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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 27522x 27520x 5503x 5503x 22017x 22017x 22017x 15610x 9104x 8081x 4436x 6506x 15610x 6407x 4558x 6407x 3x 13506x 10072x 3434x 3x 5786x 3x 3365x 3357x 3357x 3357x 3x 2149x 2149x 8132x 2149x 2149x 3x 6242x 4420x 1822x 1822x | 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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