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Mon, 26 Oct 2020 21:36:49 +0000 (UTC) Received: from scv.redhat.com (ovpn-118-238.rdu2.redhat.com [10.10.118.238]) by smtp.corp.redhat.com (Postfix) with ESMTP id 0FDC919728; Mon, 26 Oct 2020 21:36:48 +0000 (UTC) From: John Snow To: qemu-devel@nongnu.org, Markus Armbruster Subject: [PATCH v2 12/16] qapi/expr.py: Add docstrings Date: Mon, 26 Oct 2020 17:36:33 -0400 Message-Id: <20201026213637.47087-13-jsnow@redhat.com> In-Reply-To: <20201026213637.47087-1-jsnow@redhat.com> References: <20201026213637.47087-1-jsnow@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=jsnow@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=216.205.24.124; envelope-from=jsnow@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/10/26 02:39:09 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_FILL_THIS_FORM_SHORT=0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: John Snow , Eduardo Habkost , Cleber Rosa Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Signed-off-by: John Snow Reviewed-by: Cleber Rosa --- scripts/qapi/expr.py | 167 ++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 164 insertions(+), 3 deletions(-) diff --git a/scripts/qapi/expr.py b/scripts/qapi/expr.py index 99c5c2ff99b0..8ad82ca98864 100644 --- a/scripts/qapi/expr.py +++ b/scripts/qapi/expr.py @@ -1,7 +1,5 @@ # -*- coding: utf-8 -*- # -# Check (context-free) QAPI schema expression structure -# # Copyright IBM, Corp. 2011 # Copyright (c) 2013-2019 Red Hat Inc. # @@ -14,6 +12,25 @@ # This work is licensed under the terms of the GNU GPL, version 2. # See the COPYING file in the top-level directory. +""" +Normalize and validate (context-free) QAPI schema expression structures. + +After QAPI expressions are parsed from disk, they are stored in +recursively nested Python data structures using Dict, List, str, bool, +and int. This module ensures that those nested structures have the +correct type(s) and key(s) where appropriate for the QAPI context-free +grammar. + +The QAPI schema expression language allows for syntactic sugar; this +module also handles the normalization process of these nested +structures. + +See `check_exprs` for the main entry point. + +See `schema.QAPISchema` for processing into native Python data +structures and contextual semantic validation. +""" + import re from typing import ( Iterable, @@ -32,7 +49,7 @@ # Arbitrary form for a JSON-like object. _JSObject = MutableMapping[str, object] -# Expressions in their raw form are (just) JSON-like objects. +#: Expressions in their unvalidated form are JSON-like objects. Expression = _JSObject @@ -46,6 +63,7 @@ def check_name_is_str(name: object, info: QAPISourceInfo, source: str) -> None: + """Ensures that ``name`` is a string. [Const]""" if not isinstance(name, str): raise QAPISemError(info, "%s requires a string name" % source) @@ -56,6 +74,25 @@ def check_name_str(name: str, allow_optional: bool = False, enum_member: bool = False, permit_upper: bool = False) -> None: + """ + Ensures a string is a legal name. [Const] + + A name is legal in the default case when: + + - It matches ``(__[a-z0-9.-]+_)?[a-z][a-z0-9_-]*`` + - It does not start with ``q_`` or ``q-`` + + :param name: Name to check. + :param info: QAPI source file information. + :param source: Human-readable str describing "what" this name is. + :param allow_optional: Allow the very first character to be ``*``. + (Cannot be used with ``enum_member``) + :param enum_member: Allow the very first character to be a digit. + (Cannot be used with ``allow_optional``) + :param permit_upper: Allows upper-case characters wherever + lower-case characters are allowed. + """ + assert not (allow_optional and enum_member) membername = name if allow_optional and name.startswith('*'): @@ -76,6 +113,17 @@ def check_name_str(name: str, def check_defn_name_str(name: str, info: QAPISourceInfo, meta: str) -> None: + """ + Ensures a name is a legal definition name. [Const] + + A legal definition name: + - Adheres to the criteria in `check_name_str`, with uppercase permitted + - Does not end with ``Kind`` or ``List``. + + :param name: Name to check. + :param info: QAPI source file information. + :param meta: Type name of the QAPI expression. + """ check_name_str(name, info, meta, permit_upper=True) if name.endswith('Kind') or name.endswith('List'): raise QAPISemError( @@ -87,6 +135,15 @@ def check_keys(value: _JSObject, source: str, required: List[str], optional: List[str]) -> None: + """ + Ensures an object has a specific set of keys. [Const] + + :param value: The object to check. + :param info: QAPI source file information. + :param source: Human-readable str describing "what" this object is. + :param required: Keys that *must* be present. + :param optional: Keys that *may* be present. + """ def pprint(elems: Iterable[str]) -> str: return ', '.join("'" + e + "'" for e in sorted(elems)) @@ -109,6 +166,12 @@ def pprint(elems: Iterable[str]) -> str: def check_flags(expr: Expression, info: QAPISourceInfo) -> None: + """ + Ensures common fields in an Expression are correct. [Const] + + :param expr: Expression to validate. + :param info: QAPI source file information. + """ for key in ['gen', 'success-response']: if key in expr and expr[key] is not False: raise QAPISemError( @@ -127,6 +190,19 @@ def check_flags(expr: Expression, info: