43e0d14ee0
Freeform sections with titles are currently generating a TOC entry for
the first paragraph in the section after the header, which is not what
we want.
(Easiest to observe directly in the QMP reference manual's
"Introduction" section.)
When freeform sections are parsed, we create both a section header *and*
an empty, title-less section. This causes some problems with sphinx's
post-parse tree transforms, see also 2664f317 - this is a similar issue:
Sphinx doesn't like section-less titles and it also doesn't like
title-less sections.
Modify qapidoc.py to parse text directly into the preceding section
title as child nodes, eliminating the section duplication. This removes
the extra text from the TOC.
Only very, very lightly tested: "it looks right at a glance" ™️. I am
still in the process of rewriting qapidoc, so I didn't give it much
deeper thought.
Reported-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: John Snow <jsnow@redhat.com>
Message-ID: <20240822204803.1649762-1-jsnow@redhat.com>
650 lines
24 KiB
Python
650 lines
24 KiB
Python
# coding=utf-8
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#
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# QEMU qapidoc QAPI file parsing extension
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#
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# Copyright (c) 2020 Linaro
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#
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# This work is licensed under the terms of the GNU GPLv2 or later.
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# See the COPYING file in the top-level directory.
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"""
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qapidoc is a Sphinx extension that implements the qapi-doc directive
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The purpose of this extension is to read the documentation comments
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in QAPI schema files, and insert them all into the current document.
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It implements one new rST directive, "qapi-doc::".
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Each qapi-doc:: directive takes one argument, which is the
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pathname of the schema file to process, relative to the source tree.
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The docs/conf.py file must set the qapidoc_srctree config value to
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the root of the QEMU source tree.
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The Sphinx documentation on writing extensions is at:
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https://www.sphinx-doc.org/en/master/development/index.html
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"""
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import os
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import re
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import sys
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import textwrap
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from typing import List
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from docutils import nodes
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from docutils.parsers.rst import Directive, directives
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from docutils.statemachine import ViewList
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from qapi.error import QAPIError, QAPISemError
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from qapi.gen import QAPISchemaVisitor
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from qapi.schema import QAPISchema
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from sphinx import addnodes
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from sphinx.directives.code import CodeBlock
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from sphinx.errors import ExtensionError
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from sphinx.util.docutils import switch_source_input
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from sphinx.util.nodes import nested_parse_with_titles
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__version__ = "1.0"
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def dedent(text: str) -> str:
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# Adjust indentation to make description text parse as paragraph.
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lines = text.splitlines(True)
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if re.match(r"\s+", lines[0]):
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# First line is indented; description started on the line after
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# the name. dedent the whole block.
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return textwrap.dedent(text)
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# Descr started on same line. Dedent line 2+.
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return lines[0] + textwrap.dedent("".join(lines[1:]))
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# Disable black auto-formatter until re-enabled:
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# fmt: off
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class QAPISchemaGenRSTVisitor(QAPISchemaVisitor):
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"""A QAPI schema visitor which generates docutils/Sphinx nodes
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This class builds up a tree of docutils/Sphinx nodes corresponding
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to documentation for the various QAPI objects. To use it, first
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create a QAPISchemaGenRSTVisitor object, and call its
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visit_begin() method. Then you can call one of the two methods
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'freeform' (to add documentation for a freeform documentation
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chunk) or 'symbol' (to add documentation for a QAPI symbol). These
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will cause the visitor to build up the tree of document
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nodes. Once you've added all the documentation via 'freeform' and
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'symbol' method calls, you can call 'get_document_nodes' to get
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the final list of document nodes (in a form suitable for returning
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from a Sphinx directive's 'run' method).
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"""
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def __init__(self, sphinx_directive):
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self._cur_doc = None
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self._sphinx_directive = sphinx_directive
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self._top_node = nodes.section()
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self._active_headings = [self._top_node]
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def _make_dlitem(self, term, defn):
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"""Return a dlitem node with the specified term and definition.
