tools/net/ynl/ynl-gen-rst.py - linux/kernel/git/bpf/bpf - Git at Google

 #!/usr/bin/env python3
 # SPDX-License-Identifier: GPL-2.0
 # -*- coding: utf-8; mode: python -*-

 """
     Script to auto generate the documentation for Netlink specifications.

     :copyright:  Copyright (C) 2023  Breno Leitao <leitao@debian.org>
     :license:    GPL Version 2, June 1991 see linux/COPYING for details.

     This script performs extensive parsing to the Linux kernel's netlink YAML
     spec files, in an effort to avoid needing to heavily mark up the original
     YAML file.

     This code is split in three big parts:
         1) RST formatters: Use to convert a string to a RST output
         2) Parser helpers: Functions to parse the YAML data structure
         3) Main function and small helpers
 """

 from typing import Any, Dict, List
 import os.path
 import sys
 import argparse
 import logging
 import yaml


 SPACE_PER_LEVEL = 4


 # RST Formatters
 # ==============
 def headroom(level: int) -> str:
     """Return space to format"""
     return " " * (level * SPACE_PER_LEVEL)


 def bold(text: str) -> str:
     """Format bold text"""
     return f"**{text}**"


 def inline(text: str) -> str:
     """Format inline text"""
     return f"``{text}``"


 def sanitize(text: str) -> str:
     """Remove newlines and multiple spaces"""
     # This is useful for some fields that are spread across multiple lines
     return str(text).replace("\n", "").strip()


 def rst_fields(key: str, value: str, level: int = 0) -> str:
     """Return a RST formatted field"""
     return headroom(level) + f":{key}: {value}"


 def rst_definition(key: str, value: Any, level: int = 0) -> str:
     """Format a single rst definition"""
     return headroom(level) + key + "\n" + headroom(level + 1) + str(value)


 def rst_paragraph(paragraph: str, level: int = 0) -> str:
     """Return a formatted paragraph"""
     return headroom(level) + paragraph


 def rst_bullet(item: str, level: int = 0) -> str:
     """Return a formatted a bullet"""
     return headroom(level) + f"- {item}"


 def rst_subsection(title: str) -> str:
     """Add a sub-section to the document"""
     return f"{title}\n" + "-" * len(title)


 def rst_subsubsection(title: str) -> str:
     """Add a sub-sub-section to the document"""
     return f"{title}\n" + "~" * len(title)


 def rst_section(title: str) -> str:
     """Add a section to the document"""
     return f"\n{title}\n" + "=" * len(title)


 def rst_subtitle(title: str) -> str:
     """Add a subtitle to the document"""
     return "\n" + "-" * len(title) + f"\n{title}\n" + "-" * len(title) + "\n\n"


 def rst_title(title: str) -> str:
     """Add a title to the document"""
     return "=" * len(title) + f"\n{title}\n" + "=" * len(title) + "\n\n"


 def rst_list_inline(list_: List[str], level: int = 0) -> str:
     """Format a list using inlines"""
     return headroom(level) + "[" + ", ".join(inline(i) for i in list_) + "]"


 def rst_header() -> str:
     """The headers for all the auto generated RST files"""
     lines = []

     lines.append(rst_paragraph(".. SPDX-License-Identifier: GPL-2.0"))
     lines.append(rst_paragraph(".. NOTE: This document was auto-generated.\n\n"))

     return "\n".join(lines)


 def rst_toctree(maxdepth: int = 2) -> str:
     """Generate a toctree RST primitive"""
     lines = []

     lines.append(".. toctree::")
     lines.append(f"   :maxdepth: {maxdepth}\n\n")

     return "\n".join(lines)


 def rst_label(title: str) -> str:
     """Return a formatted label"""
     return f".. _{title}:\n\n"


