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74 lines
2.7 KiB
Python
74 lines
2.7 KiB
Python
#
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# Copyright 2021 Espressif Systems (Shanghai) CO LTD
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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import kconfiglib
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from pyparsing import (Combine, Group, Literal, Optional, Word, alphanums, hexnums, infixNotation, nums, oneOf,
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opAssoc, printables, quotedString, removeQuotes)
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class SDKConfig:
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"""
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Encapsulates an sdkconfig file. Defines grammar of a configuration entry, and enables
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evaluation of logical expressions involving those entries.
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"""
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# A configuration entry is in the form CONFIG=VALUE. Definitions of components of that grammar
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IDENTIFIER = Word(alphanums.upper() + '_')
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HEX = Combine('0x' + Word(hexnums)).setParseAction(lambda t:int(t[0], 16))
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DECIMAL = Combine(Optional(Literal('+') | Literal('-')) + Word(nums)).setParseAction(lambda t:int(t[0]))
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LITERAL = Word(printables.replace(':', ''))
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QUOTED_LITERAL = quotedString.setParseAction(removeQuotes)
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VALUE = HEX | DECIMAL | LITERAL | QUOTED_LITERAL
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# Operators supported by the expression evaluation
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OPERATOR = oneOf(['=', '!=', '>', '<', '<=', '>='])
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def __init__(self, kconfig_file, sdkconfig_file):
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self.config = kconfiglib.Kconfig(kconfig_file)
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self.config.load_config(sdkconfig_file)
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def evaluate_expression(self, expression):
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result = self.config.eval_string(expression)
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if result == 0: # n
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return False
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elif result == 2: # y
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return True
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else: # m
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raise Exception('unsupported config expression result')
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@staticmethod
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def get_expression_grammar():
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identifier = SDKConfig.IDENTIFIER.setResultsName('identifier')
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operator = SDKConfig.OPERATOR.setResultsName('operator')
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value = SDKConfig.VALUE.setResultsName('value')
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test_binary = identifier + operator + value
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test_single = identifier
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test = test_binary | test_single
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condition = Group(Optional('(').suppress() + test + Optional(')').suppress())
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grammar = infixNotation(condition, [
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('!', 1, opAssoc.RIGHT),
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('&&', 2, opAssoc.LEFT),
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('||', 2, opAssoc.LEFT)])
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return grammar
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