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authorDavid Robillard <d@drobilla.net>2020-12-20 20:20:07 +0100
committerDavid Robillard <d@drobilla.net>2020-12-21 09:48:06 +0100
commitf95f22013d51133ec1a7b1554878ff354b9f0f21 (patch)
tree2f65c78412fa9a083bc82e49480ba206fa14a689 /scripts/dox_to_sphinx.py
parentfabf7113483ffd70024df989de3aa9361146d60c (diff)
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Generate documentation with Sphinx
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+#!/usr/bin/env python3
+
+# Copyright 2020 David Robillard <d@drobilla.net>
+#
+# Permission to use, copy, modify, and/or distribute this software for any
+# purpose with or without fee is hereby granted, provided that the above
+# copyright notice and this permission notice appear in all copies.
+#
+# THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+"""
+Write Sphinx markup from Doxygen XML.
+
+Takes a path to a directory of XML generated by Doxygen, and emits a directory
+with a reStructuredText file for every documented symbol.
+"""
+
+import argparse
+import os
+import sys
+import textwrap
+import xml.etree.ElementTree
+
+__author__ = "David Robillard"
+__date__ = "2020-11-18"
+__email__ = "d@drobilla.net"
+__license__ = "ISC"
+__version__ = __date__.replace("-", ".")
+
+
+def load_index(index_path):
+ """
+ Load the index from XML.
+
+ :returns: A dictionary from ID to skeleton records with basic information
+ for every documented entity. Some records have an ``xml_filename`` key
+ with the filename of a definition file. These files will be loaded later
+ to flesh out the records in the index.
+ """
+
+ root = xml.etree.ElementTree.parse(index_path).getroot()
+ index = {}
+
+ for compound in root:
+ compound_id = compound.get("refid")
+ compound_kind = compound.get("kind")
+ compound_name = compound.find("name").text
+ if compound_kind in ["dir", "file", "page"]:
+ continue
+
+ # Add record for compound (compounds appear only once in the index)
+ assert compound_id not in index
+ index[compound_id] = {
+ "kind": compound_kind,
+ "name": compound_name,
+ "xml_filename": compound_id + ".xml",
+ "children": [],
+ }
+
+ name_prefix = (
+ ("%s::" % compound_name) if compound_kind == "namespace" else ""
+ )
+
+ for child in compound.findall("member"):
+ if child.get("refid") in index:
+ assert compound_kind == "group"
+ continue
+
+ # Everything has a kind and a name
+ child_record = {
+ "kind": child.get("kind"),
+ "name": name_prefix + child.find("name").text,
+ }
+
+ if child.get("kind") == "enum":
+ # Enums are not compounds, but we want to resolve the parent of
+ # their values so they are not written as top level documents
+ child_record["children"] = []
+
+ if child.get("kind") == "enumvalue":
+ # Remove namespace prefix
+ child_record["name"] = child.find("name").text
+
+ index[child.get("refid")] = child_record
+
+ return index
+
+
+def resolve_index(index, root):
+ """
+ Walk a definition document and extend the index for linking.
+
+ This does two things: sets the "parent" and "children" fields of all
+ applicable records, and sets the "strong" field of enums so that the
+ correct Sphinx role can be used when referring to them.
+ """
+
+ def add_child(index, parent_id, child_id):
+ parent = index[parent_id]
+ child = index[child_id]
+
+ if child["kind"] == "enumvalue":
+ assert parent["kind"] == "enum"
+ assert "parent" not in child or child["parent"] == parent_id
+ child["parent"] = parent_id
+
+ else:
+ if parent["kind"] in ["class", "struct", "union"]:
+ assert "parent" not in child or child["parent"] == parent_id
+ child["parent"] = parent_id
+
+ if child_id not in parent["children"]:
+ parent["children"] += [child_id]
+
+ compound = root.find("compounddef")
+ compound_kind = compound.get("kind")
+
+ if compound_kind == "group":
+ for subgroup in compound.findall("innergroup"):
+ add_child(index, compound.get("id"), subgroup.get("refid"))
+
+ for klass in compound.findall("innerclass"):
+ add_child(index, compound.get("id"), klass.get("refid"))
+
+ for section in compound.findall("sectiondef"):
+ if section.get("kind").startswith("private"):
+ for member in section.findall("memberdef"):
+ if member.get("id") in index:
+ del index[member.get("id")]
+ else:
+ for member in section.findall("memberdef"):
+ member_id = member.get("id")
+ add_child(index, compound.get("id"), member_id)
+
+ if member.get("kind") == "enum":
+ index[member_id]["strong"] = member.get("strong") == "yes"
+ for value in member.findall("enumvalue"):
+ add_child(index, member_id, value.get("id"))
+
+
+def sphinx_role(record, lang):
+ """
+ Return the Sphinx role used for a record.
