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DEL = -1,
EQL = 0,
INS = 1,
}
export type Patch = PatchOperation[];
export type PatchOperation = PatchOperationDelete | PatchOperationEqual | PatchOperationInsert;
export type PatchOperationDelete = [type: PATCH_OP_TYPE.DEL, txt: string];
export type PatchOperationEqual = [type: PATCH_OP_TYPE.EQL, txt: string];
export type PatchOperationInsert = [type: PATCH_OP_TYPE.INS, txt: string];
const startsWithPairEnd = (str: string) => {
const code = str.charCodeAt(0);
return code >= 0xdc00 && code <= 0xdfff;
};
const endsWithPairStart = (str: string): boolean => {
const code = str.charCodeAt(str.length - 1);
return code >= 0xd800 && code <= 0xdbff;
};
/**
* Reorder and merge like edit sections. Merge equalities.
* Any edit section can move as long as it doesn't cross an equality.
*
* @param diff Array of diff tuples.
* @param fixUnicode Whether to normalize to a unicode-correct diff
*/
const cleanupMerge = (diff: Patch, fixUnicode: boolean) => {
diff.push([PATCH_OP_TYPE.EQL, '']);
let pointer = 0;
let delCnt = 0;
let insCnt = 0;
let delTxt = '';
let insTxt = '';
let commonLength: number = 0;
while (pointer < diff.length) {
if (pointer < diff.length - 1 && !diff[pointer][1]) {
diff.splice(pointer, 1);
continue;
}
const d1 = diff[pointer];
switch (d1[0]) {
case PATCH_OP_TYPE.INS:
insCnt++;
pointer++;
insTxt += d1[1];
break;
case PATCH_OP_TYPE.DEL:
delCnt++;
pointer++;
delTxt += d1[1];
break;
case PATCH_OP_TYPE.EQL: {
let prevEq = pointer - insCnt - delCnt - 1;
if (fixUnicode) {
// prevent splitting of unicode surrogate pairs. When `fixUnicode` is true,
// we assume that the old and new text in the diff are complete and correct
// unicode-encoded JS strings, but the tuple boundaries may fall between
// surrogate pairs. We fix this by shaving off stray surrogates from the end
// of the previous equality and the beginning of this equality. This may create
// empty equalities or a common prefix or suffix. For example, if AB and AC are
// emojis, `[[0, 'A'], [-1, 'BA'], [0, 'C']]` would turn into deleting 'ABAC' and
// inserting 'AC', and then the common suffix 'AC' will be eliminated. in this
// particular case, both equalities go away, we absorb any previous inequalities,
// and we keep scanning for the next equality before rewriting the tuples.
const d = diff[prevEq];
if (prevEq >= 0) {
let str = d[1];
if (endsWithPairStart(str)) {
const stray = str.slice(-1);
d[1] = str = str.slice(0, -1);
delTxt = stray + delTxt;
insTxt = stray + insTxt;
if (!str) {
// emptied out previous equality, so delete it and include previous delete/insert
diff.splice(prevEq, 1);
pointer--;
let k = prevEq - 1;
const dk = diff[k];
if (dk) {
const type = dk[0];
if (type === PATCH_OP_TYPE.INS) {
insCnt++;
k--;
insTxt = dk[1] + insTxt;
} else if (type === PATCH_OP_TYPE.DEL) {
delCnt++;
k--;
delTxt = dk[1] + delTxt;
}
}
prevEq = k;
}
}
}
const d1 = diff[pointer];
const str1 = d1[1];
if (startsWithPairEnd(str1)) {
const stray = str1.charAt(0);
d1[1] = str1.slice(1);
delTxt += stray;
insTxt += stray;
}
}
Iif (pointer < diff.length - 1 && !diff[pointer][1]) {
// for empty equality not at end, wait for next equality
diff.splice(pointer, 1);
break;
}
const hasDelTxt = delTxt.length > 0;
const hasInsTxt = insTxt.length > 0;
if (hasDelTxt || hasInsTxt) {
// note that diff_commonPrefix and diff_commonSuffix are unicode-aware
if (hasDelTxt && hasInsTxt) {
// Factor out any common prefixes.
