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import unittest, sys
from peak.rules.core import *
x2 = lambda a: a*2
x3 = lambda next_method, a: next_method(a)*3
class TypeEngineTests(unittest.TestCase):
def testIntraSignatureCombinationAndRemoval(self):
abstract()
def f(a):
"""blah"""
rx2 = Rule(x2,(int,), Method)
rx3 = Rule(x3,(int,), Around)
rules_for(f).add(rx2)
self.assertEqual(f(1), 2)
rules_for(f).add(rx3)
self.assertEqual(f(1), 6)
rules_for(f).remove(rx3)
self.assertEqual(f(1), 2)
def testAroundDecoratorAndRetroactiveCombining(self):
def f(a):
return a
self.assertEqual(f(1), 1)
self.assertEqual(f('x'), 'x')
when(f, (int,))(x2)
self.assertEqual(f(1), 2)
self.assertEqual(f('x'), 'x')
around(f, (int,))(lambda a:42)
self.assertEqual(f(1), 42)
self.assertEqual(f('x'), 'x')
class MiscTests(unittest.TestCase):
def testPointers(self):
from peak.rules.indexing import IsObject
from sys import maxint
anOb = object()
ptr = IsObject(anOb)
self.assertEqual(id(anOb)&maxint,ptr)
self.assertEqual(hash(id(anOb)&maxint),hash(ptr))
self.assertEqual(ptr.match, True)
self.assertEqual(IsObject(anOb, False).match, False)
self.assertNotEqual(IsObject(anOb, False), ptr)
class X: pass
anOb = X()
ptr = IsObject(anOb)
oid = id(anOb)&maxint
self.assertEqual(oid,ptr)
self.assertEqual(hash(oid),hash(ptr))
del anOb
self.assertNotEqual(ptr,"foo")
self.assertEqual(ptr,ptr)
self.assertEqual(hash(oid),hash(ptr))
def testRuleSetReentrance(self):
from peak.rules.core import Rule, RuleSet
rs = RuleSet()
log = []
class MyListener:
def actions_changed(self, added, removed):
log.append(1)
if self is ml1:
rs.unsubscribe(ml2)
ml1, ml2 = MyListener(), MyListener()
rs.subscribe(ml1)
rs.subscribe(ml2)
self.assertEqual(log, [])
rs.add(Rule(lambda:None))
self.assertEqual(log, [1, 1])
def testAbstract(self):
def f1(x,y=None):
raise AssertionError("Should never get here")
d = Dispatching(f1)
log = []
d.rules.default_action = lambda *args: log.append(args)
f1 = abstract(f1)
f1(27,42)
self.assertEqual(log, [(27,42)])
when(f1, ())(lambda *args: 99)
self.assertRaises(AssertionError, abstract, f1)
def testAbstractRegeneration(self):
def f1(x,y=None):
raise AssertionError("Should never get here")
d = Dispatching(f1)
log = []
d.rules.default_action = lambda *args: log.append(args)
d.request_regeneration()
f1 = abstract(f1)
self.assertNotEqual(d.backup, f1.func_code)
self.assertEqual(f1.func_code, d._regen)
f1.func_code = d.backup
f1(27,42)
self.assertEqual(log, [(27,42)])
def testCreateEngine(self):
def f1(x,y=None):
raise AssertionError("Should never get here")
d = Dispatching(f1)
old_engine = d.engine
self.assertEqual(d.rules.listeners, [old_engine])
from peak.rules.core import TypeEngine
class MyEngine(TypeEngine): pass
d.create_engine(MyEngine)
new_engine = d.engine
self.assertNotEqual(new_engine, old_engine)
self.failUnless(isinstance(new_engine, MyEngine))
