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node_modules/jest-diff/build/cleanupSemantic.js

@@ -0,0 +1,653 @@
+'use strict';
+
+Object.defineProperty(exports, '__esModule', {
+  value: true
+});
+exports.cleanupSemantic = exports.DIFF_INSERT = exports.DIFF_DELETE = exports.DIFF_EQUAL = exports.Diff = void 0;
+
+function _defineProperty(obj, key, value) {
+  if (key in obj) {
+    Object.defineProperty(obj, key, {
+      value: value,
+      enumerable: true,
+      configurable: true,
+      writable: true
+    });
+  } else {
+    obj[key] = value;
+  }
+  return obj;
+}
+
+/**
+ * Diff Match and Patch
+ * Copyright 2018 The diff-match-patch Authors.
+ * https://github.com/google/diff-match-patch
+ *
+ * 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.
+ */
+
+/**
+ * @fileoverview Computes the difference between two texts to create a patch.
+ * Applies the patch onto another text, allowing for errors.
+ * @author fraser@google.com (Neil Fraser)
+ */
+
+/**
+ * CHANGES by pedrottimark to diff_match_patch_uncompressed.ts file:
+ *
+ * 1. Delete anything not needed to use diff_cleanupSemantic method
+ * 2. Convert from prototype properties to var declarations
+ * 3. Convert Diff to class from constructor and prototype
+ * 4. Add type annotations for arguments and return values
+ * 5. Add exports
+ */
+
+/**
+ * The data structure representing a diff is an array of tuples:
+ * [[DIFF_DELETE, 'Hello'], [DIFF_INSERT, 'Goodbye'], [DIFF_EQUAL, ' world.']]
+ * which means: delete 'Hello', add 'Goodbye' and keep ' world.'
+ */
+var DIFF_DELETE = -1;
+exports.DIFF_DELETE = DIFF_DELETE;
+var DIFF_INSERT = 1;
+exports.DIFF_INSERT = DIFF_INSERT;
+var DIFF_EQUAL = 0;
+/**
+ * Class representing one diff tuple.
+ * Attempts to look like a two-element array (which is what this used to be).
+ * @param {number} op Operation, one of: DIFF_DELETE, DIFF_INSERT, DIFF_EQUAL.
+ * @param {string} text Text to be deleted, inserted, or retained.
+ * @constructor
+ */
+
+exports.DIFF_EQUAL = DIFF_EQUAL;
+
+class Diff {
+  constructor(op, text) {
+    _defineProperty(this, 0, void 0);
+
+    _defineProperty(this, 1, void 0);
+
+    this[0] = op;
+    this[1] = text;
+  }
+}
+/**
+ * Determine the common prefix of two strings.
+ * @param {string} text1 First string.
+ * @param {string} text2 Second string.
+ * @return {number} The number of characters common to the start of each
+ *     string.
+ */
+
+exports.Diff = Diff;
+
+var diff_commonPrefix = function diff_commonPrefix(text1, text2) {
+  // Quick check for common null cases.
+  if (!text1 || !text2 || text1.charAt(0) != text2.charAt(0)) {
+    return 0;
+  } // Binary search.
+  // Performance analysis: https://neil.fraser.name/news/2007/10/09/
+
+  var pointermin = 0;
+  var pointermax = Math.min(text1.length, text2.length);
+  var pointermid = pointermax;
+  var pointerstart = 0;
+
+  while (pointermin < pointermid) {
+    if (
+      text1.substring(pointerstart, pointermid) ==
+      text2.substring(pointerstart, pointermid)
+    ) {
+      pointermin = pointermid;
+      pointerstart = pointermin;
+    } else {
+      pointermax = pointermid;
+    }
+
+    pointermid = Math.floor((pointermax - pointermin) / 2 + pointermin);
+  }
+
+  return pointermid;
+};
+/**
+ * Determine the common suffix of two strings.
+ * @param {string} text1 First string.
+ * @param {string} text2 Second string.
+ * @return {number} The number of characters common to the end of each string.
+ */
+
+var diff_commonSuffix = function diff_commonSuffix(text1, text2) {
+  // Quick check for common null cases.
+  if (
+    !text1 ||
+    !text2 ||
+    text1.charAt(text1.length - 1) != text2.charAt(text2.length - 1)
+  ) {
+    return 0;
+  } // Binary search.