 # Parsers
 # =======


 def parse_mcast_group(mcast_group: List[Dict[str, Any]]) -> str:
     """Parse 'multicast' group list and return a formatted string"""
     lines = []
     for group in mcast_group:
         lines.append(rst_bullet(group["name"]))

     return "\n".join(lines)


 def parse_do(do_dict: Dict[str, Any], level: int = 0) -> str:
     """Parse 'do' section and return a formatted string"""
     lines = []
     for key in do_dict.keys():
         lines.append(rst_paragraph(bold(key), level + 1))
         lines.append(parse_do_attributes(do_dict[key], level + 1) + "\n")

     return "\n".join(lines)


 def parse_do_attributes(attrs: Dict[str, Any], level: int = 0) -> str:
     """Parse 'attributes' section"""
     if "attributes" not in attrs:
         return ""
     lines = [rst_fields("attributes", rst_list_inline(attrs["attributes"]), level + 1)]

     return "\n".join(lines)


 def parse_operations(operations: List[Dict[str, Any]]) -> str:
     """Parse operations block"""
     preprocessed = ["name", "doc", "title", "do", "dump"]
     lines = []

     for operation in operations:
         lines.append(rst_section(operation["name"]))
         lines.append(rst_paragraph(sanitize(operation["doc"])) + "\n")

         for key in operation.keys():
             if key in preprocessed:
                 # Skip the special fields
                 continue
             lines.append(rst_fields(key, operation[key], 0))

         if "do" in operation:
             lines.append(rst_paragraph(":do:", 0))
             lines.append(parse_do(operation["do"], 0))
         if "dump" in operation:
             lines.append(rst_paragraph(":dump:", 0))
             lines.append(parse_do(operation["dump"], 0))

         # New line after fields
         lines.append("\n")

     return "\n".join(lines)


 def parse_entries(entries: List[Dict[str, Any]], level: int) -> str:
     """Parse a list of entries"""
     ignored = ["pad"]
     lines = []
     for entry in entries:
         if isinstance(entry, dict):
             # entries could be a list or a dictionary
             field_name = entry.get("name", "")
             if field_name in ignored:
                 continue
             type_ = entry.get("type")
             if type_:
                 field_name += f" ({inline(type_)})"
             lines.append(
                 rst_fields(field_name, sanitize(entry.get("doc", "")), level)
             )
         elif isinstance(entry, list):
             lines.append(rst_list_inline(entry, level))
         else:
             lines.append(rst_bullet(inline(sanitize(entry)), level))

     lines.append("\n")
     return "\n".join(lines)


 def parse_definitions(defs: Dict[str, Any]) -> str:
     """Parse definitions section"""
     preprocessed = ["name", "entries", "members"]
     ignored = ["render-max"]  # This is not printed
     lines = []

     for definition in defs:
         lines.append(rst_section(definition["name"]))
         for k in definition.keys():
             if k in preprocessed + ignored:
                 continue
             lines.append(rst_fields(k, sanitize(definition[k]), 0))

         # Field list needs to finish with a new line
         lines.append("\n")
         if "entries" in definition:
             lines.append(rst_paragraph(":entries:", 0))
             lines.append(parse_entries(definition["entries"], 1))
         if "members" in definition:
             lines.append(rst_paragraph(":members:", 0))
             lines.append(parse_entries(definition["members"], 1))

     return "\n".join(lines)


 def parse_attr_sets(entries: List[Dict[str, Any]]) -> str:
     """Parse attribute from attribute-set"""
     preprocessed = ["name", "type"]
     ignored = ["checks"]
     lines = []

     for entry in entries:
         lines.append(rst_section(entry["name"]))
         for attr in entry["attributes"]:
             type_ = attr.get("type")
             attr_line = attr["name"]
             if type_:
                 # Add the attribute type in the same line
                 attr_line += f" ({inline(type_)})"

             lines.append(rst_subsubsection(attr_line))

             for k in attr.keys():
                 if k in preprocessed + ignored:
                     continue
                 lines.append(rst_fields(k, sanitize(attr[k]), 0))
             lines.append("\n")

     return "\n".join(lines)


 def parse_sub_messages(entries: List[Dict[str, Any]]) -> str:
     """Parse sub-message definitions"""
     lines = []

     for entry in entries:
         lines.append(rst_section(entry["name"]))
         for fmt in entry["formats"]:
             value = fmt["value"]

             lines.append(rst_bullet(bold(value)))
             for attr in ['fixed-header', 'attribute-set']:
                 if attr in fmt:
                     lines.append(rst_fields(attr, fmt[attr], 1))
             lines.append("\n")

     return "\n".join(lines)


 def parse_yaml(obj: Dict[str, Any]) -> str:
     """Format the whole YAML into a RST string"""
     lines = []

