mirror of
https://github.com/xemu-project/xemu.git
synced 2024-11-23 19:49:43 +00:00
8ec0e1a4e6
Signed-off-by: Markus Armbruster <armbru@redhat.com> Message-Id: <20200304155932.20452-5-armbru@redhat.com> Reviewed-by: John Snow <jsnow@redhat.com>
580 lines
21 KiB
Python
580 lines
21 KiB
Python
# -*- coding: utf-8 -*-
|
|
#
|
|
# QAPI schema parser
|
|
#
|
|
# Copyright IBM, Corp. 2011
|
|
# Copyright (c) 2013-2019 Red Hat Inc.
|
|
#
|
|
# Authors:
|
|
# Anthony Liguori <aliguori@us.ibm.com>
|
|
# Markus Armbruster <armbru@redhat.com>
|
|
# Marc-André Lureau <marcandre.lureau@redhat.com>
|
|
# Kevin Wolf <kwolf@redhat.com>
|
|
#
|
|
# This work is licensed under the terms of the GNU GPL, version 2.
|
|
# See the COPYING file in the top-level directory.
|
|
|
|
import os
|
|
import re
|
|
from collections import OrderedDict
|
|
|
|
from qapi.error import QAPIParseError, QAPISemError
|
|
from qapi.source import QAPISourceInfo
|
|
|
|
|
|
class QAPISchemaParser:
|
|
|
|
def __init__(self, fname, previously_included=None, incl_info=None):
|
|
previously_included = previously_included or set()
|
|
previously_included.add(os.path.abspath(fname))
|
|
|
|
try:
|
|
fp = open(fname, 'r', encoding='utf-8')
|
|
self.src = fp.read()
|
|
except IOError as e:
|
|
raise QAPISemError(incl_info or QAPISourceInfo(None, None, None),
|
|
"can't read %s file '%s': %s"
|
|
% ("include" if incl_info else "schema",
|
|
fname,
|
|
e.strerror))
|
|
|
|
if self.src == '' or self.src[-1] != '\n':
|
|
self.src += '\n'
|
|
self.cursor = 0
|
|
self.info = QAPISourceInfo(fname, 1, incl_info)
|
|
self.line_pos = 0
|
|
self.exprs = []
|
|
self.docs = []
|
|
self.accept()
|
|
cur_doc = None
|
|
|
|
while self.tok is not None:
|
|
info = self.info
|
|
if self.tok == '#':
|
|
self.reject_expr_doc(cur_doc)
|
|
cur_doc = self.get_doc(info)
|
|
self.docs.append(cur_doc)
|
|
continue
|
|
|
|
expr = self.get_expr(False)
|
|
if 'include' in expr:
|
|
self.reject_expr_doc(cur_doc)
|
|
if len(expr) != 1:
|
|
raise QAPISemError(info, "invalid 'include' directive")
|
|
include = expr['include']
|
|
if not isinstance(include, str):
|
|
raise QAPISemError(info,
|
|
"value of 'include' must be a string")
|
|
incl_fname = os.path.join(os.path.dirname(fname),
|
|
include)
|
|
self.exprs.append({'expr': {'include': incl_fname},
|
|
'info': info})
|
|
exprs_include = self._include(include, info, incl_fname,
|
|
previously_included)
|
|
if exprs_include:
|
|
self.exprs.extend(exprs_include.exprs)
|
|
self.docs.extend(exprs_include.docs)
|
|
elif "pragma" in expr:
|
|
self.reject_expr_doc(cur_doc)
|
|
if len(expr) != 1:
|
|
raise QAPISemError(info, "invalid 'pragma' directive")
|
|
pragma = expr['pragma']
|
|
if not isinstance(pragma, dict):
|
|
raise QAPISemError(
|
|
info, "value of 'pragma' must be an object")
|
|
for name, value in pragma.items():
|
|
self._pragma(name, value, info)
|
|
else:
|
|
expr_elem = {'expr': expr,
|
|
'info': info}
|
|
if cur_doc:
|
|
if not cur_doc.symbol:
|
|
raise QAPISemError(
|
|
cur_doc.info, "definition documentation required")
|
|
expr_elem['doc'] = cur_doc
|
|
self.exprs.append(expr_elem)
|
|
cur_doc = None
|
|
self.reject_expr_doc(cur_doc)
|
|
|
|
@staticmethod
|
|
def reject_expr_doc(doc):
|
|
if doc and doc.symbol:
|
|
raise QAPISemError(
|
|
doc.info,
|
|
"documentation for '%s' is not followed by the definition"
|
|
% doc.symbol)
|
|
|
|
def _include(self, include, info, incl_fname, previously_included):
|
|