+  // Performance analysis: https://neil.fraser.name/news/2007/10/09/
+
+  var pointermin = 0;
+  var pointermax = Math.min(text1.length, text2.length);
+  var pointermid = pointermax;
+  var pointerend = 0;
+
+  while (pointermin < pointermid) {
+    if (
+      text1.substring(text1.length - pointermid, text1.length - pointerend) ==
+      text2.substring(text2.length - pointermid, text2.length - pointerend)
+    ) {
+      pointermin = pointermid;
+      pointerend = pointermin;
+    } else {
+      pointermax = pointermid;
+    }
+
+    pointermid = Math.floor((pointermax - pointermin) / 2 + pointermin);
+  }
+
+  return pointermid;
+};
+/**
+ * Determine if the suffix of one string is the prefix of another.
+ * @param {string} text1 First string.
+ * @param {string} text2 Second string.
+ * @return {number} The number of characters common to the end of the first
+ *     string and the start of the second string.
+ * @private
+ */
+
+var diff_commonOverlap_ = function diff_commonOverlap_(text1, text2) {
+  // Cache the text lengths to prevent multiple calls.
+  var text1_length = text1.length;
+  var text2_length = text2.length; // Eliminate the null case.
+
+  if (text1_length == 0 || text2_length == 0) {
+    return 0;
+  } // Truncate the longer string.
+
+  if (text1_length > text2_length) {
+    text1 = text1.substring(text1_length - text2_length);
+  } else if (text1_length < text2_length) {
+    text2 = text2.substring(0, text1_length);
+  }
+
+  var text_length = Math.min(text1_length, text2_length); // Quick check for the worst case.
+
+  if (text1 == text2) {
+    return text_length;
+  } // Start by looking for a single character match
+  // and increase length until no match is found.
+  // Performance analysis: https://neil.fraser.name/news/2010/11/04/
+
+  var best = 0;
+  var length = 1;
+
+  while (true) {
+    var pattern = text1.substring(text_length - length);
+    var found = text2.indexOf(pattern);
+
+    if (found == -1) {
+      return best;
+    }
+
+    length += found;
+
+    if (
+      found == 0 ||
+      text1.substring(text_length - length) == text2.substring(0, length)
+    ) {
+      best = length;
+      length++;
+    }
+  }
+};
+/**
+ * Reduce the number of edits by eliminating semantically trivial equalities.
+ * @param {!Array.<!diff_match_patch.Diff>} diffs Array of diff tuples.
+ */
+
+var diff_cleanupSemantic = function diff_cleanupSemantic(diffs) {
+  var changes = false;
+  var equalities = []; // Stack of indices where equalities are found.
+
+  var equalitiesLength = 0; // Keeping our own length var is faster in JS.
+
+  /** @type {?string} */
+
+  var lastEquality = null; // Always equal to diffs[equalities[equalitiesLength - 1]][1]
+
+  var pointer = 0; // Index of current position.
+  // Number of characters that changed prior to the equality.
+
+  var length_insertions1 = 0;
+  var length_deletions1 = 0; // Number of characters that changed after the equality.
+
+  var length_insertions2 = 0;
+  var length_deletions2 = 0;
+
+  while (pointer < diffs.length) {
+    if (diffs[pointer][0] == DIFF_EQUAL) {
+      // Equality found.
+      equalities[equalitiesLength++] = pointer;
+      length_insertions1 = length_insertions2;
+      length_deletions1 = length_deletions2;
+      length_insertions2 = 0;
+      length_deletions2 = 0;
+      lastEquality = diffs[pointer][1];
+    } else {
+      // An insertion or deletion.
+      if (diffs[pointer][0] == DIFF_INSERT) {
+        length_insertions2 += diffs[pointer][1].length;
+      } else {
+        length_deletions2 += diffs[pointer][1].length;
+      } // Eliminate an equality that is smaller or equal to the edits on both
+      // sides of it.
+
+      if (
+        lastEquality &&
+        lastEquality.length <=
+          Math.max(length_insertions1, length_deletions1) &&
+        lastEquality.length <= Math.max(length_insertions2, length_deletions2)
+      ) {
+        // Duplicate record.
+        diffs.splice(
+          equalities[equalitiesLength - 1],
+          0,
+          new Diff(DIFF_DELETE, lastEquality)
+        ); // Change second copy to insert.
+
+        diffs[equalities[equalitiesLength - 1] + 1][0] = DIFF_INSERT; // Throw away the equality we just deleted.
+
+        equalitiesLength--; // Throw away the previous equality (it needs to be reevaluated).
+
+        equalitiesLength--;
+        pointer = equalitiesLength > 0 ? equalities[equalitiesLength - 1] : -1;
+        length_insertions1 = 0; // Reset the counters.