+
+ This is used for the description directive like ".. c:function::", and
+ links like ":c:func:`foo`.
+ """
+
+ kind = record["kind"]
+
+ if kind in ["class", "function", "namespace", "struct", "union"]:
+ return lang + ":" + kind
+
+ if kind == "define":
+ return "c:macro"
+
+ if kind == "enum":
+ return lang + (":enum-class" if record["strong"] else ":enum")
+
+ if kind == "typedef":
+ return lang + ":type"
+
+ if kind == "enumvalue":
+ return lang + ":enumerator"
+
+ if kind == "variable":
+ return lang + (":member" if "parent" in record else ":var")
+
+ raise RuntimeError("No known role for kind '%s'" % kind)
+
+
+def child_identifier(lang, parent_name, child_name):
+ """
+ Return the identifier for an enum value or struct member.
+
+ Sphinx, for some reason, uses a different syntax for this in C and C++.
+ """
+
+ separator = "::" if lang == "cpp" else "."
+
+ return "%s%s%s" % (parent_name, separator, child_name)
+
+
+def link_markup(index, lang, refid):
+ """Return a Sphinx link for a Doxygen reference."""
+
+ record = index[refid]
+ kind, name = record["kind"], record["name"]
+ role = sphinx_role(record, lang)
+
+ if kind in ["class", "enum", "struct", "typedef", "union"]:
+ return ":%s:`%s`" % (role, name)
+
+ if kind == "function":
+ return ":%s:func:`%s`" % (lang, name)
+
+ if kind == "enumvalue":
+ parent_name = index[record["parent"]]["name"]
+ return ":%s:`%s`" % (role, child_identifier(lang, parent_name, name))
+
+ if kind == "variable":
+ if "parent" not in record:
+ return ":%s:var:`%s`" % (lang, name)
+
+ parent_name = index[record["parent"]]["name"]
+ return ":%s:`%s`" % (role, child_identifier(lang, parent_name, name))
+
+ raise RuntimeError("Unknown link target kind: %s" % kind)
+
+
+def indent(markup, depth):
+ """
+ Indent markup to a depth level.
+
+ Like textwrap.indent() but takes an integer and works in reST indentation
+ levels for clarity."
+ """
+
+ return textwrap.indent(markup, " " * depth)
+
+
+def heading(text, level):
+ """
+ Return a ReST heading at a given level.
+
+ Follows the style in the Python documentation guide, see
+ <https://devguide.python.org/documenting/#sections>.
+ """
+
+ assert 1 <= level <= 6
+
+ chars = ("#", "*", "=", "-", "^", '"')
+ line = chars[level] * len(text)
+
+ return "%s\n%s\n%s\n\n" % (line if level < 3 else "", text, line)
+
+
+def dox_to_rst(index, lang, node):
+ """
+ Convert documentation commands (docCmdGroup) to Sphinx markup.
+
+ This is used to convert the content of descriptions in the documentation.
+ It recursively parses all children tags and raises a RuntimeError if any
+ unknown tag is encountered.
+ """
+
+ def field_value(markup):
+ """Return a value for a field as a single line or indented block."""
