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/*
* Copyright (C) 2020 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.build.config;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* Position in a source file.
*/
public class Position implements Comparable<Position> {
/**
* Sentinel line number for when there is no known line number.
*/
public static final int NO_LINE = -1;
private static final Pattern REGEX = Pattern.compile("([^:]*)(?::(\\d)*)?:?\\s*");
public static final String UNKNOWN = "<unknown>";
private final String mFile;
private final int mLine;
public Position() {
mFile = null;
mLine = NO_LINE;
}
public Position(String file) {
mFile = file;
mLine = NO_LINE;
}
public Position(String file, int line) {
if (line < NO_LINE) {
throw new IllegalArgumentException("Negative line number. file=" + file
+ " line=" + line);
}
mFile = file;
mLine = line;
}
public int compareTo(Position that) {
int result = mFile.compareTo(that.mFile);
if (result != 0) {
return result;
}
return mLine - that.mLine;
}
public String getFile() {
return mFile;
}
public int getLine() {
return mLine;
}
/**
* Return a Position object from a string containing <filename>:<line>, or the default
* Position(null, NO_LINE) if the string can't be parsed.
*/
public static Position parse(String str) {
final Matcher m = REGEX.matcher(str);
if (!m.matches()) {
return new Position();
}
String filename = m.group(1);
if (filename.length() == 0 || UNKNOWN.equals(filename)) {
filename = null;
}
String lineString = m.group(2);
int line;
if (lineString == null || lineString.length() == 0) {
line = NO_LINE;
} else {
try {
line = Integer.parseInt(lineString);
} catch (NumberFormatException ex) {
line = NO_LINE;
}
}
return new Position(filename, line);
}
@Override
public String toString() {
if (mFile == null && mLine == NO_LINE) {
return "";
} else if (mFile == null && mLine != NO_LINE) {
return UNKNOWN + ":" + mLine + ": ";
} else if (mFile != null && mLine == NO_LINE) {
return mFile + ": ";
} else { // if (mFile != null && mLine != NO_LINE)
return mFile + ':' + mLine + ": ";
}
}
}
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