#!/usr/bin/env python
# Copyright (C) 2015 Google Inc. All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above
# copyright notice, this list of conditions and the following disclaimer
# in the documentation and/or other materials provided with the
# distribution.
# * Neither the name of Google Inc. nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
import json5_generator
import make_runtime_features
import name_utilities
import template_expander
# We want exactly the same parsing as RuntimeFeatureWriter
# but generate different files.
class OriginTrialsWriter(make_runtime_features.BaseRuntimeFeatureWriter):
file_basename = 'origin_trials'
def __init__(self, json5_file_path, output_dir):
super(OriginTrialsWriter, self).__init__(json5_file_path, output_dir)
self._outputs = {
(self.file_basename + '.cc'): self.generate_implementation,
}
self._implied_mappings = self._make_implied_mappings()
self._trial_to_features_map = self._make_trial_to_features_map()
self._max_features_per_trial = max(
len(features) for features in self._trial_to_features_map.values())
self._set_trial_types()
@property
def origin_trial_features(self):
return self._origin_trial_features
def _make_implied_mappings(self):
# Set up the implied_by relationships between trials.
implied_mappings = dict()
for implied_feature in (feature
for feature in self._origin_trial_features
if feature['origin_trial_feature_name']
and feature['implied_by']):
# An origin trial can only be implied by other features that also
# have a trial defined.
implied_by_trials = []
for implied_by_name in implied_feature['implied_by']:
if any(implied_by_name == feature['name'].original
and feature['origin_trial_feature_name']
for feature in self._origin_trial_features):
implied_by_trials.append(implied_by_name)
# Keep a set of origin trial features implied for each
# trial. This is essentially an inverse of the implied_by
# list attached to each feature.
implied_set = implied_mappings.get(implied_by_name)
if implied_set is None:
implied_set = set()
implied_mappings[implied_by_name] = implied_set
implied_set.add(implied_feature['name'].original)
implied_feature['implied_by_origin_trials'] = implied_by_trials
return implied_mappings
def _make_trial_to_features_map(self):
trial_feature_mappings = {}
for feature in [
feature for feature in self._origin_trial_features
if feature['origin_trial_feature_name']
]:
trial_name = feature['origin_trial_feature_name']
if trial_name in trial_feature_mappings:
trial_feature_mappings[trial_name].append(feature)
else:
trial_feature_mappings[trial_name] = [feature]
return trial_feature_mappings
def _set_trial_types(self):
for feature in self._origin_trial_features:
trial_type = feature['origin_trial_type']
if feature[
'origin_trial_allows_insecure'] and trial_type != 'deprecation':
raise Exception('Origin trial must have type deprecation to '
'specify origin_trial_allows_insecure: %s' %
feature['name'])
if trial_type:
feature[
'origin_trial_type'] = name_utilities._upper_camel_case(
trial_type)
@template_expander.use_jinja('templates/' + file_basename + '.cc.tmpl')
def generate_implementation(self):
return {
'features': self._features,
'origin_trial_features': self._origin_trial_features,
'implied_origin_trial_features': self._implied_mappings,
'trial_to_features_map': self._trial_to_features_map,
'max_features_per_trial': self._max_features_per_trial,
'input_files': self._input_files,
}
if __name__ == '__main__':
json5_generator.Maker(OriginTrialsWriter).main()
Codebase Browser
chromium