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/*
* Copyright 2021 Google Inc. 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.turbine.options;
import com.google.auto.value.AutoValue;
import com.google.common.collect.ImmutableList;
import com.google.common.primitives.Ints;
import java.util.Iterator;
import java.util.OptionalInt;
import javax.lang.model.SourceVersion;
/**
* The language version being compiled, corresponding to javac's {@code -source}, {@code -target},
* and {@code --release} flags.
*/
@AutoValue
public abstract class LanguageVersion {
/** The source version. */
public abstract int source();
/** The target version. */
public abstract int target();
/**
* The release version.
*
* <p>If set, system APIs will be resolved from the host JDK's ct.sym instead of using the
* provided {@code --bootclasspath}.
*/
public abstract OptionalInt release();
/** The class file major version corresponding to the {@link #target}. */
public int majorVersion() {
return target() + 44;
}
public SourceVersion sourceVersion() {
try {
return SourceVersion.valueOf("RELEASE_" + source());
} catch (IllegalArgumentException unused) {
return SourceVersion.latestSupported();
}
}
private static LanguageVersion create(int source, int target, OptionalInt release) {
return new AutoValue_LanguageVersion(source, target, release);
}
/** The default language version. Currently Java 8. */
public static LanguageVersion createDefault() {
return create(DEFAULT, DEFAULT, OptionalInt.empty());
}
private static final int DEFAULT = 8;
/** Returns the effective {@code LanguageVersion} for the given list of javac options. */
public static LanguageVersion fromJavacopts(ImmutableList<String> javacopts) {
int sourceVersion = DEFAULT;
int targetVersion = DEFAULT;
OptionalInt release = OptionalInt.empty();
Iterator<String> it = javacopts.iterator();
while (it.hasNext()) {
String option = it.next();
switch (option) {
case "-source":
case "--source":
if (!it.hasNext()) {
throw new IllegalArgumentException(option + " requires an argument");
}
sourceVersion = parseVersion(it.next());
release = OptionalInt.empty();
break;
case "-target":
case "--target":
if (!it.hasNext()) {
throw new IllegalArgumentException(option + " requires an argument");
}
targetVersion = parseVersion(it.next());
release = OptionalInt.empty();
break;
case "--release":
if (!it.hasNext()) {
throw new IllegalArgumentException(option + " requires an argument");
}
String value = it.next();
Integer n = Ints.tryParse(value);
if (n == null) {
throw new IllegalArgumentException("invalid --release version: " + value);
}
release = OptionalInt.of(n);
sourceVersion = n;
targetVersion = n;
break;
default:
break;
}
}
return create(sourceVersion, targetVersion, release);
}
private static int parseVersion(String value) {
boolean hasPrefix = value.startsWith("1.");
Integer version = Ints.tryParse(hasPrefix ? value.substring("1.".length()) : value);
if (version == null || !isValidVersion(version, hasPrefix)) {
throw new IllegalArgumentException("invalid -source version: " + value);
}
return version;
}
private static boolean isValidVersion(int version, boolean hasPrefix) {
if (version < 5) {
// the earliest source version supported by JDK 8 is Java 5
return false;
}
if (hasPrefix && version > 10) {
// javac supports legacy `1.*` version numbers for source versions up to Java 10
return false;
}
return true;
}
}
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