commonLength = pfx(insTxt, delTxt);
Iif (commonLength !== 0) {
if (prevEq >= 0) {
diff[prevEq][1] += insTxt.slice(0, commonLength);
} else {
diff.splice(0, 0, [PATCH_OP_TYPE.EQL, insTxt.slice(0, commonLength)]);
pointer++;
}
insTxt = insTxt.slice(commonLength);
delTxt = delTxt.slice(commonLength);
}
// Factor out any common suffixes.
commonLength = sfx(insTxt, delTxt);
if (commonLength !== 0) {
diff[pointer][1] = insTxt.slice(insTxt.length - commonLength) + diff[pointer][1];
insTxt = insTxt.slice(0, insTxt.length - commonLength);
delTxt = delTxt.slice(0, delTxt.length - commonLength);
}
}
// Delete the offending records and add the merged ones.
const n = insCnt + delCnt;
const delTxtLen = delTxt.length;
const insTxtLen = insTxt.length;
Iif (delTxtLen === 0 && insTxtLen === 0) {
diff.splice(pointer - n, n);
pointer = pointer - n;
} else if (delTxtLen === 0) {
diff.splice(pointer - n, n, [PATCH_OP_TYPE.INS, insTxt]);
pointer = pointer - n + 1;
} else if (insTxtLen === 0) {
diff.splice(pointer - n, n, [PATCH_OP_TYPE.DEL, delTxt]);
pointer = pointer - n + 1;
} else {
diff.splice(pointer - n, n, [PATCH_OP_TYPE.DEL, delTxt], [PATCH_OP_TYPE.INS, insTxt]);
pointer = pointer - n + 2;
}
}
const d0 = diff[pointer - 1];
if (pointer !== 0 && d0[0] === PATCH_OP_TYPE.EQL) {
// Merge this equality with the previous one.
d0[1] += diff[pointer][1];
diff.splice(pointer, 1);
} else pointer++;
insCnt = 0;
delCnt = 0;
delTxt = '';
insTxt = '';
break;
}
}
}
if (diff[diff.length - 1][1] === '') diff.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
let changes = false;
pointer = 1;
// Intentionally ignore the first and last element (don't need checking).
while (pointer < diff.length - 1) {
const d0 = diff[pointer - 1];
const d2 = diff[pointer + 1];
if (d0[0] === PATCH_OP_TYPE.EQL && d2[0] === PATCH_OP_TYPE.EQL) {
// This is a single edit surrounded by equalities.
const str0 = d0[1];
const d1 = diff[pointer];
const str1 = d1[1];
const str2 = d2[1];
if (str1.slice(str1.length - str0.length) === str0) {
// Shift the edit over the previous equality.
diff[pointer][1] = str0 + str1.slice(0, str1.length - str0.length);
d2[1] = str0 + str2;
diff.splice(pointer - 1, 1);
changes = true;
} else if (str1.slice(0, str2.length) === str2) {
// Shift the edit over the next equality.
d0[1] += d2[1];
d1[1] = str1.slice(str2.length) + str2;
diff.splice(pointer + 1, 1);
changes = true;
}
}
pointer++;
}
// If shifts were made, the diff needs reordering and another shift sweep.
if (changes) cleanupMerge(diff, fixUnicode);
};
/**
* Given the location of the 'middle snake', split the diff in two parts
* and recurse.
*
* @param text1 Old string to be diffed.
* @param text2 New string to be diffed.
* @param x Index of split point in text1.
* @param y Index of split point in text2.
* @return Array of diff tuples.
*/
const bisectSplit = (text1: string, text2: string, x: number, y: number): Patch => {
const diffsA = diff_(text1.slice(0, x), text2.slice(0, y), false);
const diffsB = diff_(text1.slice(x), text2.slice(y), false);
return diffsA.concat(diffsB);
};
/**
* Find the 'middle snake' of a diff, split the problem in two
* and return the recursively constructed diff.
