# -*- Mode: python; c-basic-offset: 4; indent-tabs-mode: nil; tab-width: 40 -*- # vim: set filetype=python: # 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 http://mozilla.org/MPL/2.0/.
import re import sys
import yaml from mozlint import result from mozlint.pathutils import expand_exclusions
# This simple linter checks for duplicates from # modules/libpref/init/StaticPrefList.yaml against modules/libpref/init/all.js
# If for any reason a pref needs to appear in both files, add it to this set.
IGNORE_PREFS = { "devtools.console.stdout.chrome", # Uses the 'sticky' attribute. "devtools.console.stdout.content", # Uses the 'sticky' attribute. "fission.autostart", # Uses the 'locked' attribute. "browser.dom.window.dump.enabled", # Uses the 'sticky' attribute. "apz.fling_curve_function_y2", # This pref is a part of a series. "dom.postMessage.sharedArrayBuffer.bypassCOOP_COEP.insecure.enabled", # NOQA: E501; Uses the 'locked' attribute. "extensions.backgroundServiceWorkerEnabled.enabled", # NOQA: E501; Uses the 'locked' attribute.
}
PATTERN = re.compile(r"\s*pref\(\s*\"(?P<pref>.+)\"\s*,\s*(?P.+)\)\s*;.*")
def get_names(pref_list_filename):
pref_names = {} # We want to transform patterns like 'foo: @VAR@' into valid yaml. This # pattern does not happen in 'name', so it's fine to ignore these. # We also want to evaluate all branches of #ifdefs for pref names, so we # ignore anything else preprocessor related.
file = open(pref_list_filename, encoding="utf-8").read().replace("@", "") try:
pref_list = yaml.safe_load(file) except (IOError, ValueError) as e:
print("{}: error:\n {}".format(pref_list_filename, e), file=sys.stderr)
sys.exit(1)
for pref in pref_list: if pref["name"] notin IGNORE_PREFS:
pref_names[pref["name"]] = pref["value"]
return pref_names
# Check the names of prefs against each other, and if the pref is a duplicate # that has not previously been noted, add that name to the list of errors. def check_against(path, pref_names):
errors = []
prefs = read_prefs(path) for pref in prefs: if pref["name"] in pref_names:
errors.extend(check_value_for_pref(pref, pref_names[pref["name"]], path)) return errors
def check_value_for_pref(some_pref, some_value, path):
errors = [] if some_pref["value"] == some_value:
errors.append(
{ "path": path, "message": some_pref["raw"], "lineno": some_pref["line"], "hint": "Remove the duplicate pref or add it to IGNORE_PREFS.", "level": "error",
}
) return errors
# The entries in the *.js pref files are regular enough to use simple pattern # matching to load in prefs. def read_prefs(path):
prefs = [] with open(path, encoding="utf-8") as source: for lineno, line in enumerate(source, start=1):
match = PATTERN.match(line) if match:
prefs.append(
{ "name": match.group("pref"), "value": evaluate_pref(match.group("val")), "line": lineno, "raw": line,
}
) return prefs
def evaluate_pref(value):
bools = {"true": True, "false": False} if value in bools: return bools[value] elif value.isdigit(): return int(value) return value
def checkdupes(paths, config, **kwargs):
results = []
errors = []
pref_names = get_names(config["support-files"][0])
files = list(expand_exclusions(paths, config, kwargs["root"])) for file in files:
errors.extend(check_against(file, pref_names)) for error in errors:
results.append(result.from_config(config, **error)) return results
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