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fune/servo/python/tidy/servo_tidy/tidy.py
Zbynek Winkler 30fc93bdf2 servo: Merge #10786 - tidy check for vim and emacs modelines (from zwn:tidy-modelines); r=Manishearth 
See #10719.

It skips *.webidl files for now since I am not sure where they come from and if they should be edited in tree or not.

Source-Repo: https://github.com/servo/servo
Source-Revision: 04f8ae56db0ba9df798b39a5b2f1bb1e23d6dcf3
2016-04-22 21:46:30 -07:00

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# Copyright 2013 The Servo Project Developers. See the COPYRIGHT
# file at the top-level directory of this distribution.
#
# Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
# http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
# <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
# option. This file may not be copied, modified, or distributed
# except according to those terms.
import contextlib
import fnmatch
import itertools
import json
import os
import re
import site
import StringIO
import subprocess
import sys
from licenseck import licenses
# File patterns to include in the non-WPT tidy check.
file_patterns_to_check = ["*.rs", "*.rc", "*.cpp", "*.c",
"*.h", "Cargo.lock", "*.py",
"*.toml", "*.webidl", "*.json"]
# File patterns that are ignored for all tidy and lint checks.
file_patterns_to_ignore = [
"*.#*",
"*.pyc",
]
# Files that are ignored for all tidy and lint checks.
ignored_files = [
# Generated and upstream code combined with our own. Could use cleanup
os.path.join(".", "ports", "gonk", "src", "native_window_glue.cpp"),
os.path.join(".", "ports", "geckolib", "bindings.rs"),
os.path.join(".", "ports", "geckolib", "gecko_style_structs.rs"),
os.path.join(".", "resources", "hsts_preload.json"),
os.path.join(".", "tests", "wpt", "metadata", "MANIFEST.json"),
os.path.join(".", "tests", "wpt", "metadata-css", "MANIFEST.json"),
os.path.join(".", "components", "script", "dom", "webidls", "ForceTouchEvent.webidl"),
# Hidden files
os.path.join(".", "."),
]
# Directories that are ignored for the non-WPT tidy check.
ignored_dirs = [
# Upstream
os.path.join(".", "support", "android", "apk"),
os.path.join(".", "support", "rust-task_info"),
os.path.join(".", "tests", "wpt", "css-tests"),
os.path.join(".", "tests", "wpt", "harness"),
os.path.join(".", "tests", "wpt", "update"),
os.path.join(".", "tests", "wpt", "web-platform-tests"),
os.path.join(".", "tests", "wpt", "sync"),
os.path.join(".", "tests", "wpt", "sync_css"),
os.path.join(".", "python", "mach"),
os.path.join(".", "python", "tidy", "servo_tidy_tests"),
os.path.join(".", "components", "script", "dom", "bindings", "codegen", "parser"),
