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42 lines
1.0 KiB
TypeScript
42 lines
1.0 KiB
TypeScript
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// Loaded from https://deno.land/x/segno@v1.1.0/lib/validations/isFloat.ts
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// @ts-ignore allowing typedoc to build
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import { assertString } from '../helpers/assertString.ts';
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// @ts-ignore allowing typedoc to build
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import { decimal } from '../helpers/alpha.ts';
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type FloatOptions = {
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locale?: string;
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min?: number;
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max?: number;
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lt?: number;
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gt?: number;
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};
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export const isFloat = (str: string, options?: FloatOptions) => {
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assertString(str);
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options = options || {};
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const float = new RegExp(
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`^(?:[-+])?(?:[0-9]+)?(?:\\${
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options.locale ? (decimal as any)[options.locale] : '.'
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}[0-9]*)?(?:[eE][\\+\\-]?(?:[0-9]+))?$`
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);
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if (str === '' || str === '.' || str === '-' || str === '+') {
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return false;
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}
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const value = parseFloat(str.replace(',', '.'));
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return (
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float.test(str) &&
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(!options.min || value >= options.min) &&
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(!options.max || value <= options?.max) &&
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(!options.lt || value < options?.lt) &&
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(!options.gt || value > options?.gt)
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);
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};
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export const decimalLocales = Object.keys(decimal);
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