     # Main header

     lines.append(rst_header())

     title = f"Family ``{obj['name']}`` netlink specification"
     lines.append(rst_title(title))
     lines.append(rst_paragraph(".. contents::\n"))

     if "doc" in obj:
         lines.append(rst_subtitle("Summary"))
         lines.append(rst_paragraph(obj["doc"], 0))

     # Operations
     if "operations" in obj:
         lines.append(rst_subtitle("Operations"))
         lines.append(parse_operations(obj["operations"]["list"]))

     # Multicast groups
     if "mcast-groups" in obj:
         lines.append(rst_subtitle("Multicast groups"))
         lines.append(parse_mcast_group(obj["mcast-groups"]["list"]))

     # Definitions
     if "definitions" in obj:
         lines.append(rst_subtitle("Definitions"))
         lines.append(parse_definitions(obj["definitions"]))

     # Attributes set
     if "attribute-sets" in obj:
         lines.append(rst_subtitle("Attribute sets"))
         lines.append(parse_attr_sets(obj["attribute-sets"]))

     # Sub-messages
     if "sub-messages" in obj:
         lines.append(rst_subtitle("Sub-messages"))
         lines.append(parse_sub_messages(obj["sub-messages"]))

     return "\n".join(lines)


 # Main functions
 # ==============


 def parse_arguments() -> argparse.Namespace:
     """Parse arguments from user"""
     parser = argparse.ArgumentParser(description="Netlink RST generator")

     parser.add_argument("-v", "--verbose", action="store_true")
     parser.add_argument("-o", "--output", help="Output file name")

     # Index and input are mutually exclusive
     group = parser.add_mutually_exclusive_group()
     group.add_argument(
         "-x", "--index", action="store_true", help="Generate the index page"
     )
     group.add_argument("-i", "--input", help="YAML file name")

     args = parser.parse_args()

     if args.verbose:
         logging.basicConfig(level=logging.DEBUG)

     if args.input and not os.path.isfile(args.input):
         logging.warning("%s is not a valid file.", args.input)
         sys.exit(-1)

     if not args.output:
         logging.error("No output file specified.")
         sys.exit(-1)

     if os.path.isfile(args.output):
         logging.debug("%s already exists. Overwriting it.", args.output)

     return args


 def parse_yaml_file(filename: str) -> str:
     """Transform the YAML specified by filename into a rst-formmated string"""
     with open(filename, "r", encoding="utf-8") as spec_file:
         yaml_data = yaml.safe_load(spec_file)
         content = parse_yaml(yaml_data)

     return content


 def write_to_rstfile(content: str, filename: str) -> None:
     """Write the generated content into an RST file"""
     logging.debug("Saving RST file to %s", filename)

     with open(filename, "w", encoding="utf-8") as rst_file:
         rst_file.write(content)


 def generate_main_index_rst(output: str) -> None:
     """Generate the `networking_spec/index` content and write to the file"""
     lines = []

     lines.append(rst_header())
     lines.append(rst_label("specs"))
     lines.append(rst_title("Netlink Family Specifications"))
     lines.append(rst_toctree(1))

     index_dir = os.path.dirname(output)
     logging.debug("Looking for .rst files in %s", index_dir)
     for filename in sorted(os.listdir(index_dir)):
         if not filename.endswith(".rst") or filename == "index.rst":
             continue
         lines.append(f"   {filename.replace('.rst', '')}\n")

     logging.debug("Writing an index file at %s", output)
     write_to_rstfile("".join(lines), output)


 def main() -> None:
     """Main function that reads the YAML files and generates the RST files"""

     args = parse_arguments()

     if args.input:
         logging.debug("Parsing %s", args.input)
         try:
             content = parse_yaml_file(os.path.join(args.input))
         except Exception as exception:
             logging.warning("Failed to parse %s.", args.input)
             logging.warning(exception)
             sys.exit(-1)

         write_to_rstfile(content, args.output)

     if args.index:
         # Generate the index RST file
         generate_main_index_rst(args.output)


 if __name__ == "__main__":
     main()
	#!/usr/bin/env python3
	# SPDX-License-Identifier: GPL-2.0
	# -- coding: utf-8; mode: python --

	"""
	Script to auto generate the documentation for Netlink specifications.

