@circuitly/diff
Version:
A javascript text diff implementation.
281 lines (274 loc) • 40.8 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.diffWords = diffWords;
exports.diffWordsWithSpace = diffWordsWithSpace;
exports.wordWithSpaceDiff = exports.wordDiff = void 0;
var _base = _interopRequireDefault(require("./base"));
var _string = require("../util/string");
function _interopRequireDefault(e) { return e && e.__esModule ? e : { "default": e }; }
// Based on https://en.wikipedia.org/wiki/Latin_script_in_Unicode
//
// Ranges and exceptions:
// Latin-1 Supplement, 0080–00FF
// - U+00D7 × Multiplication sign
// - U+00F7 ÷ Division sign
// Latin Extended-A, 0100–017F
// Latin Extended-B, 0180–024F
// IPA Extensions, 0250–02AF
// Spacing Modifier Letters, 02B0–02FF
// - U+02C7 ˇ ˇ Caron
// - U+02D8 ˘ ˘ Breve
// - U+02D9 ˙ ˙ Dot Above
// - U+02DA ˚ ˚ Ring Above
// - U+02DB ˛ ˛ Ogonek
// - U+02DC ˜ ˜ Small Tilde
// - U+02DD ˝ ˝ Double Acute Accent
// Latin Extended Additional, 1E00–1EFF
var extendedWordChars = "a-zA-Z0-9_\\u{C0}-\\u{FF}\\u{D8}-\\u{F6}\\u{F8}-\\u{2C6}\\u{2C8}-\\u{2D7}\\u{2DE}-\\u{2FF}\\u{1E00}-\\u{1EFF}";
// Each token is one of the following:
// - A punctuation mark plus the surrounding whitespace
// - A word plus the surrounding whitespace
// - Pure whitespace (but only in the special case where this the entire text
// is just whitespace)
//
// We have to include surrounding whitespace in the tokens because the two
// alternative approaches produce horribly broken results:
// * If we just discard the whitespace, we can't fully reproduce the original
// text from the sequence of tokens and any attempt to render the diff will
// get the whitespace wrong.
// * If we have separate tokens for whitespace, then in a typical text every
// second token will be a single space character. But this often results in
// the optimal diff between two texts being a perverse one that preserves
// the spaces between words but deletes and reinserts actual common words.
// See https://github.com/kpdecker/jsdiff/issues/160#issuecomment-1866099640
// for an example.
//
// Keeping the surrounding whitespace of course has implications for .equals
// and .join, not just .tokenize.
// This regex does NOT fully implement the tokenization rules described above.
// Instead, it gives runs of whitespace their own "token". The tokenize method
// then handles stitching whitespace tokens onto adjacent word or punctuation
// tokens.
var tokenizeIncludingWhitespace = new RegExp("[".concat(extendedWordChars, "]+|\\s+|[^").concat(extendedWordChars, "]"), 'ug');
var wordDiff = exports.wordDiff = new _base["default"]();
wordDiff.equals = function (left, right, options) {
if (options.ignoreCase) {
left = left.toLowerCase();
right = right.toLowerCase();
}
return left.trim() === right.trim();
};
wordDiff.tokenize = function (value) {
var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};
var parts;
if (options.intlSegmenter) {
if (options.intlSegmenter.resolvedOptions().granularity != 'word') {
throw new Error('The segmenter passed must have a granularity of "word"');
}
parts = Array.from(options.intlSegmenter.segment(value), function (segment) {
return segment.segment;
});
} else {
parts = value.match(tokenizeIncludingWhitespace) || [];
}
var tokens = [];
var prevPart = null;
parts.forEach(function (part) {
if (/\s/.test(part)) {
if (prevPart == null) {
tokens.push(part);
} else {
tokens.push(tokens.pop() + part);
}
} else if (/\s/.test(prevPart)) {
if (tokens[tokens.length - 1] == prevPart) {
tokens.push(tokens.pop() + part);
} else {
tokens.push(prevPart + part);
}
} else {
tokens.push(part);
}
prevPart = part;
});
return tokens;
};
wordDiff.join = function (tokens) {
// Tokens being joined here will always have appeared consecutively in the
// same text, so we can simply strip off the leading whitespace from all the
// tokens except the first (and except any whitespace-only tokens - but such
// a token will always be the first and only token anyway) and then join them
// and the whitespace around words and punctuation will end up correct.
