[oe-commits] Chris Larson : Implement variable typing
git version control
git at git.openembedded.org
Fri Apr 22 17:52:27 UTC 2011
Module: openembedded.git
Branch: shr/testing2011.1
Commit: 78810c941391ae4b155b02818193e971f0d5a7c0
URL: http://gitweb.openembedded.net/?p=openembedded.git&a=commit;h=78810c941391ae4b155b02818193e971f0d5a7c0
Author: Chris Larson <chris_larson at mentor.com>
Date: Tue Nov 9 14:48:13 2010 -0700
Implement variable typing
This implementation consists of two components:
- oe.types python module, whose job it is to construct objects of the defined
type for a given variable in the metadata
- typecheck.bbclass, which iterates over all configuration variables with a
type defined and uses oe.types to check the validity of the values
This gives us a few benefits:
- Automatic sanity checking of all configuration variables with a defined type
- Avoid duplicating the "how do I make use of the value of this variable"
logic between its users. For variables like PATH, this is simply a split(),
for boolean variables, the duplication can result in confusing, or even
mismatched semantics (is this 0/1, empty/nonempty, what?)
- Make it easier to create a configuration UI, as the type information could
be used to provide a better interface than a text edit box (e.g checkbox for
'boolean', dropdown for 'choice')
This functionality is entirely opt-in right now. To enable the configuration
variable type checking, simply INHERIT += "typecheck". Example of a failing
type check:
BAZ = "foo"
BAZ[type] = "boolean"
$ bitbake -p
FATAL: BAZ: Invalid boolean value 'foo'
$
Examples of leveraging oe.types in a python snippet:
PACKAGES[type] = "list"
python () {
import oe.types
for pkg in oe.types.value("PACKAGES", d):
bb.note("package: %s" % pkg)
}
LIBTOOL_HAS_SYSROOT = "yes"
LIBTOOL_HAS_SYSROOT[type] = "boolean"
python () {
import oe.types
assert(oe.types.value("LIBTOOL_HAS_SYSROOT", d) == True)
}
Signed-off-by: Chris Larson <chris_larson at mentor.com>
---
classes/typecheck.bbclass | 12 ++++++
lib/oe/_types.py | 59 +++++++++++++++++++++++++++
lib/oe/test_types.py | 56 ++++++++++++++++++++++++++
lib/oe/types.py | 97 +++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 224 insertions(+), 0 deletions(-)
diff --git a/classes/typecheck.bbclass b/classes/typecheck.bbclass
new file mode 100644
index 0000000..646cd4e
--- /dev/null
+++ b/classes/typecheck.bbclass
@@ -0,0 +1,12 @@
+# Check types of bitbake configuration variables
+#
+# See oe.types for details.
+
+python check_types() {
+ import oe.types
+ if isinstance(e, bb.event.ConfigParsed):
+ for key in e.data.keys():
+ if e.data.getVarFlag(key, "type"):
+ oe.types.value(key, e.data)
+}
+addhandler check_types
diff --git a/lib/oe/_types.py b/lib/oe/_types.py
new file mode 100644
index 0000000..91afb8a
--- /dev/null
+++ b/lib/oe/_types.py
@@ -0,0 +1,59 @@
+import re
+
+class OEList(list):
+ name = "list"
+
+ def __init__(self, value, separator = None):
+ if value is not None:
+ list.__init__(self, value.split(separator))
+ else:
+ list.__init__(self)
+
+ if separator is None:
+ self.separator = " "
+ else:
+ self.separator = separator
+
+ def __str__(self):
+ return self.separator.join(self)
+
+def choice(value, choices):
+ if not isinstance(value, basestring):
+ raise TypeError("choice accepts a string, not '%s'" % type(value))
+
+ value = value.lower()
+ choices = choices.lower()
+ if value not in choices.split():
+ raise ValueError("Invalid choice '%s'. Valid choices: %s" %
+ (value, choices))
+ return value
+
+def regex(value, regexflags=None):
+ flagval = 0
+ if regexflags:
+ for flag in regexflags.split():
+ flag = flag.upper()
+ try:
+ flagval |= getattr(re, flag)
+ except AttributeError:
+ raise ValueError("Invalid regex flag '%s'" % flag)
+
+ try:
+ return re.compile(value, flagval)
+ except re.error, exc:
+ raise ValueError("Invalid regex value '%s': %s" %
+ (value, exc.args[0]))
+
+def boolean(value):
+ if not isinstance(value, basestring):
+ raise TypeError("boolean accepts a string, not '%s'" % type(value))
+
