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/*
* Copyright (C) 2007-2010 Júlio Vilmar Gesser.
* Copyright (C) 2011, 2013-2016 The JavaParser Team.
*
* This file is part of JavaParser.
*
* JavaParser can be used either under the terms of
* a) the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
* b) the terms of the Apache License
*
* You should have received a copy of both licenses in LICENCE.LGPL and
* LICENCE.APACHE. Please refer to those files for details.
*
* JavaParser is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*/
package com.github.javaparser;
import com.github.javaparser.ast.Node;
import static com.github.javaparser.utils.Utils.assertNotNull;
/**
* A position in a source file. Lines and columns start counting at 1.
*/
public class Position implements Comparable<Position> {
public final int line;
public final int column;
/**
* The first position in the file
*/
public static final Position HOME = new Position(1, 1);
public Position(int line, int column) {
if (line < Node.ABSOLUTE_END_LINE) {
throw new IllegalArgumentException("Can't position at line " + line);
}
if (column < -1) {
throw new IllegalArgumentException("Can't position at column " + column);
}
this.line = line;
this.column = column;
}
/**
* Convenient factory method.
*/
public static Position pos(int line, int column) {
return new Position(line, column);
}
public Position withColumn(int column) {
return new Position(this.line, column);
}
public Position withLine(int line) {
return new Position(line, this.column);
}
/**
* Check if the position is usable. Does not know what it is pointing at, so it can't check if the position is after
* the end of the source.
*/
public boolean valid() {
return line > 0 && column > 0;
}
public boolean invalid() {
return !valid();
}
public Position orIfInvalid(Position anotherPosition) {
assertNotNull(anotherPosition);
if (valid() || anotherPosition.invalid()) {
return this;
}
return anotherPosition;
}
public boolean isAfter(Position position) {
assertNotNull(position);
if (position.line == Node.ABSOLUTE_BEGIN_LINE) return true;
if (line > position.line) {
return true;
} else if (line == position.line) {
return column > position.column;
}
return false;
}
public boolean isBefore(Position position) {
assertNotNull(position);
if (position.line == Node.ABSOLUTE_END_LINE) return true;
if (line < position.line) {
return true;
} else if (line == position.line) {
return column < position.column;
}
return false;
}
@Override
public int compareTo(Position o) {
assertNotNull(o);
if (isBefore(o)) {
return -1;
}
if (isAfter(o)) {
return 1;
}
return 0;
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
Position position = (Position) o;
return line == position.line && column == position.column;
}
@Override
public int hashCode() {
return 31 * line + column;
}
@Override
public String toString() {
return "(line " + line + ",col " + column + ")";
}
}
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