return tokens.map(function (token, i) {
if (i == 0) {
return token;
} else {
return token.replace(/^\s+/, '');
}
}).join('');
};
wordDiff.postProcess = function (changes, options) {
if (!changes || options.oneChangePerToken) {
return changes;
}
var lastKeep = null;
// Change objects representing any insertion or deletion since the last
// "keep" change object. There can be at most one of each.
var insertion = null;
var deletion = null;
changes.forEach(function (change) {
if (change.added) {
insertion = change;
} else if (change.removed) {
deletion = change;
} else {
if (insertion || deletion) {
// May be false at start of text
dedupeWhitespaceInChangeObjects(lastKeep, deletion, insertion, change);
}
lastKeep = change;
insertion = null;
deletion = null;
}
});
if (insertion || deletion) {
dedupeWhitespaceInChangeObjects(lastKeep, deletion, insertion, null);
}
return changes;
};
function diffWords(oldStr, newStr, options) {
// This option has never been documented and never will be (it's clearer to
// just call `diffWordsWithSpace` directly if you need that behavior), but
// has existed in jsdiff for a long time, so we retain support for it here
// for the sake of backwards compatibility.
if ((options === null || options === void 0 ? void 0 : options.ignoreWhitespace) != null && !options.ignoreWhitespace) {
return diffWordsWithSpace(oldStr, newStr, options);
}
return wordDiff.diff(oldStr, newStr, options);
}
function dedupeWhitespaceInChangeObjects(startKeep, deletion, insertion, endKeep) {
// Before returning, we tidy up the leading and trailing whitespace of the
// change objects to eliminate cases where trailing whitespace in one object
// is repeated as leading whitespace in the next.
// Below are examples of the outcomes we want here to explain the code.
// I=insert, K=keep, D=delete
// 1. diffing 'foo bar baz' vs 'foo baz'
// Prior to cleanup, we have K:'foo ' D:' bar ' K:' baz'
// After cleanup, we want: K:'foo ' D:'bar ' K:'baz'
//
// 2. Diffing 'foo bar baz' vs 'foo qux baz'
// Prior to cleanup, we have K:'foo ' D:' bar ' I:' qux ' K:' baz'
// After cleanup, we want K:'foo ' D:'bar' I:'qux' K:' baz'
//
// 3. Diffing 'foo\nbar baz' vs 'foo baz'
// Prior to cleanup, we have K:'foo ' D:'\nbar ' K:' baz'
// After cleanup, we want K'foo' D:'\nbar' K:' baz'
//
// 4. Diffing 'foo baz' vs 'foo\nbar baz'
// Prior to cleanup, we have K:'foo\n' I:'\nbar ' K:' baz'
// After cleanup, we ideally want K'foo' I:'\nbar' K:' baz'
// but don't actually manage this currently (the pre-cleanup change
// objects don't contain enough information to make it possible).
//
// 5. Diffing 'foo bar baz' vs 'foo baz'
// Prior to cleanup, we have K:'foo ' D:' bar ' K:' baz'
// After cleanup, we want K:'foo ' D:' bar ' K:'baz'
//
// Our handling is unavoidably imperfect in the case where there's a single
// indel between keeps and the whitespace has changed. For instance, consider
// diffing 'foo\tbar\nbaz' vs 'foo baz'. Unless we create an extra change
// object to represent the insertion of the space character (which isn't even
// a token), we have no way to avoid losing information about the texts'
// original whitespace in the result we return. Still, we do our best to
// output something that will look sensible if we e.g. print it with
// insertions in green and deletions in red.