*
* This is a port of `diff-patch-match` implementation to TypeScript.
*
* @see http://www.xmailserver.org/diff2.pdf EUGENE W. MYERS 1986 paper: An
* O(ND) Difference Algorithm and Its Variations.
*
* @param text1 Old string to be diffed.
* @param text2 New string to be diffed.
* @return A {@link Patch} - an array of patch operations.
*/
const bisect = (text1: string, text2: string): Patch => {
const text1Length = text1.length;
const text2Length = text2.length;
const maxD = Math.ceil((text1Length + text2Length) / 2);
const vOffset = maxD;
const vLength = 2 * maxD;
const v1 = new Array(vLength);
const v2 = new Array(vLength);
for (let x = 0; x < vLength; x++) {
v1[x] = -1;
v2[x] = -1;
}
v1[vOffset + 1] = 0;
v2[vOffset + 1] = 0;
const delta = text1Length - text2Length;
// If the total number of characters is odd, then the front path will collide
// with the reverse path.
const front = delta % 2 !== 0;
// Offsets for start and end of k loop.
// Prevents mapping of space beyond the grid.
let k1start = 0;
let k1end = 0;
let k2start = 0;
let k2end = 0;
for (let d = 0; d < maxD; d++) {
for (let k1 = -d + k1start; k1 <= d - k1end; k1 += 2) {
const k1_offset = vOffset + k1;
let x1: number = 0;
const v10 = v1[k1_offset - 1];
const v11 = v1[k1_offset + 1];
if (k1 === -d || (k1 !== d && v10 < v11)) x1 = v11;
else x1 = v10 + 1;
let y1 = x1 - k1;
while (x1 < text1Length && y1 < text2Length && text1.charAt(x1) === text2.charAt(y1)) {
x1++;
y1++;
}
v1[k1_offset] = x1;
if (x1 > text1Length) k1end += 2;
else if (y1 > text2Length) k1start += 2;
else if (front) {
const k2Offset = vOffset + delta - k1;
const v2Offset = v2[k2Offset];
if (k2Offset >= 0 && k2Offset < vLength && v2Offset !== -1) {
if (x1 >= text1Length - v2Offset) return bisectSplit(text1, text2, x1, y1);
}
}
}
// Walk the reverse path one step.
for (let k2 = -d + k2start; k2 <= d - k2end; k2 += 2) {
const k2_offset = vOffset + k2;
let x2 =
k2 === -d || (k2 !== d && v2[k2_offset - 1] < v2[k2_offset + 1]) ? v2[k2_offset + 1] : v2[k2_offset - 1] + 1;
let y2 = x2 - k2;
while (
x2 < text1Length &&
y2 < text2Length &&
text1.charAt(text1Length - x2 - 1) === text2.charAt(text2Length - y2 - 1)
) {
x2++;
y2++;
}
v2[k2_offset] = x2;
if (x2 > text1Length) k2end += 2;
else if (y2 > text2Length) k2start += 2;
else if (!front) {
const k1_offset = vOffset + delta - k2;
const x1 = v1[k1_offset];
if (k1_offset >= 0 && k1_offset < vLength && x1 !== -1) {
const y1 = vOffset + x1 - k1_offset;
x2 = text1Length - x2;
if (x1 >= x2) return bisectSplit(text1, text2, x1, y1);
}
}
}
}
return [
[PATCH_OP_TYPE.DEL, text1],
[PATCH_OP_TYPE.INS, text2],
];
};
/**
* Find the differences between two texts. Assumes that the texts do not
* have any common prefix or suffix.
*
* @param src Old string to be diffed.
* @param dst New string to be diffed.
* @return A {@link Patch} - an array of patch operations.
