33 lines
791 B
JavaScript
33 lines
791 B
JavaScript
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/**
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* Copyright 2004-present Facebook. All Rights Reserved.
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*
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* @providesModule truncate
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*/
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'use strict';
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var merge = require('merge');
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var defaultOptions = {
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breakOnWords: true,
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minDelta: 10, // Prevents truncating a tiny bit off the end
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elipsis: '...',
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};
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// maxChars (including elipsis)
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var truncate = function(str, maxChars, options) {
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options = merge(defaultOptions, options);
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if (str && str.length &&
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str.length - options.minDelta + options.elipsis.length >= maxChars) {
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str = str.slice(0, maxChars - options.elipsis.length + 1);
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if (options.breakOnWords) {
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var ii = Math.max(str.lastIndexOf(' '), str.lastIndexOf('\n'));
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str = str.slice(0, ii);
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}
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str = str.trim() + options.elipsis;
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}
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return str;
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};
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module.exports = truncate;
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