esp-idf/tools/ldgen/sdkconfig.py

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#
# 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.
#
import os
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from pyparsing import Word, printables, Combine, Literal, hexnums, quotedString, Optional, nums, removeQuotes, oneOf, Group, infixNotation, opAssoc
import sys
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try:
import kconfiglib
except ImportError:
parent_dir_name = os.path.dirname(os.path.dirname(os.path.realpath(__file__)))
kconfig_new_dir = os.path.abspath(parent_dir_name + "/kconfig_new")
sys.path.append(kconfig_new_dir)
import kconfiglib
class SDKConfig:
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"""
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(printables.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]))
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LITERAL = Word(printables)
QUOTED_LITERAL = quotedString.setParseAction(removeQuotes)
VALUE = HEX | DECIMAL | LITERAL | QUOTED_LITERAL
# Operators supported by the expression evaluation
OPERATOR = oneOf(["=", "!=", ">", "<", "<=", ">="])
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def __init__(self, kconfig_file, sdkconfig_file, env=[]):
env = [(name, value) for (name,value) in (e.split("=",1) for e in env)]
for name, value in env:
value = " ".join(value.split())
os.environ[name] = value
self.config = kconfiglib.Kconfig(kconfig_file.name)
self.config.load_config(sdkconfig_file.name)
def evaluate_expression(self, expression):
result = self.config.eval_string(expression)
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if result == 0: # n
return False
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elif result == 2: # y
return True
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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())
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grammar = infixNotation(condition, [
("!", 1, opAssoc.RIGHT),
("&&", 2, opAssoc.LEFT),
("||", 2, opAssoc.LEFT)])
return grammar