self.assertEqual(d.rules.listeners, [new_engine])
def testIndexClassicMRO(self):
class MyEngine: pass
eng = MyEngine()
from peak.rules.indexing import TypeIndex
from peak.rules.criteria import Class
from types import InstanceType
ind = TypeIndex(eng, 'classes')
ind.add_case(0, Class(MyEngine))
ind.add_case(1, Class(object))
ind.reseed(Class(InstanceType))
self.assertEqual(
dict(ind.expanded_sets()),
{MyEngine: [[0,1],[]], InstanceType: [[1],[]], object: [[1],[]]}
)
def testEngineArgnames(self):
argnames = lambda func: Dispatching(func).engine.argnames
self.assertEqual(
argnames(lambda a,b,c=None,*d,**e: None), list('abcde')
)
self.assertEqual(
argnames(lambda a,b,c=None,*d: None), list('abcd')
)
self.assertEqual(
argnames(lambda a,b,c=None,**e: None), list('abce')
)
self.assertEqual(
argnames(lambda a,b,c=None: None), list('abc')
)
self.assertEqual(
argnames(lambda a,(b,(c,d)), e: None), list('abcde')
)
def test_istype_implies(self):
self.failUnless(implies(istype(object), object))
self.failUnless(implies(istype(int), object))
self.failIf(implies(istype(object, False), object))
self.failIf(implies(istype(int, False), object))
def testIndexedEngine(self):
from peak.rules.predicates import IndexedEngine, Comparison
from peak.rules.criteria import Range, Value, Test, Signature
from peak.util.assembler import Local
from peak.util.extremes import Min, Max
abstract()
def classify(age): pass
Dispatching(classify).create_engine(IndexedEngine)
def setup(r, f):
when(classify, Signature([Test(Comparison(Local('age')), r)]))(f)
setup(Range(hi=( 2,-1)), lambda age:"infant")
setup(Range(hi=(13,-1)), lambda age:"preteen")
setup(Range(hi=( 5,-1)), lambda age:"preschooler")
setup(Range(hi=(20,-1)), lambda age:"teenager")
setup(Range(lo=(20,-1)), lambda age:"adult")
setup(Range(lo=(55,-1)), lambda age:"senior")
setup(Value(16), lambda age:"sweet sixteen")
self.assertEqual(classify(0),"infant")
self.assertEqual(classify(25),"adult")
self.assertEqual(classify(17),"teenager")
self.assertEqual(classify(13),"teenager")
self.assertEqual(classify(12.99),"preteen")
self.assertEqual(classify(4),"preschooler")
self.assertEqual(classify(55),"senior")
self.assertEqual(classify(54.9),"adult")
self.assertEqual(classify(14.5),"teenager")
self.assertEqual(classify(16),"sweet sixteen")
self.assertEqual(classify(16.5),"teenager")
self.assertEqual(classify(99),"senior")
self.assertEqual(classify(Min),"infant")
self.assertEqual(classify(Max),"senior")
def testSignatureOfTruthTests(self):
from peak.rules.predicates import Truth
from peak.rules.criteria import Test, Signature
# this line used to fail with a recursion error:
Signature([Test(Truth(99), True), Test(Truth(88), False)])
def testClassBodyRules(self):
from peak.rules.core import Local, Rule
from peak.rules.criteria import Signature, Test, Class, Value
from peak.rules.predicates import IsInstance, Truth
abstract()
def f1(a): pass
abstract()