*/
const diffNoCommonAffix = (src: string, dst: string): Patch => {
if (!src) return [[PATCH_OP_TYPE.INS, dst]];
if (!dst) return [[PATCH_OP_TYPE.DEL, src]];
const text1Length = src.length;
const text2Length = dst.length;
const long = text1Length > text2Length ? src : dst;
const short = text1Length > text2Length ? dst : src;
const shortTextLength = short.length;
const indexOfContainedShort = long.indexOf(short);
if (indexOfContainedShort >= 0) {
const start = long.slice(0, indexOfContainedShort);
const end = long.slice(indexOfContainedShort + shortTextLength);
return text1Length > text2Length
? [
[PATCH_OP_TYPE.DEL, start],
[PATCH_OP_TYPE.EQL, short],
[PATCH_OP_TYPE.DEL, end],
]
: [
[PATCH_OP_TYPE.INS, start],
[PATCH_OP_TYPE.EQL, short],
[PATCH_OP_TYPE.INS, end],
];
}
if (shortTextLength === 1)
return [
[PATCH_OP_TYPE.DEL, src],
[PATCH_OP_TYPE.INS, dst],
];
return bisect(src, dst);
};
/**
* Determine the common prefix of two strings.
*
* @param txt1 First string.
* @param txt2 Second string.
* @return The number of characters common to the start of each string.
*/
export const pfx = (txt1: string, txt2: string) => {
if (!txt1 || !txt2 || txt1.charAt(0) !== txt2.charAt(0)) return 0;
let min = 0;
let max = Math.min(txt1.length, txt2.length);
let mid = max;
let start = 0;
while (min < mid) {
if (txt1.slice(start, mid) === txt2.slice(start, mid)) {
min = mid;
start = min;
} else max = mid;
mid = Math.floor((max - min) / 2 + min);
}
const code = txt1.charCodeAt(mid - 1);
const isSurrogatePairStart = code >= 0xd800 && code <= 0xdbff;
if (isSurrogatePairStart) mid--;
return mid;
};
/**
* Determine the common suffix of two strings.
*
* @param txt1 First string.
* @param txt2 Second string.
* @return The number of characters common to the end of each string.
*/
export const sfx = (txt1: string, txt2: string): number => {
if (!txt1 || !txt2 || txt1.slice(-1) !== txt2.slice(-1)) return 0;
let min = 0;
let max = Math.min(txt1.length, txt2.length);
let mid = max;
let end = 0;
while (min < mid) {
if (txt1.slice(txt1.length - mid, txt1.length - end) === txt2.slice(txt2.length - mid, txt2.length - end)) {
min = mid;
end = min;
} else max = mid;
mid = Math.floor((max - min) / 2 + min);
}
const code = txt1.charCodeAt(txt1.length - mid);
const isSurrogatePairEnd = code >= 0xd800 && code <= 0xdbff;
if (isSurrogatePairEnd) mid--;
return mid;
};
/**
* Find the differences between two texts. Simplifies the problem by stripping
* any common prefix or suffix off the texts before diffing.
*
* @param src Old string to be diffed.
* @param dst New string to be diffed.
* @param cleanup Whether to apply semantic cleanup before returning.
* @return A {@link Patch} - an array of patch operations.
*/
const diff_ = (src: string, dst: string, fixUnicode: boolean): Patch => {
if (src === dst) return src ? [[PATCH_OP_TYPE.EQL, src]] : [];
// Trim off common prefix (speedup).
const prefixLength = pfx(src, dst);
const prefix = src.slice(0, prefixLength);
src = src.slice(prefixLength);
dst = dst.slice(prefixLength);
// Trim off common suffix (speedup).
const suffixLength = sfx(src, dst);
const suffix = src.slice(src.length - suffixLength);
src = src.slice(0, src.length - suffixLength);
dst = dst.slice(0, dst.length - suffixLength);
// Compute the diff on the middle block.
const diff: Patch = diffNoCommonAffix(src, dst);
if (prefix) diff.unshift([PATCH_OP_TYPE.EQL, prefix]);
if (suffix) diff.push([PATCH_OP_TYPE.EQL, suffix]);
cleanupMerge(diff, fixUnicode);
return diff;
};
/**
* Find the differences between two texts.
*
* @param src Old string to be diffed.
* @param dst New string to be diffed.
* @return A {@link Patch} - an array of patch operations.
