Adding upstream version 86.0.1.upstream/86.0.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 191 insertions, 0 deletions

diff --git a/tools/lint/python/flake8.py b/tools/lint/python/flake8.py
new file mode 100644
index 0000000000..49ab04b019
--- /dev/null
+++ b/tools/lint/python/flake8.py
@@ -0,0 +1,191 @@
+# 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 json
+import os
+import platform
+import subprocess
+import sys
+
+import mozfile
+import mozpack.path as mozpath
+
+from mozlint import result
+from mozlint.pathutils import expand_exclusions
+
+here = os.path.abspath(os.path.dirname(__file__))
+FLAKE8_REQUIREMENTS_PATH = os.path.join(here, "flake8_requirements.txt")
+
+FLAKE8_NOT_FOUND = """
+Could not find flake8! Install flake8 and try again.
+
+    $ pip install -U --require-hashes -r {}
+""".strip().format(
+    FLAKE8_REQUIREMENTS_PATH
+)
+
+
+FLAKE8_INSTALL_ERROR = """
+Unable to install correct version of flake8
+Try to install it manually with:
+    $ pip install -U --require-hashes -r {}
+""".strip().format(
+    FLAKE8_REQUIREMENTS_PATH
+)
+
+LINE_OFFSETS = {
+    # continuation line under-indented for hanging indent
+    "E121": (-1, 2),
+    # continuation line missing indentation or outdented
+    "E122": (-1, 2),
+    # continuation line over-indented for hanging indent
+    "E126": (-1, 2),
+    # continuation line over-indented for visual indent
+    "E127": (-1, 2),
+    # continuation line under-indented for visual indent
+    "E128": (-1, 2),
+    # continuation line unaligned for hanging indend
+    "E131": (-1, 2),
+    # expected 1 blank line, found 0
+    "E301": (-1, 2),
+    # expected 2 blank lines, found 1
+    "E302": (-2, 3),
+}
+"""Maps a flake8 error to a lineoffset tuple.
+
+The offset is of the form (lineno_offset, num_lines) and is passed
+to the lineoffset property of an `Issue`.
+"""
+
+
+def default_bindir():
+    # We use sys.prefix to find executables as that gets modified with
+    # virtualenv's activate_this.py, whereas sys.executable doesn't.
+    if platform.system() == "Windows":
+        return os.path.join(sys.prefix, "Scripts")
+    else:
+        return os.path.join(sys.prefix, "bin")
+
+
+class NothingToLint(Exception):
+    """Exception used to bail out of flake8's internals if all the specified
+    files were excluded.
+    """
+
+
+def setup(root, **lintargs):
+    virtualenv_manager = lintargs["virtualenv_manager"]
+    try:
+        virtualenv_manager.install_pip_requirements(
+            FLAKE8_REQUIREMENTS_PATH, quiet=True
+        )
+    except subprocess.CalledProcessError:
+        print(FLAKE8_INSTALL_ERROR)
+        return 1
+
+
+def lint(paths, config, **lintargs):
+    from flake8.main.application import Application
+
+    log = lintargs["log"]
+    root = lintargs["root"]
+    virtualenv_bin_path = lintargs.get("virtualenv_bin_path")
+    config_path = os.path.join(root, ".flake8")
+
+    if lintargs.get("fix"):
+        fix_cmd = [
+            os.path.join(virtualenv_bin_path or default_bindir(), "autopep8"),
+            "--global-config",
+            config_path,
+            "--in-place",
+            "--recursive",
+        ]
+
+        if config.get("exclude"):
+            fix_cmd.extend(["--exclude", ",".join(config["exclude"])])
+
+        subprocess.call(fix_cmd + paths)
+
+    # Run flake8.
+    app = Application()
+    log.debug("flake8 version={}".format(app.version))
+
+    output_file = mozfile.NamedTemporaryFile(mode="r")
+    flake8_cmd = [
+        "--config",
+        config_path,
+        "--output-file",
+        output_file.name,
+        "--format",
+        '{"path":"%(path)s","lineno":%(row)s,'
+        '"column":%(col)s,"rule":"%(code)s","message":"%(text)s"}',
+        "--filename",
+        ",".join(["*.{}".format(e) for e in config["extensions"]]),
+    ]
+    log.debug("Command: {}".format(" ".join(flake8_cmd)))
+
+    orig_make_file_checker_manager = app.make_file_checker_manager
+
+    def wrap_make_file_checker_manager(self):
+        """Flake8 is very inefficient when it comes to applying exclusion
+        rules, using `expand_exclusions` to turn directories into a list of
+        relevant python files is an order of magnitude faster.
+
+        Hooking into flake8 here also gives us a convenient place to merge the
+        `exclude` rules specified in the root .flake8 with the ones added by
+        tools/lint/mach_commands.py.
+        """
+        # Ignore exclude rules if `--no-filter` was passed in.
+        config.setdefault("exclude", [])
+        if lintargs.get("use_filters", True):
+            config["exclude"].extend(map(mozpath.normpath, self.options.exclude))
+
+        # Since we use the root .flake8 file to store exclusions, we haven't
+        # properly filtered the paths through mozlint's `filterpaths` function
+        # yet. This mimics that though there could be other edge cases that are
+        # different. Maybe we should call `filterpaths` directly, though for
+        # now that doesn't appear to be necessary.
+        filtered = [
+            p for p in paths if not any(p.startswith(e) for e in config["exclude"])
+        ]
+
+        self.args = self.args + list(expand_exclusions(filtered, config, root))
+
+        if not self.args:
+            raise NothingToLint
+        return orig_make_file_checker_manager()
+
+    app.make_file_checker_manager = wrap_make_file_checker_manager.__get__(
+        app, Application
+    )
+
+    # Make sure to run from repository root so exclusions are joined to the
+    # repository root and not the current working directory.
+    oldcwd = os.getcwd()
+    os.chdir(root)
+    try:
+        app.run(flake8_cmd)
+    except NothingToLint:
+        pass
+    finally:
+        os.chdir(oldcwd)
+
+    results = []
+
+    def process_line(line):
+        # Escape slashes otherwise JSON conversion will not work
+        line = line.replace("\\", "\\\\")
+        try:
+            res = json.loads(line)
+        except ValueError:
+            print("Non JSON output from linter, will not be processed: {}".format(line))
+            return
+
+        if res.get("code") in LINE_OFFSETS:
+            res["lineoffset"] = LINE_OFFSETS[res["code"]]
+
+        results.append(result.from_config(config, **res))
+
+    list(map(process_line, output_file.readlines()))
+    return results