mirror of
https://gitlab.torproject.org/tpo/core/tor.git
synced 2024-11-28 06:13:31 +01:00
252 lines
7.1 KiB
Python
Executable File
252 lines
7.1 KiB
Python
Executable File
#!/usr/bin/env python3
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"""
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Add a C file with matching header to the Tor codebase. Creates
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both files from templates, and adds them to the right include.am file.
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Example usage:
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% add_c_file.py ./src/feature/dirauth/ocelot.c
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"""
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import os
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import re
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import time
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def topdir_file(name):
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"""Strip opening "src" from a filename"""
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if name.startswith("src/"):
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name = name[4:]
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return name
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def guard_macro(name):
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"""Return the guard macro that should be used for the header file 'name'.
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"""
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td = topdir_file(name).replace(".", "_").replace("/", "_").upper()
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return "TOR_{}".format(td)
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def makeext(name, new_extension):
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"""Replace the extension for the file called 'name' with 'new_extension'.
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"""
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base = os.path.splitext(name)[0]
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return base + "." + new_extension
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def instantiate_template(template, output_fname):
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"""
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Fill in a template with string using the fields that should be used
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for 'output_fname'.
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"""
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names = {
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# The relative location of the header file.
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'header_path' : makeext(topdir_file(output_fname), "h"),
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# The relative location of the C file file.
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'c_file_path' : makeext(topdir_file(output_fname), "c"),
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# The truncated name of the file.
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'short_name' : os.path.basename(output_fname),
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# The current year, for the copyright notice
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'this_year' : time.localtime().tm_year,
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# An appropriate guard macro, for the header.
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'guard_macro' : guard_macro(output_fname),
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}
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return template.format(**names)
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HEADER_TEMPLATE = """\
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/* Copyright (c) 2001 Matej Pfajfar.
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* Copyright (c) 2001-2004, Roger Dingledine.
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* Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
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* Copyright (c) 2007-{this_year}, The Tor Project, Inc. */
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/* See LICENSE for licensing information */
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/**
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* @file {short_name}
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* @brief Header for {c_file_path}
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**/
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#ifndef {guard_macro}
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#define {guard_macro}
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#endif /* !defined({guard_macro}) */
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"""
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C_FILE_TEMPLATE = """\
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/* Copyright (c) 2001 Matej Pfajfar.
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* Copyright (c) 2001-2004, Roger Dingledine.
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* Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
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* Copyright (c) 2007-{this_year}, The Tor Project, Inc. */
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/* See LICENSE for licensing information */
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/**
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* @file {short_name}
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* @brief DOCDOC
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**/
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#include "orconfig.h"
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#include "{header_path}"
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"""
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class AutomakeChunk:
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"""
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Represents part of an automake file. If it is decorated with
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an ADD_C_FILE comment, it has a "kind" based on what to add to it.
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Otherwise, it only has a bunch of lines in it.
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"""
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pat = re.compile(r'# ADD_C_FILE: INSERT (\S*) HERE', re.I)
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def __init__(self):
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self.lines = []
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self.kind = ""
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def addLine(self, line):
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"""
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Insert a line into this chunk while parsing the automake file.
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"""
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m = self.pat.match(line)
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if m:
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if self.lines:
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raise ValueError("control line not preceded by a blank line")
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self.kind = m.group(1)
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self.lines.append(line)
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if line.strip() == "":
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return True
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return False
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def insertMember(self, member):
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"""
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Add a new member to this chunk. Try to insert it in alphabetical
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order with matching indentation, but don't freak out too much if the
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source isn't consistent.
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Assumes that this chunk is of the form:
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FOOBAR = \
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X \
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Y \
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Z
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"""
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self.prespace = "\t"
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self.postspace = "\t\t"
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for lineno, line in enumerate(self.lines):
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m = re.match(r'(\s+)(\S+)(\s+)\\', line)
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if not m:
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continue
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prespace, fname, postspace = m.groups()
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if fname > member:
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self.insert_before(lineno, member, prespace, postspace)
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return
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self.insert_at_end(member)
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def insert_before(self, lineno, member, prespace, postspace):
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self.lines.insert(lineno,
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"{}{}{}\\\n".format(prespace, member, postspace))
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def insert_at_end(self, member, prespace, postspace):
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lastline = self.lines[-1]
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self.lines[-1] += '{}\\\n'.format(postspace)
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self.lines.append("{}{}\n".format(prespace, member))
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def dump(self, f):
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"""Write all the lines in this chunk to the file 'f'."""
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for line in self.lines:
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f.write(line)
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if not line.endswith("\n"):
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f.write("\n")
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class ParsedAutomake:
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"""A sort-of-parsed automake file, with identified chunks into which
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headers and c files can be inserted.
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"""
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def __init__(self):
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self.chunks = []
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self.by_type = {}
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def addChunk(self, chunk):
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"""Add a newly parsed AutomakeChunk to this file."""
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self.chunks.append(chunk)
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self.by_type[chunk.kind.lower()] = chunk
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def add_file(self, fname, kind):
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"""Insert a file of kind 'kind' to the appropriate section of this
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file. Return True if we added it.
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"""
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if kind.lower() in self.by_type:
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self.by_type[kind.lower()].insertMember(fname)
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return True
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else:
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return False
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def dump(self, f):
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"""Write this file into a file 'f'."""
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for chunk in self.chunks:
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chunk.dump(f)
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def get_include_am_location(fname):
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"""Find the right include.am file for introducing a new file. Return None
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if we can't guess one.
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Note that this function is imperfect because our include.am layout is
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not (yet) consistent.
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"""
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td = topdir_file(fname)
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m = re.match(r'^lib/([a-z0-9_]*)/', td)
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if m:
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return "src/lib/{}/include.am".format(m.group(1))
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if re.match(r'^(core|feature|app)/', td):
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return "src/core/include.am"
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if re.match(r'^test/', td):
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return "src/test/include.am"
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return None
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def run(fn):
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"""
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Create a new C file and H file corresponding to the filename "fn", and
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add them to include.am.
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"""
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cf = makeext(fn, "c")
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hf = makeext(fn, "h")
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if os.path.exists(cf):
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print("{} already exists".format(cf))
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return 1
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if os.path.exists(hf):
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print("{} already exists".format(hf))
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return 1
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with open(cf, 'w') as f:
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f.write(instantiate_template(C_FILE_TEMPLATE, cf))
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with open(hf, 'w') as f:
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f.write(instantiate_template(HEADER_TEMPLATE, hf))
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iam = get_include_am_location(cf)
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if iam is None or not os.path.exists(iam):
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print("Made files successfully but couldn't identify include.am for {}"
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.format(cf))
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return 1
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amfile = ParsedAutomake()
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cur_chunk = AutomakeChunk()
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with open(iam) as f:
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for line in f:
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if cur_chunk.addLine(line):
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amfile.addChunk(cur_chunk)
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cur_chunk = AutomakeChunk()
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amfile.addChunk(cur_chunk)
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amfile.add_file(cf, "sources")
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amfile.add_file(hf, "headers")
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with open(iam+".tmp", 'w') as f:
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amfile.dump(f)
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os.rename(iam+".tmp", iam)
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if __name__ == '__main__':
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import sys
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sys.exit(run(sys.argv[1]))
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