420110591c
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]
821 lines
30 KiB
Python
821 lines
30 KiB
Python
# -*- coding: utf-8 -*-
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#
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# QAPI schema parser
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#
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# Copyright IBM, Corp. 2011
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# Copyright (c) 2013-2019 Red Hat Inc.
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#
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# Authors:
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# Anthony Liguori <aliguori@us.ibm.com>
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# Markus Armbruster <armbru@redhat.com>
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# Marc-André Lureau <marcandre.lureau@redhat.com>
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# Kevin Wolf <kwolf@redhat.com>
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#
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# This work is licensed under the terms of the GNU GPL, version 2.
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# See the COPYING file in the top-level directory.
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from collections import OrderedDict
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import os
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import re
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from typing import (
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TYPE_CHECKING,
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Dict,
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List,
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Mapping,
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Optional,
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Set,
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Union,
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)
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from .common import must_match
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from .error import QAPISemError, QAPISourceError
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from .source import QAPISourceInfo
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if TYPE_CHECKING:
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# pylint: disable=cyclic-import
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# TODO: Remove cycle. [schema -> expr -> parser -> schema]
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from .schema import QAPISchemaFeature, QAPISchemaMember
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# Return value alias for get_expr().
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_ExprValue = Union[List[object], Dict[str, object], str, bool]
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# FIXME: Consolidate and centralize definitions for _ExprValue,
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# JSONValue, and _JSONObject; currently scattered across several
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# modules.
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class QAPIExpression(Dict[str, object]):
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# pylint: disable=too-few-public-methods
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def __init__(self,
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data: Mapping[str, object],
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info: QAPISourceInfo,
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doc: Optional['QAPIDoc'] = None):
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super().__init__(data)
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self.info = info
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self.doc: Optional['QAPIDoc'] = doc
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class QAPIParseError(QAPISourceError):
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"""Error class for all QAPI schema parsing errors."""
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def __init__(self, parser: 'QAPISchemaParser', msg: str):
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col = 1
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for ch in parser.src[parser.line_pos:parser.pos]:
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if ch == '\t':
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col = (col + 7) % 8 + 1
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else:
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col += 1
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super().__init__(parser.info, msg, col)
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class QAPISchemaParser:
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"""
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Parse QAPI schema source.
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Parse a JSON-esque schema file and process directives. See
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qapi-code-gen.txt section "Schema Syntax" for the exact syntax.
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Grammatical validation is handled later by `expr.check_exprs()`.
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:param fname: Source file name.
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:param previously_included:
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The absolute names of previously included source files,
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if being invoked from another parser.
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:param incl_info:
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`QAPISourceInfo` belonging to the parent module.
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``None`` implies this is the root module.
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:ivar exprs: Resulting parsed expressions.
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:ivar docs: Resulting parsed documentation blocks.
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:raise OSError: For problems reading the root schema document.
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:raise QAPIError: For errors in the schema source.
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"""
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def __init__(self,
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fname: str,
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previously_included: Optional[Set[str]] = None,
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incl_info: Optional[QAPISourceInfo] = None):
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self._fname = fname
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self._included = previously_included or set()
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self._included.add(os.path.abspath(self._fname))
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self.src = ''
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# Lexer state (see `accept` for details):
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self.info = QAPISourceInfo(self._fname, incl_info)
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self.tok: Union[None, str] = None
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self.pos = 0
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self.cursor = 0
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self.val: Optional[Union[bool, str]] = None
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self.line_pos = 0
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# Parser output:
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self.exprs: List[QAPIExpression] = []
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self.docs: List[QAPIDoc] = []
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# Showtime!
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self._parse()
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def _parse(self) -> None:
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"""
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Parse the QAPI schema document.
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:return: None. Results are stored in ``.exprs`` and ``.docs``.
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"""
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cur_doc = None
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# May raise OSError; allow the caller to handle it.
