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| Viewing file: Select action/file-type: (function (global, factory) {
typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
typeof define === 'function' && define.amd ? define(['exports'], factory) :
(global = typeof globalThis !== 'undefined' ? globalThis : global || self, factory(global.Diff = {}));
})(this, (function (exports) { 'use strict';
class Diff {
diff(oldStr, newStr,
// Type below is not accurate/complete - see above for full possibilities - but it compiles
options = {}) {
let callback;
if (typeof options === 'function') {
callback = options;
options = {};
}
else if ('callback' in options) {
callback = options.callback;
}
// Allow subclasses to massage the input prior to running
const oldString = this.castInput(oldStr, options);
const newString = this.castInput(newStr, options);
const oldTokens = this.removeEmpty(this.tokenize(oldString, options));
const newTokens = this.removeEmpty(this.tokenize(newString, options));
return this.diffWithOptionsObj(oldTokens, newTokens, options, callback);
}
diffWithOptionsObj(oldTokens, newTokens, options, callback) {
var _a;
const done = (value) => {
value = this.postProcess(value, options);
if (callback) {
setTimeout(function () { callback(value); }, 0);
return undefined;
}
else {
return value;
}
};
const newLen = newTokens.length, oldLen = oldTokens.length;
let editLength = 1;
let maxEditLength = newLen + oldLen;
if (options.maxEditLength != null) {
maxEditLength = Math.min(maxEditLength, options.maxEditLength);
}
const maxExecutionTime = (_a = options.timeout) !== null && _a !== void 0 ? _a : Infinity;
const abortAfterTimestamp = Date.now() + maxExecutionTime;
const bestPath = [{ oldPos: -1, lastComponent: undefined }];
// Seed editLength = 0, i.e. the content starts with the same values
let newPos = this.extractCommon(bestPath[0], newTokens, oldTokens, 0, options);
if (bestPath[0].oldPos + 1 >= oldLen && newPos + 1 >= newLen) {
// Identity per the equality and tokenizer
return done(this.buildValues(bestPath[0].lastComponent, newTokens, oldTokens));
}
// Once we hit the right edge of the edit graph on some diagonal k, we can
// definitely reach the end of the edit graph in no more than k edits, so
// there's no point in considering any moves to diagonal k+1 any more (from
// which we're guaranteed to need at least k+1 more edits).
// Similarly, once we've reached the bottom of the edit graph, there's no
// point considering moves to lower diagonals.
// We record this fact by setting minDiagonalToConsider and
// maxDiagonalToConsider to some finite value once we've hit the edge of
// the edit graph.
// This optimization is not faithful to the original algorithm presented in
// Myers's paper, which instead pointlessly extends D-paths off the end of
// the edit graph - see page 7 of Myers's paper which notes this point
// explicitly and illustrates it with a diagram. This has major performance
// implications for some common scenarios. For instance, to compute a diff
// where the new text simply appends d characters on the end of the
// original text of length n, the true Myers algorithm will take O(n+d^2)
// time while this optimization needs only O(n+d) time.
let minDiagonalToConsider = -Infinity, maxDiagonalToConsider = Infinity;
// Main worker method. checks all permutations of a given edit length for acceptance.
const execEditLength = () => {
for (let diagonalPath = Math.max(minDiagonalToConsider, -editLength); diagonalPath <= Math.min(maxDiagonalToConsider, editLength); diagonalPath += 2) {
let basePath;
const removePath = bestPath[diagonalPath - 1], addPath = bestPath[diagonalPath + 1];
if (removePath) {
// No one else is going to attempt to use this value, clear it
// @ts-expect-error - perf optimisation. This type-violating value will never be read.
bestPath[diagonalPath - 1] = undefined;
}
let canAdd = false;
if (addPath) {
// what newPos will be after we do an insertion:
const addPathNewPos = addPath.oldPos - diagonalPath;
canAdd = addPath && 0 <= addPathNewPos && addPathNewPos < newLen;
}
const canRemove = removePath && removePath.oldPos + 1 < oldLen;
if (!canAdd && !canRemove) {
// If this path is a terminal then prune
// @ts-expect-error - perf optimisation. This type-violating value will never be read.
bestPath[diagonalPath] = undefined;
continue;
}
// Select the diagonal that we want to branch from. We select the prior
// path whose position in the old string is the farthest from the origin
// and does not pass the bounds of the diff graph
if (!canRemove || (canAdd && removePath.oldPos < addPath.oldPos)) {
basePath = this.addToPath(addPath, true, false, 0, options);
}
else {
basePath = this.addToPath(removePath, false, true, 1, options);
}
newPos = this.extractCommon(basePath, newTokens, oldTokens, diagonalPath, options);
if (basePath.oldPos + 1 >= oldLen && newPos + 1 >= newLen) {
// If we have hit the end of both strings, then we are done
return done(this.buildValues(basePath.lastComponent, newTokens, oldTokens)) || true;
}
else {
bestPath[diagonalPath] = basePath;
if (basePath.oldPos + 1 >= oldLen) {
maxDiagonalToConsider = Math.min(maxDiagonalToConsider, diagonalPath - 1);
}
if (newPos + 1 >= newLen) {
minDiagonalToConsider = Math.max(minDiagonalToConsider, diagonalPath + 1);
}
}
}
editLength++;
};
// Performs the length of edit iteration. Is a bit fugly as this has to support the
// sync and async mode which is never fun. Loops over execEditLength until a value
// is produced, or until the edit length exceeds options.maxEditLength (if given),
// in which case it will return undefined.
if (callback) {
(function exec() {
setTimeout(function () {
if (editLength > maxEditLength || Date.now() > abortAfterTimestamp) {
return callback(undefined);
}
if (!execEditLength()) {
exec();
}
}, 0);
}());
}
else {
while (editLength <= maxEditLength && Date.now() <= abortAfterTimestamp) {
const ret = execEditLength();
if (ret) {
return ret;
}
}
}
}
addToPath(path, added, removed, oldPosInc, options) {
const last = path.lastComponent;
if (last && !options.oneChangePerToken && last.added === added && last.removed === removed) {
return {
oldPos: path.oldPos + oldPosInc,
lastComponent: { count: last.count + 1, added: added, removed: removed, previousComponent: last.previousComponent }
};
}
else {
return {
oldPos: path.oldPos + oldPosInc,
lastComponent: { count: 1, added: added, removed: removed, previousComponent: last }
};
}
}
extractCommon(basePath, newTokens, oldTokens, diagonalPath, options) {
const newLen = newTokens.length, oldLen = oldTokens.length;
let oldPos = basePath.oldPos, newPos = oldPos - diagonalPath, commonCount = 0;
while (newPos + 1 < newLen && oldPos + 1 < oldLen && this.equals(oldTokens[oldPos + 1], newTokens[newPos + 1], options)) {
newPos++;
oldPos++;
commonCount++;
if (options.oneChangePerToken) {
basePath.lastComponent = { count: 1, previousComponent: basePath.lastComponent, added: false, removed: false };
}
}
if (commonCount && !options.oneChangePerToken) {
basePath.lastComponent = { count: commonCount, previousComponent: basePath.lastComponent, added: false, removed: false };
}
basePath.oldPos = oldPos;
return newPos;
}
equals(left, right, options) {
if (options.comparator) {
return options.comparator(left, right);
}
else {
return left === right
|| (!!options.ignoreCase && left.toLowerCase() === right.toLowerCase());
}
}
removeEmpty(array) {
const ret = [];
for (let i = 0; i < array.length; i++) {
if (array[i]) {
ret.push(array[i]);
}
}
return ret;
}
// eslint-disable-next-line @typescript-eslint/no-unused-vars
castInput(value, options) {
return value;
}
// eslint-disable-next-line @typescript-eslint/no-unused-vars
tokenize(value, options) {
return Array.from(value);
}
join(chars) {
// Assumes ValueT is string, which is the case for most subclasses.
