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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 28495x 28493x 5511x 5511x 22982x 22982x 22982x 16147x 9432x 8381x 4714x 6715x 6835x 6835x 1989x 1989x 1989x 1989x 4846x 5x 13944x 5x 5876x 5x 3420x 3364x 3364x 3364x 5x 2204x 2204x 8457x 2204x 2204x 5x 6512x 4549x 1963x 1963x 1963x | 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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