def _read_float(self, reader):
start = reader.get_cursor()
result = ""
while reader.can_read():
char = reader.peek()
if char == ".":
reader.skip()
if reader.can_read() and reader.peek() == ".":
break
result += char
elif char.isdigit() or char == "+" or char == "-":
reader.skip()
result += char
else:
break
if not result:
raise BuiltInExceptions.reader_expected_float(
).create_with_context(reader)
# Verify result is a valid float
try:
return float(result)
except ValueError:
reader.set_cursor(start)
raise BuiltInExceptions.reader_invalid_float().create_with_context(
reader, result)
def parse_nodes(self, node, original_reader, context_so_far):
source = context_so_far.get_source()
errors = None
potentials = None
cursor = original_reader.get_cursor()
for child in node.get_relevant_nodes(original_reader):
if not child.can_use(source):
continue
context = context_so_far.copy()
reader = StringReader(original_reader)
try:
try:
child.parse(reader, context)
# TODO: check if this one's appropriate
except RuntimeError as e:
raise BuiltInExceptions.dispatcher_parse_expection(
).create_with_context(reader, e)
if reader.can_read():
if reader.peek() != ARGUMENT_SEPARATOR_CHAR:
raise BuiltInExceptions.dispatcher_expected_argument_separator(
).create_with_context(reader)
except CommandSyntaxException as e:
if errors is None:
errors = {}
errors[child] = e
reader.set_cursor(cursor)
continue
context.with_command(child.get_command())
if reader.can_read(2 if child.get_redirect() is None else 1):
reader.skip()
if child.get_redirect() is not None:
child_context = CommandContextBuilder(
self, source, child.get_redirect(),
reader.get_cursor())
parse = self.parse_nodes(child.get_redirect(), reader,
child_context)
context.with_child(parse.get_context())
return ParseResult(context, parse.get_reader(),
parse.get_exceptions())
else:
parse = self.parse_nodes(child, reader, context)
if potentials is None:
potentials = []
potentials.append(parse)
else:
if potentials is None:
potentials = []
potentials.append(ParseResult(context, reader, {}))
if potentials:
potentials.sort(key=functools.cmp_to_key(potentials_cmp))
return potentials[0]
return ParseResult(context_so_far, original_reader,
{} if errors is None else errors)
def parse(self, reader):
start = reader.get_cursor()
result = reader.read_double()
if result < self.minimum:
reader.set_cursor(start)
raise BuiltInExceptions.float_too_low().create_with_context(reader, result, self.minimum)
if result > self.minimum:
reader.set_cursor(start)
raise BuiltInExceptions.float_too_high().create_with_context(reader, result, self.maximum)
return result
def read_int(self):
start = self.cursor
while self.can_read() and self.is_allowed_number(self.peek()):
self.skip()
number = self.string[start:self.cursor]
if not number:
raise BuiltInExceptions.reader_expected_int().create_with_context(self)
try:
return int(number)
except ValueError:
self.cursor = start
raise BuiltInExceptions.reader_invalid_int().create_with_context(self, number)
def read_boolean(self):
start = self.cursor
value = self.read_unquoted_string()
if not value:
raise BuiltInExceptions.reader_expected_bool().create_with_context(self)
if value == "true":
return True
elif value == "false":
return False
else:
self.cursor = start
raise BuiltInExceptions.reader_invalid_bool().create_with_context(self, value)
def parse(self, reader, context_builder):
start = reader.get_cursor()
end = self.__parse(reader)
if end > -1:
context_builder.with_node(self, between(start, end))
return
raise BuiltInExceptions.literal_incorrect().create_with_context(
reader, self.literal)
def test_execute_incorrect_literal():
subject = CommandDispatcher()
subject.register(literal("foo").executes(command).then(literal("bar")))
try:
subject.execute("foo baz", {})
except CommandSyntaxException as error:
assert error.get_type() == BuiltInExceptions.dispatcher_unknown_argument()
assert error.get_cursor() == 4
def test_execute_empty_command():
subject = CommandDispatcher()
subject.register(literal(""))
try:
subject.execute("", {})
except CommandSyntaxException as error:
assert error.get_type() == BuiltInExceptions.dispatcher_unknown_command()
assert error.get_cursor() == 0
def test_execute_impermissible_command():
subject = CommandDispatcher()
subject.register(literal("foo").requires(lambda _: False))
try:
subject.execute("foo", {})
except CommandSyntaxException as error:
assert error.get_type() == BuiltInExceptions.dispatcher_unknown_command()
assert error.get_cursor() == 0
def read_string_until(self, terminator):
result = ""
escaped = False
while self.can_read():
char = self.read()
if escaped:
if char == terminator or char == self.SYNTAX_ESCAPE:
result += char
else:
self.set_cursor(self.get_cursor() - 1)
raise BuiltInExceptions.reader_invalid_escape().create_with_context(self, str(char))
elif char == self.SYNTAX_ESCAPE:
escaped = True
elif char == terminator:
return result
else:
result += char
raise BuiltInExceptions.reader_expected_end_of_quote().create_with_context(self)
def read_quoted_string(self):
if not self.can_read():
return ""
next_char = self.peek()
if not self.is_quoted_string_start(next_char):
raise BuiltInExceptions.reader_expected_start_of_quote().create_with_context(self)
self.skip()
return self.read_string_until(next_char)
def execute_preparsed(self, parse):
if parse.get_reader().can_read():
if len(parse.get_exceptions()) == 1:
raise list(parse.get_exceptions().values())[0]
elif not parse.get_context().get_range():
raise BuiltInExceptions.dispatcher_unknown_command(
).create_with_context(parse.get_reader())
else:
raise BuiltInExceptions.dispatcher_unknown_argument(
).create_with_context(parse.get_reader())
result = 0
successful_forks = 0
forked = False
found_command = False
command = parse.get_reader().get_string()
original = parse.get_context().build(command)
contexts = [original]
_next = None
while contexts is not None:
for context in contexts:
child = context.get_child()
if child is not None:
forked |= context.is_forked()
if child.has_nodes():
found_command = True
modifier = context.get_redirect_modifier()
if modifier is None:
if _next is None:
_next = []
_next.append(child.copy_for(context.get_source()))
else:
try:
results = modifier(context)
if results:
if _next is None:
_next = []
for source in results:
_next.append(child.copy_for(source))
except CommandSyntaxException as e:
self.consumer.on_command_complete(
context, False, 0)
if not forked:
raise e
elif context.get_command() is not None:
found_command = True
try:
value = context.get_command()(context)
result += value if value else 1
self.consumer.on_command_complete(context, True, value)
successful_forks += 1
except CommandSyntaxException as e:
self.consumer.on_command_complete(context, False, 0)
if not forked:
raise e
contexts = _next
_next = None
if not found_command:
self.consumer.on_command_complete(original, False, 0)
raise BuiltInExceptions.dispatcher_unknown_command(
).create_with_context(parse.get_reader())
return successful_forks if forked else result
def expect(self, char):
if not self.can_read() or self.peek() != char:
raise BuiltInExceptions.reader_expected_symbol().create_with_context(self, str(char))
self.skip()
