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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 28185x 28183x 5487x 5487x 22696x 22696x 22696x 15759x 9125x 8090x 4522x 6634x 6937x 6937x 2063x 2063x 2063x 2063x 4874x 5x 14056x 5x 5829x 5x 3420x 3349x 3349x 3349x 5x 2204x 2204x 8306x 2204x 2204x 5x 6545x 4579x 1966x 1966x 1966x | 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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