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term should be a list of Text and literal nodes.
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defn should be one of:
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- a string, which will be handed to _parse_text_into_node
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- a list of Text and literal nodes, which will be put into
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a paragraph node
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"""
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dlitem = nodes.definition_list_item()
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dlterm = nodes.term('', '', *term)
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dlitem += dlterm
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if defn:
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dldef = nodes.definition()
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if isinstance(defn, list):
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dldef += nodes.paragraph('', '', *defn)
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else:
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self._parse_text_into_node(defn, dldef)
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dlitem += dldef
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return dlitem
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def _make_section(self, title):
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"""Return a section node with optional title"""
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section = nodes.section(ids=[self._sphinx_directive.new_serialno()])
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if title:
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section += nodes.title(title, title)
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return section
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def _nodes_for_ifcond(self, ifcond, with_if=True):
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"""Return list of Text, literal nodes for the ifcond
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Return a list which gives text like ' (If: condition)'.
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If with_if is False, we don't return the "(If: " and ")".
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"""
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doc = ifcond.docgen()
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if not doc:
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return []
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doc = nodes.literal('', doc)
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if not with_if:
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return [doc]
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nodelist = [nodes.Text(' ('), nodes.strong('', 'If: ')]
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nodelist.append(doc)
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nodelist.append(nodes.Text(')'))
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return nodelist
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def _nodes_for_one_member(self, member):
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"""Return list of Text, literal nodes for this member
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Return a list of doctree nodes which give text like
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'name: type (optional) (If: ...)' suitable for use as the
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'term' part of a definition list item.
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"""
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term = [nodes.literal('', member.name)]
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if member.type.doc_type():
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term.append(nodes.Text(': '))
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term.append(nodes.literal('', member.type.doc_type()))
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if member.optional:
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term.append(nodes.Text(' (optional)'))
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if member.ifcond.is_present():
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term.extend(self._nodes_for_ifcond(member.ifcond))
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return term
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def _nodes_for_variant_when(self, branches, variant):
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"""Return list of Text, literal nodes for variant 'when' clause
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Return a list of doctree nodes which give text like
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'when tagname is variant (If: ...)' suitable for use in
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the 'branches' part of a definition list.
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"""
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term = [nodes.Text(' when '),
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nodes.literal('', branches.tag_member.name),
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nodes.Text(' is '),
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nodes.literal('', '"%s"' % variant.name)]
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if variant.ifcond.is_present():
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term.extend(self._nodes_for_ifcond(variant.ifcond))
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return term
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def _nodes_for_members(self, doc, what, base=None, branches=None):
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"""Return list of doctree nodes for the table of members"""
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dlnode = nodes.definition_list()
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for section in doc.args.values():
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term = self._nodes_for_one_member(section.member)
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# TODO drop fallbacks when undocumented members are outlawed
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if section.text:
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defn = dedent(section.text)
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else:
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defn = [nodes.Text('Not documented')]
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dlnode += self._make_dlitem(term, defn)
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if base:
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dlnode += self._make_dlitem([nodes.Text('The members of '),
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nodes.literal('', base.doc_type())],
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None)
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if branches:
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for v in branches.variants:
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if v.type.name == 'q_empty':
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continue
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assert not v.type.is_implicit()
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term = [nodes.Text('The members of '),
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nodes.literal('', v.type.doc_type())]
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term.extend(self._nodes_for_variant_when(branches, v))
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dlnode += self._make_dlitem(term, None)
