typia/lib/internal/_randomPattern.js

Superfast runtime validators with only one line

"use strict";
var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports._randomPattern = void 0;
const randexp_1 = __importDefault(require("randexp"));
const _randomPattern = (regex, props) => {
    const r = new randexp_1.default(regex);
    const min = props === null || props === void 0 ? void 0 : props.minLength;
    const max = props === null || props === void 0 ? void 0 : props.maxLength;
    // RandExp expands an unbounded quantifier to `randInt(token.min, token.min +
    // r.max)`, so steering `r.max` biases the generated length toward the window.
    // There is no matching floor control, so the length is still verified below.
    if (max !== undefined)
        r.max = max;
    else if (min !== undefined && min * 2 > r.max)
        r.max = min * 2;
    const bounded = min !== undefined || max !== undefined;
    const limit = bounded ? 1024 : 10;
    for (let i = 0; i < limit; ++i) {
        const str = r.gen();
        if (regex.test(str) &&
            (min === undefined || str.length >= min) &&
            (max === undefined || str.length <= max))
            return str;
    }
    throw new Error(bounded
        ? "unable to generate a random string matching the pattern within the length range."
        : "unable to generate a random string matching the pattern.");
};
exports._randomPattern = _randomPattern;
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