// When it's false, e.g. in diffArrays, this method needs to be overridden (e.g. with a no-op)
// Yes, the casts are verbose and ugly, because this pattern - of having the base class SORT OF
// assume tokens and values are strings, but not completely - is weird and janky.
return chars.join('');
}
postProcess(changeObjects,
// eslint-disable-next-line @typescript-eslint/no-unused-vars
options) {
return changeObjects;
}
get useLongestToken() {
return false;
}
buildValues(lastComponent, newTokens, oldTokens) {
// First we convert our linked list of components in reverse order to an
// array in the right order:
const components = [];
let nextComponent;
while (lastComponent) {
components.push(lastComponent);
nextComponent = lastComponent.previousComponent;
delete lastComponent.previousComponent;
lastComponent = nextComponent;
}
components.reverse();
const componentLen = components.length;
let componentPos = 0, newPos = 0, oldPos = 0;
for (; componentPos < componentLen; componentPos++) {
const component = components[componentPos];
if (!component.removed) {
if (!component.added && this.useLongestToken) {
let value = newTokens.slice(newPos, newPos + component.count);
value = value.map(function (value, i) {
const oldValue = oldTokens[oldPos + i];
return oldValue.length > value.length ? oldValue : value;
});
component.value = this.join(value);
}
else {
component.value = this.join(newTokens.slice(newPos, newPos + component.count));
}
newPos += component.count;
// Common case
if (!component.added) {
oldPos += component.count;
}
}
else {
component.value = this.join(oldTokens.slice(oldPos, oldPos + component.count));
oldPos += component.count;
}
}
return components;
}
}
class CharacterDiff extends Diff {
}
const characterDiff = new CharacterDiff();
function diffChars(oldStr, newStr, options) {
return characterDiff.diff(oldStr, newStr, options);
}
function longestCommonPrefix(str1, str2) {
let i;
for (i = 0; i < str1.length && i < str2.length; i++) {
if (str1[i] != str2[i]) {
return str1.slice(0, i);
}
}
return str1.slice(0, i);
}
function longestCommonSuffix(str1, str2) {
let i;
// Unlike longestCommonPrefix, we need a special case to handle all scenarios
// where we return the empty string since str1.slice(-0) will return the
// entire string.
if (!str1 || !str2 || str1[str1.length - 1] != str2[str2.length - 1]) {
return '';
}
for (i = 0; i < str1.length && i < str2.length; i++) {
if (str1[str1.length - (i + 1)] != str2[str2.length - (i + 1)]) {
return str1.slice(-i);
}
}
return str1.slice(-i);
}
function replacePrefix(string, oldPrefix, newPrefix) {
if (string.slice(0, oldPrefix.length) != oldPrefix) {
throw Error(`string ${JSON.stringify(string)} doesn't start with prefix ${JSON.stringify(oldPrefix)}; this is a bug`);
}
return newPrefix + string.slice(oldPrefix.length);
}
function replaceSuffix(string, oldSuffix, newSuffix) {
if (!oldSuffix) {
return string + newSuffix;
}
if (string.slice(-oldSuffix.length) != oldSuffix) {
throw Error(`string ${JSON.stringify(string)} doesn't end with suffix ${JSON.stringify(oldSuffix)}; this is a bug`);
}
return string.slice(0, -oldSuffix.length) + newSuffix;
}
function removePrefix(string, oldPrefix) {
return replacePrefix(string, oldPrefix, '');
}
function removeSuffix(string, oldSuffix) {
return replaceSuffix(string, oldSuffix, '');
}
function maximumOverlap(string1, string2) {
return string2.slice(0, overlapCount(string1, string2));
}
// Nicked from https://stackoverflow.com/a/60422853/1709587
function overlapCount(a, b) {
// Deal with cases where the strings differ in length
let startA = 0;
if (a.length > b.length) {
startA = a.length - b.length;
}
let endB = b.length;
if (a.length < b.length) {
endB = a.length;
}
// Create a back-reference for each index
// that should be followed in case of a mismatch.
// We only need B to make these references:
const map = Array(endB);
let k = 0; // Index that lags behind j
map[0] = 0;
for (let j = 1; j < endB; j++) {
if (b[j] == b[k]) {
map[j] = map[k]; // skip over the same character (optional optimisation)
}
else {
map[j] = k;
}
while (k > 0 && b[j] != b[k]) {
k = map[k];
}
if (b[j] == b[k]) {
k++;
}
}
// Phase 2: use these references while iterating over A
k = 0;
for (let i = startA; i < a.length; i++) {
while (k > 0 && a[i] != b[k]) {
k = map[k];
}
if (a[i] == b[k]) {
k++;
}
}
return k;
}
/**
* Returns true if the string consistently uses Windows line endings.
*/
function hasOnlyWinLineEndings(string) {
return string.includes('\r\n') && !string.startsWith('\n') && !string.match(/[^\r]\n/);
}
/**
* Returns true if the string consistently uses Unix line endings.