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if not dlnode.children:
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return []
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section = self._make_section(what)
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section += dlnode
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return [section]
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def _nodes_for_enum_values(self, doc):
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"""Return list of doctree nodes for the table of enum values"""
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seen_item = False
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dlnode = nodes.definition_list()
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for section in doc.args.values():
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termtext = [nodes.literal('', section.member.name)]
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if section.member.ifcond.is_present():
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termtext.extend(self._nodes_for_ifcond(section.member.ifcond))
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# TODO drop fallbacks when undocumented members are outlawed
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if section.text:
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defn = dedent(section.text)
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else:
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defn = [nodes.Text('Not documented')]
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dlnode += self._make_dlitem(termtext, defn)
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seen_item = True
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if not seen_item:
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return []
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section = self._make_section('Values')
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section += dlnode
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return [section]
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def _nodes_for_arguments(self, doc, arg_type):
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"""Return list of doctree nodes for the arguments section"""
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if arg_type and not arg_type.is_implicit():
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assert not doc.args
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section = self._make_section('Arguments')
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dlnode = nodes.definition_list()
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dlnode += self._make_dlitem(
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[nodes.Text('The members of '),
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nodes.literal('', arg_type.name)],
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None)
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section += dlnode
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return [section]
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return self._nodes_for_members(doc, 'Arguments')
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def _nodes_for_features(self, doc):
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"""Return list of doctree nodes for the table of features"""
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seen_item = False
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dlnode = nodes.definition_list()
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for section in doc.features.values():
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dlnode += self._make_dlitem(
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[nodes.literal('', section.member.name)], dedent(section.text))
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seen_item = True
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if not seen_item:
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return []
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section = self._make_section('Features')
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section += dlnode
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return [section]
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def _nodes_for_example(self, exampletext):
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"""Return list of doctree nodes for a code example snippet"""
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return [nodes.literal_block(exampletext, exampletext)]
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def _nodes_for_sections(self, doc):
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"""Return list of doctree nodes for additional sections"""
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nodelist = []
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for section in doc.sections:
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if section.tag and section.tag == 'TODO':
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# Hide TODO: sections
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continue
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if not section.tag:
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# Sphinx cannot handle sectionless titles;
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# Instead, just append the results to the prior section.
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container = nodes.container()
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self._parse_text_into_node(section.text, container)
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nodelist += container.children
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continue
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snode = self._make_section(section.tag)
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if section.tag.startswith('Example'):
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snode += self._nodes_for_example(dedent(section.text))
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else:
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self._parse_text_into_node(dedent(section.text), snode)
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nodelist.append(snode)
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return nodelist
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def _nodes_for_if_section(self, ifcond):
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"""Return list of doctree nodes for the "If" section"""
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nodelist = []
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if ifcond.is_present():
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snode = self._make_section('If')
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snode += nodes.paragraph(
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'', '', *self._nodes_for_ifcond(ifcond, with_if=False)
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)
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nodelist.append(snode)
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return nodelist
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def _add_doc(self, typ, sections):
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"""Add documentation for a command/object/enum...
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We assume we're documenting the thing defined in self._cur_doc.
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typ is the type of thing being added ("Command", "Object", etc)
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sections is a list of nodes for sections to add to the definition.
