/usr/share/pyshared/ometa/test/test_protocol.py is in python-parsley 1.2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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from twisted.trial import unittest
from ometa.protocol import ParserProtocol
except ImportError:
import unittest
skip = "twisted not installed or usable"
else:
skip = None
from ometa.grammar import OMeta
from ometa.runtime import ParseError
testingGrammarSource = """
someA = ('a' 'a') -> receiver('a')
someB = ('b' 'b') -> receiver('b')
someC = ('c' 'c') -> receiver('c')
someExc = 'e' -> receiver.raiseSomething()
initial = someA | someExc
"""
testGrammar = OMeta(testingGrammarSource).parseGrammar('testGrammar')
class SenderFactory(object):
def __init__(self, transport):
self.transport = transport
class SomeException(Exception):
pass
class ReceiverFactory(object):
currentRule = 'initial'
def __init__(self, sender):
self.sender = sender
self.calls = []
self.returnMap = {}
self.connected = False
self.lossReason = None
self.parser = None
def prepareParsing(self, parser):
self.connected = True
self.parser = parser
def __call__(self, v):
self.calls.append(v)
if v in self.returnMap:
self.currentRule = self.returnMap[v]
def raiseSomething(self):
raise SomeException()
def finishParsing(self, reason):
self.lossReason = reason
class FakeTransport(object):
def __init__(self):
self.aborted = False
def abortConnection(self):
self.aborted = True
class ParserProtocolTestCase(unittest.TestCase):
skip = skip
def setUp(self):
self.protocol = ParserProtocol(
testGrammar, SenderFactory, ReceiverFactory, {})
def test_transportPassed(self):
"""The sender is passed the transport recieved by the protocol."""
transport = object()
self.protocol.makeConnection(transport)
self.assertEqual(transport, self.protocol.sender.transport)
def test_senderPassed(self):
"""The sender is passed to the receiver."""
self.protocol.makeConnection(None)
self.assertEqual(self.protocol.sender, self.protocol.receiver.sender)
def test_parserPassed(self):
"""The parser is passed in the prepareParsing method."""
self.protocol.makeConnection(None)
self.assertEqual(self.protocol, self.protocol.receiver.parser)
def test_connectionEstablishes(self):
"""prepareParsing is called on the receiver after connection establishment."""
self.protocol.makeConnection(None)
self.assert_(self.protocol.receiver.connected)
def test_basicParsing(self):
"""Rules can be parsed multiple times for the same effect."""
self.protocol.makeConnection(None)
self.protocol.dataReceived('aa')
self.assertEqual(self.protocol.receiver.calls, ['a'])
self.protocol.dataReceived('aa')
self.assertEqual(self.protocol.receiver.calls, ['a', 'a'])
def test_parsingChunks(self):
"""Any number of rules can be called from one dataRecived."""
self.protocol.makeConnection(None)
self.protocol.dataReceived('a')
self.assertEqual(self.protocol.receiver.calls, [])
self.protocol.dataReceived('aa')
self.assertEqual(self.protocol.receiver.calls, ['a'])
self.protocol.dataReceived('aaa')
self.assertEqual(self.protocol.receiver.calls, ['a', 'a', 'a'])
def test_ruleSwitching(self):
"""The rule being parsed can specify the next rule to be parsed."""
self.protocol.makeConnection(None)
self.protocol.receiver.returnMap.update(dict(a='someB', b='someA'))
self.protocol.dataReceived('aa')
self.assertEqual(self.protocol.receiver.calls, ['a'])
self.protocol.dataReceived('bb')
self.assertEqual(self.protocol.receiver.calls, ['a', 'b'])
self.protocol.dataReceived('aa')
self.assertEqual(self.protocol.receiver.calls, ['a', 'b', 'a'])
def test_ruleSwitchingWithChunks(self):
"""Any number of rules can be called even during rule switching."""
self.protocol.makeConnection(None)
self.protocol.receiver.returnMap.update(dict(a='someB', b='someA'))
self.protocol.dataReceived('a')
self.assertEqual(self.protocol.receiver.calls, [])
self.protocol.dataReceived('ab')
self.assertEqual(self.protocol.receiver.calls, ['a'])
self.protocol.dataReceived('baa')
self.assertEqual(self.protocol.receiver.calls, ['a', 'b', 'a'])
def test_rulesCannotBeSwitchedDuringParsing(self):
"""
One can set a new rule during parsing, but it won't change the rule
currently being parsed.
"""
self.protocol.makeConnection(None)
self.protocol.dataReceived('aa')
self.assertEqual(self.protocol.receiver.calls, ['a'])
self.protocol.dataReceived('a')
self.assertEqual(self.protocol.receiver.calls, ['a'])
self.protocol.receiver.currentRule = 'someC'
self.protocol.dataReceived('acc')
self.assertEqual(self.protocol.receiver.calls, ['a', 'a', 'c'])
def test_connectionLoss(self):
"""The reason for connection loss is forwarded to the receiver."""
self.protocol.makeConnection(None)
reason = object()
self.protocol.connectionLost(reason)
self.assertEqual(self.protocol.receiver.lossReason, reason)
def test_parseFailure(self):
"""
Parse failures cause connection abortion with the parse error as the
reason.
"""
transport = FakeTransport()
self.protocol.makeConnection(transport)
self.protocol.dataReceived('b')
self.failIfEqual(self.protocol.receiver.lossReason, None)
self.failUnlessIsInstance(self.protocol.receiver.lossReason.value,
ParseError)
self.assert_(transport.aborted)
def test_exceptionsRaisedFromReceiver(self):
"""
Raising an exception from receiver methods called from the grammar
propagate to finishParsing.
"""
transport = FakeTransport()
self.protocol.makeConnection(transport)
self.protocol.dataReceived('e')
self.failIfEqual(self.protocol.receiver.lossReason, None)
self.failUnlessIsInstance(self.protocol.receiver.lossReason.value,
SomeException)
self.assert_(transport.aborted)
def test_dataIgnoredAfterDisconnection(self):
"""After connectionLost is called, all incoming data is ignored."""
transport = FakeTransport()
self.protocol.makeConnection(transport)
reason = object()
self.protocol.connectionLost(reason)
self.protocol.dataReceived('d')
self.assertEqual(self.protocol.receiver.lossReason, reason)
self.assert_(not transport.aborted)
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