// Between two "keep" change objects (or before the first or after the last
// change object), we can have either:
// * A "delete" followed by an "insert"
// * Just an "insert"
// * Just a "delete"
// We handle the three cases separately.
if (deletion && insertion) {
var oldWsPrefix = (0, _string.leadingWs)(deletion.value);
var oldWsSuffix = (0, _string.trailingWs)(deletion.value);
var newWsPrefix = (0, _string.leadingWs)(insertion.value);
var newWsSuffix = (0, _string.trailingWs)(insertion.value);
if (startKeep) {
var commonWsPrefix = (0, _string.longestCommonPrefix)(oldWsPrefix, newWsPrefix);
startKeep.value = (0, _string.replaceSuffix)(startKeep.value, newWsPrefix, commonWsPrefix);
deletion.value = (0, _string.removePrefix)(deletion.value, commonWsPrefix);
insertion.value = (0, _string.removePrefix)(insertion.value, commonWsPrefix);
}
if (endKeep) {
var commonWsSuffix = (0, _string.longestCommonSuffix)(oldWsSuffix, newWsSuffix);
endKeep.value = (0, _string.replacePrefix)(endKeep.value, newWsSuffix, commonWsSuffix);
deletion.value = (0, _string.removeSuffix)(deletion.value, commonWsSuffix);
insertion.value = (0, _string.removeSuffix)(insertion.value, commonWsSuffix);
}
} else if (insertion) {
// The whitespaces all reflect what was in the new text rather than
// the old, so we essentially have no information about whitespace
// insertion or deletion. We just want to dedupe the whitespace.
// We do that by having each change object keep its trailing
// whitespace and deleting duplicate leading whitespace where
// present.
if (startKeep) {
var ws = (0, _string.leadingWs)(insertion.value);
insertion.value = insertion.value.substring(ws.length);
}
if (endKeep) {
var _ws = (0, _string.leadingWs)(endKeep.value);
endKeep.value = endKeep.value.substring(_ws.length);
}
// otherwise we've got a deletion and no insertion
} else if (startKeep && endKeep) {
var newWsFull = (0, _string.leadingWs)(endKeep.value),
delWsStart = (0, _string.leadingWs)(deletion.value),
delWsEnd = (0, _string.trailingWs)(deletion.value);
// Any whitespace that comes straight after startKeep in both the old and
// new texts, assign to startKeep and remove from the deletion.
var newWsStart = (0, _string.longestCommonPrefix)(newWsFull, delWsStart);
deletion.value = (0, _string.removePrefix)(deletion.value, newWsStart);
// Any whitespace that comes straight before endKeep in both the old and
// new texts, and hasn't already been assigned to startKeep, assign to
// endKeep and remove from the deletion.
var newWsEnd = (0, _string.longestCommonSuffix)((0, _string.removePrefix)(newWsFull, newWsStart), delWsEnd);
deletion.value = (0, _string.removeSuffix)(deletion.value, newWsEnd);
endKeep.value = (0, _string.replacePrefix)(endKeep.value, newWsFull, newWsEnd);
// If there's any whitespace from the new text that HASN'T already been
// assigned, assign it to the start:
startKeep.value = (0, _string.replaceSuffix)(startKeep.value, newWsFull, newWsFull.slice(0, newWsFull.length - newWsEnd.length));
} else if (endKeep) {
// We are at the start of the text. Preserve all the whitespace on
// endKeep, and just remove whitespace from the end of deletion to the
// extent that it overlaps with the start of endKeep.
var endKeepWsPrefix = (0, _string.leadingWs)(endKeep.value);
var deletionWsSuffix = (0, _string.trailingWs)(deletion.value);
var overlap = (0, _string.maximumOverlap)(deletionWsSuffix, endKeepWsPrefix);
deletion.value = (0, _string.removeSuffix)(deletion.value, overlap);
} else if (startKeep) {
// We are at the END of the text. Preserve all the whitespace on
// startKeep, and just remove whitespace from the start of deletion to
// the extent that it overlaps with the end of startKeep.
