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// Copyright 2017 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.common.options;
import static java.nio.charset.StandardCharsets.UTF_8;
import java.io.IOException;
import java.io.PushbackReader;
import java.io.Reader;
import java.nio.file.FileSystem;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.ArrayList;
import java.util.List;
/**
* A {@link ParamsFilePreProcessor} that processes a parameter file using the {@code
* com.google.devtools.build.lib.actions.ParameterFile.ParameterFileType.SHELL_QUOTED} format. This
* format assumes each parameter is separated by whitespace and is quoted using singe quotes
* ({@code '}) if it contains any special characters or is an empty string.
*/
public class ShellQuotedParamsFilePreProcessor extends ParamsFilePreProcessor {
public ShellQuotedParamsFilePreProcessor(FileSystem fs) {
super(fs);
}
@Override
protected List<String> parse(Path paramsFile) throws IOException {
List<String> args = new ArrayList<>();
try (ShellQuotedReader reader =
new ShellQuotedReader(Files.newBufferedReader(paramsFile, UTF_8))) {
String arg;
while ((arg = reader.readArg()) != null) {
args.add(arg);
}
}
return args;
}
private static class ShellQuotedReader implements AutoCloseable {
private final PushbackReader reader;
private int position = -1;
public ShellQuotedReader(Reader reader) {
this.reader = new PushbackReader(reader, 10);
}
private char read() throws IOException {
int value = reader.read();
position++;
return (char) value;
}
private void unread(char value) throws IOException {
reader.unread(value);
position--;
}
private boolean hasNext() throws IOException {
char value = read();
boolean hasNext = value != (char) -1;
unread(value);
return hasNext;
}
@Override
public void close() throws IOException {
reader.close();
}
public String readArg() throws IOException {
if (!hasNext()) {
return null;
}
StringBuilder arg = new StringBuilder();
int quoteStart = -1;
boolean quoted = false;
char current;
while ((current = read()) != (char) -1) {
if (quoted) {
if (current == '\'') {
StringBuilder escapedQuoteRemainder =
new StringBuilder().append(read()).append(read()).append(read());
if (escapedQuoteRemainder.toString().equals("\\''")) {
arg.append("'");
} else {
for (char c : escapedQuoteRemainder.reverse().toString().toCharArray()) {
unread(c);
}
quoted = false;
quoteStart = -1;
}
} else {
arg.append(current);
}
} else {
if (current == '\'') {
quoted = true;
quoteStart = position;
} else if (current == '\r') {
char next = read();
if (next == '\n') {
return arg.toString();
} else {
unread(next);
return arg.toString();
}
} else if (Character.isWhitespace(current)) {
return arg.toString();
} else {
arg.append(current);
}
}
}
if (quoted) {
throw new IOException(
String.format(UNFINISHED_QUOTE_MESSAGE_FORMAT, "'", quoteStart));
}
return arg.toString();
}
}
}
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