esp-idf/tools/ldgen/sdkconfig.py

74 lines
2.7 KiB
Python

#
# Copyright 2021 Espressif Systems (Shanghai) CO LTD
#
# 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 kconfiglib
from pyparsing import (Combine, Group, Literal, Optional, Word, alphanums, hexnums, infixNotation, nums, oneOf,
opAssoc, printables, quotedString, removeQuotes)
class SDKConfig:
"""
Evaluates conditional expressions based on the build's sdkconfig and Kconfig files.
This also defines the grammar of conditional expressions.
"""
# A configuration entry is in the form CONFIG=VALUE. Definitions of components of that grammar
IDENTIFIER = Word(alphanums.upper() + '_')
HEX = Combine('0x' + Word(hexnums)).setParseAction(lambda t:int(t[0], 16))
DECIMAL = Combine(Optional(Literal('+') | Literal('-')) + Word(nums)).setParseAction(lambda t:int(t[0]))
LITERAL = Word(printables.replace(':', ''))
QUOTED_LITERAL = quotedString.setParseAction(removeQuotes)
VALUE = HEX | DECIMAL | LITERAL | QUOTED_LITERAL
# Operators supported by the expression evaluation
OPERATOR = oneOf(['=', '!=', '>', '<', '<=', '>='])
def __init__(self, kconfig_file, sdkconfig_file):
self.config = kconfiglib.Kconfig(kconfig_file)
self.config.load_config(sdkconfig_file)
def evaluate_expression(self, expression):
result = self.config.eval_string(expression)
if result == 0: # n
return False
elif result == 2: # y
return True
else: # m
raise Exception('unsupported config expression result')
@staticmethod
def get_expression_grammar():
identifier = SDKConfig.IDENTIFIER.setResultsName('identifier')
operator = SDKConfig.OPERATOR.setResultsName('operator')
value = SDKConfig.VALUE.setResultsName('value')
test_binary = identifier + operator + value
test_single = identifier
test = test_binary | test_single
condition = Group(Optional('(').suppress() + test + Optional(')').suppress())
grammar = infixNotation(condition, [
('!', 1, opAssoc.RIGHT),
('&&', 2, opAssoc.LEFT),
('||', 2, opAssoc.LEFT)])
return grammar