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"""
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doc = self._cur_doc
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snode = nodes.section(ids=[self._sphinx_directive.new_serialno()])
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snode += nodes.title('', '', *[nodes.literal(doc.symbol, doc.symbol),
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nodes.Text(' (' + typ + ')')])
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self._parse_text_into_node(doc.body.text, snode)
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for s in sections:
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if s is not None:
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snode += s
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self._add_node_to_current_heading(snode)
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def visit_enum_type(self, name, info, ifcond, features, members, prefix):
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doc = self._cur_doc
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self._add_doc('Enum',
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self._nodes_for_enum_values(doc)
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+ self._nodes_for_features(doc)
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+ self._nodes_for_sections(doc)
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+ self._nodes_for_if_section(ifcond))
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def visit_object_type(self, name, info, ifcond, features,
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base, members, branches):
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doc = self._cur_doc
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if base and base.is_implicit():
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base = None
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self._add_doc('Object',
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self._nodes_for_members(doc, 'Members', base, branches)
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+ self._nodes_for_features(doc)
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+ self._nodes_for_sections(doc)
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+ self._nodes_for_if_section(ifcond))
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def visit_alternate_type(self, name, info, ifcond, features,
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alternatives):
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doc = self._cur_doc
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self._add_doc('Alternate',
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self._nodes_for_members(doc, 'Members')
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+ self._nodes_for_features(doc)
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+ self._nodes_for_sections(doc)
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+ self._nodes_for_if_section(ifcond))
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def visit_command(self, name, info, ifcond, features, arg_type,
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ret_type, gen, success_response, boxed, allow_oob,
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allow_preconfig, coroutine):
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doc = self._cur_doc
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self._add_doc('Command',
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self._nodes_for_arguments(doc, arg_type)
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+ self._nodes_for_features(doc)
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+ self._nodes_for_sections(doc)
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+ self._nodes_for_if_section(ifcond))
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def visit_event(self, name, info, ifcond, features, arg_type, boxed):
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doc = self._cur_doc
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self._add_doc('Event',
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self._nodes_for_arguments(doc, arg_type)
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+ self._nodes_for_features(doc)
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+ self._nodes_for_sections(doc)
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+ self._nodes_for_if_section(ifcond))
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def symbol(self, doc, entity):
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"""Add documentation for one symbol to the document tree
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This is the main entry point which causes us to add documentation
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nodes for a symbol (which could be a 'command', 'object', 'event',
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etc). We do this by calling 'visit' on the schema entity, which
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will then call back into one of our visit_* methods, depending
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on what kind of thing this symbol is.
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"""
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self._cur_doc = doc
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entity.visit(self)
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self._cur_doc = None
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def _start_new_heading(self, heading, level):
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"""Start a new heading at the specified heading level
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Create a new section whose title is 'heading' and which is placed
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in the docutils node tree as a child of the most recent level-1
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heading. Subsequent document sections (commands, freeform doc chunks,
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etc) will be placed as children of this new heading section.
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"""
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if len(self._active_headings) < level:
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raise QAPISemError(self._cur_doc.info,
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'Level %d subheading found outside a '
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'level %d heading'
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% (level, level - 1))
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snode = self._make_section(heading)
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self._active_headings[level - 1] += snode
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self._active_headings = self._active_headings[:level]
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self._active_headings.append(snode)
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return snode
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def _add_node_to_current_heading(self, node):
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"""Add the node to whatever the current active heading is"""
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self._active_headings[-1] += node
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def freeform(self, doc):
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"""Add a piece of 'freeform' documentation to the document tree
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A 'freeform' document chunk doesn't relate to any particular
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symbol (for instance, it could be an introduction).
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If the freeform document starts with a line of the form
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'= Heading text', this is a section or subsection heading, with
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the heading level indicated by the number of '=' signs.
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"""
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# QAPIDoc documentation says free-form documentation blocks
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# must have only a body section, nothing else.
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assert not doc.sections
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assert not doc.args
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assert not doc.features
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self._cur_doc = doc
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text = doc.body.text
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if re.match(r'=+ ', text):
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# Section/subsection heading (if present, will always be
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# the first line of the block)
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(heading, _, text) = text.partition('\n')
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(leader, _, heading) = heading.partition(' ')
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node = self._start_new_heading(heading, len(leader))
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if text == '':
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return
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self._parse_text_into_node(text, node)
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self._cur_doc = None
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def _parse_text_into_node(self, doctext, node):
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"""Parse a chunk of QAPI-doc-format text into the node
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The doc comment can contain most inline rST markup, including
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bulleted and enumerated lists.
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As an extra permitted piece of markup, @var will be turned
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into ``var``.
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"""
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# Handle the "@var means ``var`` case
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doctext = re.sub(r'@([\w-]+)', r'``\1``', doctext)
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rstlist = ViewList()
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for line in doctext.splitlines():
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# The reported line number will always be that of the start line
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# of the doc comment, rather than the actual location of the error.