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with open(self._fname, 'r', encoding='utf-8') as fp:
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self.src = fp.read()
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if self.src == '' or self.src[-1] != '\n':
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self.src += '\n'
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# Prime the lexer:
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self.accept()
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# Parse until done:
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while self.tok is not None:
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info = self.info
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if self.tok == '#':
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self.reject_expr_doc(cur_doc)
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for cur_doc in self.get_doc(info):
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self.docs.append(cur_doc)
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continue
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expr = self.get_expr()
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if not isinstance(expr, dict):
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raise QAPISemError(
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info, "top-level expression must be an object")
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if 'include' in expr:
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self.reject_expr_doc(cur_doc)
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if len(expr) != 1:
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raise QAPISemError(info, "invalid 'include' directive")
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include = expr['include']
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if not isinstance(include, str):
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raise QAPISemError(info,
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"value of 'include' must be a string")
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incl_fname = os.path.join(os.path.dirname(self._fname),
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include)
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self._add_expr(OrderedDict({'include': incl_fname}), info)
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exprs_include = self._include(include, info, incl_fname,
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self._included)
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if exprs_include:
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self.exprs.extend(exprs_include.exprs)
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self.docs.extend(exprs_include.docs)
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elif "pragma" in expr:
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self.reject_expr_doc(cur_doc)
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if len(expr) != 1:
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raise QAPISemError(info, "invalid 'pragma' directive")
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pragma = expr['pragma']
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if not isinstance(pragma, dict):
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raise QAPISemError(
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info, "value of 'pragma' must be an object")
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for name, value in pragma.items():
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self._pragma(name, value, info)
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else:
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if cur_doc and not cur_doc.symbol:
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raise QAPISemError(
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cur_doc.info, "definition documentation required")
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self._add_expr(expr, info, cur_doc)
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cur_doc = None
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self.reject_expr_doc(cur_doc)
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def _add_expr(self, expr: Mapping[str, object],
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info: QAPISourceInfo,
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doc: Optional['QAPIDoc'] = None) -> None:
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self.exprs.append(QAPIExpression(expr, info, doc))
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@staticmethod
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def reject_expr_doc(doc: Optional['QAPIDoc']) -> None:
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if doc and doc.symbol:
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raise QAPISemError(
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doc.info,
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"documentation for '%s' is not followed by the definition"
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% doc.symbol)
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@staticmethod
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def _include(include: str,
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info: QAPISourceInfo,
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incl_fname: str,
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previously_included: Set[str]
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) -> Optional['QAPISchemaParser']:
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incl_abs_fname = os.path.abspath(incl_fname)
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# catch inclusion cycle
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inf: Optional[QAPISourceInfo] = info
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while inf:
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if incl_abs_fname == os.path.abspath(inf.fname):
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raise QAPISemError(info, "inclusion loop for %s" % include)
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inf = inf.parent
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# skip multiple include of the same file
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if incl_abs_fname in previously_included:
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return None
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try:
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return QAPISchemaParser(incl_fname, previously_included, info)
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except OSError as err:
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raise QAPISemError(
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info,
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f"can't read include file '{incl_fname}': {err.strerror}"
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) from err
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@staticmethod
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def _pragma(name: str, value: object, info: QAPISourceInfo) -> None:
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def check_list_str(name: str, value: object) -> List[str]:
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if (not isinstance(value, list) or
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any(not isinstance(elt, str) for elt in value)):
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raise QAPISemError(
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info,
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"pragma %s must be a list of strings" % name)
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return value
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pragma = info.pragma
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if name == 'doc-required':
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if not isinstance(value, bool):
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raise QAPISemError(info,
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"pragma 'doc-required' must be boolean")
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pragma.doc_required = value
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elif name == 'command-name-exceptions':
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pragma.command_name_exceptions = check_list_str(name, value)
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elif name == 'command-returns-exceptions':
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pragma.command_returns_exceptions = check_list_str(name, value)
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elif name == 'member-name-exceptions':
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pragma.member_name_exceptions = check_list_str(name, value)
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else:
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raise QAPISemError(info, "unknown pragma '%s'" % name)
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def accept(self, skip_comment: bool = True) -> None:
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"""
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Read and store the next token.
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:param skip_comment:
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When false, return COMMENT tokens ("#").
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This is used when reading documentation blocks.
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:return:
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None. Several instance attributes are updated instead:
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- ``.tok`` represents the token type. See below for values.
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- ``.info`` describes the token's source location.
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- ``.val`` is the token's value, if any. See below.
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- ``.pos`` is the buffer index of the first character of
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the token.
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* Single-character tokens:
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These are "{", "}", ":", ",", "[", and "]".
