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# Copyright 2021 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.
# Generates JS files that can be used as standard scripts rather than native
# JS modules, by removing module-only keywords:
# import --> Removes entire line
# export --> Removes "export" keyword only
# Appends a console warning about using pre-JS module files.
#
# This script is intentionally very simple and is intended only to support
# legacy UIs that are not served from a standard chrome:// URL and therefore
# need to inline all scripts into a single HTML file. It does not, for example,
# restore other deprecated patterns like cr.define().
import argparse
import io
import os
import re
import sys
_CWD = os.getcwd()
IMPORT_LINE_REGEX = 'import'
EXPORT_LINE_REGEX = 'export '
def ProcessFile(filename, out_filename):
with io.open(filename, encoding='utf-8', mode='r') as f:
lines = f.readlines();
for i, line in enumerate(lines):
# Since this tool is used to generate non-module files that are expected
# to be inlined, any imported dependencies will be missing. Imports should
# not be used by files passed to this tool.
assert not re.match(IMPORT_LINE_REGEX, line), 'Unexpected import'
lines[i] = line.replace(EXPORT_LINE_REGEX, '')
lines.append(
' console.warn(\'crbug/1173575, non-JS module files deprecated.\');');
# Reconstruct file.
# Specify the newline character so that the exact same file is generated
# across platforms.
with io.open(out_filename, 'wb') as f:
for l in lines:
f.write(l.encode('utf-8'))
return
def main(argv):
parser = argparse.ArgumentParser()
parser.add_argument('--input_files', nargs='*', required=True)
parser.add_argument('--output_files', nargs='*', required=True)
parser.add_argument('--in_folder', required=True)
parser.add_argument('--out_folder', required=True)
args = parser.parse_args(argv)
in_folder = os.path.normpath(os.path.join(_CWD, args.in_folder))
out_folder = os.path.normpath(os.path.join(_CWD, args.out_folder))
index = 0
for f in args.input_files:
ProcessFile(os.path.join(in_folder, f),
os.path.join(out_folder, args.output_files[index]))
index = index + 1
if __name__ == '__main__':
main(sys.argv[1:])
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