esp-idf/tools/ldgen/sdkconfig.py

73 wiersze
2.7 KiB
Python

#
# Copyright 2018-2019 Espressif Systems (Shanghai) PTE 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.
#
from pyparsing import Word, alphanums, printables, Combine, Literal, hexnums, quotedString, Optional, nums, removeQuotes, oneOf, Group, infixNotation, opAssoc
import kconfiglib
class SDKConfig:
"""
Encapsulates an sdkconfig file. Defines grammar of a configuration entry, and enables
evaluation of logical expressions involving those entries.
"""
# 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