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``.tok`` holds the single character and ``.val`` is None.
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* Multi-character tokens:
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* COMMENT:
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This token is not normally returned by the lexer, but it can
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be when ``skip_comment`` is False. ``.tok`` is "#", and
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``.val`` is a string including all chars until end-of-line,
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including the "#" itself.
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* STRING:
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``.tok`` is "'", the single quote. ``.val`` contains the
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string, excluding the surrounding quotes.
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* TRUE and FALSE:
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``.tok`` is either "t" or "f", ``.val`` will be the
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corresponding bool value.
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* EOF:
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``.tok`` and ``.val`` will both be None at EOF.
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"""
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while True:
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self.tok = self.src[self.cursor]
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self.pos = self.cursor
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self.cursor += 1
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self.val = None
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if self.tok == '#':
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if self.src[self.cursor] == '#':
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# Start of doc comment
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skip_comment = False
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self.cursor = self.src.find('\n', self.cursor)
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if not skip_comment:
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self.val = self.src[self.pos:self.cursor]
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return
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elif self.tok in '{}:,[]':
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return
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elif self.tok == "'":
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# Note: we accept only printable ASCII
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string = ''
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esc = False
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while True:
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ch = self.src[self.cursor]
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self.cursor += 1
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if ch == '\n':
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raise QAPIParseError(self, "missing terminating \"'\"")
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if esc:
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# Note: we recognize only \\ because we have
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# no use for funny characters in strings
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if ch != '\\':
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raise QAPIParseError(self,
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"unknown escape \\%s" % ch)
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esc = False
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elif ch == '\\':
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esc = True
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continue
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elif ch == "'":
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self.val = string
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return
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if ord(ch) < 32 or ord(ch) >= 127:
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raise QAPIParseError(
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self, "funny character in string")
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string += ch
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elif self.src.startswith('true', self.pos):
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self.val = True
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self.cursor += 3
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return
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elif self.src.startswith('false', self.pos):
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self.val = False
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self.cursor += 4
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return
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elif self.tok == '\n':
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if self.cursor == len(self.src):
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self.tok = None
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return
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self.info = self.info.next_line()
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self.line_pos = self.cursor
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elif not self.tok.isspace():
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# Show up to next structural, whitespace or quote
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# character
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match = must_match('[^[\\]{}:,\\s\'"]+',
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self.src[self.cursor-1:])
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raise QAPIParseError(self, "stray '%s'" % match.group(0))
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def get_members(self) -> Dict[str, object]:
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expr: Dict[str, object] = OrderedDict()
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if self.tok == '}':
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self.accept()
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return expr
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if self.tok != "'":
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raise QAPIParseError(self, "expected string or '}'")
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while True:
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key = self.val
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assert isinstance(key, str) # Guaranteed by tok == "'"
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self.accept()
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if self.tok != ':':
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raise QAPIParseError(self, "expected ':'")
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self.accept()
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if key in expr:
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raise QAPIParseError(self, "duplicate key '%s'" % key)
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expr[key] = self.get_expr()
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if self.tok == '}':
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self.accept()
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return expr
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if self.tok != ',':
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raise QAPIParseError(self, "expected ',' or '}'")
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self.accept()
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if self.tok != "'":
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raise QAPIParseError(self, "expected string")
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def get_values(self) -> List[object]:
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expr: List[object] = []
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if self.tok == ']':
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self.accept()
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return expr
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if self.tok not in tuple("{['tf"):
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raise QAPIParseError(
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self, "expected '{', '[', ']', string, or boolean")
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while True:
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expr.append(self.get_expr())
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if self.tok == ']':
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self.accept()
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return expr
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if self.tok != ',':
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raise QAPIParseError(self, "expected ',' or ']'")
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self.accept()
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def get_expr(self) -> _ExprValue:
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expr: _ExprValue
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if self.tok == '{':
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self.accept()
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expr = self.get_members()
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elif self.tok == '[':
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self.accept()
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expr = self.get_values()
