001/*
002 * Copyright (c) 2012-2018 Institut National des Sciences Appliquées de Lyon (INSA Lyon) and others
003 *
004 * This program and the accompanying materials are made available under the
005 * terms of the Eclipse Public License 2.0 which is available at
006 * http://www.eclipse.org/legal/epl-2.0.
007 *
008 * SPDX-License-Identifier: EPL-2.0
009 */
010
011package org.eclipse.golo.compiler;
012
013public class PositionInSourceCode {
014
015  private final int startLine;
016  private final int startColumn;
017  private final int endLine;
018  private final int endColumn;
019
020  private static final PositionInSourceCode UNDEFINED = new PositionInSourceCode(0, 0, 0, 0) {
021    @Override
022    public boolean isUndefined() {
023      return true;
024    }
025
026    @Override
027    public String toString() {
028      return "undefined";
029    }
030  };
031
032  private PositionInSourceCode(int startLine, int startColumn, int endLine, int endColumn) {
033    this.startLine = startLine;
034    this.endLine = endLine;
035    this.startColumn = startColumn;
036    this.endColumn = endColumn;
037  }
038
039  public static PositionInSourceCode undefined() {
040    return UNDEFINED;
041  }
042
043  public static PositionInSourceCode of(PositionInSourceCode pos) {
044    if (pos == null) {
045      return UNDEFINED;
046    }
047    return pos;
048  }
049
050  public static PositionInSourceCode of(int line, int column) {
051    return of(line, column, line, column);
052  }
053
054  public static PositionInSourceCode of(int startLine, int startColumn, int endLine, int endColumn) {
055    if (startLine <= 0 && endLine <= 0 && startColumn <= 0 && endColumn <= 0) {
056      return UNDEFINED;
057    }
058    return new PositionInSourceCode(startLine, startColumn, endLine, endColumn);
059  }
060
061  public int getStartLine() {
062    return startLine;
063  }
064
065  public int getStartColumn() {
066    return startColumn;
067  }
068
069  public int getEndLine() {
070    return endLine;
071  }
072
073  public int getEndColumn() {
074    return endColumn;
075  }
076
077  public boolean isUndefined() {
078    return false;
079  }
080
081  @Override
082  public String toString() {
083    if (startLine == endLine && startColumn == endColumn) {
084      return String.format("{line=%d, column=%d}", startLine, startColumn);
085    }
086    return String.format("{from=%d;%d, to=%d;%d}", startLine, startColumn, endLine, endColumn);
087  }
088
089  @Override
090  public boolean equals(Object o) {
091    if (this == o) { return true; }
092    if (o == null || getClass() != o.getClass()) { return false; }
093    PositionInSourceCode that = (PositionInSourceCode) o;
094    return startColumn == that.startColumn
095      && startLine == that.startLine
096      && endLine == that.endLine
097      && endColumn == that.endColumn;
098  }
099
100  @Override
101  public int hashCode() {
102    return java.util.Objects.hash(startLine, startColumn, endLine, endColumn);
103  }
104}