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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 | 1x 1x 11x 3x 3x 1x 1x 2x 8x 8x 8x 8x 8x 8x 4x 4x 2x 2x 4x 2x 2x 2x 2x 1x 1x | import {type Op, OpStrDel, OpStrIns} from '../../json-patch/op';
export const xStrDel = (del: OpStrDel, op: Op): null | Op | Op[] => {
if (op instanceof OpStrIns) {
const ins = op;
if (ins.pos > del.pos) {
const deleteLength = del.deleteLength();
return new OpStrIns(ins.path, op.pos - deleteLength, op.str);
}
return op;
}
if (op instanceof OpStrDel) {
const opLen = op.deleteLength();
const delLen = del.deleteLength();
const overlapLen1 = del.pos + delLen - op.pos;
const overlapLen2 = op.pos + opLen - del.pos;
if (del.pos <= op.pos && overlapLen1 > 0) {
const newLen = opLen - overlapLen1;
if (newLen <= 0) return null;
if (typeof op.str === 'string')
return new OpStrDel(op.path, op.pos - (delLen - overlapLen1), op.str.substr(overlapLen1), undefined);
else Ereturn new OpStrDel(op.path, op.pos, undefined, newLen);
} else if (del.pos >= op.pos && overlapLen2 > 0) {
const newLen = del.pos - op.pos + Math.max(0, overlapLen2 - delLen);
Iif (newLen <= 0) return null;
if (typeof op.str === 'string') return new OpStrDel(op.path, op.pos, op.str.substr(0, newLen), undefined);
else Ereturn new OpStrDel(op.path, op.pos, undefined, newLen);
} else if (del.pos < op.pos) {
if (typeof op.str === 'string') return new OpStrDel(op.path, op.pos - delLen, op.str, undefined);
else Ereturn new OpStrDel(op.path, op.pos - delLen, undefined, op.len);
}
return op;
}
return op;
};
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