scripts/util.py

# Copyright 2022 Google Inc. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import argparse
from pathlib import Path
import platform
import subprocess

parser = argparse.ArgumentParser()
parser.add_argument(
    "--flatc",
    help="path of the Flat C compiler relative to the root directory",
)
parser.add_argument("--cpp-0x", action="store_true", help="use --cpp-std c++ox")
parser.add_argument(
    "--skip-monster-extra",
    action="store_true",
    help="skip generating tests involving monster_extra.fbs",
)
parser.add_argument(
    "--skip-gen-reflection",
    action="store_true",
    help="skip generating the reflection.fbs files",
)
args = parser.parse_args()

# Get the path where this script is located so we can invoke the script from
# any directory and have the paths work correctly.
script_path = Path(__file__).parent.resolve()

# Get the root path as an absolute path, so all derived paths are absolute.
root_path = script_path.parent.absolute()
tests_path = Path(root_path, "tests")

# Get the location of the flatc executable, reading from the first command line
# argument or defaulting to default names.
flatc_exe = Path(
    ("flatc" if not platform.system() == "Windows" else "flatc.exe")
    if not args.flatc
    else args.flatc
)

# Find and assert flatc compiler is present.
if root_path in flatc_exe.parents:
  flatc_exe = flatc_exe.relative_to(root_path)
flatc_path = Path(root_path, flatc_exe)
assert flatc_path.exists(), "Cannot find the flatc compiler " + str(flatc_path)


# Execute the flatc compiler with the specified parameters
def flatc(
    options, schema, prefix=None, include=None, data=None, cwd=tests_path
):
  cmd = [str(flatc_path)] + options
  if prefix:
    cmd += ["-o"] + [prefix]
  if include:
    cmd += ["-I"] + [include]
  cmd += [schema] if isinstance(schema, str) else schema
  if data:
    cmd += [data] if isinstance(data, str) else data
  result = subprocess.run(cmd, cwd=str(cwd), check=True)