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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 27386x 27384x 5488x 5488x 21896x 21896x 21896x 15355x 8882x 7807x 4523x 6473x 15355x 6541x 4666x 6541x 3x 13070x 9572x 3498x 3x 5477x 3x 3357x 3350x 3350x 3350x 3x 2141x 2141x 8161x 2141x 2141x 3x 6104x 4238x 1866x 1866x | 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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