var startKeepWsSuffix = (0, _string.trailingWs)(startKeep.value);
var deletionWsPrefix = (0, _string.leadingWs)(deletion.value);
var _overlap = (0, _string.maximumOverlap)(startKeepWsSuffix, deletionWsPrefix);
deletion.value = (0, _string.removePrefix)(deletion.value, _overlap);
}
}
var wordWithSpaceDiff = exports.wordWithSpaceDiff = new _base["default"]();
wordWithSpaceDiff.tokenize = function (value) {
// Slightly different to the tokenizeIncludingWhitespace regex used above in
// that this one treats each individual newline as a distinct tokens, rather
// than merging them into other surrounding whitespace. This was requested
// in https://github.com/kpdecker/jsdiff/issues/180 &
// https://github.com/kpdecker/jsdiff/issues/211
var regex = new RegExp("(\\r?\\n)|[".concat(extendedWordChars, "]+|[^\\S\\n\\r]+|[^").concat(extendedWordChars, "]"), 'ug');
return value.match(regex) || [];
};
function diffWordsWithSpace(oldStr, newStr, options) {
return wordWithSpaceDiff.diff(oldStr, newStr, options);
}
//# sourceMappingURL=data:application/json;charset=utf-8;base64,{"version":3,"names":["_base","_interopRequireDefault","require","_string","e","__esModule","extendedWordChars","tokenizeIncludingWhitespace","RegExp","concat","wordDiff","exports","Diff","equals","left","right","options","ignoreCase","toLowerCase","trim","tokenize","value","arguments","length","undefined","parts","intlSegmenter","resolvedOptions","granularity","Error","Array","from","segment","match","tokens","prevPart","forEach","part","test","push","pop","join","map","token","i","replace","postProcess","changes","oneChangePerToken","lastKeep","insertion","deletion","change","added","removed","dedupeWhitespaceInChangeObjects","diffWords","oldStr","newStr","ignoreWhitespace","diffWordsWithSpace","diff","startKeep","endKeep","oldWsPrefix","leadingWs","oldWsSuffix","trailingWs","newWsPrefix","newWsSuffix","commonWsPrefix","longestCommonPrefix","replaceSuffix","removePrefix","commonWsSuffix","longestCommonSuffix","replacePrefix","removeSuffix","ws","substring","newWsFull","delWsStart","delWsEnd","newWsStart","newWsEnd","slice","endKeepWsPrefix","deletionWsSuffix","overlap","maximumOverlap","startKeepWsSuffix","deletionWsPrefix","wordWithSpaceDiff","regex"],"sources":["../../src/diff/word.js"],"sourcesContent":["import Diff from './base';\nimport { longestCommonPrefix, longestCommonSuffix, replacePrefix, replaceSuffix, removePrefix, removeSuffix, maximumOverlap, leadingWs, trailingWs } from '../util/string';\n\n// Based on https://en.wikipedia.org/wiki/Latin_script_in_Unicode\n//\n// Ranges and exceptions:\n// Latin-1 Supplement, 0080–00FF\n//  - U+00D7  × Multiplication sign\n//  - U+00F7  ÷ Division sign\n// Latin Extended-A, 0100–017F\n// Latin Extended-B, 0180–024F\n// IPA Extensions, 0250–02AF\n// Spacing Modifier Letters, 02B0–02FF\n//  - U+02C7  ˇ &#711;  Caron\n//  - U+02D8  ˘ &#728;  Breve\n//  - U+02D9  ˙ &#729;  Dot Above\n//  - U+02DA  ˚ &#730;  Ring Above\n//  - U+02DB  ˛ &#731;  Ogonek\n//  - U+02DC  ˜ &#732;  Small Tilde\n//  - U+02DD  ˝ &#733;  Double Acute Accent\n// Latin Extended Additional, 1E00–1EFF\nconst extendedWordChars = 'a-zA-Z0-9_\\\\u{C0}-\\\\u{FF}\\\\u{D8}-\\\\u{F6}\\\\u{F8}-\\\\u{2C6}\\\\u{2C8}-\\\\u{2D7}\\\\u{2DE}-\\\\u{2FF}\\\\u{1E00}-\\\\u{1EFF}';\n\n// Each token is one of the following:\n// - A punctuation mark plus the surrounding whitespace\n// - A word plus the surrounding whitespace\n// - Pure whitespace (but only in the special case where this the entire text\n//   is just whitespace)\n//\n// We have to include surrounding whitespace in the tokens because the two\n// alternative approaches produce horribly broken results:\n// * If we just discard the whitespace, we can't fully reproduce the original\n//   text from the sequence of tokens and any attempt to render the diff will\n//   get the whitespace wrong.