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# Copyright 2021 The Pigweed 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
#
# https://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.
"""Applies an Environment to the current process."""
import os
# Disable super() warnings since this file must be Python 2 compatible.
# pylint: disable=super-with-arguments
class ApplyVisitor(object): # pylint: disable=useless-object-inheritance
"""Applies an Environment to the current process."""
def __init__(self, *args, **kwargs):
pathsep = kwargs.pop('pathsep', os.pathsep)
super(ApplyVisitor, self).__init__(*args, **kwargs)
self._pathsep = pathsep
self._environ = None
self._unapply_steps = None
def apply(self, env, environ):
self._unapply_steps = []
try:
self._environ = environ
env.accept(self)
finally:
self._environ = None
def visit_set(self, set): # pylint: disable=redefined-builtin
self._environ[set.name] = set.value
def visit_clear(self, clear):
if clear.name in self._environ:
del self._environ[clear.name]
def visit_remove(self, remove):
values = self._environ.get(remove.name, '').split(self._pathsep)
norm = os.path.normpath
values = [x for x in values if norm(x) != norm(remove.value)]
self._environ[remove.name] = self._pathsep.join(values)
def visit_prepend(self, prepend):
self._environ[prepend.name] = self._pathsep.join(
(prepend.value, self._environ.get(prepend.name, '')))
def visit_append(self, append):
self._environ[append.name] = self._pathsep.join(
(self._environ.get(append.name, ''), append.value))
def visit_echo(self, echo):
pass # Not relevant for apply.
def visit_comment(self, comment):
pass # Not relevant for apply.
def visit_command(self, command):
pass # Not relevant for apply.
def visit_doctor(self, doctor):
pass # Not relevant for apply.
def visit_blank_line(self, blank_line):
pass # Not relevant for apply.
def visit_function(self, function):
pass # Not relevant for apply.
def visit_hash(self, hash): # pylint: disable=redefined-builtin
pass # Not relevant for apply.
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