/
common.py
2543 lines (2124 loc) · 86.2 KB
/
common.py
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#
# QAPI helper library
#
# Copyright IBM, Corp. 2011
# Copyright (c) 2013-2018 Red Hat Inc.
#
# Authors:
# Anthony Liguori <aliguori@us.ibm.com>
# Markus Armbruster <armbru@redhat.com>
#
# This work is licensed under the terms of the GNU GPL, version 2.
# See the COPYING file in the top-level directory.
from __future__ import print_function
from contextlib import contextmanager
import errno
import os
import re
import string
import sys
from collections import OrderedDict
builtin_types = {
'null': 'QTYPE_QNULL',
'str': 'QTYPE_QSTRING',
'int': 'QTYPE_QNUM',
'number': 'QTYPE_QNUM',
'bool': 'QTYPE_QBOOL',
'int8': 'QTYPE_QNUM',
'int16': 'QTYPE_QNUM',
'int32': 'QTYPE_QNUM',
'int64': 'QTYPE_QNUM',
'uint8': 'QTYPE_QNUM',
'uint16': 'QTYPE_QNUM',
'uint32': 'QTYPE_QNUM',
'uint64': 'QTYPE_QNUM',
'size': 'QTYPE_QNUM',
'any': None, # any QType possible, actually
'QType': 'QTYPE_QSTRING',
}
# Are documentation comments required?
doc_required = False
# Whitelist of commands allowed to return a non-dictionary
returns_whitelist = []
# Whitelist of entities allowed to violate case conventions
name_case_whitelist = []
enum_types = {}
struct_types = {}
union_types = {}
all_names = {}
#
# Parsing the schema into expressions
#
def error_path(parent):
res = ''
while parent:
res = ('In file included from %s:%d:\n' % (parent['file'],
parent['line'])) + res
parent = parent['parent']
return res
class QAPIError(Exception):
def __init__(self, fname, line, col, incl_info, msg):
Exception.__init__(self)
self.fname = fname
self.line = line
self.col = col
self.info = incl_info
self.msg = msg
def __str__(self):
loc = '%s:%d' % (self.fname, self.line)
if self.col is not None:
loc += ':%s' % self.col
return error_path(self.info) + '%s: %s' % (loc, self.msg)
class QAPIParseError(QAPIError):
def __init__(self, parser, msg):
col = 1
for ch in parser.src[parser.line_pos:parser.pos]:
if ch == '\t':
col = (col + 7) % 8 + 1
else:
col += 1
QAPIError.__init__(self, parser.fname, parser.line, col,
parser.incl_info, msg)
class QAPISemError(QAPIError):
def __init__(self, info, msg):
QAPIError.__init__(self, info['file'], info['line'], None,
info['parent'], msg)
class QAPIDoc(object):
"""
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(object):
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):
QAPIDoc.Section.__init__(self, 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))
elif 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 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):
bogus = [name for name, section in self.args.items()
if not section.member]
if bogus:
raise QAPISemError(
self.info,
"The following documented members are not in "
"the declaration: %s" % ", ".join(bogus))
class QAPISchemaParser(object):
def __init__(self, fp, previously_included=[], incl_info=None):
self.fname = fp.name
previously_included.append(os.path.abspath(fp.name))
self.incl_info = incl_info
self.src = fp.read()
if self.src == '' or self.src[-1] != '\n':
self.src += '\n'
self.cursor = 0
self.line = 1
self.line_pos = 0
self.exprs = []
self.docs = []
self.accept()
cur_doc = None
while self.tok is not None:
info = {'file': self.fname, 'line': self.line,
'parent': self.incl_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(self.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['file']):
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
try:
if sys.version_info[0] >= 3:
fobj = open(incl_fname, 'r', encoding='utf-8')
else:
fobj = open(incl_fname, 'r')
except IOError as e:
raise QAPISemError(info, "%s: %s" % (e.strerror, incl_fname))
return QAPISchemaParser(fobj, previously_included, info)
def _pragma(self, name, value, info):
global doc_required, returns_whitelist, name_case_whitelist
if name == 'doc-required':
if not isinstance(value, bool):
raise QAPISemError(info,
"Pragma 'doc-required' must be boolean")
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")
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")
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.line += 1
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
else:
doc.append(self.val)
self.accept(False)
raise QAPIParseError(self, "Documentation comment must end with '##'")
#
# Semantic analysis of schema expressions
# TODO fold into QAPISchema
# TODO catching name collisions in generated code would be nice
#
def find_base_members(base):
if isinstance(base, dict):
return base
base_struct_define = struct_types.get(base)
if not base_struct_define:
return None
return base_struct_define['data']
# Return the qtype of an alternate branch, or None on error.
def find_alternate_member_qtype(qapi_type):
if qapi_type in builtin_types:
return builtin_types[qapi_type]
elif qapi_type in struct_types:
return 'QTYPE_QDICT'
elif qapi_type in enum_types:
return 'QTYPE_QSTRING'
elif qapi_type in union_types:
return 'QTYPE_QDICT'
return None
# Return the discriminator enum define if discriminator is specified as an
# enum type, otherwise return None.
def discriminator_find_enum_define(expr):
base = expr.get('base')
discriminator = expr.get('discriminator')
if not (discriminator and base):
return None
base_members = find_base_members(base)
if not base_members:
return None
discriminator_value = base_members.get(discriminator)
if not discriminator_value:
return None
return enum_types.get(discriminator_value['type'])
# Names must be letters, numbers, -, and _. They must start with letter,
# except for downstream extensions which must start with __RFQDN_.
# Dots are only valid in the downstream extension prefix.
valid_name = re.compile(r'^(__[a-zA-Z0-9.-]+_)?'