	:copyright: Copyright (C) 2023 Breno Leitao <leitao@debian.org>
	:license: GPL Version 2, June 1991 see linux/COPYING for details.

	This script performs extensive parsing to the Linux kernel's netlink YAML
	spec files, in an effort to avoid needing to heavily mark up the original
	YAML file.

	This code is split in three big parts:
	1) RST formatters: Use to convert a string to a RST output
	2) Parser helpers: Functions to parse the YAML data structure
	3) Main function and small helpers
	"""

	from typing import Any, Dict, List
	import os.path
	import sys
	import argparse
	import logging
	import yaml


	SPACE_PER_LEVEL = 4


	# RST Formatters
	# ==============
	def headroom(level: int) -> str:
	"""Return space to format"""
	return " " * (level * SPACE_PER_LEVEL)


	def bold(text: str) -> str:
	"""Format bold text"""
	return f"{text}"


	def inline(text: str) -> str:
	"""Format inline text"""
	return f"``{text}``"


	def sanitize(text: str) -> str:
	"""Remove newlines and multiple spaces"""
	# This is useful for some fields that are spread across multiple lines
	return str(text).replace("\n", "").strip()


	def rst_fields(key: str, value: str, level: int = 0) -> str:
	"""Return a RST formatted field"""
	return headroom(level) + f":{key}: {value}"


	def rst_definition(key: str, value: Any, level: int = 0) -> str:
	"""Format a single rst definition"""
	return headroom(level) + key + "\n" + headroom(level + 1) + str(value)


	def rst_paragraph(paragraph: str, level: int = 0) -> str:
	"""Return a formatted paragraph"""
	return headroom(level) + paragraph


	def rst_bullet(item: str, level: int = 0) -> str:
	"""Return a formatted a bullet"""
	return headroom(level) + f"- {item}"


	def rst_subsection(title: str) -> str:
	"""Add a sub-section to the document"""
	return f"{title}\n" + "-" * len(title)


	def rst_subsubsection(title: str) -> str:
	"""Add a sub-sub-section to the document"""
	return f"{title}\n" + "~" * len(title)


	def rst_section(title: str) -> str:
	"""Add a section to the document"""
	return f"\n{title}\n" + "=" * len(title)


	def rst_subtitle(title: str) -> str:
	"""Add a subtitle to the document"""
	return "\n" + "-" * len(title) + f"\n{title}\n" + "-" * len(title) + "\n\n"


	def rst_title(title: str) -> str:
	"""Add a title to the document"""
	return "=" * len(title) + f"\n{title}\n" + "=" * len(title) + "\n\n"


	def rst_list_inline(list_: List[str], level: int = 0) -> str:
	"""Format a list using inlines"""
	return headroom(level) + "[" + ", ".join(inline(i) for i in list_) + "]"


	def rst_header() -> str:
	"""The headers for all the auto generated RST files"""
	lines = []

	lines.append(rst_paragraph(".. SPDX-License-Identifier: GPL-2.0"))
	lines.append(rst_paragraph(".. NOTE: This document was auto-generated.\n\n"))

	return "\n".join(lines)


	def rst_toctree(maxdepth: int = 2) -> str:
	"""Generate a toctree RST primitive"""
	lines = []

	lines.append(".. toctree::")
	lines.append(f" :maxdepth: {maxdepth}\n\n")

	return "\n".join(lines)


	def rst_label(title: str) -> str:
	"""Return a formatted label"""
	return f".. _{title}:\n\n"


