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/*
* Copyright (C) 2018 The Android Open Source Project
*
* 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 android.signature.cts;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.nio.ByteBuffer;
import java.util.Arrays;
import java.util.function.BiFunction;
import java.util.function.Function;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.stream.Stream;
import java.util.stream.StreamSupport;
import java.text.ParseException;
/**
* Parses an API definition given as a text file with DEX signatures of class
* members. Constructs a {@link DexApiDocumentParser.DexMember} for every class
* member.
*
* <p>The definition file is converted into a {@link Stream} of
* {@link DexApiDocumentParser.DexMember}.
*/
public class DexApiDocumentParser {
// Regex patterns which match DEX signatures of methods and fields.
// See comment by next() for more details.
private static final Pattern REGEX_FIELD = Pattern.compile("^(L[^>]*;)->(.*):(.*)$");
private static final Pattern REGEX_METHOD =
Pattern.compile("^(L[^>]*;)->(.*)(\\(.*\\).*)$");
// Estimate of the length of a line.
private static final int LINE_LENGTH_ESTIMATE = 100;
// Converter from String to DexMember. Cached here.
private static final Function<String, DexMember> DEX_MEMBER_CONVERTER = str -> {
try {
return parseLine(str, /* lineNum= */ -1); // No line info available.
} catch (ParseException e) {
throw new RuntimeException(e);
}
};
private static final BiFunction<String, Integer, DexMember> DEX_MEMBER_LINE_NUM_CONVERTER = (
str, lineNum) -> {
try {
return parseLine(str, lineNum);
} catch (ParseException e) {
throw new RuntimeException(e);
}
};
public Stream<DexMember> parseAsStream(Object o) {
if (o instanceof ByteBuffer) {
return parseAsStream((ByteBuffer) o);
} else {
return parseAsStream((InputStream) o);
}
}
public Stream<DexMember> parseAsStream(InputStream inputStream) {
BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
return StreamSupport.stream(
new BufferedReaderLineSpliterator<DexMember>(reader, DEX_MEMBER_LINE_NUM_CONVERTER),
false);
}
public Stream<DexMember> parseAsStream(ByteBuffer buffer) {
return parseAsStream(buffer, LINE_LENGTH_ESTIMATE);
}
public Stream<DexMember> parseAsStream(ByteBuffer buffer, int lineLengthEstimate) {
// TODO: Ensurance that the input conforms to ByteBufferLineSpliterator requirements.
return StreamSupport.stream(new ByteBufferLineSpliterator<DexMember>(buffer,
lineLengthEstimate, DEX_MEMBER_CONVERTER), true);
}
public static DexMember parseLine(String line, int lineNum) throws ParseException {
// Split the CSV line.
String[] splitLine = line.split(",");
String signature = splitLine[0];
String[] flags = Arrays.copyOfRange(splitLine, 1, splitLine.length);
// Match line against regex patterns.
Matcher matchField = REGEX_FIELD.matcher(signature);
Matcher matchMethod = REGEX_METHOD.matcher(signature);
// Check that *exactly* one pattern matches.
int matchCount = (matchField.matches() ? 1 : 0) + (matchMethod.matches() ? 1 : 0);
if (matchCount == 0) {
throw new ParseException("Could not parse: \"" + line + "\"", lineNum);
} else if (matchCount > 1) {
throw new ParseException("Ambiguous parse: \"" + line + "\"", lineNum);
}
// Extract information from the signature.
if (matchField.matches()) {
return new DexField(
matchField.group(1), matchField.group(2), matchField.group(3), flags);
} else if (matchMethod.matches()) {
return new DexMethod(
matchMethod.group(1),matchMethod.group(2), matchMethod.group(3), flags);
}
throw new IllegalStateException();
}
}
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