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124 lines
3.5 KiB
TypeScript
124 lines
3.5 KiB
TypeScript
// Loaded from https://deno.land/x/segno@v1.1.0/lib/validations/isCurrency.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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type CurrencyOptions = {
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symbol?: string;
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requireSymbol?: boolean;
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allowSpaceAfterSymbol?: boolean;
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symbolAfterDigits?: boolean;
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allowNegatives?: boolean;
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parensForNegatives?: boolean;
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negativeSignBeforeDigits?: boolean;
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negativeSignAfterDigits?: boolean;
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allowNegativeSignPlaceholder?: boolean;
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thousandsSeparator?: string;
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decimalSeparator?: string;
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allowDecimal?: boolean;
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requireDecimal?: boolean;
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digitsAfterDecimal?: number[];
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allowSpaceAfterDigits?: boolean;
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};
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/**
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* @ignore
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*/
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const currencyRegex = (options: Required<CurrencyOptions>) => {
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let decimalDigits = `\\d{${options.digitsAfterDecimal[0]}}`;
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options.digitsAfterDecimal.forEach((digit, index) => {
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if (index !== 0) decimalDigits = `${decimalDigits}|\\d{${digit}}`;
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});
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const symbol = `(${options.symbol.replace(/\W/, (m) => `\\${m}`)})${
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options.requireSymbol ? '' : '?'
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}`,
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negative = '-?',
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whole_dollar_amount_without_sep = '[1-9]\\d*',
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whole_dollar_amount_with_sep = `[1-9]\\d{0,2}(\\${options.thousandsSeparator}\\d{3})*`,
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valid_whole_dollar_amounts = [
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'0',
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whole_dollar_amount_without_sep,
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whole_dollar_amount_with_sep,
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],
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whole_dollar_amount = `(${valid_whole_dollar_amounts.join('|')})?`,
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decimal_amount = `(\\${options.decimalSeparator}(${decimalDigits}))${
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options.requireDecimal ? '' : '?'
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}`;
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let pattern =
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whole_dollar_amount +
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(options.allowDecimal || options.requireDecimal ? decimal_amount : '');
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// default is negative sign before symbol, but there are two other options (besides parens)
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if (options.allowNegatives && !options.parensForNegatives) {
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if (options.negativeSignAfterDigits) {
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pattern += negative;
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} else if (options.negativeSignBeforeDigits) {
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pattern = negative + pattern;
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}
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}
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// South African Rand, for example, uses R 123 (space) and R-123 (no space)
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if (options.allowNegativeSignPlaceholder) {
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pattern = `( (?!\\-))?${pattern}`;
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} else if (options.allowSpaceAfterSymbol) {
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pattern = ` ?${pattern}`;
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} else if (options.allowSpaceAfterDigits) {
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pattern += '( (?!$))?';
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}
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if (options.symbolAfterDigits) {
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pattern += symbol;
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} else {
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pattern = symbol + pattern;
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}
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if (options.allowNegatives) {
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if (options.parensForNegatives) {
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pattern = `(\\(${pattern}\\)|${pattern})`;
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} else if (
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!(options.negativeSignBeforeDigits || options.negativeSignAfterDigits)
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) {
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pattern = negative + pattern;
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}
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}
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// ensure there's a dollar and/or decimal amount, and that
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// it doesn't start with a space or a negative sign followed by a space
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return new RegExp(`^(?!-? )(?=.*\\d)${pattern}$`);
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};
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/**
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* @ignore
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*/
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const defaultCurrencyOptions: CurrencyOptions = {
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symbol: '$',
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requireSymbol: false,
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allowSpaceAfterSymbol: false,
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symbolAfterDigits: false,
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allowNegatives: true,
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parensForNegatives: false,
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negativeSignBeforeDigits: false,
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negativeSignAfterDigits: false,
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allowNegativeSignPlaceholder: false,
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thousandsSeparator: ',',
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decimalSeparator: '.',
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allowDecimal: true,
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requireDecimal: false,
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digitsAfterDecimal: [2],
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allowSpaceAfterDigits: false,
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};
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export const isCurrency = (str: string, options?: CurrencyOptions) => {
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assertString(str);
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options = {
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...defaultCurrencyOptions,
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...options,
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};
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return currencyRegex(options as Required<CurrencyOptions>).test(str);
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};
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