	# Parsers
	# =======


	def parse_mcast_group(mcast_group: List[Dict[str, Any]]) -> str:
	"""Parse 'multicast' group list and return a formatted string"""
	lines = []
	for group in mcast_group:
	lines.append(rst_bullet(group["name"]))

	return "\n".join(lines)


	def parse_do(do_dict: Dict[str, Any], level: int = 0) -> str:
	"""Parse 'do' section and return a formatted string"""
	lines = []
	for key in do_dict.keys():
	lines.append(rst_paragraph(bold(key), level + 1))
	lines.append(parse_do_attributes(do_dict[key], level + 1) + "\n")

	return "\n".join(lines)


	def parse_do_attributes(attrs: Dict[str, Any], level: int = 0) -> str:
	"""Parse 'attributes' section"""
	if "attributes" not in attrs:
	return ""
	lines = [rst_fields("attributes", rst_list_inline(attrs["attributes"]), level + 1)]

	return "\n".join(lines)


	def parse_operations(operations: List[Dict[str, Any]]) -> str:
	"""Parse operations block"""
	preprocessed = ["name", "doc", "title", "do", "dump"]
	lines = []

	for operation in operations:
	lines.append(rst_section(operation["name"]))
	lines.append(rst_paragraph(sanitize(operation["doc"])) + "\n")

	for key in operation.keys():
	if key in preprocessed:
	# Skip the special fields
	continue
	lines.append(rst_fields(key, operation[key], 0))

	if "do" in operation:
	lines.append(rst_paragraph(":do:", 0))
	lines.append(parse_do(operation["do"], 0))
	if "dump" in operation:
	lines.append(rst_paragraph(":dump:", 0))
	lines.append(parse_do(operation["dump"], 0))

	# New line after fields
	lines.append("\n")

	return "\n".join(lines)


	def parse_entries(entries: List[Dict[str, Any]], level: int) -> str:
	"""Parse a list of entries"""
	ignored = ["pad"]
	lines = []
	for entry in entries:
	if isinstance(entry, dict):
	# entries could be a list or a dictionary
	field_name = entry.get("name", "")
	if field_name in ignored:
	continue
	type_ = entry.get("type")
	if type_:
	field_name += f" ({inline(type_)})"
	lines.append(
	rst_fields(field_name, sanitize(entry.get("doc", "")), level)
	)
	elif isinstance(entry, list):
	lines.append(rst_list_inline(entry, level))
	else:
	lines.append(rst_bullet(inline(sanitize(entry)), level))

	lines.append("\n")
	return "\n".join(lines)


	def parse_definitions(defs: Dict[str, Any]) -> str:
	"""Parse definitions section"""
	preprocessed = ["name", "entries", "members"]
	ignored = ["render-max"] # This is not printed
	lines = []

	for definition in defs:
	lines.append(rst_section(definition["name"]))
	for k in definition.keys():
	if k in preprocessed + ignored:
	continue
	lines.append(rst_fields(k, sanitize(definition[k]), 0))

	# Field list needs to finish with a new line
	lines.append("\n")
	if "entries" in definition:
	lines.append(rst_paragraph(":entries:", 0))
	lines.append(parse_entries(definition["entries"], 1))
	if "members" in definition:
	lines.append(rst_paragraph(":members:", 0))
	lines.append(parse_entries(definition["members"], 1))

	return "\n".join(lines)


	def parse_attr_sets(entries: List[Dict[str, Any]]) -> str:
	"""Parse attribute from attribute-set"""
	preprocessed = ["name", "type"]
	ignored = ["checks"]
	lines = []

	for entry in entries:
	lines.append(rst_section(entry["name"]))
	for attr in entry["attributes"]:
	type_ = attr.get("type")
	attr_line = attr["name"]
	if type_:
	# Add the attribute type in the same line
	attr_line += f" ({inline(type_)})"

	lines.append(rst_subsubsection(attr_line))

	for k in attr.keys():
	if k in preprocessed + ignored:
	continue
	lines.append(rst_fields(k, sanitize(attr[k]), 0))
	lines.append("\n")

	return "\n".join(lines)


	def parse_sub_messages(entries: List[Dict[str, Any]]) -> str:
	"""Parse sub-message definitions"""
	lines = []

	for entry in entries:
	lines.append(rst_section(entry["name"]))
	for fmt in entry["formats"]:
	value = fmt["value"]

	lines.append(rst_bullet(bold(value)))
	for attr in ['fixed-header', 'attribute-set']:
	if attr in fmt:
	lines.append(rst_fields(attr, fmt[attr], 1))
	lines.append("\n")

	return "\n".join(lines)


	def parse_yaml(obj: Dict[str, Any]) -> str:
	"""Format the whole YAML into a RST string"""
	lines = []