*/
function hasOnlyUnixLineEndings(string) {
return !string.includes('\r\n') && string.includes('\n');
}
function trailingWs(string) {
// Yes, this looks overcomplicated and dumb - why not replace the whole function with
// return string match(/\s*$/)[0]
// you ask? Because:
// 1. the trap described at https://markamery.com/blog/quadratic-time-regexes/ would mean doing
// this would cause this function to take O(n²) time in the worst case (specifically when
// there is a massive run of NON-TRAILING whitespace in `string`), and
// 2. the fix proposed in the same blog post, of using a negative lookbehind, is incompatible
// with old Safari versions that we'd like to not break if possible (see
// https://github.com/kpdecker/jsdiff/pull/550)
// It feels absurd to do this with an explicit loop instead of a regex, but I really can't see a
// better way that doesn't result in broken behaviour.
let i;
for (i = string.length - 1; i >= 0; i--) {
if (!string[i].match(/\s/)) {
break;
}
}
return string.substring(i + 1);
}
function leadingWs(string) {
// Thankfully the annoying considerations described in trailingWs don't apply here:
const match = string.match(/^\s*/);
return match ? match[0] : '';
}
// 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
const 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.
const tokenizeIncludingWhitespace = new RegExp(`[${extendedWordChars}]+|\\s+|[^${extendedWordChars}]`, 'ug');
class WordDiff extends Diff {
equals(left, right, options) {
if (options.ignoreCase) {
left = left.toLowerCase();
right = right.toLowerCase();
}
return left.trim() === right.trim();
}
tokenize(value, options = {}) {
let parts;
if (options.intlSegmenter) {
const segmenter = options.intlSegmenter;
if (segmenter.resolvedOptions().granularity != 'word') {
throw new Error('The segmenter passed must have a granularity of "word"');
}
parts = Array.from(segmenter.segment(value), segment => segment.segment);
}
else {
parts = value.match(tokenizeIncludingWhitespace) || [];
}
const tokens = [];
let prevPart = null;
parts.forEach(part => {
if ((/\s/).test(part)) {
if (prevPart == null) {
tokens.push(part);
}
else {
tokens.push(tokens.pop() + part);
}
}
else if (prevPart != null && (/\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;
}
join(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((token, i) => {
if (i == 0) {
return token;
}
else {
return token.replace((/^\s+/), '');
}
}).join('');
}
postProcess(changes, options) {
if (!changes || options.oneChangePerToken) {
return changes;
}
let lastKeep = null;
// Change objects representing any insertion or deletion since the last
// "keep" change object. There can be at most one of each.
let insertion = null;
let deletion = null;
changes.forEach(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;
}
}
const wordDiff = new WordDiff();
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) {
const oldWsPrefix = leadingWs(deletion.value);
const oldWsSuffix = trailingWs(deletion.value);
const newWsPrefix = leadingWs(insertion.value);
const newWsSuffix = trailingWs(insertion.value);
if (startKeep) {
const commonWsPrefix = longestCommonPrefix(oldWsPrefix, newWsPrefix);
startKeep.value = replaceSuffix(startKeep.value, newWsPrefix, commonWsPrefix);
deletion.value = removePrefix(deletion.value, commonWsPrefix);
insertion.value = removePrefix(insertion.value, commonWsPrefix);
}
if (endKeep) {
const commonWsSuffix = longestCommonSuffix(oldWsSuffix, newWsSuffix);
endKeep.value = replacePrefix(endKeep.value, newWsSuffix, commonWsSuffix);
deletion.value = removeSuffix(deletion.value, commonWsSuffix);
insertion.value = 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) {
const ws = leadingWs(insertion.value);
insertion.value = insertion.value.substring(ws.length);
}
if (endKeep) {
const ws = leadingWs(endKeep.value);
endKeep.value = endKeep.value.substring(ws.length);
}
// otherwise we've got a deletion and no insertion
}
else if (startKeep && endKeep) {
const newWsFull = leadingWs(endKeep.value), delWsStart = leadingWs(deletion.value), delWsEnd = 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.
const newWsStart = longestCommonPrefix(newWsFull, delWsStart);
deletion.value = 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.
const newWsEnd = longestCommonSuffix(removePrefix(newWsFull, newWsStart), delWsEnd);
deletion.value = removeSuffix(deletion.value, newWsEnd);
endKeep.value = 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 = 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.
const endKeepWsPrefix = leadingWs(endKeep.value);
const deletionWsSuffix = trailingWs(deletion.value);
const overlap = maximumOverlap(deletionWsSuffix, endKeepWsPrefix);
deletion.value = 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.
const startKeepWsSuffix = trailingWs(startKeep.value);
const deletionWsPrefix = leadingWs(deletion.value);
const overlap = maximumOverlap(startKeepWsSuffix, deletionWsPrefix);
deletion.value = removePrefix(deletion.value, overlap);
}
}
class WordsWithSpaceDiff extends Diff {
tokenize(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
const regex = new RegExp(`(\\r?\\n)|[${extendedWordChars}]+|[^\\S\\n\\r]+|[^${extendedWordChars}]`, 'ug');
return value.match(regex) || [];
}
}
const wordsWithSpaceDiff = new WordsWithSpaceDiff();
function diffWordsWithSpace(oldStr, newStr, options) {
return wordsWithSpaceDiff.diff(oldStr, newStr, options);
}
function generateOptions(options, defaults) {
if (typeof options === 'function') {
defaults.callback = options;
}
else if (options) {
for (const name in options) {
/* istanbul ignore else */
if (Object.prototype.hasOwnProperty.call(options, name)) {
defaults[name] = options[name];
}
}
}
return defaults;
}
class LineDiff extends Diff {
constructor() {
super(...arguments);
this.tokenize = tokenize;
}
equals(left, right, options) {
// If we're ignoring whitespace, we need to normalise lines by stripping
// whitespace before checking equality. (This has an annoying interaction
// with newlineIsToken that requires special handling: if newlines get their
// own token, then we DON'T want to trim the *newline* tokens down to empty
// strings, since this would cause us to treat whitespace-only line content
// as equal to a separator between lines, which would be weird and
// inconsistent with the documented behavior of the options.)
if (options.ignoreWhitespace) {
if (!options.newlineIsToken || !left.includes('\n')) {
left = left.trim();
}
if (!options.newlineIsToken || !right.includes('\n')) {
right = right.trim();
}
}
else if (options.ignoreNewlineAtEof && !options.newlineIsToken) {
if (left.endsWith('\n')) {
left = left.slice(0, -1);
}
if (right.endsWith('\n')) {
right = right.slice(0, -1);
}
}
return super.equals(left, right, options);
}
}
const lineDiff = new LineDiff();
function diffLines(oldStr, newStr, options) {
return lineDiff.diff(oldStr, newStr, options);
}
function diffTrimmedLines(oldStr, newStr, options) {
options = generateOptions(options, { ignoreWhitespace: true });
return lineDiff.diff(oldStr, newStr, options);
}
// Exported standalone so it can be used from jsonDiff too.
