为 Fuchsia 创建静态分析器

def http_links(ctx):
    for path, meta in ctx.scm.affected_files().items():
        for num, line in meta.new_lines():
            matches = ctx.re.allmatches(r"(http://)\w+", line)
            if not matches:
                continue
            for match in matches:
                ctx.emit.finding(
                    message = "Avoid http:// links, prefer https://",
                    # Change to "error" if the check should block presubmit.
                    level = "warning",
                    filepath = path,
                    line = num,
                    col = match.offset + 1,
                    end_col = match.offset + 1 + len(match.groups[1]),
                    replacements = ["https://"],
                )

load("./http_links.star", "http_links")  # NEW

...

def register_all_checks():
    ...
    shac.register_check(http_links)  # NEW
    ...

import json
import sys


def main():
    # Accepts one positional argument referring to the file to format.
    path = sys.args[1]
    with open(path) as f:
        original = f.read()
    # Always use 2-space indents and a trailing blank line.
    formatted = json.dumps(json.loads(original), indent=2) + "\n"
    if formatted == original:
        sys.exit(0)
    else:
        print(json.dumps(doc, indent=2) + "\n")
        sys.exit(1)


if __name__ == "__main__":
    main()

load("./common.star", "FORMATTER_MSG", "cipd_platform_name", "get_fuchsia_dir", "os_exec")

def json_format(ctx):
    # Launch processes in parallel.
    procs = {}
    for f in ctx.scm.affected_files():
        if not f.endswith(".json"):
            continue
        # Call fuchsia-specific `os_exec` function instead of
        # `ctx.os.exec()` to ensure proper executable resolution.
        # `os_exec` starts the subprocess but does not block.
        procs[f] = os_exec(ctx, [
            "%s/prebuilt/third_party/python3/%s/bin/python3" % (
                get_fuchsia_dir(ctx),
                cipd_platform_name(ctx),
            ),
            "scripts/shac/json_format.py",
            f,
        ])

    for f, proc in procs.items():
        # wait() blocks until the process completes.
        res = proc.wait()
        if proc.retcode != 0:
            ctx.emit.finding(
                level = "error",
                filepath = f,
                # FORMATTER_MSG is the standard message for formatters
                # in fuchsia.git.
                message = FORMATTER_MSG,
                # json_format.py prints the formatted file contents to stdout.
                # Passing it to `replacements` is necessary for shac to know
                # how to apply the fix.
                replacements = [res.stdout],
            )

# TODO: call this somewhere
shac.register_check(shac.check(
    json_format,
    # Mark the check as a formatter. Only checks with `formatter = True`
    # get run by `fx format-code`.
    formatter = True,
))