+ value = value.lower()
+ if value in ('yes', 'y', 'true', 't', '1'):
+ return True
+ elif value in ('no', 'n', 'false', 'f', '0'):
+ return False
+ raise ValueError("Invalid boolean value '%s'" % value)
+
+def integer(value):
+ return int(value)
diff --git a/lib/oe/test_types.py b/lib/oe/test_types.py
new file mode 100644
index 0000000..494abfa
--- /dev/null
+++ b/lib/oe/test_types.py
@@ -0,0 +1,56 @@
+import unittest
+from oe.types import create, factory
+
+class TestTypes(unittest.TestCase):
+ def assertIsInstance(self, obj, cls):
+ return self.assertTrue(isinstance(obj, cls))
+
+ def assertIsNot(self, obj, other):
+ return self.assertFalse(obj is other)
+
+ def assertFactoryCreated(self, value, type, **flags):
+ obj = factory(type)
+ self.assertIsNot(obj, None)
+ self.assertIsInstance(create(value, type, **flags), obj)
+
+class TestBooleanType(TestTypes):
+ def test_boolean(self):
+ self.assertRaises(ValueError, create, '', 'boolean')
+ self.assertRaises(ValueError, create, 'foo', 'boolean')
+ self.assertRaises(TypeError, create, object(), 'boolean')
+
+ def test_boolean_true(self):
+ self.assertEqual(create('y', 'boolean'), True)
+ self.assertEqual(create('yes', 'boolean'), True)
+ self.assertEqual(create('1', 'boolean'), True)
+ self.assertEqual(create('t', 'boolean'), True)
+ self.assertEqual(create('true', 'boolean'), True)
+ self.assertEqual(create('TRUE', 'boolean'), True)
+ self.assertEqual(create('truE', 'boolean'), True)
+
+ def test_boolean_false(self):
+ self.assertEqual(create('n', 'boolean'), False)
+ self.assertEqual(create('no', 'boolean'), False)
+ self.assertEqual(create('0', 'boolean'), False)
+ self.assertEqual(create('f', 'boolean'), False)
+ self.assertEqual(create('false', 'boolean'), False)
+ self.assertEqual(create('FALSE', 'boolean'), False)
+ self.assertEqual(create('faLse', 'boolean'), False)
+
+class TestList(TestTypes):
+ def assertListEqual(self, value, valid, sep=None):
+ obj = create(value, 'list', separator=sep)
+ self.assertEqual(obj, valid)
+ if sep is not None:
+ self.assertEqual(obj.separator, sep)
+ self.assertEqual(str(obj), obj.separator.join(obj))
+
+ def test_list_nosep(self):
+ testlist = ['alpha', 'beta', 'theta']
+ self.assertListEqual('alpha beta theta', testlist)
+ self.assertListEqual('alpha beta\ttheta', testlist)
+ self.assertListEqual('alpha', ['alpha'])
+
+ def test_list_usersep(self):
+ self.assertListEqual('foo:bar', ['foo', 'bar'], ':')
+ self.assertListEqual('foo:bar:baz', ['foo', 'bar', 'baz'], ':')
diff --git a/lib/oe/types.py b/lib/oe/types.py
new file mode 100644
index 0000000..963e964
--- /dev/null
+++ b/lib/oe/types.py
@@ -0,0 +1,97 @@
+# Constructs objects of the specified type for a given variable in the
+# metadata. The 'type' flag of the variable defines which of the factory
+# functions in this module will be called.
+#
+# If no type is defined, the value() function will simply return the expanded
+# string value as is.
+
+import bb
+import inspect
+import _types
+
+types = {}
+
+class MissingFlag(TypeError):
+ 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):
+ try:
+ return types[var_type]
+ except KeyError:
+ raise TypeError("Invalid type '%s'" % var_type)
+
+def create(value, var_type, **flags):
+ 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 value(key, d):
+ """Construct a value for a metadata variable, based upon its flags"""
+
+ var_type = d.getVarFlag(key, 'type')
+ flags = d.getVarFlags(key)
+
+ try:
+ return create(d.getVar(key, True) or '', var_type, **flags)
+ except (TypeError, ValueError), exc:
+ bb.fatal("%s: %s" % (key, str(exc)))
+
+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 by oe.types"""
+ 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):
+ factory_setup(name, factory)
+ types[factory.name] = factory
+
+# Set the 'flags' and 'optflags' attributes of all our types
+for name in dir(_types):
+ if name.startswith('_'):
+ continue
+
+ obj = getattr(_types, name)
+ if not callable(obj):
+ continue
+
+ register(name, obj)
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