def f2(b): pass
# This is to verify that the rules have sequence numbers by definition
# order, not reverse definition order, inside a class.
num = Rule(None).sequence
class T:
f1=sys._getframe(1).f_locals['f1'] # ugh
when(f1)
def f1_(a): pass
f2=sys._getframe(1).f_locals['f2']
when(f2, 'b')
def f2_(b): pass
self.assertEqual(
list(rules_for(f1)), [Rule(T.f1_.im_func, (T,), Method, num+1)]
)
self.assertEqual(
list(rules_for(f2)), [Rule(
T.f2_.im_func, Signature([
Test(IsInstance(Local('b')), Class(T)),
Test(Truth(Local('b')), Value(True))
]), Method, num+2)
]
)
def testParseInequalities(self):
from peak.rules.predicates import CriteriaBuilder, Comparison, Truth
from peak.util.assembler import Compare, Local
from peak.rules.criteria import Inequality, Test, Value
from peak.rules.ast_builder import parse_expr
builder = CriteriaBuilder(
dict(x=Local('x'), y=Local('y')), locals(), globals(), __builtins__
)
pe = builder.parse
x_cmp_y = lambda op, t=True: Test(
Truth(Compare(Local('x'), ((op, Local('y')),))), Value(True, t)
)
x,y = Comparison(Local('x')), Comparison(Local('y'))
for op, mirror_op, not_op, stdop, not_stdop in [
('>', '<', '<=','>','<='),
('<', '>', '>=','<','>='),
('==','==','!=','==','!='),
('<>','<>','==','!=','=='),
]:
fwd_sig = Test(x, Inequality(op, 1))
self.assertEqual(pe('x %s 1' % op), fwd_sig)
self.assertEqual(pe('1 %s x' % mirror_op), fwd_sig)
rev_sig = Test(x, Inequality(mirror_op, 1))
self.assertEqual(pe('x %s 1' % mirror_op), rev_sig)
self.assertEqual(pe('1 %s x' % op), rev_sig)
not_sig = Test(x, Inequality(not_op, 1))
self.assertEqual(pe('not x %s 1' % op), not_sig)
self.assertEqual(pe('not x %s 1' % not_op), fwd_sig)
self.assertEqual(pe('x %s y' % op), x_cmp_y(stdop))
self.assertEqual(pe('x %s y' % not_op), x_cmp_y(not_stdop))
self.assertEqual(pe('not x %s y' % op),x_cmp_y(stdop,False))
self.assertEqual(pe('not x %s y' % not_op),x_cmp_y(not_stdop,False))
def testInheritance(self):
class X: pass
class Y(X): pass
x = Y()
f = lambda x: "f"
when(f, "isinstance(x, X)")(lambda x: "g")
when(f, "type(x) is X")(lambda x: "h")
self.assertEqual(f(x), 'g')
def testNotInherited(self):
f = abstract(lambda x: "f")
when(f, "not isinstance(x, int)")(lambda x: "g")
when(f, "type(x) is object")(lambda x: "h")
self.assertEqual(f(None), 'g')
def testTypeImplicationAndIsSubclassOrdering(self):
from inspect import isclass
class A(object): pass
class B(A): pass
whats_this = abstract(lambda obj: obj)
when(whats_this, "isclass(obj) and issubclass(obj, A)")(lambda o:"A")
when(whats_this, "isclass(obj) and issubclass(obj, B)")(lambda o:"B")
when(whats_this, (B,))(lambda o:"B()")
when(whats_this, (A,))(lambda o:"A()")
self.failUnlessEqual(whats_this(B), "B")
self.failUnlessEqual(whats_this(A), "A")
self.failUnlessEqual(whats_this(B()), "B()")
self.failUnlessEqual(whats_this(A()), "A()")
def testRuleSetClear(self):
from peak.rules.core import Rule, RuleSet
rs = RuleSet(); r = Rule(lambda:None,actiontype=Method)
rs.add(r)
self.assertEqual(list(rs), [r])
rs.clear()
self.assertEqual(list(rs), [])
def testTypeEngineKeywords(self):
def func(x, **k): pass
def fstr(x,**k): return x,k
abstract(func)
when(func,(str,))(fstr)
self.assertEqual(func('x',s='7'), ('x',{'s':'7'}))
def testFlatPriorities(self):
from peak.rules import value, AmbiguousMethods
from peak.rules.predicates import priority
f = lambda n, m: 0
f1, f2, f3 = value(1), value(2), value(3)
when(f, "n==5 and priority(1)")(f1)
when(f, "m==5 and priority(1)")(f2)
