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/*
* Copyright 2016 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 static com.google.common.base.Preconditions.checkArgument;
import static java.nio.charset.StandardCharsets.UTF_8;
import com.google.common.base.CharMatcher;
import com.google.common.base.Splitter;
import com.google.common.collect.ImmutableList;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.ArrayDeque;
import java.util.Deque;
import java.util.Iterator;
import org.checkerframework.checker.nullness.qual.Nullable;
/** A command line options parser for {@link TurbineOptions}. */
public class TurbineOptionsParser {
/**
* Parses command line options into {@link TurbineOptions}, expanding any {@code @params} files.
*/
public static TurbineOptions parse(Iterable<String> args) throws IOException {
TurbineOptions.Builder builder = TurbineOptions.builder();
parse(builder, args);
return builder.build();
}
/**
* Parses command line options into a {@link TurbineOptions.Builder}, expanding any
* {@code @params} files.
*/
public static void parse(TurbineOptions.Builder builder, Iterable<String> args)
throws IOException {
Deque<String> argumentDeque = new ArrayDeque<>();
expandParamsFiles(argumentDeque, args);
parse(builder, argumentDeque);
}
private static void parse(TurbineOptions.Builder builder, Deque<String> argumentDeque) {
while (!argumentDeque.isEmpty()) {
String next = argumentDeque.pollFirst();
switch (next) {
case "--output":
builder.setOutput(readOne(argumentDeque));
break;
case "--source_jars":
builder.setSourceJars(readList(argumentDeque));
break;
case "--temp_dir":
// TODO(cushon): remove this when Bazel no longer passes the flag
readOne(argumentDeque);
break;
case "--processors":
builder.addProcessors(readList(argumentDeque));
break;
case "--processorpath":
builder.addProcessorPathEntries(readList(argumentDeque));
break;
case "--classpath":
builder.addClassPathEntries(readList(argumentDeque));
break;
case "--bootclasspath":
builder.addBootClassPathEntries(readList(argumentDeque));
break;
case "--release":
builder.setRelease(readOne(argumentDeque));
break;
case "--system":
builder.setSystem(readOne(argumentDeque));
break;
case "--javacopts":
{
ImmutableList<String> javacopts = readJavacopts(argumentDeque);
setReleaseFromJavacopts(builder, javacopts);
builder.addAllJavacOpts(javacopts);
break;
}
case "--sources":
builder.addSources(readList(argumentDeque));
break;
case "--output_deps":
builder.setOutputDeps(readOne(argumentDeque));
break;
case "--direct_dependencies":
builder.addDirectJars(readList(argumentDeque));
break;
case "--deps_artifacts":
builder.addAllDepsArtifacts(readList(argumentDeque));
break;
case "--target_label":
builder.setTargetLabel(readOne(argumentDeque));
break;
case "--injecting_rule_kind":
builder.setInjectingRuleKind(readOne(argumentDeque));
break;
case "--javac_fallback":
builder.setJavacFallback(true);
break;
case "--nojavac_fallback":
builder.setJavacFallback(false);
break;
case "--reduce_classpath":
builder.setShouldReduceClassPath(true);
break;
case "--noreduce_classpath":
builder.setShouldReduceClassPath(false);
break;
case "--help":
builder.setHelp(true);
break;
default:
throw new IllegalArgumentException("unknown option: " + next);
}
}
}
private static final Splitter ARG_SPLITTER =
Splitter.on(CharMatcher.breakingWhitespace()).omitEmptyStrings().trimResults();
/**
* Pre-processes an argument list, expanding arguments of the form {@code @filename} by reading
* the content of the file and appending whitespace-delimited options to {@code argumentDeque}.
*/
private static void expandParamsFiles(Deque<String> argumentDeque, Iterable<String> args)
throws IOException {
for (String arg : args) {
if (arg.isEmpty()) {
continue;
}
if (arg.charAt(0) == '\'') {
// perform best-effort unescaping as a concession to ninja, see:
// https://android.googlesource.com/platform/external/ninja/+/6f903faaf5488dc052ffc4e3e0b12757b426e088/src/util.cc#274
checkArgument(arg.charAt(arg.length() - 1) == '\'', arg);
arg = arg.substring(1, arg.length() - 1);
checkArgument(!arg.contains("'"), arg);
}
if (arg.startsWith("@@")) {
argumentDeque.addLast(arg.substring(1));
} else if (arg.startsWith("@")) {
Path paramsPath = Paths.get(arg.substring(1));
if (!Files.exists(paramsPath)) {
throw new AssertionError("params file does not exist: " + paramsPath);
}
expandParamsFiles(
argumentDeque, ARG_SPLITTER.split(new String(Files.readAllBytes(paramsPath), UTF_8)));
} else {
argumentDeque.addLast(arg);
}
}
}
/** Returns the value of an option, or {@code null}. */
@Nullable
private static String readOne(Deque<String> argumentDeque) {
if (argumentDeque.isEmpty() || argumentDeque.peekFirst().startsWith("-")) {
return null;
}
return argumentDeque.pollFirst();
}
/** Returns a list of option values. */
private static ImmutableList<String> readList(Deque<String> argumentDeque) {
ImmutableList.Builder<String> result = ImmutableList.builder();
while (!argumentDeque.isEmpty() && !argumentDeque.peekFirst().startsWith("--")) {
result.add(argumentDeque.pollFirst());
}
return result.build();
}
/**
* Returns a list of javacopts. Reads options until a terminating {@code "--"} is reached, to
* support parsing javacopts that start with {@code --} (e.g. --release).
*/
private static ImmutableList<String> readJavacopts(Deque<String> argumentDeque) {
ImmutableList.Builder<String> result = ImmutableList.builder();
while (!argumentDeque.isEmpty()) {
String arg = argumentDeque.pollFirst();
if (arg.equals("--")) {
return result.build();
}
result.add(arg);
}
throw new IllegalArgumentException("javacopts should be terminated by `--`");
}
/**
* Parses the given javacopts for {@code --release}, and if found sets turbine's {@code --release}
* flag.
*/
private static void setReleaseFromJavacopts(
TurbineOptions.Builder builder, ImmutableList<String> javacopts) {
Iterator<String> it = javacopts.iterator();
while (it.hasNext()) {
if (it.next().equals("--release") && it.hasNext()) {
builder.setRelease(it.next());
}
}
}
}
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