d4092ffa26
Signed-off-by: John Snow <jsnow@redhat.com> Message-Id: <20210519183951.3946870-16-jsnow@redhat.com> Reviewed-by: Markus Armbruster <armbru@redhat.com> [Doc string spacing tweaked slightly] Signed-off-by: Markus Armbruster <armbru@redhat.com>
769 lines
28 KiB
Python
769 lines
28 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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Dict,
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List,
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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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# Return value alias for get_expr().
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_ExprValue = Union[List[object], Dict[str, object], str, bool]
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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[Dict[str, object]] = []
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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.exprs.append({'expr': {'include': incl_fname},
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'info': 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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expr_elem = {'expr': expr,
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'info': info}
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if cur_doc:
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if not cur_doc.symbol:
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raise QAPISemError(
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cur_doc.info, "definition documentation required")
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expr_elem['doc'] = cur_doc
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self.exprs.append(expr_elem)
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cur_doc = None
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self.reject_expr_doc(cur_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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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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class Section:
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def __init__(self, parser, name=None, indent=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):
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# Strip leading spaces corresponding to the expected indent level
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# Blank lines are always OK.
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if line:
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indent = must_match(r'\s*', line).end()
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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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class ArgSection(Section):
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def __init__(self, parser, name, indent=0):
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super().__init__(parser, name, indent)
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self.member = None
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def connect(self, member):
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self.member = member
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def __init__(self, parser, info):
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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 = None
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self.body = QAPIDoc.Section(parser)
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# dict mapping parameter name to ArgSection
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self.args = OrderedDict()
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self.features = OrderedDict()
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# a list of Section
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self.sections = []
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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):
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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):
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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):
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self._end_section()
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@staticmethod
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def _is_section_tag(name):
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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):
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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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# FIXME invalid names other than the empty string aren't flagged
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if not self.symbol:
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raise QAPIParseError(self._parser, "invalid name")
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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):
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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):
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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):
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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(self, symbols_dict, name, indent):
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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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self._end_section()
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self._section = QAPIDoc.ArgSection(self._parser, name, indent)
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symbols_dict[name] = self._section
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def _start_args_section(self, name, indent):
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self._start_symbol_section(self.args, name, indent)
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def _start_features_section(self, name, indent):
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self._start_symbol_section(self.features, name, indent)
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def _start_section(self, name=None, indent=0):
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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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self._end_section()
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self._section = QAPIDoc.Section(self._parser, name, indent)
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self.sections.append(self._section)
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def _end_section(self):
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if self._section:
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text = self._section.text = self._section.text.strip()
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if self._section.name and (not text or text.isspace()):
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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 = None
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def _append_freeform(self, line):
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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):
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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):
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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):
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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):
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def check_args_section(args, info, what):
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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 member%s '%s' %s not exist"
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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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check_args_section(self.args, self.info, 'members')
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check_args_section(self.features, self.info, 'features')
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