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# Copyright 2023 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from bumble import core
class AtParsingError(core.InvalidPacketError):
"""Error raised when parsing AT commands fails."""
def tokenize_parameters(buffer: bytes) -> list[bytes]:
"""Split input parameters into tokens.
Removes space characters outside of double quote blocks:
T-rec-V-25 - 5.2.1 Command line general format: "Space characters (IA5 2/0)
are ignored [..], unless they are embedded in numeric or string constants"
Raises AtParsingError in case of invalid input string."""
tokens = []
in_quotes = False
token = bytearray()
for b in buffer:
char = bytearray([b])
if in_quotes:
token.extend(char)
if char == b'"':
in_quotes = False
tokens.append(token[1:-1])
token = bytearray()
else:
if char == b' ':
pass
elif char == b',' or char == b')':
tokens.append(token)
tokens.append(char)
token = bytearray()
elif char == b'(':
if len(token) > 0:
raise AtParsingError("open_paren following regular character")
tokens.append(char)
elif char == b'"':
if len(token) > 0:
raise AtParsingError("quote following regular character")
in_quotes = True
token.extend(char)
else:
token.extend(char)
tokens.append(token)
return [bytes(token) for token in tokens if len(token) > 0]
def parse_parameters(buffer: bytes) -> list[bytes | list]:
"""Parse the parameters using the comma and parenthesis separators.
Raises AtParsingError in case of invalid input string."""
tokens = tokenize_parameters(buffer)
accumulator: list[list] = [[]]
current: bytes | list = b''
for token in tokens:
if token == b',':
accumulator[-1].append(current)
current = b''
elif token == b'(':
accumulator.append([])
elif token == b')':
if len(accumulator) < 2:
raise AtParsingError("close_paren without matching open_paren")
accumulator[-1].append(current)
current = accumulator.pop()
else:
current = token
accumulator[-1].append(current)
if len(accumulator) > 1:
raise AtParsingError("missing close_paren")
return accumulator[0]
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