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elif self.tok in tuple("'tf"):
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assert isinstance(self.val, (str, bool))
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expr = self.val
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self.accept()
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else:
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raise QAPIParseError(
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self, "expected '{', '[', string, or boolean")
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return expr
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def get_doc(self, info: QAPISourceInfo) -> List['QAPIDoc']:
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if self.val != '##':
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raise QAPIParseError(
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self, "junk after '##' at start of documentation comment")
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docs = []
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cur_doc = QAPIDoc(self, info)
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self.accept(False)
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while self.tok == '#':
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assert isinstance(self.val, str)
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if self.val.startswith('##'):
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# End of doc comment
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if self.val != '##':
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raise QAPIParseError(
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self,
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"junk after '##' at end of documentation comment")
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cur_doc.end_comment()
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docs.append(cur_doc)
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self.accept()
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return docs
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if self.val.startswith('# ='):
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if cur_doc.symbol:
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raise QAPIParseError(
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self,
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"unexpected '=' markup in definition documentation")
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if cur_doc.body.text:
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cur_doc.end_comment()
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docs.append(cur_doc)
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cur_doc = QAPIDoc(self, info)
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cur_doc.append(self.val)
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self.accept(False)
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raise QAPIParseError(self, "documentation comment must end with '##'")
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|
|
|
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class QAPIDoc:
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"""
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A documentation comment block, either definition or free-form
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Definition documentation blocks consist of
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* a body section: one line naming the definition, followed by an
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overview (any number of lines)
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* argument sections: a description of each argument (for commands
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and events) or member (for structs, unions and alternates)
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* features sections: a description of each feature flag
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* additional (non-argument) sections, possibly tagged
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Free-form documentation blocks consist only of a body section.
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"""
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|
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class Section:
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# pylint: disable=too-few-public-methods
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def __init__(self, parser: QAPISchemaParser,
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name: Optional[str] = None, indent: int = 0):
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# parser, for error messages about indentation
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self._parser = parser
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# optional section name (argument/member or section name)
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self.name = name
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self.text = ''
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# the expected indent level of the text of this section
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self._indent = indent
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def append(self, line: str) -> None:
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# Strip leading spaces corresponding to the expected indent level
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|
# Blank lines are always OK.
|
|
if line:
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indent = must_match(r'\s*', line).end()
|
|
if indent < self._indent:
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raise QAPIParseError(
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self._parser,
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"unexpected de-indent (expected at least %d spaces)" %
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self._indent)
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line = line[self._indent:]
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self.text += line.rstrip() + '\n'
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|
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class ArgSection(Section):
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def __init__(self, parser: QAPISchemaParser,
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name: str, indent: int = 0):
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super().__init__(parser, name, indent)
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self.member: Optional['QAPISchemaMember'] = None
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|
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def connect(self, member: 'QAPISchemaMember') -> None:
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self.member = member
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|
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class NullSection(Section):
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"""
|
|
Immutable dummy section for use at the end of a doc block.
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|
"""
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# pylint: disable=too-few-public-methods
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def append(self, line: str) -> None:
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assert False, "Text appended after end_comment() called."
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def __init__(self, parser: QAPISchemaParser, info: QAPISourceInfo):
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# self._parser is used to report errors with QAPIParseError. The
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# resulting error position depends on the state of the parser.
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# It happens to be the beginning of the comment. More or less
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# servicable, but action at a distance.
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self._parser = parser
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self.info = info
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self.symbol: Optional[str] = None
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self.body = QAPIDoc.Section(parser)
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# dicts mapping parameter/feature names to their ArgSection
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self.args: Dict[str, QAPIDoc.ArgSection] = OrderedDict()
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self.features: Dict[str, QAPIDoc.ArgSection] = OrderedDict()
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self.sections: List[QAPIDoc.Section] = []
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# the current section
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self._section = self.body
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self._append_line = self._append_body_line
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def has_section(self, name: str) -> bool:
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"""Return True if we have a section with this name."""
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for i in self.sections:
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if i.name == name:
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return True
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return False
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def append(self, line: str) -> None:
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"""
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Parse a comment line and add it to the documentation.