+ if "\n" in markup.strip():
+ return "\n" + indent(markup, 1)
+
+ return " " + markup.strip()
+
+ if node.tag == "computeroutput":
+ # assert len(node) == 0 FIXME
+ return "``%s``" % node.text
+
+ if node.tag == "itemizedlist":
+ markup = ""
+ for item in node.findall("listitem"):
+ assert len(item) == 1
+ markup += "\n- %s" % dox_to_rst(index, lang, item[0])
+
+ return markup
+
+ if node.tag == "para":
+ markup = node.text if node.text is not None else ""
+ for child in node:
+ markup += dox_to_rst(index, lang, child)
+ markup += child.tail if child.tail is not None else ""
+
+ return markup.strip() + "\n\n"
+
+ if node.tag == "parameterlist":
+ markup = ""
+ for item in node.findall("parameteritem"):
+ name = item.find("parameternamelist/parametername")
+ description = item.find("parameterdescription")
+ assert len(description) == 1
+ markup += "\n\n:param %s:%s" % (
+ name.text,
+ field_value(dox_to_rst(index, lang, description[0])),
+ )
+
+ return markup + "\n"
+
+ if node.tag == "programlisting":
+ return "\n.. code-block:: %s\n\n%s" % (
+ lang,
+ indent(plain_text(node), 1),
+ )
+
+ if node.tag == "ref":
+ refid = node.get("refid")
+ if refid not in index:
+ sys.stderr.write("warning: Unresolved link: %s\n" % refid)
+ return node.text
+
+ assert len(node) == 0
+ assert len(link_markup(index, lang, refid)) > 0
+ return link_markup(index, lang, refid)
+
+ if node.tag == "simplesect":
+ assert len(node) == 1
+
+ if node.get("kind") == "return":
+ return "\n:returns:" + field_value(
+ dox_to_rst(index, lang, node[0])
+ )
+
+ if node.get("kind") == "see":
+ return dox_to_rst(index, lang, node[0])
+
+ raise RuntimeError("Unknown simplesect kind: %s" % node.get("kind"))
+
+ if node.tag == "ulink":
+ return "`%s <%s>`_" % (node.text, node.get("url"))
+
+ raise RuntimeError("Unknown documentation command: %s" % node.tag)
+
+
+def description_markup(index, lang, node):
+ """Return the markup for a brief or detailed description."""
+
+ assert node.tag == "briefdescription" or node.tag == "detaileddescription"
+ assert not (node.tag == "briefdescription" and len(node) > 1)
+ assert len(node.text.strip()) == 0
+
+ return "".join([dox_to_rst(index, lang, child) for child in node])
+
+
+def set_descriptions(index, lang, definition, record):
+ """Set a record's brief/detailed descriptions from the XML definition."""
+
+ for tag in ["briefdescription", "detaileddescription"]:
+ node = definition.find(tag)
+ if node is not None:
+ record[tag] = description_markup(index, lang, node)
+
+
+def set_template_params(node, record):
+ """Set a record's template_params from the XML definition."""
+
+ template_param_list = node.find("templateparamlist")
+ if template_param_list is not None:
+ params = []
+ for param in template_param_list.findall("param"):
+ if param.find("declname") is not None:
+ # Value parameter
+ type_text = plain_text(param.find("type"))
+ name_text = plain_text(param.find("declname"))
+
+ params += ["%s %s" % (type_text, name_text)]
+ else:
+ # Type parameter
+ params += ["%s" % (plain_text(param.find("type")))]
+
+ record["template_params"] = "%s" % ", ".join(params)
+
+
+def plain_text(node):
+ """
+ Return the plain text of a node with all tags ignored.
+
+ This is needed where Doxygen may include refs but Sphinx needs plain text
+ because it parses things itself to generate links.
+ """
+
+ if node.tag == "sp":
+ markup = " "
+ elif node.text is not None:
+ markup = node.text
+ else:
+ markup = ""
+
+ for child in node:
+ markup += plain_text(child)
+ markup += child.tail if child.tail is not None else ""
+
+ return markup
+
+
+def local_name(name):
+ """Return a name with all namespace prefixes stripped."""
+
+ return name[name.rindex("::") + 2 :] if "::" in name else name
+
+
+def read_definition_doc(index, lang, root):
+ """Walk a definition document and update described records in the index."""
