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qapi/parser: add QAPIExpression type

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This patch creates a new type, QAPIExpression, which represents a parsed
expression complete with QAPIDoc and QAPISourceInfo.

This patch turns parser.exprs into a list of QAPIExpression instead,
and adjusts expr.py to match.

This allows the types we specify in parser.py to be "remembered" all the
way through expr.py and into schema.py. Several assertions around
packing and unpacking this data can be removed as a result.

It also corrects a harmless typing error.  Before the patch,
check_exprs() allegedly takes a List[_JSONObject].  It actually takes
a list of dicts of the form

    {'expr': E, 'info': I, 'doc': D}

where E is of type _ExprValue, I is of type QAPISourceInfo, and D is
of type QAPIDoc.  Key 'doc' is optional.  This is not a _JSONObject!
Passes type checking anyway, because _JSONObject is Dict[str, object].

Signed-off-by: John Snow <jsnow@redhat.com>
Message-Id: <20230215000011.1725012-5-jsnow@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
[Commit message amended to point out the typing fix]
This commit is contained in:
John Snow 2023-02-14 19:00:09 -05:00 committed by Markus Armbruster
parent c60caf8086
commit 420110591c
3 changed files with 100 additions and 100 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

82
scripts/qapi/expr.py
View file

@ -43,7 +43,7 @@
from .common import c_name
from .error import QAPISemError
from .parser import QAPIDoc
from .parser import QAPIExpression
from .source import QAPISourceInfo
@ -228,12 +228,11 @@ def pprint(elems: Iterable[str]) -> str:
pprint(unknown), pprint(allowed)))
def check_flags(expr: _JSONObject, info: QAPISourceInfo) -> None:
def check_flags(expr: QAPIExpression) -> None:
"""
Ensure flag members (if present) have valid values.
:param expr: The expression to validate.
:param info: QAPI schema source file information.
:raise QAPISemError:
When certain flags have an invalid value, or when
@ -242,18 +241,18 @@ def check_flags(expr: _JSONObject, info: QAPISourceInfo) -> None:
for key in ('gen', 'success-response'):
if key in expr and expr[key] is not False:
raise QAPISemError(
info, "flag '%s' may only use false value" % key)
expr.info, "flag '%s' may only use false value" % key)
for key in ('boxed', 'allow-oob', 'allow-preconfig', 'coroutine'):
if key in expr and expr[key] is not True:
raise QAPISemError(
info, "flag '%s' may only use true value" % key)
expr.info, "flag '%s' may only use true value" % key)
if 'allow-oob' in expr and 'coroutine' in expr:
# This is not necessarily a fundamental incompatibility, but
# we don't have a use case and the desired semantics isn't
# obvious. The simplest solution is to forbid it until we get
# a use case for it.
raise QAPISemError(info, "flags 'allow-oob' and 'coroutine' "
"are incompatible")
raise QAPISemError(
expr.info, "flags 'allow-oob' and 'coroutine' are incompatible")
def check_if(expr: _JSONObject, info: QAPISourceInfo, source: str) -> None:
@ -446,12 +445,11 @@ def check_features(features: Optional[object],
check_if(feat, info, source)
def check_enum(expr: _JSONObject, info: QAPISourceInfo) -> None:
def check_enum(expr: QAPIExpression) -> None:
"""
Normalize and validate this expression as an ``enum`` definition.
:param expr: The expression to validate.
:param info: QAPI schema source file information.
:raise QAPISemError: When ``expr`` is not a valid ``enum``.
:return: None, ``expr`` is normalized in-place as needed.
@ -459,6 +457,7 @@ def check_enum(expr: _JSONObject, info: QAPISourceInfo) -> None:
name = expr['enum']
members = expr['data']
prefix = expr.get('prefix')
info = expr.info
if not isinstance(members, list):
raise QAPISemError(info, "'data' must be an array")
@ -485,12 +484,11 @@ def check_enum(expr: _JSONObject, info: QAPISourceInfo) -> None:
check_features(member.get('features'), info)
def check_struct(expr: _JSONObject, info: QAPISourceInfo) -> None:
def check_struct(expr: QAPIExpression) -> None:
"""
Normalize and validate this expression as a ``struct`` definition.
:param expr: The expression to validate.
:param info: QAPI schema source file information.
:raise QAPISemError: When ``expr`` is not a valid ``struct``.
:return: None, ``expr`` is normalized in-place as needed.
@ -498,16 +496,15 @@ def check_struct(expr: _JSONObject, info: QAPISourceInfo) -> None:
name = cast(str, expr['struct']) # Checked in check_exprs
members = expr['data']
check_type(members, info, "'data'", allow_dict=name)
check_type(expr.get('base'), info, "'base'")
check_type(members, expr.info, "'data'", allow_dict=name)
check_type(expr.get('base'), expr.info, "'base'")
def check_union(expr: _JSONObject, info: QAPISourceInfo) -> None:
def check_union(expr: QAPIExpression) -> None:
"""
Normalize and validate this expression as a ``union`` definition.
:param expr: The expression to validate.
:param info: QAPI schema source file information.
:raise QAPISemError: when ``expr`` is not a valid ``union``.
:return: None, ``expr`` is normalized in-place as needed.