os.path.join(".", "components", "script", "dom", "bindings", "codegen", "ply"),
os.path.join(".", "python", "_virtualenv"),
# Generated and upstream code combined with our own. Could use cleanup
os.path.join(".", "target"),
os.path.join(".", "ports", "cef"),
# Tooling, generated locally from external repos.
os.path.join(".", "ports", "geckolib", "tools"),
# Hidden directories
os.path.join(".", "."),
]
spec_base_path = "components/script/dom/"
def is_iter_empty(iterator):
try:
obj = iterator.next()
return True, itertools.chain((obj,), iterator)
except StopIteration:
return False, iterator
# A simple wrapper for iterators to show progress (note that it's inefficient for giant iterators)
def progress_wrapper(iterator):
list_of_stuff = list(iterator)
total_files, progress = len(list_of_stuff), 0
for idx, thing in enumerate(list_of_stuff):
progress = int(float(idx + 1) / total_files * 100)
sys.stdout.write('\r Progress: %s%% (%d/%d)' % (progress, idx + 1, total_files))
sys.stdout.flush()
yield thing
def filter_file(file_name):
if any(file_name.startswith(ignored_file) for ignored_file in ignored_files):
return False
base_name = os.path.basename(file_name)
if any(fnmatch.fnmatch(base_name, pattern) for pattern in file_patterns_to_ignore):
return False
return True
def filter_files(start_dir, faster, progress):
file_iter = get_file_list(start_dir, faster, ignored_dirs)
(has_element, file_iter) = is_iter_empty(file_iter)
if not has_element:
raise StopIteration
if progress:
file_iter = progress_wrapper(file_iter)
for file_name in file_iter:
base_name = os.path.basename(file_name)
if not any(fnmatch.fnmatch(base_name, pattern) for pattern in file_patterns_to_check):
continue
if not filter_file(file_name):
continue
yield file_name
EMACS_HEADER = "/* -*- Mode:"
VIM_HEADER = "/* vim:"
MAX_LICENSE_LINESPAN = max(len(license.splitlines()) for license in licenses)
def check_license(file_name, lines):
if any(file_name.endswith(ext) for ext in (".toml", ".lock", ".json")):
raise StopIteration
while lines and (lines[0].startswith(EMACS_HEADER) or lines[0].startswith(VIM_HEADER)):
lines = lines[1:]
contents = "".join(lines[:MAX_LICENSE_LINESPAN])
valid_license = any(contents.startswith(license) for license in licenses)
acknowledged_bad_license = "xfail-license" in contents
if not (valid_license or acknowledged_bad_license):
yield (1, "incorrect license")
def check_modeline(file_name, lines):
for idx, line in enumerate(lines[:5]):
if re.search('^.*[ \t](vi:|vim:|ex:)[ \t]', line):
yield (idx + 1, "vi modeline present")
elif re.search('-\*-.*-\*-', line, re.IGNORECASE):
yield (idx + 1, "emacs file variables present")
def check_length(file_name, idx, line):
if file_name.endswith(".lock") or file_name.endswith(".json"):
raise StopIteration
max_length = 120
if len(line.rstrip('\n')) > max_length:
yield (idx + 1, "Line is longer than %d characters" % max_length)
def check_whatwg_specific_url(idx, line):
match = re.search(r"https://html\.spec\.whatwg\.org/multipage/[\w-]+\.html#([\w\:-]+)", line)
if match is not None:
preferred_link = "https://html.spec.whatwg.org/multipage/#{}".format(match.group(1))
yield (idx + 1, "link to WHATWG may break in the future, use this format instead: {}".format(preferred_link))
def check_whatwg_single_page_url(idx, line):
match = re.search(r"https://html\.spec\.whatwg\.org/#([\w\:-]+)", line)
if match is not None:
preferred_link = "https://html.spec.whatwg.org/multipage/#{}".format(match.group(1))
yield (idx + 1, "links to WHATWG single-page url, change to multi page: {}".format(preferred_link))
def check_whitespace(idx, line):
if line[-1] == "\n":
line = line[:-1]
else:
yield (idx + 1, "no newline at EOF")
if line.endswith(" "):
yield (idx + 1, "trailing whitespace")
if "\t" in line:
yield (idx + 1, "tab on line")
if "\r" in line:
yield (idx + 1, "CR on line")
def check_by_line(file_name, lines):
for idx, line in enumerate(lines):
errors = itertools.chain(
check_length(file_name, idx, line),
check_whitespace(idx, line),
check_whatwg_specific_url(idx, line),
check_whatwg_single_page_url(idx, line),
)