+
+        length_deletions1 = 0;
+        length_insertions2 = 0;
+        length_deletions2 = 0;
+        lastEquality = null;
+        changes = true;
+      }
+    }
+
+    pointer++;
+  } // Normalize the diff.
+
+  if (changes) {
+    diff_cleanupMerge(diffs);
+  }
+
+  diff_cleanupSemanticLossless(diffs); // Find any overlaps between deletions and insertions.
+  // e.g: <del>abcxxx</del><ins>xxxdef</ins>
+  //   -> <del>abc</del>xxx<ins>def</ins>
+  // e.g: <del>xxxabc</del><ins>defxxx</ins>
+  //   -> <ins>def</ins>xxx<del>abc</del>
+  // Only extract an overlap if it is as big as the edit ahead or behind it.
+
+  pointer = 1;
+
+  while (pointer < diffs.length) {
+    if (
+      diffs[pointer - 1][0] == DIFF_DELETE &&
+      diffs[pointer][0] == DIFF_INSERT
+    ) {
+      var deletion = diffs[pointer - 1][1];
+      var insertion = diffs[pointer][1];
+      var overlap_length1 = diff_commonOverlap_(deletion, insertion);
+      var overlap_length2 = diff_commonOverlap_(insertion, deletion);
+
+      if (overlap_length1 >= overlap_length2) {
+        if (
+          overlap_length1 >= deletion.length / 2 ||
+          overlap_length1 >= insertion.length / 2
+        ) {
+          // Overlap found.  Insert an equality and trim the surrounding edits.
+          diffs.splice(
+            pointer,
+            0,
+            new Diff(DIFF_EQUAL, insertion.substring(0, overlap_length1))
+          );
+          diffs[pointer - 1][1] = deletion.substring(
+            0,
+            deletion.length - overlap_length1
+          );
+          diffs[pointer + 1][1] = insertion.substring(overlap_length1);
+          pointer++;
+        }
+      } else {
+        if (
+          overlap_length2 >= deletion.length / 2 ||
+          overlap_length2 >= insertion.length / 2
+        ) {
+          // Reverse overlap found.
+          // Insert an equality and swap and trim the surrounding edits.
+          diffs.splice(
+            pointer,
+            0,
+            new Diff(DIFF_EQUAL, deletion.substring(0, overlap_length2))
+          );
+          diffs[pointer - 1][0] = DIFF_INSERT;
+          diffs[pointer - 1][1] = insertion.substring(
+            0,
+            insertion.length - overlap_length2
+          );
+          diffs[pointer + 1][0] = DIFF_DELETE;
+          diffs[pointer + 1][1] = deletion.substring(overlap_length2);
+          pointer++;
+        }
+      }
+
+      pointer++;
+    }
+
+    pointer++;
+  }
+};
+/**
+ * Look for single edits surrounded on both sides by equalities
+ * which can be shifted sideways to align the edit to a word boundary.
+ * e.g: The c<ins>at c</ins>ame. -> The <ins>cat </ins>came.
+ * @param {!Array.<!diff_match_patch.Diff>} diffs Array of diff tuples.
+ */
+
+exports.cleanupSemantic = diff_cleanupSemantic;
+
+var diff_cleanupSemanticLossless = function diff_cleanupSemanticLossless(
+  diffs
+) {
+  /**
+   * Given two strings, compute a score representing whether the internal
+   * boundary falls on logical boundaries.
+   * Scores range from 6 (best) to 0 (worst).
+   * Closure, but does not reference any external variables.
+   * @param {string} one First string.
+   * @param {string} two Second string.
+   * @return {number} The score.
+   * @private
+   */
+  function diff_cleanupSemanticScore_(one, two) {
+    if (!one || !two) {
+      // Edges are the best.
+      return 6;
+    } // Each port of this function behaves slightly differently due to
+    // subtle differences in each language's definition of things like
+    // 'whitespace'.  Since this function's purpose is largely cosmetic,
+    // the choice has been made to use each language's native features
+    // rather than force total conformity.
+
+    var char1 = one.charAt(one.length - 1);
+    var char2 = two.charAt(0);
+    var nonAlphaNumeric1 = char1.match(nonAlphaNumericRegex_);
+    var nonAlphaNumeric2 = char2.match(nonAlphaNumericRegex_);
+    var whitespace1 = nonAlphaNumeric1 && char1.match(whitespaceRegex_);
+    var whitespace2 = nonAlphaNumeric2 && char2.match(whitespaceRegex_);
+    var lineBreak1 = whitespace1 && char1.match(linebreakRegex_);
+    var lineBreak2 = whitespace2 && char2.match(linebreakRegex_);
+    var blankLine1 = lineBreak1 && one.match(blanklineEndRegex_);
+    var blankLine2 = lineBreak2 && two.match(blanklineStartRegex_);
+
+    if (blankLine1 || blankLine2) {
+      // Five points for blank lines.
