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// Copyright 2014 The Bazel Authors. All rights reserved.
//
// 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.
package com.google.devtools.build.lib.rules.python;
import static com.google.common.collect.Iterables.transform;
import com.google.common.base.Functions;
import com.google.common.collect.ImmutableList;
import java.util.Arrays;
/**
* Python version for Python rules.
*/
public enum PythonVersion {
PY2,
PY3,
PY2AND3,
PY2ONLY,
PY3ONLY;
static final PythonVersion[] ALL_VALUES =
new PythonVersion[] { PY2, PY3, PY2AND3, PY2ONLY, PY3ONLY };
/**
* The Python version to use if not overridden by {@link PythonOptions#forcePython} or a rule's
* {@code default_python_version} or {@code srcs_version} attributes.
*/
static final PythonVersion DEFAULT = PY2;
static final PythonVersion[] NON_CONVERSION_VALUES =
new PythonVersion[] { PY2AND3, PY2ONLY, PY3ONLY };
static final PythonVersion[] TARGET_PYTHON_VALUES =
new PythonVersion[] { PY2, PY3 };
public static PythonVersion defaultSrcsVersion() {
return PY2AND3;
}
public static PythonVersion defaultTargetPythonVersion() {
return DEFAULT;
}
private static Iterable<String> convertToStrings(PythonVersion[] values) {
return transform(ImmutableList.copyOf(values), Functions.toStringFunction());
}
public static PythonVersion[] getAllVersions() {
return ALL_VALUES;
}
public static Iterable<String> getAllValues() {
return convertToStrings(ALL_VALUES);
}
public static Iterable<String> getNonConversionValues() {
return convertToStrings(NON_CONVERSION_VALUES);
}
public static Iterable<String> getTargetPythonValues() {
return convertToStrings(TARGET_PYTHON_VALUES);
}
/**
* Converts the string to PythonVersion, if it is one of the allowed values.
* Returns null if the input is not valid.
*/
public static PythonVersion parse(String str, PythonVersion... allowed) {
if (str == null) {
return null;
}
try {
PythonVersion version = PythonVersion.valueOf(str);
if (Arrays.asList(allowed).contains(version)) {
return version;
}
return null;
} catch (IllegalArgumentException e) {
return null;
}
}
}
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