for error in errors:
yield error
def check_flake8(file_name, contents):
from flake8.main import check_code
if not file_name.endswith(".py"):
raise StopIteration
@contextlib.contextmanager
def stdout_redirect(where):
sys.stdout = where
try:
yield where
finally:
sys.stdout = sys.__stdout__
ignore = {
"W291", # trailing whitespace; the standard tidy process will enforce no trailing whitespace
"E501", # 80 character line length; the standard tidy process will enforce line length
}
output = StringIO.StringIO()
with stdout_redirect(output):
check_code(contents, ignore=ignore)
for error in output.getvalue().splitlines():
_, line_num, _, message = error.split(":", 3)
yield line_num, message.strip()
def check_lock(file_name, contents):
def find_reverse_dependencies(dependency, version, content):
dependency_prefix = "{} {}".format(dependency, version)
for package in itertools.chain([content["root"]], content["package"]):
for dependency in package.get("dependencies", []):
if dependency.startswith(dependency_prefix):
yield package["name"]
if not file_name.endswith(".lock"):
raise StopIteration
# package names to be neglected (as named by cargo)
exceptions = ["bitflags", "xml-rs", "byteorder"]
import toml
content = toml.loads(contents)
packages = {}
for package in content.get("package", []):
packages.setdefault(package["name"], []).append(package["version"])
for (name, versions) in packages.iteritems():
if name in exceptions or len(versions) <= 1:
continue
highest = max(versions)
for version in versions:
if version != highest:
reverse_dependencies = "\n".join(
"\t\t{}".format(n)
for n in find_reverse_dependencies(name, version, content)
)
substitutions = {
"package": name,
"old_version": version,
"new_version": highest,
"reverse_dependencies": reverse_dependencies
}
message = """
duplicate versions for package "{package}"
\t\033[93mfound dependency on version {old_version}\033[0m
\t\033[91mbut highest version is {new_version}\033[0m
\t\033[93mtry upgrading with\033[0m \033[96m./mach cargo-update -p {package}:{old_version}\033[0m
\tThe following packages depend on version {old_version}:
{reverse_dependencies}
""".format(**substitutions).strip()
yield (1, message)
def maybe_int(value):
try:
return int(value)
except ValueError:
return value
def check_toml(file_name, lines):
if not file_name.endswith(".toml"):
raise StopIteration
for idx, line in enumerate(lines):
if line.find("*") != -1:
yield (idx + 1, "found asterisk instead of minimum version number")
def check_rust(file_name, lines):
if not file_name.endswith(".rs") or \
file_name.endswith(".mako.rs") or \
file_name.endswith(os.path.join("style", "build.rs")) or \
file_name.endswith(os.path.join("geckolib", "build.rs")) or \
file_name.endswith(os.path.join("unit", "style", "stylesheets.rs")):
raise StopIteration
comment_depth = 0
merged_lines = ''
import_block = False
whitespace = False
prev_use = None
current_indent = 0
prev_crate = {}
prev_mod = {}
decl_message = "{} is not in alphabetical order"
decl_expected = "\n\t\033[93mexpected: {}\033[0m"
decl_found = "\n\t\033[91mfound: {}\033[0m"
for idx, original_line in enumerate(lines):
# simplify the analysis
line = original_line.strip()
# Simple heuristic to avoid common case of no comments.
if '/' in line:
comment_depth += line.count('/*')
comment_depth -= line.count('*/')
if line.endswith('\\'):
merged_lines += line[:-1]
continue
if comment_depth:
merged_lines += line
continue
if merged_lines:
line = merged_lines + line
merged_lines = ''
# Keep track of whitespace to enable checking for a merged import block
#
# Ignore attributes, comments, and imports
if import_block:
if not (line_is_comment(line) or line_is_attribute(line) or line.startswith("use ")):
whitespace = line == ""
if not whitespace:
import_block = False
# get rid of strings and chars because cases like regex expression, keep attributes
if not line_is_attribute(line):
line = re.sub(r'"(\\.|[^\\"])*?"|' + r"'(\\.|[^\\'])*?'", '', line)
# get rid of comments
line = re.sub('//.*?$|/\*.*?$|^\*.*?$', '', line)
# get rid of attributes that do not contain =
line = re.sub('^#[A-Za-z0-9\(\)\[\]_]*?$', '', line)
