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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 68 69 70 71 72 73 74 75 | 3x 27636x 27634x 5527x 5527x 22107x 22107x 22107x 15597x 9106x 8075x 4619x 6491x 15597x 6510x 4628x 6510x 3x 13426x 9962x 3464x 3x 5656x 3x 3377x 3369x 3369x 3369x 3x 2161x 2161x 8218x 2161x 2161x 3x 6268x 4427x 1841x 1841x | import type {StringOp, StringOpComponent} from './types';
export const append = (op: StringOp, component: StringOpComponent): void => {
if (!component) return;
if (!op.length) {
op.push(component);
return;
}
const lastIndex = op.length - 1;
const last = op[lastIndex];
switch (typeof component) {
case '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);
break;
}
case 'string': {
if (typeof last === 'string') op[lastIndex] = last + component;
else op.push(component);
break;
}
}
};
export const componentLength = (component: StringOpComponent): number => {
switch (typeof component) {
case 'number':
return Math.abs(component);
case 'string':
return component.length;
}
};
export const isDeleteComponent = (component: StringOpComponent): boolean => {
return typeof component === 'number' && component < 0;
};
export const trim = (op: StringOp): 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: StringOp): StringOp => {
const op2: StringOp = [];
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: StringOpComponent, offset: number, maxLength: number): StringOpComponent => {
switch (typeof component) {
case 'number': {
return component > 0 ? Math.min(component - offset, maxLength) : -Math.min(-component - offset, maxLength);
}
case 'string': {
const end = Math.min(offset + maxLength, component.length);
return component.substring(offset, end);
}
}
};
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