diff options
Diffstat (limited to 'bestflags/flags_util.py')
| -rw-r--r-- | bestflags/flags_util.py | 163 |
1 files changed, 82 insertions, 81 deletions
diff --git a/bestflags/flags_util.py b/bestflags/flags_util.py index 20be57fb..c4a490e2 100644 --- a/bestflags/flags_util.py +++ b/bestflags/flags_util.py @@ -1,4 +1,4 @@ -# Copyright (c) 2013 The Chromium OS Authors. All rights reserved. +# Copyright 2013 The ChromiumOS Authors # 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. @@ -6,90 +6,91 @@ Part of the Chrome build flags optimization. """ -__author__ = 'yuhenglong@google.com (Yuheng Long)' +__author__ = "yuhenglong@google.com (Yuheng Long)" import flags from flags import Flag def ClimbNext(flags_dict, climb_spec): - """Get the flags that are different from |flags_dict| by |climb_spec|. - - Given a set of flags, |flags_dict|, return a new set of flags that are - adjacent along the flag spec |climb_spec|. - - An example flags_dict is {foo=[1-9]:foo=5, bar=[1-5]:bar=2} and climb_spec is - bar=[1-5]. This method changes the flag that contains the spec bar=[1-5]. The - results are its neighbors dictionaries, i.e., {foo=[1-9]:foo=5, - bar=[1-5]:bar=1} and {foo=[1-9]:foo=5, bar=[1-5]:bar=3}. - - 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. The spec is a - definition in the little language, a string with escaped sequences of the - form [<start>-<end>] where start and end is an positive integer for a - fillable value. An example of a spec is "foo[0-9]". - - Returns: - List of dictionaries of neighbor flags. - """ - - # This method searches for a pattern [start-end] in the spec. If the spec - # contains this pattern, it is a numeric flag. Otherwise it is a boolean flag. - # For example, -finline-limit=[1-1000] is a numeric flag and -falign-jumps is - # a boolean flag. - numeric_flag_match = flags.Search(climb_spec) - - # If the flags do not contain the spec. - if climb_spec not in flags_dict: - results = flags_dict.copy() - - if numeric_flag_match: - # Numeric flags. - results[climb_spec] = Flag(climb_spec, - int(numeric_flag_match.group('start'))) + """Get the flags that are different from |flags_dict| by |climb_spec|. + + Given a set of flags, |flags_dict|, return a new set of flags that are + adjacent along the flag spec |climb_spec|. + + An example flags_dict is {foo=[1-9]:foo=5, bar=[1-5]:bar=2} and climb_spec is + bar=[1-5]. This method changes the flag that contains the spec bar=[1-5]. The + results are its neighbors dictionaries, i.e., {foo=[1-9]:foo=5, + bar=[1-5]:bar=1} and {foo=[1-9]:foo=5, bar=[1-5]:bar=3}. + + 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. The spec is a + definition in the little language, a string with escaped sequences of the + form [<start>-<end>] where start and end is an positive integer for a + fillable value. An example of a spec is "foo[0-9]". + + Returns: + List of dictionaries of neighbor flags. + """ + + # This method searches for a pattern [start-end] in the spec. If the spec + # contains this pattern, it is a numeric flag. Otherwise it is a boolean flag. + # For example, -finline-limit=[1-1000] is a numeric flag and -falign-jumps is + # a boolean flag. + numeric_flag_match = flags.Search(climb_spec) + + # If the flags do not contain the spec. + if climb_spec not in flags_dict: + results = flags_dict.copy() + + if numeric_flag_match: + # Numeric flags. + results[climb_spec] = Flag( + climb_spec, int(numeric_flag_match.group("start")) + ) + else: + # Boolean flags. + results[climb_spec] = Flag(climb_spec) + + return [results] + + # The flags contain the spec. + if not numeric_flag_match: + # Boolean flags. + results = flags_dict.copy() + + # Turn off the flag. A flag is turned off if it is not presented in the + # flags_dict. + 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(numeric_flag_match.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(numeric_flag_match.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: - # Boolean flags. - results[climb_spec] = Flag(climb_spec) - - return [results] - - # The flags contain the spec. - if not numeric_flag_match: - # Boolean flags. - results = flags_dict.copy() - - # Turn off the flag. A flag is turned off if it is not presented in the - # flags_dict. - 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(numeric_flag_match.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(numeric_flag_match.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, i.e., turn off the flag. A flag is turned off if it is - # not presented in the flags_dict. - neighbor = flags_dict.copy() - del neighbor[climb_spec] - results.append(neighbor) - - return results + # Delete the value, i.e., turn off the flag. A flag is turned off if it is + # not presented in the flags_dict. + neighbor = flags_dict.copy() + del neighbor[climb_spec] + results.append(neighbor) + + return results |