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// Copyright (c) 2017, the R8 project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
package com.android.tools.r8;
import com.android.tools.r8.origin.Origin;
import com.android.tools.r8.origin.PathOrigin;
import com.android.tools.r8.utils.ExceptionDiagnostic;
import java.io.IOException;
import java.io.Writer;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Path;
/** Interface for receiving String resource. */
@KeepForSubclassing
public interface StringConsumer {
/**
* Callback to receive part of a string resource.
*
* <p>The consumer is expected not to throw, but instead report any errors via the diagnostics
* {@param handler}. If an error is reported via {@param handler} and no exceptions are thrown,
* then the compiler guaranties to exit with an error.
*
* <p>Note: prior to the addition of 'finished' consumers could expect all content to be reported
* in one call to accept. That is no longer guaranteed.
*
* @param string Part of the string resource.
* @param handler Diagnostics handler for reporting.
*/
void accept(String string, DiagnosticsHandler handler);
/**
* Callback when no further content will be provided for the string resource.
*
* <p>The consumer is expected not to throw, but instead report any errors via the diagnostics
* {@param handler}. If an error is reported via {@param handler} and no exceptions are thrown,
* then the compiler guaranties to exit with an error.
*
* @param handler Diagnostics handler for reporting.
*/
default void finished(DiagnosticsHandler handler) {}
static EmptyConsumer emptyConsumer() {
return EmptyConsumer.EMPTY_CONSUMER;
}
/** Empty consumer to request the production of the resource but ignore its value. */
class EmptyConsumer implements StringConsumer {
private static final EmptyConsumer EMPTY_CONSUMER = new EmptyConsumer();
@Override
public void accept(String string, DiagnosticsHandler handler) {
// Ignore content.
}
@Override
public void finished(DiagnosticsHandler handler) {
// No content so, nothing to do.
}
}
/** Forwarding consumer to delegate to an optional existing consumer. */
@Keep
public class ForwardingConsumer implements StringConsumer {
private final StringConsumer consumer;
/** @param consumer Consumer to forward to, if null, nothing will be forwarded. */
public ForwardingConsumer(StringConsumer consumer) {
this.consumer = consumer;
}
@Override
public void accept(String string, DiagnosticsHandler handler) {
if (consumer != null) {
consumer.accept(string, handler);
}
}
@Override
public void finished(DiagnosticsHandler handler) {
if (consumer != null) {
consumer.finished(handler);
}
}
}
/** File consumer to write contents to a file-system file. */
@Keep // TODO(b/121121779) Consider deprecating the R8 provided file writing.
class FileConsumer extends ForwardingConsumer {
private final Path outputPath;
private Charset encoding = StandardCharsets.UTF_8;
private WriterConsumer delegate = null;
private boolean failedToCreateDelegate = false;
/** Consumer that writes to {@param outputPath}. */
public FileConsumer(Path outputPath) {
this(outputPath, null);
}
/** Consumer that forwards to {@param consumer} and also writes to {@param outputPath}. */
public FileConsumer(Path outputPath, StringConsumer consumer) {
super(consumer);
this.outputPath = outputPath;
}
/** Get the output path that the consumer will write to. */
public Path getOutputPath() {
return outputPath;
}
/** Set the output encoding. Defaults to UTF8. */
public void setEncoding(Charset encoding) {
assert encoding != null;
if (delegate != null) {
throw new IllegalStateException("Invalid call to set encoding after file stream is opened");
}
this.encoding = encoding;
}
/** Get the output encoding. Defaults to UTF8. */
public Charset getEncoding() {
return encoding;
}
@Override
public void accept(String string, DiagnosticsHandler handler) {
super.accept(string, handler);
if (failedToCreateDelegate) {
return;
}
ensureDelegate(handler);
if (delegate != null) {
delegate.accept(string, handler);
}
}
@Override
public void finished(DiagnosticsHandler handler) {
super.finished(handler);
if (failedToCreateDelegate) {
return;
}
ensureDelegate(handler);
if (delegate != null) {
delegate.finished(handler);
delegate = null;
}
}
private void ensureDelegate(DiagnosticsHandler handler) {
if (delegate != null) {
return;
}
PathOrigin origin = new PathOrigin(outputPath);
try {
Path parent = outputPath.getParent();
if (parent != null && !parent.toFile().exists()) {
Files.createDirectories(parent);
}
delegate = new WriterConsumer(origin, Files.newBufferedWriter(outputPath, encoding));
} catch (IOException e) {
failedToCreateDelegate = true;
handler.error(new ExceptionDiagnostic(e, origin));
}
}
}
/**
* String consumer to write contents to a Writer.
*
* <p>Note: The writer is closed when the consumer receives its 'finished' callback.
*/
class WriterConsumer extends ForwardingConsumer {
private final Origin origin;
private Writer writer;
/** Consumer that writes to {@param writer}. */
public WriterConsumer(Origin origin, Writer writer) {
this(origin, writer, null);
}
/** Consumer that forwards to {@param consumer} and also writes to {@param writer}. */
public WriterConsumer(Origin origin, Writer writer, StringConsumer consumer) {
super(consumer);
this.origin = origin;
this.writer = writer;
}
@Override
public void accept(String string, DiagnosticsHandler handler) {
super.accept(string, handler);
try {
writer.write(string);
} catch (IOException e) {
handler.error(new ExceptionDiagnostic(e, origin));
}
}
@Override
public void finished(DiagnosticsHandler handler) {
super.finished(handler);
try {
writer.close();
} catch (IOException e) {
handler.error(new ExceptionDiagnostic(e, origin));
}
}
}
}