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# Being more precise would require overhaul of the QAPIDoc class
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# to track lines more exactly within all the sub-parts of the doc
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# comment, as well as counting lines here.
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rstlist.append(line, self._cur_doc.info.fname,
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self._cur_doc.info.line)
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# Append a blank line -- in some cases rST syntax errors get
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# attributed to the line after one with actual text, and if there
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# isn't anything in the ViewList corresponding to that then Sphinx
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# 1.6's AutodocReporter will then misidentify the source/line location
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# in the error message (usually attributing it to the top-level
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# .rst file rather than the offending .json file). The extra blank
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# line won't affect the rendered output.
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rstlist.append("", self._cur_doc.info.fname, self._cur_doc.info.line)
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self._sphinx_directive.do_parse(rstlist, node)
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def get_document_nodes(self):
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"""Return the list of docutils nodes which make up the document"""
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return self._top_node.children
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# Turn the black formatter on for the rest of the file.
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# fmt: on
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class QAPISchemaGenDepVisitor(QAPISchemaVisitor):
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"""A QAPI schema visitor which adds Sphinx dependencies each module
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This class calls the Sphinx note_dependency() function to tell Sphinx
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that the generated documentation output depends on the input
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schema file associated with each module in the QAPI input.
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"""
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def __init__(self, env, qapidir):
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self._env = env
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self._qapidir = qapidir
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def visit_module(self, name):
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if name != "./builtin":
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qapifile = self._qapidir + "/" + name
|
|
self._env.note_dependency(os.path.abspath(qapifile))
|
|
super().visit_module(name)
|
|
|
|
|
|
class NestedDirective(Directive):
|
|
def run(self):
|
|
raise NotImplementedError
|
|
|
|
def do_parse(self, rstlist, node):
|
|
"""
|
|
Parse rST source lines and add them to the specified node
|
|
|
|
Take the list of rST source lines rstlist, parse them as
|
|
rST, and add the resulting docutils nodes as children of node.
|
|
The nodes are parsed in a way that allows them to include
|
|
subheadings (titles) without confusing the rendering of
|
|
anything else.
|
|
"""
|
|
with switch_source_input(self.state, rstlist):
|
|
nested_parse_with_titles(self.state, rstlist, node)
|
|
|
|
|
|
class QAPIDocDirective(NestedDirective):
|
|
"""Extract documentation from the specified QAPI .json file"""
|
|
|
|
required_argument = 1
|
|
optional_arguments = 1
|
|
option_spec = {"qapifile": directives.unchanged_required}
|
|
has_content = False
|
|
|
|
def new_serialno(self):
|
|
"""Return a unique new ID string suitable for use as a node's ID"""
|
|
env = self.state.document.settings.env
|
|
return "qapidoc-%d" % env.new_serialno("qapidoc")
|
|
|
|
def run(self):
|
|
env = self.state.document.settings.env
|
|
qapifile = env.config.qapidoc_srctree + "/" + self.arguments[0]
|
|
qapidir = os.path.dirname(qapifile)
|
|
|
|
try:
|
|
schema = QAPISchema(qapifile)
|
|
|
|
# First tell Sphinx about all the schema files that the
|
|
# output documentation depends on (including 'qapifile' itself)
|
|
schema.visit(QAPISchemaGenDepVisitor(env, qapidir))
|
|
|
|
vis = QAPISchemaGenRSTVisitor(self)
|
|
vis.visit_begin(schema)
|
|
for doc in schema.docs:
|
|
if doc.symbol:
|
|
vis.symbol(doc, schema.lookup_entity(doc.symbol))
|
|
else:
|
|
vis.freeform(doc)
|
|
return vis.get_document_nodes()
|
|
except QAPIError as err:
|
|
# Launder QAPI parse errors into Sphinx extension errors
|
|
# so they are displayed nicely to the user
|
|
raise ExtensionError(str(err)) from err
|
|
|
|
|
|
class QMPExample(CodeBlock, NestedDirective):
|
|
"""
|
|
Custom admonition for QMP code examples.