function tokenize(value, options) {
if (options.stripTrailingCr) {
// remove one \r before \n to match GNU diff's --strip-trailing-cr behavior
value = value.replace(/\r\n/g, '\n');
}
const retLines = [], linesAndNewlines = value.split(/(\n|\r\n)/);
// Ignore the final empty token that occurs if the string ends with a new line
if (!linesAndNewlines[linesAndNewlines.length - 1]) {
linesAndNewlines.pop();
}
// Merge the content and line separators into single tokens
for (let i = 0; i < linesAndNewlines.length; i++) {
const line = linesAndNewlines[i];
if (i % 2 && !options.newlineIsToken) {
retLines[retLines.length - 1] += line;
}
else {
retLines.push(line);
}
}
return retLines;
}
function isSentenceEndPunct(char) {
return char == '.' || char == '!' || char == '?';
}
class SentenceDiff extends Diff {
tokenize(value) {
var _a;
// If in future we drop support for environments that don't support lookbehinds, we can replace
// this entire function with:
// return value.split(/(?<=[.!?])(\s+|$)/);
// but until then, for similar reasons to the trailingWs function in string.ts, we are forced
// to do this verbosely "by hand" instead of using a regex.
const result = [];
let tokenStartI = 0;
for (let i = 0; i < value.length; i++) {
if (i == value.length - 1) {
result.push(value.slice(tokenStartI));
break;
}
if (isSentenceEndPunct(value[i]) && value[i + 1].match(/\s/)) {
// We've hit a sentence break - i.e. a punctuation mark followed by whitespace.
// We now want to push TWO tokens to the result:
// 1. the sentence
result.push(value.slice(tokenStartI, i + 1));
// 2. the whitespace
i = tokenStartI = i + 1;
while ((_a = value[i + 1]) === null || _a === void 0 ? void 0 : _a.match(/\s/)) {
i++;
}
result.push(value.slice(tokenStartI, i + 1));
// Then the next token (a sentence) starts on the character after the whitespace.
// (It's okay if this is off the end of the string - then the outer loop will terminate
// here anyway.)
tokenStartI = i + 1;
}
}
return result;
}
}
const sentenceDiff = new SentenceDiff();
function diffSentences(oldStr, newStr, options) {
return sentenceDiff.diff(oldStr, newStr, options);
}
class CssDiff extends Diff {
tokenize(value) {
return value.split(/([{}:;,]|\s+)/);
}
}
const cssDiff = new CssDiff();
function diffCss(oldStr, newStr, options) {
return cssDiff.diff(oldStr, newStr, options);
}
class JsonDiff extends Diff {
constructor() {
super(...arguments);
this.tokenize = tokenize;
}
get useLongestToken() {
// Discriminate between two lines of pretty-printed, serialized JSON where one of them has a
// dangling comma and the other doesn't. Turns out including the dangling comma yields the nicest output:
return true;
}
castInput(value, options) {
const { undefinedReplacement, stringifyReplacer = (k, v) => typeof v === 'undefined' ? undefinedReplacement : v } = options;
return typeof value === 'string' ? value : JSON.stringify(canonicalize(value, null, null, stringifyReplacer), null, ' ');
}
equals(left, right, options) {
return super.equals(left.replace(/,([\r\n])/g, '$1'), right.replace(/,([\r\n])/g, '$1'), options);
}
}
const jsonDiff = new JsonDiff();
function diffJson(oldStr, newStr, options) {
return jsonDiff.diff(oldStr, newStr, options);
}
// This function handles the presence of circular references by bailing out when encountering an
// object that is already on the "stack" of items being processed. Accepts an optional replacer
function canonicalize(obj, stack, replacementStack, replacer, key) {
stack = stack || [];
replacementStack = replacementStack || [];
if (replacer) {
obj = replacer(key === undefined ? '' : key, obj);
}
let i;
for (i = 0; i < stack.length; i += 1) {
if (stack[i] === obj) {
return replacementStack[i];
}
}
let canonicalizedObj;
if ('[object Array]' === Object.prototype.toString.call(obj)) {
stack.push(obj);
canonicalizedObj = new Array(obj.length);
replacementStack.push(canonicalizedObj);
for (i = 0; i < obj.length; i += 1) {
canonicalizedObj[i] = canonicalize(obj[i], stack, replacementStack, replacer, String(i));
}
stack.pop();
replacementStack.pop();
return canonicalizedObj;
}
if (obj && obj.toJSON) {
obj = obj.toJSON();
}
if (typeof obj === 'object' && obj !== null) {
stack.push(obj);
canonicalizedObj = {};
replacementStack.push(canonicalizedObj);
const sortedKeys = [];
let key;
for (key in obj) {
/* istanbul ignore else */
if (Object.prototype.hasOwnProperty.call(obj, key)) {
sortedKeys.push(key);
}
}
sortedKeys.sort();
for (i = 0; i < sortedKeys.length; i += 1) {
key = sortedKeys[i];
canonicalizedObj[key] = canonicalize(obj[key], stack, replacementStack, replacer, key);
}
stack.pop();
replacementStack.pop();
}
else {
canonicalizedObj = obj;
}
return canonicalizedObj;
}
class ArrayDiff extends Diff {
tokenize(value) {
return value.slice();
}
join(value) {
return value;
}
removeEmpty(value) {
return value;
}
}
const arrayDiff = new ArrayDiff();
function diffArrays(oldArr, newArr, options) {
return arrayDiff.diff(oldArr, newArr, options);
}
function unixToWin(patch) {
if (Array.isArray(patch)) {
// It would be cleaner if instead of the line below we could just write
// return patch.map(unixToWin)
// but mysteriously TypeScript (v5.7.3 at the time of writing) does not like this and it will
// refuse to compile, thinking that unixToWin could then return StructuredPatch[][] and the
// result would be incompatible with the overload signatures.
// See bug report at https://github.com/microsoft/TypeScript/issues/61398.
return patch.map(p => unixToWin(p));
}
return Object.assign(Object.assign({}, patch), { hunks: patch.hunks.map(hunk => (Object.assign(Object.assign({}, hunk), { lines: hunk.lines.map((line, i) => {
var _a;
return (line.startsWith('\\') || line.endsWith('\r') || ((_a = hunk.lines[i + 1]) === null || _a === void 0 ? void 0 : _a.startsWith('\\')))
? line
: line + '\r';
}) }))) });
}
function winToUnix(patch) {
if (Array.isArray(patch)) {
// (See comment above equivalent line in unixToWin)
return patch.map(p => winToUnix(p));
}
return Object.assign(Object.assign({}, patch), { hunks: patch.hunks.map(hunk => (Object.assign(Object.assign({}, hunk), { lines: hunk.lines.map(line => line.endsWith('\r') ? line.substring(0, line.length - 1) : line) }))) });
}
/**
* Returns true if the patch consistently uses Unix line endings (or only involves one line and has
* no line endings).