	# Main header

	lines.append(rst_header())

	title = f"Family ``{obj['name']}`` netlink specification"
	lines.append(rst_title(title))
	lines.append(rst_paragraph(".. contents::\n"))

	if "doc" in obj:
	lines.append(rst_subtitle("Summary"))
	lines.append(rst_paragraph(obj["doc"], 0))

	# Operations
	if "operations" in obj:
	lines.append(rst_subtitle("Operations"))
	lines.append(parse_operations(obj["operations"]["list"]))

	# Multicast groups
	if "mcast-groups" in obj:
	lines.append(rst_subtitle("Multicast groups"))
	lines.append(parse_mcast_group(obj["mcast-groups"]["list"]))

	# Definitions
	if "definitions" in obj:
	lines.append(rst_subtitle("Definitions"))
	lines.append(parse_definitions(obj["definitions"]))

	# Attributes set
	if "attribute-sets" in obj:
	lines.append(rst_subtitle("Attribute sets"))
	lines.append(parse_attr_sets(obj["attribute-sets"]))

	# Sub-messages
	if "sub-messages" in obj:
	lines.append(rst_subtitle("Sub-messages"))
	lines.append(parse_sub_messages(obj["sub-messages"]))

	return "\n".join(lines)


	# Main functions
	# ==============


	def parse_arguments() -> argparse.Namespace:
	"""Parse arguments from user"""
	parser = argparse.ArgumentParser(description="Netlink RST generator")

	parser.add_argument("-v", "--verbose", action="store_true")
	parser.add_argument("-o", "--output", help="Output file name")

	# Index and input are mutually exclusive
	group = parser.add_mutually_exclusive_group()
	group.add_argument(
	"-x", "--index", action="store_true", help="Generate the index page"
	)
	group.add_argument("-i", "--input", help="YAML file name")

	args = parser.parse_args()

	if args.verbose:
	logging.basicConfig(level=logging.DEBUG)

	if args.input and not os.path.isfile(args.input):
	logging.warning("%s is not a valid file.", args.input)
	sys.exit(-1)

	if not args.output:
	logging.error("No output file specified.")
	sys.exit(-1)

	if os.path.isfile(args.output):
	logging.debug("%s already exists. Overwriting it.", args.output)

	return args


	def parse_yaml_file(filename: str) -> str:
	"""Transform the YAML specified by filename into a rst-formmated string"""
	with open(filename, "r", encoding="utf-8") as spec_file:
	yaml_data = yaml.safe_load(spec_file)
	content = parse_yaml(yaml_data)

	return content


	def write_to_rstfile(content: str, filename: str) -> None:
	"""Write the generated content into an RST file"""
	logging.debug("Saving RST file to %s", filename)

	with open(filename, "w", encoding="utf-8") as rst_file:
	rst_file.write(content)


	def generate_main_index_rst(output: str) -> None:
	"""Generate the `networking_spec/index` content and write to the file"""
	lines = []

	lines.append(rst_header())
	lines.append(rst_label("specs"))
	lines.append(rst_title("Netlink Family Specifications"))
	lines.append(rst_toctree(1))

	index_dir = os.path.dirname(output)
	logging.debug("Looking for .rst files in %s", index_dir)
	for filename in sorted(os.listdir(index_dir)):
	if not filename.endswith(".rst") or filename == "index.rst":
	continue
	lines.append(f" {filename.replace('.rst', '')}\n")

	logging.debug("Writing an index file at %s", output)
	write_to_rstfile("".join(lines), output)


	def main() -> None:
	"""Main function that reads the YAML files and generates the RST files"""

	args = parse_arguments()

	if args.input:
	logging.debug("Parsing %s", args.input)
	try:
	content = parse_yaml_file(os.path.join(args.input))
	except Exception as exception:
	logging.warning("Failed to parse %s.", args.input)
	logging.warning(exception)
	sys.exit(-1)

	write_to_rstfile(content, args.output)

	if args.index:
	# Generate the index RST file
	generate_main_index_rst(args.output)


	if __name__ == "__main__":
	main()