when(f, "n==5 and m==5 and priority(1)")(f3)
self.assertEqual(f(5,5), 3)
def testIsNot(self):
def func(x): pass
p,q,r = object(),object(),object()
when(func,"x is not p")(value('~p'))
when(func,"x is not p and x is not q and x is not r")(value('nada'))
self.assertEqual(func(23),'nada')
self.assertEqual(func(q),'~p')
def testTypeVsIsTypePrecedence(self):
def func(x): pass
when(func, (int, ))(value(1))
when(func, (istype(int),))(value(2))
self.assertEqual(func(42), 2)
def testNamedGFExtension(self):
p,q,r = object(),object(),object()
when("%s:%s.named_func" % (__name__, self.__class__.__name__), "x is not p")(value('~p'))
self.assertEqual(self.named_func(q),'~p')
def named_func(x): pass
named_func = staticmethod(named_func)
class RuleDispatchTests(unittest.TestCase):
def testSimplePreds(self):
from peak.rules import dispatch
[dispatch.generic()]
def classify(age):
"""Stereotype for age"""
def defmethod(gf,s,func):
gf.when(s)(func)
defmethod(classify,'not not age<2', lambda age:"infant")
defmethod(classify,'age<13', lambda age:"preteen")
defmethod(classify,'age<5', lambda age:"preschooler")
defmethod(classify,'20>age', lambda age:"teenager")
defmethod(classify,'not age<20',lambda age:"adult")
defmethod(classify,'age>=55',lambda age:"senior")
defmethod(classify,'age==16',lambda age:"sweet sixteen")
self.assertEqual(classify(25),"adult")
self.assertEqual(classify(17),"teenager")
self.assertEqual(classify(13),"teenager")
self.assertEqual(classify(12.99),"preteen")
self.assertEqual(classify(0),"infant")
self.assertEqual(classify(4),"preschooler")
self.assertEqual(classify(55),"senior")
self.assertEqual(classify(54.9),"adult")
self.assertEqual(classify(14.5),"teenager")
self.assertEqual(classify(16),"sweet sixteen")
self.assertEqual(classify(16.5),"teenager")
self.assertEqual(classify(99),"senior")
self.assertEqual(classify(dispatch.strategy.Min),"infant")
self.assertEqual(classify(dispatch.strategy.Max),"senior")
def testKwArgHandling(self):
from peak.rules import dispatch
[dispatch.generic()]
def f(**fiz): """Test of kw handling"""
[f.when("'x' in fiz")]
def f(**fiz): return "x"
[f.when("'y' in fiz")]
def f(**fiz): return "y"
self.assertEqual(f(x=1),"x")
self.assertEqual(f(y=1),"y")
self.assertRaises(dispatch.AmbiguousMethod, f, x=1, y=1)
def testVarArgHandling(self):
from peak.rules import dispatch
[dispatch.generic()]
def f(*fiz): """Test of vararg handling"""
[f.when("'x' in fiz")]
def f(*fiz): return "x"
[f.when("'y' in fiz")]
def f(*fiz): return "y"
self.assertEqual(f("foo","x"),"x")
self.assertEqual(f("bar","q","y"),"y")
self.assertEqual(f("bar","q","y"),"y")
self.assertEqual(f("y","q",),"y")
self.assertRaises(dispatch.AmbiguousMethod, f, "x","y")
def test_NoApplicableMethods_is_raised(self):
from peak.rules import dispatch
[dispatch.generic()]
def demo_func(number):
pass
demo_func.when("number < 10")(lambda x: 0)
self.assertEqual(demo_func(3),0)
self.assertRaises(dispatch.NoApplicableMethods, demo_func, 33)
def testSingles(self):
from peak.rules import dispatch
[dispatch.on('t')]
def gm (t) : pass
[gm.when(object)]
def gm (t) : return 'default'
[gm.when(int)]
def gm2 (t) : return 'int'
self.assertEqual(gm(42),"int")
self.assertEqual(gm("x"),"default")
self.assertEqual(gm(42.0),"default")
def testSubclassDispatch(self):
from peak.rules import dispatch
[dispatch.generic()]
def gm (t) : pass
[gm.when(dispatch.strategy.default)]
def gm (t) : return 'default'
[gm.when('issubclass(t,int)')]
def gm2 (t) : return 'int'
self.assertEqual(gm(int),"int")
