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gecko-dev/servo/python/tidy.py
Daan Sprenkels fae3c8f777 servo: Merge #9066 - tidy.py: pass list of lines to each testing function (from dsprenkels:issue-9060); r=Wafflespeanut 
instead of whole content buffer

See #9060.

Source-Repo: https://github.com/servo/servo
Source-Revision: d2e7fd82213a6b2df6703dc6f9ace70e49762c5a
2015-12-26 18:15:12 +05:01

613 lines
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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 os
import fnmatch
import itertools
import re
import StringIO
import sys
from licenseck import licenses
filetypes_to_check = [".rs", ".rc", ".cpp", ".c", ".h", ".lock", ".py", ".toml", ".webidl"]
reftest_dir = "./tests/ref"
reftest_filetype = ".list"
ignored_files = [
# Upstream
os.path.join(".", "support", "*"),
os.path.join(".", "tests", "wpt", "css-tests", "*"),
os.path.join(".", "tests", "wpt", "harness", "*"),
os.path.join(".", "tests", "wpt", "sync", "*"),
os.path.join(".", "tests", "wpt", "sync_css", "*"),
os.path.join(".", "tests", "wpt", "update", "*"),
os.path.join(".", "tests", "wpt", "web-platform-tests", "*"),
os.path.join(".", "python", "mach", "*"),
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", "gonk", "src", "native_window_glue.cpp"),
os.path.join(".", "ports", "cef", "*"),
# MIT license
os.path.join(".", "components", "util", "deque", "mod.rs"),
# Hidden files/directories
os.path.join(".", ".*"),
]
def should_check(file_name):
if os.path.basename(file_name) == "Cargo.lock":
return True
if ".#" in file_name:
return False
if os.path.splitext(file_name)[1] not in filetypes_to_check:
return False
for pattern in ignored_files:
if fnmatch.fnmatch(file_name, pattern):
return False
return True
def should_check_reftest(file_name):
return file_name.endswith(reftest_filetype)
EMACS_HEADER = "/* -*- Mode:"
VIM_HEADER = "/* vim:"
MAX_LICENSE_LINESPAN = max(len(license.splitlines()) for license in licenses)
def check_license(file_name, lines):
if file_name.endswith(".toml") or file_name.endswith(".lock"):
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_length(file_name, idx, line):
if file_name.endswith(".lock"):
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 = ["libc", "cocoa"]
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("properties.mako.rs") or \
file_name.endswith(os.path.join("style", "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('".*?"|\'.*?\'', '', line)
# get rid of comments
line = re.sub('//.*?$|/\*.*?$|^\*.*?$', '', line)
# get rid of attributes that do not contain =
line = re.sub('^#[A-Za-z0-9\(\)\[\]_]*?$', '', line)
match = re.search(r",[^\s]", line)
if match and '$' not in line:
yield (idx + 1, "missing space after ,")
if line_is_attribute(line):
pre_space_re = r"[A-Za-z0-9]="
post_space_re = r"=[A-Za-z0-9\"]"
else:
# - not included because of scientific notation (1e-6)
pre_space_re = r"[A-Za-z0-9][\+/\*%=]"
# * not included because of dereferencing and casting
# - not included because of unary negation
post_space_re = r"[\+/\%=][A-Za-z0-9\"]"
match = re.search(pre_space_re, line)
if match and not is_associated_type(match, line, 1):
yield (idx + 1, "missing space before %s" % match.group(0)[1])
match = re.search(post_space_re, line)
if match and not is_associated_type(match, line, 0):
yield (idx + 1, "missing space after %s" % match.group(0)[0])
match = re.search(r"\)->", line)
if match:
yield (idx + 1, "missing space before ->")
match = re.search(r"->[A-Za-z]", line)
if match:
yield (idx + 1, "missing space after ->")
line_len = len(line)
arrow_pos = line.find("=>")
if arrow_pos != -1:
if arrow_pos and line[arrow_pos - 1] != ' ':
yield (idx + 1, "missing space before =>")
if arrow_pos + 2 < line_len and line[arrow_pos + 2] != ' ':
yield (idx + 1, "missing space after =>")
elif arrow_pos + 3 < line_len and line[arrow_pos + 3] == ' ':
yield (idx + 1, "extra space after =>")
# Avoid flagging ::crate::mod and `trait Foo : Bar`
match = line.find(" :")
if match != -1:
if line[0:match].find('trait ') == -1 and line[match + 2] != ':':
yield (idx + 1, "extra space before :")
# Avoid flagging crate::mod
match = re.search(r"[^:]:[A-Za-z]", line)
if match:
# Avoid flagging macros like $t1:expr
if line[0:match.end()].rfind('$') == -1:
yield (idx + 1, "missing space after :")
match = re.search(r"[A-Za-z0-9\)]{", line)
if match:
yield (idx + 1, "missing space before {")
# ignored cases like {}, }` and }}
match = re.search(r"[^\s{}]}[^`]", line)
if match and not (line.startswith("use") or line.startswith("pub use")):
yield (idx + 1, "missing space before }")
# ignored cases like {}, `{ and {{
match = re.search(r"[^`]{[^\s{}]", line)
if match and not (line.startswith("use") or line.startswith("pub use")):
