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export const enum LINE_PATCH_OP_TYPE {
/**
* The whole line is deleted. Delete the current src line and advance the src
* counter.
*/
DEL = -1,
/**
* Lines are equal in src and dst. Keep the line in src and advance, both, src
* and dst counters.
*/
EQL = 0,
/**
* The whole line is inserted. Insert the current dst line and advance the dst
* counter.
*/
INS = 1,
/**
* The line is modified. Execute inner diff between the current src and dst
* lines. Keep the line in src and advance the src and dst counters.
*/
MIX = 2,
}
export type LinePatchOp = [
type: LINE_PATCH_OP_TYPE,
/**
* Assignment of this operation to the line in the `src` array.
*/
src: number,
/**
* Assignment of this operation to the line in the `dst` array.
*/
dst: number,
/**
* Character-level patch.
*/
patch: str.Patch,
];
export type LinePatch = LinePatchOp[];
/**
* Aggregate character-by-character patch into a line-by-line patch.
*
* @param patch Character-level patch
* @returns Line-level patch
*/
export const agg = (patch: str.Patch): str.Patch[] => {
// console.log(patch);
const lines: str.Patch[] = [];
const length = patch.length;
let line: str.Patch = [];
const push = (type: str.PATCH_OP_TYPE, str: string) => {
if (!str.length) return;
const length = line.length;
if (length) {
const lastOp = line[length - 1];
Iif (lastOp[0] === type) {
lastOp[1] += str;
return;
}
}
line.push([type, str]);
};
// console.log("PATCH", patch);
LINES: for (let i = 0; i < length; i++) {
const op = patch[i];
const type = op[0];
const str = op[1];
const index = str.indexOf('\n');
if (index < 0) {
push(type, str);
continue LINES;
} else {
push(type, str.slice(0, index + 1));
if (line.length) lines.push(line);
line = [];
}
let prevIndex = index;
const strLen = str.length;
LINE: while (prevIndex < strLen) {
const nextIndex = str.indexOf('\n', prevIndex + 1);
if (nextIndex < 0) {
push(type, str.slice(prevIndex + 1));
break LINE;
}
lines.push([[type, str.slice(prevIndex + 1, nextIndex + 1)]]);
prevIndex = nextIndex;
}
}
Iif (line.length) lines.push(line);
// console.log("LINES", lines);
{
const length = lines.length;
for (let i = 0; i < length; i++) {
const line = lines[i];
let lineLength = line.length;
NORMALIZE_LINE_START: {
if (lineLength < 2) break NORMALIZE_LINE_START;
const firstOp = line[0];
const secondOp = line[1];
const secondOpType = secondOp[0];
if (
firstOp[0] === str.PATCH_OP_TYPE.EQL &&
(secondOpType === str.PATCH_OP_TYPE.DEL || secondOpType === str.PATCH_OP_TYPE.INS)
) {
for (let j = 2; j < lineLength; j++) if (line[j][0] !== secondOpType) break NORMALIZE_LINE_START;
for (let j = i + 1; j < length; j++) {
const targetLine = lines[j];
const targetLineLength = targetLine.length;
const pfx = firstOp[1];
let targetLineFirstOp: str.PatchOperation;
let targetLineSecondOp: str.PatchOperation;
if (
targetLine.length > 1 &&
(targetLineFirstOp = targetLine[0])[0] === secondOpType &&
(targetLineSecondOp = targetLine[1])[0] === str.PATCH_OP_TYPE.EQL &&
pfx === targetLineFirstOp[1]
) {
line.splice(0, 1);
secondOp[1] = pfx + secondOp[1];
targetLineSecondOp[1] = pfx + targetLineSecondOp[1];
targetLine.splice(0, 1);
} else {
for (let k = 0; k < targetLineLength; k++)
if (targetLine[k][0] !== secondOpType) break NORMALIZE_LINE_START;
}
}
}
}
lineLength = line.length;
NORMALIZE_LINE_END: {
if (lineLength < 2) break NORMALIZE_LINE_END;
const lastOp = line[line.length - 1];
const lastOpStr = lastOp[1];
const secondLastOp = line[line.length - 2];
if (lastOp[0] === str.PATCH_OP_TYPE.DEL) {