+      return 5;
+    } else if (lineBreak1 || lineBreak2) {
+      // Four points for line breaks.
+      return 4;
+    } else if (nonAlphaNumeric1 && !whitespace1 && whitespace2) {
+      // Three points for end of sentences.
+      return 3;
+    } else if (whitespace1 || whitespace2) {
+      // Two points for whitespace.
+      return 2;
+    } else if (nonAlphaNumeric1 || nonAlphaNumeric2) {
+      // One point for non-alphanumeric.
+      return 1;
+    }
+
+    return 0;
+  }
+
+  var pointer = 1; // Intentionally ignore the first and last element (don't need checking).
+
+  while (pointer < diffs.length - 1) {
+    if (
+      diffs[pointer - 1][0] == DIFF_EQUAL &&
+      diffs[pointer + 1][0] == DIFF_EQUAL
+    ) {
+      // This is a single edit surrounded by equalities.
+      var equality1 = diffs[pointer - 1][1];
+      var edit = diffs[pointer][1];
+      var equality2 = diffs[pointer + 1][1]; // First, shift the edit as far left as possible.
+
+      var commonOffset = diff_commonSuffix(equality1, edit);
+
+      if (commonOffset) {
+        var commonString = edit.substring(edit.length - commonOffset);
+        equality1 = equality1.substring(0, equality1.length - commonOffset);
+        edit = commonString + edit.substring(0, edit.length - commonOffset);
+        equality2 = commonString + equality2;
+      } // Second, step character by character right, looking for the best fit.
+
+      var bestEquality1 = equality1;
+      var bestEdit = edit;
+      var bestEquality2 = equality2;
+      var bestScore =
+        diff_cleanupSemanticScore_(equality1, edit) +
+        diff_cleanupSemanticScore_(edit, equality2);
+
+      while (edit.charAt(0) === equality2.charAt(0)) {
+        equality1 += edit.charAt(0);
+        edit = edit.substring(1) + equality2.charAt(0);
+        equality2 = equality2.substring(1);
+        var score =
+          diff_cleanupSemanticScore_(equality1, edit) +
+          diff_cleanupSemanticScore_(edit, equality2); // The >= encourages trailing rather than leading whitespace on edits.
+
+        if (score >= bestScore) {
+          bestScore = score;
+          bestEquality1 = equality1;
+          bestEdit = edit;
+          bestEquality2 = equality2;
+        }
+      }
+
+      if (diffs[pointer - 1][1] != bestEquality1) {
+        // We have an improvement, save it back to the diff.
+        if (bestEquality1) {
+          diffs[pointer - 1][1] = bestEquality1;
+        } else {
+          diffs.splice(pointer - 1, 1);
+          pointer--;
+        }
+
+        diffs[pointer][1] = bestEdit;
+
+        if (bestEquality2) {
+          diffs[pointer + 1][1] = bestEquality2;
+        } else {
+          diffs.splice(pointer + 1, 1);
+          pointer--;
+        }
+      }
+    }
+
+    pointer++;
+  }
+}; // Define some regex patterns for matching boundaries.
+
+var nonAlphaNumericRegex_ = /[^a-zA-Z0-9]/;
+var whitespaceRegex_ = /\s/;
+var linebreakRegex_ = /[\r\n]/;
+var blanklineEndRegex_ = /\n\r?\n$/;
+var blanklineStartRegex_ = /^\r?\n\r?\n/;
+/**
+ * Reorder and merge like edit sections.  Merge equalities.
+ * Any edit section can move as long as it doesn't cross an equality.
+ * @param {!Array.<!diff_match_patch.Diff>} diffs Array of diff tuples.
+ */
+
+var diff_cleanupMerge = function diff_cleanupMerge(diffs) {
+  // Add a dummy entry at the end.
+  diffs.push(new Diff(DIFF_EQUAL, ''));
+  var pointer = 0;
+  var count_delete = 0;
+  var count_insert = 0;
+  var text_delete = '';
+  var text_insert = '';
+  var commonlength;
+
+  while (pointer < diffs.length) {
+    switch (diffs[pointer][0]) {
+      case DIFF_INSERT:
+        count_insert++;
+        text_insert += diffs[pointer][1];
+        pointer++;
+        break;
+
+      case DIFF_DELETE:
+        count_delete++;
+        text_delete += diffs[pointer][1];
+        pointer++;
+        break;
+
+      case DIFF_EQUAL:
+        // Upon reaching an equality, check for prior redundancies.
