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42 lines
1.6 KiB
42 lines
1.6 KiB
var baseRepeat = require('./_baseRepeat'),
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stringSize = require('./_stringSize'),
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stringToArray = require('./_stringToArray');
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/** Used to compose unicode character classes. */
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var rsAstralRange = '\\ud800-\\udfff',
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rsComboMarksRange = '\\u0300-\\u036f\\ufe20-\\ufe23',
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rsComboSymbolsRange = '\\u20d0-\\u20f0',
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rsVarRange = '\\ufe0e\\ufe0f';
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/** Used to compose unicode capture groups. */
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var rsZWJ = '\\u200d';
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/** Used to detect strings with [zero-width joiners or code points from the astral planes](http://eev.ee/blog/2015/09/12/dark-corners-of-unicode/). */
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var reHasComplexSymbol = RegExp('[' + rsZWJ + rsAstralRange + rsComboMarksRange + rsComboSymbolsRange + rsVarRange + ']');
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/* Built-in method references for those with the same name as other `lodash` methods. */
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var nativeCeil = Math.ceil;
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/**
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* Creates the padding for `string` based on `length`. The `chars` string
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* is truncated if the number of characters exceeds `length`.
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*
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* @private
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* @param {number} length The padding length.
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* @param {string} [chars=' '] The string used as padding.
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* @returns {string} Returns the padding for `string`.
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*/
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function createPadding(length, chars) {
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chars = chars === undefined ? ' ' : (chars + '');
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var charsLength = chars.length;
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if (charsLength < 2) {
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return charsLength ? baseRepeat(chars, length) : chars;
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}
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var result = baseRepeat(chars, nativeCeil(length / stringSize(chars)));
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return reHasComplexSymbol.test(chars)
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? stringToArray(result).slice(0, length).join('')
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: result.slice(0, length);
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}
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module.exports = createPadding;
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