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The way that the line is dealt with depends on which part of
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the documentation we're parsing right now:
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* The body section: ._append_line is ._append_body_line
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* An argument section: ._append_line is ._append_args_line
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* A features section: ._append_line is ._append_features_line
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* An additional section: ._append_line is ._append_various_line
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"""
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line = line[1:]
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if not line:
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self._append_freeform(line)
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return
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if line[0] != ' ':
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raise QAPIParseError(self._parser, "missing space after #")
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line = line[1:]
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self._append_line(line)
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def end_comment(self) -> None:
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self._switch_section(QAPIDoc.NullSection(self._parser))
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@staticmethod
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def _is_section_tag(name: str) -> bool:
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return name in ('Returns:', 'Since:',
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# those are often singular or plural
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'Note:', 'Notes:',
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'Example:', 'Examples:',
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'TODO:')
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def _append_body_line(self, line: str) -> None:
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"""
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Process a line of documentation text in the body section.
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If this a symbol line and it is the section's first line, this
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is a definition documentation block for that symbol.
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If it's a definition documentation block, another symbol line
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begins the argument section for the argument named by it, and
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a section tag begins an additional section. Start that
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section and append the line to it.
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Else, append the line to the current section.
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"""
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name = line.split(' ', 1)[0]
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# FIXME not nice: things like '# @foo:' and '# @foo: ' aren't
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# recognized, and get silently treated as ordinary text
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if not self.symbol and not self.body.text and line.startswith('@'):
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if not line.endswith(':'):
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raise QAPIParseError(self._parser, "line should end with ':'")
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self.symbol = line[1:-1]
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# Invalid names are not checked here, but the name provided MUST
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# match the following definition, which *is* validated in expr.py.
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if not self.symbol:
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raise QAPIParseError(
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self._parser, "name required after '@'")
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elif self.symbol:
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# This is a definition documentation block
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if name.startswith('@') and name.endswith(':'):
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self._append_line = self._append_args_line
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self._append_args_line(line)
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elif line == 'Features:':
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self._append_line = self._append_features_line
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elif self._is_section_tag(name):
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self._append_line = self._append_various_line
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self._append_various_line(line)
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else:
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self._append_freeform(line)
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else:
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# This is a free-form documentation block
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self._append_freeform(line)
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def _append_args_line(self, line: str) -> None:
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"""
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Process a line of documentation text in an argument section.
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A symbol line begins the next argument section, a section tag
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section or a non-indented line after a blank line begins an
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additional section. Start that section and append the line to
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it.
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Else, append the line to the current section.
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"""
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name = line.split(' ', 1)[0]
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if name.startswith('@') and name.endswith(':'):
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# If line is "@arg: first line of description", find
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# the index of 'f', which is the indent we expect for any
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# following lines. We then remove the leading "@arg:"
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# from line and replace it with spaces so that 'f' has the
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# same index as it did in the original line and can be
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# handled the same way we will handle following lines.
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indent = must_match(r'@\S*:\s*', line).end()
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line = line[indent:]
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if not line:
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# Line was just the "@arg:" header; following lines
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# are not indented
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indent = 0
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else:
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line = ' ' * indent + line
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self._start_args_section(name[1:-1], indent)
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elif self._is_section_tag(name):
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self._append_line = self._append_various_line
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self._append_various_line(line)
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return
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elif (self._section.text.endswith('\n\n')
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and line and not line[0].isspace()):
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if line == 'Features:':
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self._append_line = self._append_features_line
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else:
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self._start_section()
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self._append_line = self._append_various_line
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self._append_various_line(line)
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return
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self._append_freeform(line)
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def _append_features_line(self, line: str) -> None:
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name = line.split(' ', 1)[0]
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if name.startswith('@') and name.endswith(':'):
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# If line is "@arg: first line of description", find
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# the index of 'f', which is the indent we expect for any
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# following lines. We then remove the leading "@arg:"
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# from line and replace it with spaces so that 'f' has the
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# same index as it did in the original line and can be
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# handled the same way we will handle following lines.
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indent = must_match(r'@\S*:\s*', line).end()
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line = line[indent:]
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if not line:
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# Line was just the "@arg:" header; following lines
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# are not indented
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indent = 0
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else:
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line = ' ' * indent + line
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self._start_features_section(name[1:-1], indent)
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elif self._is_section_tag(name):
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self._append_line = self._append_various_line
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self._append_various_line(line)
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return
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elif (self._section.text.endswith('\n\n')
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and line and not line[0].isspace()):
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self._start_section()
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self._append_line = self._append_various_line
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self._append_various_line(line)
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return
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self._append_freeform(line)
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def _append_various_line(self, line: str) -> None:
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"""
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Process a line of documentation text in an additional section.
