gen_std.py
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#!/usr/bin/env python
#===- gen_std.py - ------------------------------------------*- python -*--===#
#
# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
# See https://llvm.org/LICENSE.txt for license information.
# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
#
#===------------------------------------------------------------------------===#
"""gen_std.py is a tool to generate a lookup table (from qualified names to
include headers) for C/C++ Standard Library symbols by parsing archieved HTML
files from cppreference.
Caveats and FIXMEs:
- only symbols directly in "std" namespace are added, we should also add std's
subnamespace symbols (e.g. chrono).
- symbols with multiple variants or defined in multiple headers aren't added,
e.g. std::move, std::swap
Usage:
1. Install BeautifulSoup dependency, see instruction:
https://www.crummy.com/software/BeautifulSoup/bs4/doc/#installing-beautiful-soup
2. Download cppreference offline HTML files (e.g. html_book_20181028.zip) at
https://en.cppreference.com/w/Cppreference:Archives
3. Unzip the zip file from step 2 to directory </cppreference>, you should
get a "reference" directory in </cppreference>
4. Run the command:
// Generate C++ symbols
gen_std.py -cppreference </cppreference/reference> -language=cpp > StdSymbolMap.inc
// Generate C symbols
gen_std.py -cppreference </cppreference/reference> -language=c > CSymbolMap.inc
"""
import cppreference_parser
import argparse
import datetime
import os
import sys
CODE_PREFIX = """\
//===-- gen_std.py generated file -------------------------------*- C++ -*-===//
//
// Used to build a lookup table (qualified names => include headers) for %s
// Standard Library symbols.
//
// Automatically generated file, DO NOT EDIT!
//
// Generated from cppreference offline HTML book (modified on %s).
//===----------------------------------------------------------------------===//
"""
def ParseArg():
parser = argparse.ArgumentParser(description='Generate StdGen file')
parser.add_argument('-cppreference', metavar='PATH',
default='',
help='path to the cppreference offline HTML directory',
required=True
)
parser.add_argument('-language',
default='cpp',
help='Generate c or cpp symbols',
required=True)
return parser.parse_args()
def main():
args = ParseArg()
if args.language == 'cpp':
page_root = os.path.join(args.cppreference, "en", "cpp")
symbol_index_root = os.path.join(page_root, "symbol_index")
parse_pages = [
(page_root, "symbol_index.html", "std::"),
# std sub-namespace symbols have separated pages.
# We don't index std literal operators (e.g.
# std::literals::chrono_literals::operator""d), these symbols can't be
# accessed by std::<symbol_name>.
# FIXME: index std::placeholders symbols, placeholders.html page is
# different (which contains one entry for _1, _2, ..., _N), we need special
# handling.
(symbol_index_root, "chrono.html", "std::chrono::"),
(symbol_index_root, "filesystem.html", "std::filesystem::"),
(symbol_index_root, "pmr.html", "std::pmr::"),
(symbol_index_root, "regex_constants.html", "std::regex_constants::"),
(symbol_index_root, "this_thread.html", "std::this_thread::"),
]
elif args.language == 'c':
page_root = os.path.join(args.cppreference, "en", "c")
symbol_index_root = page_root
parse_pages = [(page_root, "index.html", None)]
if not os.path.exists(symbol_index_root):
exit("Path %s doesn't exist!" % symbol_index_root)
symbols = cppreference_parser.GetSymbols(parse_pages)
# We don't have version information from the unzipped offline HTML files.
# so we use the modified time of the symbol_index.html as the version.
index_page_path = os.path.join(page_root, "index.html")
cppreference_modified_date = datetime.datetime.fromtimestamp(
os.stat(index_page_path).st_mtime).strftime('%Y-%m-%d')
print CODE_PREFIX % (args.language.upper(), cppreference_modified_date)
for symbol in symbols:
if len(symbol.headers) == 1:
# SYMBOL(unqualified_name, namespace, header)
print "SYMBOL(%s, %s, %s)" % (symbol.name, symbol.namespace,
symbol.headers[0])
elif len(symbol.headers) == 0:
sys.stderr.write("No header found for symbol %s\n" % symbol.name)
else:
# FIXME: support symbols with multiple headers (e.g. std::move).
sys.stderr.write("Ambiguous header for symbol %s: %s\n" % (
symbol.name, ', '.join(symbol.headers)))
if __name__ == '__main__':
main()