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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.cpp;
import com.google.common.annotations.VisibleForTesting;
import com.google.devtools.build.lib.util.io.FileOutErr;
import com.google.devtools.build.lib.vfs.Path;
import java.io.ByteArrayOutputStream;
import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
/**
* A Class for filtering the output of /showIncludes from MSVC compiler.
*
* <p>A discovered header file will be printed with prefix "Note: including file:", the path is
* collected, and the line is suppressed from the actual output users can see.
*
* <p>Also suppress the basename of source file, which is printed unconditionally by MSVC compiler,
* there is no way to turn it off.
*/
public class ShowIncludesFilter implements FileOutErr.OutputFilter {
private FilterShowIncludesOutputStream filterShowIncludesOutputStream;
private final String sourceFileName;
public ShowIncludesFilter(String sourceFileName) {
this.sourceFileName = sourceFileName;
}
/**
* Use this class to filter and collect the headers discovered by MSVC compiler, also filter out
* the source file name printed unconditionally by the compiler.
*/
public static class FilterShowIncludesOutputStream extends FilterOutputStream {
private final ByteArrayOutputStream buffer = new ByteArrayOutputStream(4096);
private final Collection<String> dependencies = new ArrayList<>();
private static final int NEWLINE = '\n';
private static final String SHOW_INCLUDES_PREFIX = "Note: including file:";
private final String sourceFileName;
public FilterShowIncludesOutputStream(OutputStream out, String sourceFileName) {
super(out);
this.sourceFileName = sourceFileName;
}
@Override
public void write(int b) throws IOException {
buffer.write(b);
if (b == NEWLINE) {
String line = buffer.toString(StandardCharsets.UTF_8.name());
if (line.startsWith(SHOW_INCLUDES_PREFIX)) {
dependencies.add(line.substring(SHOW_INCLUDES_PREFIX.length()).trim());
} else if (!line.trim().equals(sourceFileName)) {
buffer.writeTo(out);
}
buffer.reset();
}
}
@Override
public void flush() throws IOException {
String line = buffer.toString(StandardCharsets.UTF_8.name());
if (!line.startsWith(SHOW_INCLUDES_PREFIX)
&& !line.startsWith(sourceFileName)
&& !SHOW_INCLUDES_PREFIX.startsWith(line)
&& !sourceFileName.startsWith(line)) {
buffer.writeTo(out);
buffer.reset();
}
out.flush();
}
public Collection<String> getDependencies() {
return this.dependencies;
}
}
@Override
public FilterOutputStream getFilteredOutputStream(OutputStream outputStream) {
filterShowIncludesOutputStream =
new FilterShowIncludesOutputStream(outputStream, sourceFileName);
return filterShowIncludesOutputStream;
}
public Collection<Path> getDependencies(Path root) {
Collection<Path> dependenciesInPath = new ArrayList<>();
if (filterShowIncludesOutputStream != null) {
for (String dep : filterShowIncludesOutputStream.getDependencies()) {
dependenciesInPath.add(root.getRelative(dep));
}
}
return Collections.unmodifiableCollection(dependenciesInPath);
}
@VisibleForTesting
Collection<String> getDependencies() {
return filterShowIncludesOutputStream.getDependencies();
}
}
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