incl_abs_fname = os.path.abspath(incl_fname)
|
|
# catch inclusion cycle
|
|
inf = info
|
|
while inf:
|
|
if incl_abs_fname == os.path.abspath(inf.fname):
|
|
raise QAPISemError(info, "inclusion loop for %s" % include)
|
|
inf = inf.parent
|
|
|
|
# skip multiple include of the same file
|
|
if incl_abs_fname in previously_included:
|
|
return None
|
|
|
|
return QAPISchemaParser(incl_fname, previously_included, info)
|
|
|
|
def _pragma(self, name, value, info):
|
|
if name == 'doc-required':
|
|
if not isinstance(value, bool):
|
|
raise QAPISemError(info,
|
|
"pragma 'doc-required' must be boolean")
|
|
info.pragma.doc_required = value
|
|
elif name == 'returns-whitelist':
|
|
if (not isinstance(value, list)
|
|
or any([not isinstance(elt, str) for elt in value])):
|
|
raise QAPISemError(
|
|
info,
|
|
"pragma returns-whitelist must be a list of strings")
|
|
info.pragma.returns_whitelist = value
|
|
elif name == 'name-case-whitelist':
|
|
if (not isinstance(value, list)
|
|
or any([not isinstance(elt, str) for elt in value])):
|
|
raise QAPISemError(
|
|
info,
|
|
"pragma name-case-whitelist must be a list of strings")
|
|
info.pragma.name_case_whitelist = value
|
|
else:
|
|
raise QAPISemError(info, "unknown pragma '%s'" % name)
|
|
|
|
def accept(self, skip_comment=True):
|
|
while True:
|
|
self.tok = self.src[self.cursor]
|
|
self.pos = self.cursor
|
|
self.cursor += 1
|
|
self.val = None
|
|
|
|
if self.tok == '#':
|
|
if self.src[self.cursor] == '#':
|
|
# Start of doc comment
|
|
skip_comment = False
|
|
self.cursor = self.src.find('\n', self.cursor)
|
|
if not skip_comment:
|
|
self.val = self.src[self.pos:self.cursor]
|
|
return
|
|
elif self.tok in '{}:,[]':
|
|
return
|
|
elif self.tok == "'":
|
|
# Note: we accept only printable ASCII
|
|
string = ''
|
|
esc = False
|
|
while True:
|
|
ch = self.src[self.cursor]
|
|
self.cursor += 1
|
|
if ch == '\n':
|
|
raise QAPIParseError(self, "missing terminating \"'\"")
|
|
if esc:
|
|
# Note: we recognize only \\ because we have
|
|
# no use for funny characters in strings
|
|
if ch != '\\':
|
|
raise QAPIParseError(self,
|
|
"unknown escape \\%s" % ch)
|
|
esc = False
|
|
elif ch == '\\':
|
|
esc = True
|
|
continue
|
|
elif ch == "'":
|
|
self.val = string
|
|
return
|
|
if ord(ch) < 32 or ord(ch) >= 127:
|
|
raise QAPIParseError(
|
|
self, "funny character in string")
|
|
string += ch
|
|
elif self.src.startswith('true', self.pos):
|
|
self.val = True
|
|
self.cursor += 3
|
|
return
|
|
elif self.src.startswith('false', self.pos):
|
|
self.val = False
|
|
self.cursor += 4
|
|
return
|
|
elif self.tok == '\n':
|
|
if self.cursor == len(self.src):
|
|
self.tok = None
|
|
return
|
|
self.info = self.info.next_line()
|
|
self.line_pos = self.cursor
|
|
elif not self.tok.isspace():
|
|
# Show up to next structural, whitespace or quote
|
|
# character
|
|
match = re.match('[^[\\]{}:,\\s\'"]+',
|
|
self.src[self.cursor-1:])
|
|
raise QAPIParseError(self, "stray '%s'" % match.group(0))
|
|
|
|
def get_members(self):
|
|
expr = OrderedDict()
|
|
if self.tok == '}':
|
|
self.accept()
|
|
return expr
|
|
if self.tok != "'":
|
|
raise QAPIParseError(self, "expected string or '}'")
|
|
while True:
|
|
key = self.val
|
|
self.accept()
|
|
if self.tok != ':':
|
|
raise QAPIParseError(self, "expected ':'")
|
|
self.accept()
|
|
if key in expr:
|
|
raise QAPIParseError(self, "duplicate key '%s'" % key)
|
|
expr[key] = self.get_expr(True)
|
|
if self.tok == '}':
|
