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179 lines (166 loc) · 4.9 KB
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/*
* Copyright (c) 2007-2017 Mozilla Foundation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
package nu.validator.source;
/**
* Immutable source location with zero-based indexes.
* Cannot point to a line break.
*
* @version $Id$
* @author hsivonen
*/
public final class Location implements Comparable<Location>, Cloneable {
private final SourceCode owner;
private final int line;
private final int column;
/**
* @param line
* @param column
*/
Location(final SourceCode owner, int line, int column) {
this.owner = owner;
if (line < 0) {
line = 0;
column = 0;
} else if (column < 0) {
line--;
if (line < 0) {
line = 0;
column = 0;
} else {
Line sourceLine = owner.getLine(line);
if (sourceLine != null) {
column = sourceLine.getBufferLength();
} else {
column = 0;
}
}
}
this.line = line;
this.column = column;
}
@Override
public int compareTo(Location o) {
if (this.line < o.line) {
return -1;
} else if (this.line > o.line) {
return 1;
} else {
if (this.column < o.column) {
return -1;
} else if (this.column > o.column) {
return 1;
} else {
return 0;
}
}
}
/**
* @see java.lang.Object#equals(java.lang.Object)
*/
@Override
public boolean equals(Object obj) {
if (obj instanceof Location) {
Location loc = (Location) obj;
return this.line == loc.line && this.column == loc.column;
} else {
return false;
}
}
/**
* Returns the column.
*
* @return the column
*/
public int getColumn() {
return column;
}
/**
* Returns the line.
*
* @return the line
*/
public int getLine() {
return line;
}
/**
*
* @see java.lang.Object#hashCode()
*/
@Override
public int hashCode() {
return (line << 16) + column;
}
Location next() {
return step(1);
}
Location prev() {
return step(-1);
}
Location step(int offset) {
int newLine = line;
int newColumn = column;
if (offset > 0) {
for (int i = 0; i < offset; i++) {
if (newLine == owner.getNumberOfLines()) {
break;
}
newColumn++;
Line sourceLine = owner.getLine(newLine);
if (sourceLine == null) {
break;
}
if (newColumn > sourceLine.getBufferLength()) {
newLine++;
newColumn = 0;
}
}
return new Location(owner, newLine, newColumn);
} if (offset < 0) {
offset = -offset;
for (int i = 0; i < offset; i++) {
if (newLine == 0 && newColumn == 0) {
break;
}
newColumn--;
if (newColumn == -1) {
newLine--;
Line sourceLine = owner.getLine(newLine);
if (sourceLine != null) {
newColumn = sourceLine.getBufferLength();
} else {
newColumn = 0;
}
}
}
return new Location(owner, newLine, newColumn);
} else {
return this;
}
}
/**
* @see java.lang.Object#toString()
*/
@Override
public String toString() {
return line + ", " + column;
}
}