|
|
|
|
When the :annotated: option is present, the body of this directive
|
|
is parsed as normal rST, but with any '::' code blocks set to use
|
|
the QMP lexer. Code blocks must be explicitly written by the user,
|
|
but this allows for intermingling explanatory paragraphs with
|
|
arbitrary rST syntax and code blocks for more involved examples.
|
|
|
|
When :annotated: is absent, the directive body is treated as a
|
|
simple standalone QMP code block literal.
|
|
"""
|
|
|
|
required_argument = 0
|
|
optional_arguments = 0
|
|
has_content = True
|
|
option_spec = {
|
|
"annotated": directives.flag,
|
|
"title": directives.unchanged,
|
|
}
|
|
|
|
def _highlightlang(self) -> addnodes.highlightlang:
|
|
"""Return the current highlightlang setting for the document"""
|
|
node = None
|
|
doc = self.state.document
|
|
|
|
if hasattr(doc, "findall"):
|
|
# docutils >= 0.18.1
|
|
for node in doc.findall(addnodes.highlightlang):
|
|
pass
|
|
else:
|
|
for elem in doc.traverse():
|
|
if isinstance(elem, addnodes.highlightlang):
|
|
node = elem
|
|
|
|
if node:
|
|
return node
|
|
|
|
# No explicit directive found, use defaults
|
|
node = addnodes.highlightlang(
|
|
lang=self.env.config.highlight_language,
|
|
force=False,
|
|
# Yes, Sphinx uses this value to effectively disable line
|
|
# numbers and not 0 or None or -1 or something. ¯\_(ツ)_/¯
|
|
linenothreshold=sys.maxsize,
|
|
)
|
|
return node
|
|
|
|
def admonition_wrap(self, *content) -> List[nodes.Node]:
|
|
title = "Example:"
|
|
if "title" in self.options:
|
|
title = f"{title} {self.options['title']}"
|
|
|
|
admon = nodes.admonition(
|
|
"",
|
|
nodes.title("", title),
|
|
*content,
|
|
classes=["admonition", "admonition-example"],
|
|
)
|
|
return [admon]
|
|
|
|
def run_annotated(self) -> List[nodes.Node]:
|
|
lang_node = self._highlightlang()
|
|
|
|
content_node: nodes.Element = nodes.section()
|
|
|
|
# Configure QMP highlighting for "::" blocks, if needed
|
|
if lang_node["lang"] != "QMP":
|
|
content_node += addnodes.highlightlang(
|
|
lang="QMP",
|
|
force=False, # "True" ignores lexing errors
|
|
linenothreshold=lang_node["linenothreshold"],
|
|
)
|
|
|
|
self.do_parse(self.content, content_node)
|
|
|
|
# Restore prior language highlighting, if needed
|
|
if lang_node["lang"] != "QMP":
|
|
content_node += addnodes.highlightlang(**lang_node.attributes)
|
|
|
|
return content_node.children
|
|
|
|
def run(self) -> List[nodes.Node]:
|
|
annotated = "annotated" in self.options
|
|
|
|
if annotated:
|
|
content_nodes = self.run_annotated()
|
|
else:
|
|
self.arguments = ["QMP"]
|
|
content_nodes = super().run()
|
|
|
|
return self.admonition_wrap(*content_nodes)
|
|
|
|
|
|
def setup(app):
|
|
"""Register qapi-doc directive with Sphinx"""
|
|
app.add_config_value("qapidoc_srctree", None, "env")
|
|
app.add_directive("qapi-doc", QAPIDocDirective)
|
|
app.add_directive("qmp-example", QMPExample)
|
|
|
|
return {
|
|
"version": __version__,
|
|
"parallel_read_safe": True,
|
|
"parallel_write_safe": True,
|
|
}
|