yield (idx + 1, "missing space after {")
# check extern crates
if line.startswith("extern crate "):
crate_name = line[len("extern crate "):-1]
indent = len(original_line) - line_len
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
elif line.startswith("use "):
import_block = True
use = line[4:]
indent = len(original_line) - line_len
if not use.endswith(";"):
yield (idx + 1, "use statement spans multiple lines")
current_use = use[:len(use) - 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
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) - line_len
mod = line[4:] if line.startswith("mod ") else line[8:]
if idx < 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 mod.endswith(";"):
yield (idx + 1, "mod declaration spans multiple lines")
mod = mod[:len(mod) - 1]
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 = {}
# There should not be any extra pointer dereferencing
if ": &Vec<" in line:
yield (idx + 1, "use &[T] instead of &Vec<T>")
# No benefit over using &str
if ": &String" in line:
yield (idx + 1, "use &str instead of &String")
# Avoid flagging <Item=Foo> constructs
def is_associated_type(match, line, index):
open_angle = line[0:match.end()].rfind('<')
close_angle = line[open_angle:].find('>') if open_angle != -1 else -1
is_equals = match.group(0)[index] == '='
generic_open = open_angle != -1 and open_angle < match.start()
generic_close = close_angle != -1 and close_angle + open_angle >= match.end()
return is_equals and 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.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",
# 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_spec(file_name, lines):
base_path = "components/script/dom/"
if base_path not in file_name:
raise StopIteration
file_name = os.path.relpath(os.path.splitext(file_name)[0], 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 %sMethods for %s {" % (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):
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 check_reftest_order(files_to_check):
for file_name in files_to_check:
with open(file_name, "r") as fp:
split_lines = fp.read().splitlines()
lines = filter(lambda l: len(l) > 0 and l[0] != '#', split_lines)
for idx, line in enumerate(lines[:-1]):
next_line = lines[idx + 1]
current = get_reftest_names(line)
next = get_reftest_names(next_line)
if current is not None and next is not None and current > next:
yield (file_name, split_lines.index(next_line) + 1, "line not in alphabetical order")
def get_reftest_names(line):
tokens = line.split()
if len(tokens) == 3:
return tokens[1] + tokens[2]
if len(tokens) == 4:
return tokens[2] + tokens[3]
return None
def get_html_file_names_from_reftest_list(reftest_dir, file_name):
for line in open(os.path.join(reftest_dir, file_name), "r"):
for token in line.split():
if fnmatch.fnmatch(token, '*.html'):
yield os.path.join(reftest_dir, token)
def check_reftest_html_files_in_basic_list(reftest_dir):
basic_list_files = set(get_html_file_names_from_reftest_list(reftest_dir, "basic" + reftest_filetype))
for file_name in os.listdir(reftest_dir):
file_path = os.path.join(reftest_dir, file_name)
if fnmatch.fnmatch(file_path, '*.html') and file_path not in basic_list_files:
yield (file_path, "", "not found in basic.list")
def check_wpt_lint_errors():
import subprocess
wpt_working_dir = os.path.abspath(os.path.join(".", "tests", "wpt", "web-platform-tests"))
lint_cmd = os.path.join(wpt_working_dir, "lint")
try:
subprocess.check_call(lint_cmd, cwd=wpt_working_dir) # Must run from wpt's working dir
except subprocess.CalledProcessError as e:
yield ("WPT Lint Tool", "", "lint error(s) in Web Platform Tests: exit status {0}".format(e.returncode))
def scan():
all_files = (os.path.join(r, f) for r, _, files in os.walk(".") for f in files)
files_to_check = filter(should_check, all_files)
checking_functions = (check_flake8, check_lock, check_webidl_spec)
line_checking_functions = (check_license, check_by_line, check_toml, check_rust, check_spec)
errors = collect_errors_for_files(files_to_check, checking_functions, line_checking_functions)
reftest_files = (os.path.join(r, f) for r, _, files in os.walk(reftest_dir) for f in files)
reftest_to_check = filter(should_check_reftest, reftest_files)
r_errors = check_reftest_order(reftest_to_check)
not_found_in_basic_list_errors = check_reftest_html_files_in_basic_list(reftest_dir)
wpt_lint_errors = check_wpt_lint_errors()
errors = itertools.chain(errors, r_errors, not_found_in_basic_list_errors, wpt_lint_errors)
error = None
for error in errors:
print "\033[94m{}\033[0m:\033[93m{}\033[0m: \033[91m{}\033[0m".format(*error)
if error is None:
print "\033[92mtidy reported no errors.\033[0m"
return 0
else:
return 1
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