54 lines
945 B
JavaScript
54 lines
945 B
JavaScript
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export class Packer {
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constructor() {
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this._keyCaret = 0;
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this._keys = {};
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}
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pack(steps) {
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const newKeys = {};
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const packedSteps = steps.map((step) => {
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const {op, path, value} = step;
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if (!this._keys[path]) {
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this._keys[path] = newKeys[path] = this._keyCaret++;
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}
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return {
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op,
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path: this._keys[path],
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value,
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}
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});
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const payload = {
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steps: packedSteps,
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};
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if (0 !== Object.keys(newKeys).length) {
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payload.newKeys = newKeys;
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}
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return payload;
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}
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}
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export class Unpacker {
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constructor() {
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this._keys = {};
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}
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unpack(payload) {
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const {newKeys, steps} = payload;
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for (const key in newKeys) {
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this._keys[newKeys[key]] = key;
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}
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return steps.map((step) => {
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const {op, path, value} = step;
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return {
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op,
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path: this._keys[path],
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value,
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};
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});
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}
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}
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