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/*
* Copyright (C) 2011 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 com.android.loganalysis.parser;
import com.android.loganalysis.item.TracesItem;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* A {@link IParser} to parse Android traces files.
* <p>
* For now, this only extracts the main stack trace from the first process. It is used to get a
* stack from {@code /data/anr/traces.txt} which can be used to give some context about the ANR. If
* there is a need, this parser can be expanded to parse all stacks from all processes.
*/
public class TracesParser implements IParser {
/**
* Matches: ----- pid PID at YYYY-MM-DD hh:mm:ss -----
*/
private static final Pattern PID = Pattern.compile(
"^----- pid (\\d+) at \\d{4}-\\d{2}-\\d{2} \\d{2}:\\d{2}:\\d{2} -----$");
/**
* Matches: Cmd line: APP
*/
private static final Pattern APP = Pattern.compile("^Cmd ?line: (\\S+).*$");
/**
* Matches: "main" prio=5 tid=1 STATE
*/
private static final Pattern STACK = Pattern.compile("^\"main\" .*$");
/**
* {@inheritDoc}
*
* @return The {@link TracesItem}.
*/
@Override
public TracesItem parse(List<String> lines) {
TracesItem traces = new TracesItem();
StringBuffer stack = null;
for (String line : lines) {
if (stack == null) {
Matcher m = PID.matcher(line);
if (m.matches()) {
traces.setPid(Integer.parseInt(m.group(1)));
}
m = APP.matcher(line);
if (m.matches()) {
traces.setApp(m.group(1));
}
m = STACK.matcher(line);
if (m.matches()) {
stack = new StringBuffer();
stack.append(line);
stack.append("\n");
}
} else if (!"".equals(line)) {
stack.append(line);
stack.append("\n");
} else {
traces.setStack(stack.toString().trim());
return traces;
}
}
if (stack == null) {
return null;
}
traces.setStack(stack.toString().trim());
return traces;
}
}
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