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# Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""Utility functions to explore the neighbor flags.
Part of the Chrome build flags optimization.
"""
__author__ = 'yuhenglong@google.com (Yuheng Long)'
import flags
from flags import Flag
def ClimbNext(flags_dict, climb_spec):
"""Get the flags who are different from flags_dict by climb_spec.
Args:
flags_dict: The dictionary containing the original flags whose neighbors are
to be explored.
climb_spec: The spec in the flags_dict is to be changed.
Returns:
A dictionary of neighbor flags.
"""
result = flags.Search(climb_spec)
# If the flags do not contain the spec.
if climb_spec not in flags_dict:
results = flags_dict.copy()
if result:
# Numeric flags.
results[climb_spec] = Flag(climb_spec, int(result.group('start')))
else:
# Boolean flags.
results[climb_spec] = Flag(climb_spec)
return [results]
# The flags contain the spec.
if not result:
# Boolean flags.
results = flags_dict.copy()
del results[climb_spec]
return [results]
# Numeric flags.
flag = flags_dict[climb_spec]
# The value of the flag having spec.
value = flag.GetValue()
results = []
if value + 1 < int(result.group('end')):
# If the value is not the end value, explore the value that is 1 larger than
# the current value.
neighbor = flags_dict.copy()
neighbor[climb_spec] = Flag(climb_spec, value + 1)
results.append(neighbor)
if value > int(result.group('start')):
# If the value is not the start value, explore the value that is 1 lesser
# than the current value.
neighbor = flags_dict.copy()
neighbor[climb_spec] = Flag(climb_spec, value - 1)
results.append(neighbor)
else:
# Delete the value.
neighbor = flags_dict.copy()
del neighbor[climb_spec]
results.append(neighbor)
return results
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