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var toString = require('./toString');
/** Used to match non-compound words composed of alphanumeric characters. */
var reBasicWord = /[a-zA-Z0-9]+/g;
/** Used to compose unicode character classes. */
var rsAstralRange = '\\ud800-\\udfff',
rsComboMarksRange = '\\u0300-\\u036f\\ufe20-\\ufe23',
rsComboSymbolsRange = '\\u20d0-\\u20f0',
rsDingbatRange = '\\u2700-\\u27bf',
rsLowerRange = 'a-z\\xdf-\\xf6\\xf8-\\xff',
rsMathOpRange = '\\xac\\xb1\\xd7\\xf7',
rsNonCharRange = '\\x00-\\x2f\\x3a-\\x40\\x5b-\\x60\\x7b-\\xbf',
rsQuoteRange = '\\u2018\\u2019\\u201c\\u201d',
rsSpaceRange = ' \\t\\x0b\\f\\xa0\\ufeff\\n\\r\\u2028\\u2029\\u1680\\u180e\\u2000\\u2001\\u2002\\u2003\\u2004\\u2005\\u2006\\u2007\\u2008\\u2009\\u200a\\u202f\\u205f\\u3000',
rsUpperRange = 'A-Z\\xc0-\\xd6\\xd8-\\xde',
rsVarRange = '\\ufe0e\\ufe0f',
rsBreakRange = rsMathOpRange + rsNonCharRange + rsQuoteRange + rsSpaceRange;
/** Used to compose unicode capture groups. */
var rsApos = "['\u2019]",
rsBreak = '[' + rsBreakRange + ']',
rsCombo = '[' + rsComboMarksRange + rsComboSymbolsRange + ']',
rsDigits = '\\d+',
rsDingbat = '[' + rsDingbatRange + ']',
rsLower = '[' + rsLowerRange + ']',
rsMisc = '[^' + rsAstralRange + rsBreakRange + rsDigits + rsDingbatRange + rsLowerRange + rsUpperRange + ']',
rsFitz = '\\ud83c[\\udffb-\\udfff]',
rsModifier = '(?:' + rsCombo + '|' + rsFitz + ')',
rsNonAstral = '[^' + rsAstralRange + ']',
rsRegional = '(?:\\ud83c[\\udde6-\\uddff]){2}',
rsSurrPair = '[\\ud800-\\udbff][\\udc00-\\udfff]',
rsUpper = '[' + rsUpperRange + ']',
rsZWJ = '\\u200d';
/** Used to compose unicode regexes. */
var rsLowerMisc = '(?:' + rsLower + '|' + rsMisc + ')',
rsUpperMisc = '(?:' + rsUpper + '|' + rsMisc + ')',
rsOptLowerContr = '(?:' + rsApos + '(?:d|ll|m|re|s|t|ve))?',
rsOptUpperContr = '(?:' + rsApos + '(?:D|LL|M|RE|S|T|VE))?',
reOptMod = rsModifier + '?',
rsOptVar = '[' + rsVarRange + ']?',
rsOptJoin = '(?:' + rsZWJ + '(?:' + [rsNonAstral, rsRegional, rsSurrPair].join('|') + ')' + rsOptVar + reOptMod + ')*',
rsSeq = rsOptVar + reOptMod + rsOptJoin,
rsEmoji = '(?:' + [rsDingbat, rsRegional, rsSurrPair].join('|') + ')' + rsSeq;
/** Used to match complex or compound words. */
var reComplexWord = RegExp([
rsUpper + '?' + rsLower + '+' + rsOptLowerContr + '(?=' + [rsBreak, rsUpper, '$'].join('|') + ')',
rsUpperMisc + '+' + rsOptUpperContr + '(?=' + [rsBreak, rsUpper + rsLowerMisc, '$'].join('|') + ')',
rsUpper + '?' + rsLowerMisc + '+' + rsOptLowerContr,
rsUpper + '+' + rsOptUpperContr,
rsDigits,
rsEmoji
].join('|'), 'g');
/** Used to detect strings that need a more robust regexp to match words. */
var reHasComplexWord = /[a-z][A-Z]|[A-Z]{2,}[a-z]|[0-9][a-zA-Z]|[a-zA-Z][0-9]|[^a-zA-Z0-9 ]/;
/**
* Splits `string` into an array of its words.
*
* @static
* @memberOf _
* @since 3.0.0
* @category String
* @param {string} [string=''] The string to inspect.
* @param {RegExp|string} [pattern] The pattern to match words.
* @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
* @returns {Array} Returns the words of `string`.
* @example
*
* _.words('fred, barney, & pebbles');
* // => ['fred', 'barney', 'pebbles']
*
* _.words('fred, barney, & pebbles', /[^, ]+/g);
* // => ['fred', 'barney', '&', 'pebbles']
*/
function words(string, pattern, guard) {
string = toString(string);
pattern = guard ? undefined : pattern;
if (pattern === undefined) {
pattern = reHasComplexWord.test(string) ? reComplexWord : reBasicWord;
}
return string.match(pattern) || [];
}
module.exports = words;
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