@ -516,6 +513,7 @@ def check_union(expr: _JSONObject, info: QAPISourceInfo) -> None:
base = expr['base']
discriminator = expr['discriminator']
members = expr['data']
info = expr.info
check_type(base, info, "'base'", allow_dict=name)
check_name_is_str(discriminator, info, "'discriminator'")
@ -530,17 +528,17 @@ def check_union(expr: _JSONObject, info: QAPISourceInfo) -> None:
check_type(value['type'], info, source, allow_array=not base)
def check_alternate(expr: _JSONObject, info: QAPISourceInfo) -> None:
def check_alternate(expr: QAPIExpression) -> None:
"""
Normalize and validate this expression as an ``alternate`` definition.
:param expr: The expression to validate.
:param info: QAPI schema source file information.
:raise QAPISemError: When ``expr`` is not a valid ``alternate``.
:return: None, ``expr`` is normalized in-place as needed.
"""
members = expr['data']
info = expr.info
if not members:
raise QAPISemError(info, "'data' must not be empty")
@ -556,12 +554,11 @@ def check_alternate(expr: _JSONObject, info: QAPISourceInfo) -> None:
check_type(value['type'], info, source, allow_array=True)
def check_command(expr: _JSONObject, info: QAPISourceInfo) -> None:
def check_command(expr: QAPIExpression) -> None:
"""
Normalize and validate this expression as a ``command`` definition.
:param expr: The expression to validate.
:param info: QAPI schema source file information.
:raise QAPISemError: When ``expr`` is not a valid ``command``.
:return: None, ``expr`` is normalized in-place as needed.
@ -571,17 +568,16 @@ def check_command(expr: _JSONObject, info: QAPISourceInfo) -> None:
boxed = expr.get('boxed', False)
if boxed and args is None:
raise QAPISemError(info, "'boxed': true requires 'data'")
check_type(args, info, "'data'", allow_dict=not boxed)
check_type(rets, info, "'returns'", allow_array=True)
raise QAPISemError(expr.info, "'boxed': true requires 'data'")
check_type(args, expr.info, "'data'", allow_dict=not boxed)
check_type(rets, expr.info, "'returns'", allow_array=True)
def check_event(expr: _JSONObject, info: QAPISourceInfo) -> None:
def check_event(expr: QAPIExpression) -> None:
"""
Normalize and validate this expression as an ``event`` definition.
:param expr: The expression to validate.
:param info: QAPI schema source file information.
:raise QAPISemError: When ``expr`` is not a valid ``event``.
:return: None, ``expr`` is normalized in-place as needed.
@ -590,11 +586,11 @@ def check_event(expr: _JSONObject, info: QAPISourceInfo) -> None:
boxed = expr.get('boxed', False)
if boxed and args is None:
raise QAPISemError(info, "'boxed': true requires 'data'")
check_type(args, info, "'data'", allow_dict=not boxed)
raise QAPISemError(expr.info, "'boxed': true requires 'data'")
check_type(args, expr.info, "'data'", allow_dict=not boxed)
def check_exprs(exprs: List[_JSONObject]) -> List[_JSONObject]:
def check_exprs(exprs: List[QAPIExpression]) -> List[QAPIExpression]:
"""
Validate and normalize a list of parsed QAPI schema expressions.
@ -606,21 +602,9 @@ def check_exprs(exprs: List[_JSONObject]) -> List[_JSONObject]:
:raise QAPISemError: When any expression fails validation.
:return: The same list of expressions (now modified).
"""
for expr_elem in exprs:
# Expression
assert isinstance(expr_elem['expr'], dict)
for key in expr_elem['expr'].keys():
assert isinstance(key, str)
expr: _JSONObject = expr_elem['expr']
# QAPISourceInfo
assert isinstance(expr_elem['info'], QAPISourceInfo)
info: QAPISourceInfo = expr_elem['info']
# Optional[QAPIDoc]
tmp = expr_elem.get('doc')
assert tmp is None or isinstance(tmp, QAPIDoc)
doc: Optional[QAPIDoc] = tmp
for expr in exprs:
info = expr.info
doc = expr.doc
if 'include' in expr:
continue
@ -652,24 +636,24 @@ def check_exprs(exprs: List[_JSONObject]) -> List[_JSONObject]:
if meta == 'enum':
check_keys(expr, info, meta,
['enum', 'data'], ['if', 'features', 'prefix'])
check_enum(expr, info)
check_enum(expr)
elif meta == 'union':
check_keys(expr, info, meta,
['union', 'base', 'discriminator', 'data'],
['if', 'features'])
normalize_members(expr.get('base'))
normalize_members(expr['data'])
check_union(expr, info)
check_union(expr)
elif meta == 'alternate':
check_keys(expr, info, meta,
['alternate', 'data'], ['if', 'features'])
normalize_members(expr['data'])
check_alternate(expr, info)
check_alternate(expr)
elif meta == 'struct':
check_keys(expr, info, meta,
['struct', 'data'], ['base', 'if', 'features'])
normalize_members(expr['data'])
check_struct(expr, info)
check_struct(expr)
elif meta == 'command':
check_keys(expr, info, meta,
['command'],
@ -677,17 +661,17 @@ def check_exprs(exprs: List[_JSONObject]) -> List[_JSONObject]:
'gen', 'success-response', 'allow-oob',
'allow-preconfig', 'coroutine'])
normalize_members(expr.get('data'))
check_command(expr, info)
check_command(expr)
elif meta == 'event':
check_keys(expr, info, meta,
['event'], ['data', 'boxed', 'if', 'features'])
normalize_members(expr.get('data'))
check_event(expr, info)
check_event(expr)
else:
assert False, 'unexpected meta type'
check_if(expr, info, meta)
check_features(expr.get('features'), info)
check_flags(expr, info)
check_flags(expr)
return exprs

