b5a3ac4762b866e22370dd4fb30b91bf.zip qemu-7a783ce5b5a3ac4762b866e22370dd4fb30b91bf.tar.gz qemu-7a783ce5b5a3ac4762b866e22370dd4fb30b91bf.tar.bz2 | |
qapi/expr.py: Add casts in a few select cases
Casts are instructions to the type checker only, they aren't "safe" and
should probably be avoided in general. In this case, when we perform
type checking on a nested structure, the type of each field does not
"stick".
(See PEP 647 for an example of "type narrowing" that does "stick".
It is available in Python 3.10, so we can't use it yet.)
We don't need to assert that something is a str if we've already checked
or asserted that it is -- use a cast instead for these cases.
Signed-off-by: John Snow <jsnow@redhat.com>
Message-Id: <20210421182032.3521476-9-jsnow@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
| -rw-r--r-- | scripts/qapi/expr.py | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/scripts/qapi/expr.py b/scripts/qapi/expr.py index 03624bd..f3a4a85 100644 --- a/scripts/qapi/expr.py +++ b/scripts/qapi/expr.py @@ -15,7 +15,7 @@ # See the COPYING file in the top-level directory. import re -from typing import Dict, Optional +from typing import Dict, Optional, cast from .common import c_name from .error import QAPISemError @@ -261,7 +261,7 @@ def check_enum(expr, info): def check_struct(expr, info): - name = expr['struct'] + name = cast(str, expr['struct']) # Checked in check_exprs members = expr['data'] check_type(members, info, "'data'", allow_dict=name) @@ -269,7 +269,7 @@ def check_struct(expr, info): def check_union(expr, info): - name = expr['union'] + name = cast(str, expr['union']) # Checked in check_exprs base = expr.get('base') discriminator = expr.get('discriminator') members = expr['data'] @@ -368,8 +368,8 @@ def check_exprs(exprs): else: raise QAPISemError(info, "expression is missing metatype") - name = expr[meta] - check_name_is_str(name, info, "'%s'" % meta) + check_name_is_str(expr[meta], info, "'%s'" % meta) + name = cast(str, expr[meta]) info.set_defn(meta, name) check_defn_name_str(name, info, meta) |