| # Copyright 2017 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. |
| |
| import json5_generator |
| |
| |
| class FieldAliasExpander(object): |
| """ |
| A helper for expanding the "field_template" parameter in css_properties.json5 |
| |
| It takes the list of aliases and expansions from the given file_path, (it |
| should point to core/css/computed_style_field_aliases.json5) and uses that to |
| inform which fields in a given property should be set. |
| """ |
| |
| def __init__(self, file_path): |
| loaded_file = json5_generator.Json5File.load_from_files([file_path]) |
| self._field_aliases = dict([ |
| (alias["name"], alias) for alias in loaded_file.name_dictionaries |
| ]) |
| |
| def expand_field_alias(self, property_): |
| """ |
| Does expansion based on the value of field_template of a given property. |
| """ |
| if property_['field_template'] in self._field_aliases: |
| alias_template = property_['field_template'] |
| for field in self._field_aliases[alias_template]: |
| if field == 'name': |
| continue |
| property_[field] = self._field_aliases[alias_template][field] |
