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185 changes: 185 additions & 0 deletions
185
scripts/py_matter_yamltests/matter_yamltests/pics_checker.py
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,185 @@ | ||
| # | ||
| # Copyright (c) 2023 Project CHIP Authors | ||
| # | ||
| # 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 | ||
| # | ||
| # http://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. | ||
|
|
||
| import unicodedata | ||
|
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||
| _COMMENT_CHARACTER = '#' | ||
| _VALUE_SEPARATOR = '=' | ||
| _VALUE_DISABLED = '0' | ||
| _VALUE_ENABLED = '1' | ||
| _CONTROL_CHARACTER_IDENTIFIER = 'C' | ||
|
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| class InvalidPICSConfigurationError(Exception): | ||
| "Raised when the configured pics entry can not be parsed." | ||
| pass | ||
|
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|
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| class InvalidPICSConfigurationValueError(Exception): | ||
| "Raised when the configured pics value is not an authorized value." | ||
| pass | ||
|
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|
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| class InvalidPICSParsingError(Exception): | ||
| "Raised when a parsing error occured." | ||
| pass | ||
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|
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| class PICSChecker(): | ||
| """Class to compute a PICS expression""" | ||
| __pics: None | ||
| __expression_index: 0 | ||
|
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| def __init__(self, pics_file: str): | ||
| if pics_file is not None: | ||
| self.__pics = self.__parse(pics_file) | ||
|
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| def check(self, pics) -> bool: | ||
| if pics is None: | ||
| return True | ||
|
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| self.__expression_index = 0 | ||
| tokens = self.__tokenize(pics) | ||
| return self.__evaluate_expression(tokens, self.__pics) | ||
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| def __parse(self, pics_file: str): | ||
| pics = {} | ||
| with open(pics_file) as f: | ||
| line = f.readline() | ||
| while line: | ||
| preprocessed_line = self.__preprocess_input(line) | ||
| if preprocessed_line: | ||
| items = preprocessed_line.split(_VALUE_SEPARATOR) | ||
| # There should always be one key and one value, nothing else. | ||
| if len(items) != 2: | ||
| raise InvalidPICSConfigurationError( | ||
| f'Invalid expression: {line}') | ||
|
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| key, value = items | ||
| if value != _VALUE_DISABLED and value != _VALUE_ENABLED: | ||
| raise InvalidPICSConfigurationValueError( | ||
| f'Invalid expression: {line}') | ||
|
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| pics[key] = value == _VALUE_ENABLED | ||
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| line = f.readline() | ||
| return pics | ||
|
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| def __evaluate_expression(self, tokens: list[str], pics: dict): | ||
| leftExpr = self.__evaluate_sub_expression(tokens, pics) | ||
| if self.__expression_index >= len(tokens): | ||
| return leftExpr | ||
|
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| token = tokens[self.__expression_index] | ||
|
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| if token == ')': | ||
| return leftExpr | ||
|
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| token = tokens[self.__expression_index] | ||
|
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| if token == '&&': | ||
| self.__expression_index += 1 | ||
| rightExpr = self.__evaluate_sub_expression(tokens, pics) | ||
| return leftExpr and rightExpr | ||
|
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| if token == '||': | ||
| self.__expression_index += 1 | ||
| rightExpr = self.__evaluate_sub_expression(tokens, pics) | ||
| return leftExpr or rightExpr | ||
|
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| raise InvalidPICSParsingError(f'Unknown token: {token}') | ||
|
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| def __evaluate_sub_expression(self, tokens: list[str], pics: dict): | ||
| token = tokens[self.__expression_index] | ||
| if token == '(': | ||
| self.__expression_index += 1 | ||
| expr = self.__evaluate_expression(tokens, pics) | ||
| if tokens[self.__expression_index] != ')': | ||
| raise KeyError('Missing ")"') | ||
|
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| self.__expression_index += 1 | ||
| return expr | ||
|
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| if token == '!': | ||
| self.__expression_index += 1 | ||
| expr = self.__evaluate_expression(tokens, pics) | ||
| return not expr | ||
|
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| token = self.__normalize(token) | ||
| self.__expression_index += 1 | ||
|
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| if pics.get(token) == None: | ||
| # By default, let's consider that if a PICS item is not defined, it is |false|. | ||
| # It allows to create a file that only contains enabled features. | ||
| return False | ||
|
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| return pics.get(token) | ||
|
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| def __tokenize(self, expression: str): | ||
| token = '' | ||
| tokens = [] | ||
|
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| for c in expression: | ||
| if c == ' ' or c == '\t' or c == '\n': | ||
| pass | ||
| elif c == '(' or c == ')' or c == '!': | ||
| if token: | ||
| tokens.append(token) | ||
| token = '' | ||
| tokens.append(c) | ||
| elif c == '&' or c == '|': | ||
| if token and token[-1] == c: | ||
| token = token[:-1] | ||
| if token: | ||
| tokens.append(token) | ||
| token = '' | ||
| tokens.append(c + c) | ||
| else: | ||
| token += c | ||
| else: | ||
| token += c | ||
|
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| if token: | ||
| tokens.append(token) | ||
| token = '' | ||
|
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| return tokens | ||
|
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| def __preprocess_input(self, value: str): | ||
| value = self.__remove_comments(value) | ||
| value = self.__remove_control_characters(value) | ||
| value = self.__remove_whitespaces(value) | ||
| value = self.__make_lowercase(value) | ||
| return value | ||
|
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| def __remove_comments(self, value: str) -> str: | ||
| return value if not value else value.split(_COMMENT_CHARACTER, 1)[0] | ||
|
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| def __remove_control_characters(self, value: str) -> str: | ||
| return ''.join(c for c in value if unicodedata.category(c)[0] != _CONTROL_CHARACTER_IDENTIFIER) | ||
|
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| def __remove_whitespaces(self, value: str) -> str: | ||
| return value.replace(' ', '') | ||
|
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| def __make_lowercase(self, value: str) -> str: | ||
| return value.lower() | ||
|
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| def __normalize(self, token: str): | ||
| # Convert to all-lowercase so people who mess up cases don't have things | ||
| # break on them in subtle ways. | ||
| token = self.__make_lowercase(token) | ||
|
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| # TODO strip off "(Additional Context)" bits from the end of the code. | ||
| return token |
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