c375f05ef5
Pylint advises:
docs/sphinx/qapidoc.py:518:12: W0707: Consider explicitly re-raising using 'raise ExtensionError(str(err)) from err' (raise-missing-from)
>From its manual:
Python's exception chaining shows the traceback of the current
exception, but also of the original exception. When you raise a
new exception after another exception was caught it's likely that
the second exception is a friendly re-wrapping of the first
exception. In such cases `raise from` provides a better link
between the two tracebacks in the final error.
Makes sense, so do it.
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-ID: <20231025092159.1782638-2-armbru@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
558 lines
22 KiB
Python
558 lines
22 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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from docutils import nodes
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from docutils.statemachine import ViewList
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from docutils.parsers.rst import directives, Directive
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from sphinx.errors import ExtensionError
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from sphinx.util.nodes import nested_parse_with_titles
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import sphinx
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from qapi.gen import QAPISchemaVisitor
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from qapi.error import QAPIError, QAPISemError
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from qapi.schema import QAPISchema
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# Sphinx up to 1.6 uses AutodocReporter; 1.7 and later
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# use switch_source_input. Check borrowed from kerneldoc.py.
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Use_SSI = sphinx.__version__[:3] >= '1.7'
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if Use_SSI:
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from sphinx.util.docutils import switch_source_input
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else:
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from sphinx.ext.autodoc import AutodocReporter
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__version__ = '1.0'
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# Function borrowed from pydash, which is under the MIT license
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def intersperse(iterable, separator):
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"""Yield the members of *iterable* interspersed with *separator*."""
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iterable = iter(iterable)
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yield next(iterable)
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for item in iterable:
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yield separator
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yield item
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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, variants, 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 'variants' part of a definition list.
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"""
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term = [nodes.Text(' when '),
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nodes.literal('', variants.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, variants=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 = section.text
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elif (variants and variants.tag_member == section.member
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and not section.member.type.doc_type()):
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values = section.member.type.member_names()
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defn = [nodes.Text('One of ')]
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defn.extend(intersperse([nodes.literal('', v) for v in values],
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nodes.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 variants:
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for v in variants.variants:
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if v.type.is_implicit():
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assert not v.type.base and not v.type.variants
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for m in v.type.local_members:
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term = self._nodes_for_one_member(m)
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term.extend(self._nodes_for_variant_when(variants, v))
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dlnode += self._make_dlitem(term, None)
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else:
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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(variants, 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 = 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, boxed_arg_type):
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"""Return list of doctree nodes for the arguments section"""
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if boxed_arg_type:
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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('', boxed_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([nodes.literal('', section.name)],
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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.name and section.name == 'TODO':
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# Hide TODO: sections
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continue
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snode = self._make_section(section.name)
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if section.name and section.name.startswith('Example'):
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snode += self._nodes_for_example(section.text)
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else:
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self._parse_text_into_node(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, variants):
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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, variants)
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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, variants):
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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,
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arg_type if boxed else None)
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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,
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arg_type if boxed else None)
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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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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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self._start_new_heading(heading, len(leader))
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if text == '':
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return
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node = self._make_section(None)
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self._parse_text_into_node(text, node)
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self._add_node_to_current_heading(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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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
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self._env.note_dependency(os.path.abspath(qapifile))
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super().visit_module(name)
|
|
|
|
|
|
class QAPIDocDirective(Directive):
|
|
"""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
|
|
|
|
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.
|
|
"""
|
|
# This is from kerneldoc.py -- it works around an API change in
|
|
# Sphinx between 1.6 and 1.7. Unlike kerneldoc.py, we use
|
|
# sphinx.util.nodes.nested_parse_with_titles() rather than the
|
|
# plain self.state.nested_parse(), and so we can drop the saving
|
|
# of title_styles and section_level that kerneldoc.py does,
|
|
# because nested_parse_with_titles() does that for us.
|
|
if Use_SSI:
|
|
with switch_source_input(self.state, rstlist):
|
|
nested_parse_with_titles(self.state, rstlist, node)
|
|
else:
|
|
save = self.state.memo.reporter
|
|
self.state.memo.reporter = AutodocReporter(
|
|
rstlist, self.state.memo.reporter)
|
|
try:
|
|
nested_parse_with_titles(self.state, rstlist, node)
|
|
finally:
|
|
self.state.memo.reporter = save
|
|
|
|
|
|
def setup(app):
|
|
""" Register qapi-doc directive with Sphinx"""
|
|
app.add_config_value('qapidoc_srctree', None, 'env')
|
|
app.add_directive('qapi-doc', QAPIDocDirective)
|
|
|
|
return dict(
|
|
version=__version__,
|
|
parallel_read_safe=True,
|
|
parallel_write_safe=True
|
|
)
|