46
scripts/qapi/parser.py
View file

@ -21,6 +21,7 @@
TYPE_CHECKING,
Dict,
List,
Mapping,
Optional,
Set,
Union,
@ -37,15 +38,24 @@
from .schema import QAPISchemaFeature, QAPISchemaMember
#: Represents a single Top Level QAPI schema expression.
TopLevelExpr = Dict[str, object]
# Return value alias for get_expr().
_ExprValue = Union[List[object], Dict[str, object], str, bool]
# FIXME: Consolidate and centralize definitions for TopLevelExpr,
# _ExprValue, _JSONValue, and _JSONObject; currently scattered across
# several modules.
# FIXME: Consolidate and centralize definitions for _ExprValue,
# JSONValue, and _JSONObject; currently scattered across several
# modules.
class QAPIExpression(Dict[str, object]):
# pylint: disable=too-few-public-methods
def __init__(self,
data: Mapping[str, object],
info: QAPISourceInfo,
doc: Optional['QAPIDoc'] = None):
super().__init__(data)
self.info = info
self.doc: Optional['QAPIDoc'] = doc
class QAPIParseError(QAPISourceError):
@ -100,7 +110,7 @@ def __init__(self,
self.line_pos = 0
# Parser output:
self.exprs: List[Dict[str, object]] = []
self.exprs: List[QAPIExpression] = []
self.docs: List[QAPIDoc] = []
# Showtime!
@ -147,8 +157,7 @@ def _parse(self) -> None:
"value of 'include' must be a string")
incl_fname = os.path.join(os.path.dirname(self._fname),
include)
self.exprs.append({'expr': {'include': incl_fname},
'info': info})
self._add_expr(OrderedDict({'include': incl_fname}), info)
exprs_include = self._include(include, info, incl_fname,
self._included)
if exprs_include:
@ -165,17 +174,18 @@ def _parse(self) -> None:
for name, value in pragma.items():
self._pragma(name, value, info)
else:
expr_elem = {'expr': expr,
'info': info}
if cur_doc:
if not cur_doc.symbol:
raise QAPISemError(
cur_doc.info, "definition documentation required")
expr_elem['doc'] = cur_doc
self.exprs.append(expr_elem)
if cur_doc and not cur_doc.symbol:
raise QAPISemError(
cur_doc.info, "definition documentation required")
self._add_expr(expr, info, cur_doc)
cur_doc = None
self.reject_expr_doc(cur_doc)
def _add_expr(self, expr: Mapping[str, object],
info: QAPISourceInfo,
doc: Optional['QAPIDoc'] = None) -> None:
self.exprs.append(QAPIExpression(expr, info, doc))
@staticmethod
def reject_expr_doc(doc: Optional['QAPIDoc']) -> None:
if doc and doc.symbol:
@ -784,7 +794,7 @@ def connect_feature(self, feature: 'QAPISchemaFeature') -> None:
% feature.name)
self.features[feature.name].connect(feature)
def check_expr(self, expr: TopLevelExpr) -> None:
def check_expr(self, expr: QAPIExpression) -> None:
if self.has_section('Returns') and 'command' not in expr:
raise QAPISemError(self.info,
"'Returns:' is only valid for commands")