\n// * If we have separate tokens for whitespace, then in a typical text every\n//   second token will be a single space character. But this often results in\n//   the optimal diff between two texts being a perverse one that preserves\n//   the spaces between words but deletes and reinserts actual common words.\n//   See https://github.com/kpdecker/jsdiff/issues/160#issuecomment-1866099640\n//   for an example.\n//\n// Keeping the surrounding whitespace of course has implications for .equals\n// and .join, not just .tokenize.\n\n// This regex does NOT fully implement the tokenization rules described above.\n// Instead, it gives runs of whitespace their own \"token\". The tokenize method\n// then handles stitching whitespace tokens onto adjacent word or punctuation\n// tokens.\nconst tokenizeIncludingWhitespace = new RegExp(`[${extendedWordChars}]+|\\\\s+|[^${extendedWordChars}]`, 'ug');\n\nexport const wordDiff = new Diff();\nwordDiff.equals = function(left, right, options) {\n  if (options.ignoreCase) {\n    left = left.toLowerCase();\n    right = right.toLowerCase();\n  }\n\n  return left.trim() === right.trim();\n};\n\nwordDiff.tokenize = function(value, options = {}) {\n  let parts;\n  if (options.intlSegmenter) {\n    if (options.intlSegmenter.resolvedOptions().granularity != 'word') {\n      throw new Error('The segmenter passed must have a granularity of \"word\"');\n    }\n    parts = Array.from(options.intlSegmenter.segment(value), segment => segment.segment);\n  } else {\n    parts = value.match(tokenizeIncludingWhitespace) || [];\n  }\n  const tokens = [];\n  let prevPart = null;\n  parts.forEach(part => {\n    if ((/\\s/).test(part)) {\n      if (prevPart == null) {\n        tokens.push(part);\n      } else {\n        tokens.push(tokens.pop() + part);\n      }\n    } else if ((/\\s/).test(prevPart)) {\n      if (tokens[tokens.length - 1] == prevPart) {\n        tokens.push(tokens.pop() + part);\n      } else {\n        tokens.push(prevPart + part);\n      }\n    } else {\n      tokens.push(part);\n    }\n\n    prevPart = part;\n  });\n  return tokens;\n};\n\nwordDiff.join = function(tokens) {\n  // Tokens being joined here will always have appeared consecutively in the\n  // same text, so we can simply strip off the leading whitespace from all the\n  // tokens except the first (and except any whitespace-only tokens - but such\n  // a token will always be the first and only token anyway) and then join them\n  // and the whitespace around words and punctuation will end up correct.\n  return tokens.map((token, i) => {\n    if (i == 0) {\n      return token;\n    } else {\n      return token.replace((/^\\s+/), '');\n    }\n  }).join('');\n};\n\nwordDiff.postProcess = function(changes, options) {\n  if (!changes || options.oneChangePerToken) {\n    return changes;\n  }\n\n  let lastKeep = null;\n  // Change objects representing any insertion or deletion since the last\n  // \"keep\" change object. There can be at most one of each.\n  let insertion = null;\n  let deletion = null;\n  changes.forEach(change => {\n    if (change.added) {\n      insertion = change;\n    } else if (change.removed) {\n      deletion = change;\n    } else {\n      if (insertion || deletion) { // May be false at start of text\n        dedupeWhitespaceInChangeObjects(lastKeep, deletion, insertion, change);\n      }\n      lastKeep = change;\n      insertion = null;\n      deletion = null;\n    }\n  });\n  if (insertion || deletion) {\n    dedupeWhitespaceInChangeObjects(lastKeep, deletion, insertion, null);\n  }\n  return changes;\n};\n\nexport function diffWords(oldStr, newStr, options) {\n  // This option has never been documented and never will be (it's clearer to\n  // just call `diffWordsWithSpace` directly if you need that behavior), but\n  // has existed in jsdiff for a long time, so we retain support for it here\n  // for the sake of backwards compatibility.