# flag this line if it matches one of the following regular expressions
# tuple format: (pattern, format_message, filter_function(match, line))
no_filter = lambda match, line: True
regex_rules = [
(r",[^\s]", "missing space after ,", lambda match, line: '$' not in line),
(r"[A-Za-z0-9\"]=", "missing space before =",
lambda match, line: line_is_attribute(line)),
(r"=[A-Za-z0-9\"]", "missing space after =",
lambda match, line: line_is_attribute(line)),
# ignore scientific notation patterns like 1e-6
(r"[A-DF-Za-df-z0-9]-", "missing space before -",
lambda match, line: not line_is_attribute(line)),
(r"[A-Za-z0-9]([\+/\*%=])", "missing space before {0}",
lambda match, line: (not line_is_attribute(line) and
not is_associated_type(match, line))),
# * not included because of dereferencing and casting
# - not included because of unary negation
(r'([\+/\%=])[A-Za-z0-9"]', "missing space after {0}",
lambda match, line: (not line_is_attribute(line) and
not is_associated_type(match, line))),
(r"\)->", "missing space before ->", no_filter),
(r"->[A-Za-z]", "missing space after ->", no_filter),
(r"[^ ]=>", "missing space before =>", lambda match, line: match.start() != 0),
(r"=>[^ ]", "missing space after =>", lambda match, line: match.end() != len(line)),
(r"=> ", "extra space after =>", no_filter),
# ignore " ::crate::mod" and "trait Foo : Bar"
(r" :[^:]", "extra space before :",
lambda match, line: 'trait ' not in line[:match.start()]),
# ignore "crate::mod" and ignore flagging macros like "$t1:expr"
(r"[^:]:[A-Za-z]", "missing space after :",
lambda match, line: '$' not in line[:match.end()]),
(r"[A-Za-z0-9\)]{", "missing space before {{", no_filter),
# ignore cases like "{}", "}`", "}}" and "use::std::{Foo, Bar}"
(r"[^\s{}]}[^`]", "missing space before }}",
lambda match, line: not re.match(r'^(pub )?use', line)),
# ignore cases like "{}", "`{", "{{" and "use::std::{Foo, Bar}"
(r"[^`]{[^\s{}]", "missing space after {{",
lambda match, line: not re.match(r'^(pub )?use', line)),
# There should not be any extra pointer dereferencing
(r": &Vec<", "use &[T] instead of &Vec<T>", no_filter),
# No benefit over using &str
(r": &String", "use &str instead of &String", no_filter),
(r"^&&", "operators should go at the end of the first line", no_filter),
]
for pattern, message, filter_func in regex_rules:
for match in re.finditer(pattern, line):
if not filter_func(match, line):
continue
yield (idx + 1, message.format(*match.groups(), **match.groupdict()))
# check alphabetical order of extern crates
if line.startswith("extern crate "):
# strip "extern crate " from the begin and ";" from the end
crate_name = line[13:-1]
indent = len(original_line) - len(line)
if indent not in prev_crate:
prev_crate[indent] = ""
if prev_crate[indent] > crate_name:
yield(idx + 1, decl_message.format("extern crate declaration")
+ decl_expected.format(prev_crate[indent])
+ decl_found.format(crate_name))
prev_crate[indent] = crate_name
# imports must be in the same line, alphabetically sorted, and merged
# into a single import block
if line.startswith("use "):
import_block = True
indent = len(original_line) - len(line)
if not line.endswith(";") and '{' in line:
yield (idx + 1, "use statement spans multiple lines")
# strip "use" from the begin and ";" from the end
current_use = line[4:-1]
if indent == current_indent and prev_use and current_use < prev_use:
yield(idx + 1, decl_message.format("use statement")
+ decl_expected.format(prev_use)
+ decl_found.format(current_use))
prev_use = current_use
current_indent = indent
if whitespace or not import_block:
current_indent = 0
# do not allow blank lines in an import block
if import_block and whitespace and line.startswith("use "):
whitespace = False
yield(idx, "encountered whitespace following a use statement")
# modules must be in the same line and alphabetically sorted
if line.startswith("mod ") or line.startswith("pub mod "):
indent = len(original_line) - len(line)
# strip /(pub )?mod/ from the left and ";" from the right
mod = line[4:-1] if line.startswith("mod ") else line[8:-1]