QAPISourceInfo) -> None: def check_if(expr: _JSObject, info: QAPISourceInfo, source: str) -> None: + """ + Syntactically validate and normalize the ``if`` field of an object. [RW] + + The ``if`` field may be either a ``str`` or a ``List[str]``. + A ``str`` element will be normalized to ``List[str]``. + + :param expr: A ``dict``; the ``if`` field, if present, will be validated. + :param info: QAPI source file information. + + :forms: + :sugared: ``Union[str, List[str]]`` + :canonical: ``List[str]`` + """ def check_if_str(ifcond: object) -> None: if not isinstance(ifcond, str): @@ -155,6 +231,17 @@ def check_if_str(ifcond: object) -> None: def normalize_members(members: object) -> None: + """ + Normalize a "members" value. [RW] + + If ``members`` is an object, for every value in that object, if that + value is not itself already an object, normalize it to + ``{'type': value}``. + + :forms: + :sugared: ``Dict[str, Union[str, TypeRef]]`` + :canonical: ``Dict[str, TypeRef]`` + """ if isinstance(members, dict): for key, arg in members.items(): if isinstance(arg, dict): @@ -167,6 +254,21 @@ def check_type(value: Optional[object], source: str, allow_array: bool = False, allow_dict: Union[bool, str] = False) -> None: + """ + Check the QAPI type of ``value``. [RW] + + Python types of ``str`` or ``None`` are always allowed. + + :param value: The value to check. + :param info: QAPI Source file information. + :param source: Human readable string describing "what" the value is. + :param allow_array: Allow a ``List[str]`` of length 1, + which indicates an Array type. + :param allow_dict: Allow a dict, treated as an anonymous type. + When given a string, check if that name is allowed to + have keys that use uppercase letters, and modify + validation accordingly. + """ if value is None: return @@ -212,6 +314,16 @@ def check_type(value: Optional[object], def check_features(features: Optional[object], info: QAPISourceInfo) -> None: + """ + Syntactically validate and normalize the ``features`` field. [RW] + + ``features`` may be a ``list`` of either ``str`` or ``dict``. + Any ``str`` element will be normalized to ``{'name': element}``. + + :forms: + :sugared: ``List[Union[str, Feature]]`` + :canonical: ``List[Feature]`` + """ if features is None: return if not isinstance(features, list): @@ -229,6 +341,12 @@ def check_features(features: Optional[object], def check_enum(expr: Expression, info: QAPISourceInfo) -> None: + """ + Validate this `Expression` as an ``enum`` expression. [RW] + + :param expr: `Expression` to validate. + :param info: QAPI source file information. + """ name = expr['enum'] members = expr['data'] prefix = expr.get('prefix') @@ -253,6 +371,12 @@ def check_enum(expr: Expression, info: QAPISourceInfo) -> None: def check_struct(expr: Expression, info: QAPISourceInfo) -> None: + """ + Validate this `Expression` as a ``struct`` expression. [RW] + + :param expr: `Expression` to validate. + :param info: QAPI source file information. + """ name = cast(str, expr['struct']) # Asserted in check_exprs members = expr['data'] @@ -261,6 +385,12 @@ def check_struct(expr: Expression, info: QAPISourceInfo) -> None: def check_union(expr: Expression, info: QAPISourceInfo) -> None: + """ + Validate this `Expression` as a ``union`` expression. [RW] + + :param expr: `Expression` to validate. + :param info: QAPI source file information. + """ name = cast(str, expr['union']) # Asserted in check_exprs base = expr.get('base') discriminator = expr.get('discriminator') @@ -287,6 +417,12 @@ def check_union(expr: Expression, info: QAPISourceInfo) -> None: def check_alternate(expr: Expression, info: QAPISourceInfo) -> None: + """ + Validate this `Expression` as an ``alternate`` expression. [RW] + + :param expr: Expression to validate. + :param info: QAPI source file information. + """ members = expr['data'] if not members: @@ -304,6 +440,12 @@ def check_alternate(expr: Expression, info: QAPISourceInfo) -> None: def check_command(expr: Expression, info: QAPISourceInfo) -> None: + """ + Validate this `Expression` as a ``command`` expression. [RW] + + :param expr: `Expression` to validate. + :param info: QAPI source file information. + """ args = expr.get('data') rets = expr.get('returns') boxed = expr.get('boxed', False) @@ -315,6 +457,16 @@ def check_command(expr: Expression, info: QAPISourceInfo) -> None: def check_event(expr: Expression, info: QAPISourceInfo) -> None: + """ + Normalize and syntactically validate the ``event`` expression. [RW] + + :Event: + :event: ``str`` + :data: ``Optional[Dict[str, Member]]`` + :boxed: ``Optional[bool]`` + :if: ``Optional[Ifcond]`` (see: `check_if`) + :features: ``Optional[Features]`` (see: `check_features`) + """ args = expr.get('data') boxed = expr.get('boxed', False) @@ -324,6 +476,15 @@ def check_event(expr: Expression, info: QAPISourceInfo) -> None: def check_exprs(exprs: List[_JSObject]) -> List[_JSObject]: + """ + Validate and normalize a list of parsed QAPI schema expressions. [RW] + + This function accepts a list of expressions + metadta as returned by + the parser. It destructively normalizes the expressions in-place. + + :param exprs: The list of expressions to normalize/validate. + :return: The same list of expressions (now modified). + """ for expr_elem in exprs: # Expression assert isinstance(expr_elem['expr'], dict)