\n  if (options?.ignoreWhitespace != null && !options.ignoreWhitespace) {\n    return diffWordsWithSpace(oldStr, newStr, options);\n  }\n\n  return wordDiff.diff(oldStr, newStr, options);\n}\n\nfunction dedupeWhitespaceInChangeObjects(startKeep, deletion, insertion, endKeep) {\n  // Before returning, we tidy up the leading and trailing whitespace of the\n  // change objects to eliminate cases where trailing whitespace in one object\n  // is repeated as leading whitespace in the next.\n  // Below are examples of the outcomes we want here to explain the code.\n  // I=insert, K=keep, D=delete\n  // 1. diffing 'foo bar baz' vs 'foo baz'\n  //    Prior to cleanup, we have K:'foo ' D:' bar ' K:' baz'\n  //    After cleanup, we want:   K:'foo ' D:'bar ' K:'baz'\n  //\n  // 2. Diffing 'foo bar baz' vs 'foo qux baz'\n  //    Prior to cleanup, we have K:'foo ' D:' bar ' I:' qux ' K:' baz'\n  //    After cleanup, we want K:'foo ' D:'bar' I:'qux' K:' baz'\n  //\n  // 3. Diffing 'foo\\nbar baz' vs 'foo baz'\n  //    Prior to cleanup, we have K:'foo ' D:'\\nbar ' K:' baz'\n  //    After cleanup, we want K'foo' D:'\\nbar' K:' baz'\n  //\n  // 4. Diffing 'foo baz' vs 'foo\\nbar baz'\n  //    Prior to cleanup, we have K:'foo\\n' I:'\\nbar ' K:' baz'\n  //    After cleanup, we ideally want K'foo' I:'\\nbar' K:' baz'\n  //    but don't actually manage this currently (the pre-cleanup change\n  //    objects don't contain enough information to make it possible).\n  //\n  // 5. Diffing 'foo   bar baz' vs 'foo  baz'\n  //    Prior to cleanup, we have K:'foo  ' D:'   bar ' K:'  baz'\n  //    After cleanup, we want K:'foo  ' D:' bar ' K:'baz'\n  //\n  // Our handling is unavoidably imperfect in the case where there's a single\n  // indel between keeps and the whitespace has changed. For instance, consider\n  // diffing 'foo\\tbar\\nbaz' vs 'foo baz'. Unless we create an extra change\n  // object to represent the insertion of the space character (which isn't even\n  // a token), we have no way to avoid losing information about the texts'\n  // original whitespace in the result we return. Still, we do our best to\n  // output something that will look sensible if we e.g. print it with\n  // insertions in green and deletions in red.\n\n  // Between two \"keep\" change objects (or before the first or after the last\n  // change object), we can have either:\n  // * A \"delete\" followed by an \"insert\"\n  // * Just an \"insert\"\n  // * Just a \"delete\"\n  // We handle the three cases separately.\n  if (deletion && insertion) {\n    const oldWsPrefix = leadingWs(deletion.value);\n    const oldWsSuffix = trailingWs(deletion.value);\n    const newWsPrefix = leadingWs(insertion.value);\n    const newWsSuffix = trailingWs(insertion.value);\n\n    if (startKeep) {\n      const commonWsPrefix = longestCommonPrefix(oldWsPrefix, newWsPrefix);\n      startKeep.value = replaceSuffix(startKeep.value, newWsPrefix, commonWsPrefix);\n      deletion.value = removePrefix(deletion.value, commonWsPrefix);\n      insertion.value = removePrefix(insertion.value, commonWsPrefix);\n    }\n    if (endKeep) {\n      const commonWsSuffix = longestCommonSuffix(oldWsSuffix, newWsSuffix);\n      endKeep.value = replacePrefix(endKeep.value, newWsSuffix, commonWsSuffix);\n      deletion.value = removeSuffix(deletion.value, commonWsSuffix);\n      insertion.value = removeSuffix(insertion.value, commonWsSuffix);\n    }\n  } else if (insertion) {\n    // The whitespaces all reflect what was in the new text rather than\n    // the old, so we essentially have no information about whitespace\n    // insertion or deletion. We just want to dedupe the whitespace.