*/
function isUnix(patch) {
if (!Array.isArray(patch)) {
patch = [patch];
}
return !patch.some(index => index.hunks.some(hunk => hunk.lines.some(line => !line.startsWith('\\') && line.endsWith('\r'))));
}
/**
* Returns true if the patch uses Windows line endings and only Windows line endings.
*/
function isWin(patch) {
if (!Array.isArray(patch)) {
patch = [patch];
}
return patch.some(index => index.hunks.some(hunk => hunk.lines.some(line => line.endsWith('\r'))))
&& patch.every(index => index.hunks.every(hunk => hunk.lines.every((line, i) => { var _a; return line.startsWith('\\') || line.endsWith('\r') || ((_a = hunk.lines[i + 1]) === null || _a === void 0 ? void 0 : _a.startsWith('\\')); })));
}
/**
* Parses a patch into structured data, in the same structure returned by `structuredPatch`.
*
* @return a JSON object representation of the a patch, suitable for use with the `applyPatch` method.
*/
function parsePatch(uniDiff) {
const diffstr = uniDiff.split(/\n/), list = [];
let i = 0;
function parseIndex() {
const index = {};
list.push(index);
// Parse diff metadata
while (i < diffstr.length) {
const line = diffstr[i];
// File header found, end parsing diff metadata
if ((/^(---|\+\+\+|@@)\s/).test(line)) {
break;
}
// Diff index
const header = (/^(?:Index:|diff(?: -r \w+)+)\s+(.+?)\s*$/).exec(line);
if (header) {
index.index = header[1];
}
i++;
}
// Parse file headers if they are defined. Unified diff requires them, but
// there's no technical issues to have an isolated hunk without file header
parseFileHeader(index);
parseFileHeader(index);
// Parse hunks
index.hunks = [];
while (i < diffstr.length) {
const line = diffstr[i];
if ((/^(Index:\s|diff\s|---\s|\+\+\+\s|===================================================================)/).test(line)) {
break;
}
else if ((/^@@/).test(line)) {
index.hunks.push(parseHunk());
}
else if (line) {
throw new Error('Unknown line ' + (i + 1) + ' ' + JSON.stringify(line));
}
else {
i++;
}
}
}
// Parses the --- and +++ headers, if none are found, no lines
// are consumed.
function parseFileHeader(index) {
const fileHeader = (/^(---|\+\+\+)\s+(.*)\r?$/).exec(diffstr[i]);
if (fileHeader) {
const data = fileHeader[2].split('\t', 2), header = (data[1] || '').trim();
let fileName = data[0].replace(/\\\\/g, '\\');
if ((/^".*"$/).test(fileName)) {
fileName = fileName.substr(1, fileName.length - 2);
}
if (fileHeader[1] === '---') {
index.oldFileName = fileName;
index.oldHeader = header;
}
else {
index.newFileName = fileName;
index.newHeader = header;
}
i++;
}
}
// Parses a hunk
// This assumes that we are at the start of a hunk.
function parseHunk() {
var _a;
const chunkHeaderIndex = i, chunkHeaderLine = diffstr[i++], chunkHeader = chunkHeaderLine.split(/@@ -(\d+)(?:,(\d+))? \+(\d+)(?:,(\d+))? @@/);
const hunk = {
oldStart: +chunkHeader[1],
oldLines: typeof chunkHeader[2] === 'undefined' ? 1 : +chunkHeader[2],
newStart: +chunkHeader[3],
newLines: typeof chunkHeader[4] === 'undefined' ? 1 : +chunkHeader[4],
lines: []
};
// Unified Diff Format quirk: If the chunk size is 0,
// the first number is one lower than one would expect.
// https://www.artima.com/weblogs/viewpost.jsp?thread=164293
if (hunk.oldLines === 0) {
hunk.oldStart += 1;
}
if (hunk.newLines === 0) {
hunk.newStart += 1;
}
let addCount = 0, removeCount = 0;
for (; i < diffstr.length && (removeCount < hunk.oldLines || addCount < hunk.newLines || ((_a = diffstr[i]) === null || _a === void 0 ? void 0 : _a.startsWith('\\'))); i++) {
const operation = (diffstr[i].length == 0 && i != (diffstr.length - 1)) ? ' ' : diffstr[i][0];
if (operation === '+' || operation === '-' || operation === ' ' || operation === '\\') {
hunk.lines.push(diffstr[i]);
if (operation === '+') {
addCount++;
}
else if (operation === '-') {
removeCount++;
}
else if (operation === ' ') {
addCount++;
removeCount++;
}
}
else {
throw new Error(`Hunk at line ${chunkHeaderIndex + 1} contained invalid line ${diffstr[i]}`);
}
}
// Handle the empty block count case
if (!addCount && hunk.newLines === 1) {
hunk.newLines = 0;
}
if (!removeCount && hunk.oldLines === 1) {
hunk.oldLines = 0;
}
// Perform sanity checking
if (addCount !== hunk.newLines) {
throw new Error('Added line count did not match for hunk at line ' + (chunkHeaderIndex + 1));
}
if (removeCount !== hunk.oldLines) {
throw new Error('Removed line count did not match for hunk at line ' + (chunkHeaderIndex + 1));
}
return hunk;
}
while (i < diffstr.length) {
parseIndex();
}
return list;
}
// Iterator that traverses in the range of [min, max], stepping
// by distance from a given start position. I.e. for [0, 4], with
// start of 2, this will iterate 2, 3, 1, 4, 0.
function distanceIterator (start, minLine, maxLine) {
let wantForward = true, backwardExhausted = false, forwardExhausted = false, localOffset = 1;
return function iterator() {
if (wantForward && !forwardExhausted) {
if (backwardExhausted) {
localOffset++;
}
else {
wantForward = false;
}
// Check if trying to fit beyond text length, and if not, check it fits
// after offset location (or desired location on first iteration)
if (start + localOffset <= maxLine) {
return start + localOffset;
}
forwardExhausted = true;
}
if (!backwardExhausted) {
if (!forwardExhausted) {
wantForward = true;
}
// Check if trying to fit before text beginning, and if not, check it fits
// before offset location
if (minLine <= start - localOffset) {
return start - localOffset++;
}
backwardExhausted = true;
return iterator();
}
// We tried to fit hunk before text beginning and beyond text length, then
// hunk can't fit on the text. Return undefined
return undefined;
};
}
/**
* attempts to apply a unified diff patch.
*
* Hunks are applied first to last.
* `applyPatch` first tries to apply the first hunk at the line number specified in the hunk header, and with all context lines matching exactly.
* If that fails, it tries scanning backwards and forwards, one line at a time, to find a place to apply the hunk where the context lines match exactly.
* If that still fails, and `fuzzFactor` is greater than zero, it increments the maximum number of mismatches (missing, extra, or changed context lines) that there can be between the hunk context and a region where we are trying to apply the patch such that the hunk will still be considered to match.
