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# 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/.
import re
from collections import OrderedDict
import six
from mozpack.errors import errors
from packaging.version import Version
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)
def __eq__(self, other):
return str(self) == other
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)
def __eq__(self, other):
return str(self) == other
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(("==", Version(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], Version(value[2:])))
else:
self.values.append((value[0], Version(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 = Version(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)
def __eq__(self, other):
return str(self) == other
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,
"backgroundtask": 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 name not in self.FLAGS:
errors.fatal("Unknown flag: %s" % name)
continue
if name not 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 six.iteritems(filter):
if name not in self:
continue
if not self[name].matches(value):
return False
return True
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