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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 | 3x 3x 3x 3x 3x 3x 3x 13x 13x 13x 26x 26x 15x 14x 13x 10x 10x 3x 3x 13x 11x 7x 7x 6x 19x 6x 6x 3x | import type {StringOp, StringOpComponent} from './types';
export enum VALIDATE_RESULT {
SUCCESS = 0,
INVALID_OP = 1,
INVALID_COMPONENT = 2,
ADJACENT_SAME_TYPE = 3,
NO_TRAILING_RETAIN = 4,
}
export const validate = (op: StringOp): VALIDATE_RESULT => {
Iif (!(op instanceof Array)) return VALIDATE_RESULT.INVALID_OP;
Iif (op.length === 0) return VALIDATE_RESULT.INVALID_OP;
let last: StringOpComponent | undefined;
for (let i = 0; i < op.length; i++) {
const component = op[i];
switch (typeof component) {
case 'number': {
if (!component) return VALIDATE_RESULT.INVALID_COMPONENT;
if (component !== Math.round(component)) return VALIDATE_RESULT.INVALID_COMPONENT;
if (component > 0) {
const lastComponentIsRetain = typeof last === 'number' && last > 0;
Iif (lastComponentIsRetain) return VALIDATE_RESULT.ADJACENT_SAME_TYPE;
} else {
const lastComponentIsDelete = typeof last === 'number' && last < 0;
Iif (lastComponentIsDelete) return VALIDATE_RESULT.ADJACENT_SAME_TYPE;
}
break;
}
case 'string': {
if (!component.length) return VALIDATE_RESULT.INVALID_COMPONENT;
const lastComponentIsInsert = typeof last === 'string';
if (lastComponentIsInsert) return VALIDATE_RESULT.ADJACENT_SAME_TYPE;
break;
}
default:
return VALIDATE_RESULT.INVALID_COMPONENT;
}
last = component;
}
const isLastRetain = typeof last === 'number' && last > 0;
if (isLastRetain) return VALIDATE_RESULT.NO_TRAILING_RETAIN;
return VALIDATE_RESULT.SUCCESS;
};
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