* Regardless of `fuzzFactor`, lines to be deleted in the hunk *must* be present for a hunk to match, and the context lines *immediately* before and after an insertion must match exactly.
*
* Once a hunk is successfully fitted, the process begins again with the next hunk.
* Regardless of `fuzzFactor`, later hunks must be applied later in the file than earlier hunks.
*
* If a hunk cannot be successfully fitted *anywhere* with fewer than `fuzzFactor` mismatches, `applyPatch` fails and returns `false`.
*
* If a hunk is successfully fitted but not at the line number specified by the hunk header, all subsequent hunks have their target line number adjusted accordingly.
* (e.g. if the first hunk is applied 10 lines below where the hunk header said it should fit, `applyPatch` will *start* looking for somewhere to apply the second hunk 10 lines below where its hunk header says it goes.)
*
* If the patch was applied successfully, returns a string containing the patched text.
* If the patch could not be applied (because some hunks in the patch couldn't be fitted to the text in `source`), `applyPatch` returns false.
*
* @param patch a string diff or the output from the `parsePatch` or `structuredPatch` methods.
*/
function applyPatch(source, patch, options = {}) {
let patches;
if (typeof patch === 'string') {
patches = parsePatch(patch);
}
else if (Array.isArray(patch)) {
patches = patch;
}
else {
patches = [patch];
}
if (patches.length > 1) {
throw new Error('applyPatch only works with a single input.');
}
return applyStructuredPatch(source, patches[0], options);
}
function applyStructuredPatch(source, patch, options = {}) {
if (options.autoConvertLineEndings || options.autoConvertLineEndings == null) {
if (hasOnlyWinLineEndings(source) && isUnix(patch)) {
patch = unixToWin(patch);
}
else if (hasOnlyUnixLineEndings(source) && isWin(patch)) {
patch = winToUnix(patch);
}
}
// Apply the diff to the input
const lines = source.split('\n'), hunks = patch.hunks, compareLine = options.compareLine || ((lineNumber, line, operation, patchContent) => line === patchContent), fuzzFactor = options.fuzzFactor || 0;
let minLine = 0;
if (fuzzFactor < 0 || !Number.isInteger(fuzzFactor)) {
throw new Error('fuzzFactor must be a non-negative integer');
}
// Special case for empty patch.
if (!hunks.length) {
return source;
}
// Before anything else, handle EOFNL insertion/removal. If the patch tells us to make a change
// to the EOFNL that is redundant/impossible - i.e. to remove a newline that's not there, or add a
// newline that already exists - then we either return false and fail to apply the patch (if
// fuzzFactor is 0) or simply ignore the problem and do nothing (if fuzzFactor is >0).
// If we do need to remove/add a newline at EOF, this will always be in the final hunk:
let prevLine = '', removeEOFNL = false, addEOFNL = false;
for (let i = 0; i < hunks[hunks.length - 1].lines.length; i++) {
const line = hunks[hunks.length - 1].lines[i];
if (line[0] == '\\') {
if (prevLine[0] == '+') {
removeEOFNL = true;
}
else if (prevLine[0] == '-') {
addEOFNL = true;
}
}
prevLine = line;
}
if (removeEOFNL) {
if (addEOFNL) {
// This means the final line gets changed but doesn't have a trailing newline in either the
// original or patched version. In that case, we do nothing if fuzzFactor > 0, and if
// fuzzFactor is 0, we simply validate that the source file has no trailing newline.
if (!fuzzFactor && lines[lines.length - 1] == '') {
return false;
}
}
else if (lines[lines.length - 1] == '') {
lines.pop();
}
else if (!fuzzFactor) {
return false;
}
}
else if (addEOFNL) {
if (lines[lines.length - 1] != '') {
lines.push('');
}
else if (!fuzzFactor) {
return false;
}
}
/**
* Checks if the hunk can be made to fit at the provided location with at most `maxErrors`
* insertions, substitutions, or deletions, while ensuring also that:
* - lines deleted in the hunk match exactly, and
* - wherever an insertion operation or block of insertion operations appears in the hunk, the
* immediately preceding and following lines of context match exactly
*
* `toPos` should be set such that lines[toPos] is meant to match hunkLines[0].
*
* If the hunk can be applied, returns an object with properties `oldLineLastI` and
* `replacementLines`. Otherwise, returns null.
*/
function applyHunk(hunkLines, toPos, maxErrors, hunkLinesI = 0, lastContextLineMatched = true, patchedLines = [], patchedLinesLength = 0) {
let nConsecutiveOldContextLines = 0;
let nextContextLineMustMatch = false;
for (; hunkLinesI < hunkLines.length; hunkLinesI++) {
const hunkLine = hunkLines[hunkLinesI], operation = (hunkLine.length > 0 ? hunkLine[0] : ' '), content = (hunkLine.length > 0 ? hunkLine.substr(1) : hunkLine);
if (operation === '-') {
if (compareLine(toPos + 1, lines[toPos], operation, content)) {
toPos++;
nConsecutiveOldContextLines = 0;
}
else {
if (!maxErrors || lines[toPos] == null) {
return null;
}
patchedLines[patchedLinesLength] = lines[toPos];
return applyHunk(hunkLines, toPos + 1, maxErrors - 1, hunkLinesI, false, patchedLines, patchedLinesLength + 1);
}
}
if (operation === '+') {
if (!lastContextLineMatched) {
return null;
}
patchedLines[patchedLinesLength] = content;
patchedLinesLength++;
nConsecutiveOldContextLines = 0;
nextContextLineMustMatch = true;
}
if (operation === ' ') {
nConsecutiveOldContextLines++;
patchedLines[patchedLinesLength] = lines[toPos];
if (compareLine(toPos + 1, lines[toPos], operation, content)) {
patchedLinesLength++;
lastContextLineMatched = true;
nextContextLineMustMatch = false;
toPos++;
}
else {
if (nextContextLineMustMatch || !maxErrors) {
return null;
}
// Consider 3 possibilities in sequence:
// 1. lines contains a *substitution* not included in the patch context, or
// 2. lines contains an *insertion* not included in the patch context, or
// 3. lines contains a *deletion* not included in the patch context
// The first two options are of course only possible if the line from lines is non-null -
// i.e. only option 3 is possible if we've overrun the end of the old file.
return (lines[toPos] && (applyHunk(hunkLines, toPos + 1, maxErrors - 1, hunkLinesI + 1, false, patchedLines, patchedLinesLength + 1) || applyHunk(hunkLines, toPos + 1, maxErrors - 1, hunkLinesI, false, patchedLines, patchedLinesLength + 1)) || applyHunk(hunkLines, toPos, maxErrors - 1, hunkLinesI + 1, false, patchedLines, patchedLinesLength));
}
}
}
// Before returning, trim any unmodified context lines off the end of patchedLines and reduce
// toPos (and thus oldLineLastI) accordingly. This allows later hunks to be applied to a region
// that starts in this hunk's trailing context.