+
+ # Set descriptions for the compound itself
+ compound = root.find("compounddef")
+ compound_record = index[compound.get("id")]
+ set_descriptions(index, lang, compound, compound_record)
+ set_template_params(compound, compound_record)
+
+ if compound.find("title") is not None:
+ compound_record["title"] = compound.find("title").text.strip()
+
+ # Set documentation for all children
+ for section in compound.findall("sectiondef"):
+ if section.get("kind").startswith("private"):
+ continue
+
+ for member in section.findall("memberdef"):
+ kind = member.get("kind")
+ record = index[member.get("id")]
+ set_descriptions(index, lang, member, record)
+ set_template_params(member, record)
+
+ if compound.get("kind") in ["class", "struct", "union"]:
+ assert kind in ["function", "typedef", "variable"]
+ record["type"] = plain_text(member.find("type"))
+
+ if kind == "enum":
+ for value in member.findall("enumvalue"):
+ set_descriptions(
+ index, lang, value, index[value.get("id")]
+ )
+
+ elif kind == "function":
+ record["prototype"] = "%s %s%s" % (
+ plain_text(member.find("type")),
+ member.find("name").text,
+ member.find("argsstring").text,
+ )
+
+ elif kind == "typedef":
+ name = local_name(record["name"])
+ args_text = member.find("argsstring").text
+ target_text = plain_text(member.find("type"))
+ if args_text is not None: # Function pointer
+ assert target_text[-2:] == "(*" and args_text[0] == ")"
+ record["type"] = target_text + args_text
+ record["definition"] = target_text + name + args_text
+ else: # Normal named typedef
+ assert target_text is not None
+ record["type"] = target_text
+ if member.find("definition").text.startswith("using"):
+ record["definition"] = "%s = %s" % (
+ name,
+ target_text,
+ )
+ else:
+ record["definition"] = "%s %s" % (
+ target_text,
+ name,
+ )
+
+ elif kind == "variable":
+ record["definition"] = member.find("definition").text
+
+
+def declaration_string(record):
+ """
+ Return the string that describes a declaration.
+
+ This is what follows the directive, and is in C/C++ syntax, except without
+ keywords like "typedef" and "using" as expected by Sphinx. For example,
+ "struct ThingImpl Thing" or "void run(int value)".
+ """
+
+ kind = record["kind"]
+ result = ""
+
+ if "template_params" in record:
+ result = "template <%s> " % record["template_params"]
+
+ if kind == "function":
+ result += record["prototype"]
+ elif kind == "typedef":
+ result += record["definition"]
+ elif kind == "variable":
+ if "parent" in record:
+ result += "%s %s" % (record["type"], local_name(record["name"]))
+ else:
+ result += record["definition"]
+ elif "type" in record:
+ result += "%s %s" % (record["type"], local_name(record["name"]))
+ else:
+ result += local_name(record["name"])
+
+ return result
+
+
+def document_markup(index, lang, record):
+ """Return the complete document that describes some documented entity."""
+
+ kind = record["kind"]
+ role = sphinx_role(record, lang)
+ name = record["name"]
+ markup = ""
+
+ if name != local_name(name):
+ markup += ".. cpp:namespace:: %s\n\n" % name[0 : name.rindex("::")]
+
+ # Write top-level directive
+ markup += ".. %s:: %s\n" % (role, declaration_string(record))
+
+ # Write main description blurb
+ markup += "\n"
+ markup += indent(record["briefdescription"], 1)
+ markup += indent(record["detaileddescription"], 1)
+
+ assert (
+ kind in ["class", "enum", "namespace", "struct", "union"]
+ or "children" not in record
+ )
+
+ # Sphinx C++ namespaces work by setting a scope, they have no content
+ child_indent = 0 if kind == "namespace" else 1
+
+ # Write inline children if applicable
+ markup += "\n"
+ for child_id in record.get("children", []):
+ child_record = index[child_id]
+ child_role = sphinx_role(child_record, lang)
+
+ child_header = ".. %s:: %s\n\n" % (
+ child_role,
+ declaration_string(child_record),
+ )
+
+ markup += "\n"
+ markup += indent(child_header, child_indent)
+ markup += indent(child_record["briefdescription"], child_indent + 1)
+ markup += indent(child_record["detaileddescription"], child_indent + 1)
+ markup += "\n"
+
+ return markup
+
+
+def symbol_filename(name):
+ """Adapt the name of a symbol to be suitable for use as a filename."""