\n    // We do that by having each change object keep its trailing\n    // whitespace and deleting duplicate leading whitespace where\n    // present.\n    if (startKeep) {\n      const ws = leadingWs(insertion.value);\n      insertion.value = insertion.value.substring(ws.length);\n    }\n    if (endKeep) {\n      const ws = leadingWs(endKeep.value);\n      endKeep.value = endKeep.value.substring(ws.length);\n    }\n  // otherwise we've got a deletion and no insertion\n  } else if (startKeep && endKeep) {\n    const newWsFull = leadingWs(endKeep.value),\n        delWsStart = leadingWs(deletion.value),\n        delWsEnd = trailingWs(deletion.value);\n\n    // Any whitespace that comes straight after startKeep in both the old and\n    // new texts, assign to startKeep and remove from the deletion.\n    const newWsStart = longestCommonPrefix(newWsFull, delWsStart);\n    deletion.value = removePrefix(deletion.value, newWsStart);\n\n    // Any whitespace that comes straight before endKeep in both the old and\n    // new texts, and hasn't already been assigned to startKeep, assign to\n    // endKeep and remove from the deletion.\n    const newWsEnd = longestCommonSuffix(\n      removePrefix(newWsFull, newWsStart),\n      delWsEnd\n    );\n    deletion.value = removeSuffix(deletion.value, newWsEnd);\n    endKeep.value = replacePrefix(endKeep.value, newWsFull, newWsEnd);\n\n    // If there's any whitespace from the new text that HASN'T already been\n    // assigned, assign it to the start:\n    startKeep.value = replaceSuffix(\n      startKeep.value,\n      newWsFull,\n      newWsFull.slice(0, newWsFull.length - newWsEnd.length)\n    );\n  } else if (endKeep) {\n    // We are at the start of the text. Preserve all the whitespace on\n    // endKeep, and just remove whitespace from the end of deletion to the\n    // extent that it overlaps with the start of endKeep.\n    const endKeepWsPrefix = leadingWs(endKeep.value);\n    const deletionWsSuffix = trailingWs(deletion.value);\n    const overlap = maximumOverlap(deletionWsSuffix, endKeepWsPrefix);\n    deletion.value = removeSuffix(deletion.value, overlap);\n  } else if (startKeep) {\n    // We are at the END of the text. Preserve all the whitespace on\n    // startKeep, and just remove whitespace from the start of deletion to\n    // the extent that it overlaps with the end of startKeep.\n    const startKeepWsSuffix = trailingWs(startKeep.value);\n    const deletionWsPrefix = leadingWs(deletion.value);\n    const overlap = maximumOverlap(startKeepWsSuffix, deletionWsPrefix);\n    deletion.value = removePrefix(deletion.value, overlap);\n  }\n}\n\n\nexport const wordWithSpaceDiff = new Diff();\nwordWithSpaceDiff.tokenize = function(value) {\n  // Slightly different to the tokenizeIncludingWhitespace regex used above in\n  // that this one treats each individual newline as a distinct tokens, rather\n  // than merging them into other surrounding whitespace. This was requested\n  // in https://github.com/kpdecker/jsdiff/issues/180 &\n  //    https://github.com/kpdecker/jsdiff/issues/211\n  const regex = new RegExp(`(\\\\r?\\\\n)|[${extendedWordChars}]+|[^\\\\S\\\\n\\\\r]+|[^${extendedWordChars}]`, 'ug');\n  return value.match(regex) || [];\n};\nexport function diffWordsWithSpace(oldStr, newStr, options) {\n  return wordWithSpaceDiff.diff(oldStr, newStr, 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