self.assertEqual(gm(object),"default")
self.assertEqual(gm(float),"default")
def testTrivialities(self):
from peak.rules import dispatch
[dispatch.on('x')]
def f1(x,*y,**z): "foo bar"
[dispatch.on('x')]
def f2(x,*y,**z): "baz spam"
for f,doc in (f1,"foo bar"),(f2,"baz spam"):
self.assertEqual(f.__doc__, doc)
# Empty generic should raise NoApplicableMethods
self.assertRaises(dispatch.NoApplicableMethods, f, 1, 2, 3)
self.assertRaises(dispatch.NoApplicableMethods, f, "x", y="z")
# Must have at least one argument to do dispatching
self.assertRaises(TypeError, f)
self.assertRaises(TypeError, f, foo="bar")
class MockBuilder:
def __init__(self, test, expr, cases, remaining, seeds, index=None):
self.test = test
self.args = expr, cases, remaining, {}
self.seeds = seeds
self.index = index
def test_func(self, func):
return func(self, *self.args)
def build(self, cases, remaining_exprs, memo):
self.test.failUnless(memo is self.args[-1])
self.test.assertEqual(self.args[-2], remaining_exprs)
return cases
def seed_bits(self, expr, cases):
self.test.assertEqual(self.args[1], cases)
if self.index is not None:
return self.index.seed_bits(cases)
return self.seeds
def reseed(self, expr, criterion):
self.test.assertEqual(self.args[0], expr)
self.index.reseed(criterion)
class NodeBuildingTests(unittest.TestCase):
def build(self, func, dontcare, seeds, index=None):
seedbits = dontcare, seeds
builder = MockBuilder(
self, 'expr', 'cases', 'remaining', seedbits, index
)
return builder.test_func(func)
def testTruthNode(self):
from peak.rules.predicates import truth_node
node = self.build(truth_node, 27,
{True: (128,0), False: (64,0)})
self.assertEqual(node, (27|128, 27|64))
def testIdentityNode(self):
from peak.rules.predicates import identity_node
node = self.build(identity_node, 27,
{9127: (128,0), 6499: (64,0), None: (0,0)})
self.assertEqual(node, {None:27, 9127:27|128, 6499: 27|64})
def testRangeNode(self):
from peak.rules.indexing import RangeIndex, to_bits
from peak.rules.predicates import range_node
from peak.rules.criteria import Range, Value, Min, Max
ind = RangeIndex(self, 'expr')
ind.add_case(0, Value(19))
ind.add_case(1, Value(23))
ind.add_case(2, Value(23, False))
ind.add_case(3, Range(lo=(57,1)))
ind.add_case(4, Range(lo=(57,-1)))
dontcare, seeds = ind.seed_bits(to_bits(range(6)))
exact, ranges = self.build(range_node, dontcare, seeds)
self.assertEqual(exact,
{19:to_bits([0, 2, 5]), 23:to_bits([1,5]), 57:to_bits([2,4,5])})
self.assertEqual(ranges,
[((Min,57), to_bits([2,5])), ((57,Max), to_bits([2,3,4,5]))])
def testClassNode(self):
from peak.rules.indexing import TypeIndex, to_bits
from peak.rules.predicates import class_node
from peak.rules.criteria import Class, Conjunction
from types import InstanceType
ind = TypeIndex(self, 'expr')
class a: pass
class b: pass
class c(a,b): pass
class x(a,b,object): pass
ind.add_case(0, Class(InstanceType))
ind.add_case(1, Conjunction([Class(a), Class(b), Class(c,False)]))
ind.add_case(2, Class(object))
ind.add_case(3, Conjunction([Class(a), Class(b)]))
ind.add_case(4, Class(a))
ind.selectivity(range(6))
cases = to_bits(range(6))
builder = MockBuilder(
self, 'expr', cases, 'remaining', ind.seed_bits(cases), ind
)
cache, lookup = builder.test_func(class_node,)
self.assertEqual(cache, {})
data = [
(object, to_bits([2,5])),
(InstanceType, to_bits([0,2,5])),
(a, to_bits([0,2,4,5])),
(b, to_bits([0,2,5])),
(c, to_bits([0,2,3,4,5])),
(x, to_bits([1,2,3,4,5]))
]
for k, v in data:
self.assertEqual(lookup(k), v)
