tools/polymer/html_to_js.py

# Copyright 2020 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

# Inlines an HTML file into a JS (or TS) file at a location specified by a
# placeholder. This is useful for implementing Web Components using JS modules,
# where all the HTML needs to reside in the JS file (no more HTML imports).

import argparse
import sys
import io
from os import path, getcwd
from polymer import process_v3_ready

_CWD = getcwd()


def main(argv):
  parser = argparse.ArgumentParser()
  parser.add_argument('--in_folder', required=True)
  parser.add_argument('--out_folder', required=True)
  parser.add_argument('--js_files', required=True, nargs="*")
  args = parser.parse_args(argv)

  in_folder = path.normpath(path.join(_CWD, args.in_folder))
  out_folder = path.normpath(path.join(_CWD, args.out_folder))

  results = []
  for js_file in args.js_files:
    # Detect file extension, since it can be either a .ts or .js file.
    extension = path.splitext(js_file)[1]
    html_file = path.basename(js_file).replace(extension, '.html')
    result = process_v3_ready(
        path.join(in_folder, js_file), path.join(in_folder, html_file))

    with io.open(path.join(out_folder, result[1]), mode='wb') as f:
      for l in result[0]:
        f.write(l.encode('utf-8'))
  return


if __name__ == '__main__':
  main(sys.argv[1:])