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author | Patrick Williams <patrick@stwcx.xyz> | 2015-09-15 22:41:29 +0300 |
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committer | Patrick Williams <patrick@stwcx.xyz> | 2015-09-15 22:41:29 +0300 |
commit | 21f9b84b4b729fbd7acbd465e7a3f726e4d20f91 (patch) | |
tree | eb2d091d427ca0813b445509d59cc8e27e8ad25f /yocto-poky/meta/lib/oe/maketype.py | |
parent | 101cef31e2bf54c678501155cd2106251acbd076 (diff) | |
parent | c124f4f2e04dca16a428a76c89677328bc7bf908 (diff) | |
download | openbmc-21f9b84b4b729fbd7acbd465e7a3f726e4d20f91.tar.xz |
Merge commit 'c124f4f2e04dca16a428a76c89677328bc7bf908' as 'yocto-poky'
Diffstat (limited to 'yocto-poky/meta/lib/oe/maketype.py')
-rw-r--r-- | yocto-poky/meta/lib/oe/maketype.py | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/yocto-poky/meta/lib/oe/maketype.py b/yocto-poky/meta/lib/oe/maketype.py new file mode 100644 index 000000000..139f33369 --- /dev/null +++ b/yocto-poky/meta/lib/oe/maketype.py @@ -0,0 +1,99 @@ +"""OpenEmbedded variable typing support + +Types are defined in the metadata by name, using the 'type' flag on a +variable. Other flags may be utilized in the construction of the types. See +the arguments of the type's factory for details. +""" + +import inspect +import types + +available_types = {} + +class MissingFlag(TypeError): + """A particular flag is required to construct the type, but has not been + provided.""" + def __init__(self, flag, type): + self.flag = flag + self.type = type + TypeError.__init__(self) + + def __str__(self): + return "Type '%s' requires flag '%s'" % (self.type, self.flag) + +def factory(var_type): + """Return the factory for a specified type.""" + if var_type is None: + raise TypeError("No type specified. Valid types: %s" % + ', '.join(available_types)) + try: + return available_types[var_type] + except KeyError: + raise TypeError("Invalid type '%s':\n Valid types: %s" % + (var_type, ', '.join(available_types))) + +def create(value, var_type, **flags): + """Create an object of the specified type, given the specified flags and + string value.""" + obj = factory(var_type) + objflags = {} + for flag in obj.flags: + if flag not in flags: + if flag not in obj.optflags: + raise MissingFlag(flag, var_type) + else: + objflags[flag] = flags[flag] + + return obj(value, **objflags) + +def get_callable_args(obj): + """Grab all but the first argument of the specified callable, returning + the list, as well as a list of which of the arguments have default + values.""" + if type(obj) is type: + obj = obj.__init__ + + args, varargs, keywords, defaults = inspect.getargspec(obj) + flaglist = [] + if args: + if len(args) > 1 and args[0] == 'self': + args = args[1:] + flaglist.extend(args) + + optional = set() + if defaults: + optional |= set(flaglist[-len(defaults):]) + return flaglist, optional + +def factory_setup(name, obj): + """Prepare a factory for use.""" + args, optional = get_callable_args(obj) + extra_args = args[1:] + if extra_args: + obj.flags, optional = extra_args, optional + obj.optflags = set(optional) + else: + obj.flags = obj.optflags = () + + if not hasattr(obj, 'name'): + obj.name = name + +def register(name, factory): + """Register a type, given its name and a factory callable. + + Determines the required and optional flags from the factory's + arguments.""" + factory_setup(name, factory) + available_types[factory.name] = factory + + +# Register all our included types +for name in dir(types): + if name.startswith('_'): + continue + + obj = getattr(types, name) + if not callable(obj): + continue + + register(name, obj) |