How to use PathNode class of org.assertj.core.util.diff.myers package

Best Assertj code snippet using org.assertj.core.util.diff.myers.PathNode

Source:MyersDiff.java

...52  @Override53  public Patch<T> diff(final List<T> original, final List<T> revised) {54    checkArgument(original != null, "original list must not be null");55    checkArgument(revised != null, "revised list must not be null");56    PathNode path;57    try {58      path = buildPath(original, revised);59      return buildRevision(path, original, revised);60    } catch (IllegalStateException e) {61      e.printStackTrace();62      return new Patch<>();63    }64  }65  /**66   * Computes the minimum diffpath that expresses de differences67   * between the original and revised sequences, according68   * to Gene Myers differencing algorithm.69   *70   * @param orig The original sequence.71   * @param rev The revised sequence.72   * @return A minimum {@link PathNode Path} across the differences graph.73   * @throws IllegalStateException if a diff path could not be found.74   */75  public PathNode buildPath(final List<T> orig, final List<T> rev) {76    checkArgument(orig != null, "original sequence is null");77    checkArgument(rev != null, "revised sequence is null");78    // these are local constants79    final int N = orig.size();80    final int M = rev.size();81    final int MAX = N + M + 1;82    final int size = 1 + 2 * MAX;83    final int middle = size / 2;84    final PathNode[] diagonal = new PathNode[size];85    diagonal[middle + 1] = new Snake(0, -1, null);86    for (int d = 0; d < MAX; d++) {87      for (int k = -d; k <= d; k += 2) {88        final int kmiddle = middle + k;89        final int kplus = kmiddle + 1;90        final int kminus = kmiddle - 1;91        PathNode prev;92        int i;93        if ((k == -d) || (k != d && diagonal[kminus].i < diagonal[kplus].i)) {94          i = diagonal[kplus].i;95          prev = diagonal[kplus];96        } else {97          i = diagonal[kminus].i + 1;98          prev = diagonal[kminus];99        }100        diagonal[kminus] = null; // no longer used101        int j = i - k;102        PathNode node = new DiffNode(i, j, prev);103        // orig and rev are zero-based104        // but the algorithm is one-based105        // that's why there's no +1 when indexing the sequences106        while (i < N && j < M && equals(orig.get(i), rev.get(j))) {107          i++;108          j++;109        }110        if (i > node.i) node = new Snake(i, j, node);111        diagonal[kmiddle] = node;112        if (i >= N && j >= M) return diagonal[kmiddle];113      }114      diagonal[middle + d - 1] = null;115    }116    // According to Myers, this cannot happen117    throw new IllegalStateException("could not find a diff path");118  }119  private boolean equals(T orig, T rev) {120    return equalizer.equals(orig, rev);121  }122  /**123   * Constructs a {@link Patch} from a difference path.124   *125   * @param path The path.126   * @param orig The original sequence.127   * @param rev The revised sequence.128   * @return A {@link Patch} script corresponding to the path.129   */130  public Patch<T> buildRevision(PathNode path, List<T> orig, List<T> rev) {131    checkArgument(path != null, "path is null");132    checkArgument(orig != null, "original sequence is null");133    checkArgument(rev != null, "revised sequence is null");134    Patch<T> patch = new Patch<>();135    if (path.isSnake())136      path = path.prev;137    while (path != null && path.prev != null && path.prev.j >= 0) {138      checkState(!path.isSnake(), "bad diffpath: found snake when looking for diff");139      int i = path.i;140      int j = path.j;141      path = path.prev;142      int ianchor = path.i;143      int janchor = path.j;144      Chunk<T> original = new Chunk<>(ianchor, copyOfRange(orig, ianchor, i));...

PathNode

Using AI Code Generation

1import org.assertj.core.util.diff.myers.*;2import java.util.*;3public class DiffRowGeneratorTest {4    public static void main(String[] args) {5        List<String> original = Arrays.asList("a", "b", "c");6        List<String> revised = Arrays.asList("a", "c", "b");7        Patch<String> patch = DiffUtils.diff(original, revised);8        for (Delta<String> delta : patch.getDeltas()) {9            System.out.println(delta);10        }11        List<DiffRow> diff = DiffRowGenerator.create().generateDiffRows(original, revised);12        for (DiffRow row : diff) {13            System.out.println(row);14        }15    }16}17[DiffRow{tag=CHANGE, oldLine=1, newLine=1, oldLineTag='a', newLineTag='a'}]18[DiffRow{tag=DELETE, oldLine=2, newLine=-1, oldLineTag='b', newLineTag=''}]19[DiffRow{tag=INSERT, oldLine=-1, newLine=2, oldLineTag='', newLineTag='c'}]20[DiffRow{tag=INSERT, oldLine=-1, newLine=3, oldLineTag='', newLineTag='b'}]

Automation Testing Tutorials

Learn to execute automation testing from scratch with LambdaTest Learning Hub. Right from setting up the prerequisites to run your first automation test, to following best practices and diving deeper into advanced test scenarios. LambdaTest Learning Hubs compile a list of step-by-step guides to help you be proficient with different test automation frameworks i.e. Selenium, Cypress, TestNG etc.