72
scripts/qapi/schema.py
View file

@ -17,7 +17,7 @@
from collections import OrderedDict
import os
import re
from typing import Optional
from typing import List, Optional
from .common import (
POINTER_SUFFIX,
@ -29,7 +29,7 @@
)
from .error import QAPIError, QAPISemError, QAPISourceError
from .expr import check_exprs
from .parser import QAPISchemaParser
from .parser import QAPIExpression, QAPISchemaParser
class QAPISchemaIfCond:
@ -964,10 +964,11 @@ def module_by_fname(self, fname):
name = self._module_name(fname)
return self._module_dict[name]
def _def_include(self, expr, info, doc):
def _def_include(self, expr: QAPIExpression):
include = expr['include']
assert doc is None
self._def_entity(QAPISchemaInclude(self._make_module(include), info))
assert expr.doc is None
self._def_entity(
QAPISchemaInclude(self._make_module(include), expr.info))
def _def_builtin_type(self, name, json_type, c_type):
self._def_entity(QAPISchemaBuiltinType(name, json_type, c_type))
@ -1045,14 +1046,15 @@ def _make_implicit_object_type(self, name, info, ifcond, role, members):
name, info, None, ifcond, None, None, members, None))
return name
def _def_enum_type(self, expr, info, doc):
def _def_enum_type(self, expr: QAPIExpression):
name = expr['enum']
data = expr['data']
prefix = expr.get('prefix')
ifcond = QAPISchemaIfCond(expr.get('if'))
info = expr.info
features = self._make_features(expr.get('features'), info)
self._def_entity(QAPISchemaEnumType(
name, info, doc, ifcond, features,
name, info, expr.doc, ifcond, features,
self._make_enum_members(data, info), prefix))
def _make_member(self, name, typ, ifcond, features, info):
@ -1072,14 +1074,15 @@ def _make_members(self, data, info):
value.get('features'), info)
for (key, value) in data.items()]
def _def_struct_type(self, expr, info, doc):
def _def_struct_type(self, expr: QAPIExpression):
name = expr['struct']
base = expr.get('base')
data = expr['data']
info = expr.info
ifcond = QAPISchemaIfCond(expr.get('if'))
features = self._make_features(expr.get('features'), info)
self._def_entity(QAPISchemaObjectType(
name, info, doc, ifcond, features, base,
name, info, expr.doc, ifcond, features, base,
self._make_members(data, info),
None))
@ -1089,11 +1092,13 @@ def _make_variant(self, case, typ, ifcond, info):
typ = self._make_array_type(typ[0], info)
return QAPISchemaVariant(case, info, typ, ifcond)
def _def_union_type(self, expr, info, doc):
def _def_union_type(self, expr: QAPIExpression):
name = expr['union']
base = expr['base']
tag_name = expr['discriminator']
data = expr['data']
assert isinstance(data, dict)
info = expr.info
ifcond = QAPISchemaIfCond(expr.get('if'))
features = self._make_features(expr.get('features'), info)
if isinstance(base, dict):
@ -1105,17 +1110,19 @@ def _def_union_type(self, expr, info, doc):
QAPISchemaIfCond(value.get('if')),
info)
for (key, value) in data.items()]
members = []
members: List[QAPISchemaObjectTypeMember] = []
self._def_entity(
QAPISchemaObjectType(name, info, doc, ifcond, features,
QAPISchemaObjectType(name, info, expr.doc, ifcond, features,
base, members,
