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# Copyright 2025 The Chromium Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""Checks for new additions of Polymer (rather than Lit) imports.
"""
from . import regex_check
def AddedPolymerImportsCheck(input_api, output_api, file_filter=lambda f: True):
results = []
def PolymerImportCheck(line_number, line):
return regex_check.RegexCheck(
input_api.re, line_number, line,
r"(\/\/resources\/polymer\/v3_0\/polymer\/polymer_bundled\.min\.js)",
"Polymer is deprecated, new elements should be added in Lit instead")
def AddedPolymerImportsFilter(affected_file):
# Fastest way to see if a file is added and has a .ts extension. Imports
# won't appear in HTML or other files.
return affected_file.Action() == 'A' and \
affected_file.LocalPath().endswith('.ts')
# Call AddedPolymerImportsFilter first because it is a cheap filter that will
# reject most files, thus reducing the number of calls to file_filter which
# might be expensive.
wrapped_filter = lambda f: AddedPolymerImportsFilter(f) and file_filter(f)
added_files = input_api.AffectedFiles(include_deletes=False,
file_filter=wrapped_filter)
for f in added_files:
error_lines = []
for i, line in f.ChangedContents():
error_lines += [_f for _f in [
PolymerImportCheck(i, line),
] if _f]
if error_lines:
error_lines = [
"Found JavaScript style violations in %s:" % f.LocalPath()
] + error_lines
results.append(output_api.PresubmitError("\n".join(error_lines)))
return results
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