|
self.accept()
|
|
return expr
|
|
if self.tok != ',':
|
|
raise QAPIParseError(self, "expected ',' or '}'")
|
|
self.accept()
|
|
if self.tok != "'":
|
|
raise QAPIParseError(self, "expected string")
|
|
|
|
def get_values(self):
|
|
expr = []
|
|
if self.tok == ']':
|
|
self.accept()
|
|
return expr
|
|
if self.tok not in "{['tfn":
|
|
raise QAPIParseError(
|
|
self, "expected '{', '[', ']', string, boolean or 'null'")
|
|
while True:
|
|
expr.append(self.get_expr(True))
|
|
if self.tok == ']':
|
|
self.accept()
|
|
return expr
|
|
if self.tok != ',':
|
|
raise QAPIParseError(self, "expected ',' or ']'")
|
|
self.accept()
|
|
|
|
def get_expr(self, nested):
|
|
if self.tok != '{' and not nested:
|
|
raise QAPIParseError(self, "expected '{'")
|
|
if self.tok == '{':
|
|
self.accept()
|
|
expr = self.get_members()
|
|
elif self.tok == '[':
|
|
self.accept()
|
|
expr = self.get_values()
|
|
elif self.tok in "'tfn":
|
|
expr = self.val
|
|
self.accept()
|
|
else:
|
|
raise QAPIParseError(
|
|
self, "expected '{', '[', string, boolean or 'null'")
|
|
return expr
|
|
|
|
def get_doc(self, info):
|
|
if self.val != '##':
|
|
raise QAPIParseError(
|
|
self, "junk after '##' at start of documentation comment")
|
|
|
|
doc = QAPIDoc(self, info)
|
|
self.accept(False)
|
|
while self.tok == '#':
|
|
if self.val.startswith('##'):
|
|
# End of doc comment
|
|
if self.val != '##':
|
|
raise QAPIParseError(
|
|
self,
|
|
"junk after '##' at end of documentation comment")
|
|
doc.end_comment()
|
|
self.accept()
|
|
return doc
|
|
doc.append(self.val)
|
|
self.accept(False)
|
|
|
|
raise QAPIParseError(self, "documentation comment must end with '##'")
|
|
|
|
|
|
class QAPIDoc:
|
|
"""
|
|
A documentation comment block, either definition or free-form
|
|
|
|
Definition documentation blocks consist of
|
|
|
|
* a body section: one line naming the definition, followed by an
|
|
overview (any number of lines)
|
|
|
|
* argument sections: a description of each argument (for commands
|
|
and events) or member (for structs, unions and alternates)
|
|
|
|
* features sections: a description of each feature flag
|
|
|
|
* additional (non-argument) sections, possibly tagged
|
|
|
|
Free-form documentation blocks consist only of a body section.
|
|
"""
|
|
|
|
class Section:
|
|
def __init__(self, name=None):
|
|
# optional section name (argument/member or section name)
|
|
self.name = name
|
|
# the list of lines for this section
|
|
self.text = ''
|
|
|
|
def append(self, line):
|
|
self.text += line.rstrip() + '\n'
|
|
|
|
class ArgSection(Section):
|
|
def __init__(self, name):
|
|
super().__init__(name)
|
|
self.member = None
|
|
|
|
def connect(self, member):
|
|
self.member = member
|
|
|
|
def __init__(self, parser, info):
|
|
# self._parser is used to report errors with QAPIParseError. The
|
|
# resulting error position depends on the state of the parser.
|
|
# It happens to be the beginning of the comment. More or less
|
|
# servicable, but action at a distance.
|
|
self._parser = parser
|
|
self.info = info
|
|
self.symbol = None
|
|
self.body = QAPIDoc.Section()
|
|
# dict mapping parameter name to ArgSection
|
|
self.args = OrderedDict()
|
|
self.features = OrderedDict()
|
|
# a list of Section
|
|
self.sections = []
|
|
# the current section
|
|
self._section = self.body
|
|
self._append_line = self._append_body_line
|
|
|
|
def has_section(self, name):
|
|
"""Return True if we have a section with this name."""