patchedLinesLength -= nConsecutiveOldContextLines;
toPos -= nConsecutiveOldContextLines;
patchedLines.length = patchedLinesLength;
return {
patchedLines,
oldLineLastI: toPos - 1
};
}
const resultLines = [];
// Search best fit offsets for each hunk based on the previous ones
let prevHunkOffset = 0;
for (let i = 0; i < hunks.length; i++) {
const hunk = hunks[i];
let hunkResult;
const maxLine = lines.length - hunk.oldLines + fuzzFactor;
let toPos;
for (let maxErrors = 0; maxErrors <= fuzzFactor; maxErrors++) {
toPos = hunk.oldStart + prevHunkOffset - 1;
const iterator = distanceIterator(toPos, minLine, maxLine);
for (; toPos !== undefined; toPos = iterator()) {
hunkResult = applyHunk(hunk.lines, toPos, maxErrors);
if (hunkResult) {
break;
}
}
if (hunkResult) {
break;
}
}
if (!hunkResult) {
return false;
}
// Copy everything from the end of where we applied the last hunk to the start of this hunk
for (let i = minLine; i < toPos; i++) {
resultLines.push(lines[i]);
}
// Add the lines produced by applying the hunk:
for (let i = 0; i < hunkResult.patchedLines.length; i++) {
const line = hunkResult.patchedLines[i];
resultLines.push(line);
}
// Set lower text limit to end of the current hunk, so next ones don't try
// to fit over already patched text
minLine = hunkResult.oldLineLastI + 1;
// Note the offset between where the patch said the hunk should've applied and where we
// applied it, so we can adjust future hunks accordingly:
prevHunkOffset = toPos + 1 - hunk.oldStart;
}
// Copy over the rest of the lines from the old text
for (let i = minLine; i < lines.length; i++) {
resultLines.push(lines[i]);
}
return resultLines.join('\n');
}
/**
* applies one or more patches.
*
* `patch` may be either an array of structured patch objects, or a string representing a patch in unified diff format (which may patch one or more files).
*
* This method will iterate over the contents of the patch and apply to data provided through callbacks. The general flow for each patch index is:
*
* - `options.loadFile(index, callback)` is called. The caller should then load the contents of the file and then pass that to the `callback(err, data)` callback. Passing an `err` will terminate further patch execution.
* - `options.patched(index, content, callback)` is called once the patch has been applied. `content` will be the return value from `applyPatch`. When it's ready, the caller should call `callback(err)` callback. Passing an `err` will terminate further patch execution.
*
* Once all patches have been applied or an error occurs, the `options.complete(err)` callback is made.
*/
function applyPatches(uniDiff, options) {
const spDiff = typeof uniDiff === 'string' ? parsePatch(uniDiff) : uniDiff;
let currentIndex = 0;
function processIndex() {
const index = spDiff[currentIndex++];
if (!index) {
return options.complete();
}
options.loadFile(index, function (err, data) {
if (err) {
return options.complete(err);
}
const updatedContent = applyPatch(data, index, options);
options.patched(index, updatedContent, function (err) {
if (err) {
return options.complete(err);
}
processIndex();
});
});
}
processIndex();
}
function reversePatch(structuredPatch) {
if (Array.isArray(structuredPatch)) {
// (See comment in unixToWin for why we need the pointless-looking anonymous function here)
return structuredPatch.map(patch => reversePatch(patch)).reverse();
}
return Object.assign(Object.assign({}, structuredPatch), { oldFileName: structuredPatch.newFileName, oldHeader: structuredPatch.newHeader, newFileName: structuredPatch.oldFileName, newHeader: structuredPatch.oldHeader, hunks: structuredPatch.hunks.map(hunk => {
return {
oldLines: hunk.newLines,
oldStart: hunk.newStart,
newLines: hunk.oldLines,
newStart: hunk.oldStart,
lines: hunk.lines.map(l => {
if (l.startsWith('-')) {
return `+${l.slice(1)}`;
}
if (l.startsWith('+')) {
return `-${l.slice(1)}`;
}
return l;
})
};
}) });
}
function structuredPatch(oldFileName, newFileName, oldStr, newStr, oldHeader, newHeader, options) {
let optionsObj;
if (!options) {
optionsObj = {};
}
else if (typeof options === 'function') {
optionsObj = { callback: options };
}
else {
optionsObj = options;
}
if (typeof optionsObj.context === 'undefined') {
optionsObj.context = 4;
}
// We copy this into its own variable to placate TypeScript, which thinks
// optionsObj.context might be undefined in the callbacks below.
const context = optionsObj.context;
// @ts-expect-error (runtime check for something that is correctly a static type error)
if (optionsObj.newlineIsToken) {
throw new Error('newlineIsToken may not be used with patch-generation functions, only with diffing functions');
}
if (!optionsObj.callback) {
return diffLinesResultToPatch(diffLines(oldStr, newStr, optionsObj));
}
else {
const { callback } = optionsObj;
diffLines(oldStr, newStr, Object.assign(Object.assign({}, optionsObj), { callback: (diff) => {
const patch = diffLinesResultToPatch(diff);
// TypeScript is unhappy without the cast because it does not understand that `patch` may
// be undefined here only if `callback` is StructuredPatchCallbackAbortable:
callback(patch);
} }));
}
function diffLinesResultToPatch(diff) {
// STEP 1: Build up the patch with no "\ No newline at end of file" lines and with the arrays
// of lines containing trailing newline characters. We'll tidy up later...