QAPISchemaVariants(
tag_name, info, None, variants)))
def _def_alternate_type(self, expr, info, doc):
def _def_alternate_type(self, expr: QAPIExpression):
name = expr['alternate']
data = expr['data']
assert isinstance(data, dict)
ifcond = QAPISchemaIfCond(expr.get('if'))
info = expr.info
features = self._make_features(expr.get('features'), info)
variants = [
self._make_variant(key, value['type'],
@ -1124,11 +1131,11 @@ def _def_alternate_type(self, expr, info, doc):
for (key, value) in data.items()]
tag_member = QAPISchemaObjectTypeMember('type', info, 'QType', False)
self._def_entity(
QAPISchemaAlternateType(name, info, doc, ifcond, features,
QAPISchemaVariants(
None, info, tag_member, variants)))
QAPISchemaAlternateType(
name, info, expr.doc, ifcond, features,
QAPISchemaVariants(None, info, tag_member, variants)))
def _def_command(self, expr, info, doc):
def _def_command(self, expr: QAPIExpression):
name = expr['command']
data = expr.get('data')
rets = expr.get('returns')
@ -1139,6 +1146,7 @@ def _def_command(self, expr, info, doc):
allow_preconfig = expr.get('allow-preconfig', False)
coroutine = expr.get('coroutine', False)
ifcond = QAPISchemaIfCond(expr.get('if'))
info = expr.info
features = self._make_features(expr.get('features'), info)
if isinstance(data, OrderedDict):
data = self._make_implicit_object_type(
@ -1147,44 +1155,42 @@ def _def_command(self, expr, info, doc):
if isinstance(rets, list):
assert len(rets) == 1
rets = self._make_array_type(rets[0], info)
self._def_entity(QAPISchemaCommand(name, info, doc, ifcond, features,
data, rets,
self._def_entity(QAPISchemaCommand(name, info, expr.doc, ifcond,
features, data, rets,
gen, success_response,
boxed, allow_oob, allow_preconfig,
coroutine))
def _def_event(self, expr, info, doc):
def _def_event(self, expr: QAPIExpression):
name = expr['event']
data = expr.get('data')
boxed = expr.get('boxed', False)
ifcond = QAPISchemaIfCond(expr.get('if'))
info = expr.info
features = self._make_features(expr.get('features'), info)
if isinstance(data, OrderedDict):
data = self._make_implicit_object_type(
name, info, ifcond,
'arg', self._make_members(data, info))
self._def_entity(QAPISchemaEvent(name, info, doc, ifcond, features,
data, boxed))
self._def_entity(QAPISchemaEvent(name, info, expr.doc, ifcond,
features, data, boxed))
def _def_exprs(self, exprs):
for expr_elem in exprs:
expr = expr_elem['expr']
info = expr_elem['info']
doc = expr_elem.get('doc')
for expr in exprs:
if 'enum' in expr:
self._def_enum_type(expr, info, doc)
self._def_enum_type(expr)
elif 'struct' in expr:
self._def_struct_type(expr, info, doc)
self._def_struct_type(expr)
elif 'union' in expr:
self._def_union_type(expr, info, doc)
self._def_union_type(expr)
elif 'alternate' in expr:
self._def_alternate_type(expr, info, doc)
self._def_alternate_type(expr)
elif 'command' in expr:
self._def_command(expr, info, doc)
self._def_command(expr)
elif 'event' in expr:
self._def_event(expr, info, doc)
self._def_event(expr)
elif 'include' in expr:
self._def_include(expr, info, doc)
self._def_include(expr)
else:
assert False