def test_parsing_with_no_localized_grammars(self):
mgr = EvaluableParseManager(self.symbol_table, Grammar())
parse_tree1 = mgr.parse('message == "2009-07-13"')
parse_tree2 = mgr.parse('message == "2009-07-13"', None)
expected_tree = EvaluableParseTree(
Equal(String("Hello world"), String("2009-07-13")))
eq_(parse_tree1, parse_tree2)
eq_(parse_tree1, expected_tree)
def test_operand(self):
"""Operands alone can valid evaluable parse trees."""
operand = TrafficLightVar()
tree = EvaluableParseTree(operand)
# True
context = {'traffic_light': "red"}
ok_(tree(context))
# False
context = {'traffic_light': None}
assert_false(tree(context))
def test_parsing_with_localized_grammars(self):
castilian_grammar = Grammar(decimal_separator=",",
thousands_separator=".")
mgr = EvaluableParseManager(self.symbol_table,
Grammar(),
es=castilian_grammar)
parse_tree = mgr.parse(u"tráfico:peatones_cruzando_calle <= 3,00",
"es")
expected_tree = EvaluableParseTree(
LessEqual(PedestriansCrossingRoad(), Number(3.0)))
eq_(parse_tree, expected_tree)
def test_adding_grammar(self):
"""It should be possible to add grammars after instantiation."""
castilian_grammar = Grammar(decimal_separator=",",
thousands_separator=".")
mgr = EvaluableParseManager(self.symbol_table, Grammar())
mgr.add_parser("es", castilian_grammar)
parse_tree = mgr.parse(u'tráfico:peatones_cruzando_calle <= 3,00',
"es")
expected_tree = EvaluableParseTree(
LessEqual(PedestriansCrossingRoad(), Number(3.0)))
eq_(parse_tree, expected_tree)
def test_equivalence(self):
tree1 = EvaluableParseTree(BoolVar())
tree2 = EvaluableParseTree(BoolVar())
tree3 = EvaluableParseTree(PedestriansCrossingRoad())
tree4 = ConvertibleParseTree(PlaceholderVariable("my_variable"))
ok_(tree1 == tree2)
ok_(tree2 == tree1)
ok_(tree1 != None)
ok_(tree1 != tree3)
ok_(tree1 != tree4)
ok_(tree2 != tree3)
ok_(tree2 != tree4)
ok_(tree3 != tree1)
ok_(tree3 != tree2)
ok_(tree3 != tree4)
ok_(tree4 != tree1)
ok_(tree4 != tree2)
ok_(tree4 != tree3)
def test_operation(self):
"""Operations are valid evaluable parse trees."""
operation = And(PedestriansCrossingRoad(),
DriversAwaitingGreenLightVar())
tree = EvaluableParseTree(operation)
# True
context = {'pedestrians_crossroad': ("gustavo", "carla"),
'drivers_trafficlight': ("andreina", "juan")}
ok_(tree(context))
# False
context = {'pedestrians_crossroad': (),
'drivers_traffic_light': ()}
assert_false(tree(context))
def test_parsing_with_defined_grammar_but_no_available_translations(self):
"""
When an expression is written in an supported grammar but there are no
translated bindings, the default names must be used along with the
custom grammar.
"""
french_grammar = Grammar(decimal_separator=",",
thousands_separator=".")
mgr = EvaluableParseManager(self.symbol_table,
Grammar(),
fr=french_grammar)
# French grammar is not supported:
parse_tree = mgr.parse("traffic:pedestrians_crossing_road <= 3,0",
"fr")
expected_tree = EvaluableParseTree(
LessEqual(PedestriansCrossingRoad(), Number(3)))
eq_(parse_tree, expected_tree)
def test_parsing_with_undefined_grammar_but_available_translations(self):
"""
When an expression is written in an unsupported grammar, a parser
based on the generic grammar must be created and used.
The respective translated bindings must be used if available.
"""
log_handler = LoggingHandlerFixture()
mgr = EvaluableParseManager(self.symbol_table, Grammar())
# Castilian grammar is not supported:
parse_tree = mgr.parse(u"tráfico:peatones_cruzando_calle <= 3.0", "es")
expected_tree = EvaluableParseTree(
LessEqual(PedestriansCrossingRoad(), Number(3)))
eq_(parse_tree, expected_tree)
# Checking the log:
info = "Generated parser for unknown grammar 'es'"
ok_(info in log_handler.handler.messages['info'])
log_handler.undo()
def test_parsing_with_undefined_grammar_and_no_translated_bindings(self):
"""
When an expression is written in an unsupported grammar, a parser
based on the generic grammar must be created and used.
If there are no translated bindings, the default names must be used.
"""
log_handler = LoggingHandlerFixture()
mgr = EvaluableParseManager(self.symbol_table, Grammar())
# French grammar is not supported:
parse_tree = mgr.parse("traffic:pedestrians_crossing_road <= 3.0",
"fr")
expected_tree = EvaluableParseTree(
LessEqual(PedestriansCrossingRoad(), Number(3)))
eq_(parse_tree, expected_tree)
# Checking the log:
info = "Generated parser for unknown grammar %s" % repr('fr')
ok_(info in log_handler.handler.messages['info'])
log_handler.undo()
def test_equivalence(self):
tree1 = ConvertibleParseTree(PlaceholderVariable("my_variable"))
tree2 = ConvertibleParseTree(PlaceholderVariable("my_variable"))
tree3 = ConvertibleParseTree(String("hello"))
tree4 = EvaluableParseTree(BoolVar())
ok_(tree1 == tree2)
ok_(tree2 == tree1)
ok_(tree1 != None)
ok_(tree1 != tree3)
ok_(tree1 != tree4)
ok_(tree2 != tree3)
ok_(tree2 != tree4)
ok_(tree3 != tree1)
ok_(tree3 != tree2)
ok_(tree3 != tree4)
ok_(tree4 != tree1)
ok_(tree4 != tree2)
ok_(tree4 != tree3)
def test_representation(self):
tree = EvaluableParseTree(BoolVar())
expected = "<Parse tree (evaluable) <Anonymous variable [BoolVar]>>"
eq_(repr(tree), expected)
def test_string(self):
tree = EvaluableParseTree(BoolVar())
as_unicode = unicode(tree)
expected = "Evaluable parse tree (Anonymous variable [BoolVar])"
eq_(as_unicode, expected)