+        if (count_delete + count_insert > 1) {
+          if (count_delete !== 0 && count_insert !== 0) {
+            // Factor out any common prefixies.
+            commonlength = diff_commonPrefix(text_insert, text_delete);
+
+            if (commonlength !== 0) {
+              if (
+                pointer - count_delete - count_insert > 0 &&
+                diffs[pointer - count_delete - count_insert - 1][0] ==
+                  DIFF_EQUAL
+              ) {
+                diffs[
+                  pointer - count_delete - count_insert - 1
+                ][1] += text_insert.substring(0, commonlength);
+              } else {
+                diffs.splice(
+                  0,
+                  0,
+                  new Diff(DIFF_EQUAL, text_insert.substring(0, commonlength))
+                );
+                pointer++;
+              }
+
+              text_insert = text_insert.substring(commonlength);
+              text_delete = text_delete.substring(commonlength);
+            } // Factor out any common suffixies.
+
+            commonlength = diff_commonSuffix(text_insert, text_delete);
+
+            if (commonlength !== 0) {
+              diffs[pointer][1] =
+                text_insert.substring(text_insert.length - commonlength) +
+                diffs[pointer][1];
+              text_insert = text_insert.substring(
+                0,
+                text_insert.length - commonlength
+              );
+              text_delete = text_delete.substring(
+                0,
+                text_delete.length - commonlength
+              );
+            }
+          } // Delete the offending records and add the merged ones.
+
+          pointer -= count_delete + count_insert;
+          diffs.splice(pointer, count_delete + count_insert);
+
+          if (text_delete.length) {
+            diffs.splice(pointer, 0, new Diff(DIFF_DELETE, text_delete));
+            pointer++;
+          }
+
+          if (text_insert.length) {
+            diffs.splice(pointer, 0, new Diff(DIFF_INSERT, text_insert));
+            pointer++;
+          }
+
+          pointer++;
+        } else if (pointer !== 0 && diffs[pointer - 1][0] == DIFF_EQUAL) {
+          // Merge this equality with the previous one.
+          diffs[pointer - 1][1] += diffs[pointer][1];
+          diffs.splice(pointer, 1);
+        } else {
+          pointer++;
+        }
+
+        count_insert = 0;
+        count_delete = 0;
+        text_delete = '';
+        text_insert = '';
+        break;
+    }
+  }
+
+  if (diffs[diffs.length - 1][1] === '') {
+    diffs.pop(); // Remove the dummy entry at the end.
+  } // Second pass: look for single edits surrounded on both sides by equalities
+  // which can be shifted sideways to eliminate an equality.
+  // e.g: A<ins>BA</ins>C -> <ins>AB</ins>AC
+
+  var changes = false;
+  pointer = 1; // Intentionally ignore the first and last element (don't need checking).
+
+  while (pointer < diffs.length - 1) {
+    if (
+      diffs[pointer - 1][0] == DIFF_EQUAL &&
+      diffs[pointer + 1][0] == DIFF_EQUAL
+    ) {
+      // This is a single edit surrounded by equalities.
+      if (
+        diffs[pointer][1].substring(
+          diffs[pointer][1].length - diffs[pointer - 1][1].length
+        ) == diffs[pointer - 1][1]
+      ) {
+        // Shift the edit over the previous equality.
+        diffs[pointer][1] =
+          diffs[pointer - 1][1] +
+          diffs[pointer][1].substring(
+            0,
+            diffs[pointer][1].length - diffs[pointer - 1][1].length
+          );
+        diffs[pointer + 1][1] = diffs[pointer - 1][1] + diffs[pointer + 1][1];
+        diffs.splice(pointer - 1, 1);
+        changes = true;
+      } else if (
+        diffs[pointer][1].substring(0, diffs[pointer + 1][1].length) ==
+        diffs[pointer + 1][1]
+      ) {
+        // Shift the edit over the next equality.
+        diffs[pointer - 1][1] += diffs[pointer + 1][1];
+        diffs[pointer][1] =
+          diffs[pointer][1].substring(diffs[pointer + 1][1].length) +
+          diffs[pointer + 1][1];
+        diffs.splice(pointer + 1, 1);
+        changes = true;
+      }
+    }
+
+    pointer++;
+  } // If shifts were made, the diff needs reordering and another shift sweep.
+
+  if (changes) {
+    diff_cleanupMerge(diffs);
+  }
+};