45 lines
1.5 KiB
JavaScript
45 lines
1.5 KiB
JavaScript
//#region src/core/validator.ts
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const string = (value) => typeof value === "string";
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const number = (value) => typeof value === "number";
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const boolean = (value) => typeof value === "boolean";
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const bigint = (value) => typeof value === "bigint";
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/** Matches an instance of the given constructor. */
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function instanceOf(ctor) {
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return (value) => value instanceof ctor;
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}
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/** Matches when any of the given validators match. */
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function union(...validators) {
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return (value) => {
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for (let i = 0, len = validators.length; i < len; i++) if (validators[i](value)) return true;
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return false;
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};
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}
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/** Matches the given validator or `undefined`. */
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function optional(validator) {
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return (value) => value === void 0 || validator(value);
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}
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/** Matches an array whose items each match `item`. */
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function array(item) {
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return (value) => {
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if (!Array.isArray(value)) return false;
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for (let i = 0, len = value.length; i < len; i++) if (!item(value[i])) return false;
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return true;
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};
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}
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/**
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* Matches an object whose declared keys each pass their validator. Extra keys
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* are not checked.
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*/
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function object(shape) {
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const keys = Object.keys(shape);
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return (value) => {
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if (value == null || typeof value !== "object") return false;
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for (let i = 0, len = keys.length; i < len; i++) {
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const key = keys[i];
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if (!shape[key](Reflect.get(value, key))) return false;
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}
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return true;
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};
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}
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//#endregion
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export { array, bigint, boolean, instanceOf, number, object, optional, string, union };
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