*/
export const diff = (src: string, dst: string): Patch => diff_(src, dst, true);
/**
* Considers simple insertion and deletion cases around the caret position in
* the destination string. If the fast patch cannot be constructed, it falls
* back to the default full implementation.
*
* Cases considered:
*
* 1. Insertion of a single or multiple characters right before the caret.
* 2. Deletion of one or more characters right before the caret.
*
* @param src Old string to be diffed.
* @param dst New string to be diffed.
* @param caret The position of the caret in the new string. Set to -1 to
* ignore the caret position.
* @return A {@link Patch} - an array of patch operations.
*/
export const diffEdit = (src: string, dst: string, caret: number) => {
edit: {
Iif (caret < 0) break edit;
const srcLen = src.length;
const dstLen = dst.length;
if (srcLen === dstLen) break edit;
const dstSfx = dst.slice(caret);
const sfxLen = dstSfx.length;
if (sfxLen > srcLen) break edit;
const srcSfx = src.slice(srcLen - sfxLen);
if (srcSfx !== dstSfx) break edit;
const isInsert = dstLen > srcLen;
if (isInsert) {
const pfxLen = srcLen - sfxLen;
const srcPfx = src.slice(0, pfxLen);
const dstPfx = dst.slice(0, pfxLen);
if (srcPfx !== dstPfx) break edit;
const insert = dst.slice(pfxLen, caret);
const patch: Patch = [];
if (srcPfx) patch.push([PATCH_OP_TYPE.EQL, srcPfx]);
if (insert) patch.push([PATCH_OP_TYPE.INS, insert]);
if (dstSfx) patch.push([PATCH_OP_TYPE.EQL, dstSfx]);
return patch;
} else {
const pfxLen = dstLen - sfxLen;
const dstPfx = dst.slice(0, pfxLen);
const srcPfx = src.slice(0, pfxLen);
if (srcPfx !== dstPfx) break edit;
const del = src.slice(pfxLen, srcLen - sfxLen);
const patch: Patch = [];
if (srcPfx) patch.push([PATCH_OP_TYPE.EQL, srcPfx]);
if (del) patch.push([PATCH_OP_TYPE.DEL, del]);
if (dstSfx) patch.push([PATCH_OP_TYPE.EQL, dstSfx]);
return patch;
}
}
return diff(src, dst);
};
export const src = (patch: Patch): string => {
let txt = '';
const length = patch.length;
for (let i = 0; i < length; i++) {
const op = patch[i];
if (op[0] !== PATCH_OP_TYPE.INS) txt += op[1];
}
return txt;
};
export const dst = (patch: Patch): string => {
let txt = '';
const length = patch.length;
for (let i = 0; i < length; i++) {
const op = patch[i];
if (op[0] !== PATCH_OP_TYPE.DEL) txt += op[1];
}
return txt;
};
const invertOp = (op: PatchOperation): PatchOperation => {
const type = op[0];
return type === PATCH_OP_TYPE.EQL
? op
: type === PATCH_OP_TYPE.INS
? [PATCH_OP_TYPE.DEL, op[1]]
: [PATCH_OP_TYPE.INS, op[1]];
};
/**
* Inverts patch such that it can be applied to `dst` to get `src` (instead of
* `src` to get `dst`).
*
* @param patch The patch to invert.
* @returns Inverted patch.
*/
export const invert = (patch: Patch): Patch => patch.map(invertOp);
/**
* @param patch The patch to apply.
* @param srcLen The length of the source string.
* @param onInsert Callback for insert operations.
* @param onDelete Callback for delete operations.
*/
export const apply = (
patch: Patch,
srcLen: number,
onInsert: (pos: number, str: string) => void,
onDelete: (pos: number, len: number, str: string) => void,
) => {
const length = patch.length;
let pos = srcLen;
for (let i = length - 1; i >= 0; i--) {
const [type, str] = patch[i];
if (type === PATCH_OP_TYPE.EQL) pos -= str.length;
else if (type === PATCH_OP_TYPE.INS) onInsert(pos, str);
else {
const len = str.length;
pos -= len;
onDelete(pos, len, str);
}
}
};
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