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A symbol line is an error.
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A section tag begins an additional section. Start that
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section and append the line to it.
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Else, append the line to the current section.
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"""
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name = line.split(' ', 1)[0]
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if name.startswith('@') and name.endswith(':'):
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raise QAPIParseError(self._parser,
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"'%s' can't follow '%s' section"
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% (name, self.sections[0].name))
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if self._is_section_tag(name):
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# If line is "Section: first line of description", find
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# the index of 'f', which is the indent we expect for any
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# following lines. We then remove the leading "Section:"
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# from line and replace it with spaces so that 'f' has the
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# same index as it did in the original line and can be
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# handled the same way we will handle following lines.
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indent = must_match(r'\S*:\s*', line).end()
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line = line[indent:]
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if not line:
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# Line was just the "Section:" header; following lines
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# are not indented
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indent = 0
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else:
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line = ' ' * indent + line
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self._start_section(name[:-1], indent)
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self._append_freeform(line)
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def _start_symbol_section(
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self,
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symbols_dict: Dict[str, 'QAPIDoc.ArgSection'],
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name: str,
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indent: int) -> None:
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# FIXME invalid names other than the empty string aren't flagged
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if not name:
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raise QAPIParseError(self._parser, "invalid parameter name")
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if name in symbols_dict:
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raise QAPIParseError(self._parser,
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"'%s' parameter name duplicated" % name)
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assert not self.sections
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new_section = QAPIDoc.ArgSection(self._parser, name, indent)
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self._switch_section(new_section)
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symbols_dict[name] = new_section
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def _start_args_section(self, name: str, indent: int) -> None:
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self._start_symbol_section(self.args, name, indent)
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def _start_features_section(self, name: str, indent: int) -> None:
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self._start_symbol_section(self.features, name, indent)
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def _start_section(self, name: Optional[str] = None,
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indent: int = 0) -> None:
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if name in ('Returns', 'Since') and self.has_section(name):
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raise QAPIParseError(self._parser,
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"duplicated '%s' section" % name)
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new_section = QAPIDoc.Section(self._parser, name, indent)
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self._switch_section(new_section)
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self.sections.append(new_section)
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def _switch_section(self, new_section: 'QAPIDoc.Section') -> None:
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text = self._section.text = self._section.text.strip()
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# Only the 'body' section is allowed to have an empty body.
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# All other sections, including anonymous ones, must have text.
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if self._section != self.body and not text:
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# We do not create anonymous sections unless there is
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# something to put in them; this is a parser bug.
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assert self._section.name
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raise QAPIParseError(
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self._parser,
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"empty doc section '%s'" % self._section.name)
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self._section = new_section
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def _append_freeform(self, line: str) -> None:
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match = re.match(r'(@\S+:)', line)
|
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if match:
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raise QAPIParseError(self._parser,
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"'%s' not allowed in free-form documentation"
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% match.group(1))
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self._section.append(line)
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def connect_member(self, member: 'QAPISchemaMember') -> None:
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if member.name not in self.args:
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# Undocumented TODO outlaw
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self.args[member.name] = QAPIDoc.ArgSection(self._parser,
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member.name)
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self.args[member.name].connect(member)
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def connect_feature(self, feature: 'QAPISchemaFeature') -> None:
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if feature.name not in self.features:
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raise QAPISemError(feature.info,
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"feature '%s' lacks documentation"
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% feature.name)
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self.features[feature.name].connect(feature)
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def check_expr(self, expr: QAPIExpression) -> None:
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if self.has_section('Returns') and 'command' not in expr:
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raise QAPISemError(self.info,
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"'Returns:' is only valid for commands")
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def check(self) -> None:
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def check_args_section(
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args: Dict[str, QAPIDoc.ArgSection], what: str
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) -> None:
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bogus = [name for name, section in args.items()
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if not section.member]
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if bogus:
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raise QAPISemError(
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self.info,
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"documented %s%s '%s' %s not exist" % (
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what,
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"s" if len(bogus) > 1 else "",
|
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"', '".join(bogus),
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"do" if len(bogus) > 1 else "does"
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))
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check_args_section(self.args, 'member')
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check_args_section(self.features, 'feature')
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