|
|
for i in self.sections:
|
|
if i.name == name:
|
|
return True
|
|
return False
|
|
|
|
def append(self, line):
|
|
"""
|
|
Parse a comment line and add it to the documentation.
|
|
|
|
The way that the line is dealt with depends on which part of
|
|
the documentation we're parsing right now:
|
|
* The body section: ._append_line is ._append_body_line
|
|
* An argument section: ._append_line is ._append_args_line
|
|
* A features section: ._append_line is ._append_features_line
|
|
* An additional section: ._append_line is ._append_various_line
|
|
"""
|
|
line = line[1:]
|
|
if not line:
|
|
self._append_freeform(line)
|
|
return
|
|
|
|
if line[0] != ' ':
|
|
raise QAPIParseError(self._parser, "missing space after #")
|
|
line = line[1:]
|
|
self._append_line(line)
|
|
|
|
def end_comment(self):
|
|
self._end_section()
|
|
|
|
@staticmethod
|
|
def _is_section_tag(name):
|
|
return name in ('Returns:', 'Since:',
|
|
# those are often singular or plural
|
|
'Note:', 'Notes:',
|
|
'Example:', 'Examples:',
|
|
'TODO:')
|
|
|
|
def _append_body_line(self, line):
|
|
"""
|
|
Process a line of documentation text in the body section.
|
|
|
|
If this a symbol line and it is the section's first line, this
|
|
is a definition documentation block for that symbol.
|
|
|
|
If it's a definition documentation block, another symbol line
|
|
begins the argument section for the argument named by it, and
|
|
a section tag begins an additional section. Start that
|
|
section and append the line to it.
|
|
|
|
Else, append the line to the current section.
|
|
"""
|
|
name = line.split(' ', 1)[0]
|
|
# FIXME not nice: things like '# @foo:' and '# @foo: ' aren't
|
|
# recognized, and get silently treated as ordinary text
|
|
if not self.symbol and not self.body.text and line.startswith('@'):
|
|
if not line.endswith(':'):
|
|
raise QAPIParseError(self._parser, "line should end with ':'")
|
|
self.symbol = line[1:-1]
|
|
# FIXME invalid names other than the empty string aren't flagged
|
|
if not self.symbol:
|
|
raise QAPIParseError(self._parser, "invalid name")
|
|
elif self.symbol:
|
|
# This is a definition documentation block
|
|
if name.startswith('@') and name.endswith(':'):
|
|
self._append_line = self._append_args_line
|
|
self._append_args_line(line)
|
|
elif line == 'Features:':
|
|
self._append_line = self._append_features_line
|
|
elif self._is_section_tag(name):
|
|
self._append_line = self._append_various_line
|
|
self._append_various_line(line)
|
|
else:
|
|
self._append_freeform(line.strip())
|
|
else:
|
|
# This is a free-form documentation block
|
|
self._append_freeform(line.strip())
|
|
|
|
def _append_args_line(self, line):
|
|
"""
|
|
Process a line of documentation text in an argument section.
|
|
|
|
A symbol line begins the next argument section, a section tag
|
|
section or a non-indented line after a blank line begins an
|
|
additional section. Start that section and append the line to
|
|
it.
|
|
|
|
Else, append the line to the current section.
|
|
|
|
"""
|
|
name = line.split(' ', 1)[0]
|
|
|
|
if name.startswith('@') and name.endswith(':'):
|
|
line = line[len(name)+1:]
|
|
self._start_args_section(name[1:-1])
|
|
elif self._is_section_tag(name):
|
|
self._append_line = self._append_various_line
|
|
self._append_various_line(line)
|
|
return
|
|
elif (self._section.text.endswith('\n\n')
|
|
and line and not line[0].isspace()):
|
|
if line == 'Features:':
|
|
self._append_line = self._append_features_line
|
|
else:
|
|
self._start_section()
|
|
self._append_line = self._append_various_line
|
|
self._append_various_line(line)
|
|
return
|
|
|
|
self._append_freeform(line.strip())
|
|
|
|
def _append_features_line(self, line):
|
|
name = line.split(' ', 1)[0]
|
|
|
|
if name.startswith('@') and name.endswith(':'):
|
|
line = line[len(name)+1:]
|
|
self._start_features_section(name[1:-1])
|
|
elif self._is_section_tag(name):
|
|
self._append_line = self._append_various_line
|
|
self._append_various_line(line)
|
|
return
|
|
elif (self._section.text.endswith('\n\n')
|
|
and line and not line[0].isspace()):
|
|
self._start_section()
|
|
self._append_line = self._append_various_line
|
|
self._append_various_line(line)
|
|
return
|
|
|
|
self._append_freeform(line.strip())
|
|
|
|
def _append_various_line(self, line):
|
|
"""
|
|
Process a line of documentation text in an additional section.