self.assertEqual(cache, dict(data))
class DecompilationTests(unittest.TestCase):
def setUp(self):
from peak.rules.ast_builder import parse_expr
from peak.rules.codegen import ExprBuilder
from peak.util.assembler import Local, Const
from peak.rules.debug.decompile import decompile
class Const(Const): pass # non-folding
class ExprBuilder(ExprBuilder):
def Const(self,value): return Const(value)
argmap = dict([(name,Local(name)) for name in 'abcdefgh'])
builder = ExprBuilder(argmap, locals(), globals(), __builtins__)
self.parse = builder.parse
self.decompile = decompile
def roundtrip(self, s1, s2=None):
if s2 is None:
s2 = s1
self.check(self.parse(s1), s2)
def check(self, expr, s):
self.assertEqual(self.decompile(expr), s)
def test_basics(self):
from peak.util.assembler import Pass, Getattr, Local
self.check(Pass, '')
self.check(Getattr(Local('a'), 'b'), 'a.b')
self.roundtrip('not -+~`a`')
self.roundtrip('a+b-c*d/e%f**g//h')
self.roundtrip('a and b or not c')
self.roundtrip('~a|b^c&d<<e>>f')
self.roundtrip('(a, b)')
self.roundtrip('[a, b]')
self.roundtrip('[a]')
self.roundtrip('[]')
self.roundtrip('()')
self.roundtrip('1')
self.roundtrip('a.b.c')
# TODO: Compare
def test_slices(self):
self.roundtrip('a[:]')
self.roundtrip('a[1:]')
self.roundtrip('a[:2]')
self.roundtrip('a[1:2]')
self.roundtrip('a[1:2:3]')
self.roundtrip('a[::]', 'a[:]')
self.roundtrip('a[b:c:d]')
self.roundtrip('a[b::d]')
self.roundtrip('a[-b:c+d:e*f]')
self.roundtrip('a[::d]')
def test_paren_precedence(self):
self.roundtrip('(1).__class__')
self.roundtrip('1.2.__class__')
self.roundtrip('`(a, b)`')
self.roundtrip('`a,b`', '`(a, b)`')
self.roundtrip('(a, [b, c])')
self.roundtrip('a,b', '(a, b)')
self.roundtrip('a+b*c')
self.roundtrip('c*(a+b)')
self.roundtrip('a*b*c')
self.roundtrip('(a*b)*c', 'a*b*c')
self.roundtrip('a*(b*c)')
self.roundtrip('(a*b).c')
self.roundtrip('(a, b, c)')
self.roundtrip('a**b**c')
self.roundtrip('a**(b**c)', 'a**b**c')
self.roundtrip('a and b or c and not d')
self.roundtrip('a and (b or c) and not d')
if sys.version>='2.5':
# if-else is right-associative
self.roundtrip('(a, b, c) if d else e')
self.roundtrip('(a if b else c) if d else e')
self.roundtrip('a if (b if c else d) else e')
self.roundtrip('a if b else (c if d else e)',
'a if b else c if d else e')
def test_powers(self):
# Exponentiation operator binds less tightly than unary numeric/bitwise
# on the right:
self.roundtrip('2**-1')
self.roundtrip('2**+1')
self.roundtrip('2**~1')
self.roundtrip('2**1*2')
self.roundtrip('2**(1*2)')
def test_dicts(self):
self.roundtrip('{}')
self.roundtrip('{a: b}')
self.roundtrip('{a: b, c: d}')
def test_calls(self):
self.roundtrip('1()')
self.roundtrip('a()')
self.roundtrip('a(b)')
self.roundtrip('a(c=d)')
self.roundtrip('a(*e)')
self.roundtrip('a(**f)')
self.roundtrip('a(b, c=d, *e, **f)')
self.roundtrip('a.b(c)')
self.roundtrip('a+b(c)')
self.roundtrip('(a+b)(c)')
if sys.version>='2.5':
self.roundtrip('a if b(c) else d')
self.roundtrip('a(b if c else d, *e if f else g)')
def additional_tests():
import doctest
files = [
'README.txt', 'DESIGN.txt', 'Indexing.txt', 'AST-Builder.txt',
'Code-Generation.txt', 'Syntax-Matching.txt', 'Criteria.txt',
'Predicates.txt',
][sys.version<'2.4':] # skip README.txt on 2.3 due to @ syntax
return doctest.DocFileSuite(
optionflags=doctest.ELLIPSIS|doctest.NORMALIZE_WHITESPACE,
globs=dict(__name__=None), # workaround PyPy type repr() issue 1292
*files
)
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