+
+ return name.replace("::", "__")
+
+
+def emit_symbols(index, lang, symbol_dir, force):
+ """Write a description file for every symbol documented in the index."""
+
+ for record in index.values():
+ if (
+ record["kind"] in ["group", "namespace"]
+ or "parent" in record
+ and index[record["parent"]]["kind"] != "group"
+ ):
+ continue
+
+ name = record["name"]
+ filename = os.path.join(symbol_dir, symbol_filename("%s.rst" % name))
+ if not force and os.path.exists(filename):
+ raise FileExistsError("File already exists: '%s'" % filename)
+
+ with open(filename, "w") as rst:
+ rst.write(heading(local_name(name), 3))
+ rst.write(document_markup(index, lang, record))
+
+
+def emit_groups(index, output_dir, symbol_dir_name, force):
+ """Write a description file for every group documented in the index."""
+
+ for record in index.values():
+ if record["kind"] != "group":
+ continue
+
+ name = record["name"]
+ filename = os.path.join(output_dir, "%s.rst" % name)
+ if not force and os.path.exists(filename):
+ raise FileExistsError("File already exists: '%s'" % filename)
+
+ with open(filename, "w") as rst:
+ rst.write(heading(record["title"], 2))
+
+ # Get all child group and symbol names
+ group_names = []
+ symbol_names = []
+ for child_id in record["children"]:
+ child = index[child_id]
+ if child["kind"] == "group":
+ group_names += [child["name"]]
+ else:
+ symbol_names += [child["name"]]
+
+ # Emit description (document body)
+ rst.write(record["briefdescription"] + "\n\n")
+ rst.write(record["detaileddescription"] + "\n\n")
+
+ # Emit TOC
+ rst.write(".. toctree::\n")
+
+ # Emit groups at the top of the TOC
+ for group_name in group_names:
+ rst.write("\n" + indent(group_name, 1))
+
+ # Emit symbols in sorted order
+ for symbol_name in sorted(symbol_names):
+ path = "/".join(
+ [symbol_dir_name, symbol_filename(symbol_name)]
+ )
+ rst.write("\n" + indent(path, 1))
+
+ rst.write("\n")
+
+
+def run(index_xml_path, output_dir, symbol_dir_name, language, force):
+ """Write a directory of Sphinx files from a Doxygen XML directory."""
+
+ # Build skeleton index from index.xml
+ xml_dir = os.path.dirname(index_xml_path)
+ index = load_index(index_xml_path)
+
+ # Load all definition documents
+ definition_docs = []
+ for record in index.values():
+ if "xml_filename" in record:
+ xml_path = os.path.join(xml_dir, record["xml_filename"])
+ definition_docs += [xml.etree.ElementTree.parse(xml_path)]
+
+ # Do an initial pass of the definition documents to resolve the index
+ for root in definition_docs:
+ resolve_index(index, root)
+
+ # Finally read the documentation from definition documents
+ for root in definition_docs:
+ read_definition_doc(index, language, root)
+
+ # Emit output files
+ symbol_dir = os.path.join(output_dir, symbol_dir_name)
+ os.makedirs(symbol_dir, exist_ok=True)
+ emit_symbols(index, language, symbol_dir, force)
+ emit_groups(index, output_dir, symbol_dir_name, force)
+
+
+if __name__ == "__main__":
+ ap = argparse.ArgumentParser(
+ usage="%(prog)s [OPTION]... XML_DIR OUTPUT_DIR",
+ description=__doc__,
+ formatter_class=argparse.RawDescriptionHelpFormatter,
+ )
+
+ ap.add_argument(
+ "-f",
+ "--force",
+ action="store_true",
+ help="overwrite files",
+ )
+
+ ap.add_argument(
+ "-l",
+ "--language",
+ default="c",
+ choices=["c", "cpp"],
+ help="language domain for output",
+ )
+
+ ap.add_argument(
+ "-s",
+ "--symbol-dir-name",
+ default="symbols",
+ help="name for subdirectory of symbol documentation files",
+ )
+
+ ap.add_argument("index_xml_path", help="path index.xml from Doxygen")
+ ap.add_argument("output_dir", help="output directory")
+
+ run(**vars(ap.parse_args(sys.argv[1:])))