|
|
|
|
A symbol line is an error.
|
|
|
|
A section tag begins an additional section. Start that
|
|
section and append the line to it.
|
|
|
|
Else, append the line to the current section.
|
|
"""
|
|
name = line.split(' ', 1)[0]
|
|
|
|
if name.startswith('@') and name.endswith(':'):
|
|
raise QAPIParseError(self._parser,
|
|
"'%s' can't follow '%s' section"
|
|
% (name, self.sections[0].name))
|
|
if self._is_section_tag(name):
|
|
line = line[len(name)+1:]
|
|
self._start_section(name[:-1])
|
|
|
|
if (not self._section.name or
|
|
not self._section.name.startswith('Example')):
|
|
line = line.strip()
|
|
|
|
self._append_freeform(line)
|
|
|
|
def _start_symbol_section(self, symbols_dict, name):
|
|
# FIXME invalid names other than the empty string aren't flagged
|
|
if not name:
|
|
raise QAPIParseError(self._parser, "invalid parameter name")
|
|
if name in symbols_dict:
|
|
raise QAPIParseError(self._parser,
|
|
"'%s' parameter name duplicated" % name)
|
|
assert not self.sections
|
|
self._end_section()
|
|
self._section = QAPIDoc.ArgSection(name)
|
|
symbols_dict[name] = self._section
|
|
|
|
def _start_args_section(self, name):
|
|
self._start_symbol_section(self.args, name)
|
|
|
|
def _start_features_section(self, name):
|
|
self._start_symbol_section(self.features, name)
|
|
|
|
def _start_section(self, name=None):
|
|
if name in ('Returns', 'Since') and self.has_section(name):
|
|
raise QAPIParseError(self._parser,
|
|
"duplicated '%s' section" % name)
|
|
self._end_section()
|
|
self._section = QAPIDoc.Section(name)
|
|
self.sections.append(self._section)
|
|
|
|
def _end_section(self):
|
|
if self._section:
|
|
text = self._section.text = self._section.text.strip()
|
|
if self._section.name and (not text or text.isspace()):
|
|
raise QAPIParseError(
|
|
self._parser,
|
|
"empty doc section '%s'" % self._section.name)
|
|
self._section = None
|
|
|
|
def _append_freeform(self, line):
|
|
match = re.match(r'(@\S+:)', line)
|
|
if match:
|
|
raise QAPIParseError(self._parser,
|
|
"'%s' not allowed in free-form documentation"
|
|
% match.group(1))
|
|
self._section.append(line)
|
|
|
|
def connect_member(self, member):
|
|
if member.name not in self.args:
|
|
# Undocumented TODO outlaw
|
|
self.args[member.name] = QAPIDoc.ArgSection(member.name)
|
|
self.args[member.name].connect(member)
|
|
|
|
def connect_feature(self, feature):
|
|
if feature.name not in self.features:
|
|
raise QAPISemError(feature.info,
|
|
"feature '%s' lacks documentation"
|
|
% feature.name)
|
|
self.features[feature.name].connect(feature)
|
|
|
|
def check_expr(self, expr):
|
|
if self.has_section('Returns') and 'command' not in expr:
|
|
raise QAPISemError(self.info,
|
|
"'Returns:' is only valid for commands")
|
|
|
|
def check(self):
|
|
|
|
def check_args_section(args, info, what):
|
|
bogus = [name for name, section in args.items()
|
|
if not section.member]
|
|
if bogus:
|
|
raise QAPISemError(
|
|
self.info,
|
|
"documented member%s '%s' %s not exist"
|
|
% ("s" if len(bogus) > 1 else "",
|
|
"', '".join(bogus),
|
|
"do" if len(bogus) > 1 else "does"))
|
|
|
|
check_args_section(self.args, self.info, 'members')
|
|
check_args_section(self.features, self.info, 'features')
|