'[a-zA-Z][a-zA-Z0-9_-]*$')
def check_name(info, source, name, allow_optional=False,
enum_member=False):
global valid_name
membername = name
if not isinstance(name, str):
raise QAPISemError(info, "%s requires a string name" % source)
if name.startswith('*'):
membername = name[1:]
if not allow_optional:
raise QAPISemError(info, "%s does not allow optional name '%s'"
% (source, name))
# Enum members can start with a digit, because the generated C
# code always prefixes it with the enum name
if enum_member and membername[0].isdigit():
membername = 'D' + membername
# Reserve the entire 'q_' namespace for c_name(), and for 'q_empty'
# and 'q_obj_*' implicit type names.
if not valid_name.match(membername) or \
c_name(membername, False).startswith('q_'):
raise QAPISemError(info, "%s uses invalid name '%s'" % (source, name))
def add_name(name, info, meta, implicit=False):
global all_names
check_name(info, "'%s'" % meta, name)
# FIXME should reject names that differ only in '_' vs. '.'
# vs. '-', because they're liable to clash in generated C.
if name in all_names:
raise QAPISemError(info, "%s '%s' is already defined"
% (all_names[name], name))
if not implicit and (name.endswith('Kind') or name.endswith('List')):
raise QAPISemError(info, "%s '%s' should not end in '%s'"
% (meta, name, name[-4:]))
all_names[name] = meta
def check_if(expr, info):
def check_if_str(ifcond, info):
if not isinstance(ifcond, str):
raise QAPISemError(
info, "'if' condition must be a string or a list of strings")
if ifcond.strip() == '':
raise QAPISemError(info, "'if' condition '%s' makes no sense"
% ifcond)
ifcond = expr.get('if')
if ifcond is None:
return
if isinstance(ifcond, list):
if ifcond == []:
raise QAPISemError(info, "'if' condition [] is useless")
for elt in ifcond:
check_if_str(elt, info)
else:
check_if_str(ifcond, info)
def check_type(info, source, value,
allow_array=False, allow_dict=False, allow_metas=[]):
global all_names
if value is None:
return
# Check if array type for value is okay
if isinstance(value, list):
if not allow_array:
raise QAPISemError(info, "%s cannot be an array" % source)
if len(value) != 1 or not isinstance(value[0], str):
raise QAPISemError(info,
"%s: array type must contain single type name" %
source)
value = value[0]
# Check if type name for value is okay
if isinstance(value, str):
if value not in all_names:
raise QAPISemError(info, "%s uses unknown type '%s'"
% (source, value))
if not all_names[value] in allow_metas:
raise QAPISemError(info, "%s cannot use %s type '%s'" %
(source, all_names[value], value))
return
if not allow_dict:
raise QAPISemError(info, "%s should be a type name" % source)
if not isinstance(value, OrderedDict):
raise QAPISemError(info,
"%s should be an object or type name" % source)
# value is a dictionary, check that each member is okay
for (key, arg) in value.items():
check_name(info, "Member of %s" % source, key,
allow_optional=True)
if c_name(key, False) == 'u' or c_name(key, False).startswith('has_'):
raise QAPISemError(info, "Member of %s uses reserved name '%s'"
% (source, key))
# Todo: allow dictionaries to represent default values of
# an optional argument.
check_known_keys(info, "member '%s' of %s" % (key, source),
arg, ['type'], ['if'])
check_if(arg, info)
normalize_if(arg)
check_type(info, "Member '%s' of %s" % (key, source),
arg['type'], allow_array=True,
allow_metas=['built-in', 'union', 'alternate', 'struct',
'enum'])
def check_command(expr, info):
name = expr['command']
boxed = expr.get('boxed', False)
args_meta = ['struct']
if boxed:
args_meta += ['union']
check_type(info, "'data' for command '%s'" % name,
expr.get('data'), allow_dict=not boxed,
allow_metas=args_meta)
returns_meta = ['union', 'struct']
if name in returns_whitelist:
returns_meta += ['built-in', 'alternate', 'enum']
check_type(info, "'returns' for command '%s'" % name,
expr.get('returns'), allow_array=True,
allow_metas=returns_meta)
def check_event(expr, info):
name = expr['event']
boxed = expr.get('boxed', False)
meta = ['struct']
if boxed:
meta += ['union']
check_type(info, "'data' for event '%s'" % name,
expr.get('data'), allow_dict=not boxed,
allow_metas=meta)
def enum_get_names(expr):
return [e['name'] for e in expr['data']]
def check_union(expr, info):
name = expr['union']
base = expr.get('base')
discriminator = expr.get('discriminator')
members = expr['data']
