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# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at
import os
import re
import signal
import subprocess
import sys
import xml.etree.ElementTree as ET
from mozboot.util import get_tools_dir
from mozlint import result
from mozlint.pathutils import expand_exclusions
Could not find clang-format! It should've been installed automatically - \
please report a bug here:
def setup(root, mach_command_context, **lintargs):
if get_clang_format_binary():
return 0
from mozbuild.code_analysis.mach_commands import get_clang_tools
rc, _ = get_clang_tools(mach_command_context)
if rc:
return 1
def run_process(config, cmd):
orig = signal.signal(signal.SIGINT, signal.SIG_IGN)
proc = subprocess.Popen(
cmd, stdout=subprocess.PIPE, stderr=subprocess.STDOUT, text=True
signal.signal(signal.SIGINT, orig)
output, _ = proc.communicate()
except KeyboardInterrupt:
return output
def get_clang_format_binary():
Returns the path of the first clang-format binary available
if not found returns None
binary = os.environ.get("CLANG_FORMAT")
if binary:
return binary
clang_tools_path = os.path.join(get_tools_dir(), "clang-tools")
bin_path = os.path.join(clang_tools_path, "clang-tidy", "bin")
binary = os.path.join(bin_path, "clang-format")
if sys.platform.startswith("win"):
binary += ".exe"
if not os.path.isfile(binary):
return None
return binary
def is_ignored_path(ignored_dir_re, topsrcdir, f):
# Remove up to topsrcdir in pathname and match
if f.startswith(topsrcdir + "/"):
match_f = f[len(topsrcdir + "/") :]
match_f = f
return re.match(ignored_dir_re, match_f)
def remove_ignored_path(paths, topsrcdir, log):
path_to_third_party = os.path.join(topsrcdir, ".clang-format-ignore")
ignored_dir = []
with open(path_to_third_party, "r") as fh:
for l in fh:
# In case it starts with a space
line = l.strip()
# Remove comments and empty lines
if line.startswith("#") or len(line) == 0:
# The regexp is to make sure we are managing relative paths
ignored_dir.append(r"^[\./]*" + line.rstrip())
# Generates the list of regexp
ignored_dir_re = "(%s)" % "|".join(ignored_dir)
path_list = []
for f in paths:
if is_ignored_path(ignored_dir_re, topsrcdir, f):
# Early exit if we have provided an ignored directory
log.debug("Ignored third party code '{0}'".format(f))
return path_list
def lint(paths, config, fix=None, **lintargs):
log = lintargs["log"]
paths = list(expand_exclusions(paths, config, lintargs["root"]))
# We ignored some specific files for a bunch of reasons.
# Not using excluding to avoid duplication
if lintargs.get("use_filters", True):
paths = remove_ignored_path(paths, lintargs["root"], log)
# An empty path array can occur when the user passes in `-n`. If we don't
# return early in this case, rustfmt will attempt to read stdin and hang.
if not paths:
return []
binary = get_clang_format_binary()
if not binary:
if "MOZ_AUTOMATION" in os.environ:
return 1
return []
cmd_args = [binary]
base_command = cmd_args + ["--version"]
version = run_process(config, base_command).rstrip("\r\n")
log.debug("Version: {}".format(version))
base_command = cmd_args + paths
log.debug("Command: {}".format(" ".join(cmd_args)))
output = run_process(config, base_command)
def replacement(parser):
for end, e in parser.read_events():
assert end == "end"
if e.tag == "replacement":
item = {k: int(v) for k, v in e.items()}
assert sorted(item.keys()) == ["length", "offset"]
item["with"] = (e.text or "").encode("utf-8")
yield item
# When given multiple paths as input, --output-replacements-xml
# will output one xml per path, in the order they are given, but
# XML parsers don't know how to handle that, so do it manually.
parser = None
replacements = []
for l in output.split("\n"):
line = l.rstrip("\r\n")
if line.startswith("<?xml "):
if parser:
parser = ET.XMLPullParser(["end"])
results = []
fixed = 0
for path, replacement in zip(paths, replacements):
if not replacement:
with open(path, "rb") as fh:
data =
linenos = []
patched_data = b""
last_offset = 0
lineno_before = 1
lineno_after = 1
for item in replacement:
offset = item["offset"]
length = item["length"]
replace_with = item["with"]
since_last_offset = data[last_offset:offset]
replaced = data[offset : offset + length]
lines_since_last_offset = since_last_offset.count(b"\n")
lineno_before += lines_since_last_offset
lineno_after += lines_since_last_offset
start_lineno = (lineno_before, lineno_after)
lineno_before += replaced.count(b"\n")
lineno_after += replace_with.count(b"\n")
end_lineno = (lineno_before, lineno_after)
if linenos and start_lineno[0] <= linenos[-1][1][0]:
linenos[-1] = (linenos[-1][0], end_lineno)
linenos.append((start_lineno, end_lineno))
patched_data += since_last_offset + replace_with
last_offset = offset + len(replaced)
patched_data += data[last_offset:]
lines_before = data.decode("utf-8", "replace").splitlines()
lines_after = patched_data.decode("utf-8", "replace").splitlines()
for (start_before, start_after), (end_before, end_after) in linenos:
diff = "".join(
"-" + l + "\n" for l in lines_before[start_before - 1 : end_before]
diff += "".join(
"+" + l + "\n" for l in lines_after[start_after - 1 : end_after]
if fix:
with open(path, "wb") as fh:
fixed += len(linenos)
return {"results": results, "fixed": fixed}