build/dart/sdk/gen_meta_file.py

#!/usr/bin/env fuchsia-vendored-python
# Copyright 2018 The Fuchsia Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

import argparse
import json
import os
import sys
import yaml

# The list of packages that should be pulled from a Flutter SDK instead of pub.
FLUTTER_PACKAGES = [
    "flutter",
    "flutter_driver",
    "flutter_test",
    "flutter_tools",
]


def main():
    parser = argparse.ArgumentParser("Builds a metadata file")
    parser.add_argument("--out", help="Path to the output file", required=True)
    parser.add_argument(
        "--name", help="Name of the original package", required=True
    )
    parser.add_argument(
        "--root", help="Root of the package in the SDK", required=True
    )
    parser.add_argument(
        "--specs", help="Path to spec files of dependencies", nargs="*"
    )
    parser.add_argument(
        "--third-party-specs",
        help="Path to pubspec files of 3p dependencies",
        nargs="*",
    )
    parser.add_argument("--sources", help="List of library sources", nargs="+")
    parser.add_argument(
        "--dart-library-null-safe",
        help="Null safety flag for dart libraries",
        action="store_true",
    )
    args = parser.parse_args()

    metadata = {
        "type": "dart_library",
        "name": args.name,
        "root": args.root,
        "sources": args.sources,
    }

    if args.dart_library_null_safe:
        metadata["dart_library_null_safe"] = True

    third_party_deps = []
    for spec in args.third_party_specs:
        with open(spec, "r") as spec_file:
            manifest = yaml.safe_load(spec_file)
            name = manifest["name"]
            dep = {
                "name": name,
            }
            if name in FLUTTER_PACKAGES:
                dep["version"] = "flutter_sdk"
            else:
                if "version" not in manifest:
                    raise Exception("%s does not specify a version." % spec)
                dep["version"] = manifest["version"]
            third_party_deps.append(dep)
    metadata["third_party_deps"] = third_party_deps

    deps = []
    fidl_deps = []
    for spec in args.specs:
        with open(spec, "r") as spec_file:
            data = json.load(spec_file)
        type = data["type"]
        name = data["name"]
        if type == "dart_library":
            deps.append(name)
        elif type == "fidl_library":
            fidl_deps.append(name)
        else:
            raise Exception("Unsupported dependency type: %s" % type)
    metadata["deps"] = deps
    metadata["fidl_deps"] = fidl_deps

    with open(args.out, "w") as out_file:
        json.dump(
            metadata, out_file, indent=2, sort_keys=True, separators=(",", ": ")
        )

    return 0


if __name__ == "__main__":
    sys.exit(main())