# Two types of unions, determined by discriminator.
# With no discriminator it is a simple union.
if discriminator is None:
enum_values = members.keys()
allow_metas = ['built-in', 'union', 'alternate', 'struct', 'enum']
if base is not None:
raise QAPISemError(info, "Simple union '%s' must not have a base" %
name)
# Else, it's a flat union.
else:
# The object must have a string or dictionary 'base'.
check_type(info, "'base' for union '%s'" % name,
base, allow_dict=True,
allow_metas=['struct'])
if not base:
raise QAPISemError(info, "Flat union '%s' must have a base"
% name)
base_members = find_base_members(base)
assert base_members is not None
# The value of member 'discriminator' must name a non-optional
# member of the base struct.
check_name(info, "Discriminator of flat union '%s'" % name,
discriminator)
discriminator_value = base_members.get(discriminator)
if not discriminator_value:
raise QAPISemError(info,
"Discriminator '%s' is not a member of 'base'"
% discriminator)
if discriminator_value.get('if'):
raise QAPISemError(
info,
"The discriminator '%s' for union %s must not be conditional"
% (discriminator, name))
enum_define = enum_types.get(discriminator_value['type'])
# Do not allow string discriminator
if not enum_define:
raise QAPISemError(info,
"Discriminator '%s' must be of enumeration "
"type" % discriminator)
enum_values = enum_get_names(enum_define)
allow_metas = ['struct']
if (len(enum_values) == 0):
raise QAPISemError(info, "Union '%s' has no branches" % name)
for (key, value) in members.items():
check_name(info, "Member of union '%s'" % name, key)
check_known_keys(info, "member '%s' of union '%s'" % (key, name),
value, ['type'], ['if'])
check_if(value, info)
normalize_if(value)
# Each value must name a known type
check_type(info, "Member '%s' of union '%s'" % (key, name),
value['type'],
allow_array=not base, allow_metas=allow_metas)
# If the discriminator names an enum type, then all members
# of 'data' must also be members of the enum type.
if discriminator is not None:
if key not in enum_values:
raise QAPISemError(info,
"Discriminator value '%s' is not found in "
"enum '%s'"
% (key, enum_define['enum']))
def check_alternate(expr, info):
name = expr['alternate']
members = expr['data']
types_seen = {}
if len(members) == 0:
raise QAPISemError(info,
"Alternate '%s' cannot have empty 'data'" % name)
for (key, value) in members.items():
check_name(info, "Member of alternate '%s'" % name, key)
check_known_keys(info,
"member '%s' of alternate '%s'" % (key, name),
value, ['type'], ['if'])
check_if(value, info)
normalize_if(value)
typ = value['type']
# Ensure alternates have no type conflicts.
check_type(info, "Member '%s' of alternate '%s'" % (key, name), typ,
allow_metas=['built-in', 'union', 'struct', 'enum'])
qtype = find_alternate_member_qtype(typ)
if not qtype:
raise QAPISemError(info, "Alternate '%s' member '%s' cannot use "
"type '%s'" % (name, key, typ))
conflicting = set([qtype])
if qtype == 'QTYPE_QSTRING':
enum_expr = enum_types.get(typ)
if enum_expr:
for v in enum_get_names(enum_expr):
if v in ['on', 'off']:
conflicting.add('QTYPE_QBOOL')
if re.match(r'[-+0-9.]', v): # lazy, could be tightened
conflicting.add('QTYPE_QNUM')
else:
conflicting.add('QTYPE_QNUM')
conflicting.add('QTYPE_QBOOL')
for qt in conflicting:
if qt in types_seen:
raise QAPISemError(info, "Alternate '%s' member '%s' can't "
"be distinguished from member '%s'"
% (name, key, types_seen[qt]))
types_seen[qt] = key
def check_enum(expr, info):
name = expr['enum']
members = expr['data']
prefix = expr.get('prefix')
if not isinstance(members, list):
raise QAPISemError(info,
"Enum '%s' requires an array for 'data'" % name)
if prefix is not None and not isinstance(prefix, str):
raise QAPISemError(info,
"Enum '%s' requires a string for 'prefix'" % name)
for member in members:
check_known_keys(info, "member of enum '%s'" % name, member,
['name'], ['if'])
check_if(member, info)
normalize_if(member)
check_name(info, "Member of enum '%s'" % name, member['name'],
enum_member=True)
def check_struct(expr, info):
name = expr['struct']
members = expr['data']
features = expr.get('features')
check_type(info, "'data' for struct '%s'" % name, members,
allow_dict=True)
check_type(info, "'base' for struct '%s'" % name, expr.get('base'),
allow_metas=['struct'])
if features:
if not isinstance(features, list):