@orchidjs/unicode-variants/dist/esm/regex.js

Unicode variant string matching

/**
 * Convert array of strings to a regular expression
 *	ex ['ab','a'] => (?:ab|a)
 * 	ex ['a','b'] => [ab]
 */
export const arrayToPattern = (chars) => {
    chars = chars.filter(Boolean);
    if (chars.length < 2) {
        return chars[0] || '';
    }
    return (maxValueLength(chars) == 1) ? '[' + chars.join('') + ']' : '(?:' + chars.join('|') + ')';
};
export const sequencePattern = (array) => {
    if (!hasDuplicates(array)) {
        return array.join('');
    }
    let pattern = '';
    let prev_char_count = 0;
    const prev_pattern = () => {
        if (prev_char_count > 1) {
            pattern += '{' + prev_char_count + '}';
        }
    };
    array.forEach((char, i) => {
        if (char === array[i - 1]) {
            prev_char_count++;
            return;
        }
        prev_pattern();
        pattern += char;
        prev_char_count = 1;
    });
    prev_pattern();
    return pattern;
};
/**
 * Convert array of strings to a regular expression
 *	ex ['ab','a'] => (?:ab|a)
 * 	ex ['a','b'] => [ab]
 */
export const setToPattern = (chars) => {
    let array = Array.from(chars);
    return arrayToPattern(array);
};
/**
 * https://stackoverflow.com/questions/7376598/in-javascript-how-do-i-check-if-an-array-has-duplicate-values
 */
export const hasDuplicates = (array) => {
    return (new Set(array)).size !== array.length;
};
/**
 * https://stackoverflow.com/questions/63006601/why-does-u-throw-an-invalid-escape-error
 */
export const escape_regex = (str) => {
    return (str + '').replace(/([\$\(\)\*\+\.\?\[\]\^\{\|\}\\])/gu, '\\$1');
};
/**
 * Return the max length of array values
 */
export const maxValueLength = (array) => {
    return array.reduce((longest, value) => Math.max(longest, unicodeLength(value)), 0);
};
export const unicodeLength = (str) => {
    return Array.from(str).length;
};
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