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qemu/scripts/qapi/doc.py

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#!/usr/bin/env python
# QAPI texi generator
#
# This work is licensed under the terms of the GNU LGPL, version 2+.
# See the COPYING file in the top-level directory.
"""This script produces the documentation of a qapi schema in texinfo format"""
from __future__ import print_function
import re
import qapi.common
MSG_FMT = """
@deftypefn {type} {{}} {name}
{body}
@end deftypefn
""".format
TYPE_FMT = """
@deftp {{{type}}} {name}
{body}
@end deftp
""".format
EXAMPLE_FMT = """@example
{code}
@end example
""".format
def subst_strong(doc):
"""Replaces *foo* by @strong{foo}"""
return re.sub(r'\*([^*\n]+)\*', r'@strong{\1}', doc)
def subst_emph(doc):
"""Replaces _foo_ by @emph{foo}"""
return re.sub(r'\b_([^_\n]+)_\b', r'@emph{\1}', doc)
def subst_vars(doc):
"""Replaces @var by @code{var}"""
return re.sub(r'@([\w-]+)', r'@code{\1}', doc)
def subst_braces(doc):
"""Replaces {} with @{ @}"""
return doc.replace('{', '@{').replace('}', '@}')
def texi_example(doc):
"""Format @example"""
# TODO: Neglects to escape @ characters.
# We should probably escape them in subst_braces(), and rename the
# function to subst_special() or subs_texi_special(). If we do that, we
# need to delay it until after subst_vars() in texi_format().
doc = subst_braces(doc).strip('\n')
return EXAMPLE_FMT(code=doc)
def texi_format(doc):
"""
Format documentation
Lines starting with:
- |: generates an @example
- =: generates @section
- ==: generates @subsection
- 1. or 1): generates an @enumerate @item
- */-: generates an @itemize list
"""
ret = ''
doc = subst_braces(doc)
doc = subst_vars(doc)
doc = subst_emph(doc)
doc = subst_strong(doc)
inlist = ''
lastempty = False
for line in doc.split('\n'):
empty = line == ''
# FIXME: Doing this in a single if / elif chain is
# problematic. For instance, a line without markup terminates
# a list if it follows a blank line (reaches the final elif),
# but a line with some *other* markup, such as a = title
# doesn't.
#
# Make sure to update section "Documentation markup" in
# docs/devel/qapi-code-gen.txt when fixing this.
if line.startswith('| '):
line = EXAMPLE_FMT(code=line[2:])
elif line.startswith('= '):
line = '@section ' + line[2:]
elif line.startswith('== '):
line = '@subsection ' + line[3:]
elif re.match(r'^([0-9]*\.) ', line):
if not inlist:
ret += '@enumerate\n'
inlist = 'enumerate'
ret += '@item\n'
line = line[line.find(' ')+1:]
elif re.match(r'^[*-] ', line):
if not inlist:
ret += '@itemize %s\n' % {'*': '@bullet',
'-': '@minus'}[line[0]]
inlist = 'itemize'
ret += '@item\n'
line = line[2:]
elif lastempty and inlist:
ret += '@end %s\n\n' % inlist
inlist = ''
lastempty = empty
ret += line + '\n'
if inlist:
ret += '@end %s\n\n' % inlist
return ret
def texi_body(doc):
"""Format the main documentation body"""
return texi_format(doc.body.text)
def texi_if(ifcond, prefix='\n', suffix='\n'):
"""Format the #if condition"""
if not ifcond:
return ''
return '%s@b{If:} @code{%s}%s' % (prefix, ', '.join(ifcond), suffix)
def texi_enum_value(value, desc, suffix):
"""Format a table of members item for an enumeration value"""
return '@item @code{%s}\n%s%s' % (
value.name, desc, texi_if(value.ifcond, prefix='@*'))
def texi_member(member, desc, suffix):
"""Format a table of members item for an object type member"""
typ = member.type.doc_type()
membertype = ': ' + typ if typ else ''
return '@item @code{%s%s}%s%s\n%s%s' % (
member.name, membertype,
' (optional)' if member.optional else '',
suffix, desc, texi_if(member.ifcond, prefix='@*'))
def texi_members(doc, what, base, variants, member_func):
"""Format the table of members"""
items = ''
for section in doc.args.values():
# TODO Drop fallbacks when undocumented members are outlawed
if section.text:
desc = texi_format(section.text)
elif (variants and variants.tag_member == section.member
and not section.member.type.doc_type()):
values = section.member.type.member_names()
members_text = ', '.join(['@t{"%s"}' % v for v in values])
desc = 'One of ' + members_text + '\n'
else:
desc = 'Not documented\n'
items += member_func(section.member, desc, suffix='')
if base:
items += '@item The members of @code{%s}\n' % base.doc_type()
if variants:
for v in variants.variants:
when = ' when @code{%s} is @t{"%s"}%s' % (
variants.tag_member.name, v.name, texi_if(v.ifcond, " (", ")"))
if v.type.is_implicit():
assert not v.type.base and not v.type.variants
for m in v.type.local_members:
items += member_func(m, desc='', suffix=when)
else:
items += '@item The members of @code{%s}%s\n' % (
v.type.doc_type(), when)
if not items:
return ''
return '\n@b{%s:}\n@table @asis\n%s@end table\n' % (what, items)
def texi_sections(doc, ifcond):
"""Format additional sections following arguments"""
body = ''
for section in doc.sections:
if section.name:
# prefer @b over @strong, so txt doesn't translate it to *Foo:*
body += '\n@b{%s:}\n' % section.name
if section.name and section.name.startswith('Example'):
body += texi_example(section.text)
else:
body += texi_format(section.text)
body += texi_if(ifcond, suffix='')
return body
def texi_entity(doc, what, ifcond, base=None, variants=None,
member_func=texi_member):
return (texi_body(doc)
+ texi_members(doc, what, base, variants, member_func)
+ texi_sections(doc, ifcond))
class QAPISchemaGenDocVisitor(qapi.common.QAPISchemaVisitor):
def __init__(self, prefix):
self._prefix = prefix
self._gen = qapi.common.QAPIGenDoc()
self.cur_doc = None
def write(self, output_dir):
self._gen.write(output_dir, self._prefix + 'qapi-doc.texi')
def visit_enum_type(self, name, info, ifcond, members, prefix):
doc = self.cur_doc
self._gen.add(TYPE_FMT(type='Enum',
name=doc.symbol,
body=texi_entity(doc, 'Values', ifcond,
member_func=texi_enum_value)))
def visit_object_type(self, name, info, ifcond, base, members, variants):
doc = self.cur_doc
if base and base.is_implicit():
base = None
self._gen.add(TYPE_FMT(type='Object',
name=doc.symbol,
body=texi_entity(doc, 'Members', ifcond,
base, variants)))
def visit_alternate_type(self, name, info, ifcond, variants):
doc = self.cur_doc
self._gen.add(TYPE_FMT(type='Alternate',
name=doc.symbol,
body=texi_entity(doc, 'Members', ifcond)))
def visit_command(self, name, info, ifcond, arg_type, ret_type, gen,
success_response, boxed, allow_oob, allow_preconfig):
doc = self.cur_doc
if boxed:
body = texi_body(doc)
body += ('\n@b{Arguments:} the members of @code{%s}\n'
% arg_type.name)
body += texi_sections(doc, ifcond)
else:
body = texi_entity(doc, 'Arguments', ifcond)
self._gen.add(MSG_FMT(type='Command',
name=doc.symbol,
body=body))
def visit_event(self, name, info, ifcond, arg_type, boxed):
doc = self.cur_doc
self._gen.add(MSG_FMT(type='Event',
name=doc.symbol,
body=texi_entity(doc, 'Arguments', ifcond)))
def symbol(self, doc, entity):
if self._gen._body:
self._gen.add('\n')
self.cur_doc = doc
entity.visit(self)
self.cur_doc = None
def freeform(self, doc):
assert not doc.args
if self._gen._body:
self._gen.add('\n')
self._gen.add(texi_body(doc) + texi_sections(doc, None))
def gen_doc(schema, output_dir, prefix):
if not qapi.common.doc_required:
return
vis = QAPISchemaGenDocVisitor(prefix)
vis.visit_begin(schema)
for doc in schema.docs:
if doc.symbol:
vis.symbol(doc, schema.lookup_entity(doc.symbol))
else:
vis.freeform(doc)
vis.write(output_dir)
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