"use strict";

// -----

/** Used to compose unicode character classes. */
const rsAstralRange = '\\ud800-\\udfff';
const rsComboMarksRange = '\\u0300-\\u036f';
const reComboHalfMarksRange = '\\ufe20-\\ufe2f';
const rsComboSymbolsRange = '\\u20d0-\\u20ff';
const rsVarRange = '\\ufe0e\\ufe0f';
const rsComboRange = rsComboMarksRange + reComboHalfMarksRange + rsComboSymbolsRange;
/** Used to compose unicode capture groups. */

const rsAstral = `[${rsAstralRange}]`;
const rsCombo = `[${rsComboRange}]`;
const rsFitz = '\\ud83c[\\udffb-\\udfff]';
const rsModifier = `(?:${rsCombo}|${rsFitz})`;
const rsNonAstral = `[^${rsAstralRange}]`;
const rsRegional = '(?:\\ud83c[\\udde6-\\uddff]){2}';
const rsSurrPair = '[\\ud800-\\udbff][\\udc00-\\udfff]';
const rsZWJ = '\\u200d';
/** Used to compose unicode regexes. */

const reOptMod = `${rsModifier}?`;
const rsOptVar = `[${rsVarRange}]?`;
const rsOptJoin = `(?:${rsZWJ}(?:${[rsNonAstral, rsRegional, rsSurrPair].join('|')})${rsOptVar + reOptMod})*`;
const rsSeq = rsOptVar + reOptMod + rsOptJoin;
const rsNonAstralCombo = `${rsNonAstral}${rsCombo}?`;
const rsSymbol = `(?:${[rsNonAstralCombo, rsCombo, rsRegional, rsSurrPair, rsAstral].join('|')})`;
/** Used to match [string symbols](https://mathiasbynens.be/notes/javascript-unicode). */

const reUnicode = RegExp(`${rsFitz}(?=${rsFitz})|${rsSymbol + rsSeq}`, 'g');
/**
 * Converts a Unicode `string` to an array.
 * @since 5.0.0-beta.5
 * @memberOf cast
 *
 * @param {string} string The string to convert.
 * @return {Array} Returns the converted array.
 *
 * @TODO @example
 *
 */

module.exports = function unicodeToArray(string) {
  return string.match(reUnicode) || [];
};