// if (lastOp[0] === PATCH_OP_TYPE.DELETE && secondLastOp[0] === PATCH_OP_TYPE.EQUAL) {
for (let j = i + 1; j < length; j++) {
const targetLine = lines[j];
const targetLineLength = targetLine.length;
if (targetLineLength <= 1) {
if (targetLine[0][0] !== str.PATCH_OP_TYPE.DEL) break NORMALIZE_LINE_END;
} else {
const targetLineLastOp = targetLine[targetLine.length - 1];
if (targetLineLastOp[0] !== str.PATCH_OP_TYPE.EQL) break NORMALIZE_LINE_END;
for (let k = 0; k < targetLine.length - 1; k++)
if (targetLine[k][0] !== str.PATCH_OP_TYPE.DEL) break NORMALIZE_LINE_END;
let keepStr = targetLineLastOp[1];
const keepStrEndsWithNl = keepStr.endsWith('\n');
Iif (!keepStrEndsWithNl) keepStr += '\n';
Iif (keepStr.length > lastOpStr.length) break NORMALIZE_LINE_END;
Iif (!lastOpStr.endsWith(keepStr)) break NORMALIZE_LINE_END;
const index = lastOpStr.length - keepStr.length;
Iif (index < 0) {
(lastOp[0] as str.PATCH_OP_TYPE) = str.PATCH_OP_TYPE.EQL;
Iif (secondLastOp[0] === str.PATCH_OP_TYPE.EQL) {
secondLastOp[1] += lastOpStr;
line.splice(lineLength - 1, 1);
}
} else if (index === 0) {
line.splice(lineLength - 1, 1);
if (secondLastOp[0] === str.PATCH_OP_TYPE.EQL) {
secondLastOp[1] += keepStr;
} else E{
line.push([str.PATCH_OP_TYPE.EQL, keepStr]);
}
} else {
lastOp[1] = lastOpStr.slice(0, index);
line.push([str.PATCH_OP_TYPE.EQL, keepStr]);
}
const targetLineSecondLastOp = targetLine[targetLine.length - 2];
if (targetLineSecondLastOp[0] === str.PATCH_OP_TYPE.DEL) {
targetLineSecondLastOp[1] += keepStrEndsWithNl ? keepStr : keepStr.slice(0, -1);
targetLine.splice(targetLineLength - 1, 1);
} else E{
(targetLineLastOp[0] as str.PATCH_OP_TYPE) = str.PATCH_OP_TYPE.DEL;
}
}
}
}
}
}
}
// console.log("NORMALIZED LINES", lines);
return lines;
};
export const diff = (src: string[], dst: string[]): LinePatch => {
const srcTxt = src.join('\n') + '\n';
const dstTxt = dst.join('\n') + '\n';
if (srcTxt === dstTxt) return [];
const strPatch = str.diff(srcTxt, dstTxt);
const lines = agg(strPatch);
const length = lines.length;
const patch: LinePatch = [];
let srcIdx = -1;
let dstIdx = -1;
const srcLength = src.length;
const dstLength = dst.length;
for (let i = 0; i < length; i++) {
const line = lines[i];
let lineLength = line.length;
Iif (!lineLength) continue;
const lastOp = line[lineLength - 1];
const lastOpType = lastOp[0];
const txt = lastOp[1];
if (txt === '\n') line.splice(lineLength - 1, 1);
else {
const strLength = txt.length;
if (txt[strLength - 1] === '\n') {
Iif (strLength === 1) line.splice(lineLength - 1, 1);
else lastOp[1] = txt.slice(0, strLength - 1);
}
}
let lineType: LINE_PATCH_OP_TYPE = LINE_PATCH_OP_TYPE.EQL;
lineLength = line.length;
if (i + 1 === length) {
if (srcIdx + 1 < srcLength) {
if (dstIdx + 1 < dstLength) {
lineType =
lineLength === 1 && line[0][0] === str.PATCH_OP_TYPE.EQL ? LINE_PATCH_OP_TYPE.EQL : LINE_PATCH_OP_TYPE.MIX;
srcIdx++;
dstIdx++;
} else {
lineType = LINE_PATCH_OP_TYPE.DEL;
srcIdx++;
}
} else {
lineType = LINE_PATCH_OP_TYPE.INS;
dstIdx++;
}
} else {
const op = line[0];
const type = op[0];
if (lineLength === 1 && type === lastOpType && type === str.PATCH_OP_TYPE.EQL) {
srcIdx++;
dstIdx++;
} else if (lastOpType === str.PATCH_OP_TYPE.EQL) {
lineType = LINE_PATCH_OP_TYPE.MIX;
srcIdx++;
dstIdx++;
} else if (lastOpType === str.PATCH_OP_TYPE.INS) {
lineType = LINE_PATCH_OP_TYPE.INS;
dstIdx++;
} else if (lastOpType === str.PATCH_OP_TYPE.DEL) {
lineType = LINE_PATCH_OP_TYPE.DEL;
srcIdx++;
}
}
patch.push([lineType, srcIdx, dstIdx, line]);
}
return patch;
};
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