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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 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 | 5x 27562x 27560x 5525x 5525x 22035x 22035x 22035x 15511x 9121x 8016x 4583x 6390x 6524x 6524x 1826x 1826x 1826x 1826x 4698x 5x 13392x 5x 5660x 5x 3420x 3367x 3367x 3367x 5x 2204x 2204x 8212x 2204x 2204x 5x 6236x 4437x 1799x 1799x 1799x | import type {BinaryOp, BinaryOpComponent} from './types';
export const append = (op: BinaryOp, component: BinaryOpComponent): void => {
if (!component) return;
if (!op.length) {
op.push(component);
return;
}
const lastIndex = op.length - 1;
const last = op[lastIndex];
if (typeof component === 'number') {
if (typeof last === 'number') {
if (component > 0 && last > 0) op[lastIndex] = last + component;
else if (component < 0 && last < 0) op[lastIndex] = last + component;
else op.push(component);
} else op.push(component);
} else if (component instanceof Uint8Array) {
if (last instanceof Uint8Array) {
const combined = new Uint8Array(last.length + component.length);
combined.set(last, 0);
combined.set(component, last.length);
op[lastIndex] = combined;
} else op.push(component);
}
};
export const componentLength = (component: BinaryOpComponent): number => {
return typeof component === 'number' ? Math.abs(component) : component.length;
};
export const isDeleteComponent = (component: BinaryOpComponent): boolean => {
return typeof component === 'number' && component < 0;
};
export const trim = (op: BinaryOp): void => {
if (!op.length) return;
const last = op[op.length - 1];
const isLastRetain = typeof last === 'number' && last > 0;
if (isLastRetain) op.pop();
};
export const normalize = (op: BinaryOp): BinaryOp => {
const op2: BinaryOp = [];
const length = op.length;
for (let i = 0; i < length; i++) append(op2, op[i]);
trim(op2);
return op2;
};
/**
* Extracts a full or a part of a component from an operation.
*
* @param component Component from which to extract a chunk.
* @param offset Position within the component to start from.
* @param maxLength Maximum length of the component to extract.
* @returns Full or partial component at index `index` of operation `op`.
*/
export const chunk = (component: BinaryOpComponent, offset: number, maxLength: number): BinaryOpComponent => {
if (typeof component === 'number') {
return component > 0 ? Math.min(component - offset, maxLength) : -Math.min(-component - offset, maxLength);
} else if (component instanceof Uint8Array) {
const end = Math.min(offset + maxLength, component.length);
return component.subarray(offset, end);
}
return component;
};
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