if (!diff) {
return;
}
diff.push({ value: '', lines: [] }); // Append an empty value to make cleanup easier
function contextLines(lines) {
return lines.map(function (entry) { return ' ' + entry; });
}
const hunks = [];
let oldRangeStart = 0, newRangeStart = 0, curRange = [], oldLine = 1, newLine = 1;
for (let i = 0; i < diff.length; i++) {
const current = diff[i], lines = current.lines || splitLines(current.value);
current.lines = lines;
if (current.added || current.removed) {
// If we have previous context, start with that
if (!oldRangeStart) {
const prev = diff[i - 1];
oldRangeStart = oldLine;
newRangeStart = newLine;
if (prev) {
curRange = context > 0 ? contextLines(prev.lines.slice(-context)) : [];
oldRangeStart -= curRange.length;
newRangeStart -= curRange.length;
}
}
// Output our changes
for (const line of lines) {
curRange.push((current.added ? '+' : '-') + line);
}
// Track the updated file position
if (current.added) {
newLine += lines.length;
}
else {
oldLine += lines.length;
}
}
else {
// Identical context lines. Track line changes
if (oldRangeStart) {
// Close out any changes that have been output (or join overlapping)
if (lines.length <= context * 2 && i < diff.length - 2) {
// Overlapping
for (const line of contextLines(lines)) {
curRange.push(line);
}
}
else {
// end the range and output
const contextSize = Math.min(lines.length, context);
for (const line of contextLines(lines.slice(0, contextSize))) {
curRange.push(line);
}
const hunk = {
oldStart: oldRangeStart,
oldLines: (oldLine - oldRangeStart + contextSize),
newStart: newRangeStart,
newLines: (newLine - newRangeStart + contextSize),
lines: curRange
};
hunks.push(hunk);
oldRangeStart = 0;
newRangeStart = 0;
curRange = [];
}
}
oldLine += lines.length;
newLine += lines.length;
}
}
// Step 2: eliminate the trailing `\n` from each line of each hunk, and, where needed, add
// "\ No newline at end of file".
for (const hunk of hunks) {
for (let i = 0; i < hunk.lines.length; i++) {
if (hunk.lines[i].endsWith('\n')) {
hunk.lines[i] = hunk.lines[i].slice(0, -1);
}
else {
hunk.lines.splice(i + 1, 0, '\\ No newline at end of file');
i++; // Skip the line we just added, then continue iterating
}
}
}
return {
oldFileName: oldFileName, newFileName: newFileName,
oldHeader: oldHeader, newHeader: newHeader,
hunks: hunks
};
}
}
/**
* creates a unified diff patch.
* @param patch either a single structured patch object (as returned by `structuredPatch`) or an array of them (as returned by `parsePatch`)
*/
function formatPatch(patch) {
if (Array.isArray(patch)) {
return patch.map(formatPatch).join('\n');
}
const ret = [];
if (patch.oldFileName == patch.newFileName) {
ret.push('Index: ' + patch.oldFileName);
}
ret.push('===================================================================');
ret.push('--- ' + patch.oldFileName + (typeof patch.oldHeader === 'undefined' ? '' : '\t' + patch.oldHeader));
ret.push('+++ ' + patch.newFileName + (typeof patch.newHeader === 'undefined' ? '' : '\t' + patch.newHeader));
for (let i = 0; i < patch.hunks.length; i++) {
const hunk = patch.hunks[i];
// Unified Diff Format quirk: If the chunk size is 0,
// the first number is one lower than one would expect.
// https://www.artima.com/weblogs/viewpost.jsp?thread=164293
if (hunk.oldLines === 0) {
hunk.oldStart -= 1;
}
if (hunk.newLines === 0) {
hunk.newStart -= 1;
}
ret.push('@@ -' + hunk.oldStart + ',' + hunk.oldLines
+ ' +' + hunk.newStart + ',' + hunk.newLines
+ ' @@');
for (const line of hunk.lines) {
ret.push(line);
}
}
return ret.join('\n') + '\n';
}
function createTwoFilesPatch(oldFileName, newFileName, oldStr, newStr, oldHeader, newHeader, options) {
if (typeof options === 'function') {
options = { callback: options };
}
if (!(options === null || options === void 0 ? void 0 : options.callback)) {
const patchObj = structuredPatch(oldFileName, newFileName, oldStr, newStr, oldHeader, newHeader, options);
if (!patchObj) {
return;
}
return formatPatch(patchObj);
}
else {
const { callback } = options;
structuredPatch(oldFileName, newFileName, oldStr, newStr, oldHeader, newHeader, Object.assign(Object.assign({}, options), { callback: patchObj => {
if (!patchObj) {
callback(undefined);
}
else {
callback(formatPatch(patchObj));
}
} }));
}
}
function createPatch(fileName, oldStr, newStr, oldHeader, newHeader, options) {
return createTwoFilesPatch(fileName, fileName, oldStr, newStr, oldHeader, newHeader, options);
}
/**
* Split `text` into an array of lines, including the trailing newline character (where present)
*/
function splitLines(text) {
const hasTrailingNl = text.endsWith('\n');
const result = text.split('\n').map(line => line + '\n');
if (hasTrailingNl) {
result.pop();
}
else {
result.push(result.pop().slice(0, -1));
}
return result;
}
/**
* converts a list of change objects to the format returned by Google's [diff-match-patch](https://github.com/google/diff-match-patch) library
*/
function convertChangesToDMP(changes) {
const ret = [];
let change, operation;
for (let i = 0; i < changes.length; i++) {
change = changes[i];
if (change.added) {
operation = 1;
}
else if (change.removed) {
operation = -1;
}
else {
operation = 0;
}
ret.push([operation, change.value]);
}
return ret;
}
/**
* converts a list of change objects to a serialized XML format
*/
function convertChangesToXML(changes) {
const ret = [];
for (let i = 0; i < changes.length; i++) {
const change = changes[i];
if (change.added) {
ret.push('<ins>');
}
else if (change.removed) {
ret.push('<del>');
}
ret.push(escapeHTML(change.value));
if (change.added) {
ret.push('</ins>');
}
else if (change.removed) {
ret.push('</del>');
}
}
return ret.join('');
}
function escapeHTML(s) {
let n = s;
n = n.replace(/&/g, '&');
n = n.replace(/</g, '<');
n = n.replace(/>/g, '>');
n = n.replace(/"/g, '"');
return n;
}
exports.Diff = Diff;
exports.applyPatch = applyPatch;
exports.applyPatches = applyPatches;
exports.arrayDiff = arrayDiff;
exports.canonicalize = canonicalize;
exports.characterDiff = characterDiff;
exports.convertChangesToDMP = convertChangesToDMP;
exports.convertChangesToXML = convertChangesToXML;
exports.createPatch = createPatch;
exports.createTwoFilesPatch = createTwoFilesPatch;
exports.cssDiff = cssDiff;
exports.diffArrays = diffArrays;
exports.diffChars = diffChars;
exports.diffCss = diffCss;
exports.diffJson = diffJson;
exports.diffLines = diffLines;
exports.diffSentences = diffSentences;
exports.diffTrimmedLines = diffTrimmedLines;
exports.diffWords = diffWords;
exports.diffWordsWithSpace = diffWordsWithSpace;
exports.formatPatch = formatPatch;
exports.jsonDiff = jsonDiff;
exports.lineDiff = lineDiff;
exports.parsePatch = parsePatch;
exports.reversePatch = reversePatch;
exports.sentenceDiff = sentenceDiff;
exports.structuredPatch = structuredPatch;
exports.wordDiff = wordDiff;
exports.wordsWithSpaceDiff = wordsWithSpaceDiff;
}));
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