if (idx - 1) < 0 or "#[macro_use]" not in lines[idx - 1]:
match = line.find(" {")
if indent not in prev_mod:
prev_mod[indent] = ""
if match == -1 and not line.endswith(";"):
yield (idx + 1, "mod declaration spans multiple lines")
if len(prev_mod[indent]) > 0 and mod < prev_mod[indent]:
yield(idx + 1, decl_message.format("mod declaration")
+ decl_expected.format(prev_mod[indent])
+ decl_found.format(mod))
prev_mod[indent] = mod
else:
# we now erase previous entries
prev_mod = {}
# Avoid flagging <Item=Foo> constructs
def is_associated_type(match, line):
if match.group(1) != '=':
return False
open_angle = line[0:match.end()].rfind('<')
close_angle = line[open_angle:].find('>') if open_angle != -1 else -1
generic_open = open_angle != -1 and open_angle < match.start()
generic_close = close_angle != -1 and close_angle + open_angle >= match.end()
return generic_open and generic_close
def line_is_attribute(line):
return re.search(r"#\[.*\]", line)
def line_is_comment(line):
return re.search(r"^//|^/\*|^\*", line)
def check_webidl_spec(file_name, contents):
# Sorted by this function (in pseudo-Rust). The idea is to group the same
# organization together.
# fn sort_standards(a: &Url, b: &Url) -> Ordering {
# let a_domain = a.domain().split(".");
# a_domain.pop();
# a_domain.reverse();
# let b_domain = b.domain().split(".");
# b_domain.pop();
# b_domain.reverse();
# for i in a_domain.into_iter().zip(b_domain.into_iter()) {
# match i.0.cmp(b.0) {
# Less => return Less,
# Greater => return Greater,
# _ => (),
# }
# }
# a_domain.path().cmp(b_domain.path())
# }
if not file_name.endswith(".webidl"):
raise StopIteration
standards = [
"//www.khronos.org/registry/webgl/specs",
"//developer.mozilla.org/en-US/docs/Web/API",
"//dev.w3.org/2006/webapi",
"//dev.w3.org/csswg",
"//dev.w3.org/fxtf",
"//dvcs.w3.org/hg",
"//dom.spec.whatwg.org",
"//domparsing.spec.whatwg.org",
"//drafts.csswg.org/cssom",
"//drafts.fxtf.org",
"//encoding.spec.whatwg.org",
"//html.spec.whatwg.org",
"//url.spec.whatwg.org",
"//xhr.spec.whatwg.org",
"//w3c.github.io",
"//heycam.github.io/webidl",
"//webbluetoothcg.github.io/web-bluetooth/",
# Not a URL
"// This interface is entirely internal to Servo, and should not be" +
" accessible to\n// web pages."
]
for i in standards:
if contents.find(i) != -1:
raise StopIteration
yield 0, "No specification link found."
def check_json(filename, contents):
if not filename.endswith(".json"):
raise StopIteration
try:
json.loads(contents)
except ValueError as e:
match = re.search(r"line (\d+) ", e.message)
line_no = match and match.group(1)
yield (line_no, e.message)
def check_spec(file_name, lines):
if spec_base_path not in file_name:
raise StopIteration
file_name = os.path.relpath(os.path.splitext(file_name)[0], spec_base_path)
patt = re.compile("^\s*\/\/.+")
# Pattern representing a line with a macro
macro_patt = re.compile("^\s*\S+!(.*)$")
# Pattern representing a line with comment containing a spec link
link_patt = re.compile("^\s*///? https://.+$")
# Pattern representing a line with comment
comment_patt = re.compile("^\s*///?.+$")
pattern = "impl {}Methods for {} {{".format(file_name, file_name)
brace_count = 0
in_impl = False
for idx, line in enumerate(lines):
if "// check-tidy: no specs after this line" in line:
break
if not patt.match(line):
if pattern.lower() in line.lower():
in_impl = True
if ("fn " in line or macro_patt.match(line)) and brace_count == 1:
for up_idx in range(1, idx + 1):
up_line = lines[idx - up_idx]
if link_patt.match(up_line):
# Comment with spec link exists
break
if not comment_patt.match(up_line):
# No more comments exist above, yield warning
yield (idx + 1, "method declared in webidl is missing a comment with a specification link")
break
if '{' in line and in_impl:
brace_count += 1
if '}' in line and in_impl:
if brace_count == 1:
break
brace_count -= 1
def collect_errors_for_files(files_to_check, checking_functions, line_checking_functions):
(has_element, files_to_check) = is_iter_empty(files_to_check)
if not has_element:
raise StopIteration
print '\rChecking files for tidiness...'
for filename in files_to_check:
with open(filename, "r") as f:
contents = f.read()
for check in checking_functions:
for error in check(filename, contents):
# the result will be: `(filename, line, message)`
yield (filename,) + error
lines = contents.splitlines(True)
for check in line_checking_functions:
for error in check(filename, lines):
yield (filename,) + error
def get_wpt_files(only_changed_files, progress):
wpt_dir = os.path.join(".", "tests", "wpt", "web-platform-tests" + os.sep)
file_iter = get_file_list(os.path.join(wpt_dir), only_changed_files)
(has_element, file_iter) = is_iter_empty(file_iter)
if not has_element:
raise StopIteration
print '\nRunning the WPT lint...'
if progress:
file_iter = progress_wrapper(file_iter)
for f in file_iter:
if filter_file(f):
yield f[len(wpt_dir):]
def check_wpt_lint_errors(files):
wpt_working_dir = os.path.abspath(os.path.join(".", "tests", "wpt", "web-platform-tests"))
if os.path.isdir(wpt_working_dir):
site.addsitedir(wpt_working_dir)
from tools.lint import lint
returncode = lint.lint(files)
if returncode:
yield ("WPT Lint Tool", "", "lint error(s) in Web Platform Tests: exit status {0}".format(returncode))
def get_file_list(directory, only_changed_files=False, exclude_dirs=[]):
if only_changed_files:
# only check the files that have been changed since the last merge
args = ["git", "log", "-n1", "--author=bors-servo", "--format=%H"]
last_merge = subprocess.check_output(args).strip()
args = ["git", "diff", "--name-only", last_merge, directory]
file_list = subprocess.check_output(args)
# also check untracked files
args = ["git", "ls-files", "--others", "--exclude-standard", directory]
file_list += subprocess.check_output(args)
for f in file_list.splitlines():
yield os.path.join('.', f)
elif exclude_dirs:
for root, dirs, files in os.walk(directory, topdown=True):
# modify 'dirs' in-place so that we don't do unwanted traversals in excluded directories
dirs[:] = [d for d in dirs if not any(os.path.join(root, d).startswith(name) for name in ignored_dirs)]
for rel_path in files:
yield os.path.join(root, rel_path)
else:
for root, _, files in os.walk(directory):
for f in files:
yield os.path.join(root, f)
def scan(faster=False, progress=True):
# standard checks
files_to_check = filter_files('.', faster, progress)
checking_functions = (check_flake8, check_lock, check_webidl_spec, check_json)
line_checking_functions = (check_license, check_by_line, check_toml, check_rust, check_spec, check_modeline)
errors = collect_errors_for_files(files_to_check, checking_functions, line_checking_functions)
# wpt lint checks
wpt_lint_errors = check_wpt_lint_errors(get_wpt_files(faster, progress))
# collect errors
errors = itertools.chain(errors, wpt_lint_errors)
error = None
for error in errors:
print "\r\033[94m{}\033[0m:\033[93m{}\033[0m: \033[91m{}\033[0m".format(*error)
print
if error is None:
print "\033[92mtidy reported no errors.\033[0m"
return int(error is not None)
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