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Diffstat (limited to 'python/mozbuild/mozpack/chrome/flags.py')
| -rw-r--r-- | python/mozbuild/mozpack/chrome/flags.py | 258 |
1 files changed, 258 insertions, 0 deletions
diff --git a/python/mozbuild/mozpack/chrome/flags.py b/python/mozbuild/mozpack/chrome/flags.py new file mode 100644 index 000000000..8c5c9a54c --- /dev/null +++ b/python/mozbuild/mozpack/chrome/flags.py @@ -0,0 +1,258 @@ +# This Source Code Form is subject to the terms of the Mozilla Public +# License, v. 2.0. If a copy of the MPL was not distributed with this +# file, You can obtain one at http://mozilla.org/MPL/2.0/. + +from __future__ import absolute_import + +import re +from distutils.version import LooseVersion +from mozpack.errors import errors +from collections import OrderedDict + + +class Flag(object): + ''' + Class for flags in manifest entries in the form: + "flag" (same as "flag=true") + "flag=yes|true|1" + "flag=no|false|0" + ''' + def __init__(self, name): + ''' + Initialize a Flag with the given name. + ''' + self.name = name + self.value = None + + def add_definition(self, definition): + ''' + Add a flag value definition. Replaces any previously set value. + ''' + if definition == self.name: + self.value = True + return + assert(definition.startswith(self.name)) + if definition[len(self.name)] != '=': + return errors.fatal('Malformed flag: %s' % definition) + value = definition[len(self.name) + 1:] + if value in ('yes', 'true', '1', 'no', 'false', '0'): + self.value = value + else: + return errors.fatal('Unknown value in: %s' % definition) + + def matches(self, value): + ''' + Return whether the flag value matches the given value. The values + are canonicalized for comparison. + ''' + if value in ('yes', 'true', '1', True): + return self.value in ('yes', 'true', '1', True) + if value in ('no', 'false', '0', False): + return self.value in ('no', 'false', '0', False, None) + raise RuntimeError('Invalid value: %s' % value) + + def __str__(self): + ''' + Serialize the flag value in the same form given to the last + add_definition() call. + ''' + if self.value is None: + return '' + if self.value is True: + return self.name + return '%s=%s' % (self.name, self.value) + + +class StringFlag(object): + ''' + Class for string flags in manifest entries in the form: + "flag=string" + "flag!=string" + ''' + def __init__(self, name): + ''' + Initialize a StringFlag with the given name. + ''' + self.name = name + self.values = [] + + def add_definition(self, definition): + ''' + Add a string flag definition. + ''' + assert(definition.startswith(self.name)) + value = definition[len(self.name):] + if value.startswith('='): + self.values.append(('==', value[1:])) + elif value.startswith('!='): + self.values.append(('!=', value[2:])) + else: + return errors.fatal('Malformed flag: %s' % definition) + + def matches(self, value): + ''' + Return whether one of the string flag definitions matches the given + value. + For example, + flag = StringFlag('foo') + flag.add_definition('foo!=bar') + flag.matches('bar') returns False + flag.matches('qux') returns True + flag = StringFlag('foo') + flag.add_definition('foo=bar') + flag.add_definition('foo=baz') + flag.matches('bar') returns True + flag.matches('baz') returns True + flag.matches('qux') returns False + ''' + if not self.values: + return True + for comparison, val in self.values: + if eval('value %s val' % comparison): + return True + return False + + def __str__(self): + ''' + Serialize the flag definitions in the same form given to each + add_definition() call. + ''' + res = [] + for comparison, val in self.values: + if comparison == '==': + res.append('%s=%s' % (self.name, val)) + else: + res.append('%s!=%s' % (self.name, val)) + return ' '.join(res) + + +class VersionFlag(object): + ''' + Class for version flags in manifest entries in the form: + "flag=version" + "flag<=version" + "flag<version" + "flag>=version" + "flag>version" + ''' + def __init__(self, name): + ''' + Initialize a VersionFlag with the given name. + ''' + self.name = name + self.values = [] + + def add_definition(self, definition): + ''' + Add a version flag definition. + ''' + assert(definition.startswith(self.name)) + value = definition[len(self.name):] + if value.startswith('='): + self.values.append(('==', LooseVersion(value[1:]))) + elif len(value) > 1 and value[0] in ['<', '>']: + if value[1] == '=': + if len(value) < 3: + return errors.fatal('Malformed flag: %s' % definition) + self.values.append((value[0:2], LooseVersion(value[2:]))) + else: + self.values.append((value[0], LooseVersion(value[1:]))) + else: + return errors.fatal('Malformed flag: %s' % definition) + + def matches(self, value): + ''' + Return whether one of the version flag definitions matches the given + value. + For example, + flag = VersionFlag('foo') + flag.add_definition('foo>=1.0') + flag.matches('1.0') returns True + flag.matches('1.1') returns True + flag.matches('0.9') returns False + flag = VersionFlag('foo') + flag.add_definition('foo>=1.0') + flag.add_definition('foo<0.5') + flag.matches('0.4') returns True + flag.matches('1.0') returns True + flag.matches('0.6') returns False + ''' + value = LooseVersion(value) + if not self.values: + return True + for comparison, val in self.values: + if eval('value %s val' % comparison): + return True + return False + + def __str__(self): + ''' + Serialize the flag definitions in the same form given to each + add_definition() call. + ''' + res = [] + for comparison, val in self.values: + if comparison == '==': + res.append('%s=%s' % (self.name, val)) + else: + res.append('%s%s%s' % (self.name, comparison, val)) + return ' '.join(res) + + +class Flags(OrderedDict): + ''' + Class to handle a set of flags definitions given on a single manifest + entry. + ''' + FLAGS = { + 'application': StringFlag, + 'appversion': VersionFlag, + 'platformversion': VersionFlag, + 'contentaccessible': Flag, + 'os': StringFlag, + 'osversion': VersionFlag, + 'abi': StringFlag, + 'platform': Flag, + 'xpcnativewrappers': Flag, + 'tablet': Flag, + 'process': StringFlag, + } + RE = re.compile(r'([!<>=]+)') + + def __init__(self, *flags): + ''' + Initialize a set of flags given in string form. + flags = Flags('contentaccessible=yes', 'appversion>=3.5') + ''' + OrderedDict.__init__(self) + for f in flags: + name = self.RE.split(f) + name = name[0] + if not name in self.FLAGS: + errors.fatal('Unknown flag: %s' % name) + continue + if not name in self: + self[name] = self.FLAGS[name](name) + self[name].add_definition(f) + + def __str__(self): + ''' + Serialize the set of flags. + ''' + return ' '.join(str(self[k]) for k in self) + + def match(self, **filter): + ''' + Return whether the set of flags match the set of given filters. + flags = Flags('contentaccessible=yes', 'appversion>=3.5', + 'application=foo') + flags.match(application='foo') returns True + flags.match(application='foo', appversion='3.5') returns True + flags.match(application='foo', appversion='3.0') returns False + ''' + for name, value in filter.iteritems(): + if not name in self: + continue + if not self[name].matches(value): + return False + return True |