#!/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"""
import re
import sys
import qapi
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
"""
lines = []
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/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:
lines.append('@enumerate')
inlist = 'enumerate'
line = line[line.find(' ')+1:]
lines.append('@item')
elif re.match(r'^[*-] ', line):
if not inlist:
lines.append('@itemize %s' % {'*': '@bullet',
'-': '@minus'}[line[0]])
inlist = 'itemize'
lines.append('@item')
line = line[2:]
elif lastempty and inlist:
lines.append('@end %s\n' % inlist)
inlist = ''
lastempty = empty
lines.append(line)
if inlist:
lines.append('@end %s\n' % inlist)
return '\n'.join(lines)
def texi_body(doc):
"""Format the main documentation body"""
return texi_format(str(doc.body)) + '\n'
def texi_enum_value(value):
"""Format a table of members item for an enumeration value"""
return '@item @code{%s}\n' % value.name
def texi_member(member, suffix=''):
"""Format a table of members item for an object type member"""
typ = member.type.doc_type()
return '@item @code{%s%s%s}%s%s\n' % (
member.name,
': ' if typ else '',
typ if typ else '',
' (optional)' if member.optional else '',
suffix)
def texi_members(doc, what, base, variants, member_func):
"""Format the table of members"""
items = ''
for section in doc.args.itervalues():
# TODO Drop fallbacks when undocumented members are outlawed
if section.content:
desc = texi_format(str(section))
elif (variants and variants.tag_member == section.member
and not section.member.type.doc_type()):
values = section.member.type.member_names()
desc = 'One of ' + ', '.join(['@t{"%s"}' % v for v in values])
else:
desc = 'Not documented'
items += member_func(section.member) + desc + '\n'
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"}' % (
variants.tag_member.name, v.name)
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, 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):
"""Format additional sections following arguments"""
body = ''
for section in doc.sections:
name, doc = (section.name, str(section))
func = texi_format
if name.startswith('Example'):
func = texi_example
if name:
# prefer @b over @strong, so txt doesn't translate it to *Foo:*
body += '\n\n@b{%s:}\n' % name
body += func(doc)
return body
def texi_entity(doc, what, base=None, variants=None,
member_func=texi_member):
return (texi_body(doc)
+ texi_members(doc, what, base, variants, member_func)
+ texi_sections(doc))
class QAPISchemaGenDocVisitor(qapi.QAPISchemaVisitor):
def __init__(self):
self.out = None
self.cur_doc = None
def visit_begin(self, schema):
self.out = ''
def visit_enum_type(self, name, info, values, prefix):
doc = self.cur_doc
if self.out:
self.out += '\n'
self.out += TYPE_FMT(type='Enum',
name=doc.symbol,
body=texi_entity(doc, 'Values',
member_func=texi_enum_value))
def visit_object_type(self, name, info, base, members, variants):
doc = self.cur_doc
if base and base.is_implicit():
base = None
if self.out:
self.out += '\n'
self.out += TYPE_FMT(type='Object',
name=doc.symbol,
body=texi_entity(doc, 'Members', base, variants))
def visit_alternate_type(self, name, info, variants):
doc = self.cur_doc
if self.out:
self.out += '\n'
self.out += TYPE_FMT(type='Alternate',
name=doc.symbol,
body=texi_entity(doc, 'Members'))
def visit_command(self, name, info, arg_type, ret_type,
gen, success_response, boxed):
doc = self.cur_doc
if self.out:
self.out += '\n'
if boxed:
body = texi_body(doc)
body += '\n@b{Arguments:} the members of @code{%s}' % arg_type.name
body += texi_sections(doc)
else:
body = texi_entity(doc, 'Arguments')
self.out += MSG_FMT(type='Command',
name=doc.symbol,
body=body)
def visit_event(self, name, info, arg_type, boxed):
doc = self.cur_doc
if self.out:
self.out += '\n'
self.out += MSG_FMT(type='Event',
name=doc.symbol,
body=texi_entity(doc, 'Arguments'))
def symbol(self, doc, entity):
self.cur_doc = doc
entity.visit(self)
self.cur_doc = None
def freeform(self, doc):
assert not doc.args
if self.out:
self.out += '\n'
self.out += texi_body(doc) + texi_sections(doc)
def texi_schema(schema):
"""Convert QAPI schema documentation to Texinfo"""
gen = QAPISchemaGenDocVisitor()
gen.visit_begin(schema)
for doc in schema.docs:
if doc.symbol:
gen.symbol(doc, schema.lookup_entity(doc.symbol))
else:
gen.freeform(doc)
return gen.out
def main(argv):
"""Takes schema argument, prints result to stdout"""
if len(argv) != 2:
print >>sys.stderr, "%s: need exactly 1 argument: SCHEMA" % argv[0]
sys.exit(1)
schema = qapi.QAPISchema(argv[1])
if not qapi.doc_required:
print >>sys.stderr, ("%s: need pragma 'doc-required' "
"to generate documentation" % argv[0])
